/**
 * PingTest.in — Responsive Breakpoints
 * Mobile-friendly layout adjustments across device sizes.
 */

/* ========================================
   Mobile (max-width: 639px)
   ======================================== */

@media (max-width: 639px) {
    .container {
        padding-left: var(--spacing-md);
        padding-right: var(--spacing-md);
    }

    .section {
        padding-top: var(--spacing-2xl);
        padding-bottom: var(--spacing-2xl);
    }

    /* Mobile Navigation */
    .nav-toggle {
        display: flex;
    }

    .site-nav {
        position: fixed;
        top: var(--header-height);
        left: 0;
        right: 0;
        background: var(--color-bg);
        border-bottom: 1px solid var(--color-border);
        box-shadow: var(--shadow-lg);
        transform: translateY(-100%);
        opacity: 0;
        visibility: hidden;
        transition: transform var(--transition-normal), opacity var(--transition-normal), visibility var(--transition-normal);
        z-index: 99;
    }

    .site-nav.open {
        transform: translateY(0);
        opacity: 1;
        visibility: visible;
    }

    .nav-links {
        flex-direction: column;
        padding: var(--spacing-md);
        gap: var(--spacing-xs);
    }

    .nav-link {
        width: 100%;
        padding: var(--spacing-md);
    }

    /* Hero */
    .hero {
        padding: var(--spacing-2xl) 0;
    }

    .hero-title {
        font-size: var(--font-size-2xl);
    }

    .hero-subtitle {
        font-size: var(--font-size-base);
    }

    .hero-note {
        font-size: var(--font-size-xs);
    }

    /* Ping Tool */
    .ping-tool {
        padding: var(--spacing-lg);
        border-radius: var(--radius-lg);
    }

    .ping-tool-header {
        flex-direction: column;
        align-items: flex-start;
    }

    .ping-tool-title h2 {
        font-size: var(--font-size-lg);
    }

    /* Results */
    .results-grid {
        grid-template-columns: repeat(2, 1fr);
    }

    .stat-card-status {
        grid-column: span 2;
    }

    .stat-value {
        font-size: var(--font-size-xl);
    }

    .samples-visualization {
        height: 80px;
    }

    .samples-legend {
        gap: var(--spacing-md);
    }

    /* Grids */
    .info-grid {
        grid-template-columns: 1fr;
    }

    .tools-grid {
        grid-template-columns: 1fr;
        gap: var(--spacing-md);
    }

    .section-title {
        font-size: var(--font-size-xl);
    }

    .section-subtitle {
        font-size: var(--font-size-base);
    }

    /* FAQ */
    .faq-question {
        padding: var(--spacing-md) var(--spacing-lg);
        font-size: var(--font-size-sm);
    }

    .faq-answer p, .faq-answer ul {
        padding: 0 var(--spacing-lg);
        font-size: var(--font-size-xs);
    }

    .faq-answer ul {
        padding-left: calc(var(--spacing-lg) + var(--spacing-md));
    }

    /* Footer */
    .footer-main {
        grid-template-columns: 1fr;
        gap: var(--spacing-xl);
    }

    .footer-bottom {
        flex-direction: column;
        text-align: center;
    }

    .error-page {
        padding: var(--spacing-2xl) var(--spacing-md);
    }

    .error-page-title {
        font-size: var(--font-size-xl);
    }
}

/* ========================================
   Tablet (640px - 1023px)
   ======================================== */

@media (min-width: 640px) and (max-width: 1023px) {
    .nav-toggle {
        display: flex;
    }

    .site-nav {
        position: fixed;
        top: var(--header-height);
        left: 0;
        right: 0;
        background: var(--color-bg);
        border-bottom: 1px solid var(--color-border);
        box-shadow: var(--shadow-lg);
        transform: translateY(-100%);
        opacity: 0;
        visibility: hidden;
        transition: transform var(--transition-normal), opacity var(--transition-normal), visibility var(--transition-normal);
        z-index: 99;
    }

    .site-nav.open {
        transform: translateY(0);
        opacity: 1;
        visibility: visible;
    }

    .nav-links {
        flex-direction: column;
        padding: var(--spacing-md);
        gap: var(--spacing-xs);
    }

    .nav-link {
        width: 100%;
        padding: var(--spacing-md);
    }

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

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

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

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

/* ========================================
   Desktop (1024px and up)
   ======================================== */

@media (min-width: 1024px) {
    .hero-title {
        font-size: var(--font-size-4xl);
    }

    .section {
        padding-top: var(--spacing-3xl);
        padding-bottom: var(--spacing-3xl);
    }
}

/* ========================================
   Large Desktop (1200px and up)
   ======================================== */

@media (min-width: 1200px) {
    .container {
        padding-left: var(--spacing-xl);
        padding-right: var(--spacing-xl);
    }
}

/* ========================================
   Print Styles
   ======================================== */

@media print {
    .site-header,
    .site-footer,
    .nav-toggle,
    .ping-controls,
    .ping-progress,
    .ad-placement {
        display: none !important;
    }

    body {
        color: #000;
        background: #fff;
    }

    .hero {
        background: none;
    }

    .card,
    .stat-card,
    .info-card,
    .tool-card,
    .faq-item {
        box-shadow: none;
        border: 1px solid #ccc;
    }
}