/* ============ 基础 ============ */
:root{
  --ink:#0f172a;
  --ink-soft:#475569;
  --bg:#f8fafc;
  --bg-alt:#eef2f7;
  --navy:#0e1a33;
  --navy-2:#14264a;
  --teal:#14b8a6;
  --teal-2:#0d9488;
  --amber:#f59e0b;
  --rose:#f43f5e;
  --sky:#0ea5e9;
  --indigo:#6366f1;
  --emerald:#10b981;
  --card:#ffffff;
  --line:#e2e8f0;
  --radius:16px;
  --shadow:0 10px 30px rgba(15,23,42,.08);
  --shadow-lg:0 24px 60px rgba(15,23,42,.16);
  --font:"Inter","PingFang SC","Hiragino Sans GB","Microsoft YaHei",-apple-system,"Segoe UI",Roboto,Helvetica,Arial,sans-serif;
}
*{margin:0;padding:0;box-sizing:border-box}
html{scroll-behavior:smooth}
body{font-family:var(--font);color:var(--ink);background:var(--bg);line-height:1.7;-webkit-font-smoothing:antialiased}
img{max-width:100%}
.container{width:min(1160px,92%);margin:0 auto}
section{scroll-margin-top:76px}
h1,h2,h3{line-height:1.3;letter-spacing:-.01em}

/* ============ 导航 ============ */
.site-nav{position:fixed;inset:0 0 auto 0;z-index:100;background:rgba(14,26,51,.85);backdrop-filter:blur(12px);-webkit-backdrop-filter:blur(12px);border-bottom:1px solid rgba(255,255,255,.08)}
.nav-inner{display:flex;align-items:center;justify-content:space-between;height:64px}
.brand{display:flex;align-items:center;gap:10px;text-decoration:none}
.brand-mark{width:30px;height:30px;border-radius:9px;background:linear-gradient(135deg,var(--teal),var(--indigo));position:relative;flex:none}
.brand-mark::before,.brand-mark::after{content:"";position:absolute;background:#fff;border-radius:50%}
.brand-mark::before{width:8px;height:8px;top:6px;left:11px}
.brand-mark::after{width:5px;height:5px;bottom:5px;left:5px;box-shadow:12px 2px 0 #fff,6px -2px 0 #fff}
.brand-text{color:#fff;font-weight:800;font-size:17px;letter-spacing:.02em;display:flex;align-items:baseline;gap:8px}
.brand-text small{font-weight:500;font-size:11px;color:#8ea3c8;letter-spacing:.08em}
.nav-links{display:flex;align-items:center;gap:26px}
.nav-links a{color:#c3d0e8;text-decoration:none;font-size:14.5px;font-weight:500;transition:color .2s}
.nav-links a:hover{color:#fff}
.nav-links .nav-cta{background:linear-gradient(135deg,var(--teal),var(--teal-2));color:#fff;padding:8px 18px;border-radius:999px;font-weight:600}
.nav-links .nav-cta:hover{color:#fff;transform:translateY(-1px)}
.nav-toggle{display:none;background:none;border:0;cursor:pointer;width:40px;height:40px;flex-direction:column;align-items:center;justify-content:center;gap:5px}
.nav-toggle span{display:block;width:22px;height:2px;background:#fff;border-radius:2px;transition:.3s}

/* ============ Hero ============ */
.hero{position:relative;min-height:100vh;display:flex;align-items:center;background:radial-gradient(1200px 600px at 75% -10%,#1d3a70 0%,transparent 60%),radial-gradient(900px 500px at 10% 110%,#123a44 0%,transparent 55%),linear-gradient(160deg,var(--navy) 0%,#0a1224 100%);color:#fff;overflow:hidden}
#heroNet{position:absolute;inset:0;width:100%;height:100%}
.hero-bg-glow{position:absolute;inset:0;background:radial-gradient(600px 400px at 80% 40%,rgba(20,184,166,.14),transparent 70%)}
.hero-inner{position:relative;z-index:2;padding:120px 0 90px}
.hero-eyebrow{display:inline-block;color:#7dd3c0;font-size:14px;font-weight:600;letter-spacing:.14em;border:1px solid rgba(125,211,192,.4);padding:6px 14px;border-radius:999px;margin-bottom:22px}
.hero-title{font-size:clamp(34px,6vw,60px);font-weight:800;line-height:1.18;margin-bottom:22px}
.hero-title .grad{background:linear-gradient(120deg,#5eead4,#818cf8,#fbbf24);-webkit-background-clip:text;background-clip:text;-webkit-text-fill-color:transparent}
.hero-sub{font-size:clamp(15px,1.6vw,18px);color:#b7c4de;max-width:640px;margin-bottom:34px}
.hero-sub strong{color:#e6edf9}
.hero-actions{display:flex;gap:14px;flex-wrap:wrap;margin-bottom:56px}
.btn{display:inline-block;padding:13px 26px;border-radius:999px;font-weight:600;text-decoration:none;font-size:15.5px;transition:.25s;border:0;cursor:pointer}
.btn-primary{background:linear-gradient(135deg,#2dd4bf,#0d9488);color:#052e2a;box-shadow:0 10px 24px rgba(20,184,166,.35)}
.btn-primary:hover{transform:translateY(-2px);box-shadow:0 14px 30px rgba(20,184,166,.45)}
.btn-ghost{border:1px solid rgba(255,255,255,.28);color:#e6edf9;background:rgba(255,255,255,.04)}
.btn-ghost:hover{background:rgba(255,255,255,.1);transform:translateY(-2px)}
.hero-stats{display:flex;gap:44px;flex-wrap:wrap}
.stat b{display:block;font-size:30px;font-weight:800;background:linear-gradient(120deg,#5eead4,#a5b4fc);-webkit-background-clip:text;background-clip:text;-webkit-text-fill-color:transparent}
.stat span{font-size:13px;color:#8ea3c8}

/* ============ 通用 section ============ */
.section{padding:96px 0}
.section-alt{background:var(--bg-alt)}
.section-dark{background:linear-gradient(170deg,var(--navy) 0%,#0d1730 100%);color:#fff}
.section-head{max-width:720px;margin:0 auto 52px;text-align:center}
.section-head.light{color:#fff}
.section-tag{display:inline-block;font-size:12.5px;font-weight:700;letter-spacing:.16em;color:var(--teal-2);background:rgba(20,184,166,.1);padding:5px 14px;border-radius:999px;margin-bottom:16px}
.section-dark .section-tag{color:#5eead4;background:rgba(94,234,212,.1)}
.section-head h2{font-size:clamp(26px,3.6vw,38px);font-weight:800;margin-bottom:14px}
.section-desc{color:var(--ink-soft);font-size:16px}
.section-dark .section-desc{color:#aebbd8}
.section-desc b{color:var(--ink)}
.section-dark .section-desc b{color:#fff}

/* 方法：核心思想 */
.method-idea{background:var(--card);border:1px solid var(--line);border-radius:var(--radius);box-shadow:var(--shadow);padding:28px 30px;margin-bottom:44px;text-align:center}
.idea-note{display:flex;align-items:center;justify-content:center;gap:14px;flex-wrap:wrap;margin-bottom:12px}
.idea-word{background:linear-gradient(135deg,#f0fdfa,#ecfeff);border:1px solid #99f6e4;color:#0d9488;font-weight:700;font-size:17px;padding:10px 20px;border-radius:12px}
.idea-bridge{color:#94a3b8;font-size:20px}
.idea-caption{color:var(--ink-soft);font-size:14.5px}
.idea-caption b{color:var(--teal-2)}

/* 五大维度 */
.dim-grid{display:grid;grid-template-columns:repeat(auto-fit,minmax(300px,1fr));gap:22px}
.dim-card{background:var(--card);border:1px solid var(--line);border-radius:var(--radius);padding:28px;box-shadow:var(--shadow);transition:.3s;position:relative;overflow:hidden}
.dim-card::before{content:"";position:absolute;inset:0 0 auto 0;height:4px;background:var(--cat,var(--teal))}
.dim-card:hover{transform:translateY(-5px);box-shadow:var(--shadow-lg)}
.dim-ico{font-size:30px;margin-bottom:14px}
.dim-card h3{font-size:19px;margin-bottom:10px}
.dim-card p{color:var(--ink-soft);font-size:14.5px}
.dim-ex{display:block;margin-top:14px;font-size:13px;color:var(--teal-2);background:#f0fdfa;border-radius:8px;padding:8px 12px}
.dim-card[data-cat="morph"]{--cat:var(--emerald)}
.dim-card[data-cat="sem"]{--cat:var(--indigo)}
.dim-card[data-cat="scene"]{--cat:var(--amber)}
.dim-card[data-cat="pho"]{--cat:var(--rose)}
.dim-card[data-cat="col"]{--cat:var(--sky)}

/* ============ 互动演示 ============ */
.demo-wrap{display:grid;grid-template-columns:330px 1fr;gap:24px;background:rgba(255,255,255,.045);border:1px solid rgba(255,255,255,.1);border-radius:22px;padding:24px;backdrop-filter:blur(4px)}
.demo-side{display:flex;flex-direction:column;gap:16px;min-width:0}
.demo-center-card{background:linear-gradient(150deg,rgba(20,184,166,.16),rgba(99,102,241,.14));border:1px solid rgba(94,234,212,.35);border-radius:16px;padding:20px;position:relative;text-align:center}
.demo-back{position:absolute;left:14px;top:14px;background:rgba(255,255,255,.08);border:1px solid rgba(255,255,255,.18);color:#dbe6f5;border-radius:999px;padding:5px 14px;font-size:13px;cursor:pointer;transition:.2s}
.demo-back:hover{background:rgba(255,255,255,.16);color:#fff}
.demo-back:disabled{opacity:.35;cursor:default}
.demo-word{font-size:46px;font-weight:800;color:#fff;letter-spacing:.01em;line-height:1.1;margin-top:10px}
.demo-phonetic{color:#5eead4;font-size:15px;margin:4px 0 6px;font-family:"Inter",monospace}
.demo-meaning{color:#c9d6ec;font-size:15px}
.demo-crumbs{margin-top:12px;display:flex;flex-wrap:wrap;justify-content:center;gap:6px;font-size:12px;color:#8ea3c8}
.demo-crumbs span{background:rgba(255,255,255,.07);padding:3px 9px;border-radius:999px}
.demo-filters{display:flex;flex-wrap:wrap;gap:8px}
.chip{background:rgba(255,255,255,.06);border:1px solid rgba(255,255,255,.14);color:#c3d0e8;border-radius:999px;padding:6px 13px;font-size:13px;cursor:pointer;transition:.2s;font-family:var(--font)}
.chip:hover{background:rgba(255,255,255,.12)}
.chip.active{background:rgba(94,234,212,.18);border-color:#5eead4;color:#5eead4;font-weight:600}
.demo-links{list-style:none;display:flex;flex-direction:column;gap:8px;overflow-y:auto;max-height:430px;padding-right:4px}
.demo-links::-webkit-scrollbar{width:6px}
.demo-links::-webkit-scrollbar-thumb{background:rgba(255,255,255,.16);border-radius:3px}
.demo-link{display:flex;align-items:center;gap:10px;background:rgba(255,255,255,.05);border:1px solid rgba(255,255,255,.1);border-radius:12px;padding:10px 14px;cursor:pointer;transition:.2s;color:#dbe6f5}
.demo-link:hover{background:rgba(255,255,255,.1);transform:translateX(3px)}
.demo-link .dot{width:9px;height:9px;border-radius:50%;flex:none}
.demo-link .lw{font-weight:700;font-size:15px}
.demo-link .lt{font-size:12px;color:#8ea3c8;margin-left:auto;flex:none}
.demo-link.is-hub .lw::after{content:"✦";font-size:10px;color:#fbbf24;margin-left:5px}
.demo-empty{color:#8ea3c8;font-size:13.5px;text-align:center;padding:24px 0}
.demo-canvas{position:relative;border-radius:16px;background:radial-gradient(700px 400px at 50% 30%,rgba(20,184,166,.07),transparent 70%),rgba(5,10,25,.6);border:1px solid rgba(255,255,255,.08);min-height:560px;overflow:hidden}
#netSvg{width:100%;height:100%;display:block;min-height:560px}
.net-center-group{cursor:default}
.net-node{cursor:pointer}
.net-node circle{transition:r .25s,fill .25s,opacity .3s}
.net-node text{pointer-events:none}
.net-node:hover circle{stroke:#fff;stroke-width:2.5}
.net-node:hover text{font-weight:700}
.net-edge{opacity:0;transition:opacity .4s}
.net-edge.visible{opacity:.55}
.net-edge-label{opacity:0;transition:opacity .4s;pointer-events:none}
.net-edge-label.visible{opacity:.85}
.node-tip{position:absolute;top:20px;right:20px;width:250px;background:rgba(10,18,38,.96);border:1px solid rgba(255,255,255,.18);border-radius:14px;padding:18px;box-shadow:var(--shadow-lg);backdrop-filter:blur(8px);z-index:10;pointer-events:none}
.node-tip button{pointer-events:auto}
.tip-close{position:absolute;top:8px;right:10px;background:none;border:0;color:#8ea3c8;font-size:20px;cursor:pointer;line-height:1}
.tip-close:hover{color:#fff}
.tip-word{font-size:24px;font-weight:800;color:#fff}
.tip-phonetic{color:#5eead4;font-size:13px;margin:2px 0 6px}
.tip-meaning{color:#c9d6ec;font-size:14px}
.tip-edge{display:inline-block;margin-top:10px;font-size:12px;color:#fbbf24;background:rgba(251,191,36,.12);border:1px solid rgba(251,191,36,.3);border-radius:999px;padding:3px 10px}
.tip-go{margin-top:14px;width:100%;background:linear-gradient(135deg,#2dd4bf,#0d9488);color:#052e2a;border:0;border-radius:999px;padding:9px 0;font-weight:700;font-size:14px;cursor:pointer;transition:.2s;font-family:var(--font)}
.tip-go:hover{filter:brightness(1.1)}
.demo-hint{margin-top:18px;text-align:center;color:#8ea3c8;font-size:13.5px}
.demo-hint span{padding:2px 8px;border-radius:6px;margin:0 3px}
.hint-m{background:rgba(16,185,129,.15);color:#6ee7b7}
.hint-s{background:rgba(99,102,241,.15);color:#a5b4fc}
.hint-c{background:rgba(245,158,11,.15);color:#fcd34d}
.hint-p{background:rgba(244,63,94,.15);color:#fda4af}
.hint-l{background:rgba(14,165,233,.15);color:#7dd3fc}

/* ============ 词网示例 ============ */
.example-grid{display:grid;grid-template-columns:repeat(auto-fit,minmax(215px,1fr));gap:20px}
.example-card{background:var(--card);border:1px solid var(--line);border-radius:var(--radius);padding:24px;cursor:pointer;transition:.3s;box-shadow:var(--shadow);position:relative;overflow:hidden}
.example-card::after{content:"";position:absolute;right:-30px;top:-30px;width:110px;height:110px;border-radius:50%;background:radial-gradient(circle at center,var(--ec,rgba(20,184,166,.14)),transparent 70%)}
.example-card:hover{transform:translateY(-5px);box-shadow:var(--shadow-lg);border-color:#99f6e4}
.example-card .ex-en{font-size:28px;font-weight:800;color:var(--ink);display:flex;align-items:center;gap:8px}
.example-card .ex-en::after{content:"↗";font-size:16px;color:#94a3b8;margin-left:auto}
.example-card .ex-zh{color:var(--ink-soft);font-size:14px;margin-top:4px}
.example-card .ex-count{margin-top:14px;display:inline-block;font-size:12.5px;color:var(--teal-2);background:#f0fdfa;border-radius:999px;padding:4px 12px}
.example-card:hover .ex-en::after{color:var(--teal-2);transform:translate(2px,-2px)}

/* ============ 学习步骤 ============ */
.steps-grid{display:grid;grid-template-columns:repeat(auto-fit,minmax(230px,1fr));gap:22px;margin-bottom:40px}
.step-card{background:var(--card);border:1px solid var(--line);border-radius:var(--radius);padding:28px;box-shadow:var(--shadow);position:relative}
.step-num{font-size:15px;font-weight:800;color:#fff;background:linear-gradient(135deg,var(--teal),var(--indigo));width:44px;height:44px;border-radius:12px;display:flex;align-items:center;justify-content:center;margin-bottom:16px;letter-spacing:0}
.step-card h3{font-size:18px;margin-bottom:10px}
.step-card p{color:var(--ink-soft);font-size:14.5px}
.tip-strip{display:flex;gap:16px;align-items:flex-start;background:linear-gradient(120deg,#fffbeb,#fef3c7);border:1px solid #fde68a;border-radius:var(--radius);padding:22px 26px}
.tip-strip-ico{font-size:28px;line-height:1.2}
.tip-strip p{font-size:14.5px;color:#78350f}
.tip-strip b{color:#92400e}

/* ============ 关于 ============ */
.about-wrap{display:grid;grid-template-columns:1.1fr .9fr;gap:56px;align-items:center}
.about-text h2{font-size:clamp(24px,3vw,34px);margin-bottom:18px}
.about-text p{color:var(--ink-soft);font-size:15.5px;margin-bottom:14px}
.about-text p b{color:var(--ink)}
.about-points{list-style:none;margin:18px 0 28px;display:flex;flex-direction:column;gap:10px}
.about-points li{font-size:15px;color:var(--ink)}
.about-visual{display:flex;align-items:center;justify-content:center}
.net-graphic{position:relative;width:340px;height:340px;background:radial-gradient(240px 240px at 50% 50%,rgba(20,184,166,.12),transparent 75%);border-radius:50%}
.net-graphic .ng{position:absolute;font-weight:700;font-size:15px;padding:10px 18px;border-radius:999px;border:1px solid;box-shadow:var(--shadow);transition:.3s}
.net-graphic .ng:hover{transform:scale(1.12)}
.ng-c{top:50%;left:50%;transform:translate(-50%,-50%);background:linear-gradient(135deg,#2dd4bf,#0d9488);color:#fff;font-size:19px;border:0;z-index:2}
.ng-1{top:14%;left:50%;transform:translateX(-50%);background:#fff;color:#059669;border-color:#6ee7b7}
.ng-2{top:38%;right:0;background:#fff;color:#4f46e5;border-color:#a5b4fc}
.ng-3{bottom:12%;left:18%;background:#fff;color:#b45309;border-color:#fcd34d}
.ng-4{top:42%;left:0;background:#fff;color:#be123c;border-color:#fda4af}
.ng-5{bottom:16%;right:10%;background:#fff;color:#0369a1;border-color:#7dd3fc}

/* ============ Footer ============ */
.site-footer{background:var(--navy);color:#8ea3c8;padding:56px 0 40px}
.footer-inner{display:flex;flex-wrap:wrap;gap:30px;align-items:flex-start;justify-content:space-between}
.footer-brand .brand-text{color:#fff}
.footer-brand p{margin-top:10px;font-size:13.5px}
.footer-links{display:flex;gap:22px;flex-wrap:wrap}
.footer-links a{color:#aebbd8;text-decoration:none;font-size:14px}
.footer-links a:hover{color:#fff}
.footer-copy{width:100%;border-top:1px solid rgba(255,255,255,.1);padding-top:24px;margin-top:10px;font-size:12.5px;text-align:center;color:#64748b}

/* ============ 响应式 ============ */
@media (max-width:920px){
  .demo-wrap{grid-template-columns:1fr}
  .demo-canvas{min-height:440px}
  #netSvg{min-height:440px}
  .about-wrap{grid-template-columns:1fr;gap:36px}
}
@media (max-width:760px){
  .nav-links{position:fixed;inset:64px 0 auto 0;background:rgba(10,18,38,.98);flex-direction:column;gap:0;padding:10px 0 24px;display:none;border-bottom:1px solid rgba(255,255,255,.1)}
  .nav-links.open{display:flex}
  .nav-links a{padding:13px 24px;width:100%;text-align:center}
  .nav-links .nav-cta{margin:12px auto 0;width:fit-content}
  .nav-toggle{display:flex}
  .section{padding:72px 0}
  .hero-inner{padding:110px 0 70px}
}

/* 节点浮现动画 */
.net-node{opacity:0;transition:opacity .45s ease}
.net-node.in{opacity:1}

/* ============ 方法区：8 大模块配色 ============ */
.dim-card[data-cat="anton"]{--cat:#8b5cf6}
.dim-card[data-cat="obscure"]{--cat:#f97316}
.dim-card[data-cat="similar"]{--cat:#ec4899}
.dim-card[data-cat="exam"]{--cat:#0ea5e9}

/* ============ 复习抽测 ============ */
.review-strip{margin-top:22px;background:linear-gradient(120deg,#eff6ff,#f5f3ff);border:1px solid #c7d2fe;border-radius:var(--radius);padding:26px 28px}
.review-head{display:flex;align-items:center;gap:12px;margin-bottom:14px}
.review-head h3{font-size:18px}
.review-list{list-style:none;display:grid;grid-template-columns:repeat(auto-fit,minmax(220px,1fr));gap:10px 18px;margin-bottom:12px}
.review-list li{font-size:14.5px;color:#3730a3;background:rgba(255,255,255,.7);border:1px solid #e0e7ff;border-radius:10px;padding:9px 14px}
.review-list li b{color:#4338ca}
.review-note{font-size:13.5px;color:#6366f1}
.review-note b{color:#4338ca}

/* ============ AI 教学指令 ============ */
.ai-panel{background:var(--card);border:1px solid var(--line);border-radius:22px;box-shadow:var(--shadow);padding:36px;margin-bottom:22px}
.ai-intro{background:linear-gradient(120deg,#f0fdfa,#eff6ff);border:1px solid #99f6e4;border-radius:14px;padding:18px 22px;margin-bottom:26px}
.ai-intro p{font-size:15px;color:#134e4a;font-weight:500}
.ai-block-title{font-size:18px;font-weight:800;margin:26px 0 14px;padding-left:12px;border-left:4px solid var(--teal);line-height:1.4}
.ai-modules{display:grid;grid-template-columns:repeat(auto-fit,minmax(320px,1fr));gap:16px}
.ai-module{background:#f8fafc;border:1px solid var(--line);border-radius:14px;padding:18px 20px;transition:.25s}
.ai-module:hover{transform:translateY(-3px);box-shadow:var(--shadow);border-color:#99f6e4}
.ai-module h4{font-size:15.5px;margin-bottom:8px;color:var(--ink)}
.ai-module p{font-size:13.8px;color:var(--ink-soft)}
.ai-ex{display:block;margin-top:10px;font-size:12.8px;color:#0d9488;background:#f0fdfa;border-radius:8px;padding:7px 11px;line-height:1.6}
.ai-list{display:grid;grid-template-columns:repeat(auto-fit,minmax(280px,1fr));gap:10px;list-style:none}
.ai-subline{font-size:14.5px;color:var(--ink-soft);margin-bottom:10px}
.ai-list li{font-size:14px;color:var(--ink-soft);background:#f8fafc;border:1px solid var(--line);border-radius:10px;padding:10px 14px}
.ai-taboos li{color:#b91c1c;background:#fef2f2;border-color:#fecaca}
.ai-copy-bar{display:flex;align-items:center;justify-content:space-between;gap:18px;flex-wrap:wrap;background:linear-gradient(120deg,var(--navy),#14264a);border-radius:18px;padding:24px 28px;margin-bottom:18px}
.ai-copy-title{color:#fff;font-weight:700;font-size:17px}
.ai-copy-sub{color:#8ea3c8;font-size:13.5px;margin-top:3px}
.copy-btn{background:linear-gradient(135deg,#2dd4bf,#0d9488);color:#052e2a;border:0;border-radius:999px;padding:13px 28px;font-weight:700;font-size:15px;cursor:pointer;transition:.25s;font-family:var(--font);box-shadow:0 8px 20px rgba(20,184,166,.35)}
.copy-btn:hover{transform:translateY(-2px);box-shadow:0 12px 26px rgba(20,184,166,.45)}
.copy-btn.copied{background:linear-gradient(135deg,#34d399,#059669);color:#fff}
.ai-raw{background:var(--card);border:1px solid var(--line);border-radius:14px;overflow:hidden}
.ai-raw summary{cursor:pointer;padding:14px 20px;font-size:14px;font-weight:600;color:var(--ink-soft);user-select:none}
.ai-raw summary:hover{color:var(--teal-2)}
.ai-raw pre{background:#0f172a;color:#dbe6f5;padding:20px;font-size:13px;line-height:1.75;white-space:pre-wrap;word-break:break-word;max-height:520px;overflow:auto;border-radius:0 0 14px 14px;font-family:"SF Mono",Menlo,Consolas,monospace}

/* ============ 详情卡：真题例句 ============ */
.tip-example{margin-top:12px;font-size:12.8px;color:#bae6fd;background:rgba(14,165,233,.12);border:1px solid rgba(14,165,233,.3);border-radius:10px;padding:9px 12px;line-height:1.7}

/* ============ 关于区：新图 ============ */
.ng-6{top:60%;left:-4%}
.ng-4{font-size:13.5px}
.ng-1,.ng-2,.ng-3,.ng-5,.ng-6{font-size:13.5px}

/* 图例提示（动态生成）样式微调 */
.demo-hint span{border:1px solid transparent}

/* 词性徽标 */
.demo-pos{display:inline-block;font-size:12px;color:#5eead4;background:rgba(94,234,212,.12);border:1px solid rgba(94,234,212,.3);border-radius:999px;padding:2px 10px;margin-bottom:6px}
.tip-pos{display:inline-block;font-size:11.5px;color:#fbbf24;background:rgba(251,191,36,.12);border:1px solid rgba(251,191,36,.3);border-radius:999px;padding:1px 8px;margin-bottom:6px}
.demo-link .lw-pos{font-style:normal;font-size:11px;color:#8ea3c8;margin-left:4px}

/* ============ 图谱入口 ============ */
.graph-strip{margin-top:46px;background:linear-gradient(150deg,#0e1a33,#14264a);border:1px solid rgba(255,255,255,.1);border-radius:20px;padding:26px 28px;color:#fff}
.graph-strip-head{display:flex;align-items:center;justify-content:space-between;gap:16px;flex-wrap:wrap;margin-bottom:18px}
.graph-strip-head h3{font-size:18px}
.graph-strip-head p{font-size:13px;color:#8ea3c8;margin-top:3px}
.btn-sm{padding:9px 18px;font-size:13.5px}
.graph-thumbs{display:grid;grid-template-columns:repeat(auto-fit,minmax(180px,1fr));gap:14px}
.graph-thumbs a{position:relative;display:block;border-radius:12px;overflow:hidden;border:1px solid rgba(255,255,255,.14);transition:.25s;background:#0b1226}
.graph-thumbs a:hover{transform:translateY(-3px);border-color:#5eead4;box-shadow:0 12px 28px rgba(0,0,0,.45)}
.graph-thumbs img{display:block;width:100%;height:150px;object-fit:cover;object-position:left center}
.graph-thumbs span{position:absolute;left:10px;bottom:8px;font-size:12.5px;font-weight:700;color:#fff;background:rgba(0,0,0,.55);border-radius:6px;padding:2px 9px;backdrop-filter:blur(4px)}

/* ============ 万能查词 ============ */
.uni-bar{background:linear-gradient(150deg,rgba(20,184,166,.14),rgba(99,102,241,.12));border:1px solid rgba(94,234,212,.3);border-radius:18px;padding:20px 22px;margin-bottom:22px}
.uni-input-wrap{display:flex;gap:10px;flex-wrap:wrap}
.uni-input-wrap input{flex:1;min-width:240px;background:rgba(5,10,25,.55);border:1px solid rgba(255,255,255,.18);border-radius:999px;color:#e6edf9;font-size:15px;padding:12px 20px;outline:none;font-family:var(--font)}
.uni-input-wrap input:focus{border-color:#5eead4;box-shadow:0 0 0 3px rgba(94,234,212,.18)}
.uni-input-wrap input::placeholder{color:#64748b}
.uni-actions{display:flex;align-items:center;gap:14px;margin-top:12px;flex-wrap:wrap}
.uni-status{font-size:13px;color:#5eead4}
.uni-status.err{color:#fda4af}
.uni-tip{margin-top:10px;font-size:12.5px;color:#8ea3c8}
.uni-tip b{color:#5eead4}

/* 义项拆分徽标 */
.demo-senses{display:flex;flex-wrap:wrap;gap:6px;justify-content:center;margin-top:10px}
.demo-senses .sen{font-size:11.5px;color:#fff;background:rgba(255,255,255,.08);border:1px solid rgba(255,255,255,.22);border-radius:999px;padding:3px 10px}
.demo-root{margin-top:9px;font-size:11.5px;color:#fcd34d;line-height:1.6;background:rgba(251,191,36,.1);border-radius:8px;padding:6px 10px;text-align:left}
.demo-badge{margin-top:9px;font-size:11px;color:#67e8f9;background:rgba(14,165,233,.14);border:1px solid rgba(14,165,233,.35);border-radius:999px;padding:3px 10px}

/* ============ 记忆模式流程 ============ */
.pattern-flow{background:var(--card);border:1px solid var(--line);border-radius:22px;box-shadow:var(--shadow);padding:40px 32px;margin-top:56px}
.flow-grid{display:flex;align-items:stretch;gap:12px;flex-wrap:wrap;justify-content:center}
.flow-card{flex:1;min-width:200px;max-width:250px;background:#f8fafc;border:1px solid var(--line);border-radius:16px;padding:22px 20px;position:relative;transition:.25s}
.flow-card:hover{transform:translateY(-4px);box-shadow:var(--shadow);border-color:#99f6e4}
.flow-num{width:40px;height:40px;border-radius:12px;background:linear-gradient(135deg,var(--teal),var(--indigo));color:#fff;font-weight:800;font-size:18px;display:flex;align-items:center;justify-content:center;margin-bottom:12px}
.flow-card h3{font-size:16.5px;margin-bottom:8px}
.flow-card p{font-size:13.5px;color:var(--ink-soft)}
.flow-card p b{color:var(--teal-2)}
.flow-arrow{align-self:center;font-size:26px;color:#94a3b8;font-weight:800}
.flow-note{margin-top:24px;text-align:center;font-size:13.5px;color:var(--ink-soft);background:#f0fdfa;border:1px solid #99f6e4;border-radius:999px;padding:10px 18px}
.flow-note b{color:var(--teal-2)}

/* ============ 例句模态框 ============ */
.ex-modal{position:fixed;inset:0;z-index:300;background:rgba(5,10,25,.72);backdrop-filter:blur(6px);-webkit-backdrop-filter:blur(6px);display:flex;align-items:center;justify-content:center;padding:20px;pointer-events:none}
.ex-modal[hidden]{display:none}
.ex-modal-box{pointer-events:auto;background:#0e1a33;border:1px solid rgba(255,255,255,.14);border-radius:20px;width:min(760px,100%);max-height:82vh;display:flex;flex-direction:column;box-shadow:0 30px 80px rgba(0,0,0,.55);overflow:hidden}
.ex-head{display:flex;align-items:flex-start;justify-content:space-between;gap:14px;padding:20px 24px 12px}
.ex-head h3{font-size:20px;color:#fff}
.ex-sub{font-size:12.5px;color:#8ea3c8;margin-top:4px}
.ex-close{background:rgba(255,255,255,.08);border:1px solid rgba(255,255,255,.16);color:#c3d0e8;width:34px;height:34px;border-radius:50%;font-size:20px;cursor:pointer;line-height:1;flex:none;transition:.2s}
.ex-close:hover{background:rgba(255,255,255,.18);color:#fff}
.ex-legend{padding:0 24px 12px;display:flex;gap:10px}
.src-badge{display:inline-flex;align-items:center;gap:5px;font-size:11.5px;font-weight:700;border-radius:999px;padding:3px 11px;flex:none}
.src-badge.zhen{color:#fda4af;background:rgba(244,63,94,.14);border:1px solid rgba(244,63,94,.4)}
.src-badge.mo{color:#7dd3fc;background:rgba(14,165,233,.14);border:1px solid rgba(14,165,233,.4)}
.ex-list{list-style:none;overflow-y:auto;padding:4px 24px 24px;display:flex;flex-direction:column;gap:12px}
.ex-list::-webkit-scrollbar{width:8px}
.ex-list::-webkit-scrollbar-thumb{background:rgba(255,255,255,.16);border-radius:4px}
.ex-item{display:flex;gap:12px;align-items:flex-start;background:rgba(255,255,255,.045);border:1px solid rgba(255,255,255,.1);border-radius:14px;padding:14px 16px}
.ex-item .src-badge{margin-top:2px}
.ex-body{min-width:0}
.ex-file{font-size:11.5px;color:#64748b;margin-bottom:4px}
.ex-text{font-size:14px;color:#dbe6f5;line-height:1.7}
.ex-loading,.ex-empty{color:#8ea3c8;font-size:14px;text-align:center;padding:40px 0}
.ex-tip-extra{margin-top:2px;font-size:11px;color:#64748b}

/* ============ 思维导图（中心词在左，分支向右） ============ */
.demo-canvas{overflow:auto}
.mm-host{position:relative}
.mm-wrap{position:relative}
.mm-lines{position:absolute;inset:0;pointer-events:none}
.mm-root{position:absolute;width:260px;border-radius:20px;padding:24px 22px;
  background:linear-gradient(150deg,#1fa8a0,#14607f);box-shadow:0 16px 40px rgba(31,168,160,.35),inset 0 1px 0 rgba(255,255,255,.25);
  text-align:center;z-index:2;cursor:default}
.mm-root .mm-word{font-size:42px;font-weight:800;color:#fff;line-height:1.15}
.mm-root .mm-pho{font-size:13px;color:rgba(255,255,255,.85);margin-top:6px;font-family:"SF Mono",Menlo,monospace}
.mm-root .mm-pos{display:inline-block;font-size:12px;font-weight:700;background:rgba(0,0,0,.25);color:#fff;border-radius:999px;padding:3px 12px;margin-top:10px}
.mm-root .mm-senses{display:flex;flex-wrap:wrap;gap:6px;justify-content:center;margin-top:10px}
.mm-root .mm-senses span{font-size:11.5px;color:#fff;background:rgba(0,0,0,.28);border:1px solid rgba(255,255,255,.25);border-radius:999px;padding:3px 10px}
.mm-root .mm-meaning{margin-top:10px;font-size:14px;line-height:1.6;color:rgba(255,255,255,.92)}
.mm-root .mm-roothint{margin-top:9px;font-size:11px;color:#fde68a;background:rgba(0,0,0,.25);border-radius:8px;padding:6px 9px;line-height:1.5}
.mm-cat{position:absolute;width:440px;padding-left:34px;z-index:1}
.mm-cat-head{display:flex;align-items:center;gap:8px;font-size:15px;font-weight:800;color:#fff;
  border:1.5px solid;border-radius:999px;padding:8px 16px;width:fit-content;background:rgba(255,255,255,.05)}
.mm-cat-head .mm-cnt{margin-left:2px;font-size:12px;font-weight:600;opacity:.75}
.mm-cards{margin-top:12px;display:flex;flex-direction:column;gap:12px}
.mm-card{background:rgba(255,255,255,.055);border:1px solid rgba(255,255,255,.13);border-left:4px solid var(--cc,#14b8a6);
  border-radius:12px;padding:11px 14px;cursor:pointer;transition:.2s;box-shadow:0 6px 18px rgba(0,0,0,.22)}
.mm-card:hover{transform:translateX(4px);background:rgba(255,255,255,.1);border-color:var(--cc,#14b8a6)}
.mm-card .mm-l1{display:flex;align-items:baseline;gap:8px;flex-wrap:wrap}
.mm-card .mm-w{font-size:16px;font-weight:800;color:#fff}
.mm-card .mm-p{font-size:11.5px;color:#7dd3fc;font-family:"SF Mono",Menlo,monospace}
.mm-card .mm-po{font-size:10.5px;font-weight:700;color:#fcd34d;background:rgba(251,191,36,.14);border:1px solid rgba(251,191,36,.35);border-radius:999px;padding:1px 7px}
.mm-card .mm-hub{font-size:11px;color:#fbbf24;font-weight:800}
.mm-card .mm-m{margin-top:3px;font-size:13px;color:#c6d2e8;line-height:1.5}
.zh{font-style:normal;font-size:11.5px;color:#7ee0c8;display:block;margin-top:2px;line-height:1.5;word-break:break-word}
.demo-senses .zh,.mm-root .mm-senses .zh,.mm-root .mm-meaning .zh{display:inline;margin:0 0 0 4px;font-size:11px;color:#8fdcc7}
.tip-meaning .zh{display:block;margin-top:2px;font-size:12px;color:#7ee0c8}
.mm-card .mm-e{margin-top:5px;font-size:11.5px;color:var(--cc,#14b8a6);font-weight:600;line-height:1.45}

/* ============ 分众入口 ============ */
:root{--accent:#2dd4bf;--accent2:#0d9488;--accent3:#818cf8}
.hero-title .grad{background:linear-gradient(120deg,var(--accent),var(--accent3),#fbbf24);-webkit-background-clip:text;background-clip:text;-webkit-text-fill-color:transparent}
.btn-primary{background:linear-gradient(135deg,var(--accent),var(--accent2))}
.brand-mark{background:linear-gradient(135deg,var(--accent),var(--accent3))}
.stat b{background:linear-gradient(120deg,var(--accent),var(--accent3));-webkit-background-clip:text;background-clip:text;-webkit-text-fill-color:transparent}
.hero-eyebrow{color:var(--accent);border-color:color-mix(in srgb,var(--accent) 45%,transparent)}

/* 入口切换器 */
.tier-switch{display:flex;gap:4px;background:rgba(255,255,255,.07);border:1px solid rgba(255,255,255,.12);border-radius:999px;padding:4px;margin:0 4px}
.tier-switch a{color:#c3d0e8;text-decoration:none;font-size:12.5px;font-weight:600;padding:6px 13px;border-radius:999px;transition:.2s;white-space:nowrap}
.tier-switch a:hover{color:#fff;background:rgba(255,255,255,.08)}
.tier-switch a.active{background:linear-gradient(135deg,var(--accent),var(--accent2));color:#fff}

/* Hero 范围行 */
.hero-scope{margin-bottom:30px;display:inline-block;font-size:13.5px;color:#8ea3c8;background:rgba(255,255,255,.06);border:1px solid rgba(255,255,255,.14);border-radius:999px;padding:8px 18px}

/* 移动端导航：入口切换器换行 */
@media (max-width:760px){
  .tier-switch{margin:10px auto 0;width:fit-content}
}

/* ============ 入口选择页（landing） ============ */
.landing .hero{min-height:100vh}
.landing-inner{padding:110px 0 80px}
.tier-cards{display:grid;grid-template-columns:repeat(auto-fit,minmax(300px,1fr));gap:22px;margin:44px 0 36px;max-width:1080px}
.tier-card{display:block;background:rgba(255,255,255,.045);border:1px solid rgba(255,255,255,.12);border-radius:22px;padding:28px;text-decoration:none;color:#e6edf9;transition:.3s;position:relative;overflow:hidden}
.tier-card::before{content:"";position:absolute;inset:0 0 auto 0;height:5px;background:linear-gradient(90deg,var(--tc),var(--tc2))}
.tier-card:hover{transform:translateY(-6px);border-color:var(--tc);box-shadow:0 20px 50px rgba(0,0,0,.45)}
.tier-ico{font-size:36px;margin-bottom:14px}
.tier-card h2{font-size:22px;font-weight:800;color:#fff;display:inline-block;margin-right:10px}
.tier-tag{display:inline-block;font-size:11.5px;font-weight:700;color:var(--tc);background:color-mix(in srgb,var(--tc) 16%,transparent);border:1px solid color-mix(in srgb,var(--tc) 45%,transparent);border-radius:999px;padding:3px 11px;vertical-align:4px}
.tier-card p{margin-top:10px;font-size:14px;color:#aebbd8}
.tier-card ul{list-style:none;margin:16px 0 20px;display:flex;flex-direction:column;gap:8px}
.tier-card li{font-size:13px;color:#8ea3c8;padding-left:18px;position:relative}
.tier-card li::before{content:"✔";position:absolute;left:0;color:var(--tc)}
.tier-enter{display:inline-block;font-size:14px;font-weight:700;color:var(--tc);border:1px solid color-mix(in srgb,var(--tc) 50%,transparent);border-radius:999px;padding:9px 20px;transition:.25s}
.tier-card:hover .tier-enter{background:var(--tc);color:#0a1224}
.landing-links{display:flex;gap:14px;flex-wrap:wrap}

/* ============ 词表归属标注 ============ */
.tip-scope{margin-top:10px;display:flex;flex-wrap:wrap;gap:6px;align-items:center;text-align:left}
.ex-scope{padding:0 24px 10px;display:flex;flex-wrap:wrap;gap:6px;align-items:center}
.scope-label{font-size:11.5px;color:#8ea3c8;margin-right:2px;flex:none}
.scope-chip{font-size:11px;font-weight:700;border-radius:999px;padding:3px 10px;border:1px solid rgba(255,255,255,.2);color:#64748b;background:rgba(255,255,255,.03)}
.scope-chip.on[data-k="gk"]{color:#fda4af;background:rgba(244,63,94,.14);border-color:rgba(244,63,94,.45)}
.scope-chip.on[data-k="c4"]{color:#7dd3fc;background:rgba(14,165,233,.14);border-color:rgba(56,189,248,.45)}
.scope-chip.on[data-k="c6"]{color:#c4b5fd;background:rgba(139,92,246,.15);border-color:rgba(139,92,246,.45)}
.scope-chip.on[data-k="il"]{color:#fcd34d;background:rgba(251,191,36,.14);border-color:rgba(251,191,36,.45)}

.scope-chip.on[data-k="ky"]{color:#fdba74;background:rgba(251,146,60,.15);border-color:rgba(251,146,60,.5)}

/* ============ 移动端适配（手机优先） ============ */
@media (max-width:768px){
  .container{padding:0 18px}
  .hero-inner{padding:96px 0 60px}
  .hero-eyebrow{font-size:12px}
  .hero-title{font-size:28px;line-height:1.25}
  .hero-sub{font-size:14px}
  .hero-actions{flex-direction:column;align-items:stretch}
  .hero-actions .btn{text-align:center}
  .hero-stats{gap:10px}
  .stat b{font-size:22px}
  .section{padding:54px 0}
  .section-head h2{font-size:22px}
  .section-desc{font-size:14px}
  .tier-cards{grid-template-columns:1fr}
  .tier-card{padding:24px 20px}
  .dim-grid{grid-template-columns:1fr 1fr;gap:12px}
  .dim-card{padding:18px 14px}
  .method-idea{flex-direction:column}
  .idea-word{font-size:20px;padding:10px 14px}
  .idea-bridge{transform:rotate(90deg)}
  .demo-wrap{grid-template-columns:1fr;padding:0}
  .demo-canvas{min-height:auto}
  /* 词网思维导图：纵向布局（手机） */
  .mm-wrap{width:100% !important;height:auto !important}
  .mm-root{position:static !important;top:auto !important;left:auto !important;width:100% !important;margin:0 0 14px;padding:18px 14px}
  .mm-root .mm-word{font-size:30px}
  .mm-cat{position:static !important;top:auto !important;left:auto !important;width:100% !important;padding-left:0 !important;margin-bottom:20px}
  .mm-lines{display:none !important}
  .mm-card:hover{transform:none}
  .mm-card{font-size:13px}
  .mm-cat-head{font-size:14px}
  .mm-cards{gap:9px}
  .demo-links li{padding:9px 12px;font-size:13px}
  .lw-pos{font-size:10px}
}
@media (max-width:480px){
  .dim-grid{grid-template-columns:1fr}
  .hero-stats{flex-wrap:wrap;justify-content:center}
  .tier-tag{font-size:10px}
  .tier-enter{font-size:13px;padding:8px 16px}
  .landing-links .btn{width:100%;text-align:center}
}