/* ============================================================= * Agentic System Design — course landing + lecture pages * Topbar = home-site (S logo + sunnytiwari.com). * Brand = full-bleed banner with architecture-diagram SVG. * Sidebar collapses to a 48px rail (desktop) / 40px (mobile). * Light + dark themes via [data-theme] on . * ============================================================= */ /* ─── Theme: dark (default) ───────────────────────────────── */ :root, :root[data-theme="dark"] { --bg-deep: #0A0A0E; --bg-surface: #14141B; --bg-elevated: #1B1B23; --bg-glass: rgba(20, 20, 27, 0.7); --bg-sidebar: #0E0E14; --bg-canvas-opacity: 0.4; --border: rgba(255, 255, 255, 0.08); --border-strong: rgba(255, 255, 255, 0.14); --text: #F5F7FA; --text-soft: #C2C8D2; --text-muted: #6B7280; --text-faint: #4A5160; --neon-cyan: #00E5FF; --neon-cyan-dim: rgba(0, 229, 255, 0.18); --neon-cyan-glow: rgba(0, 229, 255, 0.35); --neon-purple: #A855F7; --neon-purple-dim:rgba(168, 85, 247, 0.18); --neon-green: #39FF14; --neon-green-dim: rgba(57, 255, 20, 0.18); --neon-amber: #FFB800; --neon-amber-dim: rgba(255, 184, 0, 0.18); --neon-pink: #FF2D78; --neon-pink-dim: rgba(255, 45, 120, 0.18); --brand-gradient: linear-gradient(135deg, #FFFFFF 0%, #00E5FF 55%, #A855F7 100%); --banner-bg: linear-gradient(135deg, #1B1B23 0%, #14141B 70%); } /* ─── Theme: light ────────────────────────────────────────── */ :root[data-theme="light"] { --bg-deep: #F8F9FB; --bg-surface: #F1F3F6; --bg-elevated: #FFFFFF; --bg-glass: rgba(255, 255, 255, 0.78); --bg-sidebar: #F1F3F6; --bg-canvas-opacity: 0.18; --border: rgba(15, 17, 21, 0.09); --border-strong: rgba(15, 17, 21, 0.16); --text: #0F1115; --text-soft: #2D3038; --text-muted: #5D6470; --text-faint: #8E939C; --neon-cyan: #008CB3; --neon-cyan-dim: rgba(0, 140, 179, 0.15); --neon-cyan-glow: rgba(0, 140, 179, 0.3); --neon-purple: #7B2FE0; --neon-purple-dim:rgba(123, 47, 224, 0.15); --neon-green: #168F08; --neon-green-dim: rgba(22, 143, 8, 0.16); --neon-amber: #B57A00; --neon-amber-dim: rgba(181, 122, 0, 0.16); --neon-pink: #C7124C; --neon-pink-dim: rgba(199, 18, 76, 0.16); --brand-gradient: linear-gradient(135deg, #0F1115 0%, #008CB3 55%, #7B2FE0 100%); --banner-bg: linear-gradient(135deg, #FFFFFF 0%, #F1F3F6 70%); } * { box-sizing: border-box; margin: 0; padding: 0; } :root { --font-body: 'Outfit', -apple-system, BlinkMacSystemFont, sans-serif; --font-mono: 'Fira Code', 'SF Mono', Menlo, monospace; --sidebar-w: 280px; --sidebar-rail: 48px; --topbar-h: 58px; --content-max: 920px; } /* Base font bump */ html { font-size: 17px; } html, body { background: var(--bg-deep); color: var(--text); font-family: var(--font-body); font-weight: 400; -webkit-font-smoothing: antialiased; height: 100vh; overflow: hidden; transition: background-color 0.25s ease, color 0.25s ease; } body { display: flex; flex-direction: column; } ::-webkit-scrollbar { width: 8px; height: 8px; } ::-webkit-scrollbar-track { background: transparent; } ::-webkit-scrollbar-thumb { background: var(--border-strong); border-radius: 4px; } ::-webkit-scrollbar-thumb:hover { background: var(--neon-cyan-dim); } a { color: var(--neon-cyan); text-decoration: none; } #bg-canvas { position: fixed; inset: 0; z-index: 0; pointer-events: none; opacity: var(--bg-canvas-opacity); transition: opacity 0.25s ease; } /* ─── Topbar — exact home-site pattern ────────────────────── */ .topbrand { flex-shrink: 0; height: var(--topbar-h); z-index: 30; backdrop-filter: blur(14px); -webkit-backdrop-filter: blur(14px); background: var(--bg-glass); border-bottom: 1px solid var(--border); } .topbrand-inner { height: 100%; display: flex; align-items: center; justify-content: space-between; gap: 1rem; padding: 0 1.5rem; max-width: 1280px; margin: 0 auto; } .topbrand .logo { display: flex; align-items: center; gap: 0.6rem; text-decoration: none; color: inherit; } .topbrand .logo-mark { width: 32px; height: 32px; border-radius: 9px; background: linear-gradient(135deg, var(--neon-cyan) 0%, var(--neon-purple) 100%); display: grid; place-items: center; font-family: var(--font-body); font-weight: 800; font-size: 0.88rem; color: #0A0A0E; box-shadow: 0 0 18px var(--neon-cyan-dim); } .topbrand .logo-text { font-family: var(--font-mono); font-size: 0.84rem; font-weight: 500; color: var(--text-soft); letter-spacing: 0.05em; } .topbrand .logo-text .accent { color: var(--neon-cyan); font-weight: 600; } .theme-toggle { background: transparent; border: 1px solid var(--border); border-radius: 8px; padding: 0.42rem 0.55rem; color: var(--text-muted); cursor: pointer; display: inline-flex; align-items: center; justify-content: center; transition: all 0.18s ease; } .theme-toggle:hover { color: var(--neon-cyan); border-color: var(--neon-cyan-dim); } .theme-toggle .icon-sun, .theme-toggle .icon-moon { display: none; } :root[data-theme="dark"] .theme-toggle .icon-sun { display: block; } :root[data-theme="light"] .theme-toggle .icon-moon { display: block; } /* ─── App grid ────────────────────────────────────────────── */ .app { position: relative; z-index: 1; flex: 1; display: grid; grid-template-columns: var(--sidebar-w) 1fr; min-height: 0; overflow: hidden; transition: grid-template-columns 0.25s ease; } .app.sb-collapsed { grid-template-columns: var(--sidebar-rail) 1fr; } /* ─── Sidebar (default = expanded) ─────────────────────────── */ .sidebar { background: var(--bg-sidebar); border-right: 1px solid var(--border); display: flex; flex-direction: column; height: 100%; overflow: hidden; transition: width 0.25s ease; position: relative; } /* Brand block */ .sb-brand { display: flex; align-items: center; justify-content: space-between; gap: 0.5rem; padding: 1rem 0.85rem 1rem 1.1rem; border-bottom: 1px solid var(--border); flex-shrink: 0; min-height: 56px; } .sb-brand-link { font-size: 1rem; font-weight: 700; letter-spacing: -0.01em; color: var(--text); text-decoration: none; line-height: 1.2; white-space: nowrap; overflow: hidden; text-overflow: ellipsis; } .sb-brand-link:hover { color: var(--neon-cyan); } .sb-toggle { flex-shrink: 0; background: transparent; border: 1px solid var(--border); border-radius: 7px; padding: 0.32rem 0.45rem; color: var(--text-muted); cursor: pointer; display: inline-flex; align-items: center; justify-content: center; transition: all 0.18s ease; } .sb-toggle:hover { color: var(--neon-cyan); border-color: var(--neon-cyan-dim); } .sb-toggle svg { transition: transform 0.3s ease; } .app.sb-collapsed .sb-toggle svg { transform: rotate(180deg); } /* When collapsed: hide everything except the toggle in sb-brand */ .app.sb-collapsed .sb-brand-link, .app.sb-collapsed .sb-progress, .app.sb-collapsed .sb-nav, .app.sb-collapsed .sb-footer { display: none; } .app.sb-collapsed .sb-brand { justify-content: center; padding: 1rem 0.5rem; } .app.sb-collapsed .sidebar { border-right: 1px solid var(--border-strong); } /* ─── Sidebar progress ────────────────────────────────────── */ .sb-progress { position: relative; padding: 0.95rem 1.1rem; border-bottom: 1px solid var(--border); flex-shrink: 0; } .sb-progress-row { display: flex; justify-content: space-between; align-items: center; margin-bottom: 0.55rem; font-family: var(--font-mono); font-size: 0.7rem; letter-spacing: 0.08em; text-transform: uppercase; } .sb-progress-label { display: inline-flex; align-items: center; gap: 0.4rem; color: var(--text-faint); } .sb-progress-text { color: var(--text-soft); } .sb-progress-info { display: inline-grid; place-items: center; width: 15px; height: 15px; border-radius: 50%; background: var(--neon-amber); color: #0A0A0E; font-family: var(--font-body); font-size: 0.66rem; font-weight: 800; border: none; cursor: pointer; transition: transform 0.18s ease; letter-spacing: 0; } .sb-progress-info:hover { transform: scale(1.12); } .sb-progress-bar { height: 6px; background: var(--bg-elevated); border-radius: 999px; overflow: hidden; border: 1px solid var(--border); } .sb-progress-fill { height: 100%; width: 0%; background: linear-gradient(90deg, var(--neon-cyan) 0%, var(--neon-purple) 100%); transition: width 0.4s ease; box-shadow: 0 0 10px var(--neon-cyan-glow); } .sb-progress-tooltip { display: none; margin-top: 0.7rem; padding: 0.7rem 0.85rem; background: var(--neon-amber-dim); border: 1px solid var(--neon-amber-dim); border-radius: 7px; font-size: 0.78rem; color: var(--text-soft); line-height: 1.5; } .sb-progress-tooltip strong { color: var(--neon-amber); font-weight: 600; } .sb-progress.tooltip-open .sb-progress-tooltip { display: block; } /* ─── Sidebar nav ─────────────────────────────────────────── */ .sb-nav { flex: 1; overflow-y: auto; overscroll-behavior: contain; padding: 0.8rem 0.6rem 1rem; } .sb-section { margin-bottom: 0.5rem; } .sb-section-label { font-family: var(--font-mono); font-size: 0.64rem; font-weight: 600; color: var(--text-faint); letter-spacing: 0.16em; text-transform: uppercase; padding: 0.55rem 0.7rem 0.45rem; line-height: 1.45; } .sb-section-label .label-name { color: var(--neon-purple); font-weight: 700; } .sb-part-divider { height: 1px; background: linear-gradient(90deg, transparent 0%, var(--border-strong) 25%, var(--border-strong) 75%, transparent 100%); margin: 0.85rem 0.5rem; } .sb-chapter-divider { height: 1px; background: var(--border); margin: 0.15rem 1.1rem; opacity: 0.55; } .sb-chapter-head { width: 100%; display: flex; align-items: center; gap: 0.6rem; background: transparent; border: 1px solid transparent; border-radius: 8px; padding: 0.6rem 0.7rem; color: var(--text-soft); font-family: inherit; font-size: 0.9rem; font-weight: 500; text-align: left; cursor: pointer; transition: all 0.15s ease; } .sb-chapter-head:hover { background: var(--neon-cyan-dim); color: var(--text); } .sb-chapter.locked .sb-chapter-head { cursor: default; color: var(--text-faint); } .sb-chapter.locked .sb-chapter-head:hover { background: transparent; } .sb-chapter.active > .sb-chapter-head { background: var(--neon-cyan-dim); border-color: var(--neon-cyan-dim); color: var(--text); } .sb-chapter-num { font-family: var(--font-mono); font-size: 0.78rem; color: var(--text-muted); flex-shrink: 0; min-width: 22px; text-align: center; font-weight: 600; } .sb-chapter.active .sb-chapter-num { color: var(--neon-cyan); } .sb-chapter-title { flex: 1; line-height: 1.3; font-size: 0.88rem; font-weight: 500; } .sb-chapter-icon { font-size: 0.82rem; color: var(--text-faint); flex-shrink: 0; transition: transform 0.2s ease; width: 14px; text-align: center; } .sb-chapter.locked .sb-chapter-icon { color: var(--text-faint); font-size: 0.74rem; } .sb-chapter.open > .sb-chapter-head .sb-chapter-icon { transform: rotate(90deg); color: var(--neon-cyan); } .sb-chapter-body { display: none; margin: 0.2rem 0 0.55rem 1.4rem; padding-left: 0.55rem; border-left: 1px dashed var(--border); } .sb-chapter.open > .sb-chapter-body { display: block; } .sb-lecture { display: flex; align-items: center; gap: 0.55rem; padding: 0.45rem 0.55rem; border-radius: 6px; text-decoration: none; color: var(--text-soft); font-size: 0.84rem; font-weight: 400; transition: all 0.15s ease; line-height: 1.3; } .sb-lecture:hover { background: var(--neon-cyan-dim); color: var(--text); } .sb-lecture.current { background: var(--neon-purple-dim); color: var(--text); font-weight: 500; } .sb-lec-icon { width: 19px; height: 19px; border-radius: 5px; display: grid; place-items: center; font-size: 0.68rem; background: var(--bg-elevated); border: 1px solid var(--border); color: var(--text-muted); flex-shrink: 0; } .sb-lecture.live .sb-lec-icon { background: var(--neon-cyan-dim); border-color: var(--neon-cyan-dim); color: var(--neon-cyan); } .sb-lecture.watched .sb-lec-icon { background: var(--neon-green-dim); border-color: var(--neon-green-dim); color: var(--neon-green); } .sb-lec-num { font-family: var(--font-mono); font-size: 0.7rem; color: var(--text-muted); flex-shrink: 0; letter-spacing: 0.04em; width: 30px; font-weight: 600; } .sb-lecture.current .sb-lec-num, .sb-lecture.watched .sb-lec-num { color: var(--text-soft); } .sb-lec-title { flex: 1; } .sb-footer { padding: 0.85rem 1.1rem 1rem; border-top: 1px solid var(--border); display: flex; gap: 0.5rem; flex-wrap: wrap; flex-shrink: 0; font-family: var(--font-mono); font-size: 0.7rem; letter-spacing: 0.08em; text-transform: uppercase; } .sb-footer a { color: var(--text-muted); text-decoration: none; padding: 0.38rem 0.6rem; border-radius: 6px; border: 1px solid var(--border); transition: all 0.15s ease; } .sb-footer a:hover { color: var(--neon-cyan); border-color: var(--neon-cyan-dim); } .scrim { display: none; } /* ─── Main content ────────────────────────────────────────── */ .main { height: 100%; overflow-y: auto; scroll-behavior: smooth; padding: 0 0 4rem; } .content { max-width: var(--content-max); margin: 0 auto; padding: 2rem 1.5rem 0; } .content-no-banner { max-width: var(--content-max); margin: 0 auto; padding: 1.75rem 1.5rem 0; } /* ============================================================ * BANNER (full-bleed, sleek) — brand identity hero * ============================================================ */ .banner { position: relative; width: 100%; background: var(--banner-bg); border-bottom: 1px solid var(--border); overflow: hidden; isolation: isolate; } .banner::before { content: ""; position: absolute; top: -160px; right: -120px; width: 480px; height: 480px; border-radius: 50%; background: radial-gradient(circle at center, rgba(0, 229, 255, 0.16) 0%, rgba(168, 85, 247, 0.08) 45%, transparent 75%); pointer-events: none; z-index: 0; } .banner::after { content: ""; position: absolute; bottom: -120px; left: -100px; width: 320px; height: 320px; border-radius: 50%; background: radial-gradient(circle at center, rgba(168, 85, 247, 0.14) 0%, transparent 70%); pointer-events: none; z-index: 0; } :root[data-theme="light"] .banner::before { background: radial-gradient(circle at center, rgba(0, 140, 179, 0.14) 0%, rgba(123, 47, 224, 0.08) 45%, transparent 75%); } :root[data-theme="light"] .banner::after { background: radial-gradient(circle at center, rgba(123, 47, 224, 0.12) 0%, transparent 70%); } .banner-grid { position: relative; z-index: 1; max-width: 1100px; margin: 0 auto; padding: 2.6rem 1.75rem 2.6rem; display: grid; grid-template-columns: 1fr 340px; gap: 2.25rem; align-items: center; } .banner-text { min-width: 0; } .banner .eyebrow { font-family: var(--font-mono); font-size: 0.74rem; letter-spacing: 0.22em; text-transform: uppercase; color: var(--neon-cyan); margin-bottom: 1.1rem; } .banner-title { font-size: clamp(2.2rem, 4.6vw, 3.2rem); font-weight: 800; letter-spacing: -0.022em; line-height: 1.18; padding-bottom: 0.08em; background: var(--brand-gradient); -webkit-background-clip: text; -webkit-text-fill-color: transparent; background-clip: text; margin-bottom: 1rem; white-space: nowrap; } .banner-sub { font-size: 1.15rem; color: var(--text-soft); line-height: 1.5; margin-bottom: 1.6rem; max-width: 540px; } .banner-meta { display: flex; flex-wrap: wrap; align-items: center; gap: 0.7rem; margin-bottom: 1.5rem; font-family: var(--font-mono); font-size: 0.86rem; color: var(--text-muted); } .banner-meta .meta-item { display: inline-flex; align-items: center; gap: 0.55rem; padding: 0.5rem 0.9rem; background: var(--bg-elevated); border: 1px solid var(--border); border-radius: 9px; transition: border-color 0.18s ease; } .banner-meta .meta-item:hover { border-color: var(--neon-cyan-dim); } .banner-meta .meta-icon { width: 16px; height: 16px; color: var(--neon-cyan); flex-shrink: 0; } .banner-meta .meta-val { color: var(--text); font-weight: 700; font-family: var(--font-body); font-size: 1.04rem; letter-spacing: -0.01em; } .banner-meta .meta-val span { color: var(--neon-cyan); } .banner-meta .meta-label { color: var(--text-muted); letter-spacing: 0.05em; font-size: 0.82rem; } .cta-row { display: flex; flex-wrap: wrap; gap: 0.7rem; } .btn { display: inline-flex; align-items: center; gap: 0.5rem; font-family: var(--font-body); font-size: 0.95rem; font-weight: 600; padding: 0.78rem 1.4rem; border-radius: 10px; cursor: pointer; text-decoration: none; border: 1px solid var(--border); color: var(--text); transition: all 0.18s ease; } .btn.primary { background: linear-gradient(135deg, var(--neon-cyan-dim) 0%, var(--neon-purple-dim) 100%); border-color: var(--neon-cyan); box-shadow: 0 4px 16px var(--neon-cyan-dim); } .btn.primary:hover { transform: translateY(-1px); box-shadow: 0 6px 22px var(--neon-cyan-glow); } .btn.ghost { background: transparent; color: var(--text-soft); } .btn.ghost:hover { border-color: var(--neon-cyan-dim); color: var(--neon-cyan); } /* ─── Banner SVG art ──────────────────────────────────────── */ .banner-art-wrap { position: relative; width: 100%; max-width: 340px; justify-self: end; } .banner-art { width: 100%; height: auto; display: block; filter: drop-shadow(0 0 36px rgba(0, 229, 255, 0.22)); } :root[data-theme="light"] .banner-art { filter: drop-shadow(0 0 22px rgba(0, 140, 179, 0.18)); } /* ─── Section heading ─────────────────────────────────────── */ .section-title { font-size: 1.5rem; font-weight: 700; letter-spacing: -0.01em; margin-bottom: 0.4rem; } .section-tagline { font-family: var(--font-mono); font-size: 0.78rem; color: var(--text-muted); margin-bottom: 1.5rem; letter-spacing: 0.04em; } /* ─── Curriculum (main) ───────────────────────────────────── */ .part { margin-bottom: 2.5rem; } .part-header { display: flex; align-items: baseline; gap: 0.85rem; margin-bottom: 0.4rem; padding-bottom: 0.55rem; border-bottom: 1px solid var(--border); } .part-label { font-family: var(--font-mono); font-size: 0.74rem; letter-spacing: 0.18em; text-transform: uppercase; color: var(--neon-purple); font-weight: 700; } .part-title { font-size: 1.25rem; font-weight: 700; letter-spacing: -0.01em; } .part-blurb { font-size: 0.92rem; color: var(--text-muted); line-height: 1.5; margin-bottom: 1.1rem; } .chapter { background: var(--bg-glass); backdrop-filter: blur(12px); -webkit-backdrop-filter: blur(12px); border: 1px solid var(--border-strong); border-radius: 12px; margin-bottom: 0.9rem; overflow: hidden; transition: border-color 0.2s ease; } .chapter:hover { border-color: var(--neon-cyan-dim); } .chapter.locked { opacity: 0.62; } .chapter.locked:hover { border-color: var(--border-strong); } .chapter-head { display: flex; align-items: center; gap: 1rem; padding: 1rem 1.15rem; } .chapter-num { flex-shrink: 0; width: 40px; height: 40px; border-radius: 10px; background: var(--bg-elevated); border: 1px solid var(--border); display: grid; place-items: center; font-family: var(--font-mono); font-size: 0.9rem; font-weight: 700; color: var(--text-soft); } .chapter.has-live .chapter-num { border-color: var(--neon-cyan-dim); color: var(--neon-cyan); box-shadow: 0 0 10px var(--neon-cyan-dim); } .chapter-meta { flex: 1; min-width: 0; } .chapter-title { font-size: 1.1rem; font-weight: 700; letter-spacing: -0.01em; color: var(--text); line-height: 1.25; margin-bottom: 0.22rem; } .chapter.locked .chapter-title { color: var(--text-soft); } .chapter-desc { font-size: 0.92rem; color: var(--text-muted); line-height: 1.45; } .chapter-status { flex-shrink: 0; display: flex; align-items: center; gap: 0.5rem; } .chapter-lock { width: 34px; height: 34px; border-radius: 9px; background: var(--bg-elevated); border: 1px solid var(--border); display: grid; place-items: center; color: var(--text-faint); font-size: 1rem; } .chapter-body { padding: 0 1.15rem 1rem; border-top: 1px solid var(--border); } .lecture-list { list-style: none; display: flex; flex-direction: column; gap: 0.32rem; margin-top: 0.8rem; } .lecture { display: flex; align-items: center; gap: 0.7rem; padding: 0.66rem 0.75rem; border-radius: 8px; background: rgba(255, 255, 255, 0.012); border: 1px solid transparent; transition: all 0.15s ease; text-decoration: none; color: inherit; } .lecture.live:hover { background: var(--neon-cyan-dim); border-color: var(--neon-cyan-dim); } .lecture.live.watched { background: var(--neon-green-dim); } .lec-status { flex-shrink: 0; width: 26px; height: 26px; border-radius: 6px; display: grid; place-items: center; font-size: 0.84rem; background: var(--neon-cyan-dim); border: 1px solid var(--neon-cyan-dim); color: var(--neon-cyan); } .lecture.live.watched .lec-status { background: var(--neon-green-dim); border-color: var(--neon-green-dim); color: var(--neon-green); } .lec-num { font-family: var(--font-mono); font-size: 0.78rem; color: var(--text-muted); flex-shrink: 0; letter-spacing: 0.04em; width: 36px; font-weight: 600; } .lec-title { flex: 1; font-size: 0.98rem; font-weight: 500; color: var(--text); line-height: 1.35; } .lec-pill { font-family: var(--font-mono); font-size: 0.62rem; letter-spacing: 0.1em; text-transform: uppercase; padding: 0.22rem 0.6rem; border-radius: 999px; background: var(--bg-elevated); border: 1px solid var(--border); color: var(--text-muted); flex-shrink: 0; } .lecture.live .lec-pill { color: var(--neon-cyan); border-color: var(--neon-cyan-dim); } .lecture.live.watched .lec-pill { color: var(--neon-green); border-color: var(--neon-green-dim); } /* ─── Subscribe ───────────────────────────────────────────── */ .subscribe { margin-top: 3.5rem; padding: 2rem; background: var(--bg-glass); backdrop-filter: blur(12px); border: 1px solid var(--border-strong); border-radius: 14px; text-align: center; } .subscribe h3 { font-size: 1.2rem; font-weight: 700; letter-spacing: -0.01em; margin-bottom: 0.4rem; } .subscribe p { font-size: 0.94rem; color: var(--text-soft); max-width: 500px; margin: 0 auto 1.2rem; line-height: 1.5; } .substack-frame-wrap { max-width: 480px; margin: 0 auto; border-radius: 10px; overflow: hidden; background: #FFFFFF; border: 1px solid var(--border); box-shadow: 0 4px 18px rgba(0, 0, 0, 0.18); } .substack-frame { display: block; width: 100%; height: 160px; border: 0; background: #FFFFFF; } .subscribe-form { display: flex; flex-wrap: wrap; gap: 0.5rem; max-width: 460px; margin: 0 auto; } .subscribe-form input[type="email"] { flex: 1; min-width: 200px; background: var(--bg-elevated); border: 1px solid var(--border); border-radius: 10px; padding: 0.7rem 1rem; color: var(--text); font-family: var(--font-body); font-size: 0.96rem; outline: none; transition: border-color 0.18s; } .subscribe-form input[type="email"]:focus { border-color: var(--neon-cyan); } .subscribe-form button { background: linear-gradient(135deg, var(--neon-cyan) 0%, var(--neon-purple) 100%); border: none; border-radius: 10px; padding: 0.7rem 1.4rem; color: #0A0A0E; font-family: var(--font-body); font-size: 0.96rem; font-weight: 700; cursor: pointer; transition: transform 0.18s, box-shadow 0.18s; } .subscribe-form button:hover { transform: translateY(-1px); box-shadow: 0 6px 22px var(--neon-cyan-glow); } .subscribe-note { font-size: 0.74rem; color: var(--text-faint); margin-top: 0.9rem; font-family: var(--font-mono); } /* ─── Footer ──────────────────────────────────────────────── */ .footer { margin-top: 3rem; padding-top: 1.4rem; border-top: 1px solid var(--border); display: flex; flex-wrap: wrap; justify-content: space-between; gap: 0.85rem; font-family: var(--font-mono); font-size: 0.76rem; color: var(--text-muted); letter-spacing: 0.04em; } .footer a { color: var(--text-soft); text-decoration: none; } .footer a:hover { color: var(--neon-cyan); } /* ─── Lecture page ────────────────────────────────────────── */ .breadcrumb { font-family: var(--font-mono); font-size: 0.78rem; color: var(--text-muted); margin-bottom: 1.5rem; letter-spacing: 0.04em; } .breadcrumb a { color: var(--text-soft); } .breadcrumb a:hover { color: var(--neon-cyan); } .breadcrumb .sep { color: var(--text-faint); margin: 0 0.45rem; } .lecture-head { margin-bottom: 1.6rem; } .lecture-eyebrow { font-family: var(--font-mono); font-size: 0.74rem; letter-spacing: 0.18em; text-transform: uppercase; color: var(--neon-cyan); margin-bottom: 0.6rem; } .lecture-title { font-size: clamp(1.7rem, 4vw, 2.4rem); font-weight: 800; letter-spacing: -0.02em; line-height: 1.15; margin-bottom: 0.65rem; } .lecture-meta-row { display: flex; flex-wrap: wrap; align-items: center; gap: 0.85rem; margin-bottom: 1.4rem; } .watched-toggle { display: inline-flex; align-items: center; gap: 0.45rem; cursor: pointer; user-select: none; background: var(--bg-elevated); border: 1px solid var(--border); border-radius: 8px; padding: 0.46rem 0.9rem; color: var(--text-soft); font-family: var(--font-mono); font-size: 0.8rem; letter-spacing: 0.04em; transition: all 0.18s ease; } .watched-toggle:hover { border-color: var(--neon-green-dim); color: var(--neon-green); } .watched-toggle.on { background: var(--neon-green-dim); border-color: var(--neon-green); color: var(--neon-green); } .video-wrap { position: relative; width: 100%; padding-bottom: 56.25%; background: var(--bg-elevated); border: 1px solid var(--border-strong); border-radius: 12px; overflow: hidden; margin-bottom: 2rem; box-shadow: 0 12px 44px rgba(0, 0, 0, 0.4); } .video-wrap iframe { position: absolute; inset: 0; width: 100%; height: 100%; border: 0; } /* ============================================================ * TUTORIAL (markdown) — readable typography * ============================================================ */ .tutorial { margin-top: 2rem; padding-top: 2rem; border-top: 1px solid var(--border); font-size: 1.08rem; line-height: 1.72; color: var(--text-soft); } .tutorial > p:first-of-type { font-size: 1.18rem; color: var(--text); font-weight: 400; line-height: 1.55; margin-bottom: 1.3rem; } .tutorial h2 { font-size: 1.55rem; font-weight: 700; margin: 2.5rem 0 0.85rem; color: var(--text); letter-spacing: -0.015em; position: relative; padding-left: 1rem; line-height: 1.25; } .tutorial h2::before { content: ""; position: absolute; left: 0; top: 0.35em; bottom: 0.35em; width: 3px; border-radius: 2px; background: linear-gradient(180deg, var(--neon-cyan) 0%, var(--neon-purple) 100%); } .tutorial h3 { font-size: 1.18rem; font-weight: 700; margin: 1.85rem 0 0.65rem; color: var(--neon-cyan); letter-spacing: -0.005em; } .tutorial h3::before { content: "→ "; color: var(--text-faint); font-weight: 400; } .tutorial p { margin-bottom: 1.05rem; } .tutorial strong { color: var(--neon-cyan); font-weight: 600; } .tutorial em { color: var(--neon-green); font-style: normal; font-weight: 500; } .tutorial ul, .tutorial ol { margin: 0.5rem 0 1.2rem 0; padding-left: 1.5rem; list-style: none; } .tutorial ul li, .tutorial ol li { position: relative; margin-bottom: 0.5rem; padding-left: 0.4rem; } .tutorial ul li::before { content: "▸"; position: absolute; left: -1.2rem; top: 0; color: var(--neon-cyan); font-size: 0.95em; } .tutorial ol { counter-reset: ol-counter; } .tutorial ol li { counter-increment: ol-counter; } .tutorial ol li::before { content: counter(ol-counter); position: absolute; left: -1.5rem; top: 0; width: 1.1rem; text-align: right; color: var(--neon-purple); font-family: var(--font-mono); font-weight: 700; font-size: 0.95em; } .tutorial code { font-family: var(--font-mono); font-size: 0.88em; background: var(--bg-elevated); border: 1px solid var(--border); border-radius: 5px; padding: 0.12em 0.42em; color: var(--neon-cyan); } .tutorial pre { background: var(--bg-surface); border: 1px solid var(--border-strong); border-radius: 10px; padding: 1.1rem 1.2rem; overflow-x: auto; margin: 1.2rem 0; line-height: 1.55; font-size: 0.94rem; } .tutorial pre code { background: none; border: none; padding: 0; color: var(--text); font-size: inherit; } .tutorial blockquote { position: relative; margin: 1.4rem 0; padding: 0.95rem 1.2rem 0.95rem 1.4rem; background: var(--neon-purple-dim); border-left: 3px solid var(--neon-purple); border-radius: 0 9px 9px 0; color: var(--text); font-style: normal; font-size: 1rem; line-height: 1.6; } .tutorial blockquote p { margin-bottom: 0; } .tutorial blockquote p + p { margin-top: 0.6rem; } .tutorial table { border-collapse: collapse; margin: 1.2rem 0; font-size: 0.95em; width: 100%; border: 1px solid var(--border-strong); border-radius: 10px; overflow: hidden; } .tutorial th, .tutorial td { text-align: left; padding: 0.65rem 1rem; border-bottom: 1px solid var(--border); } .tutorial tr:last-child td { border-bottom: none; } .tutorial th { background: var(--bg-elevated); color: var(--text); font-weight: 600; font-family: var(--font-mono); font-size: 0.84rem; letter-spacing: 0.04em; text-transform: uppercase; } .tutorial hr { border: none; border-top: 1px solid var(--border); margin: 2.2rem 0; } .tutorial a { color: var(--neon-cyan); border-bottom: 1px dotted var(--neon-cyan-dim); } .tutorial a:hover { border-bottom-color: var(--neon-cyan); } .lecture-nav { display: flex; justify-content: space-between; gap: 0.9rem; margin-top: 2.6rem; padding-top: 1.6rem; border-top: 1px solid var(--border); } .lecture-nav a { flex: 1; display: flex; flex-direction: column; gap: 0.25rem; padding: 0.9rem 1.1rem; background: var(--bg-elevated); border: 1px solid var(--border); border-radius: 10px; text-decoration: none; color: inherit; transition: all 0.18s ease; max-width: 48%; } .lecture-nav a:hover { border-color: var(--neon-cyan-dim); background: var(--neon-cyan-dim); } .lecture-nav a.disabled { opacity: 0.32; pointer-events: none; } .lecture-nav .dir { font-family: var(--font-mono); font-size: 0.7rem; letter-spacing: 0.1em; text-transform: uppercase; color: var(--text-muted); } .lecture-nav .label { font-size: 0.94rem; font-weight: 500; color: var(--text); } .lecture-nav .next { text-align: right; align-items: flex-end; } /* ─── Toasts (chapter complete + storage info) ─────────────── */ .toast { position: fixed; top: calc(var(--topbar-h) + 14px); left: 50%; transform: translateX(-50%) translateY(-30px); z-index: 60; display: flex; align-items: center; gap: 0.85rem; max-width: 440px; padding: 0.85rem 1.1rem 0.85rem 0.95rem; background: var(--bg-elevated); border-radius: 12px; backdrop-filter: blur(14px); -webkit-backdrop-filter: blur(14px); color: var(--text); opacity: 0; transition: all 0.4s cubic-bezier(.2,.8,.2,1); pointer-events: none; } .toast.show { opacity: 1; transform: translateX(-50%) translateY(0); pointer-events: auto; } .toast.complete { border: 1px solid var(--neon-green); box-shadow: 0 10px 36px rgba(57, 255, 20, 0.28); } .toast.storage { border: 1px solid var(--neon-amber); box-shadow: 0 10px 36px rgba(255, 184, 0, 0.22); } .toast .t-icon { width: 36px; height: 36px; border-radius: 9px; display: grid; place-items: center; font-size: 1.1rem; flex-shrink: 0; } .toast.complete .t-icon { background: var(--neon-green-dim); border: 1px solid var(--neon-green); } .toast.storage .t-icon { background: var(--neon-amber-dim); border: 1px solid var(--neon-amber); color: var(--neon-amber); font-weight: 800; } .toast .t-meta { flex: 1; min-width: 0; } .toast .t-title { font-size: 0.96rem; font-weight: 700; letter-spacing: -0.01em; margin-bottom: 0.18rem; } .toast.complete .t-title { color: var(--neon-green); } .toast.storage .t-title { color: var(--neon-amber); } .toast .t-sub { font-size: 0.82rem; color: var(--text-soft); line-height: 1.45; } .toast .t-close { flex-shrink: 0; background: transparent; border: none; color: var(--text-muted); font-size: 1.4rem; cursor: pointer; width: 24px; height: 24px; line-height: 1; border-radius: 5px; transition: all 0.15s ease; } .toast .t-close:hover { color: var(--text); background: var(--border); } /* ─── Mobile ──────────────────────────────────────────────── */ @media (max-width: 800px) { html { font-size: 16px; } .topbrand .logo-text { font-size: 0.74rem; } .topbrand-inner { padding: 0 0.85rem; } :root { --sidebar-rail: 40px; } .app { grid-template-columns: var(--sidebar-rail) 1fr; } .app:not(.sb-collapsed) { grid-template-columns: var(--sidebar-rail) 1fr; } /* On mobile, "expanded" shows as overlay drawer */ .app:not(.sb-collapsed) .sidebar { position: fixed; top: var(--topbar-h); left: 0; width: var(--sidebar-w); height: calc(100vh - var(--topbar-h)); z-index: 25; box-shadow: 4px 0 28px rgba(0, 0, 0, 0.45); } /* Mobile: by default, sidebar should be collapsed (rail visible) */ .app:not(.sb-collapsed) .sb-brand-link, .app:not(.sb-collapsed) .sb-progress, .app:not(.sb-collapsed) .sb-nav, .app:not(.sb-collapsed) .sb-footer { display: revert; } .app:not(.sb-collapsed) .sb-brand { justify-content: space-between; padding: 1rem 0.85rem 1rem 1.1rem; } .app:not(.sb-collapsed) .scrim { display: block; position: fixed; inset: var(--topbar-h) 0 0 0; background: rgba(0, 0, 0, 0.6); z-index: 24; opacity: 1; pointer-events: auto; transition: opacity 0.25s ease; } .content { padding: 1.25rem 1rem 0; } .content-no-banner { padding: 1.25rem 1rem 0; } .banner-grid { grid-template-columns: 1fr; gap: 1.25rem; padding: 1.5rem 1rem 1.75rem; } .banner-art-wrap { order: -1; max-width: 240px; margin: 0 auto; justify-self: center; } .banner-title { font-size: 1.9rem; white-space: normal; } .banner-sub { font-size: 1rem; } .chapter-head { padding: 0.9rem 1rem; gap: 0.8rem; } .chapter-num { width: 36px; height: 36px; font-size: 0.84rem; } .chapter-title { font-size: 1rem; } .chapter-desc { font-size: 0.88rem; } .lec-num { width: 32px; font-size: 0.74rem; } .lec-title { font-size: 0.92rem; } .lecture-nav { flex-direction: column; } .lecture-nav a { max-width: 100%; } .lecture-nav .next { text-align: left; align-items: flex-start; } .toast { left: 12px; right: 12px; transform: translateY(-30px); max-width: none; } .toast.show { transform: translateY(0); } } @media (prefers-reduced-motion: reduce) { * { animation-duration: 0.01ms !important; transition-duration: 0.01ms !important; } .banner-art animate, .banner-art animateMotion, .banner-art animateTransform { display: none; } }