:root {
    /* Color Palette - Premium & Modern */
    --primary: #3b82f6;
    --primary-light: #eff6ff;
    --primary-dark: #1d4ed8;
    --primary-gradient: linear-gradient(135deg, #3b82f6 0%, #1d4ed8 100%);
    --success: #10b981;
    --success-light: #ecfdf5;
    --success-gradient: linear-gradient(135deg, #10b981 0%, #059669 100%);
    --error: #ef4444;
    --warning: #f59e0b;

    /* Light Mode Tokens */
    --bg-app: #f8fafc;
    --bg-card: #ffffff;
    --bg-alt: #f1f5f9;
    --bg-input: #ffffff;
    --text-main: #1e293b;
    --text-light: #64748b;
    --border: #e2e8f0;
    --shadow: 0 4px 6px -1px rgba(0, 0, 0, 0.1), 0 2px 4px -1px rgba(0, 0, 0, 0.06);
    --shadow-premium: 0 10px 30px -5px rgba(59, 130, 246, 0.3);
    --glass: rgba(255, 255, 255, 0.85);

    --radius: 12px;
    --radius-lg: 20px;
    --font-main: 'Plus Jakarta Sans', -apple-system, blinkmacsystemfont, 'Segoe UI', roboto, sans-serif;
    --transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
}

[data-theme="dark"] {
    --bg-app: #0f172a;
    --bg-card: #1e293b;
    --bg-alt: #334155;
    --bg-input: #0f172a;
    --text-main: #f8fafc;
    --text-light: #94a3b8;
    --border: #334155;
    --shadow: 0 10px 15px -3px rgba(0, 0, 0, 0.5);
    --shadow-premium: 0 15px 40px -10px rgba(0, 0, 0, 0.6);
    --glass: rgba(15, 23, 42, 0.85);
}

@font-face {
    font-family: 'Plus Jakarta Sans';
    src: url('https://fonts.googleapis.com/css2?family=Plus+Jakarta+Sans:wght@400;500;600;700;800&display=swap');
}

* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

body {
    background-color: var(--bg-app);
    color: var(--text-main);
    font-family: var(--font-main);
    transition: background-color 0.3s, color 0.3s;
    line-height: 1.5;
    -webkit-font-smoothing: antialiased;
    min-height: 100vh;
}

.container {
    max-width: 1100px;
    margin: 0 auto;
    padding: 40px 20px 140px;
}

header {
    margin-bottom: 60px;
    text-align: center;
}

.header-top {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 12px;
}

.logo {
    display: flex;
    align-items: center;
    gap: 12px;
}

.logo h1 {
    font-size: 1.75rem;
    font-weight: 800;
    color: var(--text-main);
    letter-spacing: -0.03em;
    text-align: left;
    line-height: 1.2;
}

.logo-img-wrapper {
    width: 44px;
    height: 44px;
    display: flex;
    align-items: center;
    justify-content: center;
}

.brand-logo {
    width: 100%;
    height: 100%;
    object-fit: contain;
    border-radius: 8px;
}

header p {
    color: var(--text-light);
    font-size: 1.1rem;
    font-weight: 500;
}

/* Theme Toggle */
.theme-btn {
    background: var(--bg-card);
    border: 1px solid var(--border);
    padding: 10px;
    border-radius: 12px;
    cursor: pointer;
    display: flex;
    align-items: center;
    justify-content: center;
    transition: var(--transition);
    box-shadow: var(--shadow);
    color: var(--text-main);
}

.theme-btn:hover {
    transform: translateY(-2px);
    border-color: var(--primary);
    box-shadow: var(--shadow-premium);
}

.sun-icon {
    display: none;
}

.moon-icon {
    display: block;
}

[data-theme="dark"] .sun-icon {
    display: block;
}

[data-theme="dark"] .moon-icon {
    display: none;
}

/* Premium Button Engine */
.primary-btn {
    background: var(--primary-gradient);
    color: white !important;
    border: none;
    padding: 14px 28px;
    border-radius: 12px;
    font-weight: 700;
    font-size: 1rem;
    cursor: pointer;
    transition: var(--transition);
    box-shadow: 0 4px 15px rgba(59, 130, 246, 0.3);
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: 10px;
    white-space: nowrap;
}

.primary-btn:hover {
    transform: translateY(-3px) scale(1.02);
    box-shadow: 0 8px 25px rgba(59, 130, 246, 0.4);
    filter: brightness(1.1);
}

.primary-btn:active {
    transform: translateY(-1px) scale(0.98);
}

.glow-btn {
    position: relative;
    overflow: hidden;
}

.glow-btn::after {
    content: '';
    position: absolute;
    top: -50%;
    left: -50%;
    width: 200%;
    height: 200%;
    background: radial-gradient(circle, rgba(255, 255, 255, 0.2) 0%, transparent 70%);
    opacity: 0;
    transition: opacity 0.3s;
    pointer-events: none;
}

.glow-btn:hover::after {
    opacity: 1;
}

.secondary-btn {
    background: var(--bg-card);
    color: var(--text-main);
    border: 1px solid var(--border);
    padding: 12px 24px;
    border-radius: 12px;
    font-weight: 700;
    font-size: 0.95rem;
    cursor: pointer;
    transition: var(--transition);
}

.secondary-btn:hover {
    background: var(--bg-alt);
    border-color: var(--primary);
    transform: translateY(-2px);
}

.success-btn {
    background: var(--success-gradient);
    box-shadow: 0 4px 15px rgba(16, 185, 129, 0.3);
}

/* Global Input/Select Polish */
input[type="number"],
input[type="text"],
select {
    width: 100%;
    padding: 12px 16px;
    border: 1px solid var(--border);
    border-radius: 12px;
    font-family: inherit;
    font-size: 0.95rem;
    background: var(--bg-input);
    color: var(--text-main);
    outline: none;
    transition: var(--transition);
}

input[type="number"]:focus,
input[type="text"]:focus,
select:focus {
    border-color: var(--primary);
    box-shadow: 0 0 0 4px rgba(59, 130, 246, 0.1);
}

/* Custom Select Engine Styles */
.custom-select-container {
    position: relative;
    width: 100%;
    user-select: none;
}

.custom-select-trigger {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 12px 16px;
    background: var(--bg-input);
    border: 1px solid var(--border);
    border-radius: 12px;
    cursor: pointer;
    font-size: 0.95rem;
    color: var(--text-main);
    transition: var(--transition);
}

.custom-select-trigger:after {
    content: '';
    width: 10px;
    height: 10px;
    border-right: 2px solid var(--text-light);
    border-bottom: 2px solid var(--text-light);
    transform: rotate(45deg);
    margin-top: -4px;
    transition: transform 0.3s;
}

.custom-select-container.open .custom-select-trigger {
    border-color: var(--primary);
    box-shadow: 0 0 0 4px rgba(59, 130, 246, 0.1);
}

.custom-select-container.open .custom-select-trigger:after {
    transform: rotate(-135deg);
    margin-top: 4px;
}

.custom-select-options {
    position: absolute;
    top: calc(100% + 8px);
    left: 0;
    right: 0;
    background: var(--glass);
    backdrop-filter: blur(12px);
    -webkit-backdrop-filter: blur(12px);
    border: 1px solid var(--border);
    border-radius: 16px;
    box-shadow: var(--shadow-premium);
    z-index: 2100;
    opacity: 0;
    visibility: hidden;
    transform: translateY(-10px);
    transition: var(--transition);
    overflow: hidden;
    max-height: 250px;
    overflow-y: auto;
}

.custom-select-container.open .custom-select-options {
    opacity: 1;
    visibility: visible;
    transform: translateY(0);
}

.custom-select-container.open-up .custom-select-options {
    top: auto;
    bottom: calc(100% + 8px);
    transform: translateY(10px);
}

.custom-select-container.open-up.open .custom-select-options {
    transform: translateY(0);
}

.custom-select-option {
    padding: 12px 16px;
    cursor: pointer;
    font-size: 0.95rem;
    color: var(--text-main);
    transition: background 0.2s;
}

.custom-select-option:hover {
    background: var(--bg-alt);
    color: var(--primary);
}

.custom-select-option.selected {
    background: var(--primary-light);
    color: var(--primary);
    font-weight: 700;
}

[data-theme="dark"] .custom-select-option.selected {
    background: rgba(59, 130, 246, 0.1);
}

/* Hide native select but keep accessible */
.native-hide {
    position: absolute;
    opacity: 0;
    pointer-events: none;
    z-index: -1;
}

/* Stage Transitions */
section {
    display: none;
    animation: fadeIn 0.5s cubic-bezier(0.16, 1, 0.3, 1);
}

section.stage-active {
    display: block;
}

.stage-header {
    margin: 12px 0;
    display: flex;
    justify-content: space-between;
    align-items: center;
    flex-wrap: wrap;
    gap: 12px;
}

/* Sync Resize Toggle */
.sync-toggle-wrapper {
    display: flex;
    align-items: center;
}

.sync-toggle {
    display: flex;
    align-items: center;
    gap: 12px;
    cursor: pointer;
    user-select: none;
}

.sync-toggle span {
    font-size: 0.85rem;
    font-weight: 700;
    color: var(--text-light);
    transition: color 0.3s;
}

.sync-toggle:has(input:checked) span {
    color: var(--primary);
}

.toggle-track {
    position: relative;
    width: 48px;
    height: 26px;
    background: var(--border);
    border-radius: 100px;
    transition: background 0.3s;
    cursor: pointer;
}

.toggle-track input {
    opacity: 0;
    width: 0;
    height: 0;
    position: absolute;
}

.toggle-thumb {
    position: absolute;
    top: 3px;
    left: 3px;
    width: 20px;
    height: 20px;
    background: white;
    border-radius: 50%;
    transition: transform 0.3s cubic-bezier(0.4, 0, 0.2, 1), box-shadow 0.3s;
    box-shadow: 0 1px 3px rgba(0, 0, 0, 0.2);
}

.toggle-track input:checked + .toggle-thumb {
    transform: translateX(22px);
    box-shadow: 0 2px 6px rgba(59, 130, 246, 0.4);
}

.toggle-track:has(input:checked) {
    background: var(--primary);
}

@keyframes fadeIn {
    from {
        opacity: 0;
        transform: translateY(20px);
    }

    to {
        opacity: 1;
        transform: translateY(0);
    }
}

/* Upload Card */
.upload-card {
    background: var(--bg-card);
    border: 3px dashed var(--border);
    border-radius: 24px;
    padding: 40px 40px;
    text-align: center;
    transition: var(--transition);
    cursor: pointer;
    box-shadow: var(--shadow);
}

.upload-card:hover {
    border-color: var(--primary);
    box-shadow: var(--shadow-premium);
    transform: translateY(-4px);
}

.upload-card.drag-over {
    border-color: var(--primary);
    background: var(--primary-light);
}

[data-theme="dark"] .upload-card.drag-over {
    background: rgba(59, 130, 246, 0.1);
}

.upload-icon {
    font-size: 4rem;
    margin-bottom: 32px;
    display: block;
}

.upload-card h2 {
    font-size: 2rem;
    font-weight: 800;
    margin-bottom: 12px;
}

/* Configuration Cards */
.config-grid {
    display: flex;
    flex-direction: column;
    gap: 24px;
}

.file-config-card {
    background: var(--bg-card);
    border: 1px solid var(--border);
    border-radius: 20px;
    padding: 24px;
    display: flex;
    gap: 28px;
    box-shadow: var(--shadow);
    position: relative;
    transition: var(--transition);
}

.file-config-card:hover {
    border-color: var(--primary);
}

.remove-file-btn {
    position: absolute;
    top: -15px;
    right: -10px;
    background: red;
    color: #fff;
    border: none;
    width: 40px;
    height: 40px;
    border-radius: 100px;
    cursor: pointer;
    font-size: 1.25rem;
    display: flex;
    align-items: center;
    justify-content: center;
    transition: var(--transition);
    z-index: 10;
}

.remove-file-btn:hover {
    background: red;
    color: white;
    transform: rotate(90deg);
}

.preview-img-container {
    width: 200px;
    height: 200px;
    background: var(--bg-alt);
    border-radius: 16px;
    padding: 10px;
    display: flex;
    align-items: center;
    justify-content: center;
    border: 1px solid var(--border);
}

.preview-img-container img {
    max-width: 100%;
    max-height: 100%;
    border-radius: 8px;
}

.file-settings-area {
    flex: 1;
    display: flex;
    flex-direction: column;
    justify-content: center;
}

.settings-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 16px;
    gap: 20px;
}

.file-name {
    font-weight: 700;
    font-size: 1.1rem;
    white-space: nowrap;
    overflow: hidden;
    text-overflow: ellipsis;
    color: var(--text-main);
    flex: 1;
}

.settings-tabs {
    display: flex;
    gap: 20px;
    border-bottom: 1px solid var(--border);
}

.settings-tab {
    padding: 8px 0;
    font-weight: 700;
    font-size: 0.9rem;
    color: var(--text-light);
    cursor: pointer;
    border-bottom: 2px solid transparent;
    transition: var(--transition);
}

.settings-tab.active {
    color: var(--primary);
    border-color: var(--primary);
}

.tab-content {
    display: none;
}

.tab-content.active {
    display: block;
}

.resize-v2-container {
    background: var(--bg-alt);
    padding: 16px;
    border-radius: 16px;
    border: 1px solid var(--border);
}

.compact-row {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 12px;
}

.resize-mode-radios {
    background: var(--bg-card);
    display: inline-flex;
    padding: 4px;
    border-radius: 10px;
    border: 1px solid var(--border);
}

.radio-item {
    padding: 6px 14px;
    font-size: 0.8rem;
    font-weight: 600;
    border-radius: 6px;
    cursor: pointer;
}

.radio-item input {
    display: none;
    appearance: none;
    -webkit-appearance: none;
}

.radio-item:has(input:checked) {
    background: var(--primary);
    color: white;
}

.compact-stats {
    font-size: 0.75rem;
    font-weight: 700;
    color: var(--text-light);
}

.horizontal-controls {
    display: flex;
    gap: 20px;
    align-items: flex-end;
}

.dim-row-v2 {
    display: flex;
    align-items: flex-end;
    gap: 8px;
}

.mini-group {
    display: flex;
    flex-direction: column;
    gap: 4px;
}

.mini-group label {
    font-size: 0.65rem;
    font-weight: 800;
    text-transform: uppercase;
    color: var(--text-light);
}

.mini-group input,
.mini-group select {
    padding: 6px 10px;
    font-size: 0.85rem;
    height: 36px;
}

.link-icon {
    font-size: 0.8rem;
    margin-bottom: 8px;
    color: var(--text-light);
}

.quality-format-row {
    display: flex;
    gap: 12px;
    flex: 1;
}

.quality-col {
    flex: 1.5;
}

.format-col {
    flex: 1;
}

.compact-footer-stats {
    display: flex;
    gap: 8px;
    margin-top: 12px;
    border-top: 1px solid var(--border);
    padding-top: 12px;
}

.stats-pill {
    font-size: 0.7rem;
    color: var(--text-light);
    background: var(--bg-card);
    padding: 3px 8px;
    border-radius: 12px;
    border: 1px solid var(--border);
}

.stats-pill strong {
    color: var(--primary);
}

/* Crop Panel */
.crop-mini-panel {
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: 20px;
    background: var(--bg-alt);
    border-radius: 16px;
    border: 1px solid var(--border);
}

.crop-info h3 {
    font-size: 0.9rem;
    font-weight: 800;
}

.crop-info p {
    font-size: 0.75rem;
    color: var(--text-light);
}

/* Sticky Bar */
.batch-footer {
    position: fixed;
    bottom: 0;
    left: 0;
    width: 100%;
    background: var(--glass);
    backdrop-filter: blur(20px);
    -webkit-backdrop-filter: blur(20px);
    border-top: 1px solid var(--border);
    padding: 16px 0;
    z-index: 1000;
}

.footer-container {
    max-width: 1100px;
    margin: 0 auto;
    padding: 0 40px;
    display: flex;
    align-items: center;
    justify-content: space-between;
}

.footer-container .control-item {
    max-width: 350px;
    width: 100%;
}

.footer-container .control-item label {
    font-size: 0.75rem;
    font-weight: 800;
    letter-spacing: 0.05em;
    color: var(--text-light);
    white-space: nowrap;
    text-transform: uppercase;
}

.footer-container .control-item select {
    width: auto;
    min-width: 240px;
    height: 48px;
    padding: 0 16px;
    cursor: pointer;
    background-image: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='16' height='16' viewBox='0 0 24 24' fill='none' stroke='%2364748b' stroke-width='2' stroke-linecap='round' stroke-linejoin='round'%3E%3Cpath d='m6 9 6 6 6-6'/%3E%3C/svg%3E");
    background-repeat: no-repeat;
    background-position: right 12px center;
    padding-right: 40px;
    appearance: none;
    -webkit-appearance: none;
}

.footer-container .control-item input[type="range"] {
    width: 200px;
    height: 6px;
    background: var(--border);
    border-radius: 10px;
    outline: none;
    accent-color: var(--primary);
    cursor: pointer;
}

.footer-container .control-item select option {
    background: var(--bg-card);
    color: var(--text-main);
    padding: 12px;
}

.control-item {
    display: flex;
    align-items: center;
    gap: 16px;
}

.progress-container {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 4px;
    background: rgba(0, 0, 0, 0.05);
    z-index: 1001;
}

.progress-fill {
    height: 100%;
    background: var(--success-gradient);
    width: 0%;
    transition: width 0.3s ease;
}

/* Modal System */
.modal-overlay {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: rgba(15, 23, 42, 0.8);
    backdrop-filter: blur(8px);
    z-index: 2000;
    display: flex;
    align-items: center;
    justify-content: center;
    animation: fadeIn 0.3s ease-out;
}

.modal {
    background: var(--bg-card);
    width: 90%;
    max-width: 800px;
    border-radius: 24px;
    padding: 32px;
    box-shadow: 0 20px 50px rgba(0, 0, 0, 0.3);
}

.modal-header {
    margin-bottom: 24px;
}

.modal-header h3 {
    font-size: 1.5rem;
    font-weight: 800;
}

.modal-header p {
    color: var(--text-light);
}

#crop-workspace {
    background: var(--bg-alt);
    border-radius: 16px;
    margin-bottom: 24px;
    max-height: 50vh;
    overflow: hidden;
    display: flex;
    justify-content: center;
}

.ratio-bar {
    display: flex;
    gap: 12px;
    margin-bottom: 32px;
    flex-wrap: wrap;
    justify-content: center;
}

.ratio-btn {
    background: var(--bg-alt);
    border: 1px solid var(--border);
    padding: 8px 16px;
    border-radius: 10px;
    font-weight: 700;
    cursor: pointer;
    transition: var(--transition);
}

.ratio-btn:hover,
.ratio-btn.active {
    background: var(--primary);
    color: white;
    border-color: var(--primary);
}

.modal-footer {
    display: flex;
    justify-content: flex-end;
    gap: 16px;
}

/* Results Stage (Step 3) - Premium Restyle */
.results-header-actions {
    display: flex;
    gap: 12px;
    margin: 15px 0;
}

.results-list {
    display: flex;
    flex-direction: column;
    gap: 16px;
    margin-bottom: 32px;
}

.result-card {
    background: var(--bg-card);
    border: 1px solid var(--border);
    border-radius: 16px;
    padding: 20px 24px;
    display: flex;
    align-items: center;
    justify-content: space-between;
    transition: var(--transition);
    box-shadow: var(--shadow);
}

.result-card:hover {
    transform: translateY(-2px);
    border-color: var(--primary);
    box-shadow: var(--shadow-premium);
}

.result-info {
    display: flex;
    align-items: center;
    gap: 20px;
    flex: 1;
}

.result-icon {
    width: 54px;
    height: 54px;
    background: var(--bg-alt);
    border-radius: 12px;
    display: flex;
    align-items: center;
    justify-content: center;
    font-weight: 800;
    font-size: 0.8rem;
    color: var(--primary);
    border: 1px solid var(--border);
}

.result-meta {
    flex: 1;
}

.result-filename {
    font-weight: 700;
    font-size: 1rem;
    color: var(--text-main);
    margin-bottom: 4px;
    white-space: nowrap;
    overflow: hidden;
    text-overflow: ellipsis;
    max-width: 400px;
}

.result-stats-row {
    display: flex;
    align-items: center;
    gap: 12px;
    font-size: 0.85rem;
    color: var(--text-light);
}

.stat-item strong {
    color: var(--text-main);
}

.stat-divider {
    color: var(--border);
    font-weight: 700;
}

.success-text {
    color: var(--success) !important;
}

.result-actions {
    display: flex;
    align-items: center;
    gap: 24px;
}

.savings-badge {
    background: var(--success-light);
    color: var(--success);
    padding: 6px 14px;
    border-radius: 100px;
    font-weight: 800;
    font-size: 0.85rem;
}

[data-theme="dark"] .savings-badge {
    background: rgba(16, 185, 129, 0.1);
}

.mini-btn {
    padding: 10px 20px;
    font-size: 0.9rem;
    border-radius: 10px;
    text-decoration: none;
}

.results-footer {
    background: var(--bg-alt);
    padding: 32px;
    border-radius: 20px;
    display: flex;
    justify-content: space-between;
    align-items: center;
    border: 1px solid var(--border);
}

#batch-summary {
    font-size: 1rem;
    color: var(--text-light);
}

#batch-summary strong {
    color: var(--primary);
    font-weight: 800;
}

.error-text {
    color: var(--error);
    font-size: 0.85rem;
    font-weight: 600;
}

.result-card.error {
    border-left: 4px solid var(--error);
}

/* Red-themed Start Again Button */
#start-again-btn:hover {
    border-color: var(--error);
    color: var(--error);
}

/* Scrollbar */
::-webkit-scrollbar {
    width: 8px;
}

::-webkit-scrollbar-track {
    background: var(--bg-app);
}

::-webkit-scrollbar-thumb {
    background: var(--border);
    border-radius: 4px;
}

.result-preview {
    width: 64px;
    height: 64px;
    border-radius: 12px;
    background: var(--bg-input);
    display: flex;
    align-items: center;
    justify-content: center;
    overflow: hidden;
    flex-shrink: 0;
    border: 1px solid var(--border);
}

.result-preview img {
    width: 100%;
    height: 100%;
    object-fit: cover;
}

::-webkit-scrollbar-thumb:hover {
    background: var(--text-light);
}

/* ==========================================================================
   Mobile Responsiveness (Responsive Engine)
   ========================================================================== */

@media (max-width: 900px) {
    .container {
        padding: 20px 16px 160px;
    }

    .footer-container {
        padding: 0 20px;
    }
}

@media (max-width: 768px) {
    header {
        margin-bottom: 40px;
    }

    .logo {
        gap: 10px;
    }

    .logo h1 {
        font-size: 1.4rem;
    }

    .logo-img-wrapper {
        width: 38px;
        height: 38px;
    }

    header p {
        font-size: 0.95rem;
    }

    /* Step 2: Configuration Cards Stacking */
    .file-config-card {
        flex-direction: column;
        padding: 20px;
        gap: 20px;
    }

    .preview-img-container {
        width: 100%;
        height: 180px;
    }

    .settings-header {
        flex-direction: column;
        align-items: flex-start;
        gap: 10px;
    }

    .horizontal-controls {
        flex-direction: column;
        align-items: stretch;
        gap: 16px;
    }

    .quality-format-row {
        width: 100%;
    }

    .settings-tabs {
        justify-content: space-around;
        gap: 10px;
    }

    .settings-tab {
        flex: 1;
        text-align: center;
        font-size: 0.85rem;
    }

    .remove-file-btn {
        top: -10px;
        right: -10px;
        width: 36px;
        height: 36px;
    }

    .crop-mini-panel {
        flex-direction: column;
        gap: 16px;
        text-align: center;
        padding: 24px 16px;
    }

    .crop-status-indicator {
        font-size: 0.85rem;
        font-weight: 700;
        color: var(--primary);
    }

    .crop-mini-panel button {
        width: 100%;
    }

    /* Batch Footer (Sticky Bar) */
    .footer-container {
        flex-direction: column;
        gap: 16px;
        align-items: stretch;
    }

    .footer-container .control-item {
        max-width: none;
        justify-content: space-between;
    }

    .footer-container .control-item select {
        flex: 1;
        min-width: 0;
    }

    .footer-container .control-item input[type="range"] {
        flex: 1;
    }

    #optimize-btn {
        width: 100%;
        height: 54px;
    }

    /* Step 3: Result Cards */
    .result-card {
        flex-direction: column;
        align-items: stretch;
        gap: 16px;
    }

    .result-info {
        width: 100%;
    }

    .result-actions {
        justify-content: space-between;
        width: 100%;
        gap: 12px;
    }

    .results-footer {
        flex-direction: column;
        gap: 20px;
        text-align: center;
    }

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

    .results-header-actions .primary-btn,
    .results-header-actions .secondary-btn {
        flex: 1;
    }
}

@media (max-width: 480px) {
    .logo h1 {
        font-size: 1.2rem;
    }

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

    .upload-icon {
        font-size: 3rem;
        margin-bottom: 20px;
    }

    .upload-card h2 {
        font-size: 1.5rem;
    }

    .dim-row-v2 {
        flex-wrap: wrap;
    }

    .mini-group {
        flex: 1;
        min-width: 80px;
    }

    .result-filename {
        max-width: 200px;
    }

    .modal {
        padding: 24px 16px;
        width: 95%;
    }

    .modal-footer {
        flex-direction: column;
    }

    .modal-footer button {
        width: 100%;
    }
}

/* ==========================================================================
   PWA Install Prompt
   ========================================================================== */

.pwa-prompt {
    position: fixed;
    inset: 0;
    z-index: 99999;
    display: flex;
    align-items: flex-end;
    justify-content: center;
    padding: 0 1rem calc(1rem + env(safe-area-inset-bottom, 0px));
    pointer-events: none;
}

.pwa-prompt.pwa-ios {
    align-items: flex-end;
}

.pwa-backdrop {
    position: absolute;
    inset: 0;
    background: rgba(0, 0, 0, 0);
    backdrop-filter: blur(0px);
    transition: background 0.35s ease, backdrop-filter 0.35s ease;
    pointer-events: none;
}

.pwa-prompt.pwa-visible {
    pointer-events: all;
}

.pwa-prompt.pwa-visible .pwa-backdrop {
    background: rgba(0, 0, 0, 0.45);
    backdrop-filter: blur(4px);
    pointer-events: all;
}

.pwa-card {
    position: relative;
    background: var(--bg-card);
    border: 1px solid var(--border);
    border-radius: 22px;
    padding: 1.25rem 1.25rem 1.25rem 1.1rem;
    max-width: 420px;
    width: 100%;
    display: flex;
    gap: 1rem;
    align-items: flex-start;
    box-shadow: 0 8px 40px rgba(0, 0, 0, 0.18), 0 2px 8px rgba(0, 0, 0, 0.08);
    transform: translateY(24px);
    opacity: 0;
    transition:
        transform 0.42s cubic-bezier(0.34, 1.56, 0.64, 1),
        opacity 0.28s ease;
    margin-bottom: 0.5rem;
}

.pwa-prompt.pwa-visible .pwa-card {
    transform: translateY(0);
    opacity: 1;
}

.pwa-app-icon {
    flex-shrink: 0;
    width: 54px;
    height: 54px;
    border-radius: 13px;
    overflow: hidden;
    border: 1px solid var(--border);
    box-shadow: var(--shadow);
}

.pwa-app-icon img {
    width: 100%;
    height: 100%;
    object-fit: cover;
}

.pwa-body {
    flex: 1;
    min-width: 0;
}

.pwa-title {
    font-size: 0.95rem;
    font-weight: 700;
    color: var(--text-main);
    margin: 0 0 0.3rem;
    line-height: 1.3;
}

.pwa-desc {
    font-size: 0.8rem;
    color: var(--text-light);
    margin: 0 0 0.9rem;
    line-height: 1.55;
}

.pwa-share-icon {
    display: inline-block;
    vertical-align: middle;
    margin: 0 2px;
    color: #3b82f6;
}

.pwa-actions {
    display: flex;
    gap: 0.5rem;
    align-items: center;
}

.pwa-btn {
    border: none;
    border-radius: 10px;
    font-family: var(--font-main);
    font-size: 0.82rem;
    font-weight: 600;
    cursor: pointer;
    padding: 0.5rem 1rem;
    transition: all 0.2s ease;
    white-space: nowrap;
    line-height: 1;
}

.pwa-btn-yes {
    background: var(--primary-gradient);
    color: white;
    display: flex;
    align-items: center;
    gap: 0.35rem;
    box-shadow: 0 4px 14px rgba(59, 130, 246, 0.35);
}

.pwa-btn-yes:hover {
    transform: translateY(-1px);
    box-shadow: 0 6px 18px rgba(59, 130, 246, 0.45);
}

.pwa-btn-yes:active {
    transform: translateY(0);
}

.pwa-btn-no {
    background: var(--bg-alt);
    color: var(--text-light);
}

.pwa-btn-no:hover {
    background: var(--border);
    color: var(--text-main);
}

/* iOS prompt arrow pointing down toward share bar */
.pwa-ios-card {
    border-radius: 22px;
    margin-bottom: 1.5rem;
}

.pwa-ios-arrow {
    position: absolute;
    bottom: -10px;
    left: 50%;
    transform: translateX(-50%);
    width: 0;
    height: 0;
    border-left: 10px solid transparent;
    border-right: 10px solid transparent;
    border-top: 10px solid var(--bg-card);
    filter: drop-shadow(0 2px 2px rgba(0,0,0,0.08));
}

[data-theme="dark"] .pwa-ios-arrow {
    border-top-color: var(--bg-card);
}