/* ===== RESPONSIVE DESIGN - Mobile First Approach ===== */

/* ===== GLOBAL MOBILE OPTIMIZATIONS ===== */
* {
    -webkit-tap-highlight-color: transparent;
}

html {
    overflow-x: hidden;
    width: 100%;
}

body {
    overflow-x: hidden;
    width: 100%;
    position: relative;
}

/* Prevent horizontal scroll */
img, video, iframe {
    max-width: 100%;
    height: auto;
}

/* ===== MOBILE PHONES (320px - 480px) ===== */
@media (max-width: 480px) {
    /* Container & Spacing */
    .container {
        padding: 0 16px;
    }

    .upload-panel-wrapper {
        padding: 0 16px;
    }

    /* Navigation */
    .navbar {
        padding: 12px 0;
    }

    .navbar .container {
        flex-wrap: nowrap;
        gap: 8px;
        justify-content: space-between;
        align-items: center;
    }

    .nav-brand {
        flex: 1 1 auto;
        min-width: 0;
        display: flex;
        align-items: center;
        gap: 6px;
        overflow: visible;
        order: 1;
    }

    .logo {
        font-size: 0.85rem;
        flex-shrink: 1;
        display: flex;
        align-items: center;
        gap: 6px;
    }

    .logo-text {
        display: flex;
        flex-direction: column;
        line-height: 1.1;
    }

    .logo-line-1 {
        font-size: 0.9em;
        white-space: nowrap;
    }

    .logo-line-2 {
        font-size: 0.85em;
        white-space: nowrap;
        display: flex;
        align-items: center;
        gap: 4px;
    }

    .logo i {
        font-size: 1.1rem;
        flex-shrink: 0;
    }

    .logo .version-badge {
        font-size: 0.55rem;
        padding: 2px 4px;
        white-space: nowrap;
        flex-shrink: 0;
        margin-left: 2px;
        display: inline-block;
    }

    .mobile-menu-toggle {
        order: 0;
        margin-right: 4px;
    }

    .nav-actions {
        flex-shrink: 0;
        gap: 6px;
        order: 2;
    }

    .nav-menu {
        position: fixed;
        top: 60px;
        left: -100%;
        width: 100%;
        height: calc(100vh - 60px);
        background: var(--bg-primary);
        flex-direction: column;
        padding: 2rem;
        transition: left 0.3s ease;
        z-index: 999;
        box-shadow: var(--shadow-lg);
        overflow-y: auto;
    }

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

    .nav-menu .nav-link {
        width: 100%;
        padding: 16px;
        justify-content: flex-start;
        border-bottom: 1px solid var(--border-color);
    }

    .mobile-menu-toggle {
        display: flex;
        align-items: center;
        justify-content: center;
        width: 38px;
        height: 38px;
        min-width: 38px;
        max-width: 38px;
        background: var(--bg-tertiary);
        border: none;
        border-radius: var(--radius-md);
        color: var(--text-primary);
        font-size: 1rem;
        cursor: pointer;
        transition: var(--transition);
        z-index: 1001;
        flex-shrink: 0;
        padding: 0;
    }

    .mobile-menu-toggle:hover {
        background: var(--border-color);
    }

    .mobile-menu-toggle.active {
        background: var(--primary);
        color: white;
    }

    .mobile-menu-toggle.active i.fa-bars::before {
        content: "\f00d"; /* Change to X icon when active */
    }

    .nav-actions {
        gap: 8px;
    }

    .nav-actions .btn-outline span {
        display: none; /* Hide text, show only icon */
    }

    .theme-toggle {
        width: 36px;
        height: 36px;
        min-width: 36px;
        flex-shrink: 0;
    }

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

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

    .title-sub {
        font-size: 1.25rem;
        display: block;
        margin-top: 8px;
    }

    .section-description {
        font-size: 0.95rem;
        padding: 0 16px;
    }

    /* Quality Cards */
    .quality-cards {
        grid-template-columns: 1fr;
        gap: 12px;
    }

    .quality-card {
        min-height: 200px;
        height: 200px;
        padding: 16px;
    }

    .flip-card,
    .flip-card-inner,
    .flip-card-front,
    .flip-card-back {
        min-height: 200px;
        height: 200px;
    }

    .quality-icon {
        width: 48px;
        height: 48px;
        font-size: 20px;
    }

    .quality-card h3 {
        font-size: 1rem;
    }

    .quality-card p {
        font-size: 0.85rem;
    }

    /* Upload Panel */
    .upload-panel {
        padding: 24px 16px;
        width: 100%;
        margin: 1rem 0;
        box-sizing: border-box;
    }

    .upload-panel-wrapper {
        width: 100%;
        box-sizing: border-box;
    }

    .upload-zone {
        padding: 30px 20px;
    }

    .upload-icon {
        font-size: 40px;
    }

    .upload-title {
        font-size: 1.25rem;
    }

    .upload-subtitle {
        font-size: 0.85rem;
    }

    .supported-formats {
        gap: 6px;
        margin: 16px 0;
    }

    .format-tag {
        font-size: 10px;
        padding: 4px 8px;
    }

    .btn-upload {
        padding: 10px 20px;
        font-size: 0.9rem;
    }

    /* Upload Stats */
    .upload-stats {
        grid-template-columns: 1fr;
        gap: 16px;
        padding: 20px 0;
    }

    .stat {
        justify-content: center;
        text-align: center;
    }

    .stat-icon {
        width: 40px;
        height: 40px;
        font-size: 18px;
    }

    .stat-value {
        font-size: 1.25rem;
    }

    /* Action Buttons */
    .action-buttons {
        flex-direction: column;
        gap: 10px;
    }

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

    /* File List */
    .file-item {
        flex-wrap: wrap;
        padding: 12px;
        gap: 12px;
    }

    .file-icon {
        width: 36px;
        height: 36px;
        font-size: 18px;
    }

    .file-name {
        font-size: 0.9rem;
    }

    .file-details {
        flex-wrap: wrap;
        gap: 8px;
        font-size: 11px;
    }

    /* Processing Section */
    .processing-card {
        padding: 20px 16px;
    }

    .processing-header {
        flex-direction: column;
        align-items: flex-start;
        gap: 12px;
    }

    .processing-header h2 {
        font-size: 1.25rem;
    }

    /* Results Section */
    .results-card {
        padding: 20px 16px;
    }

    .results-success h2 {
        font-size: 1.5rem;
    }

    .results-stats {
        grid-template-columns: 1fr;
        gap: 16px;
    }

    .result-value {
        font-size: 1.25rem;
        flex-wrap: wrap;
    }

    .results-actions {
        flex-direction: column;
        gap: 10px;
    }

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

    /* Features Section */
    .features-section {
        padding: 40px 0;
        margin: 2rem 0;
    }

    .features-grid {
        grid-template-columns: 1fr;
        gap: 16px;
    }

    .feature-card {
        padding: 20px;
    }

    .feature-header h3 {
        font-size: 1.1rem;
    }

    .feature-card p {
        font-size: 0.9rem;
    }

    /* Formats Section */
    .formats-section {
        padding: 40px 0;
        margin: 2rem 0;
    }

    .formats-grid {
        grid-template-columns: 1fr;
        gap: 16px;
    }

    .format-category {
        padding: 20px;
    }

    .format-list {
        gap: 6px;
    }

    .format-tag {
        font-size: 0.75rem;
        padding: 4px 8px;
    }

    /* Contact Section */
    .contact-section {
        padding: 24px 16px;
    }

    .contact-title {
        font-size: 1.25rem;
    }

    .contact-description {
        font-size: 0.9rem;
    }

    .contact-links {
        flex-direction: column;
        gap: 12px;
    }

    .contact-link {
        width: 100%;
        justify-content: center;
    }

    /* Developers Section */
    .developers-section {
        padding: 40px 0;
        margin: 2rem 0;
    }

    .developers-grid {
        grid-template-columns: 1fr;
        gap: 20px;
    }

    .developer-card {
        padding: 24px;
        min-height: auto;
    }

    .developer-avatar {
        width: 60px;
        height: 60px;
        font-size: 1.5rem;
    }

    .developer-name {
        font-size: 1.25rem;
    }

    .developer-role {
        font-size: 0.9rem;
    }

    .developer-dream {
        font-size: 0.85rem;
    }

    /* Footer */
    .footer {
        padding: 40px 0 20px;
        margin-top: 40px;
    }

    .footer-content {
        gap: 30px;
    }

    .footer-links-container {
        flex-direction: column;
        align-items: flex-start;
        gap: 8px;
    }

    .footer-links-container a {
        width: 100%;
        padding: 8px 12px;
        font-size: 0.95rem;
    }

    /* Animated Header */
    .animated-brand-line {
        font-size: 2rem;
        gap: 8px;
        flex-direction: column;
    }

    .word-cycle,
    .brand-isma,
    .brand-compressor {
        font-size: 2rem;
    }

    /* Prevent text overflow */
    .file-name,
    .file-details {
        word-break: break-word;
        overflow-wrap: break-word;
    }

    /* Output directory text wrapping */
    #outputDirectoryPath {
        word-break: break-all;
        overflow-wrap: break-word;
    }
}

/* ===== VERY SMALL SCREENS (320px - 360px) ===== */
@media (max-width: 360px) {
    .logo {
        font-size: 0.8rem;
    }
    
    .logo-line-1 {
        font-size: 0.85em;
    }
    
    .logo-line-2 {
        font-size: 0.8em;
    }
    
    .logo .version-badge {
        font-size: 0.5rem;
        padding: 2px 3px;
    }
    
    .mobile-menu-toggle {
        width: 36px;
        height: 36px;
        min-width: 36px;
        max-width: 36px;
        font-size: 0.9rem;
    }
    
    .theme-toggle {
        width: 32px;
        height: 32px;
        min-width: 32px;
    }
}

/* ===== TABLETS (481px - 768px) ===== */
@media (min-width: 481px) and (max-width: 768px) {
    .mobile-menu-toggle {
        display: none;
    }

    .nav-menu {
        position: static;
        left: auto;
        width: auto;
        height: auto;
        background: transparent;
        flex-direction: row;
        padding: 0;
        box-shadow: none;
        overflow-y: visible;
    }

    .nav-menu .nav-link {
        width: auto;
        padding: 8px 12px;
        border-bottom: none;
    }

    /* Keep logo horizontal on tablets */
    .logo-text {
        flex-direction: row;
    }

    .logo-line-1,
    .logo-line-2 {
        display: inline;
    }
    /* Container */
    .container {
        padding: 0 24px;
    }

    .upload-panel-wrapper {
        padding: 0 24px;
    }

    /* Navigation */
    .nav-menu {
        gap: 1rem;
    }

    .nav-link span {
        display: none; /* Hide text, show only icons on tablets */
    }

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

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

    /* Quality Cards */
    .quality-cards {
        grid-template-columns: repeat(2, 1fr);
        gap: 14px;
    }

    .quality-card {
        min-height: 220px;
        height: 220px;
        padding: 20px;
    }

    .flip-card,
    .flip-card-inner,
    .flip-card-front,
    .flip-card-back {
        min-height: 220px;
        height: 220px;
    }

    /* Upload Panel */
    .upload-panel {
        padding: 32px 24px;
    }

    .upload-zone {
        padding: 40px 30px;
    }

    /* Upload Stats */
    .upload-stats {
        grid-template-columns: repeat(3, 1fr);
        gap: 16px;
    }

    /* Features & Formats Grid */
    .features-grid,
    .formats-grid {
        grid-template-columns: repeat(2, 1fr);
        gap: 20px;
    }

    /* Developers Grid */
    .developers-grid {
        grid-template-columns: repeat(2, 1fr);
        gap: 20px;
    }

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

    /* Animated Header */
    .animated-brand-line {
        font-size: 2.75rem;
        gap: 12px;
    }

    .word-cycle,
    .brand-isma,
    .brand-compressor {
        font-size: 2.75rem;
    }
}

/* ===== SMALL LAPTOPS (769px - 1024px) ===== */
@media (min-width: 769px) and (max-width: 1024px) {
    /* Keep logo horizontal on laptops */
    .logo-text {
        flex-direction: row;
    }

    .logo-line-1,
    .logo-line-2 {
        display: inline;
    }
    /* Container */
    .container {
        max-width: 960px;
        padding: 0 32px;
    }

    .upload-panel-wrapper {
        padding: 0 32px;
    }

    /* Quality Cards */
    .quality-cards {
        grid-template-columns: repeat(4, 1fr);
        gap: 14px;
    }

    /* Features & Formats Grid */
    .features-grid,
    .formats-grid {
        grid-template-columns: repeat(2, 1fr);
        gap: 24px;
    }

    /* Developers Grid */
    .developers-grid {
        grid-template-columns: repeat(3, 1fr);
    }
}

/* ===== LARGE SCREENS (1025px+) ===== */
@media (min-width: 1025px) {
    /* Everything should work well on large screens */
    /* Additional optimizations can be added here if needed */
}

/* ===== LANDSCAPE ORIENTATION (Mobile & Tablet) ===== */
@media (max-width: 768px) and (orientation: landscape) {
    .quality-cards {
        grid-template-columns: repeat(4, 1fr);
    }

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

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

/* ===== TOUCH DEVICE OPTIMIZATIONS ===== */
@media (hover: none) and (pointer: coarse) {
    /* Increase touch target sizes */
    .btn {
        min-height: 44px;
        min-width: 44px;
    }

    .nav-link {
        min-height: 44px;
        padding: 12px 16px;
    }

    .quality-card {
        cursor: pointer;
    }

    /* Remove hover effects on touch devices */
    .quality-card:hover:not(.active) {
        transform: none;
    }

    .feature-card:hover {
        transform: none;
    }

    .developer-card:hover {
        transform: none;
    }
}

/* ===== HIGH DPI DISPLAYS ===== */
@media (-webkit-min-device-pixel-ratio: 2), (min-resolution: 192dpi) {
    /* Optimize for retina displays */
    .logo i,
    .quality-icon,
    .stat-icon {
        -webkit-font-smoothing: antialiased;
        -moz-osx-font-smoothing: grayscale;
    }
}

/* ===== PRINT STYLES ===== */
@media print {
    .navbar,
    .action-buttons,
    .processing-actions,
    .results-actions {
        display: none;
    }

    .upload-panel,
    .results-card,
    .processing-card {
        box-shadow: none;
        border: 1px solid #ccc;
    }
}