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 * Copyright (c) 2014, Jason Chen
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h1{font-size:2rem;line-height:1.15}.admin-header-actions{display:flex;gap:12px;flex-wrap:wrap}.admin-metrics-grid{display:grid;gap:16px;grid-template-columns:repeat(auto-fit,minmax(160px,1fr))}.metric-card{padding:18px;border-radius:16px;background:linear-gradient(140deg,#ffffff0f,#ffffff05);border:1px solid var(--line)}.filter-summary{display:grid;gap:6px;color:var(--muted);font-size:.95rem}.admin-overlay{position:fixed;top:0;right:0;bottom:0;left:0;background:#00000059;border:none;z-index:20}.admin-menu-toggle{display:none}.student-shell{display:flex;min-height:100%;font-size:1rem}.student-sidebar{width:240px;background:linear-gradient(180deg,#161a26f5,#0f111af5);border-right:1px solid var(--line);padding:24px 18px;display:flex;flex-direction:column;gap:24px}.student-brand{display:flex;flex-direction:column;gap:4px}.student-nav{display:flex;flex-direction:column;gap:8px}.student-nav a{color:var(--ink);display:flex;align-items:center;gap:10px;padding:10px 12px;border-radius:12px;font-weight:600}.student-nav a.active{background:var(--panel-muted)}.student-workspace{flex:1;min-width:0;background:var(--page-bg);position:relative;overflow:hidden}.student-topbar{display:none;align-items:center;gap:12px;padding:16px clamp(16px,4vw,40px);border-bottom:1px solid var(--line);background:#0a0a0ecc;-webkit-backdrop-filter:blur(12px);backdrop-filter:blur(12px)}.student-profile-chip{margin-left:auto;border:1px solid var(--line);border-radius:999px;padding:6px 12px;display:flex;align-items:center;gap:10px;background:var(--panel);font-size:.9rem}.student-profile-card{border:1px solid var(--line);border-radius:14px;padding:12px;background:var(--panel);display:grid;gap:4px;font-size:.95rem}.student-profile-card span,.student-profile-chip span{color:var(--muted);font-size:.8rem}.student-content{padding:clamp(28px,5vw,60px) clamp(16px,4vw,40px);position:relative;z-index:1}.admin-workspace:before,.student-workspace:before{content:"";position:absolute;top:0;right:0;bottom:0;left:0;background:radial-gradient(55% 70% at 15% 10%,rgba(120,140,255,.16),transparent 60%),radial-gradient(45% 55% at 90% 0%,rgba(255,182,213,.12),transparent 60%);opacity:.7;pointer-events:none;z-index:0}.student-page{display:grid;gap:24px}.student-panel{border:1px solid var(--line);border-radius:16px;padding:clamp(16px,3vw,24px);background:linear-gradient(140deg,#ffffff0d,#ffffff05);display:grid;gap:16px}.student-page-header{display:flex;justify-content:space-between;align-items:center;gap:18px;flex-wrap:wrap}.student-page-header h1{font-size:2rem;line-height:1.15}.student-metrics-grid{display:grid;gap:16px;grid-template-columns:repeat(auto-fit,minmax(160px,1fr))}.student-overlay{position:fixed;top:0;right:0;bottom:0;left:0;background:#00000059;border:none;z-index:20}.student-menu-toggle{display:none}@media (max-width: 1024px){.student-sidebar{position:fixed;top:0;bottom:0;left:0;transform:translate(-100%);transition:transform .2s ease;z-index:30}.student-sidebar.open{transform:translate(0)}.student-topbar{display:flex}.student-menu-toggle{display:inline-flex}}@media (max-width: 1024px){.admin-sidebar{position:fixed;top:0;bottom:0;left:0;transform:translate(-100%);transition:transform .2s ease;z-index:30}.admin-sidebar.open{transform:translate(0)}.admin-topbar{display:flex}.admin-menu-toggle{display:inline-flex}}.site-header{background:#0a0a0ea6;-webkit-backdrop-filter:blur(14px);backdrop-filter:blur(14px);border-bottom:1px solid rgba(255,255,255,.08);position:sticky;top:0;z-index:10}.header-inner{display:flex;align-items:center;justify-content:space-between;padding:18px 0;gap:24px}.header-actions{display:flex;align-items:center;gap:12px}.header-auth-button{min-height:42px;min-width:102px;padding:0 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ease}.icon-button:hover{transform:translateY(-2px);box-shadow:0 8px 18px #00000014}.icon-button svg{width:18px;height:18px}.logo{font-family:var(--font-display);font-size:1.1rem;font-weight:600;letter-spacing:.04em;display:inline-flex;align-items:center;gap:10px;color:var(--ink);text-decoration:none}.logo-image{width:34px;height:34px;border-radius:10px;object-fit:cover;border:1px solid rgba(255,255,255,.15);display:block}.nav{display:flex;gap:18px;font-size:.95rem}.nav a{color:var(--ink-soft)}.nav a.active{color:var(--ink);font-weight:600}.site-footer{border-top:1px solid var(--line);background:#0a0a0ecc;-webkit-backdrop-filter:blur(12px);backdrop-filter:blur(12px)}.footer-inner{display:flex;justify-content:space-between;align-items:center;padding:24px 0;gap:16px;flex-wrap:wrap}.footer-brand{font-family:var(--font-display);font-size:1.1rem}.footer-links{display:flex;gap:10px;align-items:center;color:var(--muted)}.button{display:inline-flex;align-items:center;justify-content:center;padding:11px 20px;border-radius:999px;font-weight:600;border:1px solid var(--line);background:var(--panel);color:var(--ink);transition:border-color .2s ease,background .2s ease,box-shadow .2s ease,transform .2s ease}.button:focus-visible{outline:none;box-shadow:0 0 0 3px var(--focus)}.button-solid{background:#f5f6f8;color:#12131a;border-color:#ffffffb3;box-shadow:0 12px 26px #0006}.button-solid.danger{background:#b00020;border-color:#b00020}.button-outline{background:transparent;color:var(--ink);border-color:var(--line)}.button-ghost{border-color:transparent;color:var(--muted);background:transparent}.button:hover{border-color:var(--ink);transform:translateY(-1px)}.button-solid:hover{background:var(--panel)}.button-outline:hover{background:#ffffff14}.button[disabled]{opacity:.6;cursor:not-allowed;box-shadow:none}.button-sm{padding:8px 14px;font-size:var(--text-sm)}.button-lg{padding:14px 26px;font-size:1rem}.hero{display:grid;grid-template-columns:repeat(auto-fit,minmax(280px,1fr));gap:40px;align-items:center}.hero-modern{grid-template-columns:1fr;justify-items:center;text-align:center;padding:clamp(32px,8vw,80px) 0}.hero-modern .hero-copy{max-width:640px}@media (min-width: 960px){.hero-modern{text-align:left;justify-items:start}.hero-modern 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h2{font-family:var(--font-sans);font-size:1.4rem;font-weight:600}.course-hero-image{width:100%;max-height:280px;object-fit:cover;border-radius:16px;border:1px solid var(--line);margin:16px 0}.course-header{display:grid;gap:24px;grid-template-columns:minmax(0,1.4fr) minmax(0,1fr);align-items:start}.course-hero{display:grid;gap:12px}.course-price{font-size:1.1rem;font-weight:700;margin-top:4px}.course-summary{line-height:1.7;max-width:720px;margin-top:8px}.course-outline{margin-top:2.5rem}.outline-stack{display:grid;gap:.75rem;margin-top:1rem}.outline-heading{font-size:1.2rem;margin-top:.5rem}.outline-subheading{font-size:1.05rem;font-weight:600;margin-top:.25rem}.outline-bullet{margin:0;padding-left:1.25rem;position:relative;color:var(--muted)}.outline-bullet:before{content:"•";position:absolute;left:0;color:var(--ink)}.course-meta-panel{display:grid;gap:16px;padding:18px;border-radius:18px;border:1px solid var(--line);background:#ffffff0a}.course-meta-item h3{margin:0 0 6px;font-size:.95rem}.course-meta-actions{display:grid;gap:10px}.course-details{margin-top:32px;display:grid;gap:20px;grid-template-columns:repeat(auto-fit,minmax(240px,1fr))}.prereq-list{margin:12px 0 0;padding-left:18px;color:var(--muted);display:grid;gap:6px}.project-layout{display:grid;grid-template-columns:minmax(180px,.7fr) minmax(0,2fr);gap:16px;margin-top:18px}.project-sidebar{display:flex;flex-direction:column;gap:8px;border-right:1px solid var(--line);padding-right:12px}.project-link{background:transparent;border:none;text-align:left;padding:8px 10px;border-radius:10px;font-weight:600;color:var(--muted);cursor:pointer}.project-link.active{color:var(--ink);background:var(--panel-muted)}.project-content{display:grid;gap:12px}@media (max-width: 900px){.project-layout{grid-template-columns:1fr}.project-sidebar{border-right:none;border-bottom:1px solid var(--line);padding-right:0;padding-bottom:12px;flex-direction:row;overflow-x:auto}.project-link{white-space:nowrap}}.hero-stats{display:flex;justify-content:space-between;margin:24px 0}.stat{font-weight:700;font-size:1.2rem}.eyebrow{letter-spacing:.2em;text-transform:uppercase;font-size:.75rem;color:var(--muted);margin-bottom:10px}.muted{color:var(--muted);line-height:1.6}.split-section{margin-top:70px;display:grid;gap:32px;grid-template-columns:repeat(auto-fit,minmax(260px,1fr))}.feature-grid{display:grid;gap:20px;grid-template-columns:repeat(auto-fit,minmax(200px,1fr))}.feature{border:1px solid var(--line);border-radius:16px;padding:20px;background:var(--panel)}.callout{margin-top:70px;padding:40px;background:linear-gradient(135deg,#141824eb,#1e1a2deb);color:var(--ink);border-radius:28px;text-align:center;border:1px solid rgba(255,255,255,.08);box-shadow:0 20px 50px #00000059}.callout .muted{color:var(--muted);margin:12px 0 22px}.faq{margin-top:70px}.faq-grid{display:grid;gap:20px;margin-top:20px;grid-template-columns:repeat(auto-fit,minmax(220px,1fr))}.testimonials{margin-top:70px}.testimonial-grid{display:grid;gap:20px;margin-top:20px;grid-template-columns:repeat(auto-fit,minmax(240px,1fr))}.testimonial{border:1px solid var(--line);border-radius:16px;padding:22px;background:var(--panel);box-shadow:0 14px 30px var(--shadow);display:grid;gap:12px}.page-header{margin-bottom:32px}.course-grid{display:grid;gap:24px;grid-template-columns:repeat(auto-fit,minmax(240px,1fr))}.course-card{background:var(--panel);border:1px solid var(--line);border-radius:16px;padding:20px;display:flex;flex-direction:column;gap:14px;box-shadow:0 12px 24px var(--shadow)}.course-image{width:100%;height:160px;object-fit:cover;border-radius:14px;border:1px solid var(--line)}.course-tag{font-size:.75rem;letter-spacing:.2em;text-transform:uppercase;color:var(--muted)}.course-price{font-size:.95rem;font-weight:700;color:var(--ink)}.course-meta{display:flex;flex-wrap:wrap;gap:10px;font-size:.85rem;color:var(--muted)}.course-meta span{padding:6px 10px;border-radius:999px;border:1px solid var(--line);background:var(--panel)}.course-callout{background:var(--panel-muted);border:1px dashed var(--line);border-radius:14px;padding:14px 18px;color:var(--muted)}.info-banner{display:flex;align-items:center;justify-content:space-between;gap:16px;padding:14px 18px;border-radius:14px;border:1px solid var(--line);background:#ffffff0a;margin-bottom:20px}.feedback-banner{border-color:#2e7d3240;background:#e9f6ec}.success-banner{border-color:#4caf5073;background:#4caf5029;color:#dff4e0}.success-banner .button-ghost{color:#dff4e0}.success-banner 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li{display:flex;align-items:center;justify-content:space-between;gap:12px;font-size:.95rem}.book-card{display:grid;grid-template-columns:minmax(160px,220px) minmax(0,1fr);gap:18px;padding:18px;border-radius:16px;border:1px solid var(--line);background:var(--panel);box-shadow:0 12px 24px var(--shadow)}.book-cover img,.book-placeholder{width:100%;height:100%;min-height:160px;object-fit:cover;border-radius:12px;border:1px solid var(--line);background:var(--panel-muted);display:flex;align-items:center;justify-content:center;color:var(--muted);font-weight:600}.book-body{display:grid;gap:12px}.book-header{display:flex;justify-content:space-between;align-items:flex-start;gap:12px}.book-actions{display:flex;flex-wrap:wrap;gap:12px;align-items:center}@media (max-width: 720px){.book-card,.book-grid,.book-store{grid-template-columns:1fr}.book-cart{position:static}.header-auth-button{min-width:88px;padding:0 16px;font-size:.95rem}}@media (min-width: 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