/* ========== 基础重置与设计变量 ========== */
:root{
  --bg:#0B1420;            /* 石墨深蓝：页面底色 */
  --bg-2:#0E1A2B;          /* 面板深一档 */
  --bg-3:#14233A;          /* 卡片底色 */
  --line:rgba(147,164,188,.14);   /* 细分割线 */
  --line-strong:rgba(42,245,200,.45);
  --cyan:#2AF5C8;          /* 荧光青：数据上升 / 亮点 */
  --cyan-deep:#14C9A2;
  --orange:#FF8A3C;        /* 荧光橙：CTA / 强调 */
  --indigo:#4D8DFF;        /* 靛蓝：辅助 */
  --amber:#FFD166;         /* 警示黄：数据高亮 */
  --text:#EAF1FB;          /* 主文字 */
  --text-2:#A9B8CE;        /* 次级文字 */
  --text-3:#68788F;        /* 弱化文字 */
  --font-sans:"PingFang SC","Microsoft YaHei","Noto Sans SC","Source Han Sans SC",sans-serif;
  --font-mono:"JetBrains Mono","Cascadia Mono","Consolas","DIN Alternate",monospace;
  --radius:16px;
  --shadow:0 24px 60px rgba(0,0,0,.5);
  --shadow-glow:0 0 40px rgba(42,245,200,.12);
}
*{margin:0;padding:0;box-sizing:border-box}
html{scroll-behavior:smooth}
body{
  background:var(--bg);
  color:var(--text);
  font-family:var(--font-sans);
  line-height:1.75;
  overflow-x:hidden;
  -webkit-font-smoothing:antialiased;
}
::selection{background:rgba(42,245,200,.3);color:#fff}
a{color:inherit;text-decoration:none}
img{max-width:100%;display:block}
ul,ol{list-style:none}
button{font-family:inherit;cursor:pointer;border:none;background:none;color:inherit}

/* 滚动条 */
::-webkit-scrollbar{width:10px}
::-webkit-scrollbar-track{background:var(--bg)}
::-webkit-scrollbar-thumb{background:#1E2C44;border-radius:8px}
::-webkit-scrollbar-thumb:hover{background:var(--cyan-deep)}

/* ========== 背景纹理层 ========== */
.bg-fx{position:fixed;inset:0;z-index:0;pointer-events:none;overflow:hidden}
.bg-fx .grid-line{
  position:absolute;inset:0;
  background-image:
    linear-gradient(rgba(147,164,188,.05) 1px,transparent 1px),
    linear-gradient(90deg,rgba(147,164,188,.05) 1px,transparent 1px);
  background-size:52px 52px;
  mask-image:radial-gradient(ellipse 90% 70% at 50% 0%,#000 30%,transparent 75%);
  -webkit-mask-image:radial-gradient(ellipse 90% 70% at 50% 0%,#000 30%,transparent 75%);
}
.bg-fx .glow-1{
  position:absolute;top:-220px;right:-160px;width:880px;height:560px;border-radius:50%;
  background:radial-gradient(closest-side,rgba(42,245,200,.09),transparent);
  filter:blur(40px);
}
.bg-fx .glow-2{
  position:absolute;bottom:-240px;left:-160px;width:760px;height:620px;border-radius:50%;
  background:radial-gradient(closest-side,rgba(77,141,255,.09),transparent);
  filter:blur(50px);
}
.bg-fx .scanline{
  position:absolute;top:0;left:0;right:0;height:120px;
  background:linear-gradient(180deg,rgba(42,245,200,.05),transparent);
  animation:scan 8s linear infinite;
}
@keyframes scan{0%{transform:translateY(-120px)}100%{transform:translateY(110vh)}}

/* ========== 通用容器与区块 ========== */
.container{position:relative;z-index:1;max-width:1200px;margin:0 auto;padding:0 28px}
section{position:relative;z-index:1}
.sec-pad{padding:110px 0}
.sec-head{max-width:760px;margin:0 auto 62px;text-align:center}
.sec-eyebrow{
  display:inline-flex;align-items:center;gap:8px;
  font-family:var(--font-mono);font-size:12px;letter-spacing:4px;color:var(--cyan);
  padding:8px 18px;border:1px solid var(--line-strong);border-radius:6px;
  background:rgba(42,245,200,.06);margin-bottom:22px;text-transform:uppercase;
}
.sec-eyebrow::before{content:"";width:6px;height:6px;background:var(--cyan);box-shadow:0 0 10px var(--cyan)}
.sec-title{
  font-family:var(--font-sans);font-weight:800;font-size:clamp(30px,4vw,44px);
  line-height:1.3;letter-spacing:1px;
}
.sec-title .grad{background:linear-gradient(120deg,var(--cyan),#6FFFE0 55%,var(--orange));-webkit-background-clip:text;background-clip:text;-webkit-text-fill-color:transparent}
.sec-sub{color:var(--text-2);font-size:15.5px;margin-top:18px}
.sec-sub .sub-hl{color:var(--cyan);font-style:normal;font-family:var(--font-mono);font-weight:700}

/* ========== 顶部导航 ========== */
.nav{
  position:fixed;top:0;left:0;right:0;z-index:100;
  transition:all .35s ease;padding:16px 0;
}
.nav.scrolled{
  background:rgba(11,20,32,.88);
  backdrop-filter:blur(18px);-webkit-backdrop-filter:blur(18px);
  border-bottom:1px solid var(--line);padding:9px 0;
}
.nav .container{display:flex;align-items:center;justify-content:space-between}
.logo{display:flex;align-items:center;gap:10px}
.logo .mark{
  width:40px;height:40px;border-radius:10px;display:grid;place-items:center;
  background:linear-gradient(135deg,var(--cyan),var(--cyan-deep));color:#04120C;
  box-shadow:0 0 22px rgba(42,245,200,.4);flex-shrink:0;
  font-family:var(--font-mono);font-weight:700;font-size:14px;letter-spacing:.5px;
}
.logo b{
  font-family:var(--font-sans);font-size:19px;letter-spacing:1px;font-weight:800;
  background:linear-gradient(90deg,var(--cyan) 0%,#8FF5DE 45%,var(--orange) 100%);
  -webkit-background-clip:text;background-clip:text;-webkit-text-fill-color:transparent;color:transparent;
  filter:drop-shadow(0 0 10px rgba(42,245,200,.35));
}
.logo span{display:block;font-size:10.5px;color:var(--text-3);letter-spacing:2px;margin-top:-2px;font-family:var(--font-mono)}
.nav-links{display:flex;align-items:center;gap:4px}
.nav-links a{
  padding:8px 13px;font-size:14.5px;color:var(--text-2);border-radius:8px;transition:all .25s;
}
.nav-links a:hover{color:var(--cyan);background:rgba(42,245,200,.07)}
.nav-links a.nav-cta{
  margin-left:12px;padding:10px 22px;font-size:14px;font-weight:700;color:#1A0E05;
  background:linear-gradient(120deg,var(--orange),#FFB27C);
  border-radius:10px;box-shadow:0 6px 22px rgba(255,138,60,.35);
  transition:all .25s;white-space:nowrap;
}
.nav-links a.nav-cta:hover{transform:translateY(-2px);box-shadow:0 10px 28px rgba(255,138,60,.5);background:linear-gradient(120deg,#FF7A1F,#FF9A55)}
.burger{display:none;width:42px;height:42px;border-radius:10px;border:1px solid var(--line);place-items:center}
.burger span{display:block;width:18px;height:2px;background:var(--text);margin:2.5px auto;transition:all .3s;border-radius:2px}
.burger.active span:nth-child(1){transform:translateY(7px) rotate(45deg)}
.burger.active span:nth-child(2){opacity:0}
.burger.active span:nth-child(3){transform:translateY(-7px) rotate(-45deg)}

/* ========== Hero ========== */
.hero{
  min-height:100vh;display:flex;align-items:center;
  padding:140px 0 90px;position:relative;overflow:hidden;
}
.hero .container{display:grid;grid-template-columns:1.05fr .95fr;gap:56px;align-items:center}
.hero-badge{
  display:inline-flex;align-items:center;gap:10px;padding:9px 20px;
  border:1px solid var(--line-strong);border-radius:6px;background:rgba(42,245,200,.07);
  font-family:var(--font-mono);font-size:12px;letter-spacing:2px;color:var(--cyan);margin-bottom:26px;
}
.hero-badge .dot{width:8px;height:8px;border-radius:50%;background:var(--cyan);animation:pulse 1.6s infinite}
@keyframes pulse{0%,100%{box-shadow:0 0 0 0 rgba(42,245,200,.5)}50%{box-shadow:0 0 0 8px rgba(42,245,200,0)}}
.hero h1{
  font-family:var(--font-sans);font-weight:900;
  font-size:clamp(38px,5vw,58px);line-height:1.22;letter-spacing:1px;
}
.hero h1 .grad{background:linear-gradient(120deg,#6FFFE0,var(--cyan) 45%,var(--orange));-webkit-background-clip:text;background-clip:text;-webkit-text-fill-color:transparent}
.hero .type-wrap{height:38px;margin-top:20px;font-size:clamp(16px,1.7vw,20px);color:var(--text-2);font-family:var(--font-mono);letter-spacing:.5px}
.hero .type-wrap .cursor{display:inline-block;width:2px;height:1.1em;background:var(--cyan);margin-left:3px;vertical-align:-2px;animation:blink 1s steps(1) infinite}
@keyframes blink{50%{opacity:0}}
.hero-feats{display:flex;flex-wrap:wrap;gap:12px;margin:30px 0 36px}
.hero-feats li{
  display:flex;align-items:center;gap:8px;padding:9px 15px;
  border:1px solid var(--line);border-radius:8px;background:rgba(20,35,58,.5);
  font-size:13.5px;color:var(--text-2);
}
.hero-feats li svg{width:16px;height:16px;color:var(--cyan);flex-shrink:0}
.hero-btns{display:flex;gap:16px;flex-wrap:wrap}
.btn{
  display:inline-flex;align-items:center;gap:10px;padding:15px 32px;
  border-radius:12px;font-size:15.5px;font-weight:700;transition:all .3s;position:relative;overflow:hidden;
}
.btn-primary{
  background:linear-gradient(120deg,var(--orange),#FF9A55);color:#1A0E05;
  box-shadow:0 8px 26px rgba(255,138,60,.35);
}
.btn-primary:hover{transform:translateY(-3px);box-shadow:0 14px 36px rgba(255,138,60,.5)}
.btn-primary::after{
  content:"";position:absolute;top:0;left:-80%;width:50%;height:100%;
  background:linear-gradient(100deg,transparent,rgba(255,255,255,.4),transparent);
  transform:skewX(-20deg);transition:left .6s;
}
.btn-primary:hover::after{left:130%}
.btn-ghost{
  border:1px solid var(--line-strong);color:var(--cyan);background:rgba(42,245,200,.05);
}
.btn-ghost:hover{background:rgba(42,245,200,.14);transform:translateY(-3px)}
.hero-stats{display:flex;gap:38px;margin-top:48px;padding-top:26px;border-top:1px solid var(--line)}
.hero-stats .num{font-family:var(--font-mono);font-size:28px;font-weight:700;color:#fff;line-height:1.1}
.hero-stats .num em{color:var(--cyan);font-style:normal}
.hero-stats .lbl{font-size:12.5px;color:var(--text-3);margin-top:4px;font-family:var(--font-mono);letter-spacing:.5px}

/* Hero 右侧：实时监控仪表盘 */
.hero-visual{position:relative;display:grid;place-items:center}
.dash-card{
  width:min(480px,100%);background:var(--bg-2);border-radius:18px;
  border:1px solid var(--line);box-shadow:var(--shadow),var(--shadow-glow);
  overflow:hidden;animation:floatY 6s ease-in-out infinite;position:relative;
}
@keyframes floatY{0%,100%{transform:translateY(0)}50%{transform:translateY(-14px)}}
.dash-top{display:flex;align-items:center;justify-content:space-between;padding:14px 18px;border-bottom:1px solid var(--line);background:rgba(11,20,32,.6)}
.dash-top .t{font-family:var(--font-mono);font-size:12px;letter-spacing:2px;color:var(--text-2);display:flex;align-items:center;gap:8px}
.dash-top .t .live{width:7px;height:7px;border-radius:50%;background:var(--cyan);animation:pulse 1.4s infinite}
.dash-top .tag{font-family:var(--font-mono);font-size:10px;letter-spacing:1px;color:var(--cyan);border:1px solid var(--line-strong);padding:3px 10px;border-radius:4px}
.dash-main{padding:24px 22px 10px;display:flex;align-items:center;gap:22px}
.dash-ring{position:relative;width:118px;height:118px;flex-shrink:0}
.dash-ring svg{width:100%;height:100%;transform:rotate(-90deg)}
.dash-ring .track{fill:none;stroke:rgba(147,164,188,.15);stroke-width:9}
.dash-ring .bar{fill:none;stroke:url(#dashGrad);stroke-width:9;stroke-linecap:round;stroke-dasharray:345.6;stroke-dashoffset:345.6;transition:stroke-dashoffset 1.6s cubic-bezier(.25,.8,.25,1)}
.dash-ring .val{position:absolute;inset:0;text-align:center}
.dash-ring .val b{
  position:absolute;top:50%;left:50%;transform:translate(-50%,-50%);
  font-family:var(--font-mono);font-size:34px;font-weight:700;color:#fff;line-height:1;
}
.dash-ring .val b em{color:var(--cyan);font-style:normal}
.dash-ring .val span{
  position:absolute;top:50%;left:50%;transform:translate(-50%,-50%);
  margin-top:24px;font-size:10px;color:var(--text-3);letter-spacing:1px;
  font-family:var(--font-mono);white-space:nowrap;
}
.dash-info{flex:1}
.dash-info .row{display:flex;justify-content:space-between;align-items:center;padding:9px 0;border-bottom:1px dashed rgba(147,164,188,.15);font-size:13px}
.dash-info .row:last-child{border-bottom:none}
.dash-info .row .k{color:var(--text-3);font-family:var(--font-mono);font-size:11.5px;letter-spacing:.5px}
.dash-info .row .v{font-family:var(--font-mono);font-weight:700;color:var(--text)}
.dash-info .row .v.up{color:var(--cyan)}
.dash-info .row .v.hot{color:var(--amber)}
.dash-chart{height:120px;padding:0 22px 16px}
.dash-chart canvas{width:100%;height:100%;display:block}
.dash-engines{display:grid;grid-template-columns:repeat(3,1fr);gap:10px;padding:14px 22px 20px;border-top:1px solid var(--line)}
.dash-engines .en{
  text-align:center;padding:10px 8px;border-radius:10px;background:rgba(20,35,58,.6);
  border:1px solid var(--line);transition:all .3s;
}
.dash-engines .en:hover{border-color:var(--line-strong);transform:translateY(-3px)}
.dash-engines .en b{display:block;font-size:13px;font-weight:700}
.dash-engines .en span{font-family:var(--font-mono);font-size:10px;color:var(--text-3);letter-spacing:1px}
.dash-engines .en:nth-child(1) b{color:var(--indigo)}
.dash-engines .en:nth-child(2) b{color:var(--amber)}
.dash-engines .en:nth-child(3) b{color:var(--cyan)}
.dash-badge{
  position:absolute;top:-14px;right:-10px;padding:8px 16px;border-radius:8px;
  background:linear-gradient(120deg,var(--orange),#FF9A55);color:#1A0E05;
  font-size:12px;font-weight:800;letter-spacing:1px;font-family:var(--font-mono);
  box-shadow:0 10px 24px rgba(255,138,60,.35);animation:floatY 5s ease-in-out infinite .8s;z-index:2;
}
.scroll-hint{
  position:absolute;bottom:26px;left:50%;transform:translateX(-50%);
  display:flex;flex-direction:column;align-items:center;gap:8px;color:var(--text-3);font-size:11px;letter-spacing:3px;z-index:2;font-family:var(--font-mono);
}
.scroll-hint .line{width:1px;height:44px;background:linear-gradient(var(--cyan),transparent);animation:drop 1.8s infinite}
@keyframes drop{0%{transform:scaleY(0);transform-origin:top}50%{transform:scaleY(1);transform-origin:top}51%{transform-origin:bottom}100%{transform:scaleY(0);transform-origin:bottom}}

/* ========== 排名轨迹区 ========== */
.track-sec{background:linear-gradient(180deg,transparent,rgba(42,245,200,.025) 30%,transparent);overflow:hidden}
.track-wrap{position:relative;padding:20px 0}
.track-chart{
  position:relative;height:340px;margin-top:30px;
  display:flex;align-items:stretch;gap:22px;padding:46px 14px 0;
}
.track-col{flex:1;min-width:0;display:flex;flex-direction:column;align-items:center}
.track-bar{
  position:relative;width:100%;max-width:96px;flex:1;display:flex;align-items:flex-end;justify-content:center;
  background:repeating-linear-gradient(to top,rgba(147,164,188,.12) 0 1px,transparent 1px 60px);
  border-bottom:1px solid var(--line-strong);
}
.track-col .fill{
  width:100%;height:0;
  background:linear-gradient(180deg,var(--cyan),rgba(77,141,255,.38));
  border-radius:8px 8px 0 0;
  box-shadow:0 0 18px rgba(42,245,200,.28);
  transition:height 1.1s cubic-bezier(.25,.8,.25,1);
}
.track-col .num{
  position:absolute;top:-42px;left:50%;
  font-family:var(--font-mono);font-size:26px;font-weight:700;color:#fff;line-height:1;
  opacity:0;transform:translate(-50%,10px);
  transition:opacity .5s ease,transform .5s ease;
  white-space:nowrap;
}
.track-col.c1 .fill{transition-delay:.15s}
.track-col.c2 .fill{transition-delay:.3s}
.track-col.c3 .fill{transition-delay:.45s}
.track-col.c4 .fill{transition-delay:.6s}
.track-col.c5 .fill{transition-delay:.75s}
.track-col.c1 .num{transition-delay:.3s}
.track-col.c2 .num{transition-delay:.45s}
.track-col.c3 .num{transition-delay:.6s}
.track-col.c4 .num{transition-delay:.75s}
.track-col.c5 .num{transition-delay:.9s}
.track-wrap.in .track-col .fill{height:var(--h)}
.track-wrap.in .track-col .num{opacity:1;transform:translate(-50%,0)}
.track-col.hot .fill{
  background:linear-gradient(180deg,var(--orange),rgba(255,138,60,.38));
  box-shadow:0 0 24px rgba(255,138,60,.5);
}
.track-col.hot .num{color:var(--orange)}
.track-col .track-meta{margin-top:12px;text-align:center}
.track-col .day{display:block;font-family:var(--font-mono);font-size:13px;font-weight:700;color:var(--text);letter-spacing:.5px}
.track-col .tag2{
  display:inline-block;margin-top:5px;font-size:11px;padding:3px 10px;border-radius:4px;
  font-family:var(--font-mono);letter-spacing:.5px;border:1px solid var(--line);color:var(--text-3);
}
.track-col.hot .tag2{border-color:rgba(255,138,60,.5);color:var(--orange)}

/* ========== 引擎 Tab 切换 ========== */
.engine-sec{background:linear-gradient(180deg,transparent,rgba(77,141,255,.03) 30%,transparent)}
.tab-bar{display:flex;gap:10px;justify-content:center;margin-bottom:40px;flex-wrap:wrap}
.tab-btn{
  display:inline-flex;align-items:center;gap:10px;padding:13px 30px;border-radius:10px;
  border:1px solid var(--line);background:rgba(20,35,58,.5);color:var(--text-2);
  font-size:15px;font-weight:700;transition:all .3s;
}
.tab-btn .dot{width:9px;height:9px;border-radius:50%}
.tab-btn.active{border-color:var(--line-strong);background:rgba(42,245,200,.08);color:var(--cyan);box-shadow:var(--shadow-glow)}
.tab-panel{display:none}
.tab-panel.active{display:block;animation:tabIn .5s cubic-bezier(.25,.8,.25,1)}
@keyframes tabIn{from{opacity:0;transform:translateY(18px)}to{opacity:1;transform:none}}
.engine-card{
  display:grid;grid-template-columns:1.1fr .9fr;gap:44px;align-items:center;
  background:var(--bg-2);border:1px solid var(--line);border-radius:20px;padding:48px;
  box-shadow:var(--shadow);
}
.engine-head{display:flex;align-items:center;gap:16px;margin-bottom:20px}
.engine-head .badge{
  width:54px;height:54px;border-radius:14px;display:grid;place-items:center;color:#fff;
  font-family:var(--font-mono);font-weight:700;font-size:15px;letter-spacing:.5px;
}
.badge.bing{background:linear-gradient(135deg,#00A4EF,#005A9E);box-shadow:0 6px 18px rgba(0,164,239,.4)}
.badge.google{background:linear-gradient(135deg,#4285F4,#EA4335);box-shadow:0 6px 18px rgba(66,133,244,.4)}
.badge.baidu{background:linear-gradient(135deg,#2932E1,#1E1E1E);box-shadow:0 6px 18px rgba(41,50,225,.35)}
.engine-head h3{font-size:24px;font-weight:800}
.engine-head span{display:block;font-family:var(--font-mono);font-size:11px;color:var(--text-3);letter-spacing:2px}
.engine-desc{color:var(--text-2);font-size:14.5px;margin-bottom:22px}
.engine-factors{margin-bottom:26px}
.engine-factors h4{font-family:var(--font-mono);font-size:12px;letter-spacing:2px;color:var(--text-3);margin-bottom:14px}
.engine-factors .flist{display:flex;flex-wrap:wrap;gap:9px}
.engine-factors .flist span{
  display:inline-flex;align-items:center;gap:6px;padding:8px 15px;border-radius:6px;
  font-family:var(--font-mono);font-size:12px;letter-spacing:.5px;color:var(--cyan);
  border:1px solid var(--line-strong);background:rgba(42,245,200,.06);
}
.engine-factors .flist span::before{content:"";width:5px;height:5px;background:var(--cyan);border-radius:50%}
.engine-note{
  padding:16px 20px;border-radius:10px;border:1px solid rgba(255,209,102,.3);
  background:rgba(255,209,102,.05);font-size:13px;color:var(--amber);
}
.engine-visual{position:relative;background:rgba(11,20,32,.6);border:1px solid var(--line);border-radius:16px;padding:26px;min-height:300px}
.engine-visual .metric-bar{display:flex;align-items:center;gap:14px;margin-bottom:18px}
.engine-visual .metric-bar .k{width:110px;font-size:12.5px;color:var(--text-3);flex-shrink:0}
.engine-visual .metric-bar .bar{flex:1;height:8px;border-radius:6px;background:rgba(147,164,188,.15);overflow:hidden}
.engine-visual .metric-bar .bar i{display:block;height:100%;width:0;border-radius:6px;background:linear-gradient(90deg,var(--indigo),var(--cyan));transition:width 1.3s cubic-bezier(.25,.8,.25,1)}
.engine-visual .metric-bar .v{font-family:var(--font-mono);font-size:13px;font-weight:700;color:var(--cyan);width:56px;text-align:right}
.engine-visual .metric-bar .v.hot{color:var(--amber)}
.engine-visual .engine-cta{
  display:inline-flex;align-items:center;gap:8px;margin-top:14px;padding:11px 22px;border-radius:10px;
  background:linear-gradient(120deg,var(--orange),#FF9A55);color:#1A0E05;font-size:13.5px;font-weight:700;transition:all .3s;
}
.engine-visual .engine-cta:hover{transform:translateY(-2px);box-shadow:0 8px 22px rgba(255,138,60,.4)}

/* ========== 教学体系 ========== */
.course-grid{display:grid;grid-template-columns:1.15fr .85fr;gap:50px;align-items:start}
.course-modules{display:grid;grid-template-columns:1fr 1fr;gap:18px}
.course-module{
  position:relative;padding:26px;border-radius:16px;background:var(--bg-2);
  border:1px solid var(--line);transition:all .35s;overflow:hidden;
}
.course-module::before{
  content:"";position:absolute;top:0;left:0;right:0;height:3px;
  background:linear-gradient(90deg,var(--cyan),transparent);
  transform:scaleX(0);transform-origin:left;transition:transform .45s;
}
.course-module:hover{transform:translateY(-6px);border-color:var(--line-strong);box-shadow:var(--shadow-glow)}
.course-module:hover::before{transform:scaleX(1)}
.course-module .mhead{display:flex;align-items:center;justify-content:space-between;margin-bottom:14px}
.course-module .mid{font-family:var(--font-mono);font-size:20px;font-weight:700;color:var(--cyan)}
.course-module .mbar{width:34px;height:34px;border-radius:50%;display:grid;place-items:center;position:relative}
.course-module .mbar svg{width:100%;height:100%;transform:rotate(-90deg)}
.course-module .mbar .track{fill:none;stroke:rgba(147,164,188,.18);stroke-width:4}
.course-module .mbar .fill{fill:none;stroke:var(--cyan);stroke-width:4;stroke-linecap:round;stroke-dasharray:100.5;stroke-dashoffset:100.5;transition:stroke-dashoffset 1.4s .2s cubic-bezier(.25,.8,.25,1)}
.course-module .mbar span{position:absolute;font-family:var(--font-mono);font-size:9px;color:var(--text-2)}
.course-module h4{font-size:16.5px;font-weight:700;margin-bottom:6px}
.course-module h4 span{font-family:var(--font-mono);font-size:11px;letter-spacing:1px;color:var(--text-3);margin-right:6px}
.course-module p{font-size:13px;color:var(--text-2)}
.course-side{position:sticky;top:96px}
.course-side .course-card{
  padding:34px;border-radius:20px;background:linear-gradient(180deg,rgba(42,245,200,.07),var(--bg-2));
  border:1px solid var(--line-strong);box-shadow:var(--shadow);position:relative;overflow:hidden;
}
.course-side .course-card::after{
  content:"";position:absolute;top:-60px;right:-60px;width:180px;height:180px;border-radius:50%;
  background:radial-gradient(closest-side,rgba(42,245,200,.2),transparent);
}
.course-side h3{font-size:22px;font-weight:800;margin-bottom:6px;position:relative;z-index:1}
.course-side .sub{color:var(--text-3);font-size:13px;margin-bottom:20px;position:relative;z-index:1;font-family:var(--font-mono);letter-spacing:.5px}
.course-side ul{position:relative;z-index:1}
.course-side ul li{display:flex;gap:11px;padding:10px 0;font-size:14px;color:var(--text-2);align-items:center;border-bottom:1px dashed rgba(147,164,188,.15)}
.course-side ul li:last-child{border-bottom:none}
.course-side ul li svg{width:17px;height:17px;color:var(--cyan);flex-shrink:0}
.course-cta{margin-top:22px;position:relative;z-index:1}
.course-cta .btn-primary{box-shadow:0 10px 30px rgba(255,138,60,.4)}

/* ========== 方法论流程 ========== */
.method-sec{background:linear-gradient(180deg,transparent,rgba(255,138,60,.025) 30%,transparent)}
.methods{display:grid;grid-template-columns:repeat(5,1fr);gap:18px}
.method-card{
  position:relative;text-align:center;padding:28px 14px;border-radius:16px;
  background:var(--bg-2);border:1px solid var(--line);transition:all .35s;
}
.method-card::before{
  content:"";position:absolute;top:50%;right:-10px;width:20px;height:2px;background:var(--line-strong);
  transform:translateY(-50%);z-index:1;
}
.method-card:last-child::before{display:none}
.method-card:hover{transform:translateY(-6px);border-color:rgba(255,138,60,.45);box-shadow:0 10px 30px rgba(255,138,60,.12)}
.method-num{
  width:64px;height:64px;margin:0 auto 16px;border-radius:14px;display:grid;place-items:center;position:relative;
  background:linear-gradient(135deg,rgba(255,138,60,.16),rgba(255,138,60,.04));
  border:1px solid rgba(255,138,60,.4);font-family:var(--font-mono);font-size:22px;font-weight:700;color:var(--orange);
}
.method-card h3{font-size:15.5px;font-weight:700;margin-bottom:6px}
.method-card p{font-size:12px;color:var(--text-3)}

/* ========== 数据看板 ========== */
.data-sec{position:relative;overflow:hidden}
.data-sec::before{
  content:"";position:absolute;inset:0;
  background:radial-gradient(ellipse 70% 60% at 50% 50%,rgba(42,245,200,.05),transparent 70%);
}
.data-grid{display:grid;grid-template-columns:repeat(4,1fr);gap:22px}
.data-card{
  text-align:center;padding:38px 20px;border-radius:16px;
  background:var(--bg-2);border:1px solid var(--line);transition:all .35s;position:relative;overflow:hidden;
}
.data-card::after{
  content:"";position:absolute;bottom:0;left:0;right:0;height:3px;
  background:linear-gradient(90deg,var(--cyan),var(--orange));transform:scaleX(0);transform-origin:left;transition:transform .5s;
}
.data-card:hover{transform:translateY(-6px);border-color:var(--line-strong);box-shadow:var(--shadow-glow)}
.data-card:hover::after{transform:scaleX(1)}
.data-ring{position:relative;width:104px;height:104px;margin:0 auto 16px}
.data-ring svg{width:100%;height:100%;transform:rotate(-90deg)}
.data-ring .track{fill:none;stroke:rgba(147,164,188,.15);stroke-width:8}
.data-ring .bar{fill:none;stroke:url(#ringGrad);stroke-width:8;stroke-linecap:round;stroke-dasharray:301.6;stroke-dashoffset:301.6;transition:stroke-dashoffset 1.6s cubic-bezier(.25,.8,.25,1)}
.data-ring .val{position:absolute;inset:0;display:grid;place-items:center}
.data-ring .val b{font-family:var(--font-mono);font-size:26px;font-weight:700;color:#fff}
.data-ring .val b em{color:var(--cyan);font-style:normal}
.data-card .lbl{color:var(--text-2);font-size:13.5px;margin-top:8px}
.data-card .bar2{height:5px;border-radius:5px;background:rgba(147,164,188,.15);margin-top:14px;overflow:hidden}
.data-card .bar2 i{display:block;height:100%;width:0;background:linear-gradient(90deg,var(--cyan),#6FFFE0);transition:width 1.4s cubic-bezier(.25,.8,.25,1)}

/* ========== 案例展示 ========== */
.case-sec{background:linear-gradient(180deg,transparent,rgba(255,138,60,.025) 30%,transparent)}
.case-grid{display:grid;grid-template-columns:repeat(3,1fr);gap:22px;margin-top:42px}
.case-card{
  display:flex;flex-direction:column;gap:14px;
  background:rgba(147,164,188,.05);border:1px solid var(--line);border-radius:14px;padding:20px;
  transition:transform .3s ease,border-color .3s ease,box-shadow .3s ease;
}
.case-card:hover{transform:translateY(-5px);border-color:rgba(42,245,200,.35);box-shadow:0 18px 40px rgba(0,0,0,.35)}
.case-head{display:flex;justify-content:space-between;align-items:center}
.eng-badge{font-size:11px;padding:4px 10px;border-radius:6px;font-family:var(--font-mono);font-weight:700;letter-spacing:.5px}
.eng-badge.bing{background:rgba(0,164,239,.14);color:#4EC8F5;border:1px solid rgba(0,164,239,.4)}
.eng-badge.google{background:rgba(66,133,244,.14);color:#6FA8FF;border:1px solid rgba(66,133,244,.4)}
.eng-badge.baidu{background:rgba(41,50,225,.18);color:#8A93FF;border:1px solid rgba(41,50,225,.5)}
.rank-badge{
  font-size:11px;padding:4px 10px;border-radius:6px;font-family:var(--font-mono);font-weight:800;letter-spacing:1px;
  color:var(--orange);border:1px solid rgba(255,138,60,.5);background:rgba(255,138,60,.08);
}
.rank-badge.hot{
  background:linear-gradient(120deg,var(--orange),#FF9A55);color:#1A0E05;border-color:transparent;
  box-shadow:0 6px 16px rgba(255,138,60,.35);
}
.case-shot{
  position:relative;flex:1;border-radius:10px;overflow:hidden;
  background:#0E1B2B;border:1px solid var(--line);min-height:150px;
}
.case-shot img{
  position:absolute;inset:0;width:100%;height:100%;object-fit:cover;display:block;
  transition:transform .5s ease;cursor:zoom-in;
}
.case-card:hover .case-shot img{transform:scale(1.05)}
.shot-ph{
  position:absolute;inset:0;display:none;flex-direction:column;justify-content:center;gap:7px;
  background:#0E1B2B;padding:14px 16px;
}
.sr-top{display:flex;align-items:center;gap:8px;font-size:11.5px;font-family:var(--font-mono)}
.sr-fav{
  width:18px;height:18px;border-radius:50%;display:grid;place-items:center;flex-shrink:0;
  background:linear-gradient(135deg,var(--cyan),var(--indigo));color:#04120C;font-size:10px;font-weight:800;
}
.sr-url{color:var(--text-2);word-break:break-all}
.sr-title{color:#fff;font-weight:700;font-size:13.5px;line-height:1.45;font-family:var(--font-sans)}
.sr-title em{color:var(--cyan);font-style:normal}
.sr-desc{color:var(--text-3);font-size:11.5px;line-height:1.6;font-family:var(--font-sans)}
.case-foot{
  display:flex;justify-content:space-between;align-items:center;gap:8px;
  font-size:11.5px;font-family:var(--font-mono);color:var(--text-3);
}
.case-foot .kw{color:var(--text-2);white-space:nowrap;overflow:hidden;text-overflow:ellipsis}
.case-foot .dur{color:var(--cyan);font-weight:700;flex-shrink:0}
.case-cta{margin-top:38px;text-align:center}

/* ========== 案例截图灯箱 ========== */
.lightbox{
  position:fixed;inset:0;z-index:999;display:flex;align-items:center;justify-content:center;
  background:rgba(4,9,16,.93);backdrop-filter:blur(8px);-webkit-backdrop-filter:blur(8px);
  opacity:0;visibility:hidden;transition:opacity .3s ease,visibility .3s ease;
}
.lightbox.open{opacity:1;visibility:visible}
.lb-stage{max-width:92vw;max-height:88vh;overflow:auto;display:flex;align-items:center;justify-content:center}
.lightbox img{
  display:block;max-width:92vw;max-height:88vh;object-fit:contain;cursor:zoom-in;
  border-radius:6px;box-shadow:0 24px 80px rgba(0,0,0,.6);
  transition:max-width .3s ease,max-height .3s ease;
}
.lightbox img.zoom{max-width:none;max-height:none;cursor:zoom-out}
.lb-close{
  position:absolute;top:18px;right:22px;width:44px;height:44px;border-radius:50%;
  border:1px solid rgba(255,255,255,.2);background:rgba(255,255,255,.06);color:#fff;
  font-size:26px;line-height:1;cursor:pointer;transition:all .25s ease;z-index:2;
}
.lb-close:hover{background:var(--orange);border-color:var(--orange);color:#1A0E05}
.lb-meta{
  position:absolute;bottom:18px;left:50%;transform:translateX(-50%);
  font-size:12px;color:var(--text-3);font-family:var(--font-mono);letter-spacing:.5px;
  white-space:nowrap;z-index:2;opacity:0;transition:opacity .3s ease .2s;
}
.lightbox.open .lb-meta{opacity:1}

/* ========== FAQ ========== */
.faq-wrap{max-width:820px;margin:0 auto}
.faq-item{
  border:1px solid var(--line);border-radius:14px;margin-bottom:14px;overflow:hidden;
  background:var(--bg-2);transition:all .3s;
}
.faq-item.open{border-color:var(--line-strong);box-shadow:var(--shadow-glow)}
.faq-q{
  width:100%;display:flex;align-items:center;gap:16px;padding:20px 24px;text-align:left;
  font-size:15px;font-weight:700;transition:all .25s;
}
.faq-q:hover{color:var(--cyan)}
.faq-q .idx{font-family:var(--font-mono);color:var(--cyan);font-size:12px;letter-spacing:1px}
.faq-q .icon{
  margin-left:auto;width:30px;height:30px;flex-shrink:0;border-radius:8px;
  border:1px solid var(--line-strong);display:grid;place-items:center;transition:all .35s;color:var(--cyan);
}
.faq-q .icon svg{width:15px;height:15px}
.faq-item.open .icon{transform:rotate(45deg);background:var(--cyan);color:#04120C;border-color:var(--cyan)}
.faq-a{max-height:0;overflow:hidden;transition:max-height .45s cubic-bezier(.25,.8,.25,1)}
.faq-a p{padding:0 24px 22px 54px;color:var(--text-2);font-size:14px}

/* ========== 联系 / 转化 ========== */
.contact-sec{position:relative}
.contact-sec::before{
  content:"";position:absolute;inset:0;
  background:radial-gradient(ellipse 80% 70% at 50% 100%,rgba(42,245,200,.06),transparent 70%);
}
.channel-grid{display:grid;grid-template-columns:repeat(3,1fr);gap:22px;max-width:960px;margin:0 auto}
.channel-card{
  position:relative;display:block;text-align:center;padding:40px 26px;border-radius:18px;
  background:var(--bg-2);border:1px solid var(--line);transition:all .4s;overflow:hidden;
}
.channel-card::after{
  content:"";position:absolute;top:0;left:0;right:0;height:3px;
  background:linear-gradient(90deg,var(--cyan),transparent);
  transform:scaleX(0);transform-origin:left;transition:transform .45s;
}
.channel-card:hover{transform:translateY(-8px);border-color:var(--line-strong);box-shadow:var(--shadow)}
.channel-card:hover::after{transform:scaleX(1)}
.channel-card.hot{border-color:var(--line-strong);box-shadow:0 0 50px rgba(42,245,200,.1)}
.channel-ic{
  width:64px;height:64px;border-radius:17px;margin:0 auto 18px;display:grid;place-items:center;
}
.channel-ic svg{width:30px;height:30px}
.channel-ic.wechat{background:linear-gradient(135deg,rgba(42,245,200,.15),rgba(42,245,200,.04));border:1px solid var(--line-strong);color:var(--cyan)}
.channel-ic.qq{background:linear-gradient(135deg,rgba(255,209,102,.14),rgba(255,209,102,.04));border:1px solid rgba(255,209,102,.4);color:var(--amber)}
.channel-ic.tg{background:linear-gradient(135deg,rgba(77,141,255,.14),rgba(77,141,255,.04));border:1px solid rgba(77,141,255,.4);color:var(--indigo)}
.channel-label{display:block;font-size:11px;letter-spacing:3px;color:var(--text-3);margin-bottom:8px;font-family:var(--font-mono)}
.channel-val{display:block;font-family:var(--font-mono);font-size:23px;font-weight:700;color:#fff;letter-spacing:.5px;margin-bottom:20px;word-break:break-all}
.channel-btn{
  display:inline-flex;align-items:center;gap:8px;padding:11px 24px;border-radius:10px;
  border:1px solid var(--line-strong);color:var(--cyan);font-size:14px;font-weight:600;
  background:rgba(42,245,200,.06);transition:all .3s;
}
.channel-btn svg{width:15px;height:15px}
.channel-card:hover .channel-btn{background:rgba(42,245,200,.15)}
.channel-btn.copied{background:var(--cyan);border-color:var(--cyan);color:#04120C}

/* ========== 页脚 ========== */
footer{border-top:1px solid var(--line);padding:54px 0 30px;margin-top:60px;background:rgba(8,12,20,.7)}
.foot-grid{display:grid;grid-template-columns:1.4fr 1fr 1fr;gap:44px;margin-bottom:40px}
.foot-brand p{color:var(--text-3);font-size:13.5px;margin-top:16px;max-width:340px}
.foot-col h4{font-family:var(--font-mono);font-size:12px;letter-spacing:3px;color:var(--cyan);margin-bottom:18px}
.foot-col a{display:block;padding:7px 0;font-size:14px;color:var(--text-2);transition:all .25s}
.foot-col a:hover{color:var(--cyan);padding-left:6px}
.foot-bottom{
  border-top:1px solid var(--line);padding-top:26px;display:flex;justify-content:space-between;flex-wrap:wrap;gap:12px;
  font-size:13px;color:var(--text-3);
}

/* 回到顶部 */
.to-top{
  position:fixed;right:26px;bottom:30px;z-index:90;width:48px;height:48px;border-radius:12px;
  background:rgba(20,35,58,.9);border:1px solid var(--line-strong);color:var(--cyan);
  display:grid;place-items:center;opacity:0;pointer-events:none;transform:translateY(14px);transition:all .35s;
}
.to-top.show{opacity:1;pointer-events:auto;transform:none}
.to-top:hover{background:var(--cyan);color:#04120C}
.to-top svg{width:20px;height:20px}

/* 滚动渐显 */
.reveal{opacity:0;transform:translateY(34px);transition:opacity .8s ease,transform .8s cubic-bezier(.25,.8,.25,1)}
.reveal.in{opacity:1;transform:none}
.reveal[data-delay="1"]{transition-delay:.1s}
.reveal[data-delay="2"]{transition-delay:.2s}
.reveal[data-delay="3"]{transition-delay:.3s}
.reveal[data-delay="4"]{transition-delay:.4s}

/* ========== 响应式 ========== */
@media (max-width:1024px){
  .hero .container{grid-template-columns:1fr;gap:44px;text-align:center}
  .hero-feats,.hero-btns{justify-content:center}
  .hero-stats{justify-content:center}
  .hero-visual{order:-1;transform:scale(.9);margin-top:-10px}
  .engine-card{grid-template-columns:1fr;padding:34px}
  .course-grid{grid-template-columns:1fr;gap:40px}
  .course-side{position:static}
  .methods{grid-template-columns:repeat(3,1fr)}
  .method-card::before{display:none}
  .data-grid{grid-template-columns:1fr 1fr}
  .case-grid{grid-template-columns:1fr 1fr}
  .track-chart{height:300px}
  .foot-grid{grid-template-columns:1fr 1fr}
}
@media (max-width:768px){
  .sec-pad{padding:74px 0}
  .nav-links{
    position:fixed;top:0;right:-100%;height:100vh;width:min(320px,84%);flex-direction:column;
    justify-content:center;gap:8px;background:rgba(11,20,32,.97);backdrop-filter:blur(20px);
    border-left:1px solid var(--line);transition:right .4s cubic-bezier(.25,.8,.25,1);z-index:98;
  }
  .nav-links.open{right:0}
  .nav-links a{font-size:16.5px;padding:12px 26px}
  .nav-links a.nav-cta{margin:14px 0 0}
  .burger{display:grid}
  .hero{padding-top:116px}
  .hero-stats{gap:22px;flex-wrap:wrap}
  .hero-stats .num{font-size:23px}
  .data-grid{grid-template-columns:1fr}
  .methods{grid-template-columns:1fr}
  .course-modules{grid-template-columns:1fr}
  .channel-grid{grid-template-columns:1fr}
  .case-grid{grid-template-columns:1fr}
  .dash-badge{right:0}
  .dash-main{flex-direction:column;gap:16px}
  .track-chart{height:300px;padding:40px 6px 0;gap:10px}
  .track-col .num{font-size:20px;top:-34px}
  .track-col .day{font-size:12px}
  .track-col .tag2{font-size:10px;padding:2px 7px}
  .faq-a p{padding-left:24px}
  .course-cta .btn{width:100%;justify-content:center}
  .engine-visual{min-height:0}
}
@media (prefers-reduced-motion:reduce){
  *,*::before,*::after{animation-duration:.001s!important;transition-duration:.001s!important}
  html{scroll-behavior:auto}
}