:root {
        --primary: #6366f1;
        --primary-dark: #4f46e5;
        --success: #10b981;
        --warning: #f59e0b;
        --danger: #ef4444;
        --dark: #0f172a;
        --dark-light: #1e293b;
        --border: #334155;
        --text: #e2e8f0;
        --text-muted: #475569;
        --glass: rgba(255, 255, 255, 0.03);
        --radius: 16px;
        --shadow: 0 25px 50px -12px rgba(0, 0, 0, 0.5);
    }

    .tool-app {
        background: linear-gradient(135deg, var(--dark) 0%, #1a1a2e 100%);
        border-radius: var(--radius);
        padding: 2rem;
        margin: 2rem auto;
        max-width: 900px;
        box-shadow: var(--shadow);
        border: 1px solid var(--border);
    }

    .tool-header {
        text-align: center;
        margin-bottom: 2rem;
    }

    .tool-header h1 {
        color: #fff;
        font-size: 1.75rem;
        margin-bottom: 0.5rem;
        background: linear-gradient(135deg, #fff, var(--primary));
        -webkit-background-clip: text;
        -webkit-text-fill-color: transparent;
    }

    .tool-header p {
        color: var(--text-muted);
        font-size: 1rem;
    }

    .search-form {
        background: var(--glass);
        border: 1px solid var(--border);
        border-radius: var(--radius);
        padding: 1.5rem;
        margin-bottom: 1.5rem;
    }

    .form-grid {
        display: grid;
        grid-template-columns: 1fr;
        gap: 1rem;
    }

    @media (min-width: 768px) {
        .form-grid {
            grid-template-columns: 1fr 1fr;
        }

        .form-grid .full-width {
            grid-column: 1 / -1;
        }
    }

    .form-group {
        display: flex;
        flex-direction: column;
        gap: 0.5rem;
    }

    .form-group label {
        color: var(--text);
        font-size: 0.875rem;
        font-weight: 600;
        display: flex;
        align-items: center;
        gap: 0.5rem;
    }

    .form-group label .icon {
        font-size: 1.1rem;
    }

    .form-group input {
        background: var(--dark);
        border: 1px solid var(--border);
        color: var(--text);
        padding: 0.875rem 1rem;
        border-radius: 10px;
        font-size: 0.95rem;
        transition: all 0.2s;
    }

    .form-group input:focus {
        border-color: var(--primary);
        outline: none;
        box-shadow: 0 0 0 3px rgba(99, 102, 241, 0.2);
    }

    .form-group input::placeholder {
        color: var(--text-muted);
    }

    .form-group .hint {
        font-size: 0.7rem;
        color: var(--text-muted);
    }

    .btn {
        display: inline-flex;
        align-items: center;
        justify-content: center;
        gap: 0.5rem;
        padding: 1rem 2rem;
        border-radius: 10px;
        font-weight: 600;
        font-size: 1rem;
        border: none;
        cursor: pointer;
        transition: all 0.2s;
        width: 100%;
    }

    .btn-primary {
        background: linear-gradient(135deg, var(--primary), var(--primary-dark));
        color: #fff;
    }

    .btn-primary:hover {
        transform: translateY(-2px);
        box-shadow: 0 10px 25px rgba(99, 102, 241, 0.4);
    }

    .info-box {
        background: rgba(99, 102, 241, 0.1);
        border: 1px solid rgba(99, 102, 241, 0.3);
        border-radius: 12px;
        padding: 1rem;
        margin-top: 1rem;
        display: flex;
        align-items: flex-start;
        gap: 0.75rem;
        font-size: 0.85rem;
        color: var(--text);
    }

    .info-box .icon {
        color: var(--primary);
        font-size: 1.25rem;
        flex-shrink: 0;
    }

    .info-box p {
        margin: 0;
        line-height: 1.5;
        color: #fff;
    }

    .features-grid {
        display: grid;
        grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
        gap: 1rem;
        margin-top: 1.5rem;
    }

    .feature-card {
        background: var(--glass);
        border: 1px solid var(--border);
        border-radius: 12px;
        padding: 1.25rem;
        text-align: center;
        transition: all 0.3s;
    }

    .feature-card:hover {
        border-color: var(--primary);
        transform: translateY(-3px);
    }

    .feature-card .icon {
        font-size: 2rem;
        margin-bottom: 0.75rem;
    }

    .feature-card h3 {
        color: var(--text);
        font-size: 0.95rem;
        margin: 0 0 0.5rem;
    }

    .feature-card p {
        color: var(--text-muted);
        font-size: 0.8rem;
        margin: 0;
        line-height: 1.4;
    }

    .rank-guide {
        padding: 4rem 0;
        background: #fff;
        color: #1e293b;
    }

    .rank-guide__intro {
        max-width: 850px;
        margin: 0 auto 2rem;
        text-align: center;
    }

    .rank-guide__intro h2 {
        margin: 0 0 1rem;
        font-size: clamp(1.75rem, 4vw, 2.5rem);
        line-height: 1.15;
    }

    .rank-guide__intro p,
    .rank-guide__card p,
    .rank-guide__notes p {
        color: #475569;
        line-height: 1.75;
    }

    .rank-guide__eyebrow {
        margin-bottom: 0.5rem;
        color: #4f46e5 !important;
        font-weight: 700;
        letter-spacing: 0.08em;
        text-transform: uppercase;
    }

    .rank-guide__grid {
        display: grid;
        grid-template-columns: repeat(2, minmax(0, 1fr));
        gap: 1rem;
        margin-bottom: 1rem;
    }

    .rank-guide__card,
    .rank-guide__record,
    .rank-guide__notes {
        padding: 1.5rem;
        border: 1px solid #e2e8f0;
        border-radius: 16px;
        background: #f8fafc;
    }

    .rank-guide__card h3,
    .rank-guide__record h3,
    .rank-guide__notes h3 {
        margin: 0 0 0.75rem;
        color: #0f172a;
    }

    .rank-guide__record {
        margin-bottom: 1rem;
    }

    .rank-guide__record-grid {
        display: grid;
        grid-template-columns: repeat(3, minmax(0, 1fr));
        gap: 0.75rem;
    }

    .rank-guide__record-grid div {
        display: flex;
        flex-direction: column;
        gap: 0.25rem;
        padding: 1rem;
        border-radius: 12px;
        background: #fff;
    }

    .rank-guide__record-grid span {
        color: #64748b;
        line-height: 1.5;
    }

    @media (max-width: 760px) {
        .rank-guide {
            padding: 3rem 0;
        }

        .rank-guide__grid,
        .rank-guide__record-grid {
            grid-template-columns: 1fr;
        }
    }

    .faq-section {
        padding: 3rem 0;
        background: #f8fafc;
    }

    .faq-list {
        max-width: 800px;
        margin: 0 auto;
    }

    .faq-item {
        background: #fff;
        border: 1px solid #e2e8f0;
        border-radius: 12px;
        margin-bottom: 1rem;
        overflow: hidden;
    }

    .faq-question-header {
        padding: 1.25rem;
        cursor: pointer;
        font-weight: 600;
        display: flex;
        justify-content: space-between;
        color: #1e293b;
    }

    .faq-answer {
        padding: 0 1.25rem 1.25rem;
        color: #64748b;
        line-height: 1.7;
    }