/* ============================================
   HeliosDB - Responsive Design
   ============================================ */

/* Tablet Landscape (< 1200px) */
@media (max-width: 1199px) {
    :root {
        --section-padding: 80px;
    }

    .hero-title {
        font-size: 3.25rem;
    }

    .section-title {
        font-size: 2.5rem;
    }

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

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

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

    .footer-grid {
        grid-template-columns: 1.5fr repeat(2, 1fr);
        gap: 32px;
    }

    .footer-links:nth-child(n+4) {
        grid-column: span 1;
    }
}

/* Tablet Portrait (< 960px) */
@media (max-width: 959px) {
    .tiers-grid {
        grid-template-columns: 1fr;
        max-width: 500px;
        margin: 0 auto;
    }

    .pricing-grid {
        grid-template-columns: 1fr;
        max-width: 440px;
        margin: 0 auto;
    }

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

    .dev-info-panel {
        display: grid;
        grid-template-columns: repeat(2, 1fr);
    }

    .investor-content {
        grid-template-columns: 1fr;
    }
}

/* Mobile Landscape / Small Tablet (< 810px) */
@media (max-width: 809px) {
    :root {
        --section-padding: 64px;
    }

    /* Nav */
    .nav-links {
        display: none;
        position: fixed;
        top: 64px;
        left: 0;
        right: 0;
        bottom: 0;
        background: rgba(0, 0, 0, 0.97);
        backdrop-filter: blur(20px);
        flex-direction: column;
        align-items: center;
        justify-content: center;
        gap: 24px;
        z-index: 999;
    }

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

    .nav-link {
        font-size: 1.25rem;
    }

    .nav-hamburger {
        display: flex;
    }

    .nav-actions {
        display: none;
    }

    /* Hero */
    .hero {
        padding: 100px 20px 40px;
        min-height: auto;
    }

    .hero-title {
        font-size: 2.5rem;
    }

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

    .hero-ctas {
        flex-direction: column;
        gap: 12px;
    }

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

    .hero-code {
        max-width: 100%;
    }

    .code-block {
        font-size: 0.75rem;
    }

    .hero-stats {
        flex-wrap: wrap;
        gap: 20px;
    }

    .stat-divider {
        display: none;
    }

    .stat {
        width: calc(50% - 10px);
    }

    /* Section headers */
    .section-title {
        font-size: 2rem;
    }

    .section-subtitle {
        font-size: 1rem;
    }

    /* Features */
    .features-grid {
        grid-template-columns: 1fr;
    }

    /* Comparison */
    .comparison-strip {
        overflow-x: auto;
        padding: 40px 0;
    }

    .comparison-table {
        min-width: 600px;
        font-size: 0.8125rem;
    }

    /* Use cases */
    .uc-filters {
        justify-content: flex-start;
        overflow-x: auto;
        flex-wrap: nowrap;
        padding-bottom: 8px;
        -webkit-overflow-scrolling: touch;
    }

    .uc-filter {
        white-space: nowrap;
        flex-shrink: 0;
    }

    .uc-grid {
        grid-template-columns: repeat(2, 1fr);
        gap: 12px;
    }

    /* Dev section */
    .dev-info-panel {
        grid-template-columns: 1fr;
    }

    .dev-tabs {
        overflow-x: auto;
    }

    /* Investors */
    .investor-metrics {
        grid-template-columns: repeat(2, 1fr);
    }

    .metric-value {
        font-size: 2rem;
    }

    /* CTA */
    .cta-title {
        font-size: 2rem;
    }

    .cta-buttons {
        flex-direction: column;
        gap: 12px;
    }

    .cta-buttons .btn {
        width: 100%;
        justify-content: center;
    }

    /* Footer */
    .footer-grid {
        grid-template-columns: 1fr 1fr;
        gap: 32px;
    }

    .footer-brand {
        grid-column: 1 / -1;
    }
}

/* Mobile Portrait (< 480px) */
@media (max-width: 479px) {
    :root {
        --section-padding: 48px;
    }

    .container {
        padding: 0 16px;
    }

    .hero-title {
        font-size: 2rem;
    }

    .hero-subtitle br {
        display: none;
    }

    .section-title {
        font-size: 1.75rem;
    }

    .section-title br {
        display: none;
    }

    .hero-stats {
        gap: 16px;
    }

    .stat-value {
        font-size: 1.375rem;
    }

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

    .uc-card {
        padding: 16px;
    }

    .investor-metrics {
        grid-template-columns: 1fr;
    }

    .metric-card {
        padding: 24px 16px;
    }

    .feature-card {
        padding: 24px;
    }

    .tier-header,
    .tier-features,
    .tier-target {
        padding-left: 20px;
        padding-right: 20px;
    }

    .tier-stats {
        padding: 20px;
    }

    .tier-card > .tier-desc {
        padding: 12px 20px 0;
    }

    .pricing-card {
        padding: 28px 20px;
    }

    .footer-grid {
        grid-template-columns: 1fr;
        gap: 24px;
    }

    .cta-title {
        font-size: 1.75rem;
    }
}