/* ============================================================
   PFAP v4 · Shared Stylesheet
   奶油白為主 · 暖光調 · 字級節制 · 編輯式克制
   ============================================================ */

:root {
  /* 主色系 - 奶油白為主,深色克制 */
  --cream: #faf6ec;
  --cream-soft: #f5efe0;
  --cream-warm: #ede4cf;
  --cream-deep: #ddd0b3;
  --wood-light: #d4bfa0;
  --wood: #b8956b;
  --wood-deep: #8a6b42;
  --ink: #2d2419;       /* 暖咖啡黑 */
  --ink-deep: #1f1810;
  --ink-soft: #4a3e2d;
  --text: #3a2f22;
  --text-muted: #6b5a45;
  --text-soft: #8a7860;
  --accent: #b08a4e;
  --accent-soft: #c9a574;
  --accent-line: rgba(176, 138, 78, 0.4);
  --line: rgba(45, 36, 25, 0.1);
  --line-soft: rgba(45, 36, 25, 0.05);
  --line-on-dark: rgba(245, 239, 224, 0.1);

  --font-display: 'Cormorant Garamond', 'Noto Serif TC', serif;
  --font-cn-display: 'Noto Serif TC', serif;
  --font-sans: 'Inter', 'Noto Sans TC', -apple-system, sans-serif;
  --font-cn: 'Noto Sans TC', -apple-system, sans-serif;

  --section-y: clamp(56px, 7vw, 88px);
  --section-y-sm: clamp(40px, 5vw, 64px);
  --container: 1320px;
  --container-narrow: 880px;
  --gutter: clamp(24px, 5vw, 56px);

  --ease-out: cubic-bezier(0.16, 1, 0.3, 1);
  --ease-in-out: cubic-bezier(0.65, 0, 0.35, 1);
}

* { box-sizing: border-box; margin: 0; padding: 0; }
html { scroll-behavior: smooth; -webkit-text-size-adjust: 100%; }
body {
  font-family: var(--font-sans);
  background: var(--cream);
  color: var(--text);
  line-height: 1.85;
  font-weight: 400;
  letter-spacing: 0.015em;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
  overflow-x: hidden;
}
p { line-height: 1.95; }
.body-text p { margin-bottom: 18px; line-height: 2.0; }
.body-text p:last-child { margin-bottom: 0; }
img { max-width: 100%; display: block; }
a { color: inherit; text-decoration: none; }
button { font: inherit; cursor: pointer; border: none; background: none; color: inherit; }

.container { max-width: var(--container); margin: 0 auto; padding: 0 var(--gutter); }
.container-narrow { max-width: var(--container-narrow); margin: 0 auto; padding: 0 var(--gutter); }

/* ========== Typography 縮減 ========== */
.chapter-label { font-family: var(--font-display); font-style: italic; font-size: 13px; letter-spacing: 0.08em; color: var(--accent); }
.chapter-label-light { color: var(--accent-soft); }
.eyebrow { font-family: var(--font-sans); font-size: 11px; font-weight: 500; letter-spacing: 0.32em; text-transform: uppercase; color: var(--ink-soft); }
.eyebrow.on-dark { color: var(--accent-soft); }

.mega-title { font-family: var(--font-cn-display); font-size: clamp(42px, 6vw, 80px); font-weight: 400; line-height: 1.1; letter-spacing: -0.02em; color: var(--ink); }
.mega-title.on-dark { color: var(--cream); }
.section-title-xl { font-family: var(--font-cn-display); font-size: clamp(36px, 4.5vw, 56px); font-weight: 400; line-height: 1.15; letter-spacing: -0.02em; color: var(--ink); }
.section-title-xl.on-dark { color: var(--cream); }
.section-title { font-family: var(--font-cn-display); font-size: clamp(28px, 3.5vw, 44px); font-weight: 400; line-height: 1.2; letter-spacing: -0.01em; color: var(--ink); }
.section-title.on-dark { color: var(--cream); }
.display-en { font-family: var(--font-display); font-weight: 400; font-style: italic; letter-spacing: -0.01em; color: var(--accent); }
.display-en.on-dark { color: var(--accent-soft); }

.lead-text { font-family: var(--font-cn); font-size: clamp(15px, 1.2vw, 17px); color: var(--text); line-height: 1.95; font-weight: 400; }
.lead-text.on-dark { color: rgba(250, 246, 236, 0.85); }
.lead-intro { font-family: var(--font-cn); font-size: 14px; color: var(--text-muted); line-height: 1.7; max-width: 600px; margin-top: 12px; }
.body-text { font-family: var(--font-cn); font-size: 15px; color: var(--text); line-height: 2; }
.body-text strong { color: var(--ink); font-weight: 600; }
.body-text p { margin-bottom: 24px; }
.body-text p:last-child { margin-bottom: 0; }

/* ========== Reveal ========== */
.reveal { opacity: 0; transform: translateY(32px); transition: opacity 1.2s var(--ease-out), transform 1.2s var(--ease-out); }
.reveal.in { opacity: 1; transform: translateY(0); }
.reveal-delay-1 { transition-delay: 0.12s; }
.reveal-delay-2 { transition-delay: 0.24s; }
.reveal-delay-3 { transition-delay: 0.36s; }
.reveal-delay-4 { transition-delay: 0.48s; }

/* ========== Chapter Header ========== */
.chapter-header { display: grid; grid-template-columns: 140px 1fr; gap: 40px; margin-bottom: 48px; align-items: start; }
@media (max-width: 880px) { .chapter-header { grid-template-columns: 1fr; gap: 16px; margin-bottom: 32px; } }
.chapter-header-side { padding-top: 6px; }
.chapter-header-side-line { width: 48px; height: 1px; background: var(--accent); margin-bottom: 20px; }
.chapter-header-side.on-dark .chapter-header-side-line { background: var(--accent-soft); }
.chapter-header-num { font-family: var(--font-display); font-style: italic; font-size: 22px; color: var(--accent); margin-bottom: 6px; }
.chapter-header-side.on-dark .chapter-header-num { color: var(--accent-soft); }
.chapter-header-en { font-family: var(--font-sans); font-size: 11px; letter-spacing: 0.28em; text-transform: uppercase; color: var(--ink-soft); }
.chapter-header-side.on-dark .chapter-header-en { color: rgba(250, 246, 236, 0.55); }
.chapter-header-main { max-width: 760px; }

/* ========== Navigation ========== */
.nav { position: fixed; top: 0; left: 0; right: 0; z-index: 100; padding: 22px var(--gutter); background: transparent; transition: all 0.4s var(--ease-out); }
.nav.scrolled, .nav.solid { background: rgba(250, 246, 236, 0.94); backdrop-filter: blur(16px); padding: 14px var(--gutter); border-bottom: 1px solid var(--line-soft); }

.nav.on-hero:not(.scrolled),
.nav.on-image:not(.scrolled) { background: linear-gradient(to bottom, rgba(20, 16, 10, 0.55), transparent); }
.nav.on-hero:not(.scrolled) .logo,
.nav.on-hero:not(.scrolled) .nav-link,
.nav.on-hero:not(.scrolled) .nav-dropdown-trigger,
.nav.on-hero:not(.scrolled) .nav-cta,
.nav.on-hero:not(.scrolled) .nav-toggle,
.nav.on-image:not(.scrolled) .logo,
.nav.on-image:not(.scrolled) .nav-link,
.nav.on-image:not(.scrolled) .nav-dropdown-trigger,
.nav.on-image:not(.scrolled) .nav-cta,
.nav.on-image:not(.scrolled) .nav-toggle { color: var(--cream); }
.nav.on-hero:not(.scrolled) .nav-cta,
.nav.on-image:not(.scrolled) .nav-cta { border-color: var(--cream); }
.nav.on-hero:not(.scrolled) .nav-cta:hover,
.nav.on-image:not(.scrolled) .nav-cta:hover { background: var(--cream); color: var(--ink); }

.nav.on-dark:not(.scrolled) { background: transparent; }
.nav.on-dark:not(.scrolled) .logo,
.nav.on-dark:not(.scrolled) .nav-link,
.nav.on-dark:not(.scrolled) .nav-cta,
.nav.on-dark:not(.scrolled) .nav-toggle { color: var(--cream); }
.nav.on-dark:not(.scrolled) .nav-cta { border-color: var(--cream); }

.nav-inner { max-width: var(--container); margin: 0 auto; display: flex; align-items: center; justify-content: space-between; }
.logo { font-family: var(--font-display); font-size: 22px; font-weight: 500; letter-spacing: 0.04em; color: var(--ink); display: flex; align-items: center; gap: 10px; transition: color 0.3s; }
.logo-mark { height: 36px; width: auto; display: block; transition: opacity 0.3s; }
/* 預設:亮色背景顯示深色 logo,深色背景顯示白色 logo */
.logo-mark-light { display: none; } /* 亮色背景時隱藏白色版 */
.nav.on-hero:not(.scrolled) .logo-mark-dark { display: none; }
.nav.on-hero:not(.scrolled) .logo-mark-light { display: block; }
.nav-links { display: flex; gap: 40px; align-items: center; }
.nav-link { font-size: 13px; font-weight: 400; letter-spacing: 0.04em; color: var(--ink); position: relative; padding: 6px 0; transition: color 0.3s; }
.nav-link.active { color: var(--accent); }
.nav-link::after { content: ''; position: absolute; bottom: 0; left: 0; width: 0; height: 1px; background: currentColor; transition: width 0.5s var(--ease-out); }
.nav-link.active::after, .nav-link:hover::after { width: 100%; }
.nav-cta { padding: 10px 20px; border: 1px solid currentColor; border-radius: 100px; font-size: 12px; font-weight: 400; letter-spacing: 0.08em; color: var(--ink); transition: all 0.4s var(--ease-out); }
.nav-cta:hover { background: var(--ink); color: var(--cream); border-color: var(--ink); }

/* ========== Nav Dropdown ========== */
.nav-dropdown { position: relative; }
.nav-dropdown-trigger {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  cursor: pointer;
  font-size: 13px;
  font-weight: 400;
  letter-spacing: 0.04em;
  color: var(--ink);
  position: relative;
  padding: 6px 0;
  transition: color 0.3s;
  background: none;
  border: none;
}
.nav-dropdown-trigger.active { color: var(--accent); }
.nav-dropdown-trigger::after {
  content: '';
  position: absolute;
  bottom: 0;
  left: 0;
  width: 0;
  height: 1px;
  background: currentColor;
  transition: width 0.5s var(--ease-out);
}
.nav-dropdown:hover .nav-dropdown-trigger::after,
.nav-dropdown-trigger.active::after { width: 100%; }
.nav-dropdown-arrow {
  font-size: 9px;
  margin-top: 1px;
  transition: transform 0.3s;
}
.nav-dropdown:hover .nav-dropdown-arrow { transform: rotate(180deg); }

.nav-dropdown-menu {
  position: absolute;
  top: calc(100% + 14px);
  left: 50%;
  transform: translateX(-50%) translateY(-8px);
  min-width: 200px;
  background: var(--cream);
  border: 1px solid var(--line);
  padding: 8px 0;
  opacity: 0;
  visibility: hidden;
  transition: all 0.3s var(--ease-out);
  box-shadow: 0 12px 32px rgba(45, 36, 25, 0.1);
  z-index: 105;
}
.nav-dropdown:hover .nav-dropdown-menu,
.nav-dropdown:focus-within .nav-dropdown-menu {
  opacity: 1;
  visibility: visible;
  transform: translateX(-50%) translateY(0);
}
.nav-dropdown-menu::before {
  content: '';
  position: absolute;
  top: -8px;
  left: 0;
  right: 0;
  height: 8px;
}
.nav-dropdown-link {
  display: block;
  padding: 12px 24px;
  font-family: var(--font-cn);
  font-size: 13px;
  color: var(--ink);
  letter-spacing: 0.02em;
  transition: all 0.2s;
  white-space: nowrap;
  text-align: center;
}
.nav-dropdown-link:hover {
  background: var(--cream-soft);
  color: var(--accent);
}
.nav-dropdown-link.active {
  color: var(--accent);
  background: var(--cream-soft);
}

/* Mobile dropdown — flatten */
@media (max-width: 880px) {
  .nav-dropdown-trigger { font-size: 17px; pointer-events: none; }
  .nav-dropdown-arrow { display: none; }
  .nav-dropdown-menu {
    position: static;
    transform: none;
    opacity: 1;
    visibility: visible;
    box-shadow: none;
    border: none;
    background: transparent;
    padding: 0;
    margin-top: 16px;
    margin-left: 16px;
    min-width: auto;
  }
  .nav-dropdown-link { padding: 8px 0; text-align: left; font-size: 15px; color: var(--text-muted); }
}

.nav-toggle { display: none; width: 22px; height: 22px; flex-direction: column; justify-content: center; gap: 5px; }
.nav-toggle span { display: block; width: 100%; height: 1px; background: currentColor; transition: all 0.3s; }
@media (max-width: 880px) {
  .nav-links { position: fixed; top: 0; right: 0; width: 80%; max-width: 340px; height: 100vh; background: var(--cream); flex-direction: column; align-items: flex-start; gap: 28px; padding: 100px 40px 40px; transform: translateX(100%); transition: transform 0.5s var(--ease-out); box-shadow: -8px 0 32px rgba(45, 36, 25, 0.1); }
  .nav-links.open { transform: translateX(0); }
  .nav-link, .nav.on-image:not(.scrolled) .nav-link, .nav.on-dark:not(.scrolled) .nav-link { font-size: 17px; color: var(--ink); }
  .nav-cta, .nav.on-image:not(.scrolled) .nav-cta, .nav.on-dark:not(.scrolled) .nav-cta { color: var(--ink); border-color: var(--ink); }
  .nav-toggle { display: flex; z-index: 102; position: relative; }
  .nav-toggle.open span:nth-child(1) { transform: translateY(6px) rotate(45deg); }
  .nav-toggle.open span:nth-child(2) { opacity: 0; }
  .nav-toggle.open span:nth-child(3) { transform: translateY(-6px) rotate(-45deg); }
}

/* ========== Buttons ========== */
.btn-primary { display: inline-flex; align-items: center; gap: 12px; padding: 16px 30px; background: var(--ink); color: var(--cream); border-radius: 100px; font-size: 13px; font-weight: 400; letter-spacing: 0.06em; transition: all 0.4s var(--ease-out); }
.btn-primary:hover { background: var(--ink-deep); transform: translateY(-2px); box-shadow: 0 8px 24px rgba(45, 36, 25, 0.18); }
.btn-primary .arrow { transition: transform 0.4s var(--ease-out); font-family: var(--font-display); font-style: italic; }
.btn-primary:hover .arrow { transform: translateX(6px); }

.btn-outline { display: inline-flex; align-items: center; gap: 12px; padding: 16px 30px; border: 1px solid var(--ink); color: var(--ink); border-radius: 100px; font-size: 13px; font-weight: 400; letter-spacing: 0.06em; transition: all 0.4s var(--ease-out); background: transparent; }
.btn-outline:hover { background: var(--ink); color: var(--cream); }
.btn-outline .arrow { font-family: var(--font-display); font-style: italic; transition: transform 0.4s var(--ease-out); }
.btn-outline:hover .arrow { transform: translateX(6px); }

.btn-ghost-cream { display: inline-flex; align-items: center; gap: 12px; padding: 16px 30px; border: 1px solid rgba(250, 246, 236, 0.4); color: var(--cream); border-radius: 100px; font-size: 13px; font-weight: 400; letter-spacing: 0.06em; transition: all 0.4s var(--ease-out); }
.btn-ghost-cream:hover { border-color: var(--cream); background: rgba(250, 246, 236, 0.1); }
.btn-ghost-cream .arrow { font-family: var(--font-display); font-style: italic; transition: transform 0.4s var(--ease-out); }
.btn-ghost-cream:hover .arrow { transform: translateX(6px); }

.link-arrow { display: inline-flex; align-items: center; gap: 10px; font-family: var(--font-sans); font-size: 13px; font-weight: 400; letter-spacing: 0.08em; color: var(--ink); border-bottom: 1px solid currentColor; padding-bottom: 4px; transition: gap 0.4s var(--ease-out); }
.link-arrow:hover { gap: 16px; color: var(--accent); }
.link-arrow .a { font-family: var(--font-display); font-style: italic; font-size: 14px; }

/* ========== Forms ========== */
.form-row { margin-bottom: 22px; }
.form-label { display: block; font-size: 11px; color: var(--text-muted); letter-spacing: 0.16em; text-transform: uppercase; margin-bottom: 10px; font-weight: 400; }
.form-input, .form-select { width: 100%; padding: 14px 0; border: 0; border-bottom: 1px solid var(--line); background: transparent; font-family: var(--font-cn); font-size: 15px; color: var(--ink); border-radius: 0; transition: border-color 0.3s; }
.form-input:focus, .form-select:focus { outline: none; border-bottom-color: var(--accent); }
.form-input::placeholder { color: var(--text-soft); }
textarea.form-input { min-height: 110px; resize: vertical; }
.form-submit { padding: 16px 32px; background: var(--ink); color: var(--cream); border-radius: 100px; font-size: 13px; font-weight: 400; letter-spacing: 0.08em; margin-top: 12px; transition: all 0.4s var(--ease-out); }
.form-submit:hover { background: var(--ink-deep); transform: translateY(-2px); }
.form-row-2 { display: grid; grid-template-columns: 1fr 1fr; gap: 28px; }
@media (max-width: 600px) { .form-row-2 { grid-template-columns: 1fr; } }

/* ========== Footer 深色保留 ========== */
/* ========== Footer 亮色版 ========== */
.footer { background: var(--cream-warm); color: var(--text-muted); padding: 56px 0 24px; border-top: 1px solid var(--line); }
.footer-inner { display: grid; grid-template-columns: 2.5fr 1fr 1fr; gap: 56px; margin-bottom: 40px; }
@media (max-width: 880px) { .footer-inner { grid-template-columns: 1fr; gap: 44px; margin-bottom: 44px; } }
.footer-brand { display: flex; align-items: center; gap: 16px; margin-bottom: 14px; }
.footer-brand img { width: 64px; height: 64px; display: block; }
.footer-brand-text { font-family: var(--font-display); font-style: italic; font-size: 22px; color: var(--ink); letter-spacing: 0.02em; font-weight: 500; }
.footer-text { font-family: var(--font-cn); font-size: 13px; line-height: 1.95; color: var(--text-muted); }
.footer-text-en { font-family: var(--font-display); font-style: italic; color: var(--accent); margin-top: 4px; display: block; }
.footer-h { color: var(--ink); font-family: var(--font-display); font-size: 16px; margin-bottom: 16px; font-weight: 500; font-style: italic; }
.footer-links { list-style: none; }
.footer-links li { margin-bottom: 10px; }
.footer-links a { font-size: 13px; transition: color 0.3s; font-family: var(--font-cn); color: var(--text); }
.footer-links a:hover { color: var(--accent); }
.footer-bottom { padding-top: 24px; border-top: 1px solid var(--line); display: flex; justify-content: space-between; flex-wrap: wrap; gap: 16px; font-size: 11px; color: var(--text-soft); letter-spacing: 0.04em; }
.footer-bottom em { font-family: var(--font-display); font-style: italic; color: var(--accent); }

/* ========== Scroll Progress ========== */
.scroll-bar { position: fixed; top: 0; left: 0; height: 1px; background: var(--accent); z-index: 200; width: 0%; }

/* ========== Sub-page Hero - 亮色 ========== */
.subhero { background: var(--cream-soft); color: var(--ink); padding: 110px 0 56px; position: relative; overflow: hidden; border-bottom: 1px solid var(--line); }
@media (max-width: 880px) { .subhero { padding: 96px 0 44px; } }
.subhero-inner { position: relative; z-index: 1; }
.subhero-meta { display: flex; gap: 24px; align-items: center; margin-bottom: 28px; }
.subhero-bc { font-size: 11px; color: var(--text-muted); letter-spacing: 0.16em; }
.subhero-bc a { color: var(--ink); transition: color 0.3s; }
.subhero-bc a:hover { color: var(--accent); }
.subhero-chapter { font-family: var(--font-display); font-style: italic; font-size: 14px; color: var(--accent); padding-left: 24px; border-left: 1px solid var(--line); }
.subhero-eyebrow { font-size: 11px; font-weight: 500; letter-spacing: 0.28em; text-transform: uppercase; color: var(--accent); margin-bottom: 24px; }
.subhero-title { font-family: var(--font-cn-display); font-size: clamp(36px, 5vw, 64px); font-weight: 400; line-height: 1.05; letter-spacing: -0.02em; color: var(--ink); margin-bottom: 16px; }
.subhero-title-en { font-family: var(--font-display); font-style: italic; font-weight: 400; color: var(--accent); font-size: clamp(22px, 2.6vw, 32px); display: block; margin-top: 6px; letter-spacing: -0.01em; }
.subhero-lead { font-family: var(--font-cn); font-size: clamp(14px, 1.1vw, 15px); line-height: 1.9; color: var(--text); max-width: 580px; margin-top: 32px; padding-top: 20px; border-top: 1px solid var(--line); }

/* ========== Page Section ========== */
.page-section { padding: var(--section-y) 0; }
.page-section.sm { padding: var(--section-y-sm) 0; }
.page-section.alt { background: var(--cream-soft); }
.page-section.warm { background: var(--cream-warm); }
.page-section.dark { background: var(--ink); color: var(--cream); }
.page-section.deep { background: var(--ink-deep); color: var(--cream); }
.page-section.dark .body-text { color: rgba(250, 246, 236, 0.8); }
.page-section.dark .body-text strong { color: var(--cream); }

/* ========== Filing Bar 亮色 ========== */
.filing-bar { background: var(--cream-warm); border-top: 1px solid var(--line); border-bottom: 1px solid var(--line); color: var(--text); padding: 22px 0; font-size: 11px; }
.filing-bar-inner { max-width: var(--container); margin: 0 auto; padding: 0 var(--gutter); display: flex; justify-content: space-between; flex-wrap: wrap; gap: 20px; align-items: center; }
.filing-bar-item { display: flex; align-items: center; gap: 14px; }
.filing-bar-label { font-family: var(--font-display); font-style: italic; font-size: 13px; color: var(--accent); letter-spacing: 0.04em; }
.filing-bar-value { font-family: var(--font-cn); color: var(--ink); letter-spacing: 0.04em; }

@keyframes fadeUp { from { opacity: 0; transform: translateY(32px); } to { opacity: 1; transform: translateY(0); } }
@keyframes fadeIn { from { opacity: 0; } to { opacity: 1; } }

.gold-line { width: 60px; height: 1px; background: var(--accent); display: block; }
.gold-line-vert { width: 1px; height: 60px; background: var(--accent); display: block; }
.gold-mark { font-family: var(--font-display); font-style: italic; color: var(--accent); font-size: 14px; }