/* ============================================
   gzcangshu.com - Responsive Stylesheet
   Mobile-first responsive design
   ============================================ */

/* Tablet & Mobile */
@media (max-width: 1280px) {
    .grid-4 {
        grid-template-columns: repeat(2, 1fr);
    }

    .bento-grid {
        grid-template-columns: repeat(4, 1fr);
    }

    .bento-item.span-2 { grid-column: span 2; }
    .bento-item.span-3 { grid-column: span 4; }
    .bento-item.span-4 { grid-column: span 4; }
    .bento-item.span-6 { grid-column: span 4; }

    .footer-grid {
        grid-template-columns: 1.4fr 1fr 1fr;
    }

    .footer-grid .footer-col:last-child {
        grid-column: span 3;
        margin-top: var(--space-lg);
    }

    .hero-stats {
        grid-template-columns: repeat(2, 1fr);
        gap: var(--space-xl);
    }
}

@media (max-width: 1024px) {
    .nav-menu {
        display: none;
    }

    .mobile-menu-toggle {
        display: inline-flex;
    }

    .lang-switch {
        display: none;
    }

    .hero {
        min-height: 90vh;
        padding: 8rem 0 4rem;
    }

    .hero-visual {
        display: none;
    }

    .grid-3 {
        grid-template-columns: repeat(2, 1fr);
    }

    .grid-2 {
        grid-template-columns: 1fr;
    }

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

    .bento-item.span-2,
    .bento-item.span-3,
    .bento-item.span-4,
    .bento-item.span-6 {
        grid-column: span 2;
    }

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

    .footer-grid .footer-col:first-child {
        grid-column: span 2;
    }

    .footer-grid .footer-col:last-child {
        grid-column: span 2;
        margin-top: 0;
    }

    .section {
        padding: var(--space-4xl) 0;
    }
}

@media (max-width: 768px) {
    :root {
        --space-xl: 1.25rem;
        --space-2xl: 2rem;
        --space-3xl: 3rem;
        --space-4xl: 4rem;
        --space-5xl: 5rem;
    }

    .container,
    .container-narrow,
    .container-wide {
        padding: 0 var(--space-md);
    }

    .grid-2,
    .grid-3,
    .grid-4 {
        grid-template-columns: 1fr;
    }

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

    .bento-item,
    .bento-item.span-2,
    .bento-item.span-3,
    .bento-item.span-4,
    .bento-item.span-6 {
        grid-column: span 1;
    }

    .hero {
        min-height: 85vh;
        padding: 7rem 0 3rem;
    }

    .hero-actions {
        width: 100%;
    }

    .hero-actions .btn {
        flex: 1;
        min-width: 0;
        justify-content: center;
    }

    .hero-stats {
        grid-template-columns: repeat(2, 1fr);
        gap: var(--space-lg);
    }

    .stat-value {
        font-size: 1.75rem;
    }

    .footer-grid {
        grid-template-columns: 1fr;
        gap: var(--space-2xl);
    }

    .footer-grid .footer-col:first-child,
    .footer-grid .footer-col:last-child {
        grid-column: span 1;
    }

    .footer-bottom {
        flex-direction: column;
        align-items: flex-start;
        text-align: left;
    }

    .page-header {
        padding: 8rem 0 3rem;
    }

    .section-eyebrow {
        font-size: 0.75rem;
    }

    .btn {
        padding: 0.75rem 1.5rem;
        font-size: 0.875rem;
    }

    .card {
        padding: var(--space-xl);
    }

    .nav-wrapper {
        gap: var(--space-md);
    }

    .nav-brand {
        font-size: 1.125rem;
    }
}

@media (max-width: 640px) {
    h1 {
        font-size: clamp(2rem, 8vw, 3rem);
    }

    h2 {
        font-size: clamp(1.625rem, 6vw, 2.25rem);
    }

    h3 {
        font-size: clamp(1.25rem, 5vw, 1.75rem);
    }

    .hero-stats {
        grid-template-columns: 1fr;
        gap: var(--space-md);
    }

    .section {
        padding: var(--space-3xl) 0;
    }

    .card {
        padding: var(--space-lg);
    }

    .hero-actions {
        flex-direction: column;
        align-items: stretch;
    }

    .hero-actions .btn {
        width: 100%;
    }

    .footer-legal {
        flex-direction: column;
        gap: var(--space-sm);
        align-items: flex-start;
    }
}

@media (max-width: 480px) {
    .stat-value {
        font-size: 1.5rem;
    }

    .stat-label {
        font-size: 0.6875rem;
    }

    .card-icon {
        width: 48px;
        height: 48px;
    }

    .card-icon svg {
        width: 24px;
        height: 24px;
    }

    .nav-brand {
        font-size: 1rem;
    }

    .nav-brand .logo-mark {
        width: 32px;
        height: 32px;
    }
}

/* Large screens */
@media (min-width: 1600px) {
    :root {
        --space-5xl: 10rem;
        --space-4xl: 8rem;
    }
}

@media (min-width: 1920px) {
    .container,
    .container-narrow,
    .container-wide {
        padding: 0 var(--space-2xl);
    }
}

/* Print styles */
@media print {
    .site-header,
    .site-footer,
    .mobile-menu-toggle,
    .lang-switch {
        display: none;
    }

    body {
        background: white;
        color: black;
    }

    a {
        text-decoration: underline;
    }
}

/* High DPI / Retina */
@media (-webkit-min-device-pixel-ratio: 2), (min-resolution: 192dpi) {
    /* Retina-specific styles */
}

/* Landscape mobile */
@media (max-height: 500px) and (orientation: landscape) {
    .hero {
        min-height: 100vh;
        padding: 6rem 0 2rem;
    }
}

/* Touch device adjustments */
@media (hover: none) {
    .hover-lift:hover,
    .hover-scale:hover,
    .hover-tilt:hover {
        transform: none;
    }

    .cursor-dot,
    .cursor-ring {
        display: none;
    }
}

/* Wide screen optimizations */
@media (min-width: 2000px) {
    html {
        font-size: 18px;
    }
}