/* ============================================
   博天堂 - 响应式设计
   Mobile-First Strategy
   ============================================ */

/* === Tablet (max-width: 1024px) === */
@media (max-width: 1024px) {
    h1 { font-size: 2.2rem; }
    h2 { font-size: 1.8rem; }

    .bv-hero-content h1 { font-size: 2.5rem; }
    .bv-jackpot-counter { font-size: 3rem; }

    .bv-vip-grid {
        grid-template-columns: 1fr;
    }

    .bv-vip-levels {
        flex-direction: row;
        flex-wrap: wrap;
        gap: 10px;
    }

    .bv-vip-levels::before { display: none; }

    .bv-vip-level {
        padding: 10px 15px;
        border: 1px solid #333;
        border-radius: var(--bv-radius);
    }

    .bv-vip-level::before { display: none; }

    .bv-footer-grid {
        grid-template-columns: repeat(2, 1fr);
    }

    .bv-app-section {
        grid-template-columns: 1fr;
        gap: 40px;
        text-align: center;
    }

    .bv-app-mockup img {
        max-width: 280px;
    }

    .bv-license-grid {
        grid-template-columns: 1fr;
    }

    .bv-jackpot-grid {
        grid-template-columns: repeat(2, 1fr);
    }
}

/* === Mobile (max-width: 768px) === */
@media (max-width: 768px) {
    html { font-size: 15px; }

    .bv-navbar-inner {
        height: 60px;
    }

    .bv-nav-links {
        display: none;
        position: fixed;
        top: 60px;
        left: 0;
        width: 100%;
        background: rgba(0,0,0,0.98);
        flex-direction: column;
        padding: 20px;
        gap: 0;
        border-bottom: 1px solid var(--bv-accent);
        max-height: calc(100vh - 60px);
        overflow-y: auto;
    }

    .bv-nav-links.bv-mobile-open {
        display: flex;
    }

    .bv-nav-links li a {
        display: block;
        padding: 15px;
        border-bottom: 1px solid #222;
        font-size: 1rem;
    }

    .bv-hamburger {
        display: flex;
    }

    .bv-nav-actions {
        display: none;
    }

    .bv-hero {
        min-height: 500px;
    }

    .bv-hero-content h1 {
        font-size: 1.8rem;
    }

    .bv-jackpot-counter {
        font-size: 2.2rem;
    }

    .bv-hero-subtitle {
        font-size: 1rem;
    }

    .bv-section {
        padding: 50px 0;
    }

    .bv-section-title h2 {
        font-size: 1.8rem;
    }

    .bv-video-grid {
        grid-template-columns: 1fr;
    }

    .bv-steps {
        grid-template-columns: 1fr;
    }

    .bv-featured-grid {
        grid-template-columns: 1fr;
    }

    .bv-testimonials-grid {
        grid-template-columns: 1fr;
    }

    .bv-perk-list {
        grid-template-columns: 1fr;
    }

    .bv-footer-grid {
        grid-template-columns: 1fr;
        gap: 30px;
    }

    .bv-page-hero {
        height: 300px;
        margin-top: 60px;
    }

    .bv-page-hero-content h1 {
        font-size: 1.8rem;
    }

    .bv-jackpot-grid {
        grid-template-columns: 1fr;
    }

    .bv-jackpot-total .bv-jackpot-amount {
        font-size: 2.2rem;
    }

    .bv-download-buttons {
        flex-direction: column;
        align-items: center;
    }

    .bv-payment-grid {
        grid-template-columns: repeat(3, 1fr);
    }

    .bv-breadcrumb-list {
        font-size: 0.8rem;
        flex-wrap: wrap;
    }
}

/* === Small Mobile (max-width: 480px) === */
@media (max-width: 480px) {
    html { font-size: 14px; }

    .bv-hero-content h1 {
        font-size: 1.5rem;
    }

    .bv-jackpot-counter {
        font-size: 1.8rem;
    }

    .bv-game-card {
        flex: 0 0 180px;
    }

    .bv-game-card img {
        height: 200px;
    }

    .bv-payment-grid {
        grid-template-columns: repeat(2, 1fr);
    }

    .bv-footer-payment {
        grid-template-columns: repeat(2, 1fr);
    }

    .bv-btn {
        padding: 10px 18px;
        font-size: 0.85rem;
    }
}