/* ========================================
   Modern Sentiment Analysis UI/UX
   Design System v2.0
   ======================================== */

/* Import Google Fonts */
@import url('https://fonts.googleapis.com/css2?family=Inter:wght@300;400;500;600;700;800&family=Poppins:wght@400;500;600;700&display=swap');

/* ========================================
   CSS Variables - Design Tokens
   ======================================== */
:root {
    /* Primary Colors - Modern Purple/Blue Gradient */
    --primary-50: #f0f4ff;
    --primary-100: #e0e7ff;
    --primary-200: #c7d2fe;
    --primary-300: #a5b4fc;
    --primary-400: #818cf8;
    --primary-500: #6366f1;
    --primary-600: #4f46e5;
    --primary-700: #4338ca;
    --primary-800: #3730a3;
    --primary-900: #312e81;

    /* Accent Colors - Vibrant Purple */
    --accent-500: #a855f7;
    --accent-600: #9333ea;
    --accent-700: #7e22ce;

    /* Success/Positive */
    --success-400: #4ade80;
    --success-500: #22c55e;
    --success-600: #16a34a;

    /* Error/Negative */
    --error-400: #f87171;
    --error-500: #ef4444;
    --error-600: #dc2626;

    /* Warning/Neutral */
    --warning-400: #fbbf24;
    --warning-500: #f59e0b;

    /* Gray Scale */
    --gray-50: #f9fafb;
    --gray-100: #f3f4f6;
    --gray-200: #e5e7eb;
    --gray-300: #d1d5db;
    --gray-400: #9ca3af;
    --gray-500: #6b7280;
    --gray-600: #4b5563;
    --gray-700: #374151;
    --gray-800: #1f2937;
    --gray-900: #111827;

    /* Typography */
    --font-primary: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', sans-serif;
    --font-display: 'Poppins', sans-serif;

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

    /* Border Radius */
    --radius-sm: 0.375rem;
    --radius-md: 0.5rem;
    --radius-lg: 0.75rem;
    --radius-xl: 1rem;
    --radius-2xl: 1.5rem;
    --radius-full: 9999px;

    /* Shadows */
    --shadow-sm: 0 1px 2px 0 rgb(0 0 0 / 0.05);
    --shadow-md: 0 4px 6px -1px rgb(0 0 0 / 0.1), 0 2px 4px -2px rgb(0 0 0 / 0.1);
    --shadow-lg: 0 10px 15px -3px rgb(0 0 0 / 0.1), 0 4px 6px -4px rgb(0 0 0 / 0.1);
    --shadow-xl: 0 20px 25px -5px rgb(0 0 0 / 0.1), 0 8px 10px -6px rgb(0 0 0 / 0.1);
    --shadow-2xl: 0 25px 50px -12px rgb(0 0 0 / 0.25);
    --shadow-glow: 0 0 30px rgba(99, 102, 241, 0.3);

    /* Transitions */
    --transition-fast: 150ms cubic-bezier(0.4, 0, 0.2, 1);
    --transition-base: 200ms cubic-bezier(0.4, 0, 0.2, 1);
    --transition-slow: 300ms cubic-bezier(0.4, 0, 0.2, 1);
}

/* ========================================
   Base Styles & Reset
   ======================================== */
* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

html {
    scroll-behavior: smooth;
}

body {
    font-family: var(--font-primary);
    background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    background-attachment: fixed;
    color: var(--gray-900);
    line-height: 1.6;
    min-height: 100vh;
    overflow-x: hidden;
}

/* ========================================
   Header & Navigation
   ======================================== */
header {
    background: rgba(255, 255, 255, 0.95);
    backdrop-filter: blur(10px);
    -webkit-backdrop-filter: blur(10px);
    padding: var(--spacing-lg) var(--spacing-xl);
    box-shadow: var(--shadow-md);
    position: sticky;
    top: 0;
    z-index: 1000;
    border-bottom: 1px solid rgba(99, 102, 241, 0.1);
}

nav {
    display: flex;
    justify-content: space-between;
    align-items: center;
    max-width: 1400px;
    margin: 0 auto;
}

/* Hamburger Menu */
.hamburger {
    display: flex;
    flex-direction: column;
    cursor: pointer;
    gap: 5px;
    padding: var(--spacing-sm);
    border-radius: var(--radius-md);
    transition: all var(--transition-base);
}

.hamburger:hover {
    background: var(--gray-100);
}

.hamburger .line {
    width: 28px;
    height: 3px;
    background: linear-gradient(135deg, var(--primary-600), var(--accent-600));
    border-radius: var(--radius-full);
    transition: all var(--transition-base);
}

.hamburger:hover .line {
    background: linear-gradient(135deg, var(--primary-700), var(--accent-700));
}

/* Sidebar */
.sidebar {
    width: 280px;
    background: linear-gradient(180deg, rgba(255, 255, 255, 0.98) 0%, rgba(255, 255, 255, 0.95) 100%);
    backdrop-filter: blur(20px);
    -webkit-backdrop-filter: blur(20px);
    position: fixed;
    top: 0;
    left: -100%;
    height: 100vh;
    transition: left var(--transition-slow);
    padding-top: 5rem;
    box-shadow: var(--shadow-2xl);
    z-index: 999;
    border-right: 1px solid rgba(99, 102, 241, 0.1);
}

.sidebar.active {
    left: 0;
}

.sidebar-header {
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    padding: var(--spacing-lg) var(--spacing-xl);
    background: linear-gradient(135deg, var(--primary-600), var(--accent-600));
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.sidebar-title {
    font-family: var(--font-display);
    font-size: 1.25rem;
    font-weight: 700;
    color: white;
    margin: 0;
}

.close-sidebar {
    background: rgba(255, 255, 255, 0.2);
    border: none;
    width: 36px;
    height: 36px;
    border-radius: var(--radius-full);
    font-size: 24px;
    cursor: pointer;
    color: white;
    display: flex;
    align-items: center;
    justify-content: center;
    transition: all var(--transition-base);
}

.close-sidebar:hover {
    background: rgba(255, 255, 255, 0.3);
    transform: rotate(90deg);
}

.sidebar ul {
    list-style: none;
    padding: var(--spacing-xl);
}

.sidebar li {
    margin-bottom: var(--spacing-md);
}

.sidebar li a {
    display: flex;
    align-items: center;
    color: var(--gray-700);
    text-decoration: none;
    padding: var(--spacing-md) var(--spacing-lg);
    border-radius: var(--radius-lg);
    font-weight: 500;
    transition: all var(--transition-base);
    position: relative;
    overflow: hidden;
}

.sidebar li a::before {
    content: '';
    position: absolute;
    left: 0;
    top: 0;
    height: 100%;
    width: 4px;
    background: linear-gradient(180deg, var(--primary-600), var(--accent-600));
    transform: scaleY(0);
    transition: transform var(--transition-base);
}

.sidebar li a:hover {
    background: linear-gradient(135deg, var(--primary-50), var(--primary-100));
    color: var(--primary-700);
    transform: translateX(8px);
}

.sidebar li a:hover::before {
    transform: scaleY(1);
}

.sidebar li a.active {
    background: linear-gradient(135deg, var(--primary-600), var(--accent-600));
    color: white;
    box-shadow: var(--shadow-md);
}

/* Sidebar Overlay */
.sidebar-overlay {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: rgba(17, 24, 39, 0.6);
    backdrop-filter: blur(4px);
    z-index: 998;
    opacity: 0;
    visibility: hidden;
    transition: all var(--transition-base);
}

.sidebar-overlay.active {
    opacity: 1;
    visibility: visible;
}

/* Right Navigation */
.right-nav {
    display: flex;
    align-items: center;
    gap: var(--spacing-md);
}

.right-nav a {
    text-decoration: none;
    color: var(--gray-700);
    padding: var(--spacing-sm) var(--spacing-lg);
    border-radius: var(--radius-lg);
    font-weight: 500;
    transition: all var(--transition-base);
}

.right-nav a:hover {
    color: var(--primary-600);
    background: var(--primary-50);
}

.get-started-button {
    background: linear-gradient(135deg, var(--primary-600), var(--accent-600));
    color: white;
    border: none;
    padding: var(--spacing-md) var(--spacing-xl);
    border-radius: var(--radius-full);
    font-weight: 600;
    cursor: pointer;
    transition: all var(--transition-base);
    box-shadow: var(--shadow-md);
    font-family: var(--font-primary);
}

.get-started-button:hover {
    transform: translateY(-2px);
    box-shadow: var(--shadow-xl), var(--shadow-glow);
}

/* ========================================
   Hero Section
   ======================================== */
.intro-container {
    max-width: 1400px;
    margin: var(--spacing-3xl) auto;
    padding: var(--spacing-3xl) var(--spacing-xl);
    background: rgba(255, 255, 255, 0.95);
    backdrop-filter: blur(10px);
    border-radius: var(--radius-2xl);
    box-shadow: var(--shadow-2xl);
}

.intro-columns {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: var(--spacing-3xl);
    align-items: center;
}

.intro-left h1 {
    font-family: var(--font-display);
    font-size: 3.5rem;
    font-weight: 800;
    background: linear-gradient(135deg, var(--primary-600), var(--accent-600));
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
    margin-bottom: var(--spacing-md);
    line-height: 1.2;
}

.intro-left h2 {
    font-size: 1.5rem;
    color: var(--gray-600);
    font-weight: 500;
    margin-bottom: var(--spacing-lg);
}

.intro-left p {
    font-size: 1.125rem;
    color: var(--gray-600);
    margin-bottom: var(--spacing-xl);
    line-height: 1.8;
}

.learn-more-button {
    background: linear-gradient(135deg, var(--primary-600), var(--accent-600));
    color: white;
    border: none;
    padding: var(--spacing-lg) var(--spacing-2xl);
    border-radius: var(--radius-full);
    font-size: 1.125rem;
    font-weight: 600;
    cursor: pointer;
    transition: all var(--transition-base);
    box-shadow: var(--shadow-lg);
    font-family: var(--font-primary);
}

.learn-more-button:hover {
    transform: translateY(-3px);
    box-shadow: var(--shadow-2xl), var(--shadow-glow);
}

.tech-icons {
    margin-top: var(--spacing-xl);
    display: flex;
    gap: var(--spacing-md);
    flex-wrap: wrap;
}

.tech-icon {
    font-size: 2.5rem;
    opacity: 0.6;
    transition: all var(--transition-base);
    cursor: pointer;
}

.tech-icon:hover {
    opacity: 1;
    transform: translateY(-5px) scale(1.1);
}

.intro-right {
    text-align: center;
}

.intro-gif {
    max-width: 100%;
    height: auto;
    border-radius: var(--radius-xl);
    box-shadow: var(--shadow-xl);
    transition: transform var(--transition-slow);
}

.intro-gif:hover {
    transform: scale(1.02);
}

/* ========================================
   Main Container
   ======================================== */
.container {
    max-width: 1200px;
    margin: var(--spacing-3xl) auto;
    padding: var(--spacing-3xl) var(--spacing-xl);
    background: rgba(255, 255, 255, 0.95);
    backdrop-filter: blur(10px);
    border-radius: var(--radius-2xl);
    box-shadow: var(--shadow-2xl);
}

.container h1 {
    font-family: var(--font-display);
    font-size: 2.5rem;
    font-weight: 700;
    text-align: center;
    background: linear-gradient(135deg, var(--primary-600), var(--accent-600));
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
    margin-bottom: var(--spacing-2xl);
}

/* ========================================
   Upload Section
   ======================================== */
#upload-section {
    text-align: center;
    padding: var(--spacing-2xl);
    background: linear-gradient(135deg, var(--primary-50), var(--primary-100));
    border-radius: var(--radius-xl);
    margin-bottom: var(--spacing-2xl);
}

#upload-section p {
    font-size: 1.125rem;
    color: var(--gray-600);
    margin-bottom: var(--spacing-xl);
}

#sentiment-form {
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: var(--spacing-lg);
}

.file-upload-label {
    display: inline-flex;
    align-items: center;
    gap: var(--spacing-md);
    padding: var(--spacing-lg) var(--spacing-2xl);
    background: white;
    color: var(--primary-600);
    border: 2px dashed var(--primary-300);
    border-radius: var(--radius-lg);
    cursor: pointer;
    font-weight: 600;
    font-size: 1rem;
    transition: all var(--transition-base);
    box-shadow: var(--shadow-sm);
}

.file-upload-label:hover {
    border-color: var(--primary-600);
    background: var(--primary-50);
    transform: translateY(-2px);
    box-shadow: var(--shadow-md);
}

input[type="file"] {
    display: none;
}

.selected-file-display {
    font-size: 0.9375rem;
    color: var(--gray-700);
    padding: var(--spacing-md);
    background: linear-gradient(135deg, var(--primary-50), var(--primary-100));
    border-radius: var(--radius-md);
    border: 1px solid var(--primary-200);
    display: none;
    align-items: center;
    gap: var(--spacing-sm);
    font-weight: 500;
    animation: slideInUp 0.3s ease-out;
}

.selected-file-display.active {
    display: flex;
}

.selected-file-display i {
    color: var(--primary-600);
    font-size: 1.125rem;
}

.selected-file-display .file-name {
    flex: 1;
    color: var(--primary-700);
    font-weight: 600;
}

.selected-file-display .file-size {
    color: var(--gray-500);
    font-size: 0.875rem;
}

.selected-file-display .remove-file {
    background: none;
    border: none;
    color: var(--error-500);
    cursor: pointer;
    padding: var(--spacing-xs);
    border-radius: var(--radius-sm);
    transition: all var(--transition-base);
    font-size: 1.125rem;
}

.selected-file-display .remove-file:hover {
    background: var(--error-50);
    color: var(--error-600);
}


.submit-button {
    background: linear-gradient(135deg, var(--success-500), var(--success-600));
    color: white;
    border: none;
    padding: var(--spacing-lg) var(--spacing-3xl);
    border-radius: var(--radius-full);
    font-size: 1.125rem;
    font-weight: 600;
    cursor: pointer;
    transition: all var(--transition-base);
    box-shadow: var(--shadow-lg);
    font-family: var(--font-primary);
}

.submit-button:hover {
    transform: translateY(-2px);
    box-shadow: var(--shadow-xl);
    background: linear-gradient(135deg, var(--success-600), var(--success-600));
}

.submit-button:active {
    transform: translateY(0);
}

/* ========================================
   Status Messages
   ======================================== */
.status-message {
    margin-top: var(--spacing-xl);
    text-align: center;
}

.analyzing-animation {
    display: inline-flex;
    align-items: center;
    gap: var(--spacing-md);
    font-size: 1.125rem;
    color: var(--primary-700);
    background: linear-gradient(135deg, var(--primary-50), var(--primary-100));
    padding: var(--spacing-lg) var(--spacing-xl);
    border-radius: var(--radius-xl);
    box-shadow: var(--shadow-md);
}

.analyzing-text {
    font-weight: 600;
}

.dots-animation {
    display: inline-flex;
    gap: 6px;
}

.dots-animation span {
    width: 8px;
    height: 8px;
    background: var(--primary-600);
    border-radius: var(--radius-full);
    animation: bounce 1.4s infinite ease-in-out both;
}

.dots-animation span:nth-child(1) {
    animation-delay: -0.32s;
}

.dots-animation span:nth-child(2) {
    animation-delay: -0.16s;
}

@keyframes bounce {

    0%,
    80%,
    100% {
        transform: scale(0);
        opacity: 0.5;
    }

    40% {
        transform: scale(1);
        opacity: 1;
    }
}

.progress-bar {
    width: 100%;
    height: 6px;
    background: var(--gray-200);
    border-radius: var(--radius-full);
    margin-top: var(--spacing-md);
    overflow: hidden;
}

.progress-bar-fill {
    height: 100%;
    background: linear-gradient(90deg, var(--primary-600), var(--accent-600), var(--primary-600));
    background-size: 200% 100%;
    border-radius: var(--radius-full);
    animation: progress-shimmer 2s infinite;
}

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

    100% {
        background-position: 200% 0%;
    }
}

.success-animation {
    display: inline-flex;
    align-items: center;
    gap: var(--spacing-md);
    font-size: 1.125rem;
    color: var(--success-700);
    background: linear-gradient(135deg, rgba(34, 197, 94, 0.1), rgba(22, 163, 74, 0.15));
    padding: var(--spacing-lg) var(--spacing-xl);
    border-radius: var(--radius-xl);
    box-shadow: var(--shadow-md);
    animation: slideInUp 0.5s ease-out;
}

.success-text {
    font-weight: 600;
}

.checkmark {
    width: 24px;
    height: 24px;
}

.checkmark-circle {
    stroke-dasharray: 166;
    stroke-dashoffset: 166;
    stroke-width: 3;
    stroke: var(--success-500);
    fill: none;
    animation: stroke-animate 0.6s cubic-bezier(0.65, 0, 0.45, 1) forwards;
}

.checkmark-check {
    transform-origin: 50% 50%;
    stroke-dasharray: 48;
    stroke-dashoffset: 48;
    stroke: var(--success-500);
    stroke-width: 3;
    fill: none;
    animation: stroke-animate 0.3s cubic-bezier(0.65, 0, 0.45, 1) 0.8s forwards;
}

@keyframes stroke-animate {
    100% {
        stroke-dashoffset: 0;
    }
}

@keyframes slideInUp {
    from {
        opacity: 0;
        transform: translateY(20px);
    }

    to {
        opacity: 1;
        transform: translateY(0);
    }
}

.error-animation {
    display: inline-flex;
    align-items: center;
    gap: var(--spacing-md);
    font-size: 1.125rem;
    color: var(--error-700);
    background: linear-gradient(135deg, rgba(239, 68, 68, 0.1), rgba(220, 38, 38, 0.15));
    padding: var(--spacing-lg) var(--spacing-xl);
    border-radius: var(--radius-xl);
    box-shadow: var(--shadow-md);
    animation: shake 0.5s ease-in-out;
}

.error-text {
    font-weight: 600;
}

.error-icon {
    width: 24px;
    height: 24px;
    position: relative;
}

.error-icon::before,
.error-icon::after {
    content: '';
    position: absolute;
    width: 20px;
    height: 3px;
    background-color: var(--error-500);
    border-radius: var(--radius-full);
    top: 50%;
    left: 50%;
}

.error-icon::before {
    transform: translate(-50%, -50%) rotate(45deg);
}

.error-icon::after {
    transform: translate(-50%, -50%) rotate(-45deg);
}

@keyframes shake {

    0%,
    100% {
        transform: translateX(0);
    }

    25% {
        transform: translateX(-10px);
    }

    75% {
        transform: translateX(10px);
    }
}

/* ========================================
   Results Section
   ======================================== */
.hidden {
    display: none;
}

#analysis-results {
    margin-top: var(--spacing-3xl);
}

#analysis-results h2 {
    font-family: var(--font-display);
    font-size: 2rem;
    font-weight: 700;
    text-align: center;
    background: linear-gradient(135deg, var(--primary-600), var(--accent-600));
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
    margin-bottom: var(--spacing-2xl);
}

/* Summary Stats */
.summary-stats {
    background: linear-gradient(135deg, var(--gray-50), white);
    padding: var(--spacing-2xl);
    border-radius: var(--radius-xl);
    margin-bottom: var(--spacing-2xl);
    box-shadow: var(--shadow-md);
    border: 1px solid var(--gray-200);
}

.summary-stats h3 {
    font-family: var(--font-display);
    font-size: 1.5rem;
    font-weight: 600;
    color: var(--gray-800);
    margin-bottom: var(--spacing-lg);
}

.summary-stats p {
    font-size: 1.125rem;
    color: var(--gray-600);
    margin-bottom: var(--spacing-md);
}

.sentiment-breakdown {
    margin-top: var(--spacing-xl);
}

.sentiment-breakdown h4 {
    font-size: 1.25rem;
    font-weight: 600;
    color: var(--gray-700);
    margin-bottom: var(--spacing-md);
}

.sentiment-breakdown ul {
    list-style: none;
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
    gap: var(--spacing-md);
}

.sentiment-breakdown li {
    background: white;
    padding: var(--spacing-lg);
    border-radius: var(--radius-lg);
    box-shadow: var(--shadow-sm);
    border-left: 4px solid var(--primary-500);
    font-weight: 500;
    transition: all var(--transition-base);
}

.sentiment-breakdown li:hover {
    transform: translateY(-2px);
    box-shadow: var(--shadow-md);
}

/* Visualizations */
.visualizations {
    margin-top: var(--spacing-2xl);
}

.viz-row {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(400px, 1fr));
    gap: var(--spacing-xl);
    margin-bottom: var(--spacing-xl);
}

.viz-item {
    background: white;
    padding: var(--spacing-xl);
    border-radius: var(--radius-xl);
    box-shadow: var(--shadow-lg);
    transition: all var(--transition-slow);
    border: 1px solid var(--gray-200);
}

.viz-item:hover {
    transform: translateY(-5px);
    box-shadow: var(--shadow-2xl);
}

.viz-item h3 {
    font-family: var(--font-display);
    font-size: 1.25rem;
    font-weight: 600;
    color: var(--gray-800);
    margin-bottom: var(--spacing-lg);
    padding-bottom: var(--spacing-md);
    border-bottom: 2px solid var(--primary-200);
}

.viz-item img {
    width: 100%;
    height: auto;
    border-radius: var(--radius-md);
}

/* Example Reviews */
.example-reviews {
    margin-top: var(--spacing-3xl);
}

.example-reviews h3 {
    font-family: var(--font-display);
    font-size: 1.75rem;
    font-weight: 600;
    color: var(--gray-800);
    margin-bottom: var(--spacing-xl);
    text-align: center;
}

.review-box {
    background: white;
    padding: var(--spacing-xl);
    border-radius: var(--radius-xl);
    margin-bottom: var(--spacing-lg);
    box-shadow: var(--shadow-md);
    transition: all var(--transition-base);
    border-left: 6px solid;
}

.review-box:hover {
    transform: translateX(5px);
    box-shadow: var(--shadow-lg);
}

.review-box.positive {
    border-left-color: var(--success-500);
    background: linear-gradient(135deg, white, rgba(34, 197, 94, 0.03));
}

.review-box.negative {
    border-left-color: var(--error-500);
    background: linear-gradient(135deg, white, rgba(239, 68, 68, 0.03));
}

.review-box h4 {
    font-family: var(--font-display);
    font-size: 1.125rem;
    font-weight: 600;
    margin-bottom: var(--spacing-md);
}

.review-box.positive h4 {
    color: var(--success-600);
}

.review-box.negative h4 {
    color: var(--error-600);
}

.review-box p {
    color: var(--gray-700);
    line-height: 1.8;
    font-size: 1rem;
}

/* ========================================
   Enhanced Analysis Results
   ======================================== */
.results-header {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
    gap: var(--spacing-xl);
    margin-bottom: var(--spacing-3xl);
}

.overall-sentiment-card {
    background: white;
    padding: var(--spacing-2xl);
    border-radius: var(--radius-xl);
    border-left: 6px solid;
    box-shadow: var(--shadow-lg);
    display: flex;
    gap: var(--spacing-lg);
    align-items: center;
    grid-column: span 2;
}

.sentiment-icon {
    font-size: 3.5rem;
    width: 80px;
    height: 80px;
    display: flex;
    align-items: center;
    justify-content: center;
    background: rgba(99, 102, 241, 0.1);
    border-radius: var(--radius-full);
}

.sentiment-info h3 {
    font-size: 1.125rem;
    color: var(--gray-600);
    margin: 0 0 var(--spacing-sm) 0;
}

.sentiment-label {
    font-size: 2rem;
    font-weight: 700;
    margin: var(--spacing-xs) 0;
}

.sentiment-score {
    font-size: 0.9375rem;
    color: var(--gray-500);
}

.stats-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(150px, 1fr));
    gap: var(--spacing-lg);
    grid-column: 1 / -1;
}

.stat-card {
    background: white;
    padding: var(--spacing-xl);
    border-radius: var(--radius-xl);
    box-shadow: var(--shadow-md);
    display: flex;
    flex-direction: column;
    align-items: center;
    text-align: center;
    transition: all var(--transition-base);
    border-top: 4px solid var(--primary-500);
}

.stat-card:hover {
    transform: translateY(-5px);
    box-shadow: var(--shadow-xl);
}

.stat-card.positive {
    border-top-color: var(--success-500);
}

.stat-card.negative {
    border-top-color: var(--error-500);
}

.stat-card.neutral {
    border-top-color: var(--warning-500);
}

.stat-icon {
    font-size: 2.5rem;
    color: var(--primary-600);
    margin-bottom: var(--spacing-md);
}

.stat-card.positive .stat-icon {
    color: var(--success-500);
}

.stat-card.negative .stat-icon {
    color: var(--error-500);
}

.stat-card.neutral .stat-icon {
    color: var(--warning-500);
}

.stat-content {
    width: 100%;
}

.stat-value {
    font-size: 2.5rem;
    font-weight: 800;
    color: var(--gray-800);
    line-height: 1;
    margin-bottom: var(--spacing-xs);
}

.stat-label {
    font-size: 0.875rem;
    color: var(--gray-600);
    font-weight: 500;
    text-transform: uppercase;
    letter-spacing: 0.5px;
}

.stat-percent {
    font-size: 1.125rem;
    color: var(--primary-600);
    font-weight: 600;
    margin-top: var(--spacing-xs);
}

.sentiment-breakdown-modern {
    background: white;
    padding: var(--spacing-2xl);
    border-radius: var(--radius-xl);
    box-shadow: var(--shadow-lg);
    margin-bottom: var(--spacing-3xl);
}

.sentiment-breakdown-modern h3 {
    font-family: var(--font-display);
    font-size: 1.5rem;
    color: var(--gray-800);
    margin-bottom: var(--spacing-xl);
}

.progress-bars {
    display: flex;
    flex-direction: column;
    gap: var(--spacing-lg);
}

.progress-item {
    width: 100%;
}

.progress-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: var(--spacing-sm);
}

.progress-label {
    font-weight: 600;
    color: var(--gray-700);
    display: flex;
    align-items: center;
    gap: var(--spacing-sm);
}

.progress-value {
    font-weight: 700;
    color: var(--gray-800);
}

.progress-bar-container {
    width: 100%;
    height: 32px;
    background: var(--gray-200);
    border-radius: var(--radius-full);
    overflow: hidden;
    position: relative;
}

.progress-bar-fill {
    height: 100%;
    border-radius: var(--radius-full);
    transition: width 1s ease-out;
    position: relative;
    overflow: hidden;
}

.progress-bar-fill::after {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    bottom: 0;
    right: 0;
    background: linear-gradient(90deg,
            transparent,
            rgba(255, 255, 255, 0.3),
            transparent);
    animation: shimmer 2s infinite;
}

@keyframes shimmer {
    0% {
        transform: translateX(-100%);
    }

    100% {
        transform: translateX(100%);
    }
}

.progress-bar-fill.positive {
    background: linear-gradient(90deg, var(--success-400), var(--success-600));
}

.progress-bar-fill.negative {
    background: linear-gradient(90deg, var(--error-400), var(--error-600));
}

.progress-bar-fill.neutral {
    background: linear-gradient(90deg, var(--warning-400), var(--warning-500));
}

.section-title {
    font-family: var(--font-display);
    font-size: 2rem;
    font-weight: 700;
    color: var(--gray-800);
    margin: var(--spacing-3xl) 0 var(--spacing-xl) 0;
    display: flex;
    align-items: center;
    gap: var(--spacing-md);
}

.section-title i {
    color: var(--primary-600);
}

.viz-full {
    grid-column: 1 / -1;
}

.reviews-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(400px, 1fr));
    gap: var(--spacing-2xl);
    margin-top: var(--spacing-xl);
}

.review-card {
    background: white;
    padding: var(--spacing-2xl);
    border-radius: var(--radius-xl);
    border-left: 6px solid;
    box-shadow: var(--shadow-lg);
    transition: all var(--transition-slow);
    position: relative;
    overflow: hidden;
}

.review-card.positive {
    border-left-color: var(--success-500);
}

.review-card.negative {
    border-left-color: var(--error-500);
}

.review-card:hover {
    transform: translateY(-8px);
    box-shadow: var(--shadow-2xl);
}

.review-badge {
    display: inline-flex;
    align-items: center;
    gap: var(--spacing-sm);
    padding: var(--spacing-sm) var(--spacing-lg);
    background: linear-gradient(135deg, var(--success-500), var(--success-600));
    color: white;
    border-radius: var(--radius-full);
    font-size: 0.875rem;
    font-weight: 600;
    margin-bottom: var(--spacing-lg);
}

.review-badge.negative {
    background: linear-gradient(135deg, var(--error-500), var(--error-600));
}

.review-content {
    position: relative;
    padding-left: var(--spacing-2xl);
}

.quote-icon {
    position: absolute;
    left: 0;
    top: 0;
    font-size: 1.5rem;
    color: var(--primary-200);
}

.review-content p {
    font-size: 1.125rem;
    line-height: 1.8;
    color: var(--gray-700);
    font-style: italic;
    margin: 0;
}

.review-footer {
    display: flex;
    align-items: center;
    gap: var(--spacing-sm);
    margin-top: var(--spacing-lg);
    padding-top: var(--spacing-lg);
    border-top: 1px solid var(--gray-200);
    color: var(--gray-600);
    font-size: 0.9375rem;
    font-weight: 500;
}

.review-footer i {
    font-size: 1.125rem;
}

.review-card.positive .review-footer {
    color: var(--success-600);
}

.review-card.negative .review-footer {
    color: var(--error-600);
}

/* Fade-in animation for results */
.fade-in {
    opacity: 0;
    transform: translateY(20px);
    transition: all 0.6s ease-out;
}


/* ========================================
   Responsive Design
   ======================================== */
@media (max-width: 1024px) {
    .intro-columns {
        grid-template-columns: 1fr;
    }

    .viz-row {
        grid-template-columns: 1fr;
    }
}

@media (max-width: 768px) {
    :root {
        --spacing-3xl: 2rem;
    }

    .intro-left h1 {
        font-size: 2.5rem;
    }

    .intro-left h2 {
        font-size: 1.25rem;
    }

    .container h1 {
        font-size: 2rem;
    }

    .right-nav a {
        display: none;
    }

    .sentiment-breakdown ul {
        grid-template-columns: 1fr;
    }
}

@media (max-width: 640px) {
    header {
        padding: var(--spacing-md);
    }

    .intro-container,
    .container {
        padding: var(--spacing-xl) var(--spacing-md);
        margin: var(--spacing-xl) var(--spacing-md);
    }

    .intro-left h1 {
        font-size: 2rem;
    }

    .viz-row {
        grid-template-columns: 1fr;
        gap: var(--spacing-md);
    }
}

/* ========================================
   Utility Classes
   ======================================== */
.text-gradient {
    background: linear-gradient(135deg, var(--primary-600), var(--accent-600));
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

.glassmorphism {
    background: rgba(255, 255, 255, 0.95);
    backdrop-filter: blur(10px);
    -webkit-backdrop-filter: blur(10px);
}

/* ========================================
   Animations & Micro-interactions
   ======================================== */
@keyframes fadeIn {
    from {
        opacity: 0;
        transform: translateY(20px);
    }

    to {
        opacity: 1;
        transform: translateY(0);
    }
}

.fade-in {
    animation: fadeIn 0.6s ease-out;
}

/* Smooth scroll padding for fixed header */
html {
    scroll-padding-top: 100px;
}