/* ============ 主題變量 ============ */
:root, [data-theme="dark"] {
  --bg: #0f141b;
  --bg-alt: #151c25;
  --panel: #1a222d;
  --text-strong: #f3f1ea;
  --text: #e9e7e0;
  --text-soft: #a9aeb6;
  --text-faint: #767d87;
  --line: #26303c;
  --gold: #c9a24b;
  --gold-hi: #dcb75f;
  --gold-label: #c9a24b;
  --nav-bg: rgba(15,20,27,.9);
  --btn-bg: #c9a24b;
  --btn-text: #171308;
  --btn-hover: #dcb75f;
  --ghost: #c9a24b;
  --ghost-hover: #dcb75f;
  --band-bg: #f4ecd9;
  --band-text: #1c1a15;
  --band-em: #8a6410;
  --band-attr: #8a8272;
  --contact-bg: #f4ecd9;
  --contact-border: #e3d6b6;
  --contact-text: #1c1a15;
  --contact-sub: #5d5748;
  --contact-em: #8a6410;
  --watermark-opacity: .045;
}
[data-theme="light"] {
  --bg: #fbfaf7;
  --bg-alt: #ffffff;
  --panel: #ffffff;
  --text-strong: #17161a;
  --text: #1a1a1a;
  --text-soft: #5b5a63;
  --text-faint: #8b8a92;
  --line: #e9e5db;
  --gold: #a97e1c;
  --gold-hi: #8a6410;
  --gold-label: #8a6410;
  --nav-bg: rgba(251,250,247,.92);
  --btn-bg: #17161a;
  --btn-text: #ffffff;
  --btn-hover: #8a6410;
  --ghost: #17161a;
  --ghost-hover: #8a6410;
  --band-bg: #1d1c22;
  --band-text: #eceae4;
  --band-em: #c9a24b;
  --band-attr: #9a98a0;
  --contact-bg: #f6efdf;
  --contact-border: #eadfc4;
  --contact-text: #17161a;
  --contact-sub: #5b5a63;
  --contact-em: #8a6410;
  --watermark-opacity: .05;
}

* { margin: 0; padding: 0; box-sizing: border-box; }
html { scroll-behavior: smooth; }
body {
  font-family: "Songti TC", "Noto Serif TC", "PingFang TC", Georgia, serif;
  color: var(--text);
  background: var(--bg);
  line-height: 1.85;
  -webkit-font-smoothing: antialiased;
  transition: background-color .35s, color .35s;
}
html[lang="zh-Hans"] body { font-family: "Songti SC", "Noto Serif SC", "PingFang SC", Georgia, serif; }
html[lang="en"] body { font-family: Georgia, "Times New Roman", serif; }
.wrap { max-width: 1080px; margin: 0 auto; padding: 0 28px; }
.en { font-family: Georgia, "Times New Roman", serif; }

/* ---------- Nav ---------- */
nav {
  position: sticky; top: 0; z-index: 50;
  background: var(--nav-bg);
  backdrop-filter: blur(10px);
  border-bottom: 1px solid var(--line);
}
.nav-inner { display: flex; align-items: center; justify-content: space-between; height: 64px; }
.brand { display: flex; align-items: baseline; gap: 12px; text-decoration: none; color: var(--text); }
.brand-en { font-size: 17px; letter-spacing: 3px; font-weight: 700; }
.brand-cn { font-size: 14px; color: var(--gold); letter-spacing: 5px; }
.nav-right { display: flex; align-items: center; gap: 22px; }
.nav-links { display: flex; gap: 30px; }
.nav-links a { font-size: 13.5px; color: var(--text-soft); text-decoration: none; letter-spacing: 1px; }
.nav-links a:hover { color: var(--gold-hi); }
.lang { display: flex; align-items: center; gap: 8px; font-size: 13px; }
.lang a { color: var(--text-soft); text-decoration: none; }
.lang a:hover { color: var(--gold-hi); }
.lang a.active { color: var(--gold); font-weight: 700; }
.lang span { color: var(--line); }
.theme-toggle {
  width: 36px; height: 36px; border-radius: 50%;
  border: 1px solid var(--line); background: transparent;
  color: var(--gold); font-size: 16px; cursor: pointer;
  display: flex; align-items: center; justify-content: center;
  transition: border-color .25s, transform .25s;
}
.theme-toggle:hover { border-color: var(--gold); transform: rotate(20deg); }
@media (max-width: 780px) { .nav-links { display: none; } }

/* ---------- Hero ---------- */
.hero { padding: 110px 0 90px; position: relative; overflow: hidden; }
.hero::after {
  content: "承";
  position: absolute; right: -40px; top: 30px;
  font-size: 380px; line-height: 1;
  color: var(--gold); opacity: var(--watermark-opacity);
  pointer-events: none;
}
.kicker {
  display: inline-flex; align-items: center; gap: 10px;
  font-size: 12.5px; letter-spacing: 4px; color: var(--gold-label);
  margin-bottom: 26px;
}
.kicker::before { content: ""; width: 36px; height: 1px; background: var(--gold); }
.hero h1 { font-size: 46px; line-height: 1.4; font-weight: 700; max-width: 760px; margin-bottom: 30px; color: var(--text-strong); }
.hero h1 em { font-style: normal; color: var(--gold-hi); }
.hero .sub { font-size: 17.5px; color: var(--text-soft); max-width: 660px; }
.hero .sub-en { margin-top: 14px; font-size: 14px; color: var(--text-faint); max-width: 660px; }
.hero-actions { margin-top: 44px; display: flex; gap: 18px; flex-wrap: wrap; }
.btn { display: inline-block; padding: 14px 38px; font-size: 14.5px; letter-spacing: 2px; text-decoration: none; transition: all .25s; }
.btn-primary { background: var(--btn-bg); color: var(--btn-text); font-weight: 600; }
.btn-primary:hover { background: var(--btn-hover); color: var(--btn-text); }
[data-theme="light"] .btn-primary:hover { color: #fff; }
.btn-ghost { border: 1px solid var(--ghost); color: var(--ghost); }
.btn-ghost:hover { color: var(--ghost-hover); border-color: var(--ghost-hover); }
@media (max-width: 720px) { .hero h1 { font-size: 31px; } .hero { padding: 70px 0 60px; } }

/* ---------- Section scaffolding ---------- */
.section { padding: 92px 0; }
.section.alt { background: var(--bg-alt); border-top: 1px solid var(--line); border-bottom: 1px solid var(--line); }
.section-head { margin-bottom: 54px; }
.section-tag { font-size: 12px; letter-spacing: 5px; color: var(--gold-label); margin-bottom: 12px; }
.section h2 { font-size: 32px; font-weight: 700; color: var(--text-strong); }
.section .h2-en { font-size: 14px; color: var(--text-faint); margin-top: 6px; }
.section .lede { margin-top: 18px; font-size: 16px; color: var(--text-soft); max-width: 680px; }

/* ---------- Corridors ---------- */
.corridors { display: grid; grid-template-columns: 1fr auto 1fr; gap: 0; align-items: stretch; }
.corridor { background: var(--panel); border: 1px solid var(--line); padding: 44px 40px; }
.corridor .dir { font-size: 12px; letter-spacing: 4px; color: var(--gold-label); margin-bottom: 16px; }
.corridor h3 { font-size: 22px; margin-bottom: 6px; color: var(--text-strong); }
.corridor .h3-en { font-size: 13px; color: var(--text-faint); margin-bottom: 18px; }
.corridor p { font-size: 15px; color: var(--text-soft); margin-bottom: 18px; }
.corridor ul { list-style: none; }
.corridor li { font-size: 14px; color: var(--text-soft); padding: 9px 0 9px 22px; border-top: 1px dashed var(--line); position: relative; }
.corridor li::before { content: "·"; color: var(--gold); font-weight: 700; font-size: 22px; position: absolute; left: 2px; top: 4px; }
.corridor-mid { display: flex; flex-direction: column; align-items: center; justify-content: center; padding: 0 34px; gap: 10px; }
.corridor-mid .arrows { font-size: 26px; color: var(--gold); letter-spacing: 0; }
.corridor-mid .mid-label { writing-mode: vertical-rl; font-size: 13px; letter-spacing: 6px; color: var(--text-faint); }
html[lang="en"] .corridor-mid .mid-label { writing-mode: horizontal-tb; letter-spacing: 3px; }
@media (max-width: 960px) {
  .corridors { grid-template-columns: 1fr; }
  .corridor-mid { flex-direction: row; padding: 22px 0; gap: 16px; }
  .corridor-mid .arrows { transform: rotate(90deg); }
  .corridor-mid .mid-label { writing-mode: horizontal-tb; letter-spacing: 4px; }
}

/* ---------- Services ---------- */
.grid2 { display: grid; grid-template-columns: 1fr 1fr; gap: 30px; }
@media (max-width: 820px) { .grid2 { grid-template-columns: 1fr; } }
.card {
  border: 1px solid var(--line); background: var(--bg-alt); padding: 40px 36px;
  display: flex; flex-direction: column; transition: border-color .25s, transform .25s, background-color .35s;
}
[data-theme="light"] .card { background: var(--bg); }
.card:hover { border-color: var(--gold); transform: translateY(-3px); }
.card .num { font-size: 13px; color: var(--gold-label); letter-spacing: 3px; }
.card h3 { font-size: 21px; margin: 12px 0 4px; color: var(--text-strong); }
.card .h3-en { font-size: 12.5px; color: var(--text-faint); margin-bottom: 16px; }
.card > p { font-size: 14.5px; color: var(--text-soft); margin-bottom: 20px; }
.card ul { list-style: none; margin-top: auto; }
.card li { font-size: 13.5px; color: var(--text-soft); padding: 8px 0 8px 20px; border-top: 1px dashed var(--line); position: relative; }
.card li::before { content: "·"; color: var(--gold); font-weight: 700; font-size: 20px; position: absolute; left: 2px; top: 3px; }

/* ---------- Philosophy band ---------- */
.band { background: var(--band-bg); color: var(--band-text); padding: 88px 0; transition: background-color .35s, color .35s; }
.band .wrap { max-width: 880px; text-align: center; }
.band .quote-mark {
  font-size: 76px; color: var(--band-em); opacity: .55;
  line-height: .6; margin-bottom: 26px; user-select: none;
}
.band blockquote { font-size: 26px; line-height: 1.8; font-weight: 600; }
.band blockquote em { font-style: normal; color: var(--band-em); }
.band .attr { margin-top: 26px; font-size: 13px; letter-spacing: 3px; color: var(--band-attr); }
@media (max-width: 720px) { .band blockquote { font-size: 20px; } }

/* ---------- Process ---------- */
.steps { display: grid; grid-template-columns: repeat(4, 1fr); gap: 26px; counter-reset: step; }
@media (max-width: 820px) { .steps { grid-template-columns: 1fr 1fr; } }
@media (max-width: 520px) { .steps { grid-template-columns: 1fr; } }
.step { position: relative; padding-top: 18px; }
.step::before {
  counter-increment: step; content: "0" counter(step);
  font-family: Georgia, serif; font-size: 44px; color: var(--gold); opacity: .3;
  position: absolute; top: -14px; left: 0; line-height: 1;
}
.step h4 { font-size: 17.5px; margin-bottom: 8px; position: relative; color: var(--text-strong); }
.step .h4-en { font-size: 11.5px; color: var(--text-faint); letter-spacing: 1px; margin-bottom: 10px; }
.step p { font-size: 13.5px; color: var(--text-soft); }

/* ---------- Sectors ---------- */
.sectors { display: flex; flex-wrap: wrap; gap: 14px; }
.sector { border: 1px solid var(--line); background: var(--panel); padding: 12px 24px; font-size: 14px; color: var(--text-soft); }
.sector strong { color: var(--gold-hi); font-weight: 600; }
[data-theme="light"] .sector strong { color: var(--text-strong); }

/* ---------- Why ---------- */
.why { display: grid; grid-template-columns: 1fr 1fr 1fr; gap: 40px; }
@media (max-width: 820px) { .why { grid-template-columns: 1fr; } }
.why-item { border-top: 2px solid var(--gold); padding-top: 22px; }
.why-item strong { display: block; font-size: 18px; margin-bottom: 10px; color: var(--text-strong); }
.why-item span { font-size: 14.5px; color: var(--text-soft); }

/* ---------- Contact ---------- */
.contact-box {
  background: var(--contact-bg); border: 1px solid var(--contact-border);
  padding: 70px 48px; text-align: center; color: var(--contact-text);
  transition: background-color .35s;
}
.contact-box .section-tag { margin-bottom: 14px; color: var(--contact-em); }
.contact-box h2 { font-size: 30px; margin-bottom: 12px; color: var(--contact-text); }
.contact-box p { color: var(--contact-sub); font-size: 15.5px; max-width: 560px; margin: 0 auto 30px; }
.contact-box a.mail { font-size: 20px; color: var(--contact-text); text-decoration: none; border-bottom: 2px solid var(--contact-em); padding-bottom: 3px; }
.contact-box a.mail:hover { color: var(--contact-em); }
.contact-note { margin-top: 26px; font-size: 12.5px; color: var(--band-attr); }

/* ---------- Footer ---------- */
footer { padding: 48px 0 64px; font-size: 13px; color: var(--text-faint); border-top: 1px solid var(--line); }
footer .foot-grid { display: flex; justify-content: space-between; gap: 30px; flex-wrap: wrap; }
footer .co { font-weight: 700; color: var(--text); margin-bottom: 8px; font-size: 14px; }