/* PizzaScience Combined Stylesheet (tokens + base + layout + components + animations) */
/* === css/tokens.css === */
/* ==========================================================================
   PizzaScience — Design Tokens
   Tiered custom-property system for colors, typography, spacing, and layout.
   ========================================================================== */

:root {
  /* Claude.ai Core Design System (High-contrast WCAG AAA compliant tokens) */
  --accent: #244a68;
  --accent-hover: #1b384f;
  --accent-light: #e3eff8;
  --bg-page: #faf9f7;
  --bg-sidebar: #f5f4f0;
  --bg-card: #ffffff;
  --text-primary: #1a1a18;
  --text-secondary: #555551;
  --border: rgba(0, 0, 0, 0.12);
  --radius-sm: 8px;
  --radius-md: 12px;
  --radius-pill: 20px;

  /* Warm Greys Literal Palette */
  --color-gray-25:  #faf9f7; /* Page bg */
  --color-gray-50:  #f5f4f0; /* Sidebar bg */
  --color-gray-100: #ecebe6;
  --color-gray-200: #e2e1dc;
  --color-gray-300: #d4d3ce; /* Border */
  --color-gray-400: #b5b4af;
  --color-gray-500: #969590;
  --color-gray-600: #7a7974;
  --color-gray-700: #555551; /* Text secondary */
  --color-gray-850: #2d2d2a;
  --color-gray-950: #1a1a18; /* Text primary */
  --color-white:    #ffffff;

  /* Typography */
  --font-sans: 'Inter', system-ui, -apple-system, sans-serif;

  --fs-display:  clamp(1.75rem, 1.5rem + 0.75vw, 2.25rem);
  --fs-h1:       clamp(1.375rem, 1.25rem + 0.5vw, 1.625rem); /* approx 22px greeting headline */
  --fs-h2:       clamp(1.125rem, 1.05rem + 0.25vw, 1.25rem);
  --fs-h3:       14px;
  --fs-body:     14px;
  --fs-body-sm:  13px; /* 13px sidebar items */
  --fs-caption:  11px;
  --fs-numeric:  clamp(1.75rem, 1.5rem + 0.5vw, 2.25rem);

  /* Extreme restraint on font weight: only 400 (regular) and 500 (medium). No bold/700 anywhere. */
  --fw-regular:  400;
  --fw-semibold: 500;
  --fw-bold:     500;
  --fw-extrabold:500;

  --lh-tight:    1.2;
  --lh-snug:     1.3;
  --lh-normal:   1.5;
  --lh-relaxed:  1.6;

  /* Letter spacing is tighter than browser defaults — around -0.01em. */
  --ls-tight:    -0.01em;
  --ls-normal:   -0.01em;
  --ls-wide:     0.01em;

  /* Spacing Scale */
  --space-2xs:  0.25rem;   /*  4px */
  --space-xs:   0.5rem;    /*  8px */
  --space-sm:   0.75rem;   /* 12px */
  --space-md:   1rem;      /* 16px */
  --space-lg:   1.5rem;    /* 24px */
  --space-xl:   2rem;      /* 32px */
  --space-2xl:  3rem;      /* 48px */
  --space-3xl:  4rem;      /* 64px */

  /* Radii */
  --radius-xs:   4px;
  --radius-sm:   var(--radius-sm);
  --radius-md:   var(--radius-md);
  --radius-lg:   var(--radius-md);
  --radius-xl:   var(--radius-md);
  --radius-full: var(--radius-pill);

  /* No shadows — elevation is conveyed through background color contrast */
  --shadow-xs:  none;
  --shadow-sm:  none;
  --shadow-md:  none;
  --shadow-lg:  none;
  --shadow-inner: none;

  /* Transitions */
  --ease-default: cubic-bezier(0.4, 0, 0.2, 1);
  --ease-in:      cubic-bezier(0.4, 0, 1, 1);
  --ease-out:     cubic-bezier(0, 0, 0.2, 1);
  --ease-bounce:  cubic-bezier(0.34, 1.56, 0.64, 1);
  --duration-fast:   100ms;
  --duration-normal: 200ms;
  --duration-slow:   400ms;

  /* Semantic Tokens */

  /* Surfaces */
  --color-bg:              var(--bg-page);
  --color-surface:         var(--bg-card);
  --color-surface-raised:  var(--bg-card);
  --color-surface-sunken:  var(--bg-sidebar);
  --color-surface-overlay: rgba(26, 26, 24, 0.4);

  /* Primary brand */
  --color-primary:         var(--accent);
  --color-primary-hover:   var(--accent-hover);
  --color-on-primary:      #ffffff;
  --color-on-primary-muted:var(--accent-light);

  /* Accent */
  --color-accent:          var(--accent);
  --color-accent-hover:    var(--accent-hover);
  --color-accent-container:var(--accent);
  --color-accent-subtle:   var(--accent-light);
  --color-on-accent:       #ffffff;

  /* Text */
  --color-text:            var(--text-primary);
  --color-text-secondary:  var(--text-secondary);
  --color-text-tertiary:   var(--text-secondary);
  --color-text-on-dark:    var(--text-primary);
  --color-text-on-dark-muted: var(--text-secondary);

  /* Borders - Hairline borders everywhere */
  --color-border:          var(--border);
  --color-border-subtle:   rgba(0, 0, 0, 0.06);
  --color-border-accent:   var(--accent);

  /* Premium */
  --color-premium:         #b8922e;
  --color-premium-subtle:  #faf3e0;
  --color-on-premium:      #1a1a18;
  --color-gold-400:        #fad02c;
  --color-gold-500:        #f1b814;
  --color-gold-600:        #c69109;

  /* Status */
  --color-error:           #ba1a1a;
  --color-success:         #2e7d32;

  /* Typography semantic */
  --font-body:             var(--font-sans);
  --font-heading:          var(--font-sans);
  --font-numeric:          var(--font-sans);

  /* Layout */
  --sidebar-width:   220px; /* ~220px */
  --header-height:   3.5rem;
  --bottom-nav-height: 3.5rem;
  --container-max:   1200px;
  --content-gap:     var(--space-md);

  /* Cards */
  --card-bg:         var(--color-surface);
  --card-border:     var(--color-border);
  --card-radius:     var(--radius-md);
  --card-padding:    var(--space-md);
  --card-shadow:     var(--shadow-md);

  /* Sliders */
  --slider-track-height:  4px;
  --slider-track-bg:      var(--color-border-subtle);
  --slider-track-fill:    var(--color-primary);
  --slider-thumb-size:    18px;
  --slider-thumb-bg:      var(--color-surface);
  --slider-thumb-border:  var(--color-primary);
  --slider-thumb-shadow:  none;

  /* Segmented Buttons */
  --seg-bg:          var(--color-surface-sunken);
  --seg-active-bg:   var(--color-surface);
  --seg-active-shadow: none;
  --seg-radius:      var(--radius-sm);

  /* Recipe Cards */
  --recipe-card-gap:    var(--space-sm);
  --recipe-flour-bg:    var(--color-primary);
  --recipe-flour-text:  var(--color-on-primary);
  --recipe-flour-label: var(--color-on-primary-muted);

  /* Timeline */
  --timeline-bulk-bg:   var(--color-primary);
  --timeline-balled-bg: var(--color-accent-subtle);
  --timeline-height:    1.5rem;
}

/* === css/base.css === */
/* ==========================================================================
   PizzaScience — Base Styles
   Modern reset, global typography, form normalization.
   ========================================================================== */

/* -----------------------------------------------------------------------
   Reset
   ----------------------------------------------------------------------- */
*,
*::before,
*::after {
  box-sizing: border-box;
  margin: 0;
  padding: 0;
}

html {
  color-scheme: light;
  -webkit-text-size-adjust: 100%;
  text-size-adjust: 100%;
  -moz-tab-size: 4;
  tab-size: 4;
  scroll-behavior: smooth;
}

body {
  min-block-size: 100dvh;
  font-family: var(--font-body);
  font-size: var(--fs-body);
  font-weight: var(--fw-regular);
  letter-spacing: var(--ls-normal);
  line-height: var(--lh-normal);
  color: var(--color-text);
  background-color: var(--color-bg);
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
  text-rendering: optimizeLegibility;
}

/* -----------------------------------------------------------------------
   Typography
   ----------------------------------------------------------------------- */
h1, h2, h3, h4, h5, h6 {
  font-family: var(--font-heading);
  font-weight: var(--fw-bold);
  line-height: var(--lh-snug);
  text-wrap: balance;
}

h1 { font-size: var(--fs-h1); letter-spacing: var(--ls-tight); }
h2 { font-size: var(--fs-h2); }
h3 { font-size: var(--fs-h3); }

p {
  text-wrap: pretty;
}

strong, b {
  font-weight: var(--fw-bold);
}

small {
  font-size: var(--fs-caption);
}

/* -----------------------------------------------------------------------
   Links
   ----------------------------------------------------------------------- */
a {
  color: var(--color-accent);
  text-decoration: none;
  transition: color var(--duration-fast) var(--ease-default);
}

a:hover {
  color: var(--color-accent-hover);
}

/* -----------------------------------------------------------------------
   Images & Media
   ----------------------------------------------------------------------- */
img, svg, video, canvas {
  display: block;
  max-inline-size: 100%;
  block-size: auto;
}

/* -----------------------------------------------------------------------
   Lists
   ----------------------------------------------------------------------- */
ul, ol {
  list-style: none;
}

/* -----------------------------------------------------------------------
   Buttons
   ----------------------------------------------------------------------- */
button {
  font: inherit;
  color: inherit;
  background: none;
  border: none;
  cursor: pointer;
  -webkit-tap-highlight-color: transparent;
}

button:focus-visible {
  outline: 2px solid var(--color-accent);
  outline-offset: 2px;
}

/* -----------------------------------------------------------------------
   Form Elements
   ----------------------------------------------------------------------- */
input, select, textarea {
  font: inherit;
  color: inherit;
}

input[type="range"] {
  -webkit-appearance: none;
  appearance: none;
  background: transparent;
  cursor: pointer;
}

/* -----------------------------------------------------------------------
   Dialog
   ----------------------------------------------------------------------- */
dialog {
  border: none;
  padding: 0;
  max-inline-size: min(90vw, 480px);
  border-radius: var(--radius-xl);
  box-shadow: var(--shadow-lg);
}

dialog::backdrop {
  background: var(--color-surface-overlay);
  backdrop-filter: blur(4px);
}

/* -----------------------------------------------------------------------
   Utilities
   ----------------------------------------------------------------------- */
.sr-only {
  position: absolute;
  inline-size: 1px;
  block-size: 1px;
  padding: 0;
  margin: -1px;
  overflow: hidden;
  clip: rect(0, 0, 0, 0);
  white-space: nowrap;
  border: 0;
}

/* Label styles */
.label-caps {
  font-size: var(--fs-caption);
  font-weight: var(--fw-semibold);
  letter-spacing: var(--ls-wide);
  text-transform: uppercase;
  color: var(--color-text-secondary);
}

/* Numeric display */
.numeric-display {
  font-family: var(--font-numeric);
  font-size: var(--fs-numeric);
  font-weight: var(--fw-bold);
  letter-spacing: var(--ls-tight);
  line-height: 1;
}

.numeric-unit {
  font-size: var(--fs-h3);
  font-weight: var(--fw-semibold);
  margin-inline-start: var(--space-2xs);
}

/* === css/layout.css === */
/* ==========================================================================
   PizzaScience — Layout
   Responsive layout: sidebar + header + main grid on desktop,
   bottom-nav + stacked content on mobile.
   ========================================================================== */

/* -----------------------------------------------------------------------
   App Shell
   ----------------------------------------------------------------------- */
.app {
  display: flex;
  min-block-size: 100dvh;
}

/* -----------------------------------------------------------------------
   Sidebar (Desktop only)
   ----------------------------------------------------------------------- */
.sidebar {
  position: fixed;
  inset-block: 0;
  inset-inline-start: 0;
  inline-size: var(--sidebar-width);
  display: none;
  flex-direction: column;
  background-color: var(--color-surface-sunken);
  border-inline-end: 1px solid var(--color-border);
  box-shadow: none;
  z-index: 50;
  padding-block: var(--space-lg);
  overflow-y: auto;
  overflow-x: hidden;
  overscroll-behavior: contain;
  transition: inline-size 0.22s ease, opacity 0.22s ease, border-inline-end-color 0.22s ease;
}

.sidebar__brand {
  padding-inline: var(--space-md);
  margin-block-end: var(--space-md);
  display: flex;
  justify-content: center;
  align-items: center;
}

.sidebar__logo-picture {
  display: flex;
  justify-content: center;
  max-inline-size: 56%;
  block-size: auto;
  transition: opacity 0.12s ease, max-inline-size 0.22s ease;
}

.sidebar__logo-img {
  max-inline-size: 100%;
  block-size: auto;
  display: block;
  transition: opacity 0.12s ease, max-inline-size 0.22s ease;
}

.sidebar__toggle-btn {
  display: none;
}

.sidebar__nav-label,
.sidebar__upgrade-label {
  display: inline-block;
  transition: opacity 0.12s ease, max-inline-size 0.22s ease;
  max-inline-size: 150px;
  overflow: hidden;
  white-space: nowrap;
  vertical-align: middle;
}

/* Nav Links */
.sidebar__nav {
  flex: 1;
  padding-inline: var(--space-xs);
}

.sidebar__nav-list {
  display: flex;
  flex-direction: column;
  gap: var(--space-2xs);
}

.sidebar__nav-link {
  display: flex;
  align-items: center;
  gap: var(--space-sm);
  padding: var(--space-sm) var(--space-md);
  border-radius: var(--radius-sm);
  color: var(--color-text-secondary);
  font-size: var(--fs-body-sm);
  transition: all var(--duration-normal) var(--ease-default);
  text-decoration: none;
}

.sidebar__nav-link:hover {
  background-color: rgba(0, 0, 0, 0.04);
  color: var(--color-text);
}

.sidebar__nav-link--active {
  background-color: rgba(0, 0, 0, 0.06);
  color: var(--color-text);
  font-weight: var(--fw-semibold);
}

.sidebar__nav-link .material-symbols-outlined {
  font-size: 1.25rem;
  flex-shrink: 0;
}

.sidebar__lock-icon {
  margin-inline-start: auto;
  font-size: 0.875rem !important;
  color: var(--color-text-secondary);
  opacity: 0.5;
}

/* Footer */
.sidebar__footer {
  margin-block-start: auto;
  padding-inline: var(--space-xs);
  display: flex;
  flex-direction: column;
  gap: var(--space-md);
}

.sidebar__upgrade-btn {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: var(--space-xs);
  margin-inline: var(--space-sm);
  padding: var(--space-sm) var(--space-md);
  background-color: var(--color-premium-subtle);
  border: 1px solid #e2c170;
  color: #b8922e;
  font-weight: var(--fw-semibold);
  font-size: var(--fs-body-sm);
  border-radius: var(--radius-sm);
  box-shadow: none;
  transition: all var(--duration-normal) var(--ease-default);
}

.sidebar__upgrade-btn:hover {
  background-color: #f5ebd0;
  border-color: var(--color-premium);
  transform: none;
}

.sidebar__secondary-nav {
  display: flex;
  flex-direction: column;
  gap: var(--space-2xs);
}

.sidebar__secondary-link {
  display: flex;
  align-items: center;
  gap: var(--space-sm);
  padding: var(--space-xs) var(--space-md);
  font-size: var(--fs-body-sm);
  color: var(--color-text-secondary);
  border-radius: var(--radius-sm);
  transition: all var(--duration-fast) var(--ease-default);
  text-decoration: none;
}

.sidebar__secondary-link:hover {
  background-color: rgba(0, 0, 0, 0.04);
  color: var(--color-text);
}

.sidebar__secondary-link .material-symbols-outlined {
  font-size: 1.25rem;
}

/* -----------------------------------------------------------------------
   Mobile Drawer Overlay (sidebar on mobile)
   ----------------------------------------------------------------------- */
.drawer-overlay {
  display: none;
  position: fixed;
  inset: 0;
  background: var(--color-surface-overlay);
  z-index: 45;
  opacity: 0;
  transition: opacity var(--duration-slow) var(--ease-default);
}

.drawer-overlay--visible {
  display: block;
  opacity: 1;
}

/* -----------------------------------------------------------------------
   Main Content Area
   ----------------------------------------------------------------------- */
.main-wrapper {
  flex: 1;
  display: flex;
  flex-direction: column;
  min-block-size: 100dvh;
}

/* -----------------------------------------------------------------------
   Top Header Bar
   ----------------------------------------------------------------------- */
.header {
  position: sticky;
  inset-block-start: 0;
  z-index: 40;
  display: flex;
  align-items: center;
  justify-content: space-between;
  block-size: var(--header-height);
  padding-inline: var(--space-md);
  background-color: var(--color-surface);
  border-block-end: 1px solid var(--color-border);
}

.header__left {
  display: flex;
  align-items: center;
  gap: var(--space-md);
}

.header__menu-btn {
  display: flex;
  align-items: center;
  justify-content: center;
  min-block-size: 44px;
  min-inline-size: 44px;
  border-radius: var(--radius-md);
  color: var(--color-text);
  transition: background-color var(--duration-fast) var(--ease-default);
}

.header__menu-btn:hover {
  background-color: var(--color-surface-sunken);
}

.header__brand-mobile {
  font-size: var(--fs-h3);
  font-weight: var(--fw-extrabold);
  color: var(--color-text);
  letter-spacing: var(--ls-tight);
}

.header__toggles {
  display: flex;
  gap: var(--space-sm);
}

.header__toggle-btn {
  font-size: var(--fs-caption);
  font-weight: var(--fw-semibold);
  letter-spacing: var(--ls-wide);
  text-transform: uppercase;
  padding-block-end: var(--space-2xs);
  color: var(--color-text-secondary);
  transition: color var(--duration-fast) var(--ease-default);
  border-block-end: 2px solid transparent;
}

.header__toggle-btn:hover {
  color: var(--color-accent);
}

.header__toggle-btn--active {
  color: var(--color-text);
  font-weight: var(--fw-bold);
  border-block-end-color: var(--color-accent);
}

.header__right {
  display: flex;
  align-items: center;
  gap: var(--space-sm);
}

.header__unit-btn {
  display: flex;
  align-items: center;
  gap: var(--space-2xs);
  padding: var(--space-2xs) var(--space-sm);
  font-size: var(--fs-body-sm);
  font-weight: var(--fw-semibold);
  color: var(--color-text-secondary);
  background-color: var(--color-surface-sunken);
  border-radius: var(--radius-full);
  transition: all var(--duration-fast) var(--ease-default);
}

.header__unit-btn:hover {
  background-color: var(--color-gray-200);
  color: var(--color-text);
}

.header__unit-btn--active {
  background-color: var(--color-primary);
  color: var(--color-on-primary);
}

.header__icon-btn {
  display: flex;
  align-items: center;
  justify-content: center;
  min-block-size: 40px;
  min-inline-size: 40px;
  border-radius: var(--radius-md);
  color: var(--color-text-secondary);
  transition: all var(--duration-fast) var(--ease-default);
}

.header__icon-btn:hover {
  background-color: var(--color-surface-sunken);
  color: var(--color-accent);
}

/* -----------------------------------------------------------------------
   Calculator Grid (Main Content)
   ----------------------------------------------------------------------- */
.calculator {
  flex: 1;
  padding: var(--space-md);
  overflow-y: auto;
}

.calculator__grid {
  max-inline-size: var(--container-max);
  margin-inline: auto;
  display: grid;
  grid-template-columns: 1fr;
  gap: var(--content-gap);
}

.calculator__inputs {
  order: 2;
}

.calculator__outputs {
  order: 1;
}

.calculator__section-title {
  font-size: var(--fs-h1);
  font-weight: var(--fw-bold);
  color: var(--color-text);
  margin-block-end: var(--space-lg);
}

/* -----------------------------------------------------------------------
   Bottom Navigation (Mobile only)
   ----------------------------------------------------------------------- */
.bottom-nav {
  position: fixed;
  inset-inline: 0;
  inset-block-end: 0;
  z-index: 40;
  display: flex;
  align-items: stretch;
  block-size: var(--bottom-nav-height);
  background-color: var(--color-surface);
  border-block-start: 1px solid var(--color-border);
  box-shadow: 0 -2px 8px rgb(0 0 0 / 0.06);
  padding-block-end: env(safe-area-inset-bottom, 0);
}

.bottom-nav__item {
  flex: 1;
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  gap: var(--space-2xs);
  font-size: 0.625rem;
  font-weight: var(--fw-semibold);
  letter-spacing: var(--ls-wide);
  color: var(--color-text-tertiary);
  text-decoration: none;
  transition: color var(--duration-fast) var(--ease-default);
  position: relative;
}

.bottom-nav__item:hover {
  color: var(--color-accent);
}

.bottom-nav__item--active {
  color: var(--color-text);
}

.bottom-nav__item--active::before {
  content: '';
  position: absolute;
  inset-block-start: 0;
  inline-size: 2rem;
  block-size: 3px;
  background-color: var(--color-accent);
  border-radius: 0 0 var(--radius-sm) var(--radius-sm);
}

.bottom-nav__item .material-symbols-outlined,
.bottom-nav__item .bottom-nav__icon {
  font-size: 1.375rem;
  inline-size: 1.375rem;
  block-size: 1.375rem;
}

/* -----------------------------------------------------------------------
   Desktop Breakpoint (≥768px)
   ----------------------------------------------------------------------- */
@media (min-width: 768px) {
  .sidebar {
    display: flex;
  }

  .sidebar__brand {
    flex-direction: column;
    align-items: flex-start;
    gap: var(--space-sm);
  }

  .sidebar__logo-picture,
  .sidebar__logo-img {
    align-self: center;
  }

  .sidebar__toggle-btn {
    display: flex;
    align-items: center;
    justify-content: center;
    background: transparent;
    border: none;
    cursor: pointer;
    color: var(--color-text-secondary);
    padding: var(--space-2xs);
    border-radius: var(--radius-sm);
    transition: background-color var(--duration-fast), color var(--duration-fast);
    align-self: flex-end;
  }

  .sidebar__toggle-btn:hover {
    background-color: rgba(0, 0, 0, 0.04);
    color: var(--color-text);
  }

  .main-wrapper {
    margin-inline-start: var(--sidebar-width);
    transition: margin-inline-start 0.22s ease;
  }

  .header__menu-btn,
  .header__brand-mobile {
    display: none;
  }

  /* Collapsed states */
  .app--sidebar-collapsed .sidebar {
    inline-size: 48px;
  }

  .app--sidebar-collapsed .sidebar__logo-picture,
  .app--sidebar-collapsed .sidebar__logo-img {
    opacity: 0;
    max-inline-size: 0;
    pointer-events: none;
  }

  .app--sidebar-collapsed .sidebar__brand {
    justify-content: center;
    align-items: center;
    padding-inline: 0;
  }

  .app--sidebar-collapsed .sidebar__toggle-btn {
    align-self: center;
  }

  .app--sidebar-collapsed .sidebar__nav-label,
  .app--sidebar-collapsed .sidebar__upgrade-label {
    opacity: 0;
    max-inline-size: 0;
    pointer-events: none;
  }

  .app--sidebar-collapsed .sidebar__lock-icon {
    display: none !important;
  }

  .app--sidebar-collapsed .sidebar__nav-link {
    justify-content: center;
    padding-inline: 0;
    gap: 0;
  }

  .app--sidebar-collapsed .sidebar__secondary-link {
    justify-content: center;
    padding-inline: 0;
    gap: 0;
  }

  .app--sidebar-collapsed .sidebar__upgrade-btn {
    margin-inline: 0;
    padding-inline: 0;
    border-color: transparent;
    background: transparent;
    justify-content: center;
  }

  .app--sidebar-collapsed .main-wrapper {
    margin-inline-start: 48px;
  }

  .app--sidebar-collapsed .header__brand-mobile {
    display: block;
  }

  .header__toggles {
    gap: var(--space-lg);
  }

  .header {
    display: none;
  }

  .calculator {
    padding: var(--space-xl);
  }

  .bottom-nav {
    display: none;
  }

  /* Add bottom padding space that the bottom nav would have occupied */
  .calculator {
    padding-block-end: var(--space-xl);
  }
}

/* -----------------------------------------------------------------------
   Large Desktop (≥1024px) — two-column calculator
   ----------------------------------------------------------------------- */
@media (min-width: 1024px) {
  .calculator__grid {
    grid-template-columns: 7fr 5fr;
  }
  .calculator__inputs {
    order: 1;
  }
  .calculator__outputs {
    order: 2;
  }
}

/* -----------------------------------------------------------------------
   Mobile — account for bottom nav
   ----------------------------------------------------------------------- */
@media (max-width: 767px) {
  .calculator {
    padding-block-end: calc(var(--bottom-nav-height) + var(--space-lg) + env(safe-area-inset-bottom, 0));
  }

  /* Mobile drawer sidebar behavior */
  .sidebar--mobile-open {
    display: flex;
    animation: slideInFromLeft var(--duration-slow) var(--ease-out);
  }
}

@keyframes slideInFromLeft {
  from { transform: translateX(-100%); }
  to   { transform: translateX(0); }
}

/* === css/components.css === */
/* ==========================================================================
   PizzaScience — Components
   Cards, sliders, segmented controls, recipe output, timeline, premium locks.
   ========================================================================== */

/* -----------------------------------------------------------------------
   Input Card
   ----------------------------------------------------------------------- */
.input-card {
  background-color: var(--card-bg);
  border: 1px solid var(--card-border);
  border-radius: var(--card-radius);
  padding: var(--card-padding);
  box-shadow: var(--card-shadow);
}

.input-card__title {
  font-size: var(--fs-h3);
  font-weight: var(--fw-semibold);
  color: var(--color-text);
  margin-block-end: var(--space-md);
}

.input-card__row {
  display: flex;
  align-items: center;
  justify-content: space-between;
  margin-block-end: var(--space-xs);
}

.input-card__row:has(.value-tag),
.input-card__row:has(.hydration-tag) {
  align-items: flex-start;
}

.input-card__value {
  font-size: var(--fs-body-sm);
  font-weight: var(--fw-bold);
  color: var(--color-text);
}

.input-card__range-labels {
  display: flex;
  justify-content: space-between;
  margin-block-start: var(--space-2xs);
  font-size: var(--fs-caption);
  color: var(--color-text-secondary);
}

.input-card__group {
  display: flex;
  flex-direction: column;
  gap: var(--space-lg);
}

/* Two-column sub-grid for Salt & Fat */
.input-card--split {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: var(--space-md);
}

@media (min-width: 641px) {
  .input-card--split .input-card__row {
    align-items: flex-start;
    min-height: 52px;
  }
}

@media (max-width: 640px) {
  .input-card--split {
    grid-template-columns: 1fr;
  }
}

/* -----------------------------------------------------------------------
   Custom Range Slider
   ----------------------------------------------------------------------- */
.slider {
  -webkit-appearance: none;
  appearance: none;
  inline-size: 100%;
  block-size: var(--slider-thumb-size);
  background: transparent;
  outline: none;
  margin-block: var(--space-xs);
  cursor: pointer;
}

/* Webkit Track */
.slider::-webkit-slider-runnable-track {
  inline-size: 100%;
  block-size: var(--slider-track-height);
  border-radius: var(--radius-full);
  background-color: var(--slider-track-bg, #dcdee1);
  background-image: linear-gradient(
    to right,
    var(--slider-track-fill, #131b2e) var(--progress, 0%),
    transparent var(--progress, 0%)
  );
  border: none;
}

/* Webkit Thumb */
.slider::-webkit-slider-thumb {
  -webkit-appearance: none;
  appearance: none;
  inline-size: var(--slider-thumb-size);
  block-size: var(--slider-thumb-size);
  border-radius: 50%;
  background: var(--slider-thumb-bg);
  border: 2px solid var(--slider-thumb-border);
  box-shadow: var(--slider-thumb-shadow);
  margin-block-start: calc((var(--slider-track-height) - var(--slider-thumb-size)) / 2);
  cursor: pointer;
  transition: transform var(--duration-fast) var(--ease-bounce),
              border-color var(--duration-fast) var(--ease-default),
              box-shadow var(--duration-fast) var(--ease-default);
}

.slider::-webkit-slider-thumb:hover {
  transform: scale(1.1);
  border-color: var(--color-accent);
}

.slider:active::-webkit-slider-thumb {
  transform: scale(1.2);
  border-color: var(--color-accent);
  box-shadow: 0 0 0 4px var(--color-accent-subtle);
}

.slider:focus-visible::-webkit-slider-thumb {
  border-color: var(--color-accent);
  box-shadow: 0 0 0 4px var(--color-accent-subtle);
}

/* Firefox Thumb */
.slider::-moz-range-thumb {
  inline-size: var(--slider-thumb-size);
  block-size: var(--slider-thumb-size);
  border-radius: 50%;
  background: var(--slider-thumb-bg);
  border: 2px solid var(--slider-thumb-border);
  box-shadow: var(--slider-thumb-shadow);
  cursor: pointer;
  transition: transform var(--duration-fast) var(--ease-bounce),
              border-color var(--duration-fast) var(--ease-default);
}

.slider::-moz-range-thumb:hover {
  transform: scale(1.1);
  border-color: var(--color-accent);
}

.slider:active::-moz-range-thumb {
  transform: scale(1.2);
  border-color: var(--color-accent);
}

.slider:focus-visible::-moz-range-thumb {
  border-color: var(--color-accent);
  box-shadow: 0 0 0 4px var(--color-accent-subtle);
}

/* Firefox Track */
.slider::-moz-range-track {
  block-size: var(--slider-track-height);
  border-radius: var(--radius-full);
  background-color: var(--slider-track-bg, #dcdee1);
  background-image: linear-gradient(
    to right,
    var(--slider-track-fill, #131b2e) var(--progress, 0%),
    transparent var(--progress, 0%)
  );
  border: none;
}

.slider::-moz-range-progress {
  block-size: var(--slider-track-height);
  border-radius: var(--radius-full);
  background: transparent;
  border: none;
}

/* -----------------------------------------------------------------------
   Segmented Control
   ----------------------------------------------------------------------- */
.segmented {
  display: flex;
  background-color: var(--seg-bg);
  border-radius: var(--seg-radius);
  padding: 3px;
  gap: 2px;
}

.segmented__btn {
  flex: 1;
  display: flex;
  align-items: center;
  justify-content: center;
  padding: var(--space-xs) var(--space-sm);
  font-size: var(--fs-body-sm);
  font-weight: var(--fw-regular);
  color: var(--color-text-secondary);
  border-radius: calc(var(--seg-radius) - 2px);
  transition: all var(--duration-normal) var(--ease-default);
  min-block-size: 40px;
}

.segmented__btn:hover:not(.segmented__btn--active) {
  background-color: var(--color-gray-200);
  color: var(--color-text);
}

.segmented__btn--active {
  background-color: var(--seg-active-bg);
  color: var(--color-text);
  font-weight: var(--fw-bold);
  box-shadow: var(--seg-active-shadow);
  border: 1px solid var(--color-border);
}

/* -----------------------------------------------------------------------
   Hydration Tag
   ----------------------------------------------------------------------- */
.hydration-tag,
.value-tag {
  display: inline-flex;
  align-items: center;
  padding: var(--space-2xs) var(--space-sm);
  font-size: var(--fs-body-sm);
  font-weight: var(--fw-bold);
  border-radius: var(--radius-full);
  background-color: var(--color-accent-subtle);
  color: var(--color-accent-container);
  transition: all var(--duration-normal) var(--ease-default);
  white-space: nowrap;
}

/* -----------------------------------------------------------------------
   Recipe Weight Cards (Bento Grid)
   ----------------------------------------------------------------------- */
.recipe-grid {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: var(--recipe-card-gap);
}

.recipe-card {
  position: relative;
  padding: var(--space-md) var(--space-lg);
  border-radius: var(--card-radius);
  overflow: hidden;
}

.recipe-card__icon {
  position: absolute;
  inset-block-start: var(--space-sm);
  inset-inline-end: var(--space-sm);
  font-size: 2rem;
  opacity: 0.12;
  pointer-events: none;
}

.recipe-card__label {
  font-size: var(--fs-caption);
  font-weight: var(--fw-semibold);
  letter-spacing: var(--ls-wide);
  text-transform: uppercase;
  margin-block-end: var(--space-2xs);
}

.recipe-card__value {
  font-family: var(--font-numeric);
  font-size: var(--fs-numeric);
  font-weight: var(--fw-bold);
  letter-spacing: var(--ls-tight);
  line-height: 1;
}

.recipe-card__unit {
  font-size: var(--fs-h3);
  font-weight: var(--fw-semibold);
  margin-inline-start: var(--space-2xs);
}

/* Flour card — dark variant */
.recipe-card--flour {
  background-color: var(--recipe-flour-bg);
  color: var(--recipe-flour-text);
  border: 1px solid var(--color-navy-700);
  box-shadow: var(--shadow-md);
}

.recipe-card--flour .recipe-card__label {
  color: var(--recipe-flour-label);
}

.recipe-card--flour .recipe-card__icon {
  color: var(--color-text-on-dark);
}

/* Light cards */
.recipe-card--light {
  background-color: var(--card-bg);
  color: var(--color-text);
  border: 1px solid var(--card-border);
  box-shadow: var(--card-shadow);
}

.recipe-card--light .recipe-card__label {
  color: var(--color-text-secondary);
}

/* -----------------------------------------------------------------------
   Fermentation Timeline
   ----------------------------------------------------------------------- */
.timeline {
  background-color: var(--card-bg);
  border: 1px solid var(--card-border);
  border-radius: var(--card-radius);
  padding: var(--card-padding);
  box-shadow: var(--card-shadow);
}

.timeline__title {
  font-size: var(--fs-h3);
  font-weight: var(--fw-semibold);
  color: var(--color-text);
  margin-block-end: var(--space-md);
}

.timeline__bar {
  display: flex;
  inline-size: 100%;
  block-size: var(--timeline-height);
  border-radius: var(--radius-full);
  overflow: hidden;
  border: 1px solid var(--color-border);
  box-shadow: var(--shadow-inner);
  margin-block-end: var(--space-sm);
}

.timeline__segment {
  display: flex;
  align-items: center;
  justify-content: center;
  block-size: 100%;
  position: relative;
  transition: inline-size var(--duration-slow) var(--ease-default);
}

.timeline__segment--bulk {
  background-color: var(--timeline-bulk-bg);
}

.timeline__segment--balled {
  background-color: var(--timeline-balled-bg);
}

.timeline__segment-label {
  font-size: var(--fs-caption);
  font-weight: var(--fw-semibold);
  letter-spacing: var(--ls-wide);
  color: var(--color-text-on-dark);
  opacity: 0;
  transition: opacity var(--duration-normal) var(--ease-default);
  white-space: nowrap;
}

.timeline__segment:hover .timeline__segment-label {
  opacity: 1;
}

.timeline__legend {
  display: flex;
  flex-wrap: wrap;
  gap: var(--space-md);
  font-size: var(--fs-caption);
  color: var(--color-text-secondary);
  margin-block-end: var(--space-lg);
}

.timeline__legend-item {
  display: flex;
  align-items: center;
  gap: var(--space-xs);
}

.timeline__legend-dot {
  inline-size: 0.75rem;
  block-size: 0.75rem;
  border-radius: 50%;
  flex-shrink: 0;
}

.timeline__legend-dot--bulk {
  background-color: var(--timeline-bulk-bg);
}

.timeline__legend-dot--balled {
  background-color: var(--timeline-balled-bg);
}

/* -----------------------------------------------------------------------
   Premium Lock Overlay
   ----------------------------------------------------------------------- */
.premium-lock {
  position: relative;
  border-block-start: 1px solid var(--color-border);
  padding-block-start: var(--space-md);
  margin-block-start: var(--space-md);
}

.premium-lock__btn {
  inline-size: 100%;
  position: relative;
  overflow: hidden;
  border-radius: var(--radius-md);
  border: 1px solid var(--color-border);
  background-color: var(--color-surface-sunken);
  padding: var(--space-md) var(--space-lg);
  text-align: start;
  opacity: 0.65;
  filter: grayscale(40%);
  cursor: pointer;
  transition: all var(--duration-normal) var(--ease-default);
}

.premium-lock__btn:hover {
  opacity: 0.85;
  filter: grayscale(0%);
  border-color: var(--color-premium);
  box-shadow: 0 0 0 1px var(--color-premium);
}

.premium-lock__content {
  display: flex;
  align-items: center;
  justify-content: space-between;
}

.premium-lock__left {
  display: flex;
  align-items: center;
  gap: var(--space-sm);
}

.premium-lock__icon {
  color: var(--color-text-secondary);
  font-size: 1.5rem;
}

.premium-lock__text-title {
  font-size: var(--fs-body);
  font-weight: var(--fw-semibold);
  color: var(--color-text);
}

.premium-lock__text-desc {
  font-size: var(--fs-caption);
  color: var(--color-text-secondary);
  margin-block-start: 2px;
}

.premium-lock__badge {
  display: inline-flex;
  align-items: center;
  gap: var(--space-2xs);
  padding: var(--space-2xs) var(--space-sm);
  background: linear-gradient(135deg, var(--color-gold-500), var(--color-gold-400));
  color: var(--color-on-premium);
  font-size: var(--fs-caption);
  font-weight: var(--fw-bold);
  border-radius: var(--radius-full);
  white-space: nowrap;
}

/* -----------------------------------------------------------------------
   Premium Modal (dialog)
   ----------------------------------------------------------------------- */
.premium-modal__inner {
  padding: var(--space-2xl) var(--space-xl);
  text-align: center;
}

.premium-modal__icon {
  font-size: 3rem;
  color: var(--color-premium);
  margin-block-end: var(--space-md);
}

.premium-modal__title {
  font-size: var(--fs-h2);
  font-weight: var(--fw-bold);
  color: var(--color-text);
  margin-block-end: var(--space-xs);
}

.premium-modal__desc {
  font-size: var(--fs-body);
  color: var(--color-text-secondary);
  line-height: var(--lh-relaxed);
  margin-block-end: var(--space-xl);
  max-inline-size: 36ch;
  margin-inline: auto;
}

.premium-modal__cta {
  display: inline-flex;
  align-items: center;
  gap: var(--space-xs);
  padding: var(--space-sm) var(--space-xl);
  background: linear-gradient(135deg, var(--color-gold-500), var(--color-gold-600));
  color: var(--color-on-premium);
  font-weight: var(--fw-bold);
  font-size: var(--fs-body);
  border-radius: var(--radius-md);
  box-shadow: var(--shadow-md);
  transition: all var(--duration-normal) var(--ease-default);
}

.premium-modal__cta:hover {
  filter: brightness(1.1);
  transform: translateY(-1px);
  box-shadow: var(--shadow-lg);
}

.premium-modal__close {
  display: block;
  margin-block-start: var(--space-md);
  margin-inline: auto;
  font-size: var(--fs-body-sm);
  color: var(--color-text-tertiary);
  padding: var(--space-xs) var(--space-md);
}

.premium-modal__close:hover {
  color: var(--color-text);
}

/* -----------------------------------------------------------------------
   Touch Target Enhancement
   ----------------------------------------------------------------------- */
@media (pointer: coarse) {
  .segmented__btn {
    min-block-size: 48px;
  }

  .slider::-webkit-slider-thumb {
    inline-size: 28px;
    block-size: 28px;
  }

  .slider::-moz-range-thumb {
    inline-size: 28px;
    block-size: 28px;
  }

  .bottom-nav__item {
    min-block-size: 48px;
  }
}

/* ==========================================================================
   PizzaScience — Premium Features Additions
   ========================================================================== */

/* Toggle Switch */
.toggle-switch {
  position: relative;
  display: inline-block;
  inline-size: 50px;
  block-size: 26px;
  flex-shrink: 0;
}

.toggle-switch input {
  opacity: 0;
  inline-size: 0;
  block-size: 0;
}

.toggle-switch__slider {
  position: absolute;
  cursor: pointer;
  inset: 0;
  background-color: var(--color-gray-300);
  border-radius: var(--radius-full);
  transition: background-color var(--duration-normal) var(--ease-default);
}

.toggle-switch__slider::before {
  content: "";
  position: absolute;
  block-size: 20px;
  inline-size: 20px;
  left: 3px;
  bottom: 3px;
  background-color: var(--color-white);
  border-radius: 50%;
  transition: transform var(--duration-normal) var(--ease-default);
  box-shadow: var(--shadow-sm);
}

.toggle-switch input:checked + .toggle-switch__slider {
  background-color: var(--color-accent);
}

.toggle-switch input:checked + .toggle-switch__slider::before {
  transform: translateX(24px);
}

.toggle-switch input:focus-visible + .toggle-switch__slider {
  outline: 2px solid var(--color-accent);
  outline-offset: 2px;
}

/* Empty State Visuals */
.empty-state {
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  padding: var(--space-3xl) var(--space-xl);
  text-align: center;
  background-color: var(--card-bg);
  border: 1px dashed var(--color-border);
  border-radius: var(--card-radius);
  color: var(--color-text-secondary);
  margin-block-start: var(--space-md);
}

.empty-state__icon {
  font-size: 3rem !important;
  color: var(--color-gray-400);
  margin-block-end: var(--space-sm);
  opacity: 0.8;
}

.empty-state__text {
  font-size: var(--fs-body);
  font-weight: var(--fw-semibold);
  color: var(--color-text);
  margin-block-end: var(--space-2xs);
}

.empty-state__subtext {
  font-size: var(--fs-body-sm);
  color: var(--color-text-tertiary);
  max-inline-size: 40ch;
  margin-inline: auto;
}

/* Saved Recipes View */
.recipes-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(280px, 1fr));
  gap: var(--space-lg);
  margin-block-start: var(--space-md);
}

.recipe-item-card {
  background-color: var(--card-bg);
  border: 1px solid var(--card-border);
  border-radius: var(--card-radius);
  padding: var(--card-padding);
  box-shadow: var(--card-shadow);
  display: flex;
  flex-direction: column;
  justify-content: space-between;
  gap: var(--space-sm);
  transition: transform var(--duration-normal) var(--ease-default), border-color var(--duration-normal) var(--ease-default);
}

.recipe-item-card:hover {
  transform: translateY(-2px);
  border-color: var(--color-accent);
}

.recipe-item-card__title {
  font-size: var(--fs-h2);
  font-weight: var(--fw-bold);
  color: var(--color-text);
  word-break: break-word;
}

.recipe-item-card__date {
  font-size: var(--fs-caption);
  color: var(--color-text-tertiary);
  margin-block-end: var(--space-2xs);
}

.recipe-item-card__stats {
  display: flex;
  flex-wrap: wrap;
  gap: var(--space-xs);
  margin-block: var(--space-xs);
}

.recipe-item-card__chip {
  display: inline-flex;
  align-items: center;
  padding: var(--space-2xs) var(--space-xs);
  font-size: var(--fs-caption);
  font-weight: var(--fw-semibold);
  border-radius: var(--radius-sm);
  background-color: var(--color-gray-100);
  color: var(--color-text-secondary);
}

.recipe-item-card__chip--accent {
  background-color: var(--color-accent-subtle);
  color: var(--color-accent-hover);
}

.recipe-item-card__yield {
  font-size: var(--fs-body-sm);
  color: var(--color-text-secondary);
  border-block-start: 1px solid var(--color-border-subtle);
  padding-block-start: var(--space-xs);
  margin-block-start: var(--space-2xs);
}

.recipe-item-card__actions {
  display: flex;
  justify-content: flex-end;
  gap: var(--space-sm);
  margin-block-start: var(--space-xs);
}

.btn--text-danger {
  color: var(--color-error);
  padding: var(--space-xs) var(--space-sm);
  font-size: var(--fs-body-sm);
  font-weight: var(--fw-semibold);
  border: none;
  background: transparent;
  cursor: pointer;
  border-radius: var(--radius-sm);
  transition: background-color var(--duration-fast);
}

.btn--text-danger:hover {
  background-color: var(--color-red-100);
}

/* Dough Logs Timeline */
.logs-timeline {
  position: relative;
  display: flex;
  flex-direction: column;
  gap: var(--space-xl);
  padding-inline-start: var(--space-lg);
  border-inline-start: 2px solid var(--color-border-subtle);
  margin-inline-start: var(--space-sm);
  margin-block-start: var(--space-lg);
}

.log-item {
  position: relative;
}

.log-item::before {
  content: "";
  position: absolute;
  inline-size: 14px;
  block-size: 14px;
  border-radius: 50%;
  background-color: var(--color-white);
  border: 3px solid var(--color-accent);
  left: -28px;
  top: 4px;
  box-shadow: var(--shadow-sm);
}

.log-item-card {
  background-color: var(--card-bg);
  border: 1px solid var(--card-border);
  border-radius: var(--card-radius);
  padding: var(--card-padding);
  box-shadow: var(--card-shadow);
  display: flex;
  flex-direction: column;
  gap: var(--space-sm);
}

.log-item-card__header {
  display: flex;
  align-items: flex-start;
  justify-content: space-between;
  gap: var(--space-md);
  flex-wrap: wrap;
}

.log-item-card__title {
  font-size: var(--fs-h2);
  font-weight: var(--fw-bold);
  color: var(--color-text);
}

.log-item-card__rating {
  display: flex;
  color: var(--color-gold-500);
  gap: 2px;
}

.log-item-card__notes {
  background-color: var(--color-gray-25);
  border-left: 3px solid var(--color-accent-container);
  padding: var(--space-sm) var(--space-md);
  font-size: var(--fs-body-sm);
  color: var(--color-text-secondary);
  border-radius: 0 var(--radius-md) var(--radius-md) 0;
  line-height: var(--lh-normal);
  word-break: break-word;
  white-space: pre-wrap;
}

/* Star Rating Input */
.star-rating-input {
  display: flex;
  gap: var(--space-2xs);
  color: var(--color-gray-400);
  margin-block: var(--space-2xs);
}

.star-rating-input .star-btn {
  cursor: pointer;
  font-size: 2rem !important;
  transition: color var(--duration-fast);
}

.star-rating-input .star-btn--selected {
  color: var(--color-gold-500);
  font-variation-settings: 'FILL' 1;
}

.icon-filled {
  font-variation-settings: 'FILL' 1;
}

/* Active Timers View */
.timers-view {
  display: flex;
  flex-direction: column;
  gap: var(--space-xl);
  max-inline-size: 600px;
  margin-inline: auto;
  margin-block-start: var(--space-md);
}

.timer-card {
  background-color: var(--card-bg);
  border: 1px solid var(--card-border);
  border-radius: var(--card-radius);
  padding: var(--card-padding);
  box-shadow: var(--card-shadow);
  transition: all var(--duration-normal) var(--ease-default);
}

.timer-card--active {
  border-color: var(--color-accent);
  box-shadow: 0 0 0 1px var(--color-accent), var(--shadow-lg);
  background-color: var(--color-white);
}

.timer-card--completed {
  border-color: var(--color-success);
  background-color: var(--color-gray-25);
}

.timer-card__header {
  display: flex;
  justify-content: space-between;
  align-items: center;
  margin-block-end: var(--space-sm);
}

.timer-card__phase {
  font-size: var(--fs-body);
  font-weight: var(--fw-bold);
  color: var(--color-text);
}

.timer-card__status-badge {
  font-size: var(--fs-caption);
  font-weight: var(--fw-bold);
  padding: var(--space-2xs) var(--space-sm);
  border-radius: var(--radius-full);
  background-color: var(--color-gray-100);
  color: var(--color-text-tertiary);
  text-transform: uppercase;
}

.timer-card--active .timer-card__status-badge {
  background-color: var(--color-accent-subtle);
  color: var(--color-accent-hover);
  animation: pulse-badge 2s infinite ease-in-out;
}

.timer-card--completed .timer-card__status-badge {
  background-color: var(--color-green-100);
  color: var(--color-success);
}

.timer-card__time {
  font-family: var(--font-numeric);
  font-size: clamp(2.5rem, 2rem + 2vw, 3.5rem);
  font-weight: var(--fw-bold);
  color: var(--color-text-secondary);
  text-align: center;
  margin-block: var(--space-md);
  letter-spacing: var(--ls-tight);
}

.timer-card--active .timer-card__time {
  color: var(--color-text);
}

.timer-card__progress-container {
  block-size: 8px;
  background-color: var(--color-gray-100);
  border-radius: var(--radius-full);
  overflow: hidden;
  margin-block-end: var(--space-sm);
}

.timer-card__progress-bar {
  block-size: 100%;
  background-color: var(--color-gray-300);
  border-radius: var(--radius-full);
  transition: width 1s linear;
}

.timer-card--active .timer-card__progress-bar {
  background-color: var(--color-accent);
}

.timer-card--completed .timer-card__progress-bar {
  background-color: var(--color-success);
}

.timer-card__duration-info {
  font-size: var(--fs-caption);
  color: var(--color-text-tertiary);
  text-align: end;
}

.timer-controls {
  display: flex;
  justify-content: center;
  align-items: center;
  gap: var(--space-lg);
}

.timer-controls__btn {
  display: flex;
  align-items: center;
  justify-content: center;
  border-radius: 50%;
  border: 1px solid var(--color-border);
  cursor: pointer;
  transition: all var(--duration-normal) var(--ease-default);
  box-shadow: var(--shadow-sm);
  inline-size: 48px;
  block-size: 48px;
  background-color: var(--color-surface);
  color: var(--color-text-secondary);
}

.timer-controls__btn span {
  font-size: 1.5rem !important;
}

.timer-controls__btn--play, .timer-controls__btn--pause {
  inline-size: 60px;
  block-size: 60px;
  background-color: var(--color-primary);
  color: var(--color-on-primary);
  border: none;
}

.timer-controls__btn--play span, .timer-controls__btn--pause span {
  font-size: 2rem !important;
}

.timer-controls__btn--play:hover, .timer-controls__btn--pause:hover {
  filter: brightness(1.1);
  transform: scale(1.05);
  box-shadow: var(--shadow-md);
}

.timer-controls__btn--reset:hover, .timer-controls__btn--skip:hover {
  background-color: var(--color-gray-50);
  color: var(--color-text);
  transform: scale(1.05);
}

@keyframes pulse-badge {
  0%, 100% { opacity: 1; }
  50% { opacity: 0.6; }
}

/* -----------------------------------------------------------------------
   Science Explained Styles
   ----------------------------------------------------------------------- */
.science-container {
  max-inline-size: 800px;
  margin-inline: auto;
  display: flex;
  flex-direction: column;
  gap: var(--space-lg);
  padding-block-end: var(--space-xl);
}

.science-intro-card {
  background: linear-gradient(135deg, var(--color-surface), var(--color-surface-sunken));
  border: 1px solid var(--color-border-subtle);
  border-radius: var(--card-radius);
  padding: var(--card-padding);
  box-shadow: var(--card-shadow);
}

.science-intro-card__text {
  font-size: var(--fs-body);
  line-height: var(--lh-relaxed);
  color: var(--color-text-secondary);
  margin-block-end: var(--space-md);
}

.science-intro-card__book {
  font-size: var(--fs-body-sm);
  line-height: var(--lh-normal);
  color: var(--color-text-tertiary);
  border-block-start: 1px solid var(--color-border-subtle);
  padding-block-start: var(--space-md);
}

.science-intro-card__book-link {
  font-weight: var(--fw-semibold);
  text-decoration: underline;
  color: var(--color-accent);
}

.science-card {
  background-color: var(--card-bg);
  border: 1px solid var(--card-border);
  border-radius: var(--card-radius);
  padding: var(--card-padding);
  box-shadow: var(--card-shadow);
  display: flex;
  flex-direction: column;
  gap: var(--space-md);
}

.science-card__header {
  display: flex;
  align-items: center;
  gap: var(--space-sm);
}

.science-card__number {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  inline-size: 2rem;
  block-size: 2rem;
  background-color: var(--color-accent-subtle);
  color: var(--color-accent-container);
  border-radius: var(--radius-full);
  font-weight: var(--fw-bold);
  font-size: var(--fs-body-sm);
}

.science-card__title {
  font-size: var(--fs-h2);
  font-weight: var(--fw-bold);
  color: var(--color-text);
}

.science-card__intro {
  font-size: var(--fs-body);
  color: var(--color-text-secondary);
  line-height: var(--lh-normal);
  margin-block-end: var(--space-sm);
}

.science-card__list {
  display: flex;
  flex-direction: column;
  gap: var(--space-sm);
}

.science-card__list li {
  font-size: var(--fs-body-sm);
  line-height: var(--lh-relaxed);
  color: var(--color-text-secondary);
  position: relative;
  padding-inline-start: var(--space-md);
}

.science-card__list li::before {
  content: "•";
  position: absolute;
  left: 0;
  color: var(--color-accent);
  font-weight: var(--fw-bold);
}

.science-card__highlight {
  color: var(--color-text);
  font-weight: var(--fw-semibold);
}

.science-footer {
  padding-block-start: var(--space-xl);
  border-block-start: 1px solid var(--color-border-subtle);
  margin-block-start: var(--space-xl);
}

.science-book-card {
  background: linear-gradient(135deg, var(--color-premium-subtle), var(--color-white));
  border: 1px solid var(--color-gold-400);
  border-radius: var(--card-radius);
  padding: var(--card-padding);
  box-shadow: var(--shadow-md);
  display: flex;
  align-items: center;
  gap: var(--space-md);
  text-align: start;
  transition: transform var(--duration-normal) var(--ease-default), box-shadow var(--duration-normal) var(--ease-default);
}

.science-book-card:hover {
  transform: translateY(-2px);
  box-shadow: var(--shadow-lg);
  border-color: var(--color-premium);
}

.science-book-card__icon {
  font-size: 2.5rem !important;
  color: var(--color-gold-600);
  flex-shrink: 0;
}

.science-book-card__content {
  display: flex;
  flex-direction: column;
  gap: var(--space-3xs);
}

.science-book-card__title {
  font-size: var(--fs-body);
  font-weight: var(--fw-bold);
  color: var(--color-navy-900);
  margin: 0;
}

.science-book-card__text {
  font-size: var(--fs-body-sm);
  color: var(--color-gray-700);
  line-height: var(--lh-relaxed);
  margin: 0;
}

.science-book-card__link {
  font-weight: var(--fw-bold);
  color: var(--color-gold-600);
  text-decoration: underline;
  transition: color var(--duration-fast);
}

.science-book-card__link:hover {
  color: var(--color-gold-500);
}

@media (max-width: 480px) {
  .science-book-card {
    flex-direction: column;
    align-items: flex-start;
    gap: var(--space-sm);
  }
}

/* -----------------------------------------------------------------------
   Premium Locked Section
   ----------------------------------------------------------------------- */
.premium-locked-section {
  opacity: 0.45;
  pointer-events: none;
  user-select: none;
  transition: opacity var(--duration-normal) var(--ease-default);
}

/* -----------------------------------------------------------------------
   Auth Modals (Login/Signup & Profile)
   ----------------------------------------------------------------------- */
#auth-modal,
#profile-modal {
  max-inline-size: 400px;
}

.auth-modal__inner,
.profile-modal__inner {
  position: relative;
  box-sizing: border-box;
}

.modal-close-btn {
  position: absolute;
  top: var(--space-md);
  right: var(--space-md);
  border: none;
  background: transparent;
  cursor: pointer;
  color: var(--color-text-secondary);
  padding: 4px;
  display: flex;
  align-items: center;
  justify-content: center;
  border-radius: 50%;
  transition: background-color var(--duration-fast);
}

.modal-close-btn:hover {
  background-color: var(--color-surface-sunken);
  color: var(--color-text);
}

.auth-form {
  display: flex;
  flex-direction: column;
}

.auth-form h2,
.auth-form > p {
  text-align: center;
}

.auth-form__group {
  display: flex;
  flex-direction: column;
  gap: var(--space-md);
  margin-block-end: var(--space-lg);
}

.auth-form__field {
  display: flex;
  flex-direction: column;
  gap: var(--space-3xs);
}

.auth-form__field label {
  font-size: var(--fs-body-sm);
  font-weight: var(--fw-semibold);
  color: var(--color-text);
}

.auth-form__field input {
  padding: var(--space-sm);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-md);
  font-size: var(--fs-body);
  background-color: var(--color-surface);
  color: var(--color-text);
  outline: none;
  transition: border-color var(--duration-fast);
}

.auth-form__field input:focus {
  border-color: var(--color-accent);
}

.auth-error {
  color: var(--color-error);
  font-size: var(--fs-body-sm);
  margin-block-end: var(--space-md);
  display: none;
  padding: var(--space-xs) var(--space-sm);
  border-radius: var(--radius-md);
  background-color: var(--color-accent-subtle);
  border: 1px solid var(--color-accent);
}

/* --- Premium Modal Redesign --- */
#premium-modal {
  max-inline-size: 680px; /* Wider modal for 3 columns */
}

.pricing-grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: var(--space-md);
  margin-block-end: var(--space-xl);
  margin-block-start: var(--space-lg);
}

@media (min-width: 480px) {
  .pricing-grid {
    grid-template-columns: repeat(3, 1fr);
    align-items: stretch;
  }
}

.pricing-card {
  position: relative;
  display: flex;
  flex-direction: column;
  justify-content: space-between;
  padding: var(--space-lg) var(--space-md);
  border-radius: var(--card-radius);
  border: 1px solid var(--color-border);
  background-color: var(--color-surface-sunken);
  transition: all var(--duration-normal) var(--ease-default);
}

.pricing-card:hover {
  transform: translateY(-2px);
  box-shadow: var(--shadow-md);
  border-color: var(--color-border-hover);
}

.pricing-card--popular {
  border: 2px solid var(--color-gold-500);
  background-color: var(--color-surface);
  box-shadow: var(--shadow-md);
}

.pricing-card--popular:hover {
  border-color: var(--color-gold-500);
  box-shadow: var(--shadow-lg);
}

.pricing-card__badge {
  position: absolute;
  top: -12px;
  left: 50%;
  transform: translateX(-50%);
  background: linear-gradient(135deg, var(--color-gold-500), var(--color-gold-600));
  color: var(--color-on-premium);
  font-size: var(--fs-caption);
  font-weight: var(--fw-bold);
  padding: var(--space-3xs) var(--space-sm);
  border-radius: var(--radius-full);
  text-transform: uppercase;
  letter-spacing: 0.5px;
  white-space: nowrap;
}

.pricing-card__title {
  font-size: var(--fs-body-sm);
  font-weight: var(--fw-semibold);
  color: var(--color-text-secondary);
  margin-block-end: var(--space-3xs);
  text-transform: uppercase;
  letter-spacing: 0.5px;
}

.pricing-card__price-container {
  margin-block: var(--space-sm);
}

.pricing-card__price {
  font-size: 1.75rem;
  font-weight: var(--fw-bold);
  color: var(--color-text);
  font-family: var(--font-numeric);
}

.pricing-card__period {
  font-size: var(--fs-caption);
  color: var(--color-text-secondary);
  display: block;
  margin-block-start: 2px;
}

.pricing-card__btn {
  width: 100%;
  padding: var(--space-xs) var(--space-sm);
  font-size: var(--fs-body-sm);
  font-weight: var(--fw-bold);
  border-radius: var(--radius-md);
  border: 1px solid var(--color-border);
  background-color: var(--color-surface);
  color: var(--color-text);
  cursor: pointer;
  transition: all var(--duration-fast) var(--ease-default);
  min-block-size: 40px;
}

.pricing-card__btn:hover {
  background-color: var(--color-surface-hover);
  border-color: var(--color-border-hover);
}

.pricing-card--popular .pricing-card__btn {
  background: linear-gradient(135deg, var(--color-gold-500), var(--color-gold-600));
  color: var(--color-on-premium);
  border: none;
}

.pricing-card--popular .pricing-card__btn:hover {
  filter: brightness(1.1);
}

/* -----------------------------------------------------------------------
   Legal Pages (Terms, Privacy)
   ----------------------------------------------------------------------- */
.legal-card {
  background-color: var(--card-bg);
  border: 1px solid var(--card-border);
  border-radius: var(--card-radius);
  padding: var(--card-padding);
  box-shadow: var(--card-shadow);
}

.legal-card__title {
  font-size: var(--fs-h2);
  margin-block-end: var(--space-md);
  color: var(--color-text);
}

.legal-card__subtitle {
  font-size: var(--fs-body-sm);
  color: var(--color-text-secondary);
  margin-block-end: var(--space-lg);
  border-block-end: 1px solid var(--color-border-subtle);
  padding-block-end: var(--space-sm);
}

.legal-content {
  display: flex;
  flex-direction: column;
  gap: var(--space-md);
  line-height: var(--lh-relaxed);
  color: var(--color-text);
}

.legal-content h3 {
  font-size: var(--fs-h3);
  margin-block-start: var(--space-md);
  color: var(--color-text);
}

.legal-content ul {
  list-style: disc;
  padding-inline-start: var(--space-lg);
  display: flex;
  flex-direction: column;
  gap: var(--space-xs);
}

.legal-content li {
  text-wrap: pretty;
}

/* -----------------------------------------------------------------------
   Pill Toggle Buttons
   ----------------------------------------------------------------------- */
.toggle-group {
  display: flex;
  gap: 4px;
}

.pill-btn {
  display: flex;
  align-items: center;
  gap: var(--space-2xs);
  padding: var(--space-2xs) var(--space-sm);
  font-size: var(--fs-body-sm);
  font-weight: var(--fw-semibold);
  color: var(--color-text-secondary);
  background-color: var(--color-surface-sunken);
  border-radius: var(--radius-full);
  transition: all var(--duration-fast) var(--ease-default);
  border: none;
  cursor: pointer;
}

.pill-btn:hover {
  background-color: var(--color-gray-200);
  color: var(--color-text);
}

.pill-btn--active {
  background-color: var(--color-primary);
  color: var(--color-on-primary);
}

/* === css/animations.css === */
/* ==========================================================================
   PizzaScience — Animations
   Micro-animations for engagement: load transitions, value updates,
   slider interactions, and hover effects.
   ========================================================================== */

/* -----------------------------------------------------------------------
   Page Load — Staggered Fade-In
   ----------------------------------------------------------------------- */
@keyframes fadeSlideUp {
  from {
    opacity: 0;
    transform: translateY(12px);
  }
  to {
    opacity: 1;
    transform: translateY(0);
  }
}

.animate-in {
  animation: fadeSlideUp var(--duration-slow) var(--ease-out) both;
}

/* Stagger children */
.animate-in:nth-child(1) { animation-delay: 0ms; }
.animate-in:nth-child(2) { animation-delay: 80ms; }
.animate-in:nth-child(3) { animation-delay: 160ms; }
.animate-in:nth-child(4) { animation-delay: 240ms; }
.animate-in:nth-child(5) { animation-delay: 320ms; }
.animate-in:nth-child(6) { animation-delay: 400ms; }

/* -----------------------------------------------------------------------
   Value Pulse — Brief scale on update
   ----------------------------------------------------------------------- */
@keyframes valuePulse {
  0%   { transform: scale(1); }
  50%  { transform: scale(1.04); }
  100% { transform: scale(1); }
}

.value-pulse {
  animation: valuePulse 250ms var(--ease-out);
}

/* -----------------------------------------------------------------------
   Card Hover Lift
   ----------------------------------------------------------------------- */
.recipe-card {
  transition: transform var(--duration-normal) var(--ease-default),
              box-shadow var(--duration-normal) var(--ease-default);
}

.recipe-card:hover {
  transform: translateY(-2px);
  box-shadow: var(--shadow-lg);
}

/* -----------------------------------------------------------------------
   Button Press
   ----------------------------------------------------------------------- */
.segmented__btn:active:not(.segmented__btn--active) {
  transform: scale(0.96);
}

/* -----------------------------------------------------------------------
   Sidebar link hover shimmer
   ----------------------------------------------------------------------- */
.sidebar__nav-link {
  position: relative;
  overflow: hidden;
}

.sidebar__nav-link::after {
  content: '';
  position: absolute;
  inset-block-start: 0;
  inset-inline-start: -100%;
  inline-size: 100%;
  block-size: 100%;
  background: linear-gradient(
    90deg,
    transparent,
    rgb(255 255 255 / 0.04),
    transparent
  );
  transition: inset-inline-start var(--duration-slow) var(--ease-default);
  pointer-events: none;
}

.sidebar__nav-link:hover::after {
  inset-inline-start: 100%;
}

/* -----------------------------------------------------------------------
   Premium badge glow
   ----------------------------------------------------------------------- */
@keyframes goldGlow {
  0%, 100% { opacity: 0.2; transform: scale(1); }
  50%      { opacity: 0.8; transform: scale(1.06); }
}

.premium-lock__badge {
  position: relative;
  box-shadow: 0 0 8px 1px rgb(212 168 83 / 0.25);
}

.premium-lock__badge::after {
  content: "";
  position: absolute;
  inset: 0;
  border-radius: inherit;
  box-shadow: 0 0 12px 2px var(--color-gold-400);
  opacity: 0.2;
  animation: goldGlow 3s var(--ease-default) infinite;
  pointer-events: none;
}

/* -----------------------------------------------------------------------
   Upgrade button shine
   ----------------------------------------------------------------------- */
.sidebar__upgrade-btn {
  position: relative;
  overflow: hidden;
}

.sidebar__upgrade-btn::after {
  content: '';
  position: absolute;
  inset-block-start: 0;
  inset-inline-start: -150%;
  inline-size: 100%;
  block-size: 100%;
  background: linear-gradient(
    105deg,
    transparent 40%,
    rgb(255 255 255 / 0.25) 50%,
    transparent 60%
  );
  animation: btnShine 4s var(--ease-default) infinite;
}

@keyframes btnShine {
  0%   { inset-inline-start: -150%; }
  30%  { inset-inline-start: 150%; }
  100% { inset-inline-start: 150%; }
}

/* -----------------------------------------------------------------------
   Hydration tag color transitions
   ----------------------------------------------------------------------- */
.hydration-tag {
  transition: background-color var(--duration-slow) var(--ease-default),
              color var(--duration-slow) var(--ease-default);
}

/* -----------------------------------------------------------------------
   Reduced Motion
   ----------------------------------------------------------------------- */
@media (prefers-reduced-motion: reduce) {
  *,
  *::before,
  *::after {
    animation-duration: 0.01ms !important;
    animation-iteration-count: 1 !important;
    transition-duration: 0.01ms !important;
  }
}