:root{--ink:#102e39;--deep:#153743;--paper:#f5eddd;--gold:#d7aa55;--clay:#a45b3b;--jade:#2e7768;--line:rgba(16,46,57,.15)}*{box-sizing:border-box}body{margin:0;background:var(--paper);color:var(--ink);font-family:"Microsoft YaHei","PingFang SC",Arial,sans-serif;line-height:1.7}.global-header{height:68px;background:#0e2937;color:#fff;display:flex;align-items:center;justify-content:space-between;padding:0 clamp(16px,4vw,60px)}.brand{display:flex;align-items:center;gap:10px;color:#fff;text-decoration:none}.brand img{width:36px}.global-header nav{display:flex;gap:26px}.global-header nav a{color:#dce8e8;text-decoration:none}.global-header nav a.active{color:#efc66f}.shell{width:min(1160px,calc(100% - 36px));margin:auto}.hero{background:radial-gradient(circle at 75% 20%,rgba(215,170,85,.18),transparent 25%),linear-gradient(135deg,#0d2935,#19414b);color:#fff;padding:90px 0 110px;overflow:hidden}.hero-grid{display:grid;grid-template-columns:1.1fr .9fr;gap:60px;align-items:center}.kicker{color:var(--gold);font-weight:800;letter-spacing:.14em;font-size:13px}.kicker.dark{color:var(--clay)}h1,h2,h3{font-family:STKaiti,KaiTi,serif}.hero h1{font-size:76px;line-height:1;margin:0}.hero h2{font-size:34px;color:#f0cf87;margin:14px 0}.hero .lead{font-size:22px}.button{display:inline-flex;border-radius:999px;background:var(--gold);color:#173743;text-decoration:none;padding:12px 22px;font-weight:800;margin-top:24px}.evidence-orbit{width:390px;height:390px;border:1px solid rgba(255,255,255,.18);border-radius:50%;position:relative;margin:auto}.evidence-orbit:before,.evidence-orbit:after{content:"";position:absolute;inset:55px;border:1px dashed rgba(255,255,255,.15);border-radius:50%}.evidence-orbit:after{inset:120px}.core{position:absolute;inset:135px;border-radius:50%;background:var(--gold);color:#18343d;display:grid;place-items:center;text-align:center;font-size:26px;font-family:STKaiti,KaiTi,serif;font-weight:800}.evidence-orbit span{position:absolute;left:50%;top:50%;transform:rotate(calc(var(--i)*51.43deg)) translateY(-180px) rotate(calc(var(--i)*-51.43deg));transform-origin:center;background:#254b55;border:1px solid rgba(255,255,255,.18);width:58px;height:58px;border-radius:50%;display:grid;place-items:center;color:#f2d18b;font-weight:800}.section{padding:82px 0}.section header h2,.dark-section h2{font-size:48px;margin:0 0 30px}.lines{display:grid;grid-template-columns:repeat(5,1fr);gap:14px}.lines article{background:#fffaf0;border:1px solid var(--line);border-radius:20px;padding:22px}.lines b,.lines span{display:block}.lines b{font-size:20px;color:var(--clay)}.dark-section{background:#173743;color:#fff;padding:82px 0}.chapters{display:grid;grid-template-columns:repeat(3,1fr);gap:18px}.chapters article{background:rgba(255,255,255,.07);border:1px solid rgba(255,255,255,.16);border-radius:22px;padding:24px}.chapters span{color:#efc66f;font-weight:800}.chapters h3{font-size:28px;margin:8px 0}.course-road{display:grid;grid-template-columns:repeat(5,1fr);gap:14px;margin-top:30px}.road-card{border-radius:18px;background:rgba(255,255,255,.07);border:1px solid rgba(255,255,255,.15);padding:18px;color:#fff;text-decoration:none;min-height:150px}.road-card.live{background:#f5e6bd;color:#173743}.road-card.building{border-color:#d7aa55}.road-card span{font-size:12px;color:#efc66f}.road-card.live span{color:#9f5c37}.road-card h3{font-size:22px;margin:8px 0}.road-card small{color:#bcd0d3}.road-card.live small{color:#5a6b70}.toolbox{display:grid;grid-template-columns:repeat(6,1fr);gap:14px}.toolbox article{background:#fffaf0;border:1px solid var(--line);border-radius:18px;padding:20px;text-align:center}.toolbox span{display:grid;place-items:center;width:46px;height:46px;border-radius:50%;background:#173743;color:#efc66f;margin:auto;font-weight:800}.toolbox h3{font-size:24px;margin:10px 0 0}.summary{background:#eadcbf;text-align:center}.summary h2{font-size:44px;margin:0}.summary p{font-size:20px}footer{background:#0d2935;color:#dce8e8;padding:28px clamp(16px,4vw,60px);display:flex;justify-content:space-between}.mobile-dock{display:none}@media(max-width:900px){.global-header nav{display:none}.hero-grid{grid-template-columns:1fr}.evidence-orbit{width:320px;height:320px}.evidence-orbit span{transform:rotate(calc(var(--i)*51.43deg)) translateY(-145px) rotate(calc(var(--i)*-51.43deg))}.core{inset:110px}.lines,.chapters,.course-road,.toolbox{grid-template-columns:repeat(2,1fr)}footer{padding-bottom:90px;flex-direction:column}.mobile-dock{display:grid;grid-template-columns:repeat(4,1fr);position:fixed;bottom:0;left:0;right:0;background:#0d2935}.mobile-dock a{text-decoration:none;color:#bcd0d3;text-align:center;padding:8px}.mobile-dock a.active{color:#efc66f}.mobile-dock span,.mobile-dock small{display:block}}@media(max-width:560px){.hero{padding:60px 0 80px}.hero h1{font-size:54px}.hero h2{font-size:26px}.section header h2,.dark-section h2{font-size:36px}.lines,.chapters,.course-road,.toolbox{grid-template-columns:1fr}.evidence-orbit{width:280px;height:280px}.evidence-orbit span{width:50px;height:50px;transform:rotate(calc(var(--i)*51.43deg)) translateY(-128px) rotate(calc(var(--i)*-51.43deg))}.core{inset:95px}}

/* V0.2.0 图文整合 */
.hero-art{margin:0;position:relative;border-radius:28px;overflow:hidden;min-height:390px;box-shadow:0 28px 70px rgba(0,0,0,.32);border:1px solid rgba(255,255,255,.16);background:#0d2935}
.hero-art img{width:100%;height:390px;display:block;object-fit:cover;object-position:center;filter:saturate(.9) contrast(1.04)}
.hero-art:after{content:"";position:absolute;inset:0;background:linear-gradient(180deg,transparent 58%,rgba(8,27,35,.72))}
.hero-art figcaption,.wide-visual figcaption,.chapter-visual figcaption,.detective-visual figcaption{position:absolute;right:12px;bottom:10px;z-index:2;background:rgba(10,34,43,.82);color:#f4d18b;border:1px solid rgba(255,255,255,.2);border-radius:999px;padding:4px 10px;font-size:12px;line-height:1.2}
.wide-visual{margin:28px 0 0;position:relative;border-radius:24px;overflow:hidden;background:#d7c9ae;box-shadow:0 16px 36px rgba(16,46,57,.13)}
.wide-visual img{display:block;width:100%;height:440px;object-fit:cover;object-position:center}
.chapters article{overflow:hidden;padding:0 0 24px}
.chapters article>span,.chapters article>h3,.chapters article>p{display:block;margin-left:24px;margin-right:24px}
.chapter-visual{position:relative;margin:0 0 18px;height:190px;overflow:hidden;border-radius:20px 20px 0 0}
.chapter-visual img{width:100%;height:100%;display:block;object-fit:cover}
.chapter-visual:after{content:"";position:absolute;inset:0;background:linear-gradient(180deg,transparent 48%,rgba(8,28,36,.52))}
.detective-feature{margin-top:22px;display:grid;grid-template-columns:220px 1fr;align-items:center;gap:22px;padding:14px;background:rgba(255,255,255,.07);border:1px solid rgba(255,255,255,.16);border-radius:22px;color:#fff;text-decoration:none}
.detective-feature:hover{background:rgba(255,255,255,.11)}
.detective-visual{position:relative;margin:0;height:150px;border-radius:16px;overflow:hidden}
.detective-visual img{width:100%;height:100%;display:block;object-fit:cover}
.detective-feature span{color:#efc66f;font-weight:800;font-size:13px}
.detective-feature h3{font-size:28px;margin:6px 0}
.detective-feature p{margin:0;color:#d8e4e4}
@media(max-width:900px){.hero-art{min-height:320px}.hero-art img{height:320px}.wide-visual img{height:340px}.detective-feature{grid-template-columns:180px 1fr}}
@media(max-width:560px){.hero-art{min-height:240px;border-radius:20px}.hero-art img{height:240px}.wide-visual img{height:260px}.chapter-visual{height:210px}.detective-feature{grid-template-columns:1fr}.detective-visual{height:220px}}


/* V0.3.0 课程音频系统 */
.sr-only{position:absolute!important;width:1px!important;height:1px!important;padding:0!important;margin:-1px!important;overflow:hidden!important;clip:rect(0,0,0,0)!important;white-space:nowrap!important;border:0!important}
.header-actions{display:flex;align-items:center;gap:18px}.sound-toggle{display:inline-flex;align-items:center;gap:7px;min-height:38px;padding:7px 11px;border:1px solid rgba(255,255,255,.24);border-radius:999px;background:rgba(255,255,255,.08);color:#fff;cursor:pointer;font-size:12px;font-weight:800}.sound-toggle:hover{border-color:#efc66f}.sound-toggle.is-off{background:rgba(255,255,255,.04);color:#aebec1}.sound-toggle-icon{font-size:15px;line-height:1}
.audio-button{display:inline-flex;align-items:center;justify-content:center;gap:8px;min-height:42px;padding:9px 14px;border:1px solid rgba(16,47,59,.22);border-radius:999px;background:#fffaf0;color:#173743;cursor:pointer;font-weight:800;line-height:1.2;transition:transform .18s ease,border-color .18s ease,background .18s ease;touch-action:manipulation;-webkit-tap-highlight-color:transparent}.audio-button:hover:not(:disabled){transform:translateY(-1px);border-color:#d5aa57}.audio-button:focus-visible,.sound-toggle:focus-visible{outline:3px solid rgba(213,170,87,.3);outline-offset:3px}.audio-button:disabled{cursor:not-allowed;opacity:.48}.audio-icon{display:grid;place-items:center;min-width:18px;font-size:16px}.audio-state{font-size:11px;color:#7a6651}.audio-button.is-playing{background:#2f7569;border-color:#2f7569;color:#fff}.audio-button.is-playing .audio-state{color:#d5eee7}.audio-button.is-paused{background:#e5eef2;border-color:#6f98a5}.audio-button.is-loading{cursor:progress}.hero-audio{border-color:rgba(255,255,255,.48);background:rgba(7,27,35,.58);color:#fff}.hero-audio .audio-state,.light-audio .audio-state,.closing-audio .audio-state{color:#f1d89e}.light-audio{border-color:rgba(255,255,255,.34);background:rgba(255,255,255,.08);color:#fff}.section-audio{margin-top:12px}.audio-actions{display:flex;gap:10px;flex-wrap:wrap;margin-top:18px}
.audio-guide-section,.learning-guide{padding:28px 0;background:#eadfc8}.audio-guide-card,.learning-guide-card{display:grid;grid-template-columns:1fr auto;gap:24px;align-items:center;background:#fffaf0;border:1px solid rgba(16,47,59,.14);border-radius:22px;padding:24px;box-shadow:0 12px 30px rgba(15,39,47,.08)}.audio-guide-card h2,.learning-guide-card h2{font-family:STKaiti,KaiTi,serif;font-size:30px;margin:2px 0}.audio-guide-card p,.learning-guide-card p{margin:0;color:#5e7077}.guide-kicker{color:#a85d3b;font-size:12px;font-weight:800;letter-spacing:.12em}.guide-mark{display:grid;place-items:center;width:52px;height:52px;border-radius:50%;background:#173743;color:#efc66f;font-weight:900;font-size:22px}.learning-guide-card{grid-template-columns:auto 1fr auto}
.audio-detail-card{display:grid;grid-template-columns:.75fr 1.25fr;gap:18px;align-items:center;margin-top:24px;padding:18px;border-radius:22px;background:#fffaf0;border:1px solid rgba(16,47,59,.15)}.audio-detail-copy strong{display:block;font-family:STKaiti,KaiTi,serif;font-size:24px}.audio-detail-copy p{color:#65747a}.audio-detail-card .lesson-card-figure{margin:0}.compact-audio{margin-top:6px}
.closing-audio-section{padding:24px 0 54px;background:#eadfc8}.closing-audio-card{display:flex;align-items:center;justify-content:space-between;gap:28px;padding:28px;border-radius:24px;background:linear-gradient(135deg,#102f3b,#1d4b55);color:#fff}.closing-audio-card h2{font-family:STKaiti,KaiTi,serif;font-size:34px;margin:3px 0}.closing-audio-card p{margin:0;color:#d7e3e4}.closing-audio{flex:0 0 auto;border-color:rgba(255,255,255,.35);background:rgba(255,255,255,.09);color:#fff}
@media(max-width:900px){.header-actions nav{display:none}.sound-toggle-label{display:none}.audio-guide-card,.learning-guide-card{grid-template-columns:1fr}.guide-mark{display:none}.guide-audio{justify-self:start}.audio-detail-card{grid-template-columns:1fr}.closing-audio-card{align-items:stretch;flex-direction:column}.closing-audio{align-self:flex-start}}
@media(max-width:560px){.sound-toggle{padding:7px 9px}.audio-actions,.hero-audio-actions{flex-direction:column;align-items:stretch}.audio-actions .audio-button,.hero-audio-actions .audio-button{width:100%}.audio-guide-card,.learning-guide-card{padding:20px}.audio-guide-card h2,.learning-guide-card h2{font-size:26px}.section-audio{width:100%}.closing-audio-card h2{font-size:28px}}