* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

:root {
    --bg-primary: #0a0a0a;
    --bg-secondary: #1a1a1a;
    --bg-tertiary: #1e1e1e;
    --bg-card: #252525;
    --accent-primary: #6366f1;
    --accent-secondary: #8b5cf6;
    --accent-gradient: linear-gradient(135deg, #6366f1 0%, #8b5cf6 100%);
    --text-primary: #ffffff;
    --text-secondary: #a0a0a0;
    --text-muted: #6b6b6b;
    --border-color: #333333;
    --success: #10b981;
    --error: #ef4444;
    --warning: #f59e0b;
}

body {
    font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, 'Helvetica Neue', Arial, sans-serif;
    background: var(--bg-primary);
    color: var(--text-primary);
    line-height: 1.6;
    min-height: 100vh;
    background-image: 
        radial-gradient(at 0% 0%, rgba(99, 102, 241, 0.1) 0px, transparent 50%),
        radial-gradient(at 100% 100%, rgba(139, 92, 246, 0.1) 0px, transparent 50%);
}

.container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 2rem;
    min-height: 100vh;
    display: flex;
    flex-direction: column;
}

header {
    text-align: center;
    margin-bottom: 3rem;
    padding: 2rem 0;
}

header h1 {
    font-size: 3rem;
    font-weight: 700;
    background: var(--accent-gradient);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
    margin-bottom: 0.5rem;
}

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

main {
    flex: 1;
}

.input-section {
    background: var(--bg-card);
    border-radius: 16px;
    padding: 2rem;
    margin-bottom: 2rem;
    border: 1px solid var(--border-color);
    box-shadow: 0 8px 32px rgba(0, 0, 0, 0.3);
}

.tabs {
    display: flex;
    gap: 1rem;
    margin-bottom: 2rem;
    border-bottom: 2px solid var(--border-color);
}

.tab-btn {
    background: none;
    border: none;
    color: var(--text-secondary);
    padding: 1rem 2rem;
    font-size: 1rem;
    cursor: pointer;
    border-bottom: 3px solid transparent;
    transition: all 0.3s ease;
    font-weight: 500;
}

.tab-btn:hover {
    color: var(--text-primary);
}

.tab-btn.active {
    color: var(--accent-primary);
    border-bottom-color: var(--accent-primary);
}

.tab-content {
    display: none;
}

.tab-content.active {
    display: block;
    animation: fadeIn 0.3s ease;
}

@keyframes fadeIn {
    from {
        opacity: 0;
        transform: translateY(10px);
    }
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

.input-group {
    display: flex;
    flex-direction: column;
    gap: 1rem;
}

label {
    color: var(--text-primary);
    font-weight: 500;
    font-size: 1rem;
}

textarea {
    width: 100%;
    padding: 1rem;
    background: var(--bg-secondary);
    border: 2px solid var(--border-color);
    border-radius: 8px;
    color: var(--text-primary);
    font-size: 1rem;
    font-family: inherit;
    resize: vertical;
    transition: border-color 0.3s ease;
}

textarea:focus {
    outline: none;
    border-color: var(--accent-primary);
}

.file-upload-area {
    border: 2px dashed var(--border-color);
    border-radius: 12px;
    padding: 3rem 2rem;
    text-align: center;
    cursor: pointer;
    transition: all 0.3s ease;
    background: var(--bg-secondary);
}

.file-upload-area:hover {
    border-color: var(--accent-primary);
    background: var(--bg-tertiary);
}

.file-upload-area.dragover {
    border-color: var(--accent-primary);
    background: var(--bg-tertiary);
    transform: scale(1.02);
}

.upload-icon {
    width: 48px;
    height: 48px;
    margin: 0 auto 1rem;
    color: var(--accent-primary);
}

.upload-text {
    font-size: 1.1rem;
    font-weight: 500;
    color: var(--text-primary);
    margin-bottom: 0.5rem;
}

.upload-subtext {
    font-size: 0.9rem;
    color: var(--text-secondary);
}

.file-info {
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: 1rem;
    background: var(--bg-secondary);
    border-radius: 8px;
    border: 2px solid var(--accent-primary);
}

.file-info span {
    color: var(--text-primary);
    font-weight: 500;
}

.remove-file {
    background: var(--error);
    border: none;
    color: white;
    width: 28px;
    height: 28px;
    border-radius: 50%;
    cursor: pointer;
    font-size: 1.2rem;
    display: flex;
    align-items: center;
    justify-content: center;
    transition: transform 0.2s ease;
}

.remove-file:hover {
    transform: scale(1.1);
}

.submit-btn {
    background: var(--accent-gradient);
    border: none;
    color: white;
    padding: 1rem 2rem;
    font-size: 1.1rem;
    font-weight: 600;
    border-radius: 8px;
    cursor: pointer;
    transition: all 0.3s ease;
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 0.5rem;
    margin-top: 1rem;
}

.submit-btn:hover:not(:disabled) {
    transform: translateY(-2px);
    box-shadow: 0 8px 24px rgba(99, 102, 241, 0.4);
}

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

.spinner {
    width: 20px;
    height: 20px;
    animation: spin 1s linear infinite;
}

.spinner.hidden {
    display: none;
}

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

.results-section {
    background: var(--bg-card);
    border-radius: 16px;
    padding: 2rem;
    border: 1px solid var(--border-color);
    box-shadow: 0 8px 32px rgba(0, 0, 0, 0.3);
    margin-bottom: 2rem;
}

.results-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 2rem;
    flex-wrap: wrap;
    gap: 1rem;
}

.results-header h2 {
    font-size: 1.8rem;
    background: var(--accent-gradient);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

.results-actions {
    display: flex;
    gap: 1rem;
    flex-wrap: wrap;
    position: relative;
}

.export-dropdown {
    position: relative;
}

.export-dropdown:hover .dropdown-menu,
.export-dropdown:focus-within .dropdown-menu {
    display: block;
}

.dropdown-menu {
    display: none;
    position: absolute;
    top: 100%;
    right: 0;
    margin-top: 0.5rem;
    background: var(--bg-card);
    border: 1px solid var(--border-color);
    border-radius: 8px;
    box-shadow: 0 8px 24px rgba(0, 0, 0, 0.4);
    z-index: 100;
    min-width: 200px;
    overflow: hidden;
}

.dropdown-item {
    display: block;
    width: 100%;
    padding: 0.75rem 1rem;
    background: none;
    border: none;
    color: var(--text-primary);
    text-align: left;
    cursor: pointer;
    transition: background 0.2s ease;
    font-size: 0.95rem;
}

.dropdown-item:hover {
    background: var(--bg-secondary);
}

.action-btn {
    background: var(--bg-secondary);
    border: 2px solid var(--accent-primary);
    color: var(--accent-primary);
    padding: 0.75rem 1.5rem;
    border-radius: 8px;
    cursor: pointer;
    font-weight: 500;
    transition: all 0.3s ease;
}

.action-btn:hover {
    background: var(--accent-primary);
    color: white;
    transform: translateY(-2px);
}

.summary-box, .slides-preview {
    background: var(--bg-secondary);
    border-radius: 12px;
    padding: 1.5rem;
    margin-bottom: 1.5rem;
    border: 1px solid var(--border-color);
}

.summary-box h3, .slides-preview h3 {
    color: var(--accent-primary);
    margin-bottom: 1rem;
    font-size: 1.3rem;
}

#summary-content, #slides-content {
    color: var(--text-secondary);
    line-height: 1.8;
    white-space: pre-wrap;
}

.error-message {
    background: rgba(239, 68, 68, 0.1);
    border: 2px solid var(--error);
    border-radius: 8px;
    padding: 1rem;
    color: var(--error);
    margin-bottom: 2rem;
}

.hidden {
    display: none !important;
}

footer {
    text-align: center;
    padding: 2rem 0;
    color: var(--text-muted);
    margin-top: auto;
}

/* Modal Styles */
.modal {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: rgba(0, 0, 0, 0.8);
    display: flex;
    align-items: center;
    justify-content: center;
    z-index: 1000;
    backdrop-filter: blur(4px);
}

.modal-content {
    background: var(--bg-card);
    border-radius: 16px;
    width: 90%;
    max-width: 900px;
    max-height: 90vh;
    display: flex;
    flex-direction: column;
    border: 1px solid var(--border-color);
    box-shadow: 0 20px 60px rgba(0, 0, 0, 0.5);
}

.modal-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 1.5rem 2rem;
    border-bottom: 1px solid var(--border-color);
}

.modal-header h2 {
    font-size: 1.5rem;
    background: var(--accent-gradient);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

.close-modal {
    background: none;
    border: none;
    color: var(--text-secondary);
    font-size: 2rem;
    cursor: pointer;
    width: 40px;
    height: 40px;
    display: flex;
    align-items: center;
    justify-content: center;
    border-radius: 50%;
    transition: all 0.3s ease;
}

.close-modal:hover {
    background: var(--bg-secondary);
    color: var(--text-primary);
}

.modal-body {
    padding: 2rem;
    overflow-y: auto;
    flex: 1;
}

.slide {
    display: none;
    animation: fadeIn 0.3s ease;
}

.slide.active {
    display: block;
}

.slide h2 {
    font-size: 2rem;
    margin-bottom: 1.5rem;
    color: var(--accent-primary);
}

.slide ul {
    list-style: none;
    padding-left: 0;
}

.slide li {
    padding: 0.75rem 0;
    padding-left: 2rem;
    position: relative;
    color: var(--text-secondary);
    font-size: 1.1rem;
}

.slide li::before {
    content: "▸";
    position: absolute;
    left: 0;
    color: var(--accent-primary);
    font-weight: bold;
}

.modal-footer {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 1.5rem 2rem;
    border-top: 1px solid var(--border-color);
    gap: 1rem;
    flex-wrap: wrap;
}

.modal-export {
    display: flex;
    gap: 0.5rem;
}

.edit-modal-content {
    max-width: 1000px;
}

.edit-slide-item {
    background: var(--bg-secondary);
    border-radius: 12px;
    padding: 1.5rem;
    margin-bottom: 1.5rem;
    border: 1px solid var(--border-color);
}

.edit-slide-item h3 {
    color: var(--accent-primary);
    margin-bottom: 1rem;
    font-size: 1.2rem;
}

.edit-slide-item input {
    width: 100%;
    padding: 0.75rem;
    background: var(--bg-tertiary);
    border: 2px solid var(--border-color);
    border-radius: 8px;
    color: var(--text-primary);
    font-size: 1rem;
    font-family: inherit;
    margin-bottom: 1rem;
}

.edit-slide-item input:focus {
    outline: none;
    border-color: var(--accent-primary);
}

.edit-slide-item textarea {
    width: 100%;
    padding: 0.75rem;
    background: var(--bg-tertiary);
    border: 2px solid var(--border-color);
    border-radius: 8px;
    color: var(--text-primary);
    font-size: 0.95rem;
    font-family: inherit;
    resize: vertical;
    min-height: 100px;
}

.edit-slide-item textarea:focus {
    outline: none;
    border-color: var(--accent-primary);
}

.edit-slide-item .point-item {
    display: flex;
    gap: 0.5rem;
    margin-bottom: 0.5rem;
    align-items: flex-start;
}

.edit-slide-item .point-item input {
    flex: 1;
    margin-bottom: 0;
}

.edit-slide-item .remove-point {
    background: var(--error);
    border: none;
    color: white;
    width: 32px;
    height: 32px;
    border-radius: 6px;
    cursor: pointer;
    display: flex;
    align-items: center;
    justify-content: center;
    flex-shrink: 0;
    transition: transform 0.2s ease;
}

.edit-slide-item .remove-point:hover {
    transform: scale(1.1);
}

.add-point-btn {
    background: var(--bg-tertiary);
    border: 2px dashed var(--accent-primary);
    color: var(--accent-primary);
    padding: 0.5rem 1rem;
    border-radius: 8px;
    cursor: pointer;
    font-size: 0.9rem;
    transition: all 0.2s ease;
    margin-top: 0.5rem;
}

.add-point-btn:hover {
    background: var(--accent-primary);
    color: white;
}

.save-btn {
    background: var(--accent-gradient) !important;
    color: white !important;
    border: none !important;
}

.nav-btn {
    background: var(--bg-secondary);
    border: 2px solid var(--accent-primary);
    color: var(--accent-primary);
    padding: 0.75rem 1.5rem;
    border-radius: 8px;
    cursor: pointer;
    font-weight: 500;
    transition: all 0.3s ease;
}

.nav-btn:hover:not(:disabled) {
    background: var(--accent-primary);
    color: white;
}

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

#slide-counter {
    color: var(--text-secondary);
    font-weight: 500;
}

/* Responsive Design */
@media (max-width: 768px) {
    .container {
        padding: 1rem;
    }

    header h1 {
        font-size: 2rem;
    }

    .input-section {
        padding: 1.5rem;
    }

    .results-header {
        flex-direction: column;
        align-items: flex-start;
    }

    .modal-content {
        width: 95%;
        max-height: 95vh;
    }

    .modal-body {
        padding: 1.5rem;
    }
}