/* ===== CSS Variables ===== */
:root {
    --bg-primary: #ffffff;
    --bg-secondary: #f8f9fa;
    --bg-tertiary: #f1f3f4;
    --bg-card: #ffffff;
    --bg-hover: #f5f5f5;

    --text-primary: #1a1a1a;
    --text-secondary: #5f6368;
    --text-muted: #9aa0a6;

    --accent-primary: #ff6d00;
    --accent-secondary: #ff8f00;
    --accent-glow: rgba(255, 109, 0, 0.15);
    --accent-light: rgba(255, 109, 0, 0.1);

    --success: #0f9d58;
    --success-bg: rgba(15, 157, 88, 0.1);
    --warning: #f9ab00;
    --warning-bg: rgba(249, 171, 0, 0.1);
    --error: #ea4335;
    --error-bg: rgba(234, 67, 53, 0.1);

    --border: #e0e0e0;
    --border-hover: #d0d0d0;

    --radius-sm: 8px;
    --radius-md: 12px;
    --radius-lg: 16px;
    --radius-xl: 24px;

    --shadow-sm: 0 1px 3px rgba(0, 0, 0, 0.08);
    --shadow-md: 0 4px 12px rgba(0, 0, 0, 0.1);
    --shadow-lg: 0 8px 24px rgba(0, 0, 0, 0.12);
    --shadow-glow: 0 4px 20px var(--accent-glow);

    --transition-fast: 150ms ease;
    --transition-normal: 250ms ease;
    --transition-slow: 350ms ease;
}

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

html {
    font-size: 16px;
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
}

body {
    font-family: 'Inter', -apple-system, BlinkMacSystemFont, sans-serif;
    background: var(--bg-secondary);
    color: var(--text-primary);
    min-height: 100vh;
    line-height: 1.6;
}

/* ===== App Container ===== */
.app-container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 24px;
    min-height: 100vh;
    display: flex;
    flex-direction: column;
}

/* ===== Header ===== */
.header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 20px 0;
    border-bottom: 1px solid var(--border);
    background: var(--bg-primary);
    margin: 0 -24px;
    padding-left: 24px;
    padding-right: 24px;
}

.logo {
    display: flex;
    align-items: center;
    gap: 12px;
    color: var(--text-primary);
    font-size: 1.25rem;
    font-weight: 600;
}

.logo img {
    height: 40px;
    width: auto;
    object-fit: contain;
}

.logo span {
    color: var(--accent-primary);
}

.header-actions {
    display: flex;
    gap: 12px;
}

/* ===== Buttons ===== */
.btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: 8px;
    padding: 10px 20px;
    font-size: 0.875rem;
    font-weight: 500;
    border-radius: var(--radius-md);
    border: none;
    cursor: pointer;
    transition: all var(--transition-fast);
    font-family: inherit;
}

.btn:disabled {
    opacity: 0.5;
    cursor: not-allowed;
}

.btn-primary {
    background: linear-gradient(135deg, var(--accent-primary), var(--accent-secondary));
    color: white;
    box-shadow: var(--shadow-sm), var(--shadow-glow);
}

.btn-primary:hover:not(:disabled) {
    transform: translateY(-2px);
    box-shadow: var(--shadow-md), 0 6px 24px var(--accent-glow);
}

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

.btn-secondary:hover:not(:disabled) {
    background: var(--bg-tertiary);
    border-color: var(--border-hover);
}

.btn-ghost {
    background: transparent;
    color: var(--text-secondary);
}

.btn-ghost:hover:not(:disabled) {
    background: var(--bg-tertiary);
    color: var(--text-primary);
}

.btn-sm {
    padding: 6px 12px;
    font-size: 0.75rem;
}

/* ===== Main Content ===== */
.main-content {
    flex: 1;
    padding: 32px 0;
    display: flex;
    flex-direction: column;
    gap: 32px;
}

/* ===== Upload Section ===== */
.upload-section {
    width: 100%;
}

.drop-zone {
    border: 2px dashed var(--accent-primary);
    border-radius: var(--radius-xl);
    padding: 64px 32px;
    text-align: center;
    cursor: pointer;
    transition: all var(--transition-normal);
    background: var(--bg-primary);
}

.drop-zone:hover,
.drop-zone.dragover {
    border-color: var(--accent-primary);
    background: var(--accent-light);
    box-shadow: var(--shadow-glow);
}

.drop-zone.dragover {
    transform: scale(1.01);
}

.drop-zone-content {
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 16px;
}

.drop-zone-icon {
    width: 80px;
    height: 80px;
    display: flex;
    align-items: center;
    justify-content: center;
    background: var(--accent-light);
    border-radius: 50%;
    color: var(--accent-primary);
}

.drop-zone h2 {
    font-size: 1.5rem;
    font-weight: 600;
    color: var(--text-primary);
}

.drop-zone p {
    color: var(--text-muted);
    font-size: 0.875rem;
}

/* ===== File Info ===== */
.file-info {
    background: var(--bg-primary);
    border: 1px solid var(--border);
    border-radius: var(--radius-lg);
    padding: 24px;
    box-shadow: var(--shadow-sm);
}

.file-info-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    flex-wrap: wrap;
    gap: 16px;
}

.file-details {
    display: flex;
    align-items: center;
    gap: 16px;
}

.file-details svg {
    color: var(--accent-primary);
}

.file-details h3 {
    font-size: 1rem;
    font-weight: 600;
    color: var(--text-primary);
}

.file-details p {
    font-size: 0.875rem;
    color: var(--text-secondary);
}

/* ===== Progress ===== */
.progress-container {
    margin-top: 24px;
    padding-top: 24px;
    border-top: 1px solid var(--border);
}

.progress-header {
    display: flex;
    justify-content: space-between;
    margin-bottom: 12px;
    font-size: 0.875rem;
}

#progressText {
    color: var(--text-secondary);
}

#progressCount {
    color: var(--accent-primary);
    font-weight: 600;
}

.progress-bar {
    height: 8px;
    background: var(--bg-tertiary);
    border-radius: 4px;
    overflow: hidden;
}

.progress-fill {
    height: 100%;
    width: 0%;
    background: linear-gradient(90deg, var(--accent-primary), var(--accent-secondary));
    border-radius: 4px;
    transition: width var(--transition-normal);
}

/* ===== Pages Section ===== */
.pages-section {
    flex: 1;
}

.section-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 24px;
}

.section-header h2 {
    font-size: 1.25rem;
    font-weight: 600;
    color: var(--text-primary);
}

.pages-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(320px, 1fr));
    gap: 20px;
}

/* ===== Page Card ===== */
.page-card {
    background: var(--bg-primary);
    border: 1px solid var(--border);
    border-radius: var(--radius-lg);
    overflow: hidden;
    transition: all var(--transition-normal);
    box-shadow: var(--shadow-sm);
}

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

.page-card-preview {
    aspect-ratio: 4/3;
    background: var(--bg-tertiary);
    display: flex;
    align-items: center;
    justify-content: center;
    border-bottom: 1px solid var(--border);
    position: relative;
    overflow: hidden;
}

.page-card-preview canvas {
    max-width: 100%;
    max-height: 100%;
    object-fit: contain;
}

.page-card-preview .placeholder {
    color: var(--text-muted);
    font-size: 0.875rem;
}

.page-card-content {
    padding: 16px;
}

.page-card-header {
    display: flex;
    justify-content: space-between;
    align-items: flex-start;
    margin-bottom: 12px;
}

.page-number {
    font-size: 0.75rem;
    font-weight: 600;
    color: var(--accent-primary);
    background: var(--accent-light);
    padding: 4px 8px;
    border-radius: var(--radius-sm);
}

.page-status {
    display: flex;
    align-items: center;
    gap: 6px;
    font-size: 0.75rem;
    font-weight: 500;
}

.page-status.pending {
    color: var(--text-muted);
}

.page-status.processing {
    color: var(--warning);
}

.page-status.success {
    color: var(--success);
}

.page-status.error {
    color: var(--error);
}

.status-dot {
    width: 8px;
    height: 8px;
    border-radius: 50%;
    background: currentColor;
}

.page-status.processing .status-dot {
    animation: pulse 1s ease-in-out infinite;
}

@keyframes pulse {

    0%,
    100% {
        opacity: 1;
    }

    50% {
        opacity: 0.4;
    }
}

.page-card-info {
    min-height: 60px;
}

.page-card-info h4 {
    font-size: 0.875rem;
    font-weight: 600;
    color: var(--text-primary);
    margin-bottom: 4px;
    display: -webkit-box;
    -webkit-line-clamp: 2;
    -webkit-box-orient: vertical;
    overflow: hidden;
}

.page-card-info p {
    font-size: 0.75rem;
    color: var(--text-secondary);
}

.page-card-actions {
    display: flex;
    gap: 8px;
    margin-top: 12px;
    padding-top: 12px;
    border-top: 1px solid var(--border);
}

.page-card-actions .btn {
    flex: 1;
}

/* ===== Toast ===== */
.toast-container {
    position: fixed;
    bottom: 24px;
    right: 24px;
    display: flex;
    flex-direction: column;
    gap: 12px;
    z-index: 1000;
}

.toast {
    display: flex;
    align-items: center;
    gap: 12px;
    padding: 16px 20px;
    background: var(--bg-primary);
    border: 1px solid var(--border);
    border-radius: var(--radius-md);
    box-shadow: var(--shadow-lg);
    animation: slideIn 0.3s ease;
    max-width: 400px;
}

@keyframes slideIn {
    from {
        transform: translateX(100%);
        opacity: 0;
    }

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

.toast.success {
    border-left: 4px solid var(--success);
}

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

.toast.warning {
    border-left: 4px solid var(--warning);
}

.toast.info {
    border-left: 4px solid var(--accent-primary);
}

.toast-message {
    flex: 1;
    font-size: 0.875rem;
    color: var(--text-primary);
}

.toast-close {
    background: none;
    border: none;
    color: var(--text-muted);
    cursor: pointer;
    padding: 4px;
    display: flex;
}

.toast-close:hover {
    color: var(--text-primary);
}

/* ===== Utilities ===== */
.hidden {
    display: none !important;
}

/* ===== Loading Spinner ===== */
.spinner {
    width: 20px;
    height: 20px;
    border: 2px solid var(--border);
    border-top-color: var(--accent-primary);
    border-radius: 50%;
    animation: spin 0.8s linear infinite;
}

@keyframes spin {
    to {
        transform: rotate(360deg);
    }
}

/* ===== Responsive ===== */
@media (max-width: 768px) {
    .app-container {
        padding: 0 16px;
    }

    .header {
        flex-direction: column;
        gap: 16px;
        text-align: center;
        margin: 0 -16px;
        padding-left: 16px;
        padding-right: 16px;
    }

    .drop-zone {
        padding: 48px 24px;
    }

    .file-info-header {
        flex-direction: column;
        text-align: center;
    }

    .file-details {
        flex-direction: column;
    }

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

    .section-header {
        flex-direction: column;
        gap: 16px;
    }
}