/* ================================================================
   Folio 官方網站 — 水彩鉛筆風格
   設計 token 對齊 app/STYLE_GUIDE.md（v2.1 五色色票）
   ================================================================ */

:root {
  --parchment: #F8F1E4;
  --cream: #FAF3E7;
  --sage: #6B8064;
  --sage-soft: #8FA28A;
  --lavender: #9B8FB5;
  --lavender-soft: #B8AECB;
  --walnut: #3D2F1F;
  --walnut-soft: #6B5641;
  --amber: #C9B89A;
  --amber-soft: #DCCAB0;
  --pink: #E8C4BD;
  --misty-blue: #A6B5C2;

  --font-serif: 'Noto Serif TC', 'EB Garamond', Georgia, serif;
  --font-sans: 'Noto Sans TC', 'Inter', -apple-system, sans-serif;
  --font-mono: 'JetBrains Mono', 'Courier New', monospace;
  --font-italic: 'EB Garamond', 'Noto Serif TC', serif;

  --shadow-soft: 0 4px 24px rgba(61, 47, 31, 0.06);
  --shadow-paper: 0 1px 2px rgba(61, 47, 31, 0.04), 0 8px 32px rgba(61, 47, 31, 0.06);

  --radius-soft: 14px;
  --radius-card: 22px;

  --ease-watercolor: cubic-bezier(0.22, 0.61, 0.36, 1);
}

/* ---------- Reset ---------- */
*, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }
html { scroll-behavior: smooth; -webkit-font-smoothing: antialiased; }
body {
  font-family: var(--font-sans);
  color: var(--walnut);
  background: var(--parchment);
  line-height: 1.7;
  font-size: 16px;
  overflow-x: hidden;
  position: relative;
}

/* ---------- 紙感背景紋理（SVG noise + radial blob）---------- */
body::before {
  content: '';
  position: fixed;
  inset: 0;
  background-image:
    radial-gradient(at 15% 20%, rgba(155, 143, 181, 0.08) 0%, transparent 45%),
    radial-gradient(at 85% 75%, rgba(107, 128, 100, 0.07) 0%, transparent 50%),
    radial-gradient(at 50% 110%, rgba(232, 196, 189, 0.05) 0%, transparent 55%);
  pointer-events: none;
  z-index: -2;
}

body::after {
  content: '';
  position: fixed;
  inset: 0;
  background-image: url("data:image/svg+xml;utf8,<svg xmlns='http://www.w3.org/2000/svg' width='400' height='400'><filter id='n'><feTurbulence type='fractalNoise' baseFrequency='0.85' numOctaves='2' stitchTiles='stitch'/><feColorMatrix values='0 0 0 0 0.24 0 0 0 0 0.18 0 0 0 0 0.12 0 0 0 0.04 0'/></filter><rect width='100%' height='100%' filter='url(%23n)'/></svg>");
  pointer-events: none;
  opacity: 0.5;
  z-index: -1;
  mix-blend-mode: multiply;
}

/* ---------- Typography ---------- */
h1, h2, h3, h4 {
  font-family: var(--font-serif);
  font-weight: 600;
  color: var(--walnut);
  line-height: 1.35;
  letter-spacing: 0.01em;
}
h1 { font-size: clamp(2.2rem, 5vw, 3.6rem); }
h2 { font-size: clamp(1.6rem, 3.5vw, 2.4rem); margin-bottom: 1.2rem; }
h3 { font-size: 1.25rem; margin-bottom: 0.6rem; }
p { margin-bottom: 1rem; color: var(--walnut-soft); }

a {
  color: var(--sage);
  text-decoration: none;
  transition: color 0.4s var(--ease-watercolor);
}
a:hover { color: var(--lavender); }

em, .italic { font-family: var(--font-italic); font-style: italic; }

/* ---------- Layout ---------- */
.container {
  max-width: 1100px;
  margin: 0 auto;
  padding: 0 24px;
}

section {
  padding: clamp(60px, 10vh, 120px) 0;
  position: relative;
}

/* ---------- Top Nav ---------- */
.nav {
  position: fixed;
  top: 0; left: 0; right: 0;
  z-index: 100;
  padding: 18px 32px;
  display: flex;
  justify-content: space-between;
  align-items: center;
  background: rgba(248, 241, 228, 0.7);
  backdrop-filter: blur(12px);
  -webkit-backdrop-filter: blur(12px);
  border-bottom: 1px solid rgba(201, 184, 154, 0.25);
  transition: background 0.6s var(--ease-watercolor);
}
.nav-logo {
  display: flex;
  align-items: center;
  gap: 10px;
  font-family: var(--font-serif);
  font-weight: 600;
  font-size: 1.2rem;
  color: var(--walnut);
}
.nav-logo img { width: 28px; height: 28px; border-radius: 6px; }
.nav-links {
  display: flex;
  gap: 28px;
  font-size: 0.95rem;
}
.nav-links a {
  color: var(--walnut-soft);
  position: relative;
  padding: 4px 0;
}
.nav-links a::after {
  content: '';
  position: absolute;
  bottom: 0; left: 0; right: 0;
  height: 1px;
  background: var(--sage);
  transform: scaleX(0);
  transform-origin: right;
  transition: transform 0.5s var(--ease-watercolor);
}
.nav-links a:hover::after { transform: scaleX(1); transform-origin: left; }

@media (max-width: 640px) {
  .nav { padding: 14px 18px; }
  .nav-links { gap: 16px; font-size: 0.85rem; }
}

/* ---------- Hero ---------- */
.hero {
  min-height: 100vh;
  display: flex;
  align-items: center;
  padding-top: 80px;
  position: relative;
}
.hero-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 60px;
  align-items: center;
}
.hero-text .eyebrow {
  font-family: var(--font-italic);
  font-style: italic;
  color: var(--sage);
  font-size: 1rem;
  letter-spacing: 0.05em;
  margin-bottom: 20px;
  display: inline-block;
  padding: 4px 14px;
  border: 1px solid var(--amber-soft);
  border-radius: 999px;
  background: rgba(255, 255, 255, 0.4);
}
.hero-text h1 {
  margin-bottom: 24px;
  position: relative;
}
.hero-text h1 .accent {
  color: var(--sage);
  position: relative;
  display: inline-block;
}
.hero-text h1 .accent::after {
  content: '';
  position: absolute;
  bottom: -4px; left: 0; right: 0;
  height: 8px;
  background: rgba(155, 143, 181, 0.25);
  border-radius: 4px;
  z-index: -1;
}
.hero-text .lede {
  font-size: 1.15rem;
  color: var(--walnut-soft);
  margin-bottom: 40px;
  max-width: 480px;
}

.hero-mascots {
  position: relative;
  height: 480px;
  display: flex;
  align-items: center;
  justify-content: center;
}
.mascot {
  position: absolute;
  width: 240px;
  height: auto;
  filter: drop-shadow(0 12px 32px rgba(61, 47, 31, 0.12));
  animation: gentle-float 7s var(--ease-watercolor) infinite;
}
.mascot.aurora {
  left: 10%;
  top: 18%;
  animation-delay: 0s;
}
.mascot.vesper {
  right: 5%;
  top: 28%;
  width: 260px;
  animation-delay: -3.5s;
}

@keyframes gentle-float {
  0%, 100% { transform: translateY(0) rotate(-1deg); }
  50% { transform: translateY(-18px) rotate(1deg); }
}

@media (max-width: 768px) {
  .hero-grid { grid-template-columns: 1fr; gap: 40px; text-align: center; }
  .hero-mascots { height: 360px; order: -1; }
  .mascot { width: 180px; }
  .mascot.aurora { left: 8%; top: 25%; }
  .mascot.vesper { right: 8%; top: 35%; width: 200px; }
}

/* ---------- CTA buttons ---------- */
.btn {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  padding: 14px 28px;
  border-radius: 999px;
  font-family: var(--font-sans);
  font-size: 0.98rem;
  font-weight: 500;
  cursor: pointer;
  transition: all 0.5s var(--ease-watercolor);
  border: 1.5px solid transparent;
  text-decoration: none;
}
.btn-primary {
  background: var(--sage);
  color: var(--cream);
}
.btn-primary:hover {
  background: var(--walnut);
  color: var(--cream);
  transform: translateY(-2px);
  box-shadow: 0 8px 24px rgba(61, 47, 31, 0.15);
}
.btn-ghost {
  background: transparent;
  color: var(--walnut);
  border-color: var(--amber);
}
.btn-ghost:hover {
  background: var(--cream);
  border-color: var(--walnut);
  color: var(--walnut);
}
.btn-row { display: flex; gap: 14px; flex-wrap: wrap; }
@media (max-width: 768px) { .btn-row { justify-content: center; } }

/* ---------- Section heading ---------- */
.section-head {
  text-align: center;
  max-width: 640px;
  margin: 0 auto 60px;
}
.section-head .kicker {
  font-family: var(--font-italic);
  font-style: italic;
  color: var(--lavender);
  letter-spacing: 0.04em;
  margin-bottom: 12px;
  display: block;
}
.section-head p { color: var(--walnut-soft); font-size: 1.05rem; }

/* ---------- Modes（三模式介紹）---------- */
.modes-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 24px;
}
.mode-card {
  background: var(--cream);
  border: 1px solid var(--amber-soft);
  border-radius: var(--radius-card);
  padding: 36px 28px;
  position: relative;
  transition: all 0.6s var(--ease-watercolor);
  overflow: hidden;
}
.mode-card::before {
  content: '';
  position: absolute;
  top: -40px; right: -40px;
  width: 140px; height: 140px;
  border-radius: 50%;
  filter: blur(40px);
  opacity: 0.35;
  transition: all 0.8s var(--ease-watercolor);
}
.mode-card.pure::before { background: var(--sage); }
.mode-card.romance::before { background: var(--lavender); }
.mode-card.both::before { background: var(--amber); }
.mode-card:hover {
  transform: translateY(-6px);
  box-shadow: var(--shadow-paper);
}
.mode-card:hover::before { opacity: 0.5; }
.mode-badge {
  font-family: var(--font-italic);
  font-style: italic;
  font-size: 0.85rem;
  padding: 3px 12px;
  border-radius: 999px;
  display: inline-block;
  margin-bottom: 16px;
  background: rgba(255, 255, 255, 0.5);
}
.mode-card.pure .mode-badge { color: var(--sage); border: 1px solid var(--sage-soft); }
.mode-card.romance .mode-badge { color: var(--lavender); border: 1px solid var(--lavender-soft); }
.mode-card.both .mode-badge { color: var(--walnut-soft); border: 1px solid var(--amber); }
.mode-card h3 {
  margin-bottom: 14px;
  position: relative;
}
.mode-card .tagline {
  font-family: var(--font-italic);
  font-style: italic;
  color: var(--walnut);
  font-size: 1.05rem;
  margin-bottom: 12px;
  line-height: 1.5;
}
.mode-card .desc { color: var(--walnut-soft); font-size: 0.95rem; }
@media (max-width: 768px) { .modes-grid { grid-template-columns: 1fr; } }

/* ---------- How it works（流程）---------- */
.flow {
  background: var(--cream);
  position: relative;
}
.flow-grid {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 32px;
  position: relative;
}
.flow-grid::before {
  content: '';
  position: absolute;
  top: 32px; left: 8%; right: 8%;
  height: 2px;
  background: repeating-linear-gradient(90deg, var(--amber) 0 6px, transparent 6px 12px);
  opacity: 0.5;
  z-index: 0;
}
.flow-step {
  position: relative;
  text-align: center;
  z-index: 1;
}
.flow-step .num {
  width: 64px;
  height: 64px;
  border-radius: 50%;
  background: var(--parchment);
  border: 2px solid var(--sage);
  color: var(--sage);
  font-family: var(--font-serif);
  font-size: 1.6rem;
  display: flex;
  align-items: center;
  justify-content: center;
  margin: 0 auto 20px;
  transition: all 0.6s var(--ease-watercolor);
}
.flow-step:nth-child(2) .num { border-color: var(--lavender); color: var(--lavender); }
.flow-step:nth-child(3) .num { border-color: var(--amber); color: var(--walnut); }
.flow-step:nth-child(4) .num { border-color: var(--sage); color: var(--sage); }
.flow-step:hover .num {
  background: var(--sage);
  color: var(--cream);
  transform: scale(1.05);
}
.flow-step:nth-child(2):hover .num { background: var(--lavender); color: var(--cream); }
.flow-step:nth-child(3):hover .num { background: var(--amber); }
.flow-step:nth-child(4):hover .num { background: var(--sage); color: var(--cream); }
.flow-step h3 { font-size: 1.1rem; margin-bottom: 8px; }
.flow-step p { font-size: 0.92rem; color: var(--walnut-soft); }
@media (max-width: 768px) {
  .flow-grid { grid-template-columns: repeat(2, 1fr); }
  .flow-grid::before { display: none; }
}
@media (max-width: 480px) { .flow-grid { grid-template-columns: 1fr; } }

/* ---------- Philosophy quote ---------- */
.philosophy {
  text-align: center;
  padding: 100px 0;
  position: relative;
}
.philosophy blockquote {
  max-width: 720px;
  margin: 0 auto;
  font-family: var(--font-serif);
  font-size: clamp(1.4rem, 3vw, 1.9rem);
  line-height: 1.7;
  color: var(--walnut);
  font-style: italic;
  position: relative;
}
.philosophy blockquote::before,
.philosophy blockquote::after {
  font-family: var(--font-italic);
  font-size: 4rem;
  color: var(--amber);
  line-height: 0;
  position: absolute;
  opacity: 0.6;
}
.philosophy blockquote::before { content: '"'; top: 20px; left: -10px; }
.philosophy blockquote::after { content: '"'; bottom: -20px; right: -10px; }
.philosophy cite {
  display: block;
  margin-top: 28px;
  font-style: normal;
  font-family: var(--font-sans);
  font-size: 0.9rem;
  color: var(--walnut-soft);
  letter-spacing: 0.05em;
}

/* ---------- 18+ notice ---------- */
.age-notice {
  background: var(--cream);
  border: 1px solid var(--amber);
  border-radius: var(--radius-card);
  padding: 32px;
  display: flex;
  gap: 24px;
  align-items: center;
  max-width: 720px;
  margin: 0 auto;
}
.age-notice .badge {
  flex: 0 0 auto;
  width: 64px; height: 64px;
  border-radius: 50%;
  background: var(--sage);
  color: var(--cream);
  display: flex;
  align-items: center;
  justify-content: center;
  font-family: var(--font-serif);
  font-size: 1.2rem;
}
.age-notice h3 { margin-bottom: 6px; }
.age-notice p { margin: 0; font-size: 0.95rem; }

/* ---------- Footer ---------- */
.footer {
  background: var(--walnut);
  color: var(--cream);
  padding: 60px 0 32px;
  margin-top: 60px;
}
.footer .container { max-width: 1100px; }
.footer-grid {
  display: grid;
  grid-template-columns: 2fr 1fr 1fr 1fr;
  gap: 40px;
  margin-bottom: 40px;
}
.footer-brand {
  display: flex;
  align-items: center;
  gap: 12px;
  margin-bottom: 16px;
  font-family: var(--font-serif);
  font-size: 1.3rem;
}
.footer-brand img { width: 32px; border-radius: 6px; }
.footer-tagline {
  font-family: var(--font-italic);
  font-style: italic;
  color: var(--amber-soft);
  font-size: 0.95rem;
  max-width: 300px;
}
.footer h4 {
  font-family: var(--font-sans);
  font-size: 0.85rem;
  letter-spacing: 0.1em;
  text-transform: uppercase;
  color: var(--amber-soft);
  margin-bottom: 16px;
}
.footer ul { list-style: none; }
.footer li { margin-bottom: 8px; }
.footer a {
  color: var(--cream);
  font-size: 0.92rem;
  opacity: 0.85;
  transition: opacity 0.4s var(--ease-watercolor);
}
.footer a:hover { opacity: 1; color: var(--amber-soft); }
.footer-bottom {
  border-top: 1px solid rgba(201, 184, 154, 0.2);
  padding-top: 24px;
  display: flex;
  justify-content: space-between;
  flex-wrap: wrap;
  gap: 12px;
  font-size: 0.82rem;
  color: var(--amber-soft);
  opacity: 0.7;
}
@media (max-width: 768px) {
  .footer-grid { grid-template-columns: 1fr 1fr; gap: 28px; }
}
@media (max-width: 480px) {
  .footer-grid { grid-template-columns: 1fr; }
}

/* ---------- Legal pages（terms / privacy）---------- */
.legal {
  padding-top: 140px;
  padding-bottom: 80px;
  max-width: 820px;
  margin: 0 auto;
}
.legal-header {
  margin-bottom: 48px;
  padding-bottom: 28px;
  border-bottom: 1px solid var(--amber-soft);
}
.legal-header .meta {
  font-family: var(--font-mono);
  font-size: 0.85rem;
  color: var(--walnut-soft);
  margin-bottom: 16px;
  display: flex;
  gap: 20px;
  flex-wrap: wrap;
}
.legal-header .meta span::before { content: '•'; margin-right: 8px; color: var(--amber); }
.legal-header .meta span:first-child::before { display: none; }
.legal h1 { margin-bottom: 8px; }
.legal-header .subtitle {
  font-family: var(--font-italic);
  font-style: italic;
  color: var(--lavender);
  font-size: 1.05rem;
}
.legal-banner {
  background: rgba(155, 143, 181, 0.1);
  border-left: 3px solid var(--lavender);
  padding: 20px 24px;
  border-radius: 8px;
  margin-bottom: 40px;
  font-size: 0.95rem;
  color: var(--walnut-soft);
}
.legal-banner strong { color: var(--walnut); }

.legal h2 {
  font-size: 1.4rem;
  margin-top: 48px;
  margin-bottom: 16px;
  padding-bottom: 12px;
  border-bottom: 1px solid var(--amber-soft);
}
.legal h2 .num {
  font-family: var(--font-italic);
  font-style: italic;
  color: var(--sage);
  margin-right: 12px;
  font-weight: 400;
}
.legal h3 {
  font-size: 1.05rem;
  margin-top: 24px;
  margin-bottom: 10px;
  color: var(--walnut);
}
.legal ul {
  list-style: none;
  padding-left: 0;
}
.legal ul li {
  padding-left: 24px;
  position: relative;
  margin-bottom: 10px;
  color: var(--walnut-soft);
  line-height: 1.7;
}
.legal ul li::before {
  content: '—';
  position: absolute;
  left: 0;
  color: var(--amber);
}
.legal ul ul {
  margin-top: 8px;
  margin-bottom: 8px;
}
.legal ul ul li::before { content: '·'; left: 6px; color: var(--lavender); }

.legal .draft-tag {
  display: inline-block;
  font-family: var(--font-mono);
  font-size: 0.7rem;
  padding: 2px 8px;
  background: var(--lavender);
  color: var(--cream);
  border-radius: 4px;
  margin-left: 8px;
  letter-spacing: 0.05em;
  vertical-align: middle;
}

.legal .toc {
  background: var(--cream);
  border: 1px solid var(--amber-soft);
  border-radius: var(--radius-soft);
  padding: 24px 28px;
  margin-bottom: 48px;
}
.legal .toc h4 {
  font-family: var(--font-sans);
  font-size: 0.78rem;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  color: var(--walnut-soft);
  margin-bottom: 12px;
}
.legal .toc ol {
  list-style: none;
  counter-reset: toc;
  columns: 2;
  column-gap: 32px;
}
.legal .toc li {
  counter-increment: toc;
  padding: 4px 0;
  font-size: 0.92rem;
  break-inside: avoid;
}
.legal .toc li::before {
  content: counter(toc, decimal-leading-zero);
  font-family: var(--font-mono);
  font-size: 0.78rem;
  color: var(--lavender);
  margin-right: 12px;
}
@media (max-width: 640px) {
  .legal .toc ol { columns: 1; }
  .legal { padding-top: 110px; }
}

/* ---------- Scroll-reveal ---------- */
.reveal {
  opacity: 0;
  transform: translateY(24px);
  transition: opacity 1.2s var(--ease-watercolor), transform 1.2s var(--ease-watercolor);
}
.reveal.visible {
  opacity: 1;
  transform: translateY(0);
}
.reveal-delay-1 { transition-delay: 0.15s; }
.reveal-delay-2 { transition-delay: 0.3s; }
.reveal-delay-3 { transition-delay: 0.45s; }

/* ---------- Decorative blob（背景水彩）---------- */
.blob {
  position: absolute;
  border-radius: 50%;
  filter: blur(60px);
  opacity: 0.25;
  pointer-events: none;
  z-index: -1;
  animation: blob-drift 18s var(--ease-watercolor) infinite;
}
.blob.b1 { width: 360px; height: 360px; background: var(--sage); top: -100px; right: -120px; }
.blob.b2 { width: 320px; height: 320px; background: var(--lavender); bottom: -100px; left: -100px; animation-delay: -8s; }
.blob.b3 { width: 280px; height: 280px; background: var(--pink); top: 40%; left: 50%; animation-delay: -14s; opacity: 0.18; }

@keyframes blob-drift {
  0%, 100% { transform: translate(0, 0) scale(1); }
  33% { transform: translate(30px, -20px) scale(1.05); }
  66% { transform: translate(-20px, 30px) scale(0.95); }
}

/* ---------- Reduced motion ---------- */
@media (prefers-reduced-motion: reduce) {
  *, *::before, *::after {
    animation-duration: 0.01ms !important;
    animation-iteration-count: 1 !important;
    transition-duration: 0.01ms !important;
    scroll-behavior: auto !important;
  }
  .reveal { opacity: 1; transform: none; }
}