/* 瓴达官网 · 新首页(打样)独立样式表。不影响 style.css 旧页。 */
:root{
  --bg:#FBFAF7; --ink:#1A1A1A; --ink-2:#555; --ink-3:#6a6a6a;
  --accent:#C0392B;            /* 编辑红 */
  --dark:#0B1020; --dark-ink:#E8ECF6; --dark-ink-2:#9AA6C0; --dark-edge:#243056;
  --mint:#5EE7C4;
  --line:#ececec;
  --warm-chip-bg:#F4EEE4; --warm-chip-ink:#7a5a32; --warm-chip-edge:#e6dcc8;
  --note-bg:#FFF4E8; --note-edge:#E07A3F; --note-ink:#8a5a32;
  --serif:Georgia,'Songti SC','Source Han Serif SC','STSong',serif;
  --sans:'PingFang SC','Hiragino Sans GB','Microsoft YaHei',sans-serif;
  --mono:ui-monospace,'SF Mono',Menlo,Consolas,monospace;
  --wrap:1080px;
}
*{margin:0;padding:0;box-sizing:border-box;}
html{scroll-behavior:smooth;}
body{font-family:var(--sans);color:var(--ink);background:var(--bg);line-height:1.6;-webkit-font-smoothing:antialiased;-moz-osx-font-smoothing:grayscale;}
.serif{font-family:var(--serif);}
.mono{font-family:var(--mono);}
img{max-width:100%;display:block;}
a{color:inherit;text-decoration:none;}
a:focus-visible,button:focus-visible{outline:2px solid var(--accent);outline-offset:2px;}
.wrap{max-width:var(--wrap);margin:0 auto;padding:0 32px;}
.eyebrow{font-size:12px;letter-spacing:2px;text-transform:uppercase;color:var(--accent);margin-bottom:18px;}
.ph{background:repeating-linear-gradient(45deg,#eee,#eee 8px,#f6f6f6 8px,#f6f6f6 16px);border:1px dashed #ccc;display:flex;align-items:center;justify-content:center;color:#999;font-size:12px;text-align:center;}
.note{background:var(--note-bg);border-left:3px solid var(--note-edge);padding:8px 12px;font-size:12.5px;color:var(--note-ink);border-radius:0 6px 6px 0;}

/* 滚动渐显 */
.reveal{opacity:0;transform:translateY(16px);transition:opacity .6s ease,transform .6s ease;}
.reveal.visible{opacity:1;transform:none;}

/* anchor offset for sticky header */
section[id]{scroll-margin-top:72px;}

/* 通用区块标题 */
.sec{padding:64px 0;}
.sec h2{font-size:32px;font-weight:600;margin-bottom:10px;letter-spacing:-.3px;}
.sec .lead{color:var(--ink-2);font-size:16px;margin-bottom:36px;max-width:32em;}

@media (max-width:860px){
  .sec h2{font-size:26px;}
}
@media (prefers-reduced-motion:reduce){
  html{scroll-behavior:auto;}
  .reveal{opacity:1!important;transform:none!important;transition:none!important;}
  *,*::before,*::after{animation-duration:.01ms!important;animation-iteration-count:1!important;transition-duration:.01ms!important;}
}

/* header */
.site-header{position:sticky;top:0;z-index:50;background:rgba(251,250,247,.85);backdrop-filter:blur(8px);border-bottom:1px solid var(--line);}
.hd-inner{max-width:var(--wrap);margin:0 auto;padding:16px 32px;display:flex;align-items:center;justify-content:space-between;gap:20px;}
.logo{font-weight:700;font-size:18px;} .logo span{font-weight:400;color:var(--ink-3);font-size:13px;}
.hd-nav{display:flex;gap:26px;font-size:14px;color:var(--ink-2);}
.hd-nav a:hover{color:var(--ink);}
.hd-nav a[aria-current="page"]{color:var(--ink);font-weight:600;}
.hd-mobile a[aria-current="page"]{color:var(--accent);font-weight:600;}
.cta-sm{background:var(--ink);color:#fff;padding:9px 18px;border-radius:3px;font-size:13px;}
.hd-burger{display:none;flex-direction:column;gap:5px;background:none;border:0;cursor:pointer;padding:6px;}
.hd-burger span{width:22px;height:2px;background:var(--ink);display:block;}
.hd-mobile{display:none;flex-direction:column;gap:4px;padding:12px 32px 18px;border-top:1px solid var(--line);background:var(--bg);}
.hd-mobile a{padding:10px 0;font-size:15px;}
@media (max-width:760px){
  .hd-nav,.hd-inner>.cta-sm{display:none;}
  .hd-burger{display:flex;}
  .hd-mobile:not([hidden]){display:flex;}
}

/* hero */
.hero{padding:72px 0 60px;}
.hero h1{font-size:46px;font-weight:600;line-height:1.25;letter-spacing:-.5px;margin-bottom:22px;max-width:14em;font-family:var(--serif);}
.hero h1 em{font-style:normal;color:var(--accent);}
.hero .sub{font-size:18px;color:var(--ink-2);max-width:34em;margin-bottom:30px;}
.hero .btns{display:flex;gap:14px;align-items:center;flex-wrap:wrap;}
.btn-pri{background:var(--ink);color:#fff;padding:14px 26px;border-radius:3px;font-size:15px;font-weight:600;}
.btn-sec{font-size:15px;text-decoration:underline;text-underline-offset:4px;color:var(--ink);}
.proof{margin-top:28px;font-size:13px;color:var(--ink-3);letter-spacing:.5px;}
.proof span{color:var(--accent);}
.trust{border-top:1px solid var(--line);border-bottom:1px solid var(--line);background:#fff;}
.trust .wrap{padding:18px 32px;text-align:center;font-size:13.5px;color:var(--ink-3);}
.trust b{color:var(--ink);}
@media (max-width:860px){.hero h1{font-size:32px;}.hero .sub{font-size:16px;}}

/* pains */
.pains{display:grid;grid-template-columns:repeat(3,1fr);gap:18px;}
.pain{background:#fff;border:1px solid var(--line);border-radius:14px;padding:26px;}
.pain .n{font-size:13px;color:var(--accent);font-weight:700;margin-bottom:10px;}
.pain h3{font-size:17px;margin-bottom:8px;}
.pain p{font-size:14px;color:var(--ink-2);}
@media (max-width:860px){.pains{grid-template-columns:1fr;}}

/* method */
.method{background:var(--dark);color:var(--dark-ink);background-image:radial-gradient(circle at 1px 1px,rgba(120,150,255,.16) 1px,transparent 0);background-size:24px 24px;padding:72px 0;}
.method .eyebrow{color:var(--mint);}
.method h2{color:#fff;font-size:32px;font-weight:600;margin-bottom:8px;}
.method .lead{color:var(--dark-ink-2);margin-bottom:40px;max-width:32em;}
.steps{display:grid;grid-template-columns:repeat(5,1fr);gap:14px;}
.step{border:1px solid var(--dark-edge);border-radius:12px;padding:20px 16px;background:rgba(255,255,255,.02);}
.step .k{font-size:12px;color:var(--mint);margin-bottom:10px;}
.step h4{font-size:15px;color:#fff;margin-bottom:6px;}
.step p{font-size:12.5px;color:var(--dark-ink-2);}
.method .guard{margin-top:28px;font-size:13px;color:var(--dark-ink-2);}
.method .guard b{color:var(--mint);font-weight:600;}
@media (max-width:860px){.steps{grid-template-columns:repeat(auto-fit,minmax(150px,1fr));}.method h2{font-size:26px;}}

/* caps (Task 7) */
.caps{display:grid;grid-template-columns:repeat(4,1fr);gap:16px;margin-top:14px;}
.cap{border:1px solid var(--line);border-radius:14px;padding:22px;background:#fff;}
.cap .ico{width:40px;height:40px;border-radius:10px;background:var(--warm-chip-bg);color:var(--ink);display:flex;align-items:center;justify-content:center;margin-bottom:14px;}
.cap .ico svg{width:22px;height:22px;}
.cap h4{font-size:15.5px;margin-bottom:6px;}
.cap p{font-size:13px;color:var(--ink-2);}
@media (max-width:860px){.caps{grid-template-columns:1fr 1fr;}}

/* founder (Task 8) */
.founder{display:grid;grid-template-columns:200px 1fr;gap:36px;align-items:center;background:#fff;border:1px solid var(--line);border-radius:18px;padding:36px;}
.founder .photo{width:200px;height:200px;border-radius:14px;}
.founder .quote{font-size:22px;line-height:1.5;margin-bottom:16px;}
.founder .quote em{font-style:normal;background:#FBF0D8;padding:0 4px;}
.founder .bio{color:var(--ink-2);font-size:14px;}
.creds{display:flex;flex-wrap:wrap;gap:8px;margin-top:14px;}
.creds span{font-size:12px;padding:5px 11px;border-radius:99px;background:var(--warm-chip-bg);color:var(--warm-chip-ink);border:1px solid var(--warm-chip-edge);}
.founder .name{font-weight:700;margin-top:14px;}
@media (max-width:760px){.founder{grid-template-columns:1fr;}.founder .photo{width:140px;height:140px;}}

/* why / final / footer (Task 9) */
.why{display:grid;grid-template-columns:1fr 1fr;gap:18px;}
.why .item{display:flex;gap:12px;}
.why .b{width:8px;height:8px;border-radius:99px;background:var(--accent);margin-top:9px;flex:none;}
.why h4{font-size:16px;} .why p{font-size:13.5px;color:var(--ink-2);}
.final{background:var(--ink);color:#fff;text-align:center;padding:72px 0;}
.final h2{font-size:34px;color:#fff;font-weight:600;margin-bottom:24px;}
.final .final-sub{font-size:15px;color:#bbb;max-width:34em;margin:0 auto 26px;}
.final .final-sub b{color:#fff;}
.final .btn-pri{background:#fff;color:var(--ink);}
.contact-line{margin-top:22px;font-size:13.5px;color:#aaa;}
.site-footer{background:#0a0a0a;color:#777;font-size:12px;padding:26px 0;text-align:center;}
.site-footer a{color:#999;text-decoration:underline;}
@media (max-width:760px){.why{grid-template-columns:1fr;}.final h2{font-size:26px;}}

/* ============================================================
   子页面组件(追加)— 沿用既有令牌与断点(760/860)
   ============================================================ */

/* 语言切换下拉(header) */
.lang-switcher{position:relative;}
.lang-btn{display:inline-flex;align-items:center;gap:6px;background:none;border:1px solid var(--line);border-radius:3px;padding:7px 12px;font-size:13px;color:var(--ink-2);font-family:var(--sans);cursor:pointer;line-height:1;}
.lang-btn:hover{color:var(--ink);border-color:#d8d8d8;}
.lang-btn .caret{font-size:9px;color:var(--ink-3);transition:transform .2s ease;}
.lang-switcher.active .lang-btn .caret{transform:rotate(180deg);}
.lang-menu{position:absolute;top:calc(100% + 8px);right:0;min-width:140px;background:#fff;border:1px solid var(--line);border-radius:8px;box-shadow:0 8px 24px rgba(0,0,0,.08);padding:6px;display:none;flex-direction:column;gap:2px;z-index:60;}
.lang-switcher.active .lang-menu{display:flex;}
.lang-menu a{padding:8px 12px;font-size:13.5px;color:var(--ink-2);border-radius:5px;}
.lang-menu a:hover{background:var(--bg);color:var(--ink);}
.lang-menu a.active{color:var(--accent);font-weight:600;}
@media (max-width:760px){.lang-switcher{display:none;}}

/* 内页页头(紧凑 hero) */
.page-header{padding:64px 0 56px;border-bottom:1px solid var(--line);}
.page-header h1{font-family:var(--serif);font-size:38px;font-weight:600;line-height:1.25;letter-spacing:-.5px;margin-bottom:18px;max-width:16em;}
.page-header h1 em{font-style:normal;color:var(--accent);}
.page-header .sub{font-size:17px;color:var(--ink-2);max-width:36em;}
@media (max-width:860px){.page-header{padding:48px 0 40px;}.page-header h1{font-size:28px;}.page-header .sub{font-size:15px;}}

/* 解决方案:交替左右块 */
.solution{display:grid;grid-template-columns:1.15fr .85fr;gap:48px;align-items:center;padding:56px 0;border-bottom:1px solid var(--line);}
.solution:last-of-type{border-bottom:0;}
.solution.alt{grid-template-columns:.85fr 1.15fr;}
.solution.alt .solution-text{order:2;}
.solution.alt .solution-visual{order:1;}
.solution-label{font-size:12px;letter-spacing:2px;text-transform:uppercase;color:var(--accent);font-family:var(--mono);margin-bottom:14px;}
.solution h3{font-family:var(--serif);font-size:26px;font-weight:600;line-height:1.3;margin-bottom:22px;letter-spacing:-.3px;}
.solution-lines{display:flex;flex-direction:column;gap:16px;}
.solution-lines .line .k{font-size:12.5px;font-weight:700;color:var(--ink);margin-bottom:4px;}
.solution-lines .line p{font-size:14px;color:var(--ink-2);}
.solution-visual{background:var(--warm-chip-bg);border-radius:14px;display:flex;align-items:center;justify-content:center;padding:24px;min-height:220px;}
.solution-visual svg{width:100%;height:auto;max-width:440px;}
@media (max-width:860px){
  .solution,.solution.alt{grid-template-columns:1fr;gap:28px;padding:40px 0;}
  .solution.alt .solution-text{order:1;}
  .solution.alt .solution-visual{order:2;}
  .solution h3{font-size:22px;}
  .solution-visual{min-height:180px;padding:18px;}
}

/* 关于页:价值卡 */
.value-grid{display:grid;grid-template-columns:repeat(4,1fr);gap:16px;margin-top:14px;}
.value{border:1px solid var(--line);border-radius:14px;padding:24px;background:#fff;}
.value .n{font-size:13px;color:var(--accent);font-weight:700;font-family:var(--mono);margin-bottom:12px;}
.value h4{font-size:16px;margin-bottom:8px;}
.value p{font-size:13.5px;color:var(--ink-2);}
@media (max-width:860px){.value-grid{grid-template-columns:1fr 1fr;}}
@media (max-width:760px){.value-grid{grid-template-columns:1fr;}}

/* 工作方式:步骤详解卡(深色面,沿用 method 风格) */
.method-detail{display:flex;gap:24px;border:1px solid var(--dark-edge);border-radius:14px;padding:28px;background:rgba(255,255,255,.02);margin-bottom:16px;}
.method-detail .num{font-family:var(--mono);font-size:34px;font-weight:700;color:var(--mint);line-height:1;flex:none;width:56px;}
.method-detail .md-body{flex:1;}
.method-detail h3{font-size:19px;color:#fff;margin-bottom:14px;}
.method-detail .md-row{margin-bottom:12px;}
.method-detail .md-row:last-child{margin-bottom:0;}
.method-detail .md-row .k{font-size:12px;letter-spacing:1px;color:var(--mint);font-family:var(--mono);margin-bottom:4px;}
.method-detail .md-row p{font-size:14px;color:var(--dark-ink);}
@media (max-width:760px){.method-detail{flex-direction:column;gap:14px;padding:22px;}.method-detail .num{font-size:28px;width:auto;}}

/* 联系页:表单 + 直接联系 两栏 */
.contact-grid{display:grid;grid-template-columns:1.2fr .8fr;gap:48px;align-items:start;}
.form-row{margin-bottom:18px;}
.form-row.two{display:grid;grid-template-columns:1fr 1fr;gap:18px;}
.form-label{display:block;font-size:13px;color:var(--ink);margin-bottom:7px;}
.form-label .req{color:var(--accent);}
.form-input,.form-select,.form-textarea{width:100%;font-family:var(--sans);font-size:14.5px;color:var(--ink);background:#fff;border:1px solid var(--line);border-radius:6px;padding:11px 13px;line-height:1.4;}
.form-textarea{min-height:120px;resize:vertical;}
.form-select{appearance:none;background-image:url("data:image/svg+xml;utf8,<svg xmlns='http://www.w3.org/2000/svg' width='10' height='6' viewBox='0 0 10 6'><path d='M1 1l4 4 4-4' fill='none' stroke='%236a6a6a' stroke-width='1.5'/></svg>");background-repeat:no-repeat;background-position:right 13px center;padding-right:34px;}
.form-input:focus,.form-select:focus,.form-textarea:focus{outline:none;border-color:var(--accent);box-shadow:0 0 0 3px rgba(192,57,43,.12);}
.form-input.error,.form-select.error,.form-textarea.error{border-color:var(--accent);background:#fdf5f4;}
.form-error{color:var(--accent);font-size:13px;margin-bottom:12px;}
.form-error[hidden]{display:none;}
.contact-form .btn-pri{border:0;cursor:pointer;font-family:var(--sans);}
.contact-info{background:#fff;border:1px solid var(--line);border-radius:16px;padding:30px;}
.contact-info h3{font-family:var(--serif);font-size:20px;margin-bottom:18px;}
.contact-info .ci-row{margin-bottom:16px;font-size:14px;color:var(--ink-2);}
.contact-info .ci-row .k{font-size:12px;color:var(--ink-3);letter-spacing:1px;text-transform:uppercase;margin-bottom:3px;}
.contact-info .ci-row a{color:var(--ink);text-decoration:underline;text-underline-offset:3px;}
.contact-info .ci-qr{width:140px;height:140px;border-radius:10px;margin-top:6px;}
.contact-info .ci-maps a{margin-right:14px;font-size:13px;color:var(--accent);text-decoration:underline;text-underline-offset:3px;}
@media (max-width:860px){.contact-grid{grid-template-columns:1fr;gap:28px;}.form-row.two{grid-template-columns:1fr;}}

/* 联系表单 — 微信二维码模态(移植自 main.js 逻辑) */
.contact-modal{position:fixed;inset:0;z-index:1000;display:flex;align-items:center;justify-content:center;padding:24px;}
.contact-modal-overlay{position:absolute;inset:0;background:rgba(11,16,32,.55);backdrop-filter:blur(2px);}
.contact-modal-content{position:relative;z-index:1;background:#fff;border-radius:16px;padding:32px;max-width:380px;width:100%;text-align:center;box-shadow:0 20px 60px rgba(0,0,0,.25);}
.contact-modal-content h3{font-family:var(--serif);font-size:20px;margin-bottom:10px;}
.contact-modal-content p{font-size:14px;color:var(--ink-2);margin-bottom:18px;}
.wechat-qr-placeholder{width:180px;height:180px;margin:0 auto 20px;border:1px solid var(--line);border-radius:10px;display:flex;align-items:center;justify-content:center;overflow:hidden;}
.wechat-qr-placeholder img{width:100%;height:100%;object-fit:contain;}
.contact-modal-content .contact-modal-close{background:var(--ink);color:#fff;border:0;cursor:pointer;font-family:var(--sans);font-size:14px;font-weight:600;padding:11px 28px;border-radius:3px;}

/* 微信主路径区块(contact-info 置顶) */
.ci-wechat{background:var(--warm-chip-bg);border:1px solid var(--warm-chip-edge);border-radius:12px;padding:22px;margin-bottom:22px;text-align:center;}
.ci-wechat .ci-wechat-label{font-size:12px;color:var(--ink-3);letter-spacing:1px;text-transform:uppercase;margin-bottom:12px;}
.ci-wechat .ci-qr-big{width:190px;height:190px;border-radius:12px;margin:0 auto 12px;background:#fff;padding:8px;}
.ci-wechat .ci-wechat-tip{font-size:14px;color:var(--ink);font-weight:600;margin-bottom:4px;}
.ci-wechat .ci-wechat-mobile-tip{font-size:12.5px;color:var(--ink-3);margin-bottom:14px;}
.ci-wechat-id{display:flex;align-items:center;justify-content:center;gap:8px;flex-wrap:wrap;font-size:13.5px;color:var(--ink-2);}
.ci-wechat-id .ci-id-val{font-family:var(--mono);color:var(--ink);background:#fff;border:1px solid var(--warm-chip-edge);border-radius:6px;padding:4px 10px;}
.copy-wechat-btn{background:var(--ink);color:#fff;border:0;cursor:pointer;font-family:var(--sans);font-size:12.5px;font-weight:600;padding:6px 14px;border-radius:5px;line-height:1.2;}
.copy-wechat-btn:hover{opacity:.9;}
.copy-wechat-btn.copied{background:var(--note-edge);}

/* 表单上方"想更快"引导 */
.form-wechat-hint{font-size:14px;color:var(--ink-2);margin-bottom:18px;}
.form-wechat-hint a{color:var(--accent);font-weight:600;text-decoration:underline;text-underline-offset:3px;}

/* 诊断 offer 区块 */
.offer-block{background:var(--note-bg);border:1px solid var(--note-edge);border-radius:12px;padding:18px 20px;margin-bottom:26px;}
.offer-block .offer-head{font-size:15px;font-weight:700;color:var(--ink);margin-bottom:8px;}
.offer-block .offer-body{font-size:13.5px;color:var(--note-ink);line-height:1.7;}
.offer-block .offer-body b{color:var(--ink);}
.offer-block .offer-free{color:var(--accent);font-weight:600;}
/* 首页深色 final 区内的 offer 变体 */
.final .offer-block{background:rgba(255,255,255,.06);border-color:var(--dark-edge);text-align:left;max-width:38em;margin:0 auto 26px;}
.final .offer-block .offer-head{color:#fff;}
.final .offer-block .offer-body{color:var(--dark-ink-2);}
.final .offer-block .offer-body b{color:#fff;}
.final .offer-block .offer-free{color:var(--mint);}

/* 模态内微信主路径 + 复制按钮 */
.contact-modal-content .modal-wechat-id{display:flex;align-items:center;justify-content:center;gap:8px;flex-wrap:wrap;font-size:13px;color:var(--ink-2);margin-bottom:18px;}
.contact-modal-content .modal-wechat-id .ci-id-val{font-family:var(--mono);color:var(--ink);background:var(--bg);border:1px solid var(--line);border-radius:6px;padding:4px 10px;}
.contact-modal-content .modal-mailto-fallback{display:block;margin-top:14px;font-size:13px;color:var(--ink-3);text-decoration:underline;text-underline-offset:3px;}

/* SEO 包 · 可见 FAQ(services 页;纯 <dl>,无 JS) */
.faq{max-width:46em;}
.faq dl{margin-top:8px;}
.faq dt{font-family:var(--serif);font-size:17px;font-weight:600;color:var(--ink);margin-top:22px;}
.faq dt:first-of-type{margin-top:0;}
.faq dd{margin:8px 0 0;font-size:14px;color:var(--ink-2);line-height:1.75;}
.faq dd + dt{border-top:1px solid var(--line);padding-top:22px;}

/* ============================================================
   AI 痛点速诊 demo
   ============================================================ */
.diagnose{padding:56px 0;background:#fff;border-top:1px solid var(--line);border-bottom:1px solid var(--line);}
.diag-card{max-width:680px;margin:22px auto 0;border:1px solid var(--line);border-radius:16px;padding:24px;background:var(--bg);}
.diag-row{margin-bottom:14px;}
.diag-row .opt{color:var(--ink-3);font-weight:400;font-size:12px;}
.diag-submit{margin-top:6px;border:0;cursor:pointer;}
.diag-hint{margin-top:10px;font-size:12px;color:var(--ink-3);}
.diag-result{margin-top:20px;}
.diag-item{padding:12px 14px;border-radius:10px;margin-bottom:9px;font-size:14px;line-height:1.5;border:1px solid var(--line);}
.diag-item.go{background:linear-gradient(135deg,rgba(0,180,148,.10),rgba(0,180,148,.04));border-color:rgba(0,180,148,.4);}
.diag-item.no{background:rgba(255,107,53,.08);border-color:rgba(255,107,53,.4);}
.diag-item.eff{background:var(--warm-chip-bg);border-color:var(--warm-chip-edge);}
.diag-item .t{font-weight:700;}
.diag-badge{font-size:10px;padding:1px 7px;border-radius:99px;margin-right:6px;color:#fff;}
.diag-badge.g{background:#00B894;}.diag-badge.n{background:#FF6B35;}
.diag-loading{font-size:14px;color:var(--ink-2);padding:16px 0;}
.diag-disclaimer{font-size:12px;color:var(--ink-3);margin-bottom:12px;}
.diag-capture{margin-top:16px;padding:16px;border-radius:12px;background:var(--dark);color:var(--dark-ink);}
.diag-capture input{width:100%;padding:9px 11px;border-radius:7px;border:1px solid var(--dark-edge);background:#0f1530;color:#fff;font-size:13px;margin:8px 0;}
.diag-capture .cbtn{background:var(--mint);color:#04201a;border:0;cursor:pointer;padding:9px 16px;border-radius:6px;font-size:13px;font-weight:700;}
.diag-fallback{margin-top:14px;font-size:13px;color:var(--ink-2);}
@media(max-width:600px){.diag-card{padding:18px;}}