/* ===== Design Tokens ===== */
:root {
    --color-bg: #0f0f13;
    --color-surface: #1a1a24;
    --color-surface-2: #24243a;
    --color-border: #2e2e48;
    --color-text: #e8e8f0;
    --color-text-secondary: #9090b0;
    --color-accent: #7c5cff;
    --color-accent-hover: #9478ff;
    --color-ig: #e1306c;
    --color-ig-hover: #f0528a;
    --color-fb: #1877f2;
    --color-fb-hover: #3b8ff6;
    --color-web: #f59e0b;
    --color-web-hover: #fbbf24;
    --color-green: #34d399;
    --radius: 12px;
    --radius-sm: 8px;
    --shadow: 0 4px 24px rgba(0, 0, 0, 0.4);
    --font: 'Inter', -apple-system, BlinkMacSystemFont, sans-serif;
    --transition: 0.2s ease;
}

/* ===== Reset & Base ===== */
*,
*::before,
*::after {
    box-sizing: border-box;
    margin: 0;
    padding: 0;
}

body {
    font-family: var(--font);
    background: var(--color-bg);
    color: var(--color-text);
    min-height: 100vh;
    line-height: 1.6;
    -webkit-font-smoothing: antialiased;
}

/* ===== Password Overlay ===== */
.password-overlay {
    position: fixed;
    inset: 0;
    background: rgba(15, 15, 19, 0.95);
    display: flex;
    align-items: center;
    justify-content: center;
    z-index: 1000;
}

.password-box {
    background: var(--color-surface);
    border: 1px solid var(--color-border);
    border-radius: var(--radius);
    padding: 40px 36px;
    text-align: center;
    width: 100%;
    max-width: 360px;
    box-shadow: 0 8px 40px rgba(0, 0, 0, 0.5);
}

.password-box__icon {
    font-size: 2.5rem;
    margin-bottom: 12px;
}

.password-box__title {
    font-size: 1.2rem;
    font-weight: 600;
    margin-bottom: 20px;
}

.password-box__input {
    width: 100%;
    padding: 12px 16px;
    border: 1px solid var(--color-border);
    border-radius: var(--radius-sm);
    background: var(--color-surface-2);
    color: var(--color-text);
    font-family: var(--font);
    font-size: 1rem;
    outline: none;
    margin-bottom: 12px;
    transition: border-color var(--transition);
}

.password-box__input:focus {
    border-color: var(--color-accent);
}

.password-box__error {
    color: #f87171;
    font-size: 0.85rem;
    margin-bottom: 12px;
}

.password-box__btn {
    width: 100%;
}

/* ===== App Layout ===== */
.app {
    max-width: 960px;
    margin: 0 auto;
    padding: 24px 20px 48px;
}

/* ===== Header ===== */
.header {
    text-align: center;
    margin-bottom: 32px;
}

.header__title {
    font-size: 2rem;
    font-weight: 700;
    background: linear-gradient(135deg, var(--color-accent), var(--color-ig), var(--color-fb));
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

.header__subtitle {
    color: var(--color-text-secondary);
    font-size: 0.95rem;
    margin-top: 4px;
}

/* ===== Upload Dropzone ===== */
.upload-section {
    margin-bottom: 32px;
}

.upload-dropzone {
    border: 2px dashed var(--color-border);
    border-radius: var(--radius);
    background: var(--color-surface);
    padding: 56px 24px;
    text-align: center;
    cursor: pointer;
    transition: border-color var(--transition), background var(--transition);
}

.upload-dropzone:hover,
.upload-dropzone.drag-over {
    border-color: var(--color-accent);
    background: var(--color-surface-2);
}

.upload-dropzone__icon {
    font-size: 3rem;
    margin-bottom: 12px;
}

.upload-dropzone__text {
    font-size: 1.05rem;
    font-weight: 500;
    margin-bottom: 6px;
}

.upload-dropzone__hint {
    color: var(--color-text-secondary);
    font-size: 0.85rem;
}

/* ===== Mode Tabs ===== */
.mode-tabs {
    display: flex;
    gap: 4px;
    background: var(--color-surface);
    border: 1px solid var(--color-border);
    border-radius: var(--radius);
    padding: 4px;
    margin-bottom: 16px;
}

.mode-tab {
    flex: 1;
    padding: 10px 16px;
    border: none;
    border-radius: var(--radius-sm);
    background: transparent;
    color: var(--color-text-secondary);
    font-family: var(--font);
    font-size: 0.95rem;
    font-weight: 600;
    cursor: pointer;
    transition: all var(--transition);
}

.mode-tab:hover {
    color: var(--color-text);
    background: rgba(255, 255, 255, 0.05);
}

.mode-tab.active {
    background: var(--color-accent);
    color: #fff;
    box-shadow: 0 2px 8px rgba(124, 92, 255, 0.3);
}

/* ===== Format Toggles ===== */
.format-toggles {
    display: flex;
    align-items: center;
    gap: 10px;
    background: var(--color-surface);
    border: 1px solid var(--color-border);
    border-radius: var(--radius);
    padding: 12px 20px;
    margin-bottom: 16px;
    flex-wrap: wrap;
}

.format-toggles__label {
    font-size: 0.9rem;
    font-weight: 600;
    color: var(--color-text-secondary);
    margin-right: 4px;
    width: 100%;
    margin-bottom: 2px;
}

.format-toggle {
    display: inline-flex;
    align-items: center;
    gap: 6px;
    padding: 6px 14px;
    border-radius: 20px;
    cursor: pointer;
    border: 1px solid var(--color-border);
    background: var(--color-surface-2);
    transition: all var(--transition);
    user-select: none;
}

.format-toggle:has(input:checked) {
    border-color: var(--color-accent);
    background: rgba(124, 92, 255, 0.15);
}

.format-toggle--ig:has(input:checked) {
    border-color: var(--color-ig);
    background: rgba(225, 48, 108, 0.15);
}

.format-toggle--igstory:has(input:checked) {
    border-color: #c13584;
    background: rgba(193, 53, 132, 0.15);
}

.format-toggle--fb:has(input:checked) {
    border-color: var(--color-fb);
    background: rgba(24, 119, 242, 0.15);
}

.format-toggle--web:has(input:checked) {
    border-color: var(--color-web);
    background: rgba(245, 158, 11, 0.15);
}

.format-toggle--shopify:has(input:checked) {
    border-color: #96bf47;
    background: rgba(150, 191, 71, 0.15);
}

.format-toggle input[type="checkbox"],
.format-toggle input[type="radio"] {
    accent-color: var(--color-accent);
    width: 16px;
    height: 16px;
    cursor: pointer;
}

.format-toggle--web input[type="radio"] {
    accent-color: var(--color-web);
}

.format-toggle--shopify input[type="radio"] {
    accent-color: #96bf47;
}

.format-toggle__badge {
    font-size: 0.8rem;
    font-weight: 700;
}

.format-toggle__size {
    font-size: 0.78rem;
    color: var(--color-text-secondary);
    font-variant-numeric: tabular-nums;
}

.format-toggle:has(input:checked) .format-toggle__size {
    color: var(--color-text);
}

/* ===== Controls ===== */
.controls {
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: 16px;
    background: var(--color-surface);
    border: 1px solid var(--color-border);
    border-radius: var(--radius);
    padding: 16px 20px;
    margin-bottom: 20px;
    flex-wrap: wrap;
}

.controls__group {
    flex: 1;
    min-width: 200px;
}

.controls__label {
    display: flex;
    align-items: center;
    gap: 8px;
    font-size: 0.9rem;
    font-weight: 500;
    margin-bottom: 8px;
}

.controls__value {
    color: var(--color-accent);
    font-weight: 600;
    font-variant-numeric: tabular-nums;
}

.controls__slider {
    width: 100%;
    height: 6px;
    -webkit-appearance: none;
    appearance: none;
    background: var(--color-surface-2);
    border-radius: 3px;
    outline: none;
    cursor: pointer;
}

.controls__slider::-webkit-slider-thumb {
    -webkit-appearance: none;
    width: 20px;
    height: 20px;
    border-radius: 50%;
    background: var(--color-accent);
    cursor: pointer;
    transition: transform var(--transition);
}

.controls__slider::-webkit-slider-thumb:hover {
    transform: scale(1.2);
}

.controls__slider::-moz-range-thumb {
    width: 20px;
    height: 20px;
    border: none;
    border-radius: 50%;
    background: var(--color-accent);
    cursor: pointer;
}

.controls__actions {
    display: flex;
    gap: 8px;
}

/* ===== Source Container ===== */
.source-container {
    margin-bottom: 24px;
}

.source-container__hint {
    text-align: center;
    font-size: 0.85rem;
    color: var(--color-text-secondary);
    margin-bottom: 8px;
}

.source-viewport {
    position: relative;
    width: 100%;
    max-height: 500px;
    overflow: hidden;
    border-radius: var(--radius);
    border: 1px solid var(--color-border);
    background: #000;
    cursor: grab;
    display: flex;
    align-items: center;
    justify-content: center;
}

.source-viewport:active {
    cursor: grabbing;
}

#sourceCanvas {
    display: block;
    max-width: 100%;
    max-height: 500px;
    pointer-events: none;
}

/* ===== Preview Cards ===== */
.previews {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(240px, 1fr));
    gap: 20px;
    margin-bottom: 24px;
}

.preview-card {
    background: var(--color-surface);
    border: 1px solid var(--color-border);
    border-radius: var(--radius);
    padding: 16px;
    transition: transform var(--transition), box-shadow var(--transition);
}

.preview-card--wide {
    max-width: 600px;
    margin: 0 auto;
}

.preview-card.hidden {
    display: none;
}

.preview-card:hover {
    transform: translateY(-2px);
    box-shadow: var(--shadow);
}

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

.preview-card__badge {
    display: inline-block;
    padding: 3px 10px;
    border-radius: 20px;
    font-size: 0.8rem;
    font-weight: 700;
    letter-spacing: 0.5px;
}

.preview-card__badge--ig {
    background: linear-gradient(135deg, #f58529, #dd2a7b, #8134af);
    color: #fff;
}

.preview-card__badge--igstory {
    background: linear-gradient(135deg, #c13584, #833ab4, #5851db);
    color: #fff;
}

.preview-card__badge--fb {
    background: var(--color-fb);
    color: #fff;
}

.preview-card__badge--web {
    background: linear-gradient(135deg, #f59e0b, #d97706);
    color: #fff;
}

.preview-card__badge--shopify {
    background: linear-gradient(135deg, #96bf47, #5e8e3e);
    color: #fff;
}

.preview-card__size {
    font-size: 0.8rem;
    color: var(--color-text-secondary);
    font-variant-numeric: tabular-nums;
}

.preview-card__canvas-wrap {
    width: 100%;
    border-radius: var(--radius-sm);
    overflow: hidden;
    background: #000;
    margin-bottom: 12px;
}

.preview-card__canvas-wrap--ig {
    aspect-ratio: 4 / 5;
}

.preview-card__canvas-wrap--igstory {
    aspect-ratio: 9 / 16;
}

.preview-card__canvas-wrap--fb {
    aspect-ratio: 1 / 1;
}

.preview-card__canvas-wrap canvas {
    width: 100%;
    height: 100%;
    display: block;
    object-fit: contain;
}

/* ===== Resolution Warning ===== */
.resolution-warning {
    background: rgba(245, 158, 11, 0.15);
    border: 1px solid rgba(245, 158, 11, 0.4);
    border-radius: var(--radius-sm);
    padding: 8px 12px;
    margin-bottom: 10px;
    font-size: 0.8rem;
    color: #fbbf24;
    font-weight: 500;
    text-align: center;
}

/* ===== Buttons ===== */
.btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: 6px;
    padding: 10px 20px;
    border: none;
    border-radius: var(--radius-sm);
    font-family: var(--font);
    font-size: 0.9rem;
    font-weight: 600;
    cursor: pointer;
    transition: background var(--transition), transform var(--transition);
    white-space: nowrap;
}

.btn:active {
    transform: scale(0.97);
}

.btn--primary {
    width: 100%;
    color: #fff;
}

.btn--ig {
    background: linear-gradient(135deg, #f58529, #dd2a7b);
}

.btn--ig:hover {
    background: linear-gradient(135deg, #dd2a7b, #8134af);
}

.btn--igstory {
    background: linear-gradient(135deg, #c13584, #833ab4);
}

.btn--igstory:hover {
    background: linear-gradient(135deg, #833ab4, #5851db);
}

.btn--fb {
    background: var(--color-fb);
}

.btn--fb:hover {
    background: var(--color-fb-hover);
}

.btn--web {
    background: linear-gradient(135deg, #f59e0b, #d97706);
}

.btn--web:hover {
    background: linear-gradient(135deg, #d97706, #b45309);
}

.btn--shopify {
    background: linear-gradient(135deg, #96bf47, #5e8e3e);
}

.btn--shopify:hover {
    background: linear-gradient(135deg, #5e8e3e, #3d6127);
}

.btn--secondary {
    background: var(--color-surface-2);
    color: var(--color-text);
    border: 1px solid var(--color-border);
}

.btn--secondary:hover {
    background: var(--color-border);
}

.btn--accent {
    background: linear-gradient(135deg, var(--color-accent), #a855f7);
    color: #fff;
    padding: 14px 32px;
    font-size: 1rem;
}

.btn--accent:hover {
    background: linear-gradient(135deg, var(--color-accent-hover), #c084fc);
}

/* ===== Image Navigation (batch) ===== */
.image-nav {
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 16px;
    margin-bottom: 16px;
}

.image-nav__counter {
    font-size: 1rem;
    font-weight: 600;
    color: var(--color-text);
    font-variant-numeric: tabular-nums;
    min-width: 60px;
    text-align: center;
}

.image-nav__btn {
    padding: 8px 16px;
    font-size: 1rem;
}

/* ===== Thumbnail Strip ===== */
.thumbnail-strip {
    display: flex;
    gap: 8px;
    overflow-x: auto;
    padding: 8px 12px;
    margin-bottom: 16px;
    background: var(--color-surface);
    border: 1px solid var(--color-border);
    border-radius: var(--radius);
    scrollbar-width: thin;
    scrollbar-color: var(--color-border) transparent;
}

.thumbnail-strip::-webkit-scrollbar {
    height: 6px;
}

.thumbnail-strip::-webkit-scrollbar-thumb {
    background: var(--color-border);
    border-radius: 3px;
}

.thumbnail {
    flex-shrink: 0;
    width: 56px;
    height: 56px;
    border-radius: 6px;
    border: 2px solid transparent;
    overflow: hidden;
    cursor: pointer;
    opacity: 0.6;
    transition: all var(--transition);
    position: relative;
}

.thumbnail img {
    width: 100%;
    height: 100%;
    object-fit: cover;
    display: block;
}

.thumbnail:hover {
    opacity: 0.9;
    border-color: var(--color-text-secondary);
}

.thumbnail.active {
    opacity: 1;
    border-color: var(--color-accent);
    box-shadow: 0 0 8px rgba(124, 92, 255, 0.4);
}

.thumbnail__index {
    position: absolute;
    bottom: 2px;
    right: 2px;
    background: rgba(0, 0, 0, 0.7);
    color: #fff;
    font-size: 0.6rem;
    padding: 1px 4px;
    border-radius: 3px;
    font-weight: 600;
}

/* ===== Batch Download ===== */
.btn--batch {
    background: linear-gradient(135deg, #34d399, #059669);
}

.btn--batch:hover {
    background: linear-gradient(135deg, #059669, #047857);
}

.batch-hint {
    color: var(--color-text-secondary);
    font-size: 0.8rem;
    margin-top: 8px;
}

/* ===== Download All ===== */
.download-all {
    text-align: center;
}

/* ===== Footer ===== */
.footer {
    text-align: center;
    margin-top: 48px;
    padding-top: 24px;
    border-top: 1px solid var(--color-border);
    color: var(--color-text-secondary);
    font-size: 0.8rem;
}

/* ===== Responsive ===== */
@media (max-width: 640px) {
    .header__title {
        font-size: 1.5rem;
    }

    .controls {
        flex-direction: column;
        align-items: stretch;
    }

    .controls__actions {
        justify-content: center;
    }

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

    .format-toggles {
        justify-content: center;
    }

    .mode-tabs {
        flex-direction: column;
    }
}