/* ============================================
   MUZI GOING's AI LAB — Style System
   Apple-inspired minimalism × forest green
   Type scale: body 18px · max heading 35px (1.96×) · copyright 12px
   ============================================ */

:root {
  /* Colors */
  --bg: #FAFAF7;
  --bg-soft: #F2F2EC;
  --ink: #1A1D1A;
  --ink-soft: #4A4F4A;
  --ink-dim: #8A8F8A;
  --line: rgba(26, 29, 26, 0.08);
  --line-strong: rgba(26, 29, 26, 0.14);

  --green: #2D5F3F;
  --green-deep: #1F4530;
  --green-soft: #E8EFE9;
  --green-glow: rgba(45, 95, 63, 0.12);
  --moss: #7A9B76;
  --sand: #D9D3C3;

  /* Typography */
  --font-display: 'Fraunces', 'Noto Serif TC', Georgia, serif;
  --font-body: 'Noto Sans TC', -apple-system, BlinkMacSystemFont, 'SF Pro Text', system-ui, sans-serif;
  --font-logo: 'Montserrat', 'Helvetica Neue', -apple-system, BlinkMacSystemFont, sans-serif;

  /* ===== Type scale (single source of truth) =====
     基準內文 18px；展示型主標例外可更大；唯有版權可 12px */
  --fs-caption: 12px;                        /* 版權 / fine print（唯一可 <14px）*/
  --fs-label: 0.78rem;                       /* ~14px eyebrow / tag / pill / meta 標籤 */
  --fs-compact: 0.9rem;                      /* ~16px 密集元件（表格、說明框）*/
  --fs-body: 1rem;                           /* 18px 內文 / 描述（最小標準）*/
  --fs-lead: 1.16rem;                        /* ~21px 副標 / 導言 */
  --fs-h3: 1.45rem;                          /* ~26px 小節標題 */
  --fs-h2: clamp(1.5rem, 2.8vw, 1.94rem);    /* 27–35px 區段標題（內容最大標題）*/
  --fs-title: clamp(2.4rem, 5vw, 3.8rem);    /* 頁面主標（展示型，例外）*/
  --fs-hero: clamp(2.6rem, 7vw, 5.2rem);     /* 首頁 Hero（展示型，例外）*/

  /* Line height */
  --lh-tight: 1.15;
  --lh-body: 1.62;
  --lh-relaxed: 1.85;

  /* Radius */
  --radius-sm: 6px;
  --radius-md: 12px;
  --radius-lg: 16px;
  --radius-xl: 24px;
  --radius-pill: 999px;

  /* Motion */
  --ease-out: cubic-bezier(0.16, 1, 0.3, 1);
  --dur: 0.4s;

  /* Spacing */
  --max: 1280px;
  --gutter: clamp(1.25rem, 4vw, 3rem);
}

* { box-sizing: border-box; margin: 0; padding: 0; }

html { scroll-behavior: smooth; -webkit-text-size-adjust: 100%; font-size: 18px; }

body {
  font-family: var(--font-body);
  background: var(--bg);
  color: var(--ink);
  line-height: 1.62;
  font-weight: 400;
  font-size: 1rem;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
  overflow-x: hidden;
}

a { color: inherit; text-decoration: none; }

/* Nav / Footer 外殼樣式已移至 site-chrome.css（單一母本，所有頁面在 style.css 之前載入） */

/* ============ Hero ============ */
.hero {
  position: relative;
  padding: clamp(4rem, 9vw, 7rem) var(--gutter) clamp(1.5rem, 3.5vw, 3rem);
  max-width: var(--max);
  margin: 0 auto;
}
.hero-inner {
  position: relative;
  z-index: 2;
  max-width: 880px;
}
.eyebrow {
  font-size: 0.82rem;
  letter-spacing: 0.18em;
  text-transform: uppercase;
  color: var(--green);
  font-weight: 500;
  margin-bottom: 1.5rem;
}
.hero-title {
  font-family: var(--font-display);
  font-weight: 400;
  font-size: clamp(2.6rem, 7vw, 5.2rem);
  line-height: 1.05;
  letter-spacing: -0.025em;
  color: var(--ink);
  margin-bottom: 1.75rem;
  font-variation-settings: 'opsz' 144;
}
.hero-title em {
  font-style: italic;
  color: var(--green);
  font-variation-settings: 'opsz' 144, 'SOFT' 50;
}
.hero-sub {
  font-size: clamp(1rem, 1.3vw, 1.16rem);
  color: var(--ink-soft);
  max-width: 580px;
  line-height: 1.78;
  font-weight: 400;
  margin-bottom: 2.5rem;
}
.hero-meta {
  display: flex;
  align-items: center;
  gap: 0.9rem;
  font-size: 0.83rem;
  color: var(--ink-dim);
  letter-spacing: 0.04em;
}
.hero-meta .dot {
  width: 3px;
  height: 3px;
  border-radius: 50%;
  background: var(--ink-dim);
}

.hero-deco {
  position: absolute;
  top: -8%;
  right: -8%;
  width: 680px;
  height: 680px;
  border-radius: 50%;
  background: radial-gradient(circle at 42% 38%,
    rgba(122, 155, 118, 0.28),
    rgba(45, 95, 63, 0.12) 45%,
    rgba(45, 95, 63, 0.04) 65%,
    transparent 80%);
  filter: blur(30px);
  z-index: 0;
  pointer-events: none;
}

/* ============ Works ============ */
.works {
  max-width: var(--max);
  margin: 0 auto;
  padding: clamp(1rem, 2vw, 1.75rem) var(--gutter) clamp(5rem, 10vw, 8rem);
}
.works-header {
  display: flex;
  align-items: baseline;
  justify-content: space-between;
  margin-bottom: 2rem;
  padding-bottom: 0.5rem;
}
.section-title {
  font-family: var(--font-display);
  font-weight: 500;
  font-size: clamp(1.45rem, 2.6vw, 1.82rem);
  letter-spacing: -0.015em;
}
.section-sub {
  font-size: 0.83rem;
  letter-spacing: 0.18em;
  text-transform: uppercase;
  color: var(--ink-dim);
}

.grid {
  display: grid;
  grid-template-columns: repeat(6, 1fr);
  gap: 1.25rem;
}

.card {
  grid-column: span 3;
  background: #fff;
  border: 1px solid var(--line);
  border-radius: 24px;
  padding: 2rem 2rem 1.75rem;
  display: flex;
  flex-direction: column;
  gap: 1.5rem;
  min-height: 320px;
  position: relative;
  overflow: hidden;
  transition: transform 0.5s cubic-bezier(0.16, 1, 0.3, 1),
              border-color 0.4s ease,
              box-shadow 0.4s ease;
  cursor: pointer;
}

.card-large { grid-column: span 6; min-height: 360px; padding: 2.5rem; }
.card-wide { grid-column: span 6; min-height: 280px; padding: 2.25rem 2.5rem; }
.card-feature {
  grid-column: span 6;
  min-height: 320px;
  padding: 2.5rem;
  background: linear-gradient(135deg, var(--green-deep) 0%, var(--green) 100%);
  color: #fff;
  border-color: transparent;
}

.card::before {
  content: '';
  position: absolute;
  inset: 0;
  background: radial-gradient(circle at 100% 0%, var(--green-glow), transparent 50%);
  opacity: 0;
  transition: opacity 0.5s ease;
  pointer-events: none;
}
.card:hover {
  transform: translateY(-4px);
  border-color: var(--line-strong);
  box-shadow: 0 30px 60px -20px rgba(45, 95, 63, 0.18),
              0 12px 24px -12px rgba(0, 0, 0, 0.08);
}
.card:hover::before { opacity: 1; }
.card-feature:hover {
  box-shadow: 0 30px 60px -20px rgba(31, 69, 48, 0.5);
}
.card:hover .arrow { transform: translateX(6px); }

.card-num {
  font-family: var(--font-display);
  font-size: 0.9rem;
  font-weight: 400;
  letter-spacing: 0.12em;
  color: var(--ink-dim);
  font-feature-settings: 'tnum';
}
.card-feature .card-num { color: rgba(255,255,255,0.55); }

.card-body { flex: 1; display: flex; flex-direction: column; gap: 0.85rem; }
.card-tag {
  font-size: 0.8rem;
  letter-spacing: 0.14em;
  text-transform: uppercase;
  color: var(--green);
  font-weight: 500;
}
.card-feature .card-tag { color: rgba(232, 239, 233, 0.85); }

.card-title {
  font-family: var(--font-display);
  font-weight: 500;
  font-size: clamp(1.33rem, 2vw, 1.68rem);
  line-height: 1.2;
  letter-spacing: -0.015em;
  color: var(--ink);
}
.card-large .card-title { font-size: clamp(1.55rem, 2.6vw, 1.94rem); }
.card-feature .card-title { color: #fff; }

.card-desc {
  font-size: 1rem;
  line-height: 1.68;
  color: var(--ink-soft);
  font-weight: 400;
}
.card-feature .card-desc { color: rgba(255,255,255,0.82); }

.card-pages {
  display: flex;
  flex-wrap: wrap;
  gap: 0.5rem;
  margin-top: 0.5rem;
}
.page-pill {
  font-size: 0.82rem;
  padding: 0.35rem 0.8rem;
  background: var(--green-soft);
  color: var(--green-deep);
  border-radius: 999px;
  font-weight: 500;
  letter-spacing: 0.02em;
}
.card-feature .page-pill {
  background: rgba(255,255,255,0.14);
  color: #fff;
  backdrop-filter: blur(10px);
}

.card-foot {
  display: flex;
  align-items: center;
  justify-content: space-between;
  font-size: 1rem;
  color: var(--ink);
  font-weight: 500;
  letter-spacing: 0.01em;
}
.card-feature .card-foot { color: #fff; }
.arrow {
  display: inline-block;
  transition: transform 0.4s cubic-bezier(0.16, 1, 0.3, 1);
  font-size: 1.2rem;
}

/* ============ About ============ */
.about {
  background: var(--bg-soft);
  padding: clamp(5rem, 10vw, 8rem) var(--gutter);
  border-top: 1px solid var(--line);
}
.about-inner {
  max-width: var(--max);
  margin: 0 auto;
  display: grid;
  grid-template-columns: 1fr 1.5fr;
  gap: clamp(2rem, 5vw, 5rem);
  align-items: start;
}
.about .eyebrow { grid-column: 1; margin-bottom: 0; }
.about-title {
  grid-column: 2;
  font-family: var(--font-display);
  font-weight: 500;
  font-size: clamp(1.5rem, 2.8vw, 1.94rem);
  line-height: 1.3;
  letter-spacing: -0.015em;
  margin-bottom: 1.75rem;
}
.about-text {
  grid-column: 2;
  font-size: 1.08rem;
  line-height: 1.85;
  color: var(--ink-soft);
  font-weight: 400;
  max-width: 640px;
}

/* ============ Project Detail Pages ============ */
.project-page {
  max-width: 1080px;
  margin: 0 auto;
  padding: clamp(3rem, 7vw, 5rem) var(--gutter) clamp(5rem, 10vw, 7rem);
}
.back-link {
  display: inline-flex;
  align-items: center;
  gap: 0.5rem;
  font-size: 1rem;
  color: var(--ink-soft);
  margin-bottom: 2.5rem;
  transition: color 0.3s ease;
}
.back-link:hover { color: var(--green); }
.back-arrow { transition: transform 0.3s ease; }
.back-link:hover .back-arrow { transform: translateX(-4px); }

.project-header { margin-bottom: 3.5rem; }
.project-tag {
  font-size: 0.82rem;
  letter-spacing: 0.16em;
  text-transform: uppercase;
  color: var(--green);
  font-weight: 500;
  margin-bottom: 1rem;
}
.project-title {
  font-family: var(--font-display);
  font-weight: 500;
  font-size: clamp(2.4rem, 5vw, 3.8rem);
  line-height: 1.1;
  letter-spacing: -0.02em;
  margin-bottom: 1.25rem;
}
.project-sub {
  font-size: clamp(1rem, 1.3vw, 1.16rem);
  line-height: 1.72;
  color: var(--ink-soft);
  font-weight: 400;
  max-width: 720px;
}

.project-grid {
  display: grid;
  grid-template-columns: 1fr 2fr;
  gap: clamp(2rem, 5vw, 4rem);
  margin-bottom: 4rem;
}
.project-meta {
  display: flex;
  flex-direction: column;
  gap: 1.5rem;
}
.meta-item {
  border-top: 1px solid var(--line);
  padding-top: 1rem;
}
.meta-label {
  font-size: 0.78rem;
  letter-spacing: 0.14em;
  text-transform: uppercase;
  color: var(--ink-dim);
  margin-bottom: 0.4rem;
}
.meta-value {
  font-size: 1rem;
  color: var(--ink);
  line-height: 1.6;
}
.tag-row { display: flex; flex-wrap: wrap; gap: 0.4rem; }
.tag {
  font-size: 0.82rem;
  padding: 0.3rem 0.75rem;
  background: var(--green-soft);
  color: var(--green-deep);
  border-radius: 999px;
  font-weight: 500;
}

.project-content {
  font-size: 1.05rem;
  line-height: 1.85;
  color: var(--ink-soft);
}
.project-content h3 {
  font-family: var(--font-display);
  font-weight: 500;
  font-size: 1.45rem;
  color: var(--ink);
  margin: 2rem 0 1rem;
  letter-spacing: -0.01em;
}
.project-content h3:first-child { margin-top: 0; }
.project-content p { margin-bottom: 1.15rem; }

.launch-section {
  margin-top: 3.5rem;
  padding: 2.5rem;
  background: var(--bg-soft);
  border-radius: 24px;
  border: 1px solid var(--line);
}
.launch-title {
  font-family: var(--font-display);
  font-size: 1.45rem;
  font-weight: 500;
  margin-bottom: 0.5rem;
  letter-spacing: -0.01em;
}
.launch-sub {
  color: var(--ink-dim);
  font-size: 1rem;
  margin-bottom: 1.75rem;
}
.launch-buttons {
  display: flex;
  flex-wrap: wrap;
  gap: 0.85rem;
}
.btn {
  display: inline-flex;
  align-items: center;
  gap: 0.6rem;
  padding: 0.95rem 1.5rem;
  background: var(--ink);
  color: var(--bg);
  border-radius: 999px;
  font-size: 1rem;
  font-weight: 500;
  letter-spacing: 0.01em;
  transition: all 0.3s ease;
  border: 1px solid var(--ink);
}
.btn:hover {
  background: var(--green-deep);
  border-color: var(--green-deep);
  transform: translateY(-2px);
}
.btn-secondary {
  background: transparent;
  color: var(--ink);
  border-color: var(--line-strong);
}
.btn-secondary:hover {
  background: #fff;
  color: var(--green-deep);
  border-color: var(--green);
}
.btn-icon { font-size: 1.1rem; }
.btn-arrow {
  font-size: 1.05rem;
  transition: transform 0.3s ease;
}
.btn:hover .btn-arrow { transform: translate(2px, -2px); }

/* ============ Responsive ============ */
/* 全站擋掉水平溢出（hero-deco 等裝飾元素不會撐出左右捲動） */
html, body { overflow-x: hidden; }

@media (max-width: 860px) {
  .grid { grid-template-columns: 1fr; }
  .card,
  .card-large,
  .card-wide,
  .card-feature { grid-column: span 1; min-height: auto; }
  .hero-deco { width: 320px; height: 320px; right: -25%; }
  .about-inner { grid-template-columns: 1fr; }
  .about .eyebrow,
  .about-title,
  .about-text { grid-column: 1; }
  .project-grid { grid-template-columns: 1fr; }
  .works-header { flex-direction: column; align-items: flex-start; gap: 0.5rem; }
}

/* ============ Page entrance ============ */
@keyframes fadeUp {
  from { opacity: 0; transform: translateY(20px); }
  to { opacity: 1; transform: translateY(0); }
}
.hero-inner > * {
  animation: fadeUp 0.9s cubic-bezier(0.16, 1, 0.3, 1) backwards;
}
.hero-inner > *:nth-child(1) { animation-delay: 0.05s; }
.hero-inner > *:nth-child(2) { animation-delay: 0.15s; }
.hero-inner > *:nth-child(3) { animation-delay: 0.25s; }
.hero-inner > *:nth-child(4) { animation-delay: 0.35s; }

.card {
  animation: fadeUp 0.7s cubic-bezier(0.16, 1, 0.3, 1) backwards;
}
.card:nth-child(1) { animation-delay: 0.1s; }
.card:nth-child(2) { animation-delay: 0.18s; }
.card:nth-child(3) { animation-delay: 0.26s; }
.card:nth-child(4) { animation-delay: 0.34s; }
.card:nth-child(5) { animation-delay: 0.42s; }