:root {
            --bg: #060e10;
            --bg-soft: #0c1619;
            --bg-warm: #0f181c;
            --ink: #edf6f2;
            --ink-soft: #b8cfc5;
            --muted: #71998a;
            --accent: #2dd4a8;
            --accent-light: rgba(45, 212, 168, 0.13);
            --coral: #ff6b6b;
            --coral-light: rgba(255, 107, 107, 0.12);
            --mint: #48cae4;
            --mint-light: rgba(72, 202, 228, 0.12);
            --amber: #ffb347;
            --amber-light: rgba(255, 179, 71, 0.13);
            --violet: #b388eb;
            --violet-light: rgba(179, 136, 235, 0.12);
            --teal: #3dd9a6;
            --teal-light: rgba(61, 217, 166, 0.12);
            --line: rgba(237, 246, 242, 0.07);
            --line-dark: rgba(237, 246, 242, 0.14);
            --card: #101a1d;
            --card-hover: #162125;
            --shadow: 0 6px 24px rgba(0, 0, 0, 0.28);
            --shadow-lg: 0 18px 48px rgba(0, 0, 0, 0.38);
        }
        *,
        *::before,
        *::after { margin: 0; padding: 0; box-sizing: border-box; }
        html { scroll-behavior: smooth; font-size: 16px; overflow-x: hidden; }
        body { font-family: 'DM Sans', sans-serif; background: var(--bg); color: var(--ink); overflow-x: hidden; line-height: 1.6; -webkit-font-smoothing: antialiased; }
        ::selection { background: var(--accent); color: #000; }
        a { text-decoration: none; color: inherit; transition: all 0.3s cubic-bezier(.22, 1, .36, 1); }
        ul { list-style: none; }
        .container { width: 100%; max-width: 1280px; margin: 0 auto; padding: 0 clamp(20px, 4vw, 48px); }
        h1, h2, h3 { font-family: 'Instrument Serif', serif; font-weight: 400; letter-spacing: -.02em; }

        /* NAV */
        nav { position: fixed; top: 0; left: 0; right: 0; z-index: 999; backdrop-filter: blur(24px) saturate(1.8); -webkit-backdrop-filter: blur(24px) saturate(1.8); background: rgba(6, 14, 16, 0.78); border-bottom: 1px solid var(--line); transition: box-shadow 0.35s ease; }
        nav.scrolled { box-shadow: 0 4px 24px rgba(0, 0, 0, 0.45); background: rgba(6, 14, 16, 0.9); }
        .nav-inner { display: flex; align-items: center; justify-content: space-between; height: 62px; }
        .logo { display: flex; align-items: center; gap: 10px; font-family: 'Instrument Serif', serif; font-size: 1.3rem; color: var(--ink); letter-spacing: -.01em; z-index: 2; }
        .logo-icon { width: 30px; height: 30px; border-radius: 8px; background: linear-gradient(135deg, var(--accent), #1a9e7a); display: flex; align-items: center; justify-content: center; box-shadow: 0 2px 10px rgba(45, 212, 168, 0.35); transition: transform 0.35s cubic-bezier(.34, 1.56, .64, 1); }
        .logo:hover .logo-icon { transform: rotate(-6deg) scale(1.1); }
        .nav-right { display: flex; align-items: center; gap: 4px; }
        .nav-right a { padding: 8px 15px; border-radius: 8px; font-size: .86rem; font-weight: 500; color: var(--ink-soft); transition: all 0.22s ease; }
        .nav-right a:hover { background: rgba(255, 255, 255, 0.04); color: var(--ink); }
        .nav-right a.active { background: var(--accent-light); color: var(--accent); font-weight: 600; }
        .mobile-btn { display: none; background: none; border: none; color: var(--ink); font-size: 1.5rem; cursor: pointer; padding: 4px; z-index: 2; }

        /* BREADCRUMB */
        .breadcrumb { padding: 84px 0 0; position: relative; z-index: 1; font-family: 'JetBrains Mono', monospace; font-size: .78rem; color: var(--muted); }
        .breadcrumb a { color: var(--muted); } .breadcrumb a:hover { color: var(--accent); }
        .breadcrumb .sep { margin: 0 8px; opacity: .4; }

        /* HERO */
        .hero { padding: clamp(20px, 2vh, 36px) 0 clamp(30px, 3vh, 48px); position: relative; z-index: 1; text-align: center; }
        .hero h1 { font-size: clamp(2.8rem, 6vw, 5rem); line-height: 1; margin-bottom: 20px; }
        .hero h1 em { font-style: italic; background: linear-gradient(135deg, var(--accent), var(--mint)); -webkit-background-clip: text; -webkit-text-fill-color: transparent; background-clip: text; }
        .hero > p { color: var(--muted); font-size: 1.05rem; max-width: 520px; margin: 0 auto 32px; line-height: 1.8; }

        /* SEARCH */
        .search-wrap { max-width: 560px; margin: 0 auto 40px; position: relative; }
        .search-input { width: 100%; padding: 16px 20px 16px 52px; border-radius: 14px; border: 1.5px solid var(--line-dark); background: var(--card); color: var(--ink); font-family: 'DM Sans', sans-serif; font-size: 1rem; outline: none; transition: all 0.3s ease; box-shadow: var(--shadow); }
        .search-input::placeholder { color: var(--muted); font-size: .92rem; }
        .search-input:focus { border-color: var(--accent); box-shadow: 0 0 0 3px var(--accent-light), var(--shadow-lg); }
        .search-icon { position: absolute; left: 18px; top: 50%; transform: translateY(-50%); color: var(--muted); pointer-events: none; transition: color 0.3s ease; }
        .search-input:focus~.search-icon { color: var(--accent); }
        .search-kbd { position: absolute; right: 14px; top: 50%; transform: translateY(-50%); font-family: 'JetBrains Mono', monospace; font-size: .72rem; padding: 3px 8px; border-radius: 5px; background: rgba(255, 255, 255, 0.05); border: 1px solid var(--line); color: var(--muted); pointer-events: none; }

        /* STATS */
        .stats-row { display: flex; justify-content: center; gap: clamp(24px, 4vw, 56px); flex-wrap: wrap; }
        .sr-item { text-align: center; }
        .sr-num { font-family: 'Instrument Serif', serif; font-size: 1.8rem; line-height: 1; }
        .sr-item:nth-child(1) .sr-num { color: var(--accent); }
        .sr-item:nth-child(2) .sr-num { color: var(--coral); }
        .sr-item:nth-child(3) .sr-num { color: var(--mint); }
        .sr-label { font-family: 'JetBrains Mono', monospace; font-size: .72rem; color: var(--muted); margin-top: 4px; }

        /* FEATURED */
        .featured { padding: clamp(30px, 4vh, 56px) 0; }
        .feat-row { display: grid; grid-template-columns: repeat(3, 1fr); gap: 14px; }
        .feat-card { background: var(--card); border: 1px solid var(--line); border-radius: 16px; padding: 24px; display: flex; align-items: flex-start; gap: 14px; transition: all 0.3s ease; cursor: pointer; }
        .feat-card:hover { transform: translateY(-3px); box-shadow: var(--shadow); background: var(--card-hover); }
        .feat-num { width: 36px; height: 36px; border-radius: 10px; display: flex; align-items: center; justify-content: center; font-family: 'JetBrains Mono', monospace; font-size: .78rem; font-weight: 500; flex-shrink: 0; }
        .fn1 { background: var(--accent-light); color: var(--accent); }
        .fn2 { background: var(--coral-light); color: var(--coral); }
        .fn3 { background: var(--mint-light); color: var(--mint); }
        .feat-text .ft-q { font-weight: 600; font-size: .92rem; line-height: 1.4; margin-bottom: 6px; }
        .feat-text .ft-a { color: var(--muted); font-size: .82rem; line-height: 1.6; }
        .feat-link { font-family: 'JetBrains Mono', monospace; font-size: .72rem; color: var(--accent); margin-top: 8px; display: flex; align-items: center; gap: 4px; }

        /* CATEGORY SECTION */
        .category-section { padding: clamp(40px, 5vh, 64px) 0; position: relative; }
        .category-section:nth-child(odd) { background: var(--bg-warm); }
        .category-section:nth-child(odd)::before { content: ''; position: absolute; top: 0; left: 0; right: 0; height: 1px; background: var(--line); }
        .category-section:nth-child(odd)::after { content: ''; position: absolute; bottom: 0; left: 0; right: 0; height: 1px; background: var(--line); }
        .cat-head { display: flex; align-items: center; gap: 20px; margin-bottom: clamp(28px, 3vw, 44px); flex-wrap: wrap; }
        .ch-num { font-family: 'Instrument Serif', serif; font-size: clamp(3.5rem, 7vw, 6rem); line-height: .85; color: var(--line-dark); }
        .ch-info .ch-tag { display: inline-flex; align-items: center; gap: 6px; font-family: 'JetBrains Mono', monospace; font-size: .72rem; font-weight: 500; letter-spacing: .08em; text-transform: uppercase; padding: 4px 12px; border-radius: 5px; margin-bottom: 8px; }
        .ct-blue { background: var(--accent-light); color: var(--accent); }
        .ct-violet { background: var(--violet-light); color: var(--violet); }
        .ct-mint { background: var(--mint-light); color: var(--mint); }
        .ct-amber { background: var(--amber-light); color: var(--amber); }
        .ct-coral { background: var(--coral-light); color: var(--coral); }
        .ct-teal { background: var(--teal-light); color: var(--teal); }
        .ch-info h2 { font-size: clamp(1.6rem, 3vw, 2.2rem); line-height: 1.1; }
        .ch-count { margin-left: auto; font-family: 'JetBrains Mono', monospace; font-size: .82rem; color: var(--muted); padding: 6px 14px; border-radius: 8px; background: var(--card); border: 1px solid var(--line); }

        /* FAQ LIST */
        .faq-list { display: grid; grid-template-columns: 1fr 1fr; gap: 0; }
        .faq-line { padding: 18px 0; border-bottom: 1px solid var(--line); cursor: pointer; transition: background 0.2s ease; }
        .faq-line:last-child { border-bottom: none; }
        .faq-line:hover { background: rgba(45, 212, 168, 0.03); }
        .faq-line:first-child { border-top: 1px solid var(--line); }
        .fl-q { display: flex; align-items: flex-start; gap: 12px; padding: 0 20px; }
        .fl-mark { font-family: 'Instrument Serif', serif; font-size: 1.4rem; line-height: 1.3; flex-shrink: 0; width: 24px; }
        .faq-line.fl-accent .fl-mark { color: var(--accent); }
        .faq-line.fl-coral .fl-mark { color: var(--coral); }
        .faq-line.fl-mint .fl-mark { color: var(--mint); }
        .faq-line.fl-amber .fl-mark { color: var(--amber); }
        .faq-line.fl-violet .fl-mark { color: var(--violet); }
        .faq-line.fl-teal .fl-mark { color: var(--teal); }
        .fl-q-text { flex: 1; font-weight: 600; font-size: .95rem; line-height: 1.45; padding-right: 8px; }
        .fl-toggle { width: 24px; height: 24px; border-radius: 6px; display: flex; align-items: center; justify-content: center; background: rgba(255, 255, 255, 0.03); border: 1px solid transparent; flex-shrink: 0; margin-top: 2px; transition: all 0.3s ease; }
        .faq-line:hover .fl-toggle { border-color: var(--line); }
        .faq-line.open .fl-toggle { background: var(--accent-light); border-color: rgba(45, 212, 168, 0.25); }
        .fl-toggle svg { transition: transform 0.3s ease; }
        .faq-line.open .fl-toggle svg { transform: rotate(180deg); }
        .fl-answer { max-height: 0; overflow: hidden; transition: max-height 0.35s cubic-bezier(.22, 1, .36, 1); }
        .faq-line.open .fl-answer { max-height: 600px; }
        .fl-answer-inner { padding: 14px 20px 4px 56px; }
        .fl-answer-inner p { color: var(--ink-soft); font-size: .9rem; line-height: 1.8; }
        .fl-answer-inner code { font-family: 'JetBrains Mono', monospace; font-size: .82rem; padding: 2px 8px; border-radius: 4px; background: var(--accent-light); color: var(--accent); }
        .fl-answer-inner a { color: var(--accent); border-bottom: 1px solid rgba(45, 212, 168, 0.2); }
        .fl-answer-inner a:hover { border-bottom-color: var(--accent); }
        .fl-answer-inner ul { margin-top: 10px; display: flex; flex-direction: column; gap: 6px; }
        .fl-answer-inner ul li { position: relative; padding-left: 16px; color: var(--ink-soft); font-size: .88rem; line-height: 1.7; }
        .fl-answer-inner ul li::before { content: ''; position: absolute; left: 0; top: 9px; width: 4px; height: 4px; border-radius: 50%; background: var(--accent); opacity: .6; }
        .fl-answer-inner .tip { margin-top: 12px; padding: 10px 14px; border-radius: 8px; font-size: .82rem; line-height: 1.6; display: flex; align-items: flex-start; gap: 8px; }
        .tip-blue { background: var(--accent-light); color: var(--accent); }
        .tip-amber { background: var(--amber-light); color: var(--amber); }
        .tip-i { flex-shrink: 0; margin-top: 1px; }

        /* TOOL SECTION */
        .tool-section { padding: clamp(50px, 7vh, 90px) 0; border-top: 1px solid var(--line); }
        .section-head { text-align: center; margin-bottom: clamp(36px, 4.5vw, 58px); }
        .section-tag { display: inline-flex; align-items: center; gap: 8px; font-family: 'JetBrains Mono', monospace; font-size: .73rem; font-weight: 500; color: var(--accent); letter-spacing: .13em; text-transform: uppercase; margin-bottom: 14px; }
        .section-tag::before, .section-tag::after { content: ''; width: 18px; height: 1px; background: var(--accent); opacity: .4; }
        .section-head h2 { font-size: clamp(1.9rem, 4vw, 3rem); line-height: 1.1; margin-bottom: 12px; }
        .section-head p { color: var(--muted); font-size: .98rem; max-width: 480px; margin: 0 auto; }
        .tool-grid { display: grid; grid-template-columns: repeat(4, 1fr); gap: 16px; }
        .tool-card { background: var(--card); border: 1px solid var(--line); border-radius: 20px; padding: 26px 20px; text-align: center; transition: all 0.3s ease; }
        .tool-card:hover { transform: translateY(-5px); box-shadow: var(--shadow-lg); background: var(--card-hover); }
        .tool-icon { width: 56px; height: 56px; border-radius: 16px; display: flex; align-items: center; justify-content: center; margin: 0 auto 14px; font-size: 1.8rem; }
        .tool-card:nth-child(1) .tool-icon { background: var(--accent-light); color: var(--accent); }
        .tool-card:nth-child(2) .tool-icon { background: var(--coral-light); color: var(--coral); }
        .tool-card:nth-child(3) .tool-icon { background: var(--mint-light); color: var(--mint); }
        .tool-card:nth-child(4) .tool-icon { background: var(--violet-light); color: var(--violet); }
        .tool-card h3 { font-family: 'DM Sans', sans-serif; font-weight: 700; font-size: 1rem; margin-bottom: 8px; letter-spacing: 0; }
        .tool-card p { color: var(--muted); font-size: .85rem; line-height: 1.6; }

        /* COMMUNITY */
        .community-section { padding: clamp(50px, 7vh, 90px) 0; }
        .comm-tag { color: var(--coral); }
        .comm-tag::before, .comm-tag::after { background: var(--coral); }
        .comm-grid { display: grid; grid-template-columns: 1fr 1fr; gap: 16px; }
        .comm-card { background: var(--card); border: 1px solid var(--line); border-radius: 20px; padding: 24px; transition: all 0.3s ease; }
        .comm-card:hover { box-shadow: var(--shadow); background: var(--card-hover); }
        .comm-quote { font-size: .9rem; line-height: 1.7; color: var(--ink-soft); font-style: italic; margin-bottom: 12px; }
        .comm-author { display: flex; align-items: center; gap: 10px; }
        .comm-avatar { width: 32px; height: 32px; border-radius: 8px; display: flex; align-items: center; justify-content: center; font-size: .75rem; font-weight: 700; color: #fff; background: var(--accent); }
        .comm-name { font-weight: 600; font-size: .85rem; }
        .comm-role { font-size: .75rem; color: var(--muted); }

        /* CONTACT */
        .contact { padding: clamp(60px, 8vh, 100px) 0; }
        .contact-grid { display: grid; grid-template-columns: repeat(3, 1fr); gap: 16px; }
        .cc { background: var(--card); border: 1px solid var(--line); border-radius: 20px; padding: clamp(24px, 2.5vw, 36px); text-align: center; transition: all 0.3s ease; }
        .cc:hover { transform: translateY(-4px); box-shadow: var(--shadow); background: var(--card-hover); }
        .cc-icon { width: 52px; height: 52px; border-radius: 14px; display: flex; align-items: center; justify-content: center; margin: 0 auto 16px; }
        .ci1 { background: var(--accent-light); color: var(--accent); }
        .ci2 { background: var(--coral-light); color: var(--coral); }
        .ci3 { background: var(--mint-light); color: var(--mint); }
        .cc h3 { font-family: 'DM Sans', sans-serif; font-size: 1.05rem; font-weight: 700; margin-bottom: 8px; letter-spacing: 0; }
        .cc p { color: var(--muted); font-size: .88rem; line-height: 1.6; margin-bottom: 16px; }
        .cc-btn { display: inline-flex; align-items: center; gap: 6px; padding: 10px 20px; border-radius: 8px; font-weight: 600; font-size: .85rem; border: none; cursor: pointer; transition: all 0.3s ease; text-decoration: none; }
        .ccb1 { background: var(--accent); color: #000; box-shadow: 0 4px 12px rgba(45, 212, 168, 0.25); }
        .ccb1:hover { background: #3de0b5; box-shadow: 0 6px 20px rgba(45, 212, 168, 0.45); }
        .ccb2 { background: var(--coral); color: #fff; box-shadow: 0 4px 12px rgba(255, 107, 107, 0.25); }
        .ccb2:hover { box-shadow: 0 6px 20px rgba(255, 107, 107, 0.45); }
        .ccb3 { background: var(--mint); color: #060e10; box-shadow: 0 4px 12px rgba(72, 202, 228, 0.25); }
        .ccb3:hover { box-shadow: 0 6px 20px rgba(72, 202, 228, 0.45); }

        /* FOOTER */
        .footer { border-top: 1px solid var(--line); padding: 50px 0 24px; background: var(--bg-soft); }
        .footer-grid { display: grid; grid-template-columns: 2.5fr 1fr 1fr 1fr; gap: clamp(24px, 4vw, 60px); margin-bottom: 40px; }
        .footer-brand p { color: var(--muted); font-size: .85rem; max-width: 260px; line-height: 1.7; margin-top: 12px; }
        .footer-col h4 { font-family: 'JetBrains Mono', monospace; font-size: .72rem; font-weight: 500; color: var(--ink); margin-bottom: 16px; letter-spacing: .1em; text-transform: uppercase; }
        .footer-col li { margin-bottom: 9px; }
        .footer-col a { color: var(--muted); font-size: .85rem; } .footer-col a:hover { color: var(--accent); }
        .footer-bottom { display: flex; justify-content: space-between; align-items: center; padding-top: 20px; border-top: 1px solid var(--line); font-size: .75rem; color: var(--muted); font-family: 'JetBrains Mono', monospace; }

        /* BACK TO TOP */
        .back-top { position: fixed; bottom: 28px; right: 28px; width: 44px; height: 44px; border-radius: 12px; background: var(--card); border: 1px solid var(--line); box-shadow: var(--shadow); display: flex; align-items: center; justify-content: center; cursor: pointer; z-index: 998; opacity: 0; transform: translateY(16px); transition: all 0.3s ease; pointer-events: none; }
        .back-top.show { opacity: 1; transform: translateY(0); pointer-events: auto; }
        .back-top:hover { border-color: var(--accent); background: var(--accent-light); }

        .reveal { opacity: 0; transform: translateY(24px); transition: all 0.6s cubic-bezier(.22, 1, .36, 1); }
        .reveal.show { opacity: 1; transform: translateY(0); }
        .reveal-d1 { transition-delay: .1s; } .reveal-d2 { transition-delay: .2s; } .reveal-d3 { transition-delay: .3s; }

        @media(max-width:1024px) {
            .faq-list { grid-template-columns: 1fr; }
            .feat-row { grid-template-columns: 1fr 1fr; }
            .tool-grid { grid-template-columns: 1fr 1fr; }
            .comm-grid { grid-template-columns: 1fr; }
            .contact-grid { grid-template-columns: 1fr 1fr; }
            .footer-grid { grid-template-columns: 1fr 1fr; }
        }
        @media(max-width:768px) {
            .nav-right a:not(.nav-right a.active) { display: none; }
            .nav-right a.active { display: block; }
            .mobile-btn { display: block; }
            .feat-row { grid-template-columns: 1fr; }
            .tool-grid { grid-template-columns: 1fr; }
            .contact-grid { grid-template-columns: 1fr; }
            .footer-grid { grid-template-columns: 1fr; }
            .footer-bottom { flex-direction: column; gap: 6px; text-align: center; }
            .ch-count { display: none; }
            .fl-answer-inner { padding-left: 20px; }
            .search-kbd { display: none; }
        }