/* ==============================================================
   PPT EXPORT STYLES — Enhanced for sophistication & simplicity
   ============================================================== */

/* --- Reset & base --- */
.ppt-main {
    padding: 1.5rem 1rem 2rem;
    min-height: calc(100vh - 140px);
    background: var(--bg-page);
}
.ppt-main .container {
    max-width: 1000px;
    margin: 0 auto;
}

/* --- Header --- */
.ppt-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 2rem;
    flex-wrap: wrap;
    gap: 1rem;
}
.ppt-header h1 {
    font-size: 1.8rem;
    font-weight: 600;
    display: flex;
    align-items: center;
    gap: 0.5rem;
}
.ppt-header h1 i {
    color: var(--accent);
}
.ppt-header .back-btn {
    background: var(--surface);
    border: 1px solid var(--border-light);
    padding: 0.5rem 1.2rem;
    border-radius: 2rem;
    color: var(--text-primary);
    text-decoration: none;
    transition: all var(--transition);
    font-weight: 500;
    display: flex;
    align-items: center;
    gap: 0.5rem;
}
.ppt-header .back-btn:hover {
    border-color: var(--accent);
    color: var(--accent);
    transform: translateY(-2px);
    box-shadow: var(--shadow-sm);
}

/* --- Steps indicator (simplified) --- */
.steps-indicator {
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 0;
    margin-bottom: 2rem;
    padding: 0.5rem 1.5rem;
    background: var(--surface);
    border-radius: 3rem;
    border: 1px solid var(--border-light);
    box-shadow: var(--shadow-sm);
    overflow-x: auto;
    -webkit-overflow-scrolling: touch;
    scrollbar-width: none;
    -ms-overflow-style: none;
}
.steps-indicator::-webkit-scrollbar {
    display: none;
}
.step-item {
    display: flex;
    align-items: center;
    gap: 0.5rem;
    padding: 0.4rem 0.8rem;
    border-radius: 2rem;
    cursor: pointer;
    transition: all var(--transition);
    flex-shrink: 0;
    opacity: 0.5;
}
.step-item.active {
    opacity: 1;
}
.step-item.active .step-circle {
    background: var(--accent);
    color: #fff;
    border-color: var(--accent);
    box-shadow: 0 4px 12px rgba(0, 150, 136, 0.3);
}
.step-circle {
    display: flex;
    align-items: center;
    justify-content: center;
    width: 36px;
    height: 36px;
    border-radius: 50%;
    background: var(--border-light);
    color: var(--text-secondary);
    border: 2px solid transparent;
    transition: all var(--transition);
    position: relative;
}
.step-num {
    font-size: 0.7rem;
    font-weight: 700;
    display: block;
}
.step-icon {
    display: none;
    font-size: 0.9rem;
}
.step-item.active .step-num {
    display: none;
}
.step-item.active .step-icon {
    display: block;
}
.step-label {
    font-size: 0.8rem;
    font-weight: 600;
    color: var(--text-secondary);
    white-space: nowrap;
}
.step-item.active .step-label {
    color: var(--text-primary);
}
.step-line {
    width: 24px;
    height: 2px;
    background: var(--border-light);
    flex-shrink: 0;
}
.step-item.completed .step-circle {
    background: var(--accent);
    color: #fff;
    border-color: var(--accent);
}

/* --- Cards --- */
.ppt-card {
    background: var(--card-bg);
    backdrop-filter: blur(8px);
    -webkit-backdrop-filter: blur(8px);
    border: 1px solid var(--border-light);
    border-radius: var(--radius);
    padding: 2rem;
    margin-bottom: 1.5rem;
    box-shadow: var(--shadow-sm);
    transition: box-shadow var(--transition);
    animation: fadeSlideUp 0.4s ease forwards;
    opacity: 0;
}
.ppt-card:hover {
    box-shadow: var(--shadow-hover);
}
.ppt-card:nth-child(1) {
    animation-delay: 0.05s;
}
.ppt-card:nth-child(2) {
    animation-delay: 0.1s;
}
.ppt-card:nth-child(3) {
    animation-delay: 0.15s;
}
@keyframes fadeSlideUp {
    from {
        opacity: 0;
        transform: translateY(20px);
    }
    to {
        opacity: 1;
        transform: translateY(0);
    }
}
.ppt-card h2 {
    font-size: 1.4rem;
    font-weight: 600;
    margin-bottom: 0.5rem;
    display: flex;
    align-items: center;
    gap: 0.5rem;
}
.ppt-card h2 i {
    color: var(--accent);
}
.ppt-card .sub {
    color: var(--text-secondary);
    margin-bottom: 1.5rem;
    font-size: 0.95rem;
}

/* --- Theme Carousel --- */
.theme-carousel-wrapper {
    position: relative;
    overflow: hidden;
}
.theme-carousel {
    display: flex;
    gap: 1rem;
    overflow-x: auto;
    padding: 0.5rem 0.25rem 1rem;
    scroll-behavior: smooth;
    -webkit-overflow-scrolling: touch;
    scrollbar-width: none;
    -ms-overflow-style: none;
}
.theme-carousel::-webkit-scrollbar {
    display: none;
}
.theme-option {
    flex: 0 0 200px;
    min-width: 180px;
    background: var(--surface);
    border: 2px solid var(--border-light);
    border-radius: 1.2rem;
    padding: 1.2rem;
    cursor: pointer;
    transition: all var(--transition);
    text-align: center;
    position: relative;
}
.theme-option:hover {
    border-color: var(--accent);
    transform: translateY(-4px);
    box-shadow: 0 8px 24px rgba(0, 150, 136, 0.12);
}
.theme-option.selected {
    border-color: var(--accent);
    background: var(--accent-soft);
    box-shadow: 0 0 0 4px var(--accent-soft);
}
.theme-option .theme-preview {
    width: 100%;
    height: 80px;
    border-radius: 0.75rem;
    margin-bottom: 0.75rem;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 0.85rem;
    font-weight: 600;
    color: #fff;
    gap: 0.5rem;
}
.theme-option .theme-preview .dot {
    width: 18px;
    height: 18px;
    border-radius: 50%;
    display: inline-block;
    border: 1px solid rgba(255, 255, 255, 0.3);
}
.theme-option .theme-name {
    font-weight: 600;
    font-size: 0.95rem;
}
.theme-option .theme-desc {
    font-size: 0.8rem;
    color: var(--text-secondary);
    margin-top: 0.2rem;
}
.theme-option .check-mark {
    position: absolute;
    top: 8px;
    right: 8px;
    background: var(--accent);
    color: #fff;
    width: 28px;
    height: 28px;
    border-radius: 50%;
    display: none;
    align-items: center;
    justify-content: center;
    font-size: 0.8rem;
    box-shadow: 0 2px 8px rgba(0, 150, 136, 0.3);
}
.theme-option.selected .check-mark {
    display: flex;
}

.carousel-nav {
    position: absolute;
    top: 50%;
    transform: translateY(-50%);
    background: var(--surface);
    border: 1px solid var(--border-light);
    border-radius: 50%;
    width: 40px;
    height: 40px;
    display: flex;
    align-items: center;
    justify-content: center;
    cursor: pointer;
    transition: all var(--transition);
    color: var(--text-primary);
    box-shadow: var(--shadow-sm);
    z-index: 2;
}
.carousel-nav:hover {
    background: var(--accent);
    color: #fff;
    border-color: var(--accent);
}
.carousel-prev {
    left: -12px;
}
.carousel-next {
    right: -12px;
}
@media (max-width: 768px) {
    .carousel-nav {
        display: none;
    }
}

/* --- Style options (simplified) --- */
.style-options {
    display: flex;
    gap: 0.75rem;
    flex-wrap: wrap;
}
.style-option {
    display: flex;
    align-items: center;
    gap: 0.5rem;
    padding: 0.5rem 1.2rem;
    background: var(--surface);
    border: 1px solid var(--border-light);
    border-radius: 2rem;
    cursor: pointer;
    transition: all var(--transition);
    font-weight: 500;
    font-size: 0.9rem;
    user-select: none;
    min-height: 44px;
}
.style-option:hover {
    border-color: var(--accent);
    transform: translateY(-2px);
}
.style-option.selected {
    border-color: var(--accent);
    background: var(--accent-soft);
    color: var(--accent);
    box-shadow: 0 0 0 3px var(--accent-soft);
}
.style-option input[type="radio"] {
    accent-color: var(--accent);
    width: 18px;
    height: 18px;
    cursor: pointer;
    margin: 0;
}

/* --- Additional instructions --- */
.additional-textarea {
    width: 100%;
    padding: 0.8rem 1rem;
    border: 1px solid var(--border-light);
    border-radius: 1rem;
    background: var(--surface);
    color: var(--text-primary);
    font-family: inherit;
    font-size: 0.95rem;
    resize: vertical;
    min-height: 70px;
    transition: border-color var(--transition);
}
.additional-textarea:focus {
    outline: none;
    border-color: var(--accent);
    box-shadow: 0 0 0 3px var(--accent-soft);
}

/* --- Slide count badge --- */
.slide-count-badge {
    display: inline-flex;
    align-items: center;
    gap: 0.5rem;
    padding: 0.4rem 1rem;
    background: var(--accent-soft);
    border-radius: 2rem;
    font-size: 0.9rem;
    font-weight: 600;
    color: var(--accent);
}
.slide-count-badge i {
    font-size: 1rem;
}

/* --- Generate button --- */
.generate-ppt-btn {
    width: 100%;
    padding: 1rem;
    background: linear-gradient(135deg, var(--accent), #0d9488);
    color: white;
    border: none;
    border-radius: 3rem;
    font-size: 1.1rem;
    font-weight: 600;
    cursor: pointer;
    transition: all var(--transition);
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 0.75rem;
    margin-top: 0.5rem;
    font-family: inherit;
    box-shadow: 0 4px 16px rgba(0, 150, 136, 0.3);
    min-height: 56px;
}
.generate-ppt-btn:hover {
    transform: translateY(-3px);
    box-shadow: 0 8px 30px rgba(0, 150, 136, 0.4);
    filter: brightness(1.05);
}
.generate-ppt-btn:active {
    transform: scale(0.98);
}
.generate-ppt-btn:disabled {
    opacity: 0.5;
    cursor: not-allowed;
    transform: none !important;
}
.generate-ppt-btn .fa-spinner {
    animation: spin 1s linear infinite;
}
@keyframes spin {
    to {
        transform: rotate(360deg);
    }
}

/* --- Generation status --- */
#generationStatus {
    margin-top: 0.8rem;
    padding: 0.8rem;
    border-radius: 1rem;
    background: var(--surface);
    border: 1px solid var(--border-light);
    text-align: center;
    font-size: 0.9rem;
    color: var(--text-secondary);
    display: none;
    transition: all 0.3s ease;
}
#generationStatus .fa-spinner {
    animation: spin 1s linear infinite;
}
#generationStatus.success {
    border-color: var(--accent);
    background: var(--accent-soft);
    color: var(--accent);
}
#generationStatus.error {
    border-color: #dc2626;
    background: rgba(220, 38, 38, 0.1);
    color: #dc2626;
}

/* --- Toast --- */
#toast-container {
    position: fixed;
    bottom: 20px;
    right: 20px;
    z-index: 9999;
    display: flex;
    flex-direction: column;
    gap: 0.5rem;
}
.toast {
    background: var(--surface);
    border-left: 4px solid var(--accent);
    padding: 12px 20px;
    border-radius: 12px;
    box-shadow: 0 8px 24px rgba(0, 0, 0, 0.15);
    display: flex;
    align-items: center;
    gap: 10px;
    animation: slideUp 0.3s ease;
    color: var(--text-primary);
    max-width: 400px;
}
.toast.error {
    border-left-color: #dc2626;
}
.toast.warning {
    border-left-color: #f59e0b;
}
@keyframes slideUp {
    from {
        opacity: 0;
        transform: translateY(20px);
    }
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

/* --- Preview Modal (enhanced) --- */
.ppt-preview-overlay {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background: rgba(0, 0, 0, 0.6);
    backdrop-filter: blur(8px);
    z-index: 10000;
    display: flex;
    align-items: center;
    justify-content: center;
    padding: 1.5rem;
    animation: fadeIn 0.3s ease;
}
.ppt-preview-modal {
    background: var(--surface);
    border-radius: 1.5rem;
    max-width: 1000px;
    width: 100%;
    max-height: 90vh;
    display: flex;
    flex-direction: column;
    box-shadow: 0 25px 60px rgba(0, 0, 0, 0.3);
    overflow: hidden;
}
.ppt-preview-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 1.2rem 1.5rem;
    border-bottom: 1px solid var(--border-light);
    background: var(--surface);
}
.ppt-preview-header h3 {
    margin: 0;
    font-size: 1.2rem;
    display: flex;
    align-items: center;
    gap: 0.5rem;
}
.ppt-preview-close {
    background: transparent;
    border: none;
    font-size: 1.8rem;
    cursor: pointer;
    color: var(--text-secondary);
    padding: 0 0.5rem;
    transition: all 0.2s;
}
.ppt-preview-close:hover {
    color: var(--text-primary);
    transform: rotate(90deg);
}
.ppt-preview-body {
    flex: 1;
    overflow-y: auto;
    padding: 1.5rem;
    background: var(--bg-page);
}
.preview-slide {
    background: var(--surface);
    border-radius: 0.8rem;
    padding: 1.5rem;
    margin-bottom: 1.2rem;
    box-shadow: 0 2px 12px rgba(0, 0, 0, 0.06);
    border: 1px solid var(--border-light);
    position: relative;
}
.preview-slide h4 {
    font-size: 1.3rem;
    margin: 0 0 0.3rem 0;
    display: flex;
    align-items: center;
    gap: 0.5rem;
}
.preview-layout-badge {
    font-size: 0.6rem;
    padding: 0.15rem 0.6rem;
    border-radius: 12px;
    background: var(--accent);
    color: white;
    display: inline-block;
    margin-left: 0.5rem;
    text-transform: uppercase;
    letter-spacing: 0.5px;
    font-weight: 600;
}
.preview-chart {
    background: var(--accent-soft);
    padding: 0.8rem 1.2rem;
    border-radius: 8px;
    margin: 0.5rem 0;
    display: flex;
    align-items: center;
    gap: 0.8rem;
    border-left: 3px solid var(--accent);
}
.preview-chart i {
    font-size: 1.5rem;
    color: var(--accent);
}
.preview-chart .chart-type {
    font-weight: 600;
    text-transform: uppercase;
    font-size: 0.7rem;
    letter-spacing: 0.5px;
    color: var(--text-secondary);
}
.preview-notes {
    margin-top: 0.8rem;
    padding: 0.6rem 1rem;
    background: var(--bg-page);
    border-radius: 6px;
    font-size: 0.8rem;
    color: var(--text-secondary);
    border-left: 3px solid var(--border-light);
}
.preview-notes i {
    margin-right: 0.5rem;
    color: var(--accent);
}
.preview-comparison {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 1rem;
    margin: 0.5rem 0;
}
.preview-comparison .col {
    padding: 0.8rem;
    border-radius: 6px;
    background: var(--bg-page);
    border: 1px solid var(--border-light);
}
.preview-comparison .col h5 {
    margin: 0 0 0.3rem 0;
    font-size: 0.9rem;
    color: var(--accent);
}
.preview-timeline {
    display: flex;
    gap: 0.5rem;
    margin: 0.5rem 0;
    padding: 0.5rem 0;
    overflow-x: auto;
}
.preview-timeline .item {
    flex: 1;
    min-width: 80px;
    padding: 0.5rem;
    background: var(--bg-page);
    border-radius: 6px;
    text-align: center;
    font-size: 0.8rem;
    border-top: 3px solid var(--accent);
    position: relative;
}
.preview-timeline .item .time {
    font-weight: 600;
    color: var(--accent);
    display: block;
    margin-bottom: 0.2rem;
}
.ppt-preview-footer {
    display: flex;
    justify-content: flex-end;
    gap: 0.8rem;
    padding: 1rem 1.5rem;
    border-top: 1px solid var(--border-light);
    background: var(--surface);
}
.ppt-preview-btn {
    padding: 0.6rem 1.5rem;
    border-radius: 2rem;
    font-weight: 600;
    font-size: 0.9rem;
    cursor: pointer;
    transition: all 0.2s;
    border: none;
    font-family: inherit;
}
.ppt-preview-btn.primary {
    background: var(--accent);
    color: #fff;
    box-shadow: 0 4px 12px rgba(0, 150, 136, 0.3);
}
.ppt-preview-btn.primary:hover {
    transform: translateY(-2px);
    box-shadow: 0 6px 20px rgba(0, 150, 136, 0.4);
}
.ppt-preview-btn.secondary {
    background: transparent;
    border: 1px solid var(--border-light);
    color: var(--text-primary);
}
.ppt-preview-btn.secondary:hover {
    background: var(--border-light);
}

@keyframes fadeIn {
    from {
        opacity: 0;
    }
    to {
        opacity: 1;
    }
}

/* --- Responsive --- */
@media (max-width: 768px) {
    .ppt-main {
        padding: 1rem 0.75rem;
    }
    .ppt-card {
        padding: 1.2rem;
    }
    .theme-option {
        flex: 0 0 160px;
        min-width: 140px;
    }
    .ppt-header h1 {
        font-size: 1.4rem;
    }
    .ppt-header .back-btn span {
        display: none;
    }
    .steps-indicator {
        padding: 0.3rem 0.8rem;
    }
    .step-item {
        padding: 0.3rem 0.5rem;
    }
    .step-circle {
        width: 30px;
        height: 30px;
    }
    .step-label {
        font-size: 0.7rem;
    }
    .step-line {
        width: 16px;
    }
    .ppt-preview-overlay {
        padding: 0.5rem;
    }
    .ppt-preview-modal {
        max-height: 95vh;
        border-radius: 1rem;
    }
    .ppt-preview-body {
        padding: 1rem;
    }
    .preview-slide {
        padding: 1rem;
    }
    .preview-comparison {
        grid-template-columns: 1fr;
    }
    .preview-timeline .item {
        min-width: 60px;
    }
    .ppt-preview-footer {
        flex-wrap: wrap;
        justify-content: stretch;
    }
    .ppt-preview-btn {
        flex: 1;
        text-align: center;
        padding: 0.6rem 1rem;
    }
}
@media (max-width: 480px) {
    .steps-indicator {
        justify-content: flex-start;
        padding: 0.3rem 0.8rem;
    }
    .step-item {
        padding: 0.2rem 0.4rem;
    }
    .step-circle {
        width: 26px;
        height: 26px;
    }
    .step-label {
        display: none;
    }
    .step-line {
        width: 12px;
    }
    .style-options {
        flex-direction: column;
        width: 100%;
    }
    .style-option {
        width: 100%;
        justify-content: center;
    }
    .theme-option {
        flex: 0 0 70%;
        min-width: 75%;
    }
    .generate-ppt-btn {
        font-size: 1rem;
        padding: 0.8rem;
    }
    .ppt-card {
        padding: 1rem;
        border-radius: 1.2rem;
    }
}

/* --- Dark mode --- */
[data-theme="dark"] .ppt-card {
    background: rgba(30, 42, 50, 0.7);
}
[data-theme="dark"] .theme-option {
    background: #2e3b45;
    border-color: #3e4b55;
}
[data-theme="dark"] .theme-option:hover {
    border-color: var(--accent);
}
[data-theme="dark"] .theme-option.selected {
    border-color: var(--accent);
    background: rgba(20, 184, 166, 0.2);
}
[data-theme="dark"] .style-option {
    background: #2e3b45;
    border-color: #3e4b55;
}
[data-theme="dark"] .style-option.selected {
    background: rgba(20, 184, 166, 0.2);
    border-color: var(--accent);
}
[data-theme="dark"] .steps-indicator {
    background: #2e3b45;
    border-color: #3e4b55;
}
[data-theme="dark"] .step-item.active .step-circle {
    background: var(--accent);
}
[data-theme="dark"] .step-circle {
    background: #3e4b55;
    color: var(--text-secondary);
}
[data-theme="dark"] .generate-ppt-btn {
    background: linear-gradient(135deg, #14b8a6, #0d9488);
}
[data-theme="dark"] .carousel-nav {
    background: #2e3b45;
    border-color: #3e4b55;
}
[data-theme="dark"] .carousel-nav:hover {
    background: var(--accent);
}
[data-theme="dark"] #generationStatus {
    background: #2e3b45;
    border-color: #3e4b55;
}
[data-theme="dark"] #generationStatus.success {
    background: rgba(20, 184, 166, 0.1);
    border-color: var(--accent);
}
[data-theme="dark"] #generationStatus.error {
    background: rgba(220, 38, 38, 0.1);
    border-color: #dc2626;
}
[data-theme="dark"] .preview-chart {
    background: rgba(20, 184, 166, 0.1);
}
[data-theme="dark"] .preview-notes {
    background: #2e3b45;
}
[data-theme="dark"] .preview-comparison .col {
    background: #2e3b45;
}
[data-theme="dark"] .preview-timeline .item {
    background: #2e3b45;
}
[data-theme="dark"] .additional-textarea {
    background: #2e3b45;
    border-color: #3e4b55;
    color: var(--text-primary);
}