/* ============================================================
   金诚同达 · 刘峻佐律师执业网站 · 共享设计系统
   本文件是全站锁死的设计法（色板 / 字体 / 圆角 / 动效 / 组件）。
   index.html 与 firm.html 共用。改动前先读《设计宪章 Design Charter.md》。
   ============================================================ */

/* ============ 基础 ============ */
:root{
  --black:#000000;
  --ink:#0a0a0c;
  --graphite:#1d1d1f;
  --panel:#161617;
  --cloud:#f5f5f7;
  --white:#ffffff;
  --text-light:#f5f5f7;
  --text-dark:#1d1d1f;
  --gray:#86868b;
  --gray-dark:#6e6e73;
  --red:#bc1a29;
  --radius:24px;
  --ease:cubic-bezier(0.25,0.1,0.25,1);
}
*{margin:0;padding:0;box-sizing:border-box;}
html{scroll-behavior:smooth;-webkit-font-smoothing:antialiased;}
body{
  font-family:-apple-system,"SF Pro Display","SF Pro Text","PingFang SC","Noto Sans SC","Microsoft YaHei",sans-serif;
  background:var(--black);
  color:var(--text-light);
  line-height:1.6;
  overflow-x:hidden;
}
img{max-width:100%;display:block;}
a{color:inherit;text-decoration:none;}
::selection{background:var(--red);color:#fff;}

/* ============ 导航 ============ */
.nav{
  position:fixed;top:0;left:0;right:0;z-index:100;
  backdrop-filter:saturate(180%) blur(20px);
  -webkit-backdrop-filter:saturate(180%) blur(20px);
  background:rgba(10,10,12,0.72);
  transition:background 0.4s var(--ease);
}
.nav-inner{
  max-width:1200px;margin:0 auto;
  display:flex;align-items:center;justify-content:space-between;
  padding:0 24px;height:68px;
}
.nav-brand{display:flex;align-items:center;transition:opacity 0.3s;}
.nav-brand:hover{opacity:0.82;}
.nav-logo{height:40px;width:auto;display:block;}
.nav-sep{width:1px;height:26px;background:rgba(255,255,255,0.26);margin:0 18px;flex:none;}
.nav-name{font-size:19px;font-weight:600;letter-spacing:0.02em;color:#fff;}
.nav-links{display:flex;align-items:center;gap:32px;font-size:13px;color:rgba(245,245,247,0.82);}
.nav-links a{transition:color 0.3s;}
.nav-links a:hover{color:#fff;}
/* 跨页入口：带红点标记，读作“离开本页去另一部” */
.nav-cta{display:inline-flex;align-items:center;gap:7px;color:#fff !important;font-weight:500;}
.nav-cta::before{content:"";width:5px;height:5px;border-radius:999px;background:var(--red);flex:none;}
@media (max-width:735px){
  .nav-inner{height:56px;}
  .nav-links{gap:14px;font-size:11.5px;}
  .nav-links a{white-space:nowrap;}
  /* 移动端只保留标了 nav-keep 的关键锚点，其余隐藏（按类而非位置，跨页稳） */
  .nav-links a:not(.nav-keep){display:none;}
  .nav-cta{gap:6px;}
  .nav-logo{height:28px;}
  .nav-sep,.nav-name{display:none;}
}

/* ============ Hero ============ */
.hero{
  position:relative;height:100vh;min-height:640px;
  display:flex;align-items:center;justify-content:center;
  overflow:hidden;
}
.hero-bg{position:absolute;inset:0;}
.hero-bg img{width:100%;height:100%;object-fit:cover;object-position:center bottom;}
.hero-bg::after{content:"";position:absolute;inset:0;background:linear-gradient(180deg,rgba(0,0,0,0.25) 0%,rgba(0,0,0,0) 35%,rgba(0,0,0,0) 70%,rgba(0,0,0,0.55) 100%);}
.hero-content{
  position:relative;z-index:2;text-align:center;
  padding-top:0;
}
.hero-firm{
  font-size:14px;font-weight:500;letter-spacing:0.24em;
  color:rgba(245,245,247,0.6);margin-bottom:30px;
  padding-left:0.24em;
}
.hero-name{
  font-size:clamp(66px,9.2vw,116px);
  font-weight:600;letter-spacing:0.12em;line-height:1;
  padding-left:0.12em;
  color:#fff;
}
.hero-rule{
  display:block;width:46px;height:1px;margin:34px auto 0;
  background:rgba(245,245,247,0.3);
}
.hero-role{
  margin:28px auto 0;font-size:clamp(18px,1.9vw,24px);font-weight:400;
  color:rgba(245,245,247,0.88);letter-spacing:0.06em;line-height:1.55;
  max-width:820px;padding:0 20px;
  display:flex;flex-wrap:wrap;justify-content:center;align-items:baseline;
}
.hero-role .rp{white-space:nowrap;}
.hero-role .rsep{font-style:normal;margin:0 0.72em;color:rgba(245,245,247,0.42);}
@media (max-width:700px){
  .hero-role{flex-direction:column;gap:9px;letter-spacing:0.09em;}
  .hero-role .rsep{display:none;}
}
.hero-scroll{
  position:absolute;bottom:36px;left:50%;transform:translateX(-50%);z-index:2;
  color:rgba(245,245,247,0.6);font-size:12px;letter-spacing:0.2em;
  display:flex;flex-direction:column;align-items:center;gap:10px;
}
.hero-scroll svg{animation:drift 2.4s var(--ease) infinite;}
@keyframes drift{0%,100%{transform:translateY(0);opacity:0.6;}50%{transform:translateY(6px);opacity:1;}}

/* ============ 章节通用 ============ */
.section{padding:140px 24px;}
.section-tight{padding:110px 24px;}
.wrap{max-width:980px;margin:0 auto;}
.wrap-wide{max-width:1200px;margin:0 auto;}
.eyebrow{
  color:var(--red);font-size:17px;font-weight:600;
  margin-bottom:14px;letter-spacing:0.02em;
}
.light .eyebrow{color:var(--red);}
h2.headline{
  font-size:clamp(40px,5.6vw,76px);
  font-weight:600;letter-spacing:-0.02em;line-height:1.08;
  text-wrap:balance;
}
.case-title,.work-title{text-wrap:balance;}
.lede{
  margin-top:26px;font-size:clamp(18px,2vw,22px);
  color:var(--gray);font-weight:400;line-height:1.65;
}
.light{background:var(--cloud);color:var(--text-dark);}
.light .lede{color:var(--gray-dark);}
.center{text-align:center;}

/* ============ 定位陈述 ============ */
.statement{background:var(--black);}
.statement-big{
  font-size:clamp(30px,4.2vw,54px);
  font-weight:600;letter-spacing:-0.015em;line-height:1.25;
}
.statement-big em{font-style:normal;color:var(--gray);}
.statement-body{
  margin-top:44px;font-size:clamp(17px,1.8vw,20px);
  color:var(--gray);max-width:780px;line-height:1.75;
}
.statement-body strong{color:var(--text-light);font-weight:500;}
.light .statement-body{color:var(--gray-dark);}
.light .statement-body strong{color:var(--text-dark);}
.light .statement-big em{color:var(--gray-dark);}

/* ============ 数字带 ============ */
.stats{background:var(--black);padding:60px 24px 120px;}
.stats-grid{
  max-width:1200px;margin:0 auto;
  display:grid;grid-template-columns:repeat(4,1fr);gap:24px;
}
.stat{text-align:center;padding:36px 12px;}
.stat-num{
  font-size:clamp(44px,5vw,72px);font-weight:600;letter-spacing:-0.03em;
  line-height:1;color:#fff;font-variant-numeric:tabular-nums;white-space:nowrap;
}
.stat-num sub{font-size:0.36em;font-weight:500;color:var(--gray);vertical-align:baseline;margin-left:2px;}
.stat-num .pre{font-size:0.36em;font-weight:500;color:var(--gray);margin-right:4px;}
.stat-label{margin-top:14px;font-size:15px;color:var(--gray);}
@media (max-width:1068px){.stats-grid{grid-template-columns:repeat(2,1fr);}}
@media (max-width:735px){.stats-grid{gap:8px;}.stat{padding:24px 6px;}}

/* ============ 领域章节 ============ */
.chapter-head{padding:150px 24px 70px;text-align:center;background:var(--black);}
.chapter-head .lede{max-width:760px;margin-left:auto;margin-right:auto;}
.chapter-visual{
  position:relative;height:82vh;min-height:420px;max-height:900px;overflow:hidden;
  background:var(--ink);
}
.chapter-visual img{
  width:100%;height:110%;object-fit:cover;
  will-change:transform;
}
.chapter-cases{background:var(--black);padding:90px 24px 60px;}
.cases-grid{
  max-width:1200px;margin:0 auto;
  display:grid;grid-template-columns:repeat(3,1fr);gap:24px;
}
@media (max-width:1068px){.cases-grid{grid-template-columns:1fr;max-width:640px;}}
.case-card{
  background:var(--graphite);border-radius:var(--radius);
  padding:36px 32px;display:flex;flex-direction:column;
  transition:transform 0.3s var(--ease),box-shadow 0.3s var(--ease);
}
.case-card:hover{transform:translateY(-4px);box-shadow:0 24px 48px rgba(0,0,0,0.5);}
.case-meta{font-size:14px;font-weight:600;color:var(--red);letter-spacing:0.04em;margin-bottom:16px;}
.case-title{font-size:23px;font-weight:600;line-height:1.34;letter-spacing:-0.01em;}
.case-result{
  margin-top:18px;font-size:16.5px;font-weight:500;color:var(--text-light);
  line-height:1.6;
}
.case-desc{margin-top:13px;font-size:15.5px;color:#a1a1a6;line-height:1.7;flex:1;}
.case-foot{margin-top:20px;padding-top:16px;border-top:1px solid rgba(255,255,255,0.08);font-size:14px;color:var(--gray);}

/* ============ 业绩精选（浅色） ============ */
.works{background:var(--cloud);color:var(--text-dark);padding:140px 24px;}
.works-head{text-align:center;max-width:820px;margin:0 auto 56px;}
.filter{
  display:flex;justify-content:center;flex-wrap:wrap;gap:10px;margin-bottom:52px;
}
.filter button{
  font-family:inherit;font-size:14px;font-weight:500;
  padding:10px 22px;border-radius:999px;border:1px solid rgba(0,0,0,0.14);
  background:transparent;color:var(--text-dark);cursor:pointer;
  transition:all 0.3s var(--ease);
}
.filter button:hover{border-color:rgba(0,0,0,0.4);}
.filter button.on{background:var(--graphite);color:#fff;border-color:var(--graphite);}
.works-grid{
  max-width:1200px;margin:0 auto;
  display:grid;grid-template-columns:repeat(3,1fr);gap:20px;
}
@media (max-width:1068px){.works-grid{grid-template-columns:repeat(2,1fr);}}
@media (max-width:735px){.works-grid{grid-template-columns:1fr;}}
.work-card{
  background:var(--white);border-radius:var(--radius);padding:32px 28px;
  transition:transform 0.3s var(--ease),box-shadow 0.3s var(--ease),opacity 0.3s;
  display:flex;flex-direction:column;
}
.work-card:hover{transform:translateY(-4px);box-shadow:0 20px 40px rgba(0,0,0,0.10);}
.work-card.hide{display:none;}
.work-tag{font-size:13px;font-weight:600;color:var(--red);letter-spacing:0.05em;margin-bottom:12px;}
.work-title{font-size:20px;font-weight:600;line-height:1.38;letter-spacing:-0.01em;}
.work-fact{margin-top:11px;font-size:15.5px;color:var(--gray-dark);line-height:1.68;flex:1;}

/* ============ 客户阵容 ============ */
.clients{background:var(--white);color:var(--text-dark);padding:140px 24px;}
.clients-head{text-align:center;max-width:820px;margin:0 auto 64px;}
.clients-grid{
  max-width:1200px;margin:0 auto;
  display:grid;grid-template-columns:repeat(3,1fr);gap:2px;
  background:rgba(0,0,0,0.06);border-radius:var(--radius);overflow:hidden;
}
@media (max-width:1068px){.clients-grid{grid-template-columns:repeat(2,1fr);}}
@media (max-width:735px){.clients-grid{grid-template-columns:1fr;}}
.client{
  background:var(--white);padding:34px 30px;
  transition:background 0.3s;
}
.client:hover{background:var(--cloud);}
.client-name{font-size:21px;font-weight:600;letter-spacing:-0.01em;}
.client-name span{font-size:14px;font-weight:500;color:var(--gray);margin-left:8px;letter-spacing:0.02em;}
.client-desc{margin-top:9px;font-size:15px;color:var(--gray-dark);line-height:1.6;}

/* ============ 履历 ============ */
.profile{background:var(--cloud);color:var(--text-dark);padding:140px 24px;}
.profile-grid{
  max-width:1100px;margin:0 auto;
  display:grid;grid-template-columns:380px 1fr;gap:72px;align-items:start;
}
@media (max-width:1068px){.profile-grid{grid-template-columns:1fr;max-width:640px;gap:48px;}}
.profile-photo{border-radius:var(--radius);overflow:hidden;position:sticky;top:88px;}
.profile-photo img{width:100%;}
.profile h2.headline{font-size:clamp(34px,4.4vw,56px);}

/* IAPP 认证矩阵：本节 signature，四项认证以 2×2 发丝线网格呈现 */
.cred-hero{
  margin-top:40px;background:var(--white);border-radius:var(--radius);
  padding:30px 34px 32px;box-shadow:0 1px 3px rgba(0,0,0,0.05);
}
.cred-hero-head{
  display:flex;align-items:baseline;justify-content:space-between;
  padding-bottom:20px;border-bottom:1px solid rgba(0,0,0,0.09);
}
.cred-hero-title{
  font-size:13.5px;font-weight:600;letter-spacing:0.12em;
  text-transform:uppercase;color:var(--gray);
}
.cred-count{font-size:13px;font-weight:600;color:var(--red);letter-spacing:0.06em;}
.cred-matrix{
  display:grid;grid-template-columns:1fr 1fr;gap:1px;
  background:rgba(0,0,0,0.10);margin-top:1px;
}
.cred-cell{background:var(--white);padding:24px 26px 22px;}
.cred-code{
  font-size:26px;font-weight:600;letter-spacing:0.005em;
  color:var(--text-dark);line-height:1;
}
.cred-code .slash{color:var(--gray);font-weight:500;margin:0 1px;}
.cred-name{margin-top:11px;font-size:16px;color:var(--gray-dark);font-weight:400;}
.cred-caption{margin-top:22px;font-size:13.5px;line-height:1.72;color:var(--gray);}

/* 辅助资历：2 列 meta 网格，安静收在 signature 之后 */
.cred-meta{margin-top:48px;display:grid;grid-template-columns:1fr 1fr;gap:38px 52px;}
.meta-group h4{
  font-size:13px;font-weight:600;color:var(--gray);letter-spacing:0.12em;
  text-transform:uppercase;margin-bottom:6px;
  padding-bottom:12px;border-bottom:1px solid rgba(0,0,0,0.09);
}
.meta-group ul{list-style:none;}
.meta-group li{padding:11px 0;}
.m-main{display:block;font-size:17px;font-weight:500;color:var(--text-dark);}
.m-sub{display:block;font-size:14px;color:var(--gray-dark);margin-top:2px;}
.profile-note{margin-top:44px;font-size:15.5px;color:var(--gray-dark);line-height:1.75;}
@media (max-width:735px){
  .cred-meta{grid-template-columns:1fr;gap:32px;}
  .cred-hero{padding:24px 20px 26px;}
  .cred-cell{padding:19px 14px;}
  .cred-code{font-size:22px;}
  .cred-name{font-size:14.5px;margin-top:9px;}
}

/* ============ 城市图 ============ */
.cityband{position:relative;height:64vh;min-height:360px;overflow:hidden;background:var(--ink);}
.cityband img{width:100%;height:110%;object-fit:cover;will-change:transform;}
/* 塔楼图上移取景，露出楼顶尖部（其余城市图保持居中裁切） */
.cityband--tower img{object-position:50% 15%;}
.cityband-cap{
  position:absolute;left:0;right:0;bottom:0;padding:56px 24px 40px;
  background:linear-gradient(180deg,rgba(0,0,0,0) 0%,rgba(0,0,0,0.62) 100%);
  text-align:center;color:rgba(245,245,247,0.92);
  font-size:15px;letter-spacing:0.08em;
}

/* ============ 著述 ============ */
.pubs{background:var(--black);padding:140px 24px;}
.pubs-head{max-width:980px;margin:0 auto 56px;}
.pub-list{max-width:980px;margin:0 auto;list-style:none;}
.pub-list li{
  display:flex;align-items:baseline;justify-content:space-between;gap:32px;
  padding:24px 4px;border-bottom:1px solid rgba(255,255,255,0.1);
  transition:padding 0.3s var(--ease);
}
.pub-list li:hover{padding-left:12px;}
.pub-title{font-size:19px;font-weight:500;line-height:1.5;}
.pub-src{font-size:14px;color:var(--gray);white-space:nowrap;}
@media (max-width:735px){.pub-list li{flex-direction:column;gap:6px;}.pub-src{white-space:normal;}}
.pubs-more{max-width:980px;margin:28px auto 0;font-size:15.5px;color:var(--gray);}

/* ============ 联系 ============ */
.contact{background:var(--black);padding:150px 24px 130px;text-align:center;}
.contact h2.headline{font-size:clamp(38px,5vw,68px);}
.contact-items{
  margin-top:52px;display:flex;justify-content:center;gap:64px;flex-wrap:wrap;
}
.contact-item{text-align:center;}
.contact-item .k{font-size:13px;color:var(--gray);letter-spacing:0.1em;margin-bottom:8px;}
.contact-item .v{font-size:19px;font-weight:500;}
.contact-item .v a:hover{color:var(--red);}
.contact-addr{margin-top:48px;font-size:14px;color:var(--gray);line-height:1.8;}

/* ============ 跨页桥段（两页共用） ============ */
.bridge{
  position:relative;min-height:80vh;display:flex;align-items:center;justify-content:center;
  overflow:hidden;background:var(--ink);text-align:center;
}
.bridge-bg{position:absolute;inset:0;}
.bridge-bg img{width:100%;height:110%;object-fit:cover;will-change:transform;}
.bridge-bg::after{content:"";position:absolute;inset:0;background:linear-gradient(180deg,rgba(0,0,0,0.55) 0%,rgba(0,0,0,0.38) 45%,rgba(0,0,0,0.74) 100%);}
.bridge-inner{position:relative;z-index:2;padding:130px 24px;max-width:860px;}
.bridge-eyebrow{color:var(--red);font-size:15px;font-weight:600;letter-spacing:0.12em;margin-bottom:22px;}
.bridge-title{font-size:clamp(32px,4.8vw,62px);font-weight:600;letter-spacing:-0.02em;line-height:1.14;color:#fff;text-wrap:balance;}
.bridge-sub{margin:24px auto 0;font-size:clamp(16px,1.8vw,20px);color:rgba(245,245,247,0.82);line-height:1.72;max-width:640px;}
.bridge-btn{
  display:inline-flex;align-items:center;gap:10px;margin-top:42px;
  padding:15px 34px;border-radius:999px;background:#fff;color:var(--ink);
  font-size:16px;font-weight:600;letter-spacing:0.01em;
  transition:transform 0.3s var(--ease),box-shadow 0.3s var(--ease);
}
.bridge-btn:hover{transform:translateY(-2px);box-shadow:0 16px 40px rgba(0,0,0,0.5);}
.bridge-btn svg{transition:transform 0.3s var(--ease);}
.bridge-btn:hover svg{transform:translateX(4px);}

/* ============ Footer ============ */
.footer{background:var(--cloud);color:var(--text-dark);padding:64px 24px 48px;}
.footer-inner{max-width:1200px;margin:0 auto;}
.footer-logo{height:44px;width:auto;}
.footer-firm{margin-top:20px;font-size:13.5px;color:var(--gray-dark);max-width:640px;line-height:1.7;}
.footer-legal{
  margin-top:36px;padding-top:24px;border-top:1px solid rgba(0,0,0,0.1);
  font-size:12px;color:var(--gray);display:flex;justify-content:space-between;flex-wrap:wrap;gap:12px;
}

/* ============ 动效 ============ */
.reveal{opacity:0;transform:translateY(24px);transition:opacity 0.8s var(--ease),transform 0.8s var(--ease);}
.reveal.in{opacity:1;transform:none;}
.reveal-d1{transition-delay:0.08s;}
.reveal-d2{transition-delay:0.16s;}
.reveal-d3{transition-delay:0.24s;}
@media (prefers-reduced-motion:reduce){
  .reveal{opacity:1;transform:none;transition:none;}
  .hero-scroll svg{animation:none;}
  html{scroll-behavior:auto;}
  .chapter-visual img,.cityband img,.bridge-bg img{transform:none !important;}
}
@media (max-width:735px){
  .section,.section-tight{padding:80px 20px;}
  .chapter-head{padding:96px 20px 48px;}
  .chapter-visual{height:52vh;}
  .works,.clients,.profile,.pubs{padding:90px 20px;}
  .contact{padding:100px 20px 90px;}
  .bridge-inner{padding:100px 20px;}
}