/* ── Brand tokens ── */
:root {
  /* ── Base color palette ── */
  --color-white: #fff;
  --color-black: #000;
  --brand-purple: #4a1fb8;

  /* RGB channels (for rgba() usage) */
  --white-rgb: 255, 255, 255;
  --black-rgb: 0, 0, 0;
  --mint-rgb: 166, 255, 163;
  --shadow-rgb: 20, 0, 60;

  /* ── Semantic colors ── */
  --purple-gradient: linear-gradient(120deg, #9179eb 0%, #6c38fa 55%, var(--brand-purple) 100%);
  --purple-gradient-inverse: linear-gradient(180deg, #9179eb 0%, #6c38fa 100%);
  --chat-bg: #8A2BE2;
  --ai-color: #A6FFA3;
  --user-color: #FFF7F6;
  --bg-color: #28044A;
  --darkest: #6c38fa;

  --accent-mint: var(--ai-color);
  --accent-pink: #ff5ac8;
  --accent-violet: #9179eb;

  /* ── Text opacity variants ── */
  --text-bright:  rgba(var(--white-rgb), 0.82);
  --text-muted:   rgba(var(--white-rgb), 0.55);
  --text-soft:    rgba(var(--white-rgb), 0.75);

  /* ── Accent button tokens ── */
  --accent-border:      rgba(var(--white-rgb), 0.4);
  --accent-border-hover: rgba(var(--white-rgb), 0.55);
  --accent-inset:       0 1px 0 rgba(var(--white-rgb), 0.6) inset;
  --accent-glow:        0 4px 14px rgba(var(--mint-rgb), 0.30);
  --accent-glow-hover:  0 8px 22px rgba(var(--mint-rgb), 0.50);

  /* ── Glass sheen (::before overlay on glass surfaces) ── */
  --glass-sheen:
    linear-gradient(180deg, rgba(var(--white-rgb), 0.22) 0%, rgba(var(--white-rgb), 0) 35%),
    radial-gradient(120% 80% at 50% -10%, rgba(var(--white-rgb), 0.35), transparent 60%);
  --glass-sheen-narrow:
    linear-gradient(180deg, rgba(var(--white-rgb), 0.22) 0%, rgba(var(--white-rgb), 0) 32%),
    radial-gradient(120% 70% at 50% -10%, rgba(var(--white-rgb), 0.35), transparent 60%);
  --glass-sheen-wide:
    linear-gradient(180deg, rgba(var(--white-rgb), 0.22) 0%, rgba(var(--white-rgb), 0) 40%),
    radial-gradient(120% 70% at 50% -10%, rgba(var(--white-rgb), 0.35), transparent 60%);

  /* ── Liquid glass tokens ── */
  --glass-tint:        rgba(var(--white-rgb), 0.10);
  --glass-tint-strong: rgba(var(--white-rgb), 0.18);
  --glass-tint-soft:   rgba(var(--white-rgb), 0.06);
  --glass-stroke:      rgba(var(--white-rgb), 0.28);
  --glass-stroke-soft: rgba(var(--white-rgb), 0.16);
  --glass-highlight:   rgba(var(--white-rgb), 0.55);
  --glass-shadow:
    0 1px 0 rgba(var(--white-rgb), 0.35) inset,
    0 -1px 0 rgba(var(--white-rgb), 0.08) inset,
    0 8px 32px rgba(var(--shadow-rgb), 0.28),
    0 2px 8px rgba(var(--shadow-rgb), 0.18);
  --glass-shadow-hover:
    0 1px 0 rgba(var(--white-rgb), 0.45) inset,
    0 -1px 0 rgba(var(--white-rgb), 0.08) inset,
    0 14px 40px rgba(var(--shadow-rgb), 0.35),
    0 4px 14px rgba(var(--shadow-rgb), 0.22);
  --glass-blur: 24px;
  --glass-radius: 18px;

  /* ── Print colors ── */
  --print-bg: #fff;
  --print-text: #000;
  --print-border: #ccc;
  --print-border-soft: #ddd;

  /* ── Type scale (modular ~1.2) ── */
  --text-xs:   0.78rem;
  --text-sm:   0.9rem;
  --text-base: 1rem;
  --text-md:   1.15rem;
  --text-lg:   1.35rem;
  --text-xl:   1.7rem;
  --text-2xl:  2.1rem;
  --text-3xl:  2.6rem;

  /* ── Spacing (4px base) ── */
  --space-1: 0.25rem;
  --space-2: 0.5rem;
  --space-3: 0.75rem;
  --space-4: 1rem;
  --space-5: 1.5rem;
  --space-6: 2rem;
  --space-8: 3rem;

  /* ── Layout ── */
  --content-max-width: 11.5in;
  --content-measure: 52ch;

  /* ── Typography ── */
  --font-display: 'Signika', sans-serif;

  /* ── Dark theme background ── */
  --dark-deepest: #0a0014;
  --dark-mid:     #1a0033;
  --dark-edge:    #06000f;
  --bg-dark-gradient: linear-gradient(160deg, var(--dark-deepest) 0%, var(--dark-mid) 60%, var(--dark-edge) 100%);

  /* ── Radius ── */
  --radius-sm: 8px;
  --radius-md: 12px;
  --radius-lg: 18px;
  --radius-pill: 999px;

  /* ── Motion ── */
  --ease-out:    cubic-bezier(0.22, 1, 0.36, 1);
  --ease-spring: cubic-bezier(0.34, 1.56, 0.64, 1);
  --dur-fast: 0.15s;
  --dur-med:  0.25s;
  --dur-slow: 0.45s;
}

/* ── Cross-document view transitions (eliminates white flash between pages) ── */
@view-transition {
  navigation: auto;
}

::view-transition-old(root),
::view-transition-new(root) {
  animation: none;
}

*, *::before, *::after { box-sizing: border-box; }

html {
  background: var(--brand-purple);
}

html, body {
  margin: 0;
  min-height: 100vh;
}

/* ── Selection ── */
::selection {
  background: var(--accent-mint);
  color: var(--bg-color);
}

/* ── Focus ── */
:focus-visible {
  outline: 2px solid var(--accent-mint);
  outline-offset: 2px;
  border-radius: var(--radius-sm);
}

/* ── Scrollbars (webkit) ── */
*::-webkit-scrollbar { width: 10px; height: 10px; }
*::-webkit-scrollbar-track { background: transparent; }
*::-webkit-scrollbar-thumb {
  background: var(--glass-tint);
  border: 2px solid transparent;
  background-clip: padding-box;
  border-radius: var(--radius-pill);
}
*::-webkit-scrollbar-thumb:hover { background: var(--glass-tint-strong); background-clip: padding-box; }
/* Firefox */
* { scrollbar-width: thin; scrollbar-color: var(--glass-tint) transparent; }

/* ── Ambient background orbs (sit behind content via fixed pos + z-index) ── */
body::before,
body::after {
  content: "";
  position: fixed;
  width: 60vmax;
  height: 60vmax;
  border-radius: 50%;
  pointer-events: none;
  z-index: 0;
  filter: blur(80px);
  opacity: 0.35;
  transition: opacity var(--dur-slow) var(--ease-out);
  will-change: opacity;
  contain: strict;
}
body::before {
  top: -20vmax;
  left: -15vmax;
  background: radial-gradient(circle, var(--accent-mint) 0%, transparent 65%);
}
body::after {
  bottom: -25vmax;
  right: -20vmax;
  background: radial-gradient(circle, var(--accent-pink) 0%, transparent 65%);
  opacity: 0.25;
}
.dark-theme body::before { opacity: 0.20; }
.dark-theme body::after  { opacity: 0.18; }

/* ── Reusable glass surface ── */
.glass {
  position: relative;
  background: var(--glass-tint);
  border: 1px solid var(--glass-stroke);
  border-radius: var(--glass-radius);
  box-shadow: var(--glass-shadow);
  isolation: isolate;
}
.glass::before {
  content: "";
  position: absolute;
  inset: 0;
  border-radius: inherit;
  pointer-events: none;
  background:
    linear-gradient(180deg, rgba(var(--white-rgb),0.22) 0%, rgba(var(--white-rgb),0) 35%),
    radial-gradient(120% 80% at 50% -10%, rgba(var(--white-rgb),0.35), transparent 60%);
  mix-blend-mode: screen;
  opacity: 0.7;
  z-index: 0;
  transition: opacity var(--dur-med) var(--ease-out);
}
.glass > * { position: relative; z-index: 1; }
.glass:hover::before { opacity: 1; }

.glass-strong { background: var(--glass-tint-strong); }
.glass-soft   { background: var(--glass-tint-soft);   }

/* ── Shared nav pills ── */
.nav-pills {
  display: flex;
  align-items: center;
  gap: var(--space-2);
  flex-wrap: nowrap;
  width: 100%;
  min-width: min-content;
}
.nav-pill {
  display: inline-flex;
  align-items: center;
  gap: var(--space-2);
  padding: 0.4rem 0.6rem;
  font-family: var(--font-display);
  font-size: var(--text-sm);
  font-weight: 600;
  letter-spacing: 0.01em;
  color: var(--user-color);
  text-decoration: none;
  background: var(--glass-tint-soft);
  border: 1px solid var(--glass-stroke-soft);
  border-radius: var(--radius-pill);
  cursor: pointer;
  transition: background var(--dur-fast) var(--ease-out),
              border-color var(--dur-fast) var(--ease-out),
              transform var(--dur-fast) var(--ease-out),
              color var(--dur-fast) var(--ease-out),
              opacity var(--dur-fast) var(--ease-out);
}
.nav-pill:hover {
  background: var(--glass-tint);
  border-color: var(--glass-stroke);
  transform: translateY(-1px);
}
.nav-pill.is-current,
.nav-pill-primary {
  background: var(--accent-mint);
  color: var(--chat-bg);
  border-color: rgba(var(--white-rgb),0.4);
  box-shadow:
    0 1px 0 rgba(var(--white-rgb),0.6) inset,
    0 4px 14px rgba(var(--mint-rgb),0.30);
  opacity: 1;
  font-style: normal;
  font-weight: 600;
}
.nav-pill.is-current:hover,
.nav-pill-primary:hover {
  background: var(--accent-mint);
  color: var(--chat-bg);
  border-color: rgba(var(--white-rgb),0.55);
}
.nav-pill-quiet {
  opacity: 0.78;
  font-weight: 400;
}
.nav-pill-quiet:hover { opacity: 1; }

/* Push the theme toggle to the far right of the nav bar */
.nav-pills .theme-toggle-button { margin-left: auto; }

/* Standalone glass header bar — same look + position across all pages */
.site-header {
  position: relative;
  z-index: 2;
  display: flex;
  align-items: center;
  gap: var(--space-3);
  padding: var(--space-3) var(--space-5);
  background: var(--glass-tint);
  backdrop-filter: blur(var(--glass-blur));
  -webkit-backdrop-filter: blur(var(--glass-blur));
  border: 1px solid var(--glass-stroke);
  border-radius: var(--glass-radius);
  box-shadow: var(--glass-shadow);
  flex-wrap: wrap;
  flex: 0 0 auto;
  min-width: min-content;
}
.site-header-wrap {
  position: sticky;
  top: 0;
  z-index: 100;
  max-width: var(--content-max-width);
  margin: 0 auto;
  padding: clamp(var(--space-4), 5vw, 3rem) clamp(var(--space-4), 5vw, 3rem) var(--space-5);
}

/* ── Shared buttons ── */
.theme-toggle-button {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  border-radius: 50%;
  width: 40px;
  height: 40px;
  color: var(--ai-color);
  background: var(--glass-tint-strong);
  border: 1px solid var(--glass-stroke);
  box-shadow: var(--glass-shadow);
  cursor: pointer;
  transition: transform var(--dur-med) var(--ease-out), background var(--dur-med) var(--ease-out);
  padding: 0;
}
.theme-toggle-button:hover {
  background: rgba(var(--white-rgb),0.28);
  transform: translateY(-1px);
}
.theme-icon {
  width: 20px;
  height: 20px;
  display: block;
  transition: transform var(--dur-slow) var(--ease-spring);
}
.theme-toggle-button:hover .theme-icon { transform: rotate(180deg); }

/* ── Scroll progress bar ── */
#scroll-progress-container {
  position: fixed;
  top: 0;
  left: 0;
  width: 100%;
  height: 4px;
  background: rgba(var(--white-rgb), 0.10);
  z-index: 9999;
}
#scroll-progress-bar {
  height: 100%;
  width: 0%;
  background: linear-gradient(90deg, var(--accent-mint), var(--accent-violet) 60%, var(--accent-pink));
  box-shadow: 0 0 12px rgba(var(--mint-rgb), 0.6);
  transition: width 0.15s ease-out;
}

/* ── Dark theme overrides ── */
.dark-theme,
.dark-theme body {
  background: var(--bg-dark-gradient);
}
.dark-theme #scroll-progress-container {
  background: rgba(var(--white-rgb), 0.10);
}
.dark-theme #scroll-progress-bar {
  background: linear-gradient(90deg, var(--accent-mint), var(--color-white));
}

/* ── Page-enter fade-up (apply to .fade-in or .glass children of [data-stagger]) ── */
@keyframes fade-up {
  from { opacity: 0; transform: translateY(8px); }
  to   { opacity: 1; transform: translateY(0); }
}
.fade-in {
  animation: fade-up var(--dur-slow) var(--ease-out) both;
}
[data-stagger] > * { animation: fade-up var(--dur-slow) var(--ease-out) both; }
[data-stagger] > *:nth-child(1) { animation-delay: 0ms;   }
[data-stagger] > *:nth-child(2) { animation-delay: 60ms;  }
[data-stagger] > *:nth-child(3) { animation-delay: 120ms; }
[data-stagger] > *:nth-child(4) { animation-delay: 180ms; }
[data-stagger] > *:nth-child(5) { animation-delay: 240ms; }
[data-stagger] > *:nth-child(6) { animation-delay: 300ms; }
[data-stagger] > *:nth-child(7) { animation-delay: 360ms; }

/* Skip stagger animations during view-transition navigations */
.vt-nav [data-stagger] > *,
.vt-nav .fade-in {
  animation: none !important;
}

/* ── Reduced motion ── */
@media (prefers-reduced-motion: reduce) {
  *, *::before, *::after {
    animation-duration: 0.001ms !important;
    animation-iteration-count: 1 !important;
    transition-duration: 0.001ms !important;
    scroll-behavior: auto !important;
  }
}