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components;@layer utilities{.relative{position:relative}.block{display:block}.flex{display:flex}.grid{display:grid}.inline-block{display:inline-block}.inline-flex{display:inline-flex}.inline-grid{display:inline-grid}.table{display:table}.border{border-style:var(--tw-border-style);border-width:1px}.uppercase{text-transform:uppercase}.outline{outline-style:var(--tw-outline-style);outline-width:1px}.filter{filter:var(--tw-blur,) var(--tw-brightness,) var(--tw-contrast,) var(--tw-grayscale,) var(--tw-hue-rotate,) var(--tw-invert,) var(--tw-saturate,) var(--tw-sepia,) var(--tw-drop-shadow,)}.transition{transition-property:color,background-color,border-color,outline-color,text-decoration-color,fill,stroke,--tw-gradient-from,--tw-gradient-via,--tw-gradient-to,opacity,box-shadow,transform,translate,scale,rotate,filter,-webkit-backdrop-filter,backdrop-filter,display,content-visibility,overlay,pointer-events;transition-timing-function:var(--tw-ease,var(--default-transition-timing-function));transition-duration:var(--tw-duration,var(--default-transition-duration))}}:root{--navy:#032d60;--navy-soft:#0b4f8a;--blue:#0176d3;--blue-bright:#1b96ff;--blue-50:#eaf5fe;--blue-100:#d6ecfb;--coral:#ee5a36;--coral-deep:#c9421f;--coral-50:#fff1ec;--coral-100:#ffe0d5;--ink:#16243a;--ink-2:#41566f;--ink-3:#6b7e94;--line:#e4e8ee;--line-2:#d6dde6;--bg:#f4f6f9;--card:#fff;--note-bg:#fef8e5;--note-border:#f6de8c;--note-ink:#6b5418;--green:#2e844a;--green-50:#ebf7ee;--slate:#2e5070;--r-sm:8px;--r:14px;--r-lg:22px;--r-xl:30px;--shadow-sm:0 1px 2px #032d600f, 0 2px 6px 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#0176d347}.btn-primary:hover{background:#0a66b8}.btn-coral{background:var(--coral);color:#fff;box-shadow:0 2px 12px #ee5a3652}.btn-coral:hover{background:var(--coral-deep)}.btn-ghost{color:var(--blue);border:1.5px solid var(--line-2);background:#fff}.btn-ghost:hover{border-color:var(--blue);background:var(--blue-50)}.btn-sm{padding:8px 16px;font-size:14px}.btn-lg{padding:15px 30px;font-size:17px}.pill{white-space:nowrap;background:var(--blue);color:#fff;border-radius:999px;align-items:center;gap:6px;padding:5px 12px;font-size:13px;font-weight:700;display:inline-flex}.pill-soft{background:var(--blue-50);color:var(--blue)}.pill-coral{background:var(--coral-50);color:var(--coral-deep)}.pill-gray{color:var(--ink-3);background:#eef1f5}.eyebrow{letter-spacing:.08em;text-transform:uppercase;color:var(--blue);font-size:13px;font-weight:700}.topbar{z-index:60;border-bottom:1px solid var(--line);background:#fff;position:sticky;top:0}#readbar{background:linear-gradient(90deg,var(--blue),var(--blue-bright));opacity:0;width:0;height:3px;transition:width .12s linear}#readbar.on{opacity:1}.topbar .row1{border-bottom:1px solid var(--line);align-items:center;gap:18px;height:62px;padding:0 28px;display:flex}.topbar .search{flex:1;max-width:620px;margin:0 auto;position:relative}.topbar .search input{border:1.5px solid var(--line-2);width:100%;height:42px;color:var(--ink);background:#fff;border-radius:999px;outline:none;padding:0 18px 0 44px;font-family:inherit;font-size:15px}.topbar .search input:focus{border-color:var(--blue);box-shadow:0 0 0 3px var(--blue-50)}.topbar .search svg{color:var(--ink-3);position:absolute;top:11px;left:15px}.cloud-logo{align-items:center;gap:10px;display:flex}.cloud-mark{background:var(--coral-50);border:1.5px solid var(--coral-100);border-radius:50%;place-items:center;width:42px;height:42px;display:grid}.user-chip{border:1.5px solid var(--line);background:#fff;border-radius:999px;flex-shrink:0;align-items:center;gap:9px;padding:4px 6px 4px 14px;display:flex}.user-chip .pts{color:var(--navy);white-space:nowrap;font-size:14px;font-weight:800}.user-chip .avatar{background:linear-gradient(135deg,var(--blue),var(--blue-bright));color:#fff;border-radius:50%;place-items:center;width:34px;height:34px;display:grid;overflow:hidden}.topbar .row2{align-items:center;gap:6px;height:54px;padding:0 28px;display:flex}.wordmark{color:var(--navy);letter-spacing:-.02em;white-space:nowrap;flex-shrink:0;align-items:baseline;gap:9px;margin-right:30px;font-size:24px;font-weight:800;display:flex}.wordmark .zh{color:var(--coral);letter-spacing:.02em;font-size:13px;font-weight:700}.navlink{color:var(--navy);border-radius:8px;align-items:center;padding:8px 13px;font-size:15.5px;font-weight:700;transition:background .12s,box-shadow .12s;display:inline-flex}.navlink:hover{background:var(--blue-50)}.navlink 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26px;display:flex}.track-badge{color:#fff;border-radius:18px;flex-shrink:0;place-items:center;width:60px;height:60px;font-weight:800;display:grid}.track-badge.t-start{background:linear-gradient(135deg,#0176d3,#1b96ff)}.track-badge.t-build{background:linear-gradient(135deg,#ee5a36,#ff8a5c)}.track-badge.t-purple{background:linear-gradient(135deg,#7b5bd9,#a084ee)}.track-badge.t-green{background:linear-gradient(135deg,#04844b,#2eaf5e)}.track-badge.t-amber{background:linear-gradient(135deg,#fe9339,#fbb829)}.track-badge.t-teal{background:linear-gradient(135deg,#0c7c8e,#1dbed2)}.track-badge.t-lib{background:linear-gradient(135deg,#22384f,#3c5c79)}.track-head .ti{flex:1}.track-head .ti .k{letter-spacing:.1em;text-transform:uppercase;color:var(--ink-3);font-size:12.5px;font-weight:800}.track-head .ti h3{color:var(--navy);margin-top:3px;font-size:21px;font-weight:800}.track-head .ti p{color:var(--ink-2);margin-top:4px;font-size:14.5px}.track-head .tstat{text-align:right;flex-shrink:0}.track-head .tstat .big{color:var(--navy);font-size:15px;font-weight:800}.track-head .tstat .sm{color:var(--ink-3);font-size:12.5px}.trail{align-items:stretch;gap:0;padding:26px 26px 28px;display:flex;overflow-x:auto}.node{text-align:center;flex-direction:column;flex:1;align-items:center;min-width:200px;padding:0 8px;display:flex;position:relative}.node .connector{background:var(--line-2);z-index:0;width:100%;height:3px;position:absolute;top:27px;left:-50%}.node.done .connector,.node.current .connector{background:var(--blue)}.node:first-child .connector{display:none}.node .dot{z-index:1;border:3px solid var(--line-2);width:54px;height:54px;color:var(--ink-3);background:#fff;border-radius:50%;place-items:center;font-size:17px;font-weight:800;transition:transform .15s;display:grid}.node.done .dot{background:var(--green);border-color:var(--green);color:#fff}.node.current .dot{background:var(--blue);border-color:var(--blue);color:#fff;box-shadow:0 0 0 6px var(--blue-50)}.node.locked 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solid var(--line);border-radius:var(--r);background:#fbfcfd;padding:20px;position:relative}.lib-card .ico{background:var(--blue-50);width:46px;height:46px;color:var(--blue);border-radius:12px;place-items:center;font-size:18px;font-weight:800;display:grid}.lib-card h4{color:var(--navy);margin-top:14px;font-size:16px;font-weight:800}.lib-card p{color:var(--ink-3);margin-top:5px;font-size:13.5px;line-height:1.5}.lib-card .soon{position:absolute;top:14px;right:14px}.crumb{color:var(--ink-3);flex-wrap:wrap;align-items:center;gap:8px;padding:16px 0 0;font-size:14px;font-weight:600;display:flex}.crumb a:hover{color:var(--blue)}.crumb .sep{color:var(--line-2)}.crumb .cur{color:var(--ink)}.lesson-grid{grid-template-columns:1fr 312px;align-items:start;gap:40px;padding:22px 0 80px;display:grid}.lesson-main{min-width:0}.lesson-title{color:var(--navy);letter-spacing:-.01em;font-size:34px;font-weight:800;line-height:1.25}.lesson-tags{flex-wrap:wrap;gap:10px;margin-top:16px;display:flex}.content{margin-top:14px}.content .sec{border-top:1px solid var(--line);padding:30px 0}.content .sec:first-child{border-top:none}.sec-num{align-items:center;gap:10px;margin-bottom:6px;display:inline-flex}.sec-num .badge{background:var(--navy);color:#fff;border-radius:50%;place-items:center;width:30px;height:30px;font-size:14px;font-weight:800;display:grid}.sec-num .lab{color:var(--ink-3);letter-spacing:.08em;text-transform:uppercase;white-space:nowrap;font-size:13px;font-weight:800}.content h3{color:var(--navy);margin:4px 0 14px;font-size:23px;font-weight:800;line-height:1.35}.content p{color:var(--ink-2);text-wrap:pretty;margin:0 0 14px;font-size:17px;line-height:1.85}.content p 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var(--line);border-radius:var(--r);background:#fff;align-items:flex-start;gap:16px;padding:18px 20px;display:flex}.bd-item .n{background:var(--coral-50);width:34px;height:34px;color:var(--coral-deep);border-radius:10px;flex-shrink:0;place-items:center;font-weight:800;display:grid}.bd-item h5{color:var(--navy);font-size:16.5px;font-weight:800}.bd-item p{color:var(--ink-2);margin:5px 0 0;font-size:15px;line-height:1.65}.statement{text-align:center;border:2px dashed var(--coral-100);border-radius:var(--r-lg);background:#fff;margin:6px 0;padding:40px 30px}.statement .big{color:var(--navy);font-size:30px;font-weight:800;line-height:1.4}.statement .big em{color:var(--coral);background:linear-gradient(transparent 60%,var(--coral-100) 60%);font-style:normal}.mentor{background:var(--coral-50);border:1.5px solid var(--coral-100);border-left:5px solid var(--coral);border-radius:var(--r);align-items:flex-start;gap:16px;margin:6px 0;padding:20px 22px 20px 20px;display:flex}.mentor 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