/* ═══════════════════════════════════════════════════════════════════════════
   design-system.css — fudami landing design system
   Single source of truth. Every page imports this one file.
   ═══════════════════════════════════════════════════════════════════════════ */

/* ── 0. Smooth Scrolling ────────────────────────────────────────────────── */
html {
  scroll-behavior: smooth;
}

/* ── 1. CSS Custom Properties ───────────────────────────────────────────── */
:root {
  /* Canvas, surface & text — Light mode (washi paper) */
  --background-rgb: 249, 247, 241;   /* washi-paper: #F9F7F1 */
  --surface-rgb: 255, 255, 255;      /* washi-light: #FFFFFF */
  --surface-light-rgb: 242, 239, 233;/* washi-paper-dark: #F2EFE9 */
  --text-rgb: 44, 42, 41;            /* sumi-ink: #2C2A29 */
  --text-muted-rgb: 107, 102, 97;    /* sumi-muted: #6B6661 */
  --emphasis-rgb: 17, 16, 15;        /* sumi-ink-dark: #11100F */

  /* Brand accents — Light mode */
  --primary-rgb: 232, 57, 41;        /* hanko-red: #E83929 */
  --success-rgb: 0, 169, 104;        /* matcha-green: #00A968 */
  --secondary-rgb: 29, 47, 111;      /* aizome-indigo: #1D2F6F */

  /* Computed fallbacks for raw usage */
  --background: rgb(var(--background-rgb));
  --surface: rgb(var(--surface-rgb));
  --surface-light: rgb(var(--surface-light-rgb));
  --text: rgb(var(--text-rgb));
  --text-muted: rgb(var(--text-muted-rgb));
  --emphasis: rgb(var(--emphasis-rgb));
  --primary: rgb(var(--primary-rgb));
  --success: rgb(var(--success-rgb));
  --secondary: rgb(var(--secondary-rgb));

  /* Glass material tokens — Light mode */
  --glass-bg: rgba(255, 255, 255, 0.40);
  --glass-border: rgba(255, 255, 255, 0.50);
  --glass-shadow: rgba(0, 0, 0, 0.05);
}

/* ── Dark mode overrides ────────────────────────────────────────────────── */
.dark {
  --background-rgb: 18, 18, 18;      /* charcoal: #121212 */
  --surface-rgb: 30, 30, 30;         /* charcoal-light: #1E1E1E */
  --surface-light-rgb: 42, 42, 42;   /* charcoal-lighter: #2A2A2A */
  --text-rgb: 234, 234, 234;         /* off-white: #EAEAEA */
  --text-muted-rgb: 160, 160, 160;   /* muted grey: #A0A0A0 */
  --emphasis-rgb: 255, 255, 255;     /* white: #FFFFFF */

  /* Brand accents — Dark mode (softened for comfort) */
  --primary-rgb: 255, 107, 107;      /* hanko-red softened: #FF6B6B */
  --success-rgb: 46, 202, 127;       /* matcha-green softened: #2ECA7F */
  --secondary-rgb: 109, 141, 237;    /* aizome-indigo softened: #6D8DED */

  /* Glass material tokens — Dark mode */
  --glass-bg: rgba(30, 30, 30, 0.55);
  --glass-border: rgba(255, 255, 255, 0.05);
  --glass-shadow: rgba(0, 0, 0, 0.30);
}


/* ── 2. Body Base ───────────────────────────────────────────────────────── */
body {
  background-color: var(--background);
  color: var(--text);
  /* Subtle ambient radial — hanko-red tint, very faint */
  background-image:
    radial-gradient(ellipse at 80% -10%, rgba(var(--primary-rgb), 0.04) 0%, transparent 50%),
    radial-gradient(ellipse at 20% 100%, rgba(var(--secondary-rgb), 0.03) 0%, transparent 50%);
  transition: background-color 0.3s ease, color 0.3s ease;
}

::selection {
  background: rgb(var(--primary-rgb));
  color: #fff;
}


/* ── 3. Glass Materials ─────────────────────────────────────────────────── */

/* Hero-level glass: blur(24px), full shadow + edge-highlight */
.liquid-glass {
  background: var(--glass-bg);
  backdrop-filter: blur(24px);
  -webkit-backdrop-filter: blur(24px);
  border-top: 1px solid var(--glass-border);
  border-left: 1px solid var(--glass-border);
  box-shadow: 0 12px 32px 0 var(--glass-shadow);
  transition: background 0.3s ease, border-color 0.3s ease, box-shadow 0.3s ease;
}

/* Card-level glass: blur(16px) */
.card-glass {
  background: var(--glass-bg);
  backdrop-filter: blur(16px);
  -webkit-backdrop-filter: blur(16px);
  border: 1px solid var(--glass-border);
  box-shadow: 0 8px 24px 0 var(--glass-shadow);
  transition: background 0.3s ease, border-color 0.3s ease, box-shadow 0.3s ease;
}

/* Chrome/nav glass: blur(16px), bottom-border only */
.chrome-glass {
  background: var(--glass-bg);
  backdrop-filter: blur(16px);
  -webkit-backdrop-filter: blur(16px);
  border-bottom: 1px solid var(--glass-border);
  transition: background 0.3s ease, border-color 0.3s ease;
}


/* ── 4. Typography Helpers ──────────────────────────────────────────────── */

.text-reading-guide-forced {
  font-size: 22px;
  line-height: 28px;
  letter-spacing: 0.05em;
  font-weight: 500;
}

.text-reading-guide-title {
  font-size: 48px;
  line-height: 1.2;
  font-weight: 700;
  letter-spacing: -0.02em;
}

.text-hero-display {
  font-size: 44px;
  line-height: 1.1;
  font-weight: 800;
  letter-spacing: -0.03em;
}

@media (min-width: 768px) {
  .text-hero-display {
    font-size: 64px;
  }
}

@media (min-width: 1024px) {
  .text-hero-display {
    font-size: 72px;
  }
}


/* ── 5. Button Styles ───────────────────────────────────────────────────── */

/* Primary CTA — solid hanko-red, soft lift shadow */
.btn-hanko {
  background-color: rgb(var(--primary-rgb));
  color: #fff;
  font-weight: 700;
  border: none;
  cursor: pointer;
  box-shadow: 0 4px 12px rgba(var(--primary-rgb), 0.3);
  transition:
    transform 0.15s cubic-bezier(0.34, 1.56, 0.64, 1),
    box-shadow 0.15s ease,
    filter 0.15s ease;
}

.btn-hanko:hover {
  filter: brightness(1.08);
  transform: translateY(-1px);
  box-shadow: 0 6px 20px rgba(var(--primary-rgb), 0.4);
}

.btn-hanko:active {
  transform: translateY(1px);
  box-shadow: 0 2px 8px rgba(var(--primary-rgb), 0.25);
}

/* Outline variant */
.btn-outline {
  background: transparent;
  border: 2px solid rgba(var(--primary-rgb), 0.4);
  color: rgb(var(--primary-rgb));
  font-weight: 700;
  cursor: pointer;
  transition: all 0.2s ease;
}

.btn-outline:hover {
  background: rgba(var(--primary-rgb), 0.08);
  border-color: rgb(var(--primary-rgb));
}

/* Ghost — no border, text only */
.btn-ghost {
  background: transparent;
  border: none;
  color: rgb(var(--text-rgb));
  cursor: pointer;
  transition: all 0.2s ease;
}

.btn-ghost:hover {
  background: rgba(var(--text-rgb), 0.05);
}


/* ── 6. Utilities ───────────────────────────────────────────────────────── */

.fudami-icon-container {
  box-shadow: 0 4px 8px rgba(0, 0, 0, 0.4);
  border: 2px solid rgba(249, 247, 241, 0.05);
}

/* Scroll-reveal animation (pairs with IntersectionObserver in components.js) */
.section-fade-in {
  opacity: 0;
  transform: translateY(24px);
}

.section-visible {
  opacity: 1;
  transform: translateY(0);
  transition: opacity 0.6s ease-out, transform 0.6s ease-out;
}

/* Ambient glow orbs */
.glow-red {
  position: absolute;
  border-radius: 50%;
  background: radial-gradient(circle, rgba(var(--primary-rgb), 0.08) 0%, transparent 70%);
  pointer-events: none;
  filter: blur(60px);
}

.glow-green {
  position: absolute;
  border-radius: 50%;
  background: radial-gradient(circle, rgba(var(--success-rgb), 0.06) 0%, transparent 70%);
  pointer-events: none;
  filter: blur(60px);
}

.glow-blue {
  position: absolute;
  border-radius: 50%;
  background: radial-gradient(circle, rgba(var(--secondary-rgb), 0.06) 0%, transparent 70%);
  pointer-events: none;
  filter: blur(60px);
}


/* ── 7. Animations ──────────────────────────────────────────────────────── */

@keyframes float {
  0%, 100% { transform: translateY(0); }
  50% { transform: translateY(-10px); }
}

@keyframes pulse-glow {
  0%, 100% { opacity: 0.3; }
  50% { opacity: 0.6; }
}

@keyframes slide-up {
  from { opacity: 0; transform: translateY(20px); }
  to { opacity: 1; transform: translateY(0); }
}

@keyframes fade-in {
  from { opacity: 0; }
  to { opacity: 1; }
}

.animate-float {
  animation: float 6s ease-in-out infinite;
}

.animate-pulse-glow {
  animation: pulse-glow 4s ease-in-out infinite;
}

.animate-slide-up {
  animation: slide-up 0.6s ease-out both;
}


/* ── 8. Scrollbar ───────────────────────────────────────────────────────── */

::-webkit-scrollbar {
  width: 6px;
}

::-webkit-scrollbar-track {
  background: transparent;
}

::-webkit-scrollbar-thumb {
  background: rgba(var(--text-muted-rgb), 0.2);
  border-radius: 3px;
}

::-webkit-scrollbar-thumb:hover {
  background: rgba(var(--text-muted-rgb), 0.4);
}