/* ===== RESPONSIVE DESIGN ===== */

/* Mobile Devices (320px - 767px) */
@media screen and (max-width: 767px) {
    :root {
        --font-size-5xl: 2.5rem;
        --font-size-4xl: 2rem;
        --font-size-3xl: 1.75rem;
        --font-size-2xl: 1.5rem;
        --font-size-xl: 1.125rem;
        --spacing-md: 0.75rem;
        --spacing-lg: 1rem;
        --spacing-xl: 1.5rem;
        --spacing-2xl: 2rem;
        --spacing-3xl: 2.5rem;
        --spacing-4xl: 3rem;
    }

    .container {
        padding: 0 var(--spacing-sm);
    }

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

    .nav-menu {
        position: fixed;
        top: 70px;
        left: -100%;
        width: 100%;
        height: calc(100vh - 70px);
        background-color: var(--bg-primary);
        flex-direction: column;
        padding: var(--spacing-xl);
        gap: var(--spacing-xl);
        transition: left 0.3s ease;
        box-shadow: var(--shadow-lg);
    }

    .nav-menu.active {
        left: 0;
    }

    .nav-menu .nav-link {
        font-size: var(--font-size-lg);
        padding: var(--spacing-md);
        border-bottom: 1px solid var(--border-light);
        width: 100%;
    }

    /* Hero Section */
    .hero .container {
        grid-template-columns: 1fr;
        gap: var(--spacing-2xl);
        text-align: center;
    }

    .hero-title {
        font-size: var(--font-size-4xl);
    }

    .hero-description {
        font-size: var(--font-size-lg);
    }

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

    .btn {
        width: 100%;
        max-width: 300px;
    }

    .hero-image {
        height: 250px;
    }

    .floating-chart {
        height: 200px;
        gap: var(--spacing-sm);
    }

    .chart-bar {
        width: 30px;
    }

    /* Sections */
    section {
        padding: var(--spacing-3xl) 0;
    }

    .section-title {
        font-size: var(--font-size-3xl);
        margin-bottom: var(--spacing-2xl);
    }

    /* Statistics */
    .stats-grid {
        grid-template-columns: repeat(2, 1fr);
        gap: var(--spacing-md);
    }

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

    .stat-number {
        font-size: var(--font-size-4xl);
    }

    /* Articles */
    .articles-grid {
        grid-template-columns: 1fr;
        gap: var(--spacing-xl);
    }

    .article-card {
        max-width: 100%;
    }

    /* Quiz */
    .quiz-options {
        gap: var(--spacing-sm);
    }

    .quiz-option {
        padding: var(--spacing-sm) var(--spacing-md);
        font-size: var(--font-size-sm);
    }

    /* Benefits */
    .benefits-grid {
        grid-template-columns: 1fr;
        gap: var(--spacing-lg);
    }

    /* Partner */
    .partner-card {
        flex-direction: column;
        text-align: center;
        padding: var(--spacing-2xl);
    }

    .partner-logo {
        align-self: center;
        min-width: 120px;
        padding: var(--spacing-lg);
    }

    /* Subscription */
    .subscription-form {
        flex-direction: column;
        gap: var(--spacing-md);
    }

    .subscription-input {
        max-width: 100%;
    }

    /* Trends */
    .trend-item {
        flex-direction: column;
        gap: var(--spacing-md);
        text-align: center;
    }

    .trend-item:not(:last-child)::after {
        display: none;
    }

    .trend-year {
        align-self: center;
        min-width: 80px;
    }

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

    .footer-brand {
        max-width: 100%;
    }

    .footer-section {
        text-align: center;
    }
}

/* Tablet Devices (768px - 1023px) */
@media screen and (min-width: 768px) and (max-width: 1023px) {
    :root {
        --font-size-5xl: 3rem;
        --font-size-4xl: 2.5rem;
        --font-size-3xl: 2rem;
        --spacing-4xl: 4rem;
        --spacing-3xl: 3rem;
    }

    .container {
        padding: 0 var(--spacing-lg);
    }

    /* Hero Section */
    .hero .container {
        gap: var(--spacing-3xl);
    }

    .hero-title {
        font-size: var(--font-size-5xl);
    }

    .hero-image {
        height: 350px;
    }

    .floating-chart {
        height: 250px;
    }

    /* Statistics */
    .stats-grid {
        grid-template-columns: repeat(2, 1fr);
        gap: var(--spacing-lg);
    }

    /* Articles */
    .articles-grid {
        grid-template-columns: repeat(2, 1fr);
        gap: var(--spacing-xl);
    }

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

    /* Footer */
    .footer-content {
        grid-template-columns: repeat(2, 1fr);
        gap: var(--spacing-xl);
    }

    .footer-brand {
        grid-column: 1 / -1;
        text-align: center;
        max-width: 100%;
    }
}

/* Desktop Devices (1024px - 1279px) */
@media screen and (min-width: 1024px) and (max-width: 1279px) {
    .container {
        padding: 0 var(--spacing-lg);
    }

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

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

/* Large Desktop (1280px - 1439px) */
@media screen and (min-width: 1280px) and (max-width: 1439px) {
    .container {
        max-width: var(--container-lg);
    }
}

/* Ultra Large Desktop (1440px+) */
@media screen and (min-width: 1440px) {
    .container {
        max-width: var(--container-2xl);
    }

    /* Hero Section */
    .hero-title {
        font-size: 4rem;
    }

    .hero-description {
        font-size: 1.25rem;
    }

    /* Extra large improvements */
    .stats-grid {
        grid-template-columns: repeat(4, 1fr);
    }

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

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

/* Small Mobile (320px - 374px) */
@media screen and (max-width: 374px) {
    :root {
        --font-size-5xl: 2rem;
        --font-size-4xl: 1.75rem;
        --font-size-3xl: 1.5rem;
        --spacing-md: 0.5rem;
        --spacing-lg: 0.75rem;
        --spacing-xl: 1rem;
        --spacing-2xl: 1.5rem;
        --spacing-3xl: 2rem;
        --spacing-4xl: 2.5rem;
    }

    .nav-brand {
        gap: var(--spacing-xs);
    }

    .brand-text {
        font-size: var(--font-size-lg);
    }

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

    .stat-card {
        padding: var(--spacing-md);
    }

    .btn {
        padding: var(--spacing-sm) var(--spacing-lg);
        font-size: var(--font-size-sm);
    }
}

/* Landscape Orientation Fix for Mobile */
@media screen and (max-height: 500px) and (orientation: landscape) {
    .hero {
        padding: var(--spacing-lg) 0;
    }

    .section-title {
        margin-bottom: var(--spacing-lg);
    }

    section {
        padding: var(--spacing-lg) 0;
    }

    .nav-menu {
        height: calc(100vh - 60px);
        top: 60px;
    }
}

/* High DPI Displays */
@media screen and (-webkit-min-device-pixel-ratio: 2), (min-resolution: 192dpi) {
    /* Better rendering for retina displays */
    .logo, .footer-logo {
        image-rendering: -webkit-optimize-contrast;
        image-rendering: crisp-edges;
    }
}

/* Reduced Motion */
@media (prefers-reduced-motion: reduce) {
    * {
        animation-duration: 0.01ms !important;
        animation-iteration-count: 1 !important;
        transition-duration: 0.01ms !important;
        scroll-behavior: auto !important;
    }
}

/* Dark Mode Support (Future Enhancement) */
@media (prefers-color-scheme: dark) {
    /* This can be enhanced in the future */
    :root {
        --bg-primary: #ffffff;
        --bg-secondary: #f9fafb;
        --text-primary: #1f2937;
        --text-secondary: #6b7280;
    }
}

/* Print Styles */
@media print {
    * {
        background: transparent !important;
        color: black !important;
        box-shadow: none !important;
        text-shadow: none !important;
    }

    .header, .footer, .nav-toggle, .hero-buttons, .subscription-form {
        display: none !important;
    }

    .container {
        max-width: none !important;
        padding: 0 !important;
    }

    section {
        padding: var(--spacing-lg) 0 !important;
    }

    a {
        text-decoration: underline !important;
    }

    .article-card {
        break-inside: avoid;
        margin-bottom: var(--spacing-lg);
    }
}

/* Accessibility Improvements */
@media (prefers-contrast: high) {
    :root {
        --border-light: #000000;
        --border-medium: #000000;
        --text-secondary: #000000;
    }

    .btn {
        border-width: 3px;
    }
}

/* Focus Visible for Better Accessibility */
@media (hover: hover) and (pointer: fine) {
    .nav-link:focus-visible,
    .btn:focus-visible,
    .quiz-option:focus-visible,
    .article-link:focus-visible {
        outline: 2px solid var(--primary-color);
        outline-offset: 2px;
    }
}