/* ===== CSS Variables ===== */
:root {
    --primary-color: #6366f1;
    --primary-hover: #4f46e5;
    --success-color: #10b981;
    --success-hover: #059669;
    --danger-color: #ef4444;
    --warning-color: #f59e0b;
    --bg-color: #0f172a;
    --card-bg: #1e293b;
    --text-primary: #f1f5f9;
    --text-secondary: #94a3b8;
    --border-color: #334155;
    --gradient-1: linear-gradient(135deg, #6366f1 0%, #8b5cf6 100%);
    --gradient-2: linear-gradient(135deg, #10b981 0%, #059669 100%);
    --shadow: 0 4px 6px -1px rgba(0, 0, 0, 0.1), 0 2px 4px -1px rgba(0, 0, 0, 0.06);
    --shadow-lg: 0 10px 15px -3px rgba(0, 0, 0, 0.1), 0 4px 6px -2px rgba(0, 0, 0, 0.05);
    --radius: 12px;
    --radius-sm: 8px;
}

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

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

.container {
    max-width: 900px;
    margin: 0 auto;
    padding: 2rem 1rem;
}

/* ===== Header ===== */
.header {
    text-align: center;
    margin-bottom: 3rem;
}

.logo {
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 0.75rem;
    margin-bottom: 0.5rem;
}

.logo-icon {
    font-size: 2.5rem;
    animation: bounce 2s infinite;
}

@keyframes bounce {
    0%, 100% { transform: translateY(0); }
    50% { transform: translateY(-5px); }
}

.logo h1 {
    font-size: 2.5rem;
    font-weight: 700;
    background: var(--gradient-1);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

.subtitle {
    color: var(--text-secondary);
    font-size: 1.1rem;
}

/* ===== Cards ===== */
.card {
    background: var(--card-bg);
    border-radius: var(--radius);
    padding: 2rem;
    margin-bottom: 1.5rem;
    box-shadow: var(--shadow);
    border: 1px solid var(--border-color);
}

.card h2 {
    font-size: 1.5rem;
    margin-bottom: 1.5rem;
    color: var(--text-primary);
}

/* ===== Forms ===== */
.form-group {
    margin-bottom: 1rem;
}

.form-group label {
    display: block;
    margin-bottom: 0.5rem;
    color: var(--text-secondary);
    font-weight: 500;
}

.form-row {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 1rem;
    margin-bottom: 1rem;
}

.input-field,
.select-field {
    width: 100%;
    padding: 0.875rem 1rem;
    background: var(--bg-color);
    border: 1px solid var(--border-color);
    border-radius: var(--radius-sm);
    color: var(--text-primary);
    font-size: 1rem;
    font-family: inherit;
    transition: all 0.3s ease;
}

.input-field:focus,
.select-field:focus {
    outline: none;
    border-color: var(--primary-color);
    box-shadow: 0 0 0 3px rgba(99, 102, 241, 0.1);
}

.input-field::placeholder {
    color: var(--text-secondary);
}

/* Custom scrollbar for select dropdowns */
.select-field option {
    background: var(--card-bg);
    color: var(--text-primary);
    padding: 0.5rem;
}

/* Webkit scrollbar for select (when dropdown is open) */
select::-webkit-scrollbar {
    width: 8px;
}

select::-webkit-scrollbar-track {
    background: var(--bg-color);
    border-radius: 4px;
}

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

select::-webkit-scrollbar-thumb:hover {
    background: var(--primary-color);
}

/* ===== Buttons ===== */
.btn {
    padding: 0.875rem 1.5rem;
    border: none;
    border-radius: var(--radius-sm);
    font-size: 1rem;
    font-weight: 600;
    cursor: pointer;
    transition: all 0.3s ease;
    font-family: inherit;
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: 0.5rem;
}

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

.btn-primary {
    background: var(--gradient-1);
    color: white;
}

.btn-primary:hover:not(:disabled) {
    transform: translateY(-2px);
    box-shadow: 0 4px 12px rgba(99, 102, 241, 0.4);
}

.btn-success {
    background: var(--gradient-2);
    color: white;
}

.btn-success:hover:not(:disabled) {
    transform: translateY(-2px);
    box-shadow: 0 4px 12px rgba(16, 185, 129, 0.4);
}

.btn-sm {
    padding: 0.5rem 1rem;
    font-size: 0.875rem;
    background: var(--bg-color);
    border: 1px solid var(--border-color);
    color: var(--text-primary);
}

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

.btn-large {
    width: 100%;
    padding: 1rem;
    font-size: 1.125rem;
    margin-top: 1rem;
}

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

.btn-danger:hover {
    background: #dc2626;
}

/* ===== Chapter Info ===== */
.chapter-info {
    display: flex;
    align-items: center;
    gap: 1rem;
    margin-bottom: 1.5rem;
    flex-wrap: wrap;
}

.badge {
    background: var(--primary-color);
    color: white;
    padding: 0.375rem 0.75rem;
    border-radius: 9999px;
    font-size: 0.875rem;
    font-weight: 600;
}

.title-preview {
    color: var(--text-secondary);
    font-size: 0.95rem;
}

.quick-select {
    display: flex;
    gap: 0.5rem;
    margin-bottom: 1.5rem;
    flex-wrap: wrap;
}

/* ===== Progress ===== */
.progress-container {
    margin-bottom: 1rem;
}

.progress-bar {
    height: 12px;
    background: var(--bg-color);
    border-radius: 9999px;
    overflow: hidden;
    margin-bottom: 0.75rem;
}

.progress-fill {
    height: 100%;
    background: var(--gradient-2);
    border-radius: 9999px;
    transition: width 0.5s ease;
    position: relative;
    overflow: hidden;
}

.progress-fill::after {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background: linear-gradient(
        90deg,
        transparent,
        rgba(255, 255, 255, 0.3),
        transparent
    );
    animation: shimmer 2s infinite;
}

@keyframes shimmer {
    0% { transform: translateX(-100%); }
    100% { transform: translateX(100%); }
}

.progress-text {
    display: flex;
    justify-content: space-between;
    color: var(--text-secondary);
    font-size: 0.875rem;
}

#progressPercent {
    font-weight: 600;
    color: var(--success-color);
}

.current-chapter {
    background: var(--bg-color);
    padding: 1rem;
    border-radius: var(--radius-sm);
    display: flex;
    align-items: center;
    gap: 0.75rem;
    margin-top: 1rem;
}

.chapter-indicator {
    font-size: 1.25rem;
}

#chapterName {
    color: var(--text-secondary);
    font-size: 0.95rem;
}

/* ===== Downloads List ===== */
.downloads-list {
    display: flex;
    flex-direction: column;
    gap: 0.75rem;
}

.download-item {
    background: var(--bg-color);
    padding: 1.25rem;
    border-radius: var(--radius-sm);
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: 1rem;
    border: 1px solid var(--border-color);
    transition: all 0.3s ease;
}

.download-item:hover {
    border-color: var(--primary-color);
    transform: translateX(4px);
}

.download-info {
    flex: 1;
}

.download-name {
    font-weight: 600;
    color: var(--text-primary);
    margin-bottom: 0.25rem;
}

.download-meta {
    font-size: 0.875rem;
    color: var(--text-secondary);
}

.download-actions {
    display: flex;
    gap: 0.5rem;
}

.empty-state {
    text-align: center;
    color: var(--text-secondary);
    padding: 2rem;
}

/* ===== Toast Notifications ===== */
.toast-container {
    position: fixed;
    bottom: 2rem;
    right: 2rem;
    display: flex;
    flex-direction: column;
    gap: 0.75rem;
    z-index: 1000;
}

.toast {
    background: var(--card-bg);
    padding: 1rem 1.5rem;
    border-radius: var(--radius-sm);
    box-shadow: var(--shadow-lg);
    border-left: 4px solid var(--primary-color);
    animation: slideIn 0.3s ease;
    max-width: 400px;
}

.toast.success {
    border-left-color: var(--success-color);
}

.toast.error {
    border-left-color: var(--danger-color);
}

.toast.warning {
    border-left-color: var(--warning-color);
}

@keyframes slideIn {
    from {
        transform: translateX(100%);
        opacity: 0;
    }
    to {
        transform: translateX(0);
        opacity: 1;
    }
}

/* ===== Footer ===== */
.footer {
    text-align: center;
    margin-top: 3rem;
    padding-top: 2rem;
    border-top: 1px solid var(--border-color);
    color: var(--text-secondary);
}

.footer a {
    color: var(--primary-color);
    text-decoration: none;
}

.footer a:hover {
    text-decoration: underline;
}

/* ===== Responsive ===== */
@media (max-width: 640px) {
    .container {
        padding: 1rem;
    }

    .logo h1 {
        font-size: 1.75rem;
    }

    .card {
        padding: 1.5rem;
    }

    .form-row {
        grid-template-columns: 1fr;
    }

    .download-item {
        flex-direction: column;
        align-items: flex-start;
    }

    .download-actions {
        width: 100%;
        justify-content: flex-end;
    }

    .toast-container {
        left: 1rem;
        right: 1rem;
        bottom: 1rem;
    }

    .toast {
        max-width: 100%;
    }
}

/* ===== Loading Animation ===== */
.btn-loader {
    animation: spin 1s linear infinite;
}

@keyframes spin {
    from { transform: rotate(0deg); }
    to { transform: rotate(360deg); }
}

/* ===== Status Colors ===== */
.status-analyzing { color: var(--primary-color); }
.status-fetching { color: var(--warning-color); }
.status-downloading { color: var(--success-color); }
.status-complete { color: var(--success-color); }
.status-error { color: var(--danger-color); }

/* ===== Checkbox ===== */
.checkbox-group {
    margin: 1.5rem 0;
}

.checkbox-label {
    display: flex;
    align-items: center;
    gap: 0.75rem;
    cursor: pointer;
    user-select: none;
}

.checkbox-label input[type="checkbox"] {
    width: 20px;
    height: 20px;
    accent-color: var(--primary-color);
    cursor: pointer;
}

.checkbox-text {
    font-weight: 500;
    color: var(--text-primary);
}

.checkbox-hint {
    margin-top: 0.5rem;
    font-size: 0.875rem;
}

/* ===== Storage Info ===== */
.storage-info {
    margin-top: 1rem;
    display: flex;
    justify-content: center;
}

.storage-badge {
    background: var(--bg-color);
    padding: 0.5rem 1rem;
    border-radius: 9999px;
    font-size: 0.875rem;
    color: var(--text-secondary);
    border: 1px solid var(--border-color);
}

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

/* ===== Countdown Timer ===== */
.countdown-timer {
    font-weight: 600;
    color: var(--warning-color);
    display: inline-flex;
    align-items: center;
    gap: 0.25rem;
}

.countdown-timer.urgent {
    color: var(--danger-color);
    animation: pulse 1s infinite;
}

@keyframes pulse {
    0%, 100% { opacity: 1; }
    50% { opacity: 0.5; }
}

.countdown-timer.urgent {
    color: var(--danger-color);
    animation: pulse 1s infinite;
}

@keyframes pulse {
    0%, 100% { opacity: 1; }
    50% { opacity: 0.5; }
}

/* ===== Auto Delete Hint ===== */
.auto-delete-hint {
    margin-top: 1rem;
    padding: 0.75rem 1rem;
    background: var(--bg-color);
    border-radius: var(--radius-sm);
    font-size: 0.875rem;
    color: var(--text-secondary);
    border-left: 3px solid var(--warning-color);
}

/* ===== Storage Warning ===== */
.storage-warning {
    display: flex;
    align-items: center;
    gap: 0.75rem;
    margin-top: 1rem;
    padding: 1rem 1.25rem;
    background: rgba(239, 68, 68, 0.1);
    border: 1px solid var(--danger-color);
    border-radius: var(--radius-sm);
    font-size: 0.95rem;
}

.warning-icon {
    font-size: 1.25rem;
}

.warning-text {
    color: var(--danger-color);
    font-weight: 500;
}

/* ===== Paused Badge ===== */
.paused-badge {
    display: inline-block;
    background: var(--warning-color);
    color: white;
    padding: 0.125rem 0.75rem;
    border-radius: 4px;
    font-size: 0.75rem;
    font-weight: 600;
    margin-left: 0.5rem;
}

/* ===== Paused Timer ===== */
.paused-timer {
    color: var(--warning-color);
    font-weight: 600;
}

/* ===== Download Item with Timer ===== */
.download-item {
    transition: all 0.3s ease;
}

.download-item.is-zip {
    border-left: 3px solid var(--primary-color);
    background: rgba(99, 102, 241, 0.05);
}

.download-item.paused {
    border-left: 3px solid var(--warning-color);
    background: rgba(245, 158, 11, 0.05);
}

.download-item.paused .countdown-timer {
    color: var(--warning-color);
}

.download-item[style*="opacity: 0"] {
    opacity: 0 !important;
    transform: translateX(-20px) !important;
}

.download-meta {
    display: flex;
    flex-wrap: wrap;
    gap: 0.5rem;
    align-items: center;
}

.zip-badge {
    display: inline-block;
    background: var(--primary-color);
    color: white;
    padding: 0.125rem 0.5rem;
    border-radius: 4px;
    font-size: 0.75rem;
    font-weight: 600;
    margin-left: 0.5rem;
}

/* ===== Download Actions Button Disabled ===== */
.download-actions button:disabled {
    opacity: 0.5;
    cursor: not-allowed;
}

/* ===== Chapter Progress List ===== */
.chapter-list {
    margin-top: 1rem;
    max-height: 400px;
    overflow-y: auto;
    background: var(--bg-color);
    border-radius: var(--radius-sm);
    border: 1px solid var(--border-color);
}

.chapter-item {
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: 0.75rem 1rem;
    border-bottom: 1px solid var(--border-color);
    transition: all 0.3s ease;
}

.chapter-item:last-child {
    border-bottom: none;
}

.chapter-item:hover {
    background: rgba(99, 102, 241, 0.05);
}

.chapter-info {
    display: flex;
    align-items: center;
    gap: 0.75rem;
    flex: 1;
}

.chapter-number {
    font-weight: 600;
    color: var(--primary-color);
    min-width: 2rem;
}

.chapter-title {
    flex: 1;
    color: var(--text-primary);
    font-size: 0.95rem;
    white-space: nowrap;
    overflow: hidden;
    text-overflow: ellipsis;
}

.chapter-status {
    display: flex;
    align-items: center;
    gap: 0.5rem;
    font-size: 0.875rem;
}

.chapter-status.pending {
    color: var(--text-secondary);
}

.chapter-status.downloading {
    color: var(--primary-color);
}

.chapter-status.downloading::before {
    content: '⏳';
}

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

.chapter-status.complete::before {
    content: '✅';
}

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

.chapter-status.error::before {
    content: '❌';
}

.chapter-images {
    color: var(--text-secondary);
    font-size: 0.875rem;
    margin-left: 0.5rem;
}

/* Custom scrollbar for chapter list */
.chapter-list::-webkit-scrollbar {
    width: 8px;
}

.chapter-list::-webkit-scrollbar-track {
    background: var(--bg-color);
    border-radius: 4px;
}

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

.chapter-list::-webkit-scrollbar-thumb:hover {
    background: var(--primary-color);
}