/* Modern CSS Reset and Variables */
:root {
    /* Typography */
    --font-family: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, Helvetica, Arial, sans-serif;
    --font-weight-light: 300;
    --font-weight-normal: 400;
    --font-weight-medium: 500;
    --font-weight-semibold: 600;
    --font-weight-bold: 700;

    /* Spacing Scale */
    --space-xs: 0.25rem;
    --space-sm: 0.5rem;
    --space-md: 1rem;
    --space-lg: 1.5rem;
    --space-xl: 2rem;
    --space-2xl: 3rem;
    --space-3xl: 4rem;

    /* Border Radius */
    --radius-sm: 6px;
    --radius-md: 12px;
    --radius-lg: 16px;
    --radius-xl: 24px;

    /* Shadows */
    --shadow-sm: 0 1px 3px rgba(0, 0, 0, 0.05);
    --shadow-md: 0 4px 12px rgba(0, 0, 0, 0.08);
    --shadow-lg: 0 8px 32px rgba(0, 0, 0, 0.12);
    --shadow-xl: 0 20px 40px rgba(0, 0, 0, 0.15);

    /* Transitions */
    --transition-fast: 0.15s cubic-bezier(0.4, 0, 0.2, 1);
    --transition-normal: 0.3s cubic-bezier(0.4, 0, 0.2, 1);
    --transition-slow: 0.5s cubic-bezier(0.4, 0, 0.2, 1);
}

/* Light Theme Colors (Default) */
:root, [data-theme="light"] {
    --color-bg-primary: #ffffff;
    --color-bg-secondary: #f8fafc;
    --color-bg-tertiary: #f1f5f9;
    --color-bg-accent: #e2e8f0;

    --color-text-primary: #0f172a;
    --color-text-secondary: #475569;
    --color-text-tertiary: #64748b;
    --color-text-inverse: #ffffff;

    --color-border-primary: #e2e8f0;
    --color-border-secondary: #cbd5e1;
    --color-border-accent: #94a3b8;

    --color-brand-primary: #3b82f6;
    --color-brand-secondary: #1d4ed8;
    --color-brand-tertiary: #dbeafe;

    --color-success: #10b981;
    --color-warning: #f59e0b;
    --color-error: #ef4444;
    --color-info: #06b6d4;

    /* Gradients */
    --gradient-brand: linear-gradient(135deg, #3b82f6, #8b5cf6);
    --gradient-accent: linear-gradient(135deg, #06b6d4, #3b82f6);
}

/* Dark Theme Colors */
[data-theme="dark"] {
    --color-bg-primary: #0f172a;
    --color-bg-secondary: #1e293b;
    --color-bg-tertiary: #334155;
    --color-bg-accent: #475569;

    --color-text-primary: #f8fafc;
    --color-text-secondary: #cbd5e1;
    --color-text-tertiary: #94a3b8;
    --color-text-inverse: #0f172a;

    --color-border-primary: #334155;
    --color-border-secondary: #475569;
    --color-border-accent: #64748b;

    --color-brand-primary: #60a5fa;
    --color-brand-secondary: #3b82f6;
    --color-brand-tertiary: #1e3a8a;

    --color-success: #34d399;
    --color-warning: #fbbf24;
    --color-error: #f87171;
    --color-info: #22d3ee;

    /* Gradients */
    --gradient-brand: linear-gradient(135deg, #60a5fa, #a78bfa);
    --gradient-accent: linear-gradient(135deg, #22d3ee, #60a5fa);
}

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

html {
    font-size: 16px;
    line-height: 1.5;
    scroll-behavior: smooth;
}

body {
    font-family: var(--font-family);
    font-weight: var(--font-weight-normal);
    color: var(--color-text-primary);
    background-color: var(--color-bg-secondary);
    line-height: 1.6;
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
    transition: background-color var(--transition-normal), color var(--transition-normal);
}

/* Layout */
.app-container {
    min-height: 100vh;
    display: flex;
    flex-direction: column;
    max-width: 1400px;
    margin: 0 auto;
    padding: 0 var(--space-lg);
}

/* Header */
.header {
    padding: var(--space-2xl) 0 var(--space-xl);
}

.header-content {
    display: flex;
    justify-content: space-between;
    align-items: flex-start;
    gap: var(--space-xl);
}

.header-left {
    flex: 1;
}

.header-title {
    font-size: clamp(2.5rem, 5vw, 3.5rem);
    font-weight: var(--font-weight-bold);
    line-height: 1.1;
    margin-bottom: var(--space-md);
    color: var(--color-text-primary);
}

.gradient-text {
    background: var(--gradient-brand);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

.header-subtitle {
    font-size: 1.125rem;
    color: var(--color-text-secondary);
    max-width: 600px;
    line-height: 1.6;
}

.theme-toggle {
    display: flex;
    align-items: center;
    justify-content: center;
    width: 48px;
    height: 48px;
    border: none;
    background: var(--color-bg-primary);
    border-radius: var(--radius-md);
    cursor: pointer;
    color: var(--color-text-secondary);
    box-shadow: var(--shadow-sm);
    border: 1px solid var(--color-border-primary);
    transition: all var(--transition-fast);
}

.theme-toggle:hover {
    background: var(--color-bg-tertiary);
    transform: translateY(-1px);
    box-shadow: var(--shadow-md);
}

/* Main Content */
.main-content {
    flex: 1;
    padding-bottom: var(--space-3xl);
}

/* Input Section */
.input-section {
    margin-bottom: var(--space-3xl);
}

.input-card {
    background: var(--color-bg-primary);
    border-radius: var(--radius-xl);
    box-shadow: var(--shadow-lg);
    border: 1px solid var(--color-border-primary);
    overflow: hidden;
    transition: all var(--transition-normal);
}

.input-card:hover {
    box-shadow: var(--shadow-xl);
}

/* Input Area */
.input-area {
    padding: var(--space-xl);
}

.input-container {
    position: relative;
    margin-bottom: var(--space-lg);
}

.transcript-input {
    width: 100%;
    min-height: 200px;
    padding: var(--space-lg);
    border: 2px solid var(--color-border-primary);
    border-radius: var(--radius-lg);
    font-family: var(--font-family);
    font-size: 1rem;
    line-height: 1.6;
    color: var(--color-text-primary);
    background: var(--color-bg-secondary);
    resize: vertical;
    transition: all var(--transition-fast);
}

.transcript-input:focus {
    outline: none;
    border-color: var(--color-brand-primary);
    background: var(--color-bg-primary);
    box-shadow: 0 0 0 3px rgba(59, 130, 246, 0.1);
}

.transcript-input::placeholder {
    color: var(--color-text-tertiary);
}

/* Upload Overlay */
.upload-overlay {
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background: rgba(59, 130, 246, 0.02);
    border: 2px dashed var(--color-border-secondary);
    border-radius: var(--radius-lg);
    display: none;
    align-items: center;
    justify-content: center;
    backdrop-filter: blur(4px);
    transition: all var(--transition-fast);
}

.upload-overlay.dragover {
    display: flex;
    background: rgba(59, 130, 246, 0.08);
    border-color: var(--color-brand-primary);
}

.upload-content {
    text-align: center;
    padding: var(--space-xl);
}

.upload-icon {
    font-size: 3rem;
    margin-bottom: var(--space-md);
}

.upload-content p {
    font-size: 1.125rem;
    font-weight: var(--font-weight-medium);
    color: var(--color-text-primary);
    margin-bottom: var(--space-sm);
}

.upload-hint {
    display: block;
    font-size: 0.875rem;
    color: var(--color-text-tertiary);
    margin: var(--space-sm) 0;
}

.file-select-btn {
    background: var(--color-brand-primary);
    color: var(--color-text-inverse);
    border: none;
    padding: var(--space-sm) var(--space-lg);
    border-radius: var(--radius-md);
    font-weight: var(--font-weight-medium);
    cursor: pointer;
    transition: all var(--transition-fast);
}

.file-select-btn:hover {
    background: var(--color-brand-secondary);
    transform: translateY(-1px);
}

/* File Info */
.file-info {
    padding: var(--space-md);
    background: var(--color-bg-tertiary);
    border-radius: var(--radius-md);
    border: 1px solid var(--color-border-primary);
}

.file-info-content {
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.file-name {
    font-weight: var(--font-weight-medium);
    color: var(--color-text-primary);
}

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

/* Advanced Options */
.advanced-options {
    padding: 0 var(--space-xl) var(--space-lg);
    animation: fadeInDown var(--transition-normal) ease-out;
}

@keyframes fadeInDown {
    from {
        opacity: 0;
        transform: translateY(-20px);
    }
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

.options-grid {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: var(--space-lg);
}

.form-group {
    display: flex;
    flex-direction: column;
    gap: var(--space-sm);
}

.form-group label {
    font-weight: var(--font-weight-medium);
    color: var(--color-text-primary);
    font-size: 0.875rem;
}

.form-input, .form-select {
    padding: var(--space-md);
    border: 1px solid var(--color-border-primary);
    border-radius: var(--radius-md);
    font-family: var(--font-family);
    font-size: 0.875rem;
    color: var(--color-text-primary);
    background: var(--color-bg-secondary);
    transition: all var(--transition-fast);
}

.form-input:focus, .form-select:focus {
    outline: none;
    border-color: var(--color-brand-primary);
    background: var(--color-bg-primary);
    box-shadow: 0 0 0 3px rgba(59, 130, 246, 0.1);
}

/* Input Footer */
.input-footer {
    padding: var(--space-lg) var(--space-xl) var(--space-xl);
    background: var(--color-bg-secondary);
    border-top: 1px solid var(--color-border-primary);
}

.process-btn {
    width: 100%;
    display: flex;
    align-items: center;
    justify-content: center;
    gap: var(--space-sm);
    padding: var(--space-lg) var(--space-xl);
    background: var(--gradient-brand);
    color: var(--color-text-inverse);
    border: none;
    border-radius: var(--radius-lg);
    font-size: 1.125rem;
    font-weight: var(--font-weight-semibold);
    cursor: pointer;
    transition: all var(--transition-fast);
    box-shadow: var(--shadow-md);
}

.process-btn:hover:not(:disabled) {
    transform: translateY(-2px);
    box-shadow: var(--shadow-lg);
}

.process-btn:disabled {
    opacity: 0.7;
    cursor: not-allowed;
}

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

/* Results Section */
.results-section {
    animation: fadeIn var(--transition-slow) ease-out;
}

@keyframes fadeIn {
    from { opacity: 0; transform: translateY(20px); }
    to { opacity: 1; transform: translateY(0); }
}

/* Loading State */
.loading-state {
    text-align: center;
    padding: var(--space-3xl);
    background: var(--color-bg-primary);
    border-radius: var(--radius-xl);
    box-shadow: var(--shadow-lg);
}

.spinner {
    width: 48px;
    height: 48px;
    border: 3px solid var(--color-border-primary);
    border-top-color: var(--color-brand-primary);
    border-radius: 50%;
    animation: spin 1s linear infinite;
    margin: 0 auto var(--space-lg);
}

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

.loading-text {
    font-size: 1.125rem;
    font-weight: var(--font-weight-medium);
    color: var(--color-text-secondary);
}

/* Error State */
.error-state {
    padding: var(--space-xl);
    background: var(--color-bg-primary);
    border: 1px solid var(--color-error);
    border-radius: var(--radius-lg);
    color: var(--color-error);
    text-align: center;
    font-weight: var(--font-weight-medium);
}

/* Bento Grid Layout */
.bento-grid {
    display: grid;
    grid-template-columns: repeat(12, 1fr);
    gap: var(--space-lg);
    margin-bottom: var(--space-xl);
}

.bento-card {
    background: var(--color-bg-primary);
    border: 1px solid var(--color-border-primary);
    border-radius: var(--radius-lg);
    padding: var(--space-xl);
    box-shadow: var(--shadow-md);
    transition: all var(--transition-normal);
    animation: slideInUp var(--transition-slow) ease-out both;
}

.bento-card:hover {
    transform: translateY(-4px);
    box-shadow: var(--shadow-lg);
}

.bento-card.large {
    grid-column: span 8;
}

.bento-card.medium {
    grid-column: span 6;
}

.bento-card.small {
    grid-column: span 4;
}

/* Card animations with stagger */
.bento-card:nth-child(1) { animation-delay: 0.1s; }
.bento-card:nth-child(2) { animation-delay: 0.2s; }
.bento-card:nth-child(3) { animation-delay: 0.3s; }
.bento-card:nth-child(4) { animation-delay: 0.4s; }
.bento-card:nth-child(5) { animation-delay: 0.5s; }
.bento-card:nth-child(6) { animation-delay: 0.6s; }
.bento-card:nth-child(7) { animation-delay: 0.7s; }

@keyframes slideInUp {
    from {
        opacity: 0;
        transform: translateY(30px);
    }
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

/* Card Header */
.card-header {
    display: flex;
    align-items: center;
    gap: var(--space-md);
    margin-bottom: var(--space-lg);
}

.card-icon {
    color: var(--color-brand-primary);
    display: flex;
    align-items: center;
}

.card-title {
    font-size: 1.25rem;
    font-weight: var(--font-weight-semibold);
    color: var(--color-text-primary);
    flex: 1;
}

.item-count {
    background: var(--color-brand-tertiary);
    color: var(--color-brand-primary);
    padding: var(--space-xs) var(--space-sm);
    border-radius: var(--radius-sm);
    font-size: 0.75rem;
    font-weight: var(--font-weight-semibold);
}

/* Card Content */
.card-content {
    color: var(--color-text-secondary);
    line-height: 1.6;
}

.card-content p {
    margin-bottom: var(--space-md);
}

.card-content ul {
    list-style: none;
    padding: 0;
}

.card-content li {
    padding: var(--space-md) 0;
    border-bottom: 1px solid var(--color-border-primary);
}

.card-content li:last-child {
    border-bottom: none;
}

.empty-state {
    color: var(--color-text-tertiary);
    font-style: italic;
    text-align: center;
    padding: var(--space-lg);
}

/* Action Items Card */
.action-items-card .action-item {
    padding: var(--space-md);
    background: var(--color-bg-secondary);
    border-radius: var(--radius-md);
    margin-bottom: var(--space-md);
    transition: all var(--transition-fast);
}

.action-item:last-child {
    margin-bottom: 0;
}

.action-item.completed {
    opacity: 0.6;
    background: var(--color-bg-tertiary);
}

.action-item.completed .action-text {
    text-decoration: line-through;
}

.action-item-header {
    display: flex;
    align-items: flex-start;
    gap: var(--space-md);
    margin-bottom: var(--space-sm);
}

.action-checkbox {
    margin-top: 2px;
    accent-color: var(--color-brand-primary);
}

.action-text {
    flex: 1;
    font-weight: var(--font-weight-medium);
    color: var(--color-text-primary);
    cursor: pointer;
}

.priority-badge {
    padding: var(--space-xs) var(--space-sm);
    border-radius: var(--radius-sm);
    font-size: 0.75rem;
    font-weight: var(--font-weight-semibold);
    color: white;
}

.priority-high { background-color: var(--color-error); }
.priority-medium { background-color: var(--color-warning); }
.priority-low { background-color: var(--color-success); }

.action-details {
    display: flex;
    gap: var(--space-lg);
    font-size: 0.875rem;
    color: var(--color-text-tertiary);
    margin-left: calc(var(--space-md) + 16px);
}

/* Topic Items */
.topic-item {
    padding: var(--space-md) 0;
    border-bottom: 1px solid var(--color-border-primary);
}

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

.topic-title {
    font-size: 1rem;
    font-weight: var(--font-weight-semibold);
    color: var(--color-text-primary);
    margin-bottom: var(--space-xs);
}

.topic-summary {
    color: var(--color-text-secondary);
    line-height: 1.5;
}

/* Speaker Items */
.speaker-item {
    padding: var(--space-md) 0;
    border-bottom: 1px solid var(--color-border-primary);
}

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

.speaker-header {
    display: flex;
    align-items: center;
    gap: var(--space-md);
    margin-bottom: var(--space-xs);
}

.speaker-name {
    font-weight: var(--font-weight-semibold);
    color: var(--color-text-primary);
}

.speaker-tone {
    padding: var(--space-xs) var(--space-sm);
    border-radius: var(--radius-sm);
    font-size: 0.75rem;
    font-weight: var(--font-weight-medium);
}

.tone-positive { background: var(--color-success); color: white; }
.tone-neutral { background: var(--color-border-accent); color: var(--color-text-primary); }
.tone-negative { background: var(--color-error); color: white; }

.speaker-contribution {
    color: var(--color-text-secondary);
    line-height: 1.5;
}

/* Export Card */
.export-card .export-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(160px, 1fr));
    gap: var(--space-md);
}

.export-btn {
    display: flex;
    align-items: center;
    justify-content: center;
    gap: var(--space-sm);
    padding: var(--space-md) var(--space-lg);
    border: 1px solid var(--color-border-primary);
    border-radius: var(--radius-md);
    font-size: 0.875rem;
    font-weight: var(--font-weight-medium);
    cursor: pointer;
    transition: all var(--transition-fast);
    text-decoration: none;
    background: var(--color-bg-secondary);
    color: var(--color-text-primary);
}

.export-btn:hover {
    background: var(--color-bg-tertiary);
    transform: translateY(-1px);
    box-shadow: var(--shadow-sm);
}

.export-btn.primary {
    background: var(--color-brand-primary);
    color: var(--color-text-inverse);
    border-color: var(--color-brand-primary);
}

.export-btn.primary:hover {
    background: var(--color-brand-secondary);
}

/* Modals */
.modal {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    z-index: 1000;
    display: flex;
    align-items: center;
    justify-content: center;
    padding: var(--space-lg);
}

.modal-backdrop {
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background: rgba(0, 0, 0, 0.5);
    backdrop-filter: blur(4px);
}

.modal-content {
    position: relative;
    background: var(--color-bg-primary);
    border-radius: var(--radius-lg);
    width: 100%;
    max-width: 500px;
    max-height: 80vh;
    overflow: hidden;
    box-shadow: var(--shadow-xl);
    border: 1px solid var(--color-border-primary);
    animation: modalSlideIn var(--transition-normal) ease-out;
}

@keyframes modalSlideIn {
    from {
        opacity: 0;
        transform: scale(0.9) translateY(-20px);
    }
    to {
        opacity: 1;
        transform: scale(1) translateY(0);
    }
}

.modal-header {
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: var(--space-lg) var(--space-xl);
    border-bottom: 1px solid var(--color-border-primary);
    background: var(--color-bg-secondary);
}

.modal-header h3 {
    font-size: 1.25rem;
    font-weight: var(--font-weight-semibold);
    color: var(--color-text-primary);
}

.modal-close {
    display: flex;
    align-items: center;
    justify-content: center;
    width: 32px;
    height: 32px;
    border: none;
    background: none;
    border-radius: var(--radius-sm);
    cursor: pointer;
    color: var(--color-text-tertiary);
    transition: all var(--transition-fast);
}

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

.modal-body {
    padding: var(--space-xl);
}

.modal-body .form-group {
    margin-bottom: var(--space-lg);
}

.modal-body .form-group:last-child {
    margin-bottom: 0;
}

/* Checkbox Styling */
.checkbox-label {
    display: flex;
    align-items: center;
    gap: var(--space-md);
    cursor: pointer;
    font-weight: var(--font-weight-normal);
}

.checkbox-label input[type="checkbox"] {
    display: none;
}

.checkmark {
    width: 20px;
    height: 20px;
    border: 2px solid var(--color-border-primary);
    border-radius: var(--space-xs);
    background: var(--color-bg-secondary);
    position: relative;
    transition: all var(--transition-fast);
}

.checkbox-label input[type="checkbox"]:checked + .checkmark {
    background: var(--color-brand-primary);
    border-color: var(--color-brand-primary);
}

.checkbox-label input[type="checkbox"]:checked + .checkmark::after {
    content: '';
    position: absolute;
    left: 6px;
    top: 2px;
    width: 6px;
    height: 10px;
    border: solid white;
    border-width: 0 2px 2px 0;
    transform: rotate(45deg);
}

/* Button Styles */
.btn-primary {
    width: 100%;
    padding: var(--space-md) var(--space-lg);
    background: var(--gradient-brand);
    color: var(--color-text-inverse);
    border: none;
    border-radius: var(--radius-md);
    font-size: 1rem;
    font-weight: var(--font-weight-semibold);
    cursor: pointer;
    transition: all var(--transition-fast);
}

.btn-primary:hover {
    transform: translateY(-1px);
    box-shadow: var(--shadow-md);
}

/* Notifications */
.notification {
    position: fixed;
    top: var(--space-lg);
    right: var(--space-lg);
    background: var(--color-bg-primary);
    border: 1px solid var(--color-border-primary);
    border-radius: var(--radius-md);
    padding: var(--space-md) var(--space-lg);
    box-shadow: var(--shadow-lg);
    z-index: 10000;
    animation: notificationSlideIn var(--transition-normal) ease-out;
    max-width: 400px;
}

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

.notification.error {
    border-color: var(--color-error);
    color: var(--color-error);
}

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

/* Footer */
.footer {
    text-align: center;
    padding: var(--space-xl) 0;
    color: var(--color-text-tertiary);
    font-size: 0.875rem;
    border-top: 1px solid var(--color-border-primary);
    margin-top: auto;
}

/* Utility Classes */
.hidden { display: none !important; }

/* Responsive Design */
@media (max-width: 1200px) {
    .bento-card.large { grid-column: span 12; }
    .bento-card.medium { grid-column: span 6; }
    .bento-card.small { grid-column: span 6; }
}

@media (max-width: 768px) {
    .app-container {
        padding: 0 var(--space-md);
    }

    .header {
        padding: var(--space-xl) 0;
    }

    .header-content {
        flex-direction: column;
        gap: var(--space-lg);
        align-items: center;
    }

    .header-title {
        font-size: 2rem;
        text-align: center;
    }

    .header-subtitle {
        text-align: center;
    }

    .theme-toggle {
        align-self: flex-end;
    }

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

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

    .bento-card.large,
    .bento-card.medium,
    .bento-card.small {
        grid-column: span 1;
    }

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

    .modal-content {
        margin: var(--space-md);
        max-width: calc(100% - 2rem);
    }

    .action-details {
        flex-direction: column;
        gap: var(--space-xs);
    }
}

@media (max-width: 480px) {
    .input-area,
    .input-footer {
        padding: var(--space-lg);
    }

    .advanced-options {
        padding: 0 var(--space-lg) var(--space-lg);
    }

    .bento-card {
        padding: var(--space-lg);
    }

    .transcript-input {
        min-height: 150px;
    }
}