/* ============ VARIABLES ============ */
    html {
        scroll-behavior: smooth;
    }

    .tkb-guide {
        /* Teal scale */
        --teal-950: #042f2e;
        --teal-900: #134e4a;
        --teal-800: #115e59;
        --teal-700: #0f766e;
        --teal-600: #0d9488;
        --teal-500: #14b8a6;
        --teal-300: #5eead4;
        --teal-100: #ccfbf1;
        --teal-50: #f0fdfa;
        /* Accents */
        --amber: #f59e0b;
        --amber-soft: #fffbeb;
        --amber-border: #fde68a;
        --amber-text: #92400e;
        --indigo: #6366f1;
        --indigo-dark: #4f46e5;
        --indigo-soft: #f5f6ff;
        --indigo-border: #e0e3ff;
        /* Neutrals */
        --text-heading: #0f2a2a;
        --text-body: #334155;
        --text-muted: #5b6b7b;
        --bg-card: #ffffff;
        --border-color: #dcebe8;
        --radius-lg: 24px;
        --radius-md: 14px;
        --radius-sm: 10px;
        --shadow-sm: 0 1px 2px rgba(4, 47, 46, 0.04), 0 2px 8px rgba(4, 47, 46, 0.04);
        --shadow-md: 0 14px 30px -10px rgba(15, 118, 110, 0.22);
        max-width: 1080px;
        margin: 0 auto;
        padding: 32px 20px 72px;
        color: var(--text-body);
        font-family: system-ui, -apple-system, "Segoe UI", Roboto, sans-serif;
        line-height: 1.55;
        background: radial-gradient(900px 400px at 100% -50px, rgba(20, 184, 166, 0.10), transparent 60%), radial-gradient(700px 360px at -10% 30%, rgba(99, 102, 241, 0.05), transparent 60%);
    }

    /* ============ HERO ============ */
    .guide-hero {
        position: relative;
        overflow: hidden;
        display: flex;
        align-items: center;
        justify-content: space-between;
        gap: 28px;
        padding: 42px 44px;
        border-radius: var(--radius-lg);
        background: linear-gradient(125deg, var(--teal-950) 0%, var(--teal-800) 50%, var(--teal-600) 100%);
        color: #fff;
        box-shadow: 0 24px 44px -18px rgba(13, 148, 136, 0.55);
    }

        .guide-hero::before,
        .guide-hero::after {
            content: "";
            position: absolute;
            border-radius: 50%;
            pointer-events: none;
        }

        .guide-hero::before {
            width: 340px;
            height: 340px;
            right: -90px;
            top: -140px;
            background: radial-gradient(circle, rgba(94, 234, 212, 0.35), transparent 68%);
        }

        .guide-hero::after {
            width: 220px;
            height: 220px;
            left: 38%;
            bottom: -130px;
            background: radial-gradient(circle, rgba(251, 191, 36, 0.22), transparent 70%);
        }

    .hero-content,
    .hero-action {
        position: relative;
        z-index: 1;
    }

    .hero-badge {
        display: inline-flex;
        align-items: center;
        gap: 8px;
        padding: 6px 12px;
        margin-bottom: 14px;
        font-size: 11px;
        font-weight: 700;
        letter-spacing: 0.09em;
        color: var(--teal-100);
        background: rgba(255, 255, 255, 0.12);
        border: 1px solid rgba(255, 255, 255, 0.2);
        border-radius: 999px;
    }

    .guide-hero h1 {
        margin: 0 0 12px;
        font-size: clamp(26px, 3.6vw, 36px);
        font-weight: 800;
        line-height: 1.2;
        letter-spacing: -0.02em;
    }

    .hero-copy {
        margin: 0;
        max-width: 560px;
        font-size: 15px;
        line-height: 1.65;
        color: #d1f5ef;
    }

    .hero-action {
        display: inline-flex;
        align-items: center;
        gap: 10px;
        white-space: nowrap;
        padding: 15px 26px;
        border-radius: var(--radius-md);
        background: linear-gradient(135deg, #fde68a, #fbbf24);
        color: var(--teal-950);
        font-size: 14px;
        font-weight: 800;
        text-decoration: none;
        box-shadow: 0 10px 22px -6px rgba(245, 158, 11, 0.55);
        transition: transform 0.2s ease, box-shadow 0.2s ease;
    }

        .hero-action:hover {
            transform: translateY(-3px);
            box-shadow: 0 16px 28px -8px rgba(245, 158, 11, 0.65);
            color: var(--teal-950);
        }

        .hero-action:focus-visible {
            outline: 3px solid #fff;
            outline-offset: 3px;
        }

    /* ============ QUICK NAV ============ */
    .guide-index {
        position: sticky;
        top: 12px;
        z-index: 10;
        display: flex;
        align-items: center;
        flex-wrap: wrap;
        gap: 8px;
        margin: 24px 0 40px;
        padding: 10px 14px;
        border: 1px solid var(--border-color);
        border-radius: 18px;
        background: rgba(255, 255, 255, 0.88);
        backdrop-filter: blur(14px);
        -webkit-backdrop-filter: blur(14px);
        box-shadow: 0 10px 28px -12px rgba(15, 118, 110, 0.28);
    }

    .index-label {
        margin: 0 8px 0 4px;
        font-size: 11px;
        font-weight: 800;
        letter-spacing: 0.08em;
        color: var(--teal-700);
    }

    .guide-index a {
        display: inline-flex;
        align-items: center;
        min-height: 38px;
        padding: 8px 14px;
        border: 1px solid transparent;
        border-radius: 999px;
        background: var(--teal-50);
        color: var(--teal-800);
        font-size: 13px;
        font-weight: 700;
        text-decoration: none;
        transition: all 0.18s ease;
    }

        .guide-index a:hover {
            background: var(--teal-600);
            color: #fff;
            transform: translateY(-2px);
            box-shadow: 0 8px 16px -6px rgba(13, 148, 136, 0.55);
        }

        .guide-index a:focus-visible {
            outline: 3px solid var(--teal-300);
            outline-offset: 2px;
        }

    /* ============ SECTIONS ============ */
    .guide-section {
        margin-bottom: 48px;
        scroll-margin-top: 90px;
    }

    .section-heading {
        display: flex;
        align-items: center;
        gap: 16px;
        margin-bottom: 18px;
    }

    .step-number {
        display: grid;
        place-items: center;
        min-width: 54px;
        height: 50px;
        padding: 0 12px;
        border-radius: var(--radius-md);
        background: linear-gradient(135deg, var(--teal-500), var(--teal-700));
        color: #fff;
        font-size: 16px;
        font-weight: 800;
        letter-spacing: 0.02em;
        box-shadow: 0 8px 16px -6px rgba(13, 148, 136, 0.55);
    }

    .section-kicker {
        margin: 0 0 2px;
        font-size: 11px;
        font-weight: 800;
        letter-spacing: 0.1em;
        color: var(--teal-600);
    }

    .section-heading h2 {
        margin: 0;
        font-size: 21px;
        font-weight: 700;
        color: var(--text-heading);
    }

    /* ============ CARDS ============ */
    .step-card,
    .choice-card,
    .rule-card,
    .finish-card {
        border: 1px solid var(--border-color);
        border-radius: var(--radius-md);
        background: var(--bg-card);
        box-shadow: var(--shadow-sm);
        transition: transform 0.2s ease, box-shadow 0.2s ease, border-color 0.2s ease;
    }

    .step-card {
        padding: 26px;
        border-top: 3px solid var(--teal-500);
    }

    .card-intro {
        margin: 0 0 14px;
    }

    /* ============ LISTS & LINKS ============ */
    .action-list {
        margin: 0;
        padding-left: 0;
        list-style: none;
        counter-reset: step;
        line-height: 1.7;
    }

        .action-list li {
            position: relative;
            margin-bottom: 10px;
            padding-left: 36px;
            counter-increment: step;
        }

            .action-list li::before {
                content: counter(step);
                position: absolute;
                left: 0;
                top: 2px;
                display: grid;
                place-items: center;
                width: 24px;
                height: 24px;
                border-radius: 50%;
                background: var(--teal-100);
                color: var(--teal-800);
                font-size: 12px;
                font-weight: 800;
            }

            .action-list li:last-child {
                margin-bottom: 0;
            }

        .action-list strong {
            color: var(--teal-800);
            font-weight: 700;
        }

    .step-link {
        display: inline-flex;
        align-items: center;
        gap: 4px;
        margin-top: 20px;
        padding: 9px 16px;
        border-radius: 999px;
        background: var(--teal-50);
        border: 1px solid var(--teal-100);
        color: var(--teal-700);
        font-size: 14px;
        font-weight: 700;
        text-decoration: none;
        transition: all 0.2s ease;
        align-self: flex-start;
    }

        .step-link i {
            font-size: 18px;
        }

        .step-link:hover {
            background: var(--teal-600);
            border-color: var(--teal-600);
            color: #fff;
            gap: 8px;
        }

        .step-link:focus-visible,
        .rule-body a:focus-visible {
            outline: 3px solid var(--teal-300);
            outline-offset: 2px;
        }

    /* ============ STEP 02 ============ */
    .mini-flow {
        display: flex;
        align-items: center;
        flex-wrap: wrap;
        gap: 12px;
        margin: 16px 0 20px;
    }

    .flow-item {
        display: inline-flex;
        align-items: center;
        gap: 8px;
        padding: 10px 16px;
        border: 1px solid var(--teal-100);
        border-radius: var(--radius-sm);
        background: var(--teal-50);
        color: var(--teal-900);
        font-size: 14px;
        font-weight: 600;
    }

        .flow-item i {
            color: var(--teal-600);
        }

    .flow-arrow {
        font-size: 14px;
        color: var(--teal-500);
    }

    .hint-box {
        display: flex;
        align-items: flex-start;
        gap: 12px;
        padding: 14px 16px;
        border: 1px solid var(--amber-border);
        border-left: 4px solid var(--amber);
        border-radius: var(--radius-sm);
        background: var(--amber-soft);
        color: var(--amber-text);
        font-size: 14px;
        line-height: 1.55;
    }

    .hint-icon {
        flex-shrink: 0;
        margin-top: 1px;
        font-size: 18px;
        color: var(--amber);
    }

    /* ============ STEP 03 ============ */
    .choice-grid {
        display: grid;
        grid-template-columns: repeat(2, minmax(0, 1fr));
        gap: 18px;
    }

    .choice-card {
        display: flex;
        flex-direction: column;
        padding: 26px;
        background: linear-gradient(180deg, var(--teal-50), #fff 55%);
        border-top: 3px solid var(--teal-500);
    }

    .choice-card-alt {
        background: linear-gradient(180deg, var(--indigo-soft), #fff 55%);
        border-color: var(--indigo-border);
        border-top-color: var(--indigo);
    }

    .choice-card:hover {
        transform: translateY(-3px);
        box-shadow: var(--shadow-md);
    }

    .choice-tag {
        align-self: flex-start;
        margin-bottom: 10px;
        padding: 4px 10px;
        border-radius: 999px;
        background: var(--teal-100);
        color: var(--teal-800);
        font-size: 11px;
        font-weight: 800;
        letter-spacing: 0.07em;
    }

    .tag-purple {
        background: #e5e7ff;
        color: var(--indigo-dark);
    }

    .choice-card h3,
    .rule-card h3,
    .finish-card h3 {
        margin: 0 0 10px;
        font-size: 17px;
        font-weight: 700;
        color: var(--text-heading);
    }

    .compact {
        flex-grow: 1;
        font-size: 14px;
    }

    .choice-card-alt .action-list li::before {
        background: #e5e7ff;
        color: var(--indigo-dark);
    }

    .choice-card-alt .action-list strong {
        color: var(--indigo-dark);
    }

    .choice-card-alt .step-link {
        background: #eef0ff;
        border-color: var(--indigo-border);
        color: var(--indigo-dark);
    }

        .choice-card-alt .step-link:hover {
            background: var(--indigo);
            border-color: var(--indigo);
            color: #fff;
        }

    /* ============ STEP 04–07 ============ */
    .rule-list,
    .finish-steps {
        position: relative;
        display: grid;
        gap: 14px;
    }

    .rule-card,
    .finish-card {
        display: flex;
        gap: 18px;
        padding: 20px 22px;
    }

    .rule-card {
        border-left: 4px solid var(--teal-500);
    }

        .rule-card:hover,
        .finish-card:hover {
            transform: translateY(-2px);
            border-color: var(--teal-300);
            box-shadow: var(--shadow-md);
        }

    .rule-number {
        display: grid;
        place-items: center;
        flex-shrink: 0;
        width: 44px;
        height: 44px;
        border-radius: var(--radius-sm);
        background: var(--teal-100);
        color: var(--teal-800);
        font-size: 14px;
        font-weight: 800;
    }

    .rule-body p,
    .finish-card p {
        margin: 0;
        font-size: 14px;
        line-height: 1.65;
        color: var(--text-muted);
    }

    .rule-body strong,
    .finish-card strong {
        color: var(--teal-800);
    }

    .rule-body a {
        display: inline-flex;
        align-items: center;
        gap: 4px;
        margin-top: 10px;
        font-size: 13px;
        font-weight: 700;
        color: var(--teal-700);
        text-decoration: none;
    }

        .rule-body a:hover {
            color: var(--teal-900);
            text-decoration: underline;
        }

    /* ============ STEP 09–11 ============ */
    .finish-card {
        border-left: 4px solid var(--amber);
    }

    .finish-badge {
        display: grid;
        place-items: center;
        flex-shrink: 0;
        width: 44px;
        height: 44px;
        border-radius: 50%;
        background: linear-gradient(135deg, var(--teal-500), var(--teal-700));
        color: #fff;
        font-size: 14px;
        font-weight: 800;
        box-shadow: 0 6px 12px -4px rgba(13, 148, 136, 0.5);
    }

    /* ============ FOOTER ============ */
    .guide-footer {
        display: flex;
        align-items: center;
        gap: 16px;
        margin-top: 12px;
        padding: 24px 28px;
        border-radius: var(--radius-md);
        background: linear-gradient(120deg, var(--teal-50), #e6fbf6);
        border: 1px solid var(--teal-100);
        color: var(--teal-900);
    }

    .footer-icon {
        display: flex;
        align-items: center;
        font-size: 30px;
        color: var(--teal-600);
    }

    .guide-footer div {
        display: flex;
        flex-direction: column;
        gap: 2px;
    }

    .guide-footer strong {
        font-size: 16px;
    }

    .guide-footer span {
        font-size: 14px;
        color: var(--teal-700);
    }

    /* ============ RESPONSIVE ============ */
    @media (max-width: 768px) {
        .tkb-guide {
            padding: 16px 12px 44px;
        }

        .guide-hero {
            flex-direction: column;
            align-items: flex-start;
            gap: 22px;
            padding: 28px 24px;
        }

        .hero-action {
            width: 100%;
            justify-content: center;
        }

        .guide-index {
            position: relative;
            top: 0;
            margin-bottom: 32px;
        }

        .choice-grid {
            grid-template-columns: 1fr;
        }

        .rule-card,
        .finish-card {
            flex-direction: column;
            gap: 12px;
        }

        .mini-flow {
            flex-direction: column;
            align-items: stretch;
        }

        .flow-arrow {
            align-self: center;
            transform: rotate(90deg);
        }
    }

    /* ============ ACCESSIBILITY ============ */
    @media (prefers-reduced-motion: reduce) {
        html {
            scroll-behavior: auto;
        }

        .tkb-guide * {
            transition: none !important;
        }
    }