/* ============================================================================
   HSK Learning Platform - Offline Practice Manager Styles
   ============================================================================ */

.offline-manager-modal {
    border: none;
    padding: 0;
    background: transparent;
    max-width: 620px;
    width: 92vw;
    margin: auto;
    border-radius: var(--radius-xl, 16px);
    box-shadow: 0 25px 50px -12px rgba(0, 0, 0, 0.35);
    overflow: hidden;
}

.offline-manager-modal::backdrop {
    background: rgba(0, 0, 0, 0.65);
    backdrop-filter: blur(5px);
    -webkit-backdrop-filter: blur(5px);
}

.offline-modal-card {
    background: var(--bg-panel, #ffffff);
    border: 1px solid var(--color-border, #e4e4e7);
    border-radius: var(--radius-xl, 16px);
    padding: 24px;
    color: var(--text-main, #18181b);
    display: flex;
    flex-direction: column;
    gap: 20px;
    max-height: 88vh;
    overflow-y: auto;
}

.offline-modal-header {
    display: flex;
    align-items: flex-start;
    justify-content: space-between;
    gap: 12px;
}

.offline-modal-brand {
    display: flex;
    align-items: center;
    gap: 14px;
}

.offline-modal-icon-badge {
    width: 48px;
    height: 48px;
    border-radius: 14px;
    background: linear-gradient(135deg, var(--color-primary, #e53935) 0%, #b71c1c 100%);
    color: #ffffff;
    display: flex;
    align-items: center;
    justify-content: center;
    box-shadow: 0 4px 14px var(--color-primary-glow, rgba(229, 57, 53, 0.3));
    flex-shrink: 0;
}

.offline-modal-header h3 {
    font-size: 1.2rem;
    font-weight: 700;
    margin: 0 0 4px 0;
    color: var(--text-main, #18181b);
}

.offline-modal-subtitle {
    font-size: 0.85rem;
    color: var(--text-muted, #71717a);
    margin: 0;
    line-height: 1.4;
}

/* Status Grid */
.offline-status-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(130px, 1fr));
    gap: 10px;
}

.offline-stat-card {
    background: var(--color-bg-hover, #f4f4f5);
    border: 1px solid var(--color-border-subtle, #f4f4f5);
    border-radius: var(--radius-lg, 12px);
    padding: 12px;
    display: flex;
    flex-direction: column;
    gap: 4px;
    transition: transform 0.2s ease, border-color 0.2s ease;
}

.offline-stat-header {
    display: flex;
    align-items: center;
    justify-content: space-between;
}

.offline-stat-title {
    font-size: 0.76rem;
    font-weight: 600;
    color: var(--text-muted, #71717a);
    text-transform: uppercase;
    letter-spacing: 0.04em;
}

.offline-stat-indicator {
    font-size: 0.85rem;
}

.offline-stat-value {
    font-size: 1.25rem;
    font-weight: 800;
    color: var(--text-main, #18181b);
    line-height: 1.2;
}

.offline-stat-detail {
    font-size: 0.75rem;
    color: var(--text-dim, #a1a1aa);
}

/* Pack Selection */
.offline-pack-section {
    display: flex;
    flex-direction: column;
    gap: 10px;
}

.offline-section-heading {
    font-size: 0.88rem;
    font-weight: 700;
    color: var(--text-main, #18181b);
    margin: 0;
    display: flex;
    align-items: center;
    gap: 6px;
}

.offline-pack-options {
    display: flex;
    flex-direction: column;
    gap: 8px;
}

.offline-pack-option {
    display: flex;
    align-items: center;
    gap: 12px;
    padding: 12px 14px;
    border: 1.5px solid var(--color-border, #e4e4e7);
    border-radius: var(--radius-lg, 12px);
    background: var(--bg-card, #ffffff);
    cursor: pointer;
    transition: all 0.2s ease;
}

.offline-pack-option:hover {
    border-color: var(--color-primary, #e53935);
    background: var(--color-bg-hover, #f4f4f5);
}

.offline-pack-option.is-selected {
    border-color: var(--color-primary, #e53935);
    background: var(--color-primary-subtle, #ffebee);
}

.offline-pack-option input[type="radio"] {
    accent-color: var(--color-primary, #e53935);
    width: 18px;
    height: 18px;
    cursor: pointer;
}

.offline-pack-info {
    flex: 1;
    display: flex;
    flex-direction: column;
    gap: 2px;
}

.offline-pack-title {
    font-size: 0.92rem;
    font-weight: 700;
    color: var(--text-main, #18181b);
}

.offline-pack-desc {
    font-size: 0.78rem;
    color: var(--text-muted, #71717a);
}

.offline-pack-badge {
    font-size: 0.72rem;
    font-weight: 700;
    padding: 3px 8px;
    border-radius: 999px;
    background: var(--color-bg-hover, #f4f4f5);
    color: var(--text-muted, #71717a);
    white-space: nowrap;
}

.offline-pack-option.is-selected .offline-pack-badge {
    background: var(--color-primary, #e53935);
    color: #ffffff;
}

/* Progress Section */
.offline-progress-section {
    display: flex;
    flex-direction: column;
    gap: 8px;
    background: var(--color-bg-hover, #f4f4f5);
    padding: 14px;
    border-radius: var(--radius-lg, 12px);
    border: 1px solid var(--color-border-subtle, #e4e4e7);
}

.offline-progress-header {
    display: flex;
    align-items: center;
    justify-content: space-between;
    font-size: 0.84rem;
}

.offline-progress-status {
    font-weight: 600;
    color: var(--text-main, #18181b);
}

.offline-progress-percent {
    font-weight: 800;
    color: var(--color-primary, #e53935);
}

.offline-progress-bar-track {
    width: 100%;
    height: 10px;
    background: var(--color-border, #e4e4e7);
    border-radius: 999px;
    overflow: hidden;
    position: relative;
}

.offline-progress-bar-fill {
    height: 100%;
    background: linear-gradient(90deg, var(--color-primary, #e53935) 0%, #facc15 100%);
    border-radius: 999px;
    width: 0%;
    transition: width 0.2s ease;
}

.offline-progress-subtext {
    font-size: 0.76rem;
    color: var(--text-muted, #71717a);
    display: flex;
    justify-content: space-between;
}

/* Action Buttons */
.offline-modal-actions {
    display: flex;
    align-items: center;
    gap: 10px;
    flex-wrap: wrap;
}

.offline-btn-primary {
    flex: 1;
    min-width: 180px;
    min-height: 44px;
    font-weight: 700;
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: 8px;
}

.offline-btn-secondary {
    min-height: 44px;
}

.offline-btn-retry {
    min-height: 44px;
    font-weight: 700;
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: 8px;
    background: #f59e0b;
    color: #ffffff;
    border: none;
    border-radius: var(--radius-md, 8px);
    padding: 0 16px;
    cursor: pointer;
    transition: all 0.2s ease;
}

.offline-btn-retry:hover {
    background: #d97706;
}

.offline-voice-val {
    font-size: 0.92rem !important;
    white-space: nowrap;
    overflow: hidden;
    text-overflow: ellipsis;
}

.offline-card-action-btn {
    background: transparent;
    border: none;
    cursor: pointer;
    font-size: 0.85rem;
    padding: 0;
    line-height: 1;
    opacity: 0.8;
    transition: opacity 0.2s;
}

.offline-card-action-btn:hover {
    opacity: 1;
}

/* Local Backup & Restore Section */
.offline-backup-section {
    display: flex;
    flex-direction: column;
    gap: 10px;
    padding: 14px;
    border-radius: var(--radius-lg, 12px);
    border: 1px solid var(--color-border-subtle, #e4e4e7);
    background: var(--color-bg-hover, #fbfbfa);
}

.offline-backup-header {
    display: flex;
    flex-direction: column;
    gap: 4px;
}

.offline-section-subheading {
    font-size: 0.78rem;
    color: var(--text-muted, #71717a);
    margin: 0;
    line-height: 1.4;
}

.offline-backup-actions {
    display: flex;
    gap: 10px;
    flex-wrap: wrap;
}

.offline-backup-btn {
    flex: 1;
    min-width: 140px;
    min-height: 38px;
    font-size: 0.82rem;
    font-weight: 600;
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: 6px;
    border-radius: var(--radius-md, 8px);
    background: var(--bg-card, #ffffff);
}

/* Informational Guide Accordion / Cards */
.offline-guide-section {
    display: flex;
    flex-direction: column;
    gap: 8px;
    margin-top: 4px;
}

.offline-guide-item {
    border: 1px solid var(--color-border-subtle, #e4e4e7);
    border-radius: var(--radius-md, 8px);
    overflow: hidden;
    background: var(--bg-card, #ffffff);
}

.offline-guide-summary {
    padding: 10px 14px;
    font-size: 0.84rem;
    font-weight: 600;
    cursor: pointer;
    display: flex;
    align-items: center;
    justify-content: space-between;
    color: var(--text-main, #18181b);
    user-select: none;
}

.offline-guide-summary:hover {
    background: var(--color-bg-hover, #f4f4f5);
}

.offline-guide-content {
    padding: 10px 14px 14px;
    font-size: 0.8rem;
    line-height: 1.5;
    color: var(--text-muted, #71717a);
    border-top: 1px solid var(--color-border-subtle, #f4f4f5);
}

.offline-guide-content code {
    background: var(--color-bg-hover, #f4f4f5);
    padding: 2px 6px;
    border-radius: 4px;
    font-size: 0.85em;
    font-family: ui-monospace, SFMono-Regular, monospace;
    color: var(--color-primary, #e53935);
}

.offline-guide-content strong {
    color: var(--text-main, #18181b);
}

/* Responsive adjustments */
@media (max-width: 640px) {
    .offline-manager-modal {
        width: 100% !important;
        max-width: 100% !important;
        margin: auto 0 0 0 !important;
        border-radius: 20px 20px 0 0 !important;
    }
    .offline-modal-card {
        padding: 16px;
        gap: 14px;
        max-height: calc(100dvh - 20px) !important;
        padding-bottom: max(20px, env(safe-area-inset-bottom, 0px)) !important;
        border-radius: 20px 20px 0 0 !important;
    }
    .offline-status-grid {
        grid-template-columns: repeat(2, 1fr);
        gap: 8px;
    }
    .offline-modal-actions {
        flex-direction: column;
    }
    .offline-btn-primary, .offline-btn-secondary {
        width: 100%;
        min-height: 46px;
    }
}