/* ============================================================
   MathViz · 首页 Landing
   ============================================================ */
.landing{
  /* 首页自成一个滚动容器：body 是 overflow:hidden（为固定高度的工作台设计），
     滚轮根本推不动 body；旧版靠右侧滑块程序化 scrollTop 才"能滚"，滑块移除后
     必须让 .landing 自己接管滚动。position:sticky 在最近的滚动容器内依然生效，
     顶栏 / 左侧标签栏照常吸附。 */
  height:100vh;
  overflow-y:auto;
  background:
    radial-gradient(1100px 620px at 82% -8%,rgba(79,124,255,.20),transparent 62%),
    radial-gradient(760px 520px at 8% 8%,rgba(139,92,246,.15),transparent 60%),
    radial-gradient(900px 500px at 50% 108%,rgba(35,199,217,.10),transparent 65%),
    linear-gradient(180deg,#07111F,#0A1220 55%,#07111F);
}
.land-top{
  height:60px;display:flex;align-items:center;gap:26px;padding:0 34px;
  border-bottom:1px solid rgba(30,46,74,.6);position:sticky;top:0;z-index:20;
  background:rgba(7,17,31,.72);backdrop-filter:blur(14px);
}
.land-links{display:flex;gap:4px;margin-left:14px}
.land-links a{
  padding:6px 13px;border-radius:var(--r-sm);font-size:13px;color:var(--tx-2);
  cursor:pointer;transition:.15s;
}
.land-links a:hover,.land-links a.active{color:var(--tx);background:rgba(126,124,255,.1)}
.land-actions{margin-left:auto}

.land-hero{
  position:relative;display:grid;grid-template-columns:1.02fr 1fr;gap:56px;align-items:center;
  max-width:1320px;margin:0 auto;padding:84px 42px 44px;
}
/* 坐标纸网格：呼应「数学平台」身份，极淡、径向渐隐，只铺在封面区域 */
.land-hero::before{
  content:"";position:absolute;inset:0;z-index:0;pointer-events:none;
  background:
    linear-gradient(rgba(126,156,210,.055) 1px,transparent 1px),
    linear-gradient(90deg,rgba(126,156,210,.055) 1px,transparent 1px);
  background-size:46px 46px;
  -webkit-mask-image:radial-gradient(760px 520px at 30% 38%,#000 0%,transparent 76%);
          mask-image:radial-gradient(760px 520px at 30% 38%,#000 0%,transparent 76%);
}
/* 呼吸感光晕：给封面制造清透的景深（纯装饰，不响应鼠标） */
.land-orb{
  position:absolute;border-radius:50%;filter:blur(70px);pointer-events:none;z-index:0;
}
.land-orb-a{
  width:420px;height:420px;left:-120px;top:-140px;opacity:.5;
  background:radial-gradient(circle,rgba(79,124,255,.28),transparent 68%);
  animation:orbFloat 14s ease-in-out infinite;
}
.land-orb-b{
  width:360px;height:360px;right:6%;bottom:-160px;opacity:.42;
  background:radial-gradient(circle,rgba(139,92,246,.24),transparent 68%);
  animation:orbFloat 18s ease-in-out infinite reverse;
}
@keyframes orbFloat{
  0%,100%{transform:translate(0,0) scale(1)}
  50%{transform:translate(26px,-20px) scale(1.06)}
}
.land-copy,.land-preview{position:relative;z-index:1}
.land-eyebrow{
  display:inline-flex;align-items:center;gap:8px;margin-bottom:22px;
  font-size:12px;letter-spacing:.6px;color:var(--tx-2);
  padding:6px 14px;border-radius:999px;
  background:rgba(143,162,186,.08);border:1px solid rgba(143,162,186,.16);
  backdrop-filter:blur(8px);
}
.land-eyebrow i{
  width:7px;height:7px;border-radius:50%;background:var(--cyan);
  box-shadow:0 0 10px rgba(35,199,217,.9);animation:orbPulse 2.4s ease-in-out infinite;
}
@keyframes orbPulse{
  0%,100%{opacity:1;box-shadow:0 0 6px rgba(35,199,217,.7)}
  50%{opacity:.55;box-shadow:0 0 14px rgba(35,199,217,1)}
}
.land-copy h1{
  font-size:48px;line-height:1.26;letter-spacing:-.5px;font-weight:800;margin-bottom:20px;
  background:linear-gradient(120deg,#F6FAFF 24%,#B7C9FF 64%,#A88BFF 100%);
  -webkit-background-clip:text;background-clip:text;-webkit-text-fill-color:transparent;
  filter:drop-shadow(0 3px 22px rgba(79,124,255,.20));
}
.land-copy h1 em{
  font-style:normal;
  background:linear-gradient(120deg,#8FB4FF,#3FE0EF);
  -webkit-background-clip:text;background-clip:text;-webkit-text-fill-color:transparent;
}
.land-sub{color:#A9B8CD;font-size:15px;line-height:1.85;max-width:520px;margin-bottom:30px}
.land-cta{display:flex;gap:12px;margin-bottom:40px;flex-wrap:wrap}
.land-cta .btn-primary{padding:11px 24px;font-size:14px}
.land-stats{display:flex;gap:0}
.land-stats div{
  display:flex;flex-direction:column;gap:2px;padding:0 34px;
  border-left:1px solid rgba(143,162,186,.16);
}
.land-stats div:first-child{padding-left:0;border-left:none}
.land-stats b{
  font-size:26px;font-weight:800;
  background:linear-gradient(120deg,#F6FAFF,#A6BEFF);
  -webkit-background-clip:text;background-clip:text;-webkit-text-fill-color:transparent;
}
.land-stats span{font-size:11.5px;color:var(--tx-2);letter-spacing:.4px}
.land-preview{
  position:relative;border-radius:20px;
  border:1px solid rgba(157,182,255,.16);
  background:linear-gradient(165deg,rgba(19,31,50,.55),rgba(10,18,32,.42));
  backdrop-filter:blur(16px);
  box-shadow:0 24px 70px rgba(3,10,22,.5),0 0 0 1px rgba(255,255,255,.03) inset;
  transition:.3s;
}
.land-preview:hover{
  border-color:rgba(157,182,255,.30);
  box-shadow:0 28px 80px rgba(3,10,22,.55),0 0 46px rgba(79,124,255,.15),0 0 0 1px rgba(255,255,255,.04) inset;
}
/* 顶部高光细线：玻璃质感的点睛之笔 */
.land-preview::before{
  content:"";position:absolute;left:8%;right:8%;top:0;height:1px;z-index:2;
  background:linear-gradient(90deg,transparent,rgba(169,190,255,.55),transparent);
}
/* 内侧渐晕：把视线收向画面中心，卡片更有纵深感 */
.land-preview::after{
  content:"";position:absolute;inset:0;z-index:1;pointer-events:none;border-radius:19px;
  background:radial-gradient(125% 95% at 50% 4%,transparent 58%,rgba(4,10,20,.40) 100%);
}
.land-preview canvas{width:100%;display:block;border-radius:19px}
.land-preview-tag{
  position:absolute;top:14px;left:16px;z-index:3;
  display:inline-flex;align-items:center;gap:7px;
  font-size:10.5px;color:var(--cyan);
  background:rgba(7,17,31,.55);padding:5px 12px;border-radius:20px;
  border:1px solid rgba(35,199,217,.28);backdrop-filter:blur(10px);
}
.land-preview-tag i{
  width:6px;height:6px;border-radius:50%;background:var(--cyan);
  box-shadow:0 0 8px rgba(35,199,217,.9);animation:orbPulse 2.4s ease-in-out infinite;
}
/* 方程玻璃芯片：替代 canvas 内绘制的暗色小字（canvas font 不认 CSS 变量，渲染发虚） */
.land-eq-chip{
  position:absolute;left:16px;bottom:14px;z-index:3;
  display:flex;flex-direction:column;gap:3px;
  padding:10px 14px;border-radius:12px;
  background:rgba(7,17,31,.60);border:1px solid rgba(35,199,217,.22);
  backdrop-filter:blur(10px);
}
.land-eq-chip span{
  font-size:11.5px;line-height:1.55;color:#C6ECF3;white-space:nowrap;
  font-family:var(--mono);letter-spacing:.3px;
}
/* 悬浮参数胶囊：与方程联动（σ ρ β 正是 Lorenz 三参数），制造景深与科普感 */
.land-float-chip{
  position:absolute;z-index:3;padding:7px 13px;border-radius:999px;
  font-size:11.5px;font-family:var(--mono);color:#CFE2FF;white-space:nowrap;
  background:rgba(13,24,42,.68);border:1px solid rgba(122,160,255,.30);
  backdrop-filter:blur(10px);
  box-shadow:0 8px 24px rgba(3,10,22,.4);
  animation:chipFloat 7s ease-in-out infinite;
  pointer-events:none;
}
.chip-a{top:16%;right:-15px}
.chip-b{top:50%;right:-9px;animation-delay:-2.4s;color:#E4DBFF;border-color:rgba(139,92,246,.36)}
.chip-c{bottom:22%;right:11%;animation-delay:-4.8s;color:#C9F4F8;border-color:rgba(35,199,217,.32)}
@keyframes chipFloat{
  0%,100%{transform:translateY(0)}
  50%{transform:translateY(-9px)}
}

/* ============================================================
   ★ 封面精修 · 3D 透视悬浮 + 玻璃拟态 + 霓虹
   参考「探索混沌之美」：卡片以透视角度悬浮于深空之上，参数胶囊玻璃透亮。
   ============================================================ */

/* 卡片下方的辉光池：让悬浮卡片「压」在背景上，产生真实景深 */
.land-preview-glow{
  position:absolute;z-index:0;pointer-events:none;
  left:6%;right:2%;bottom:-34px;height:120px;
  background:radial-gradient(60% 100% at 50% 0%,rgba(79,124,255,.30),transparent 72%);
  filter:blur(28px);
}

/* 3D 透视悬浮卡片（角度由 --tilt-y/--tilt-x 承载，默认静止值；JS 可做鼠标视差驱动） */
.land-preview{
  --tilt-y:-11deg; --tilt-x:3deg; --lift-y:0px;
  transform:perspective(1500px) rotateY(var(--tilt-y)) rotateX(var(--tilt-x)) translateY(var(--lift-y));
  transform-origin:center right;
  transform-style:preserve-3d;
  transition:transform .5s cubic-bezier(.22,.61,.36,1),box-shadow .3s,border-color .3s;
  border-radius:22px;
  background:linear-gradient(165deg,rgba(28,42,72,.62),rgba(11,20,36,.50));
  border:1px solid rgba(157,182,255,.24);
  box-shadow:
    0 40px 90px rgba(2,8,20,.62),
    0 0 60px rgba(79,124,255,.20),
    0 0 0 1px rgba(255,255,255,.05) inset;
  -webkit-backdrop-filter:blur(20px) saturate(140%);backdrop-filter:blur(20px) saturate(140%);
}
.land-preview:hover{
  border-color:rgba(157,182,255,.40);
  box-shadow:
    0 46px 100px rgba(2,8,20,.66),
    0 0 76px rgba(79,124,255,.30),
    0 0 0 1px rgba(255,255,255,.07) inset;
}

/* 顶部高光加长、更有玻璃质感 */
.land-preview::before{
  left:6%;right:6%;
  background:linear-gradient(90deg,transparent,rgba(190,210,255,.75),rgba(160,190,255,.45),transparent);
  height:1.5px;
}

/* 参数胶囊：更透亮 + 霓虹描边 + 顶部高光 */
.land-float-chip{
  background:rgba(16,28,50,.58);
  -webkit-backdrop-filter:blur(14px) saturate(150%);backdrop-filter:blur(14px) saturate(150%);
  border:1px solid rgba(122,160,255,.42);
  box-shadow:
    0 10px 30px rgba(3,10,22,.5),
    0 0 18px rgba(79,124,255,.20),
    inset 0 1px 0 rgba(255,255,255,.14);
  padding:8px 15px;font-size:12px;
}
.chip-a{color:#D6E6FF}
.chip-b{
  color:#E8DDFF;border-color:rgba(139,92,246,.50);
  box-shadow:0 10px 30px rgba(3,10,22,.5),0 0 20px rgba(139,92,246,.26),inset 0 1px 0 rgba(255,255,255,.14);
}
.chip-c{
  color:#CFF6FA;border-color:rgba(35,199,217,.46);
  box-shadow:0 10px 30px rgba(3,10,22,.5),0 0 20px rgba(35,199,217,.24),inset 0 1px 0 rgba(255,255,255,.14);
}

/* 方程玻璃芯片更立体 */
.land-eq-chip{
  background:rgba(9,20,38,.62);
  -webkit-backdrop-filter:blur(14px) saturate(140%);backdrop-filter:blur(14px) saturate(140%);
  border:1px solid rgba(35,199,217,.30);
  box-shadow:0 12px 32px rgba(3,10,22,.5),inset 0 1px 0 rgba(255,255,255,.10);
}

/* 主标题：渐变微光流动
   注意：background 简写会把 background-clip 重置为 border-box，
   必须在后面重新显式声明 text 裁切，否则渐变铺满方块、文字被透明填充成不可见。
   同时避免给裁切文字加 filter（会新建渲染层导致部分引擎裁切失效）。 */
.land-copy h1{
  background-image:linear-gradient(115deg,#F8FBFF 20%,#A9C4FF 48%,#C4A9FF 68%,#7FE6F2 100%);
  background-size:220% 100%;
  -webkit-background-clip:text;background-clip:text;
  -webkit-text-fill-color:transparent;color:transparent;
  animation:titleSheen 9s ease-in-out infinite;
}
@keyframes titleSheen{
  0%,100%{background-position:0% 50%}
  50%{background-position:100% 50%}
}

/* CTA 主按钮：更强光晕 */
.land-cta .btn-primary{
  box-shadow:0 12px 34px rgba(79,124,255,.44),inset 0 1px 0 rgba(255,255,255,.26);
}
.land-cta .btn-primary:hover{
  box-shadow:0 16px 42px rgba(79,124,255,.56),inset 0 1px 0 rgba(255,255,255,.32);
}

/* 眉标胶囊更通透 */
.land-eyebrow{
  background:rgba(20,32,56,.52);
  -webkit-backdrop-filter:blur(12px) saturate(140%);backdrop-filter:blur(12px) saturate(140%);
  border-color:rgba(143,178,235,.24);
  box-shadow:inset 0 1px 0 rgba(255,255,255,.10);
}

/* 顶部导航玻璃感（随滚动更实） */
.land-top{
  background:rgba(7,17,31,.62);
  -webkit-backdrop-filter:blur(18px) saturate(150%);backdrop-filter:blur(18px) saturate(150%);
  border-bottom-color:rgba(157,182,255,.14);
  box-shadow:0 1px 0 rgba(255,255,255,.05),0 8px 28px rgba(2,8,20,.35);
}

/* ---- 响应式：窄屏取消 3D 倾斜，避免内容被压扁 ---- */
@media (max-width:1080px){
  .land-preview{transform:none;transform-style:flat}
  .land-preview:hover{transform:none}
}

.land-pillars{
  display:flex;gap:18px;max-width:1320px;margin:0 auto;padding:8px 42px 34px;
}
.pillar{
  flex:1;display:flex;flex-direction:column;gap:2px;padding:16px 18px;border-radius:var(--r-lg);
  background:rgba(16,27,45,.6);border:1px solid var(--line);
}
.pillar-ico{font-size:19px;color:var(--cyan);margin-bottom:6px}
.pillar b{font-size:15px}
.pillar span{font-size:11.5px;color:var(--tx-3)}

/* ---------- 每日一探究竟（按日期轮换） ---------- */
.land-daily{
  max-width:1320px;margin:0 auto;padding:0 42px 6px;
}
.ld-card{
  display:flex;flex-direction:column;gap:10px;
  padding:16px 20px;border-radius:14px;
  background:linear-gradient(135deg, rgba(79,124,255,.14), rgba(139,92,246,.10) 55%, rgba(35,199,217,.08));
  border:1px solid rgba(79,124,255,.32);
  box-shadow:0 10px 30px rgba(3,10,22,.35);
}
.ld-head{display:flex;align-items:center;gap:10px;flex-wrap:wrap}
.ld-badge{
  font-size:11px;font-weight:800;letter-spacing:.4px;color:#04101f;
  background:linear-gradient(90deg,#4F7CFF,#8B5CF6);
  padding:3px 9px;border-radius:999px;
}
.ld-date{font-size:11px;color:var(--tx-3);font-variant-numeric:tabular-nums}
.ld-tag{
  font-size:11px;color:var(--cyan);border:1px solid rgba(35,199,217,.4);
  padding:2px 8px;border-radius:999px;
}
.ld-body{display:flex;flex-direction:column;gap:6px}
.ld-q{margin:0;font-size:15px;font-weight:700;color:var(--tx);line-height:1.55}
.ld-why{margin:0;font-size:12.5px;color:var(--tx-2);line-height:1.6}
.ld-acts{display:flex;gap:8px;flex-wrap:wrap;margin-top:2px}

/* ---------- 探索画廊（真实可交互 Demo 卡片） ---------- */
.land-explore{
  max-width:1320px;margin:0 auto;padding:6px 42px 64px;
}
.le-head{margin-bottom:20px}
.le-head h2{font-size:24px;font-weight:800;letter-spacing:-.3px;margin-bottom:6px}
.le-head p{font-size:13px;color:var(--tx-2);line-height:1.6}
.land-gallery{
  display:grid;grid-template-columns:repeat(auto-fill,minmax(300px,1fr));gap:16px;
}
.g-card{
  background:linear-gradient(180deg,rgba(19,31,50,.92),rgba(10,18,32,.92));
  border:1px solid var(--line);border-radius:var(--r-lg);padding:14px 15px 15px;
  transition:.2s;position:relative;overflow:hidden;
}
.g-card:hover{transform:translateY(-4px);border-color:var(--blue-soft);
  box-shadow:0 16px 38px rgba(79,124,255,.18)}
.g-head{display:flex;align-items:center;justify-content:space-between;margin-bottom:10px}
.g-head h3{font-size:14.5px;font-weight:700}
.g-open{
  font-size:11px;color:var(--blue);background:rgba(79,124,255,.12);
  border:1px solid rgba(79,124,255,.32);border-radius:20px;padding:4px 10px;cursor:pointer;
  transition:.15s;white-space:nowrap;
}
.g-open:hover{background:rgba(79,124,255,.24);color:#fff}
.g-canvas{width:100%;height:158px;display:block;border-radius:var(--r-sm);
  background:var(--bg-1);border:1px solid var(--line-soft)}
.g-desc{font-size:11.5px;color:var(--tx-3);line-height:1.6;margin:11px 0 12px;min-height:34px}
.g-ctrl{display:flex;align-items:center;gap:9px;flex-wrap:wrap}
.g-cl{font-size:11px;color:var(--tx-2);min-width:62px}
.g-cv{font-size:11px;color:var(--blue);font-family:var(--mono);min-width:34px;text-align:right}
.g-ctrl input[type=range]{
  flex:1;min-width:120px;-webkit-appearance:none;appearance:none;height:5px;border-radius:3px;outline:none;cursor:pointer;
  background:linear-gradient(90deg,var(--blue) 0%,var(--blue) var(--pct,50%),var(--line) var(--pct,50%));
}
.g-ctrl input[type=range]::-webkit-slider-thumb{
  -webkit-appearance:none;width:14px;height:14px;border-radius:50%;background:var(--blue);
  border:2px solid var(--bg-2);cursor:pointer;box-shadow:0 0 0 1px var(--blue);
}
.g-ctrl input[type=range]::-moz-range-thumb{
  width:14px;height:14px;border-radius:50%;background:var(--blue);border:2px solid var(--bg-2);cursor:pointer;
}

@media(max-width:1180px){
  .land-hero{grid-template-columns:1fr;padding-top:38px}
  .land-copy h1{font-size:34px;filter:none}
  .land-gallery{grid-template-columns:repeat(auto-fill,minmax(260px,1fr))}
  .land-orb{display:none}
  .land-float-chip{display:none}
}

/* 导航滚动定位的目标高亮 */
.land-flash{
  border-radius:14px;animation:landFlash 1.4s ease-out 2;
}
@keyframes landFlash{
  0%{box-shadow:0 0 0 1px rgba(79,124,255,0);background:rgba(79,124,255,0)}
  35%{box-shadow:0 0 0 1px rgba(79,124,255,.55);background:rgba(79,124,255,.07)}
  100%{box-shadow:0 0 0 1px rgba(79,124,255,0);background:rgba(79,124,255,0)}
}

/* ============================================================
   首页核心：左侧竖框导航 + 右侧态势大屏（dashboard 分栏）
   ============================================================ */
.land-dash{
  display:grid;grid-template-columns:206px 1fr;gap:22px;
  max-width:1320px;margin:8px auto 0;padding:18px 42px 64px;align-items:start;
}
.ld-nav{
  position:sticky;top:74px;align-self:start;
  display:flex;flex-direction:column;gap:8px;
}
.ld-tab{
  display:flex;align-items:center;gap:11px;
  padding:12px 15px;border-radius:13px;
  border:1px solid transparent;background:rgba(16,27,45,.5);
  color:var(--tx-2);cursor:pointer;font-size:14.5px;font-family:inherit;text-align:left;
  transition:.16s;
}
.ld-tab:hover{color:var(--tx);background:rgba(79,124,255,.10)}
.ld-tab.active{
  color:#fff;
  background:linear-gradient(120deg,rgba(79,124,255,.24),rgba(139,92,246,.18));
  border-color:rgba(79,124,255,.42);
  box-shadow:0 6px 18px rgba(79,124,255,.16);
}
.ld-ico{font-size:17px;width:22px;text-align:center;flex:none}
.ld-tx{font-weight:600;letter-spacing:.3px}

.ld-stage{position:relative;min-height:62vh}
.ld-view{display:none}
.ld-view.active{display:block;animation:ldFade .26s ease}
@keyframes ldFade{from{opacity:0;transform:translateY(7px)}to{opacity:1;transform:none}}

/* 每日一探究竟（移入探索画廊顶部） */
.ld-daily{margin:0 0 14px}

/* ---------- 常用函数 · 态势大屏 ---------- */
.ldf-head{margin-bottom:16px}
.ldf-head h2{font-size:24px;font-weight:800;letter-spacing:-.3px;margin-bottom:6px}
.ldf-head p{font-size:13px;color:var(--tx-2);line-height:1.6;margin:0}
.ldf-grid{display:grid;grid-template-columns:repeat(auto-fill,minmax(244px,1fr));gap:16px}
.ldf-card{
  position:relative;display:flex;flex-direction:column;gap:9px;
  padding:12px;border-radius:15px;overflow:hidden;cursor:pointer;
  text-align:left;font-family:inherit;color:var(--tx);
  border:1px solid var(--line);
  background:linear-gradient(180deg,rgba(19,31,50,.92),rgba(10,18,32,.92));
  transition:.18s;
}
.ldf-card:hover{transform:translateY(-4px);border-color:var(--blue-soft);
  box-shadow:0 16px 38px rgba(79,124,255,.18)}
.ldf-cv{width:100%;height:112px;display:block;border-radius:10px;
  background:#07101E;border:1px solid var(--line-soft)}
.ldf-meta{display:flex;align-items:baseline;gap:8px;flex-wrap:wrap;padding:0 2px}
.ldf-name{font-size:14.5px;font-weight:700}
.ldf-expr{font-size:11px;color:var(--cyan);font-family:var(--mono)}
.ldf-copy{
  position:absolute;top:11px;right:11px;font-size:12px;color:var(--tx-3);
  background:rgba(7,17,31,.7);border:1px solid var(--line);border-radius:8px;
  padding:2px 8px;cursor:pointer;transition:.15s;
}
.ldf-copy:hover{color:var(--cyan);border-color:rgba(35,199,217,.4)}
.ldf-add{
  grid-column:1 / -1;justify-self:start;margin-top:4px;
  padding:9px 17px;border:1px dashed var(--line-2);border-radius:14px;
  background:none;color:var(--tx-3);font-size:12.5px;cursor:pointer;font-family:inherit;
  transition:.15s;
}
.ldf-add:hover{color:var(--tx-1);border-color:var(--blue)}

/* ---------- 挑战关卡总览 ---------- */
.ldq-head{margin-bottom:16px}
.ldq-head h2{font-size:24px;font-weight:800;letter-spacing:-.3px;margin-bottom:6px}
.ldq-head p{font-size:13px;color:var(--tx-2);line-height:1.6;margin:0}
.ldq-grid{display:grid;grid-template-columns:repeat(auto-fill,minmax(286px,1fr));gap:16px}
.ldq-card{
  display:flex;flex-direction:column;gap:10px;padding:16px;border-radius:15px;
  border:1px solid var(--line);
  background:linear-gradient(180deg,rgba(19,31,50,.92),rgba(10,18,32,.92));
}
.ldq-top{display:flex;align-items:center;justify-content:space-between;gap:8px}
.ldq-title{font-size:15px;font-weight:700}
.ldq-scene{font-size:10.5px;color:var(--cyan);font-family:var(--mono);
  border:1px solid rgba(35,199,217,.35);border-radius:999px;padding:2px 9px}
.ldq-brief{margin:0;font-size:12px;color:var(--tx-3);line-height:1.6;flex:1}
.ldq-go{align-self:flex-start;margin-top:4px;padding:6px 13px;
  border:1px solid rgba(79,124,255,.35);border-radius:10px;
  background:rgba(79,124,255,.12);color:var(--blue);font-size:12px;cursor:pointer;font-family:inherit;
  transition:.15s}
.ldq-go:hover{background:rgba(79,124,255,.24);color:#fff}

/* ---------- AI 助手介绍 ---------- */
.ldai-card{
  max-width:660px;margin:36px auto;padding:36px 30px;text-align:center;
  border-radius:20px;border:1px solid rgba(139,92,246,.3);
  background:linear-gradient(135deg,rgba(79,124,255,.14),rgba(139,92,246,.10) 55%,rgba(35,199,217,.08));
}
.ldai-ico{font-size:42px;color:var(--purple);margin-bottom:10px}
.ldai-card h2{font-size:26px;font-weight:800;margin-bottom:10px}
.ldai-sub{font-size:14px;color:var(--tx-2);line-height:1.75;margin:0 0 22px}
.ldai-go{padding:11px 23px;border:none;border-radius:12px;cursor:pointer;font-family:inherit;
  font-size:14px;font-weight:700;color:#fff;background:linear-gradient(90deg,var(--blue),var(--purple));
  transition:.15s}
.ldai-go:hover{filter:brightness(1.1)}

/* 窄屏：竖导航转为横排 */
@media(max-width:1180px){
  .land-dash{grid-template-columns:1fr;gap:14px;padding-top:10px}
  .ld-nav{position:static;flex-direction:row;flex-wrap:wrap;top:auto}
  .ld-tab{flex:1 1 auto;justify-content:center}
}

/* 手机：首页单列、顶栏收纳、预览铺满 */
@media(max-width:760px){
  .land-top{flex-wrap:wrap;gap:8px;padding:10px 12px}
  .land-links{order:3;width:100%;display:flex;justify-content:space-between;gap:4px}
  .land-links a{font-size:13px;padding:6px 2px}
  .land-actions{margin-left:auto}
  .land-hero{padding:24px 14px 10px;gap:24px}
  .land-copy h1{font-size:27px;line-height:1.35}
  .land-sub{font-size:13.5px}
  .land-cta{flex-wrap:wrap;gap:10px}
  .land-cta .btn-primary,.land-cta .btn-outline{flex:1 1 100%}
  .land-stats{width:100%;justify-content:space-around;gap:8px}
  .land-preview{width:100%}
  .land-preview canvas{width:100%;height:auto;display:block}
  .land-daily{flex-direction:column}
}