/* ============================================================
   極心流能量工作室・Site CSS
   水墨米白 + 沉金 + 朱砂 + 墨黑
   ============================================================ */

:root {
  /* Surfaces */
  --paper:        #f5f1e8;  /* 米白宣紙 */
  --paper-warm:   #efe9dc;  /* 暖米 */
  --paper-deep:   #ebe3d1;
  --ivory:        #faf7ef;  /* 象牙白 */
  --ink:          #2b2a26;  /* 墨黑 */
  --ink-deep:     #1a1916;  /* 深墨 */
  --ink-soft:     #4a4842;
  --ink-mute:     #7a7670;
  --ink-faint:    #a8a39a;

  /* Accents */
  --gold:         #a07e3b;  /* 沉金 */
  --gold-deep:    #7a5d24;
  --gold-light:   #c9a96a;  /* 淺金 */
  --bamboo:       #4a6157;  /* 竹青 */
  --bamboo-deep:  #2f4138;
  --cinnabar:     #a44d3a;  /* 朱砂印章 */
  --cinnabar-deep:#822f1f;

  /* Lines */
  --line:         #d6cdb8;
  --line-soft:    #e6dfcd;

  /* Type */
  --serif-tc: "Noto Serif TC", "Source Han Serif TC", "PMingLiU", serif;
  --sans-tc:  "Noto Sans TC", "PingFang TC", "Microsoft JhengHei", sans-serif;
  --serif-en: "Cormorant Garamond", "EB Garamond", Georgia, serif;
  --sans-en:  "Cormorant Garamond", Georgia, serif;

  /* Motion */
  --ease: cubic-bezier(0.22, 1, 0.36, 1);
}

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

html { scroll-behavior: smooth; }
body {
  font-family: var(--serif-tc);
  font-weight: 400;
  background: var(--paper);
  color: var(--ink);
  line-height: 1.75;
  font-size: 16px;
  -webkit-font-smoothing: antialiased;
  text-rendering: optimizeLegibility;
}

a { color: inherit; text-decoration: none; }
img { max-width: 100%; display: block; }
button { font-family: inherit; cursor: pointer; border: none; background: none; color: inherit; }
input, select, textarea { font-family: inherit; font-size: inherit; color: inherit; }

/* Subtle paper texture overlay */
body::before {
  content: '';
  position: fixed; inset: 0;
  pointer-events: none;
  z-index: 1;
  background-image: url("data:image/svg+xml;utf8,<svg xmlns='http://www.w3.org/2000/svg' width='240' height='240'><filter id='n'><feTurbulence type='fractalNoise' baseFrequency='0.85' numOctaves='2' seed='3'/><feColorMatrix values='0 0 0 0 0.16  0 0 0 0 0.15  0 0 0 0 0.13  0 0 0 0.045 0'/></filter><rect width='100%25' height='100%25' filter='url(%23n)'/></svg>");
  opacity: 0.6;
  mix-blend-mode: multiply;
}

/* ============ Typography ============ */
.serif-en { font-family: var(--serif-en); font-style: italic; }
.eyebrow {
  font-family: var(--serif-en);
  font-style: italic;
  font-size: 14px;
  letter-spacing: 0.18em;
  color: var(--gold-deep);
  text-transform: uppercase;
}
.section-title {
  font-family: var(--serif-tc);
  font-weight: 500;
  font-size: clamp(28px, 3.4vw, 44px);
  letter-spacing: 0.08em;
  color: var(--ink);
  line-height: 1.4;
  margin-top: 12px;
}
.section-sub {
  margin-top: 18px;
  color: var(--ink-soft);
  font-size: 16px;
  line-height: 1.85;
  max-width: 680px;
}

/* ============ Layout ============ */
.container {
  max-width: 1200px;
  margin: 0 auto;
  padding: 0 32px;
  position: relative;
  z-index: 2;
}
section { padding: 96px 0; position: relative; z-index: 2; }
.section-header { text-align: center; margin-bottom: 64px; }
.section-header .section-sub { margin-left: auto; margin-right: auto; }

.divider-gold {
  width: 56px; height: 1px;
  background: var(--gold);
  margin: 24px auto;
  position: relative;
}
.divider-gold::before,
.divider-gold::after {
  content: ''; position: absolute; top: 50%; width: 4px; height: 4px;
  background: var(--gold); border-radius: 50%; transform: translateY(-50%);
}
.divider-gold::before { left: -10px; }
.divider-gold::after  { right: -10px; }

/* ============ Buttons ============ */
.btn {
  display: inline-flex; align-items: center; gap: 10px;
  padding: 14px 28px;
  font-family: var(--serif-tc);
  font-weight: 500;
  font-size: 15px;
  letter-spacing: 0.12em;
  border: 1px solid transparent;
  transition: all .35s var(--ease);
  cursor: pointer;
}
.btn-primary {
  background: var(--ink);
  color: var(--paper);
  border-color: var(--ink);
}
.btn-primary:hover {
  background: var(--gold-deep);
  border-color: var(--gold-deep);
}
.btn-ghost {
  background: transparent;
  color: var(--ink);
  border-color: var(--ink-soft);
}
.btn-ghost:hover {
  background: var(--ink);
  color: var(--paper);
  border-color: var(--ink);
}
.btn-arrow { transition: transform .3s var(--ease); }
.btn:hover .btn-arrow { transform: translateX(4px); }

/* ============ Nav ============ */
.nav {
  position: fixed; top: 0; left: 0; right: 0; z-index: 100;
  padding: 20px 0;
  transition: all .3s var(--ease);
  backdrop-filter: blur(14px); -webkit-backdrop-filter: blur(14px);
  background: rgba(245, 241, 232, 0.78);
  border-bottom: 1px solid transparent;
}
.nav.scrolled { padding: 14px 0; border-bottom-color: var(--line); }
.nav .container { display: flex; align-items: center; justify-content: space-between; gap: 32px; }
.nav-logo { display: flex; align-items: center; gap: 14px; font-weight: 500; letter-spacing: 0.08em; transition: opacity .25s var(--ease); }
.nav-logo:hover { opacity: 0.78; }
.nav-logo .logo-mark {
  width: 38px; height: 38px;
  flex-shrink: 0;
}
.nav-logo .logo-word {
  display: flex; flex-direction: column;
  line-height: 1.1;
}
.nav-logo .logo-en {
  font-family: var(--serif-en);
  font-style: italic;
  font-weight: 500;
  font-size: 17px;
  letter-spacing: 0.18em;
  color: var(--ink);
}
.nav-logo .logo-en i { color: var(--cinnabar); font-style: normal; margin: 0 1px; }
.nav-logo .logo-tc {
  font-family: var(--serif-tc);
  font-weight: 400;
  font-size: 11px;
  letter-spacing: 0.18em;
  color: var(--ink-mute);
  margin-top: 3px;
}
@media (max-width: 600px) {
  .nav-logo .logo-tc { display: none; }
  .nav-logo .logo-en { font-size: 15px; letter-spacing: 0.14em; }
  .nav-logo .logo-mark { width: 32px; height: 32px; }
}
.nav-links { display: flex; gap: 28px; align-items: center; }
.nav-links a {
  font-size: 14px;
  letter-spacing: 0.1em;
  color: var(--ink-soft);
  position: relative;
  padding: 4px 0;
  transition: color .3s var(--ease);
}
.nav-links a::after {
  content: ''; position: absolute; bottom: 0; left: 50%; width: 0; height: 1px;
  background: var(--gold);
  transition: all .3s var(--ease);
  transform: translateX(-50%);
}
.nav-links a:hover { color: var(--ink); }
.nav-links a:hover::after { width: 100%; }
.nav-tools { display: flex; gap: 14px; align-items: center; }
.nav-cta {
  padding: 10px 20px;
  background: var(--ink);
  color: var(--paper);
  font-size: 13px;
  letter-spacing: 0.12em;
  transition: all .3s var(--ease);
}
.nav-cta:hover { background: var(--gold-deep); }

/* Language switcher */
.lang-switch {
  display: flex; gap: 0;
  border: 1px solid var(--line);
  background: var(--ivory);
}
.lang-switch button {
  padding: 6px 10px;
  font-family: var(--serif-en);
  font-size: 12px;
  letter-spacing: 0.1em;
  color: var(--ink-mute);
  border-right: 1px solid var(--line);
  transition: all .25s var(--ease);
  font-style: italic;
}
.lang-switch button:last-child { border-right: none; }
.lang-switch button.active {
  background: var(--ink);
  color: var(--paper);
}

/* Mobile nav */
.nav-burger { display: none; flex-direction: column; gap: 4px; padding: 8px; }
.nav-burger span { width: 22px; height: 1.5px; background: var(--ink); transition: .3s var(--ease); }

@media (max-width: 980px) {
  .nav-links { display: none; }
  .nav-burger { display: flex; }
  .nav-links.open {
    display: flex; flex-direction: column;
    position: absolute; top: 100%; left: 0; right: 0;
    background: var(--paper); padding: 24px 32px;
    border-top: 1px solid var(--line);
  }
}

/* ============ Reveal animation ============ */
.reveal { opacity: 0; transform: translateY(30px); transition: opacity .9s var(--ease), transform .9s var(--ease); }
.reveal.in { opacity: 1; transform: translateY(0); }

/* ============ Cards (shared) ============ */
.card {
  background: var(--ivory);
  border: 1px solid var(--line-soft);
  padding: 36px;
  position: relative;
  transition: all .4s var(--ease);
}
.card::before {
  content: ''; position: absolute; top: 0; left: 0; height: 1px; width: 0;
  background: var(--gold);
  transition: width .5s var(--ease);
}
.card:hover {
  transform: translateY(-4px);
  border-color: var(--gold-light);
  box-shadow: 0 20px 40px -20px rgba(43, 42, 38, 0.18);
}
.card:hover::before { width: 100%; }

/* ============ Footer ============ */
.footer {
  background: var(--ink-deep);
  color: var(--paper);
  padding: 80px 0 32px;
  position: relative;
  z-index: 2;
}
.footer .container {
  display: grid;
  grid-template-columns: 1.5fr 1fr 1fr 1fr;
  gap: 48px;
}
.footer h4 {
  font-family: var(--serif-en);
  font-style: italic;
  font-weight: 400;
  font-size: 14px;
  letter-spacing: 0.18em;
  color: var(--gold-light);
  text-transform: uppercase;
  margin-bottom: 20px;
}
.footer .brand-name {
  font-family: var(--serif-tc);
  font-size: 20px;
  font-weight: 500;
  letter-spacing: 0.12em;
  margin-bottom: 16px;
  color: var(--paper);
}
.footer p { color: var(--ink-faint); font-size: 14px; line-height: 1.85; }
.footer ul { list-style: none; }
.footer ul li { margin-bottom: 10px; }
.footer ul a { color: var(--ink-faint); font-size: 14px; transition: color .3s var(--ease); }
.footer ul a:hover { color: var(--gold-light); }
.footer-bottom {
  margin-top: 64px; padding-top: 24px;
  border-top: 1px solid rgba(255,255,255,0.08);
  display: flex; justify-content: space-between;
  font-size: 12px; color: var(--ink-faint);
  letter-spacing: 0.1em;
}
@media (max-width: 800px) {
  .footer .container { grid-template-columns: 1fr 1fr; }
  .footer-bottom { flex-direction: column; gap: 8px; text-align: center; }
}

/* ============ Utility ============ */
.vertical-text {
  writing-mode: vertical-rl;
  text-orientation: mixed;
  letter-spacing: 0.4em;
}
.seal-mark {
  display: inline-grid; place-items: center;
  background: var(--cinnabar);
  color: var(--paper);
  font-family: var(--serif-tc);
  font-weight: 600;
}
@media (prefers-reduced-motion: reduce) {
  *, *::before, *::after { animation: none !important; transition: none !important; }
}