app/static/css/style.css

/* =====================================================
   RATING PREDICTOR - CUSTOM STYLES
   Features: Dark Mode, Toast, Skeleton, Highlighting
===================================================== */

/* ============ CSS VARIABLES ============ */
:root {
    /* Light mode colors */
    --bg-primary: #f0f5ff;
    --bg-secondary: #ffffff;
    --bg-gradient-from: #eff6ff;
    --bg-gradient-to: #e0e7ff;
    --text-primary: #1f2937;
    --text-secondary: #4b5563;
    --text-muted: #6b7280;
    --border-color: #d1d5db;
    --card-bg: #ffffff;
    --card-shadow: rgba(0, 0, 0, 0.1);
    --header-bg: #ffffff;
    --input-bg: #ffffff;
    --table-hover: #f9fafb;
}

/* Dark mode colors */
.dark {
    --bg-primary: #0f172a;
    --bg-secondary: #1e293b;
    --bg-gradient-from: #0f172a;
    --bg-gradient-to: #1e1b4b;
    --text-primary: #f1f5f9;
    --text-secondary: #cbd5e1;
    --text-muted: #94a3b8;
    --border-color: #334155;
    --card-bg: #1e293b;
    --card-shadow: rgba(0, 0, 0, 0.3);
    --header-bg: #1e293b;
    --input-bg: #334155;
    --table-hover: #334155;
}

/* Apply variables to body */
body {
    background: linear-gradient(to bottom right, var(--bg-gradient-from), var(--bg-gradient-to));
    color: var(--text-primary);
    transition: background 0.3s ease, color 0.3s ease;
}

.dark body {
    background: linear-gradient(to bottom right, var(--bg-gradient-from), var(--bg-gradient-to));
}

/* ============ DARK MODE COMPONENTS ============ */
.dark .bg-white {
    background-color: var(--card-bg) !important;
}

.dark .bg-gray-100 {
    background-color: #334155 !important;
}

.dark .bg-gray-50 {
    background-color: #1e293b !important;
}

.dark .text-gray-800 {
    color: var(--text-primary) !important;
}

.dark .text-gray-700 {
    color: var(--text-secondary) !important;
}

.dark .text-gray-600 {
    color: var(--text-muted) !important;
}

.dark .text-gray-500 {
    color: var(--text-muted) !important;
}

.dark .border-gray-300 {
    border-color: var(--border-color) !important;
}

.dark .border-gray-200 {
    border-color: var(--border-color) !important;
}

.dark input, .dark textarea, .dark select {
    background-color: var(--input-bg) !important;
    border-color: var(--border-color) !important;
    color: var(--text-primary) !important;
}

.dark input::placeholder, .dark textarea::placeholder {
    color: var(--text-muted) !important;
}

.dark .shadow-lg, .dark .shadow-md, .dark .shadow {
    box-shadow: 0 4px 6px -1px var(--card-shadow), 0 2px 4px -1px var(--card-shadow) !important;
}

.dark .hover\:bg-gray-50:hover {
    background-color: var(--table-hover) !important;
}

.dark .divide-gray-200 > * + * {
    border-color: var(--border-color) !important;
}

/* ============ TOAST NOTIFICATIONS ============ */
.toast-container {
    position: fixed;
    top: 20px;
    right: 20px;
    z-index: 9999;
    display: flex;
    flex-direction: column;
    gap: 10px;
    max-width: 400px;
}

.toast {
    display: flex;
    align-items: center;
    padding: 16px 20px;
    border-radius: 12px;
    box-shadow: 0 10px 25px rgba(0, 0, 0, 0.15);
    animation: slideIn 0.3s ease-out, fadeOut 0.3s ease-in forwards;
    animation-delay: 0s, var(--toast-duration, 3s);
    backdrop-filter: blur(10px);
}

.toast-success {
    background: linear-gradient(135deg, #10b981, #059669);
    color: white;
}

.toast-error {
    background: linear-gradient(135deg, #ef4444, #dc2626);
    color: white;
}

.toast-warning {
    background: linear-gradient(135deg, #f59e0b, #d97706);
    color: white;
}

.toast-info {
    background: linear-gradient(135deg, #3b82f6, #2563eb);
    color: white;
}

.toast-icon {
    font-size: 1.5rem;
    margin-right: 12px;
}

.toast-content {
    flex: 1;
}

.toast-title {
    font-weight: 600;
    font-size: 0.95rem;
    margin-bottom: 2px;
}

.toast-message {
    font-size: 0.85rem;
    opacity: 0.9;
}

.toast-close {
    background: none;
    border: none;
    color: white;
    cursor: pointer;
    padding: 4px;
    margin-left: 12px;
    opacity: 0.7;
    transition: opacity 0.2s;
}

.toast-close:hover {
    opacity: 1;
}

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

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

/* ============ LOADING SKELETON ============ */
.skeleton {
    background: linear-gradient(90deg, #e5e7eb 25%, #f3f4f6 50%, #e5e7eb 75%);
    background-size: 200% 100%;
    animation: shimmer 1.5s infinite;
    border-radius: 8px;
}

.dark .skeleton {
    background: linear-gradient(90deg, #334155 25%, #475569 50%, #334155 75%);
    background-size: 200% 100%;
}

@keyframes shimmer {
    0% {
        background-position: 200% 0;
    }
    100% {
        background-position: -200% 0;
    }
}

.skeleton-text {
    height: 16px;
    margin-bottom: 8px;
}

.skeleton-text-sm {
    height: 12px;
    margin-bottom: 6px;
}

.skeleton-title {
    height: 24px;
    width: 60%;
    margin-bottom: 12px;
}

.skeleton-box {
    height: 100px;
    width: 100%;
}

.skeleton-circle {
    border-radius: 50%;
}

.skeleton-card {
    padding: 20px;
    background: var(--card-bg);
    border-radius: 12px;
}

/* Loading overlay */
.loading-overlay {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background: rgba(0, 0, 0, 0.5);
    display: flex;
    align-items: center;
    justify-content: center;
    z-index: 9998;
    backdrop-filter: blur(4px);
}

.loading-spinner {
    width: 50px;
    height: 50px;
    border: 4px solid rgba(255, 255, 255, 0.3);
    border-top-color: #ffffff;
    border-radius: 50%;
    animation: spin 1s linear infinite;
}

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

/* ============ KEYWORD HIGHLIGHTING ============ */
.highlight-positive {
    background: linear-gradient(120deg, #bbf7d0 0%, #86efac 100%);
    padding: 2px 6px;
    border-radius: 4px;
    color: #166534;
    font-weight: 500;
}

.highlight-negative {
    background: linear-gradient(120deg, #fecaca 0%, #fca5a5 100%);
    padding: 2px 6px;
    border-radius: 4px;
    color: #991b1b;
    font-weight: 500;
}

.highlight-neutral {
    background: linear-gradient(120deg, #fef3c7 0%, #fde68a 100%);
    padding: 2px 6px;
    border-radius: 4px;
    color: #92400e;
    font-weight: 500;
}

.dark .highlight-positive {
    background: linear-gradient(120deg, #166534 0%, #15803d 100%);
    color: #bbf7d0;
}

.dark .highlight-negative {
    background: linear-gradient(120deg, #991b1b 0%, #b91c1c 100%);
    color: #fecaca;
}

.dark .highlight-neutral {
    background: linear-gradient(120deg, #92400e 0%, #a16207 100%);
    color: #fef3c7;
}

/* ============ EXPLANATION/INTERPRETABILITY ============ */
.explanation-container {
    margin-top: 16px;
    padding: 16px;
    background: linear-gradient(135deg, #f8fafc, #f1f5f9);
    border-radius: 12px;
    border: 1px solid #e2e8f0;
}

.dark .explanation-container {
    background: linear-gradient(135deg, #1e293b, #334155);
    border-color: #475569;
}

.word-importance {
    display: inline-flex;
    align-items: center;
    margin: 4px;
    padding: 4px 10px;
    border-radius: 20px;
    font-size: 0.875rem;
    transition: transform 0.2s;
}

.word-importance:hover {
    transform: scale(1.1);
}

.importance-bar {
    height: 24px;
    border-radius: 4px;
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: 0 8px;
    margin-bottom: 4px;
    font-size: 0.8rem;
    font-weight: 500;
}

.importance-positive {
    background: linear-gradient(90deg, rgba(34, 197, 94, 0.2), rgba(34, 197, 94, 0.6));
    color: #166534;
}

.importance-negative {
    background: linear-gradient(90deg, rgba(239, 68, 68, 0.6), rgba(239, 68, 68, 0.2));
    color: #991b1b;
}

.dark .importance-positive {
    color: #86efac;
}

.dark .importance-negative {
    color: #fca5a5;
}

/* ============ N-GRAM ANALYSIS ============ */
.ngram-container {
    display: flex;
    flex-wrap: wrap;
    gap: 8px;
    margin-top: 12px;
}

.ngram-badge {
    display: inline-flex;
    align-items: center;
    gap: 6px;
    padding: 6px 12px;
    background: linear-gradient(135deg, #818cf8, #6366f1);
    color: white;
    border-radius: 20px;
    font-size: 0.85rem;
    transition: transform 0.2s, box-shadow 0.2s;
}

.ngram-badge:hover {
    transform: translateY(-2px);
    box-shadow: 0 4px 12px rgba(99, 102, 241, 0.4);
}

.ngram-count {
    background: rgba(255, 255, 255, 0.2);
    padding: 2px 8px;
    border-radius: 12px;
    font-size: 0.75rem;
    font-weight: 600;
}

.ngram-chart-container {
    height: 300px;
    margin-top: 16px;
}

/* ============ DARK MODE TOGGLE ============ */
.dark-mode-toggle {
    position: relative;
    width: 60px;
    height: 30px;
    background: linear-gradient(135deg, #fbbf24, #f59e0b);
    border-radius: 15px;
    cursor: pointer;
    transition: background 0.3s;
    border: none;
    padding: 0;
}

.dark .dark-mode-toggle {
    background: linear-gradient(135deg, #1e3a5f, #0f172a);
}

.dark-mode-toggle::before {
    content: '☀️';
    position: absolute;
    left: 4px;
    top: 50%;
    transform: translateY(-50%);
    font-size: 18px;
    transition: opacity 0.3s;
}

.dark .dark-mode-toggle::before {
    opacity: 0;
}

.dark-mode-toggle::after {
    content: '🌙';
    position: absolute;
    right: 4px;
    top: 50%;
    transform: translateY(-50%);
    font-size: 18px;
    opacity: 0;
    transition: opacity 0.3s;
}

.dark .dark-mode-toggle::after {
    opacity: 1;
}

.toggle-ball {
    position: absolute;
    width: 24px;
    height: 24px;
    background: white;
    border-radius: 50%;
    top: 3px;
    left: 3px;
    transition: transform 0.3s;
    box-shadow: 0 2px 4px rgba(0, 0, 0, 0.2);
}

.dark .toggle-ball {
    transform: translateX(30px);
}

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

.fade-in {
    animation: fadeIn 0.3s ease-out;
}

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

.pulse {
    animation: pulse 2s infinite;
}

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

.bounce {
    animation: bounce 0.5s ease;
}

/* ============ RESPONSIVE ============ */
@media (max-width: 640px) {
    .toast-container {
        left: 10px;
        right: 10px;
        max-width: none;
    }
    
    .toast {
        padding: 12px 16px;
    }
}