/* ============================================================
   叩寂珠宝 · 品牌视觉识别手册 VI
   ============================================================ */
:root {
  --bg: #0A0E19;
  --bg-2: #0D1424;
  --bg-3: #111A2E;
  --bg-card: #0F1626;
  --paper: #F1EDE3;
  --line: rgba(201, 167, 106, 0.18);
  --line-soft: rgba(241, 237, 227, 0.09);
  --ink: #F1EDE3;
  --ink-2: #A7AFC2;
  --ink-3: #6E7690;
  --gold: #C9A76A;
  --gold-2: #E4C98F;
  --gold-3: #8A6A35;
  --serif: "Noto Serif SC", "Source Han Serif SC", "Songti SC", "STSong", "SimSun", serif;
  --latin: "Cormorant Garamond", "Georgia", "Times New Roman", serif;
  --maxw: 1180px;
  --ease: cubic-bezier(.22, .61, .36, 1);
}
* { margin: 0; padding: 0; box-sizing: border-box; }
html { scroll-behavior: smooth; }
body { background: var(--bg); color: var(--ink); font-family: var(--serif); line-height: 1.9; letter-spacing: .02em; -webkit-font-smoothing: antialiased; overflow-x: hidden; }
::selection { background: rgba(201,167,106,.28); color: #fff; }
a { color: inherit; text-decoration: none; }
img, svg { display: block; }
.container { max-width: var(--maxw); margin: 0 auto; padding: 0 44px; }

/* ---------- 顶部导航 ---------- */
.vi-nav { position: fixed; top: 0; left: 0; right: 0; z-index: 100; border-bottom: 1px solid transparent; transition: background .4s var(--ease), border-color .4s; }
.vi-nav.scrolled { background: rgba(10,14,25,.85); backdrop-filter: blur(14px); border-bottom-color: var(--line-soft); }
.vi-nav-inner { max-width: var(--maxw); margin: 0 auto; padding: 20px 44px; display: flex; align-items: center; justify-content: space-between; gap: 20px; }
.vi-nav-brand { display: flex; align-items: center; gap: 12px; font-size: 15px; letter-spacing: .3em; }
.vi-nav-brand small { font-family: var(--latin); font-size: 10px; letter-spacing: .28em; color: var(--gold); text-transform: uppercase; }
.vi-nav-links { display: flex; gap: 26px; flex-wrap: wrap; }
.vi-nav-links a { font-size: 12.5px; letter-spacing: .18em; color: var(--ink-2); transition: color .3s; }
.vi-nav-links a:hover { color: var(--gold-2); }

/* ---------- 封面 ---------- */
.vi-cover { min-height: 100vh; display: flex; flex-direction: column; align-items: center; justify-content: center; text-align: center; position: relative; overflow: hidden;
  background: radial-gradient(ellipse 80% 60% at 50% -10%, rgba(35,54,96,.5), transparent 60%), radial-gradient(ellipse 60% 50% at 85% 100%, rgba(22,34,64,.45), transparent 65%), linear-gradient(180deg, #070A13, #0A0E19 45%, #0C1220); }
.vi-cover::before { content: ""; position: absolute; inset: 0; background-image: radial-gradient(rgba(255,255,255,.16) 1px, transparent 1.4px); background-size: 34px 34px; background-position: 0 0; opacity: .5; }
.vi-cover > * { position: relative; z-index: 2; }
.cover-ring { position: absolute; left: 50%; top: 46%; transform: translate(-50%, -50%); width: min(88vw, 900px); height: auto; z-index: 1; pointer-events: none; }
.vi-cover .logo-lockup { margin-bottom: 54px; }
.vi-cover-title { font-size: clamp(30px, 4.4vw, 52px); font-weight: 700; letter-spacing: .42em; }
.vi-cover-sub { font-family: var(--latin); font-size: 14px; letter-spacing: .5em; color: var(--gold); margin-top: 16px; text-transform: uppercase; }
.vi-cover-meta { margin-top: 44px; display: flex; gap: 40px; justify-content: center; }
.vi-cover-meta span { font-size: 12px; letter-spacing: .24em; color: var(--ink-3); }
.vi-cover-meta b { display: block; font-weight: 500; color: var(--ink-2); letter-spacing: .1em; margin-top: 4px; }

/* ---------- 章节通用 ---------- */
.vi-section { padding: 110px 0; border-top: 1px solid var(--line-soft); }
.vi-section-head { margin-bottom: 58px; }
.vi-section-head .idx { font-family: var(--latin); font-size: 14px; letter-spacing: .4em; color: var(--gold); }
.vi-section-head h2 { font-size: clamp(26px, 3.4vw, 38px); font-weight: 600; letter-spacing: .3em; margin: 10px 0 6px; }
.vi-section-head .en { font-family: var(--latin); font-size: 12px; letter-spacing: .42em; color: var(--ink-3); text-transform: uppercase; }
.vi-section-head .desc { margin-top: 18px; max-width: 640px; color: var(--ink-2); font-size: 14px; letter-spacing: .06em; }

/* 展示面板 */
.board { border: 1px solid var(--line-soft); background: linear-gradient(170deg, var(--bg-3), var(--bg-card)); padding: 46px; }
.board-title { font-size: 13px; letter-spacing: .28em; color: var(--gold); margin-bottom: 26px; }
.board-title::before { content: ""; display: inline-block; width: 22px; height: 1px; background: var(--gold); vertical-align: middle; margin-right: 14px; }

/* ---------- 标志规范 ---------- */
.logo-block { display: grid; grid-template-columns: 1.2fr 1fr; gap: 30px; align-items: stretch; }
.logo-panel { border: 1px solid var(--line-soft); background: var(--bg-3); min-height: 300px; display: flex; align-items: center; justify-content: center; padding: 40px; }
.logo-panel.light { background: var(--paper); }
.logo-panel-title { text-align: center; font-size: 12px; letter-spacing: .26em; color: var(--ink-3); margin-top: 18px; }
.logo-panel.light .logo-panel-title { color: #8a8578; }

/* Logo 组合 */
.logo-lockup { display: inline-flex; align-items: center; gap: 22px; }
.logo-lockup.vertical { flex-direction: column; gap: 14px; }
.logo-mark { width: 74px; height: 74px; flex: none; }
.logo-lockup.vertical .logo-mark { width: 92px; height: 92px; }
.logo-word { display: flex; flex-direction: column; }
.logo-cn { font-size: 34px; font-weight: 700; letter-spacing: .34em; line-height: 1.3; }
.logo-en { font-family: var(--latin); font-size: 11px; letter-spacing: .32em; color: var(--gold); text-transform: uppercase; margin-top: 4px; }
.logo-panel.light .logo-cn { color: #141A26; }
.logo-panel.light .logo-en { color: var(--gold-3); }

/* 安全区 */
.safety { display: grid; grid-template-columns: repeat(3, 1fr); gap: 30px; margin-top: 30px; }
.safety-item { border: 1px dashed rgba(201,167,106,.4); padding: 26px 20px 18px; text-align: center; position: relative; background: rgba(201,167,106,.03); }
.safety-item .logo-lockup { transform: scale(.82); }
.safety-note { font-size: 11px; color: var(--ink-3); letter-spacing: .14em; margin-top: 12px; }
.safety-note b { color: var(--gold-2); font-weight: 500; }

/* ---------- 色彩 ---------- */
.swatches { display: grid; grid-template-columns: repeat(3, 1fr); gap: 26px; }
.swatch { border: 1px solid var(--line-soft); background: var(--bg-card); overflow: hidden; }
.swatch-color { height: 150px; position: relative; }
.swatch-name { padding: 18px 20px; }
.swatch-name h4 { font-size: 14px; letter-spacing: .2em; font-weight: 600; }
.swatch-name p { font-size: 11px; color: var(--ink-3); letter-spacing: .12em; margin-top: 2px; }
.swatch-name .use { margin-top: 8px; font-size: 11.5px; color: var(--ink-2); line-height: 1.8; }
.color-values { margin-top: 30px; border: 1px solid var(--line-soft); overflow-x: auto; }
.color-values table { width: 100%; border-collapse: collapse; font-size: 12.5px; }
.color-values th, .color-values td { padding: 13px 18px; text-align: left; border-bottom: 1px solid var(--line-soft); white-space: nowrap; }
.color-values th { font-size: 11px; letter-spacing: .2em; color: var(--gold); font-weight: 500; }
.color-values td { color: var(--ink-2); font-family: var(--latin), var(--serif); letter-spacing: .06em; }
.color-values tr:last-child td { border-bottom: 0; }

/* ---------- 字体 ---------- */
.type-grid { display: grid; grid-template-columns: 1fr 1fr; gap: 30px; }
.type-card { border: 1px solid var(--line-soft); background: var(--bg-card); padding: 38px 36px; }
.type-card .tag { font-size: 11px; letter-spacing: .28em; color: var(--gold); }
.type-card h3 { font-size: 22px; font-weight: 600; letter-spacing: .12em; margin: 8px 0 4px; }
.type-card .note { font-size: 12px; color: var(--ink-3); letter-spacing: .08em; margin-bottom: 24px; }
.type-samples { display: flex; flex-direction: column; gap: 10px; }
.type-samples .s1 { font-size: 30px; }
.type-samples .s2 { font-size: 20px; }
.type-samples .s3 { font-size: 15px; color: var(--ink-2); }
.type-samples .s4 { font-size: 12px; color: var(--ink-3); letter-spacing: .1em; }
.type-latin { font-family: var(--latin); }
.type-cn { font-family: var(--serif); }

/* ---------- 辅助图形 ---------- */
.pattern-grid { display: grid; grid-template-columns: repeat(3, 1fr); gap: 30px; }
.pattern-item { border: 1px solid var(--line-soft); background: var(--bg-card); padding: 34px; text-align: center; }
.pattern-item svg { margin: 0 auto 20px; }
.pattern-item h4 { font-size: 14px; letter-spacing: .22em; font-weight: 600; }
.pattern-item p { font-size: 12px; color: var(--ink-3); margin-top: 8px; line-height: 1.9; }

/* ---------- 应用示例 ---------- */
.apply-grid { display: grid; grid-template-columns: repeat(2, 1fr); gap: 34px; }
.apply-item { border: 1px solid var(--line-soft); background: var(--bg-card); padding: 40px; }
.apply-item h4 { font-size: 14px; letter-spacing: .24em; font-weight: 600; margin-bottom: 6px; }
.apply-item .cap { font-size: 12px; color: var(--ink-3); margin-bottom: 28px; }

/* 名片 */
.bc { border-radius: 4px; box-shadow: 0 18px 40px rgba(0,0,0,.35); overflow: hidden; }
.bc-h { display: flex; align-items: center; justify-content: space-between; padding: 34px 36px; background: linear-gradient(150deg, #0E1424, #0A0E19); min-height: 190px; position: relative; }
.bc-h::before { content: ""; position: absolute; inset: 0; background-image: radial-gradient(rgba(255,255,255,.14) 1px, transparent 1.3px); background-size: 26px 26px; opacity: .5; }
.bc-h > * { position: relative; z-index: 2; }
.bc-h .logo-mark { width: 54px; height: 54px; }
.bc-h .bc-name { text-align: right; }
.bc-h .bc-name b { display: block; font-size: 19px; font-weight: 600; letter-spacing: .2em; }
.bc-h .bc-name i { display: block; font-style: normal; font-size: 11px; color: var(--gold); letter-spacing: .3em; margin: 6px 0 14px; }
.bc-h .bc-name span { display: block; font-size: 11px; color: var(--ink-3); letter-spacing: .1em; }
.bc-v { background: var(--paper); color: #141A26; padding: 34px 32px; display: flex; flex-direction: column; align-items: center; text-align: center; min-height: 250px; justify-content: space-between; }
.bc-v .logo-lockup { flex-direction: column; gap: 10px; }
.bc-v .logo-mark { width: 64px; height: 64px; }
.bc-v .logo-cn { font-size: 26px; color: #141A26; }
.bc-v .logo-en { color: var(--gold-3); }
.bc-v .bc-line { width: 46px; height: 1px; background: rgba(138,106,53,.5); margin: 16px 0; }
.bc-v p { font-size: 11px; color: #6E6a5c; letter-spacing: .14em; line-height: 2; }

/* 吊牌 */
.hangtag { width: 168px; margin: 0 auto; position: relative; }
.hangtag .rope { width: 2px; height: 44px; background: linear-gradient(180deg, transparent, var(--gold)); margin: 0 auto; }
.hangtag .tag { background: linear-gradient(160deg, #0E1424, #0A0E19); border: 1px solid rgba(201,167,106,.35); border-radius: 3px; padding: 26px 18px; text-align: center; }
.hangtag .logo-mark { width: 60px; height: 60px; margin: 0 auto 14px; }
.hangtag .tag b { display: block; font-size: 14px; letter-spacing: .24em; }
.hangtag .tag span { display: block; font-family: var(--latin); font-size: 9px; letter-spacing: .22em; color: var(--gold); margin-top: 4px; }

/* 信笺 */
.letter { background: var(--paper); color: #33302A; padding: 40px 42px 34px; min-height: 300px; position: relative; }
.letter-head { display: flex; justify-content: space-between; align-items: flex-start; border-bottom: 1px solid rgba(138,106,53,.35); padding-bottom: 20px; }
.letter-head .logo-mark { width: 42px; height: 42px; }
.letter-head .lh-text { text-align: right; }
.letter-head .lh-text b { display: block; font-size: 15px; letter-spacing: .18em; color: #141A26; }
.letter-head .lh-text span { display: block; font-family: var(--latin); font-size: 10px; letter-spacing: .2em; color: var(--gold-3); }
.letter-body { margin-top: 26px; display: flex; flex-direction: column; gap: 16px; }
.letter-body i { height: 9px; background: rgba(51,48,42,.16); display: block; }
.letter-body i.w70 { width: 70%; } .letter-body i.w85 { width: 85%; } .letter-body i.w55 { width: 55%; } .letter-body i.w60 { width: 60%; }
.letter-foot { margin-top: 30px; display: flex; justify-content: flex-end; gap: 28px; }
.letter-foot span { display: block; width: 74px; height: 9px; background: rgba(51,48,42,.22); }

/* 印章 */
.seal-wrap { display: flex; justify-content: center; }
.seal { width: 190px; height: 190px; border-radius: 50%; border: 2px solid var(--gold); position: relative; display: flex; align-items: center; justify-content: center; background: rgba(201,167,106,.05); }
.seal svg { position: absolute; inset: 0; width: 100%; height: 100%; }
.seal .seal-cn { font-size: 40px; font-weight: 700; letter-spacing: .06em; color: var(--gold-2); }
.seal .seal-sm { position: absolute; bottom: 42px; font-size: 8px; letter-spacing: .3em; color: var(--gold); }

/* ---------- 禁用规范 ---------- */
.bad-grid { display: grid; grid-template-columns: repeat(3, 1fr); gap: 26px; }
.bad-item { border: 1px solid var(--line-soft); background: var(--bg-card); padding: 26px 22px; text-align: center; position: relative; }
.bad-item::before { content: "×"; position: absolute; top: 10px; right: 16px; font-size: 30px; color: rgba(190, 80, 70, .8); line-height: 1; font-family: var(--latin); }
.bad-item .bad-visual { height: 130px; display: flex; align-items: center; justify-content: center; margin-bottom: 16px; }
.bad-item h5 { font-size: 12.5px; letter-spacing: .18em; font-weight: 600; color: var(--ink-2); }
.bad-item p { font-size: 11px; color: var(--ink-3); margin-top: 6px; }
.bad-visual .logo-mark { width: 76px; height: 76px; }
.bad-visual .stretch { transform: scaleX(1.55) scaleY(.75); }
.bad-visual .squash { transform: scaleX(.7) scaleY(1.5); }
.bad-visual .rotate { transform: rotate(14deg); }
.bad-visual .hue { filter: hue-rotate(160deg) saturate(1.4); }
.bad-visual .glow { filter: drop-shadow(0 0 10px rgba(120, 200, 255, .9)); }
.bad-visual .type-wrong { font-size: 34px; font-weight: 900; font-family: "Microsoft YaHei", sans-serif; letter-spacing: .34em; color: var(--ink); }

/* ---------- 页脚 ---------- */
.vi-footer { border-top: 1px solid var(--line-soft); padding: 50px 0 60px; text-align: center; }
.vi-footer .logo-lockup { margin: 0 auto 20px; justify-content: center; }
.vi-footer p { font-size: 12px; color: var(--ink-3); letter-spacing: .12em; }

/* ---------- 响应式 ---------- */
@media (max-width: 980px) {
  .logo-block, .type-grid, .apply-grid { grid-template-columns: 1fr; }
  .safety, .swatches, .pattern-grid, .bad-grid { grid-template-columns: repeat(2, 1fr); }
  .vi-nav-links { display: none; }
}
@media (max-width: 640px) {
  .container { padding: 0 22px; }
  .vi-section { padding: 80px 0; }
  .swatches, .pattern-grid, .bad-grid { grid-template-columns: 1fr; }
  .board { padding: 28px 20px; }
  .logo-lockup { gap: 14px; }
  .logo-cn { font-size: 26px; }
  .vi-cover-meta { flex-direction: column; gap: 14px; }
}

/* ---------- 打印 / PDF ---------- */
@media print {
  .vi-nav { display: none !important; }
  body { background: #0A0E19; }
  .vi-cover { min-height: 100vh; height: 100vh; break-after: page; }
  .vi-section { padding: 56px 0 40px; break-inside: auto; }
  .vi-section-head { margin-bottom: 36px; }
  .logo-block, .type-grid, .apply-grid, .pattern-grid, .bad-grid, .swatches, .safety, .color-values, .seal-wrap { break-inside: avoid; }
  .board, .logo-panel, .swatch, .pattern-item, .apply-item, .bad-item, .service-item { break-inside: avoid; }
  .vi-footer { break-before: auto; }
  a { text-decoration: none; }
}