/* ========================================================== Rahein Education — LeetCode-style theme Dark by default, light via Base type: system UI stack, 14px (same approach as LeetCode) ========================================================== */ :root { --bg: #1a1a1a; --layer1: #282828; --layer2: #303030; --layer3: #3e3e3e; --border: #3e3e3e; --text: #eff1f6; --text2: #b4b9c5; --text3: #8b909c; --accent: #ffa116; /* fills */ --accent-hover: #ffb340; --accent-ink: #ffa116; /* accent used as text colour */ --on-accent: #1a1a1a; --phy: #4da3ff; --chem: #c68bff; --bio: #2cbb5d; --font: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "Helvetica Neue", Arial, sans-serif; --mono: "SFMono-Regular", Menlo, Consolas, "Liberation Mono", monospace; --radius: 8px; --wrap: 1160px; } :root[data-theme="light"] { --bg: #f5f5f5; --layer1: #ffffff; --layer2: #f2f2f2; --layer3: #e6e6e6; --border: #e3e3e3; --text: #262626; --text2: #595959; --text3: #8c8c8c; --accent-ink: #b36200; --phy: #0a6fd6; --chem: #8a3fd1; --bio: #178f42; } *, *::before, *::after { box-sizing: border-box; } html { scroll-behavior: smooth; scroll-padding-top: 66px; } body { margin: 0; background: var(--bg); color: var(--text2); font-family: var(--font); font-size: 14px; line-height: 1.6; -webkit-font-smoothing: antialiased; } h1, h2, h3, h4 { margin: 0; color: var(--text); font-weight: 600; line-height: 1.25; } p { margin: 0; } a { color: inherit; text-decoration: none; } ul { margin: 0; padding: 0; list-style: none; } :focus-visible { outline: 2px solid var(--accent); outline-offset: 2px; border-radius: 4px; } .wrap { max-width: var(--wrap); margin: 0 auto; padding: 0 20px; } /* ---------- Buttons ---------- */ .btn { display: inline-flex; align-items: center; justify-content: center; height: 32px; padding: 0 14px; border: 1px solid transparent; border-radius: 6px; font: inherit; font-weight: 500; font-size: 14px; cursor: pointer; transition: background .15s, border-color .15s; white-space: nowrap; } .btn-primary { background: var(--accent); color: var(--on-accent); font-weight: 600; } .btn-primary:hover { background: var(--accent-hover); } .btn-secondary { background: var(--layer3); color: var(--text); } .btn-secondary:hover { background: color-mix(in srgb, var(--layer3) 80%, var(--text) 20%); } .btn-ghost { color: var(--text2); } .btn-ghost:hover { color: var(--text); } .btn-lg { height: 40px; padding: 0 20px; font-size: 15px; border-radius: 8px; } /* ---------- Navbar ---------- */ .nav { position: sticky; top: 0; z-index: 50; height: 50px; background: var(--layer1); border-bottom: 1px solid var(--border); } .nav .wrap { height: 100%; display: flex; align-items: center; gap: 28px; } .logo { display: flex; align-items: center; gap: 10px; color: var(--text); font-weight: 600; font-size: 15px; } .logo-mark { width: 26px; height: 26px; border-radius: 6px; background: var(--accent); color: var(--on-accent); display: grid; place-items: center; font-size: 15px; font-weight: 800; font-family: var(--mono); } .logo-sub { font-size: 11px; font-weight: 500; color: var(--text3); border: 1px solid var(--border); border-radius: 4px; padding: 0 6px; line-height: 18px; } .nav-links { display: flex; gap: 4px; } .nav-links a { padding: 6px 10px; border-radius: 6px; color: var(--text2); font-weight: 500; } .nav-links a:hover { color: var(--text); background: var(--layer2); } .nav-right { margin-left: auto; display: flex; align-items: center; gap: 8px; } .theme-btn { width: 32px; height: 32px; border-radius: 6px; border: 0; background: transparent; color: var(--text2); cursor: pointer; display: grid; place-items: center; } .theme-btn:hover { background: var(--layer2); color: var(--text); } .theme-btn svg { width: 18px; height: 18px; } .theme-btn .i-sun { display: none; } :root[data-theme="light"] .theme-btn .i-sun { display: block; } :root[data-theme="light"] .theme-btn .i-moon { display: none; } /* ---------- Hero ---------- */ .hero { padding: 64px 0 40px; } .hero .wrap { display: grid; grid-template-columns: 1.1fr .9fr; gap: 56px; align-items: center; } .hero-tag { display: inline-flex; align-items: center; gap: 8px; padding: 3px 10px; border-radius: 999px; background: color-mix(in srgb, var(--accent) 14%, transparent); color: var(--accent-ink); font-size: 12px; font-weight: 600; margin-bottom: 20px; } .hero-tag i { width: 6px; height: 6px; border-radius: 50%; background: var(--accent); display: block; } .hero h1 { font-size: 44px; font-weight: 700; letter-spacing: -0.02em; line-height: 1.12; } .hero .lead { margin-top: 16px; font-size: 16px; line-height: 1.65; color: var(--text2); max-width: 520px; } .cta-row { margin-top: 28px; display: flex; gap: 10px; flex-wrap: wrap; } /* Study card (right column) */ .panel { background: var(--layer1); border: 1px solid var(--border); border-radius: 12px; overflow: hidden; } .panel-head { display: flex; align-items: center; justify-content: space-between; padding: 12px 16px; background: var(--layer2); border-bottom: 1px solid var(--border); } .panel-head strong { color: var(--text); font-weight: 600; } .panel-head span { font-size: 12px; color: var(--text3); } .subj-row { display: flex; align-items: center; gap: 12px; padding: 12px 16px; border-bottom: 1px solid var(--border); } .subj-row:last-of-type { border-bottom: 0; } .dot { width: 8px; height: 8px; border-radius: 50%; flex: none; } .dot.phy { background: var(--phy); } .dot.chem { background: var(--chem); } .dot.bio { background: var(--bio); } .subj-row b { color: var(--text); font-weight: 500; min-width: 84px; } .subj-row .tags { margin-left: auto; display: flex; gap: 6px; } .pill { display: inline-block; padding: 1px 8px; border-radius: 999px; background: var(--layer3); color: var(--text2); font-size: 12px; line-height: 20px; font-weight: 500; } .pill.phy { color: var(--phy); background: color-mix(in srgb, var(--phy) 15%, transparent); } .pill.chem { color: var(--chem); background: color-mix(in srgb, var(--chem) 15%, transparent); } .pill.bio { color: var(--bio); background: color-mix(in srgb, var(--bio) 15%, transparent); } .daily-strip { display: flex; align-items: center; justify-content: space-between; gap: 12px; padding: 14px 16px; background: var(--layer2); border-top: 1px solid var(--border); } .daily-strip span { color: var(--text2); } .qdots { display: flex; gap: 6px; } .qdots i { width: 24px; height: 24px; border-radius: 6px; border: 1px solid var(--border); background: var(--layer1); display: grid; place-items: center; font: 600 11px var(--mono); font-style: normal; color: var(--text3); } /* ---------- Stats strip ---------- */ .stats { padding: 8px 0 24px; } .stats-grid { display: grid; grid-template-columns: repeat(4, 1fr); background: var(--layer1); border: 1px solid var(--border); border-radius: 12px; } .stat { padding: 18px 20px; border-right: 1px solid var(--border); } .stat:last-child { border-right: 0; } .stat b { display: block; color: var(--text); font-size: 22px; font-weight: 700; line-height: 1.2; } .stat span { font-size: 13px; color: var(--text3); } /* ---------- Sections ---------- */ .section { padding: 48px 0; } .section-head { margin-bottom: 24px; } .section-head h2 { font-size: 24px; letter-spacing: -0.01em; } .section-head p { margin-top: 6px; color: var(--text3); font-size: 14px; max-width: 560px; } /* Subject cards */ .cards { display: grid; grid-template-columns: repeat(3, 1fr); gap: 16px; } .card { background: var(--layer1); border: 1px solid var(--border); border-radius: 12px; padding: 20px; display: flex; flex-direction: column; } .card:hover { border-color: var(--text3); } .card-icon { width: 40px; height: 40px; border-radius: 10px; margin-bottom: 16px; display: grid; place-items: center; font: 700 12px var(--mono); letter-spacing: .02em; } .card.phy .card-icon { color: var(--phy); background: color-mix(in srgb, var(--phy) 15%, transparent); } .card.chem .card-icon { color: var(--chem); background: color-mix(in srgb, var(--chem) 15%, transparent); } .card.bio .card-icon { color: var(--bio); background: color-mix(in srgb, var(--bio) 15%, transparent); } .card h3 { font-size: 16px; } .card p { margin-top: 6px; color: var(--text3); } .card .tags { margin-top: auto; padding-top: 18px; display: flex; flex-wrap: wrap; gap: 6px; } /* Problem-list style table */ .list { border: 1px solid var(--border); border-radius: 12px; overflow: hidden; background: var(--layer1); } .list-row { display: grid; grid-template-columns: 48px 200px 1fr 170px; gap: 12px; align-items: center; padding: 14px 16px; } .list-row:nth-child(even) { background: var(--layer2); } .list-row.head { background: var(--layer2); color: var(--text3); font-size: 12px; font-weight: 600; padding-top: 10px; padding-bottom: 10px; border-bottom: 1px solid var(--border); } .list-row .tick { color: var(--bio); display: grid; place-items: center; } .list-row .tick svg { width: 18px; height: 18px; } .list-row .title { color: var(--text); font-weight: 500; } .list-row .access { color: var(--text3); text-align: right; font-size: 13px; } /* Steps */ .steps { display: grid; grid-template-columns: repeat(4, 1fr); gap: 16px; } .step { background: var(--layer1); border: 1px solid var(--border); border-radius: 12px; padding: 20px; } .step-num { width: 28px; height: 28px; border-radius: 50%; border: 1px solid var(--accent); color: var(--accent-ink); display: grid; place-items: center; font: 600 13px var(--mono); margin-bottom: 14px; } .step h4 { font-size: 15px; } .step p { margin-top: 4px; color: var(--text3); } /* Daily 5 */ .banner { background: var(--layer1); border: 1px solid var(--border); border-left: 3px solid var(--accent); border-radius: 12px; padding: 24px 28px; display: flex; align-items: center; justify-content: space-between; gap: 24px; flex-wrap: wrap; } .banner h2 { font-size: 20px; } .banner p { margin-top: 4px; color: var(--text3); } .channels { display: flex; gap: 8px; flex-wrap: wrap; } /* Final CTA */ .cta { text-align: center; padding: 56px 0 72px; } .cta h2 { font-size: 28px; letter-spacing: -0.01em; } .cta p { margin: 8px 0 24px; color: var(--text3); font-size: 15px; } /* ---------- Footer ---------- */ .footer { border-top: 1px solid var(--border); background: var(--layer1); padding: 20px 0; font-size: 13px; color: var(--text3); } .footer .wrap { display: flex; align-items: center; justify-content: space-between; gap: 16px; flex-wrap: wrap; } .footer nav { display: flex; gap: 16px; } .footer a:hover { color: var(--text); } /* ---------- Responsive ---------- */ @media (max-width: 960px) { .hero { padding-top: 40px; } .hero .wrap { grid-template-columns: 1fr; gap: 32px; } .hero h1 { font-size: 36px; } .cards, .steps { grid-template-columns: 1fr 1fr; } .stats-grid { grid-template-columns: 1fr 1fr; } .stat:nth-child(2) { border-right: 0; } .stat:nth-child(-n+2) { border-bottom: 1px solid var(--border); } } @media (max-width: 820px) { .nav-links { display: none; } } @media (max-width: 640px) { .hero h1 { font-size: 30px; } .cards, .steps { grid-template-columns: 1fr; } .list-row { grid-template-columns: 32px 1fr; } .list-row.head { display: none; } .list-row .desc, .list-row .access { grid-column: 2; text-align: left; } .subj-row { flex-wrap: wrap; } .subj-row .tags { margin-left: 20px; width: 100%; } .logo-sub { display: none; } .btn-ghost.hide-sm { display: none; } } @media (prefers-reduced-motion: reduce) { html { scroll-behavior: auto; } * { transition: none !important; } }