/**
 * World-Class Professional Resume Builder Design
 * Traditional Resume Format with Modern UI/UX
 * 
 * This stylesheet implements a premium design system with:
 * - Professional color palette with gradients
 * - Glassmorphism effects and modern shadows
 * - Responsive layout with CSS Grid and Flexbox
 * - Smooth animations and micro-interactions
 * - Traditional resume styling for print-ready output
 */

/* ==========================================================================
   CSS CUSTOM PROPERTIES (DESIGN TOKENS)
   ========================================================================== */

:root {
    /* 
     * Premium Color Palette
     * Professional gradients for modern UI elements
     */
    --primary-gradient: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    --secondary-gradient: linear-gradient(135deg, #f093fb 0%, #f5576c 100%);
    --accent-gradient: linear-gradient(135deg, #4facfe 0%, #00f2fe 100%);
    --dark-gradient: linear-gradient(135deg, #30cfd0 0%, #330867 100%);
    
    /* 
     * Professional Colors
     * Semantic color system for consistent theming
     */
    --primary: #667eea;      /* Main brand color */
    --primary-dark: #5a6fd8; /* Darker variant for hover states */
    --primary-light: #7b8ff0; /* Lighter variant for accents */
    --secondary: #764ba2;    /* Secondary brand color */
    --accent: #4facfe;       /* Accent color for highlights */
    --success: #10b981;      /* Success states (green) */
    --warning: #f59e0b;      /* Warning states (amber) */
    --error: #ef4444;        /* Error states (red) */
    
    /* 
     * Neutral Colors
     * Gray scale for text, backgrounds, and borders
     */
    --white: #ffffff;
    --gray-50: #f9fafb;      /* Lightest backgrounds */
    --gray-100: #f3f4f6;     /* Light backgrounds */
    --gray-200: #e5e7eb;     /* Borders and dividers */
    --gray-300: #d1d5db;     /* Disabled elements */
    --gray-400: #9ca3af;     /* Placeholders */
    --gray-500: #6b7280;     /* Secondary text */
    --gray-600: #4b5563;     /* Body text */
    --gray-700: #374151;     /* Headings */
    --gray-800: #1f2937;     /* Dark text */
    --gray-900: #111827;     /* Darkest text */
    
    /* 
     * Glassmorphism Values
     * Modern glass effect for UI panels
     */
    --glass-bg: rgba(255, 255, 255, 0.95);     /* Semi-transparent background */
    --glass-border: rgba(255, 255, 255, 0.18); /* Glass border effect */
    --glass-shadow: 0 8px 32px 0 rgba(31, 38, 135, 0.37); /* Glass shadow */
    
    /* 
     * Typography
     * Font system for consistent text rendering
     */
    --font-primary: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', sans-serif;
    --font-display: 'Inter Display', -apple-system, BlinkMacSystemFont, 'Segoe UI', sans-serif;
    
    /* 
     * Spacing Scale
     * Consistent spacing system based on rem units
     */
    --space-xs: 0.25rem;   /* 4px */
    --space-sm: 0.5rem;    /* 8px */
    --space-md: 1rem;      /* 16px */
    --space-lg: 1.5rem;    /* 24px */
    --space-xl: 2rem;      /* 32px */
    --space-2xl: 3rem;     /* 48px */
    --space-3xl: 4rem;     /* 64px */
    
    /* 
     * Border Radius
     * Consistent border radius for rounded elements
     */
    --radius-sm: 0.375rem;  /* Small elements */
    --radius-md: 0.5rem;    /* Medium elements */
    --radius-lg: 0.75rem;   /* Large elements */
    --radius-xl: 1rem;      /* Extra large elements */
    --radius-2xl: 1.5rem;   /* Cards and panels */
    --radius-3xl: 2rem;      /* Special elements */
    
    /* 
     * Shadow System
     * Depth and elevation for UI elements
     */
    --shadow-sm: 0 1px 2px 0 rgba(0, 0, 0, 0.05);
    --shadow-md: 0 4px 6px -1px rgba(0, 0, 0, 0.1), 0 2px 4px -1px rgba(0, 0, 0, 0.06);
    --shadow-lg: 0 10px 15px -3px rgba(0, 0, 0, 0.1), 0 4px 6px -2px rgba(0, 0, 0, 0.05);
    --shadow-xl: 0 20px 25px -5px rgba(0, 0, 0, 0.1), 0 10px 10px -5px rgba(0, 0, 0, 0.04);
    --shadow-2xl: 0 25px 50px -12px rgba(0, 0, 0, 0.25);
    --shadow-glow: 0 0 20px rgba(102, 126, 234, 0.3); /* Glow effect */
    
    /* 
     * Transitions
     * Consistent timing functions for animations
     */
    --transition-fast: 150ms cubic-bezier(0.4, 0, 0.2, 1);
    --transition-normal: 300ms cubic-bezier(0.4, 0, 0.2, 1);
    --transition-slow: 500ms cubic-bezier(0.4, 0, 0.2, 1);
}

/* ==========================================================================
   GLOBAL STYLES & RESET
   ========================================================================== */

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

body {
    font-family: var(--font-primary);
    background: var(--primary-gradient);
    min-height: 100vh;
    color: var(--gray-800);
    line-height: 1.6;
    position: relative;
    overflow-x: hidden;
}

/* ==========================================================================
   ANIMATED BACKGROUND
   ========================================================================== */

/* 
 * Animated gradient background overlay
 * Creates depth with multiple radial gradients
 */
body::before {
    content: '';
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: 
        radial-gradient(circle at 20% 80%, rgba(102, 126, 234, 0.1) 0%, transparent 50%),
        radial-gradient(circle at 80% 20%, rgba(118, 75, 162, 0.1) 0%, transparent 50%),
        radial-gradient(circle at 40% 40%, rgba(79, 172, 254, 0.05) 0%, transparent 50%);
    pointer-events: none;
    z-index: -1;
}

.container {
    max-width: 1600px;
    margin: 0 auto;
    padding: var(--space-xl);
    position: relative;
    z-index: 1;
}

/* ==========================================================================
   HEADER SECTION
   ========================================================================== */

/* 
 * Premium header with glassmorphism effect
 * Features gradient text and animated glow
 */
header {
    text-align: center;
    color: var(--white);
    margin-bottom: var(--space-3xl);
    position: relative;
    animation: fadeInDown 1s ease-out;
}

/* 
 * Header glow effect overlay
 * Creates subtle radial gradient behind header
 */
header::before {
    content: '';
    position: absolute;
    top: -50%;
    left: 50%;
    transform: translateX(-50%);
    width: 200%;
    height: 200%;
    background: radial-gradient(circle, rgba(255, 255, 255, 0.1) 0%, transparent 70%);
    pointer-events: none;
}

/* 
 * Main heading with gradient text effect
 * Uses clamp for responsive typography
 */
header h1 {
    font-family: var(--font-display);
    font-size: clamp(2.5rem, 5vw, 4rem);
    font-weight: 800;
    margin-bottom: var(--space-md);
    background: linear-gradient(135deg, #ffffff 0%, #e0e7ff 100%);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
    text-shadow: 0 0 40px rgba(255, 255, 255, 0.3);
    position: relative;
    z-index: 1;
}

/* 
 * Header subtitle with responsive sizing
 */
header p {
    font-size: clamp(1rem, 2vw, 1.25rem);
    opacity: 0.95;
    font-weight: 400;
    letter-spacing: 0.025em;
    position: relative;
    z-index: 1;
}

/* ==========================================================================
   MAIN LAYOUT
   ========================================================================== */

.main-content {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: var(--space-2xl);
    align-items: start;
}

/* ==========================================================================
   EDITOR PANEL
   ========================================================================== */

/* 
 * Glassmorphism panel for form inputs
 * Features backdrop blur and glass effects
 */
.editor-panel {
    background: var(--glass-bg);
    backdrop-filter: blur(20px);
    border: 1px solid var(--glass-border);
    border-radius: var(--radius-3xl);
    box-shadow: var(--glass-shadow);
    overflow: hidden;
    position: relative;
}

/* ==========================================================================
   TAB NAVIGATION
   ========================================================================== */

/* 
 * Tab navigation container
 * Gradient background with bottom border
 */
.tabs {
    display: flex;
    background: linear-gradient(135deg, var(--gray-50) 0%, var(--gray-100) 100%);
    border-bottom: 1px solid var(--gray-200);
}

/* 
 * Individual tab buttons with shimmer effect
 * Features gradient overlay on hover
 */
.tab {
    flex: 1;
    padding: var(--space-lg) var(--space-md);
    border: none;
    background: transparent;
    cursor: pointer;
    font-weight: 600;
    color: var(--gray-600);
    transition: all var(--transition-normal);
    position: relative;
    overflow: hidden;
}

.tab::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background: var(--accent-gradient);
    opacity: 0;
    transition: opacity var(--transition-normal);
    border-radius: var(--radius-md) var(--radius-md) 0 0;
}

.tab:hover {
    background: rgba(102, 126, 234, 0.05);
    color: var(--primary);
    transform: translateY(-1px);
}

.tab.active {
    background: var(--white);
    color: var(--primary);
    border-bottom-color: var(--primary);
    font-weight: 700;
    box-shadow: 0 2px 8px rgba(102, 126, 234, 0.2);
}

.tab.active::before {
    opacity: 0.1;
}

/* Tab Content */
.tab-content {
    padding: var(--space-2xl);
    background: var(--white);
    min-height: 500px;
}

.tab-panel {
    display: none;
    animation: fadeIn 0.5s ease-out;
}

.tab-panel.active {
    display: block;
}

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

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

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

/* Premium Typography */
.tab-panel h2 {
    color: var(--gray-900);
    margin-bottom: var(--space-xl);
    font-size: 1.5rem;
    font-weight: 700;
    position: relative;
    padding-left: var(--space-lg);
}

.tab-panel h2::before {
    content: '';
    position: absolute;
    left: 0;
    top: 50%;
    transform: translateY(-50%);
    width: 4px;
    height: 24px;
    background: var(--primary-gradient);
    border-radius: var(--radius-sm);
}

/* Form Elements */
.form-group {
    margin-bottom: var(--space-lg);
    position: relative;
}

.form-group label {
    display: block;
    margin-bottom: var(--space-sm);
    font-weight: 600;
    color: var(--gray-700);
    font-size: 0.875rem;
    text-transform: uppercase;
    letter-spacing: 0.025em;
}

.form-group input,
.form-group textarea {
    width: 100%;
    padding: var(--space-lg) var(--space-md);
    border: 2px solid var(--gray-200);
    border-radius: var(--radius-lg);
    font-size: 0.95rem;
    transition: all var(--transition-normal);
    font-family: inherit;
    background: var(--white);
    position: relative;
}

.form-group input:focus,
.form-group textarea:focus {
    outline: none;
    border-color: var(--primary);
    box-shadow: 0 0 0 3px rgba(102, 126, 234, 0.1), var(--shadow-md);
    transform: translateY(-2px);
}

.form-group textarea {
    resize: vertical;
    min-height: 120px;
}

/* Dynamic Items */
.education-item,
.experience-item,
.project-item {
    background: linear-gradient(135deg, var(--gray-50) 0%, var(--white) 100%);
    padding: var(--space-xl);
    border-radius: var(--radius-xl);
    margin-bottom: var(--space-lg);
    position: relative;
    border: 1px solid var(--gray-200);
    transition: all var(--transition-normal);
    animation: slideIn 0.3s ease-out;
}

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

.education-item:hover,
.experience-item:hover,
.project-item:hover {
    box-shadow: var(--shadow-lg);
    transform: translateY(-2px);
    border-color: var(--primary-light);
}

/* Premium Buttons */
.remove-btn {
    position: absolute;
    top: var(--space-md);
    right: var(--space-md);
    background: var(--error);
    color: var(--white);
    border: none;
    padding: var(--space-sm) var(--space-md);
    border-radius: var(--radius-md);
    cursor: pointer;
    font-size: 0.75rem;
    font-weight: 600;
    transition: all var(--transition-normal);
    text-transform: uppercase;
    letter-spacing: 0.025em;
}

.remove-btn:hover {
    background: #dc2626;
    transform: scale(1.05);
    box-shadow: var(--shadow-md);
}

.add-btn {
    background: var(--primary-gradient);
    color: var(--white);
    border: none;
    padding: var(--space-lg) var(--space-xl);
    border-radius: var(--radius-lg);
    cursor: pointer;
    font-weight: 600;
    transition: all var(--transition-normal);
    margin-top: var(--space-lg);
    text-transform: uppercase;
    letter-spacing: 0.025em;
    font-size: 0.875rem;
    position: relative;
    overflow: hidden;
}

.add-btn::before {
    content: '';
    position: absolute;
    top: 0;
    left: -100%;
    width: 100%;
    height: 100%;
    background: linear-gradient(90deg, transparent, rgba(255, 255, 255, 0.2), transparent);
    transition: left 0.5s;
}

.add-btn:hover {
    transform: translateY(-2px);
    box-shadow: var(--shadow-lg), var(--shadow-glow);
}

.add-btn:hover::before {
    left: 100%;
}

/* Skills Input */
.skill-input-group {
    display: flex;
    gap: var(--space-md);
}

.skill-input-group input {
    flex: 1;
}

.skill-input-group button {
    background: var(--accent-gradient);
    color: var(--white);
    border: none;
    padding: var(--space-lg) var(--space-xl);
    border-radius: var(--radius-lg);
    cursor: pointer;
    font-weight: 600;
    transition: all var(--transition-normal);
    text-transform: uppercase;
    letter-spacing: 0.025em;
    font-size: 0.875rem;
}

.skill-input-group button:hover {
    transform: translateY(-2px);
    box-shadow: var(--shadow-md), var(--shadow-glow);
}

/* Skills Display */
.skills-list {
    display: flex;
    flex-wrap: wrap;
    gap: var(--space-md);
    margin-top: var(--space-lg);
}

.skill-tag {
    background: var(--primary-gradient);
    color: var(--white);
    padding: var(--space-sm) var(--space-md);
    border-radius: var(--radius-2xl);
    font-size: 0.875rem;
    display: flex;
    align-items: center;
    gap: var(--space-sm);
    font-weight: 500;
    transition: all var(--transition-normal);
    cursor: default;
    position: relative;
    overflow: hidden;
}

.skill-tag::before {
    content: '';
    position: absolute;
    top: 0;
    left: -100%;
    width: 100%;
    height: 100%;
    background: linear-gradient(90deg, transparent, rgba(255, 255, 255, 0.2), transparent);
    transition: left 0.5s;
}

.skill-tag:hover {
    transform: translateY(-2px) scale(1.05);
    box-shadow: var(--shadow-md);
}

.skill-tag:hover::before {
    left: 100%;
}

.skill-tag .remove-skill {
    cursor: pointer;
    font-weight: bold;
    opacity: 0.8;
    transition: all var(--transition-fast);
    background: rgba(255, 255, 255, 0.2);
    border-radius: 50%;
    width: 20px;
    height: 20px;
    display: flex;
    align-items: center;
    justify-content: center;
}

.skill-tag .remove-skill:hover {
    opacity: 1;
    background: rgba(255, 255, 255, 0.3);
    transform: scale(1.1);
}

/* Preview Panel */
.preview-panel {
    position: sticky;
    top: var(--space-xl);
    max-height: calc(100vh - 6rem);
    overflow: hidden;
    display: flex;
    flex-direction: column;
}

.preview-header {
    background: linear-gradient(135deg, var(--gray-50) 0%, var(--gray-100) 100%);
    padding: var(--space-xl) var(--space-2xl);
    border-bottom: 1px solid var(--gray-200);
    display: flex;
    justify-content: space-between;
    align-items: center;
    backdrop-filter: blur(10px);
}

.preview-header h2 {
    color: var(--gray-900);
    font-size: 1.25rem;
    font-weight: 700;
    margin: 0;
}

.download-btn {
    background: var(--secondary-gradient);
    color: var(--white);
    border: none;
    padding: var(--space-md) var(--space-xl);
    border-radius: var(--radius-lg);
    cursor: pointer;
    font-weight: 600;
    transition: all var(--transition-normal);
    text-transform: uppercase;
    letter-spacing: 0.025em;
    font-size: 0.875rem;
    position: relative;
    overflow: hidden;
}

.download-btn::before {
    content: '';
    position: absolute;
    top: 0;
    left: -100%;
    width: 100%;
    height: 100%;
    background: linear-gradient(90deg, transparent, rgba(255, 255, 255, 0.2), transparent);
    transition: left 0.5s;
}

.download-btn:hover {
    transform: translateY(-2px);
    box-shadow: var(--shadow-lg), var(--shadow-glow);
}

.download-btn:hover::before {
    left: 100%;
}

.resume-preview {
    padding: var(--space-lg);
    overflow-y: auto;
    flex: 1;
    background: var(--white);
}

/* Resume Content */
.resume-content {
    background: var(--white);
    color: var(--gray-800);
    font-family: 'Georgia', serif;
    line-height: 1.6;
    padding: var(--space-md);
}

/* Resume Title */
.resume-title {
    text-align: center;
    margin-bottom: var(--space-xl);
    border-bottom: 3px solid var(--gray-900);
    padding-bottom: var(--space-md);
}

.resume-title h1 {
    font-size: 2.5rem;
    font-weight: 700;
    color: var(--gray-900);
    margin: 0;
    font-family: var(--font-display);
    letter-spacing: 0.2em;
}

/* Personal Details */
.personal-details h2 {
    font-size: 1.5rem;
    font-weight: 700;
    color: var(--gray-900);
    margin-bottom: var(--space-md);
    text-align: center;
    font-family: var(--font-display);
}

.contact-details p {
    margin: var(--space-sm) 0;
    font-size: 1rem;
    color: var(--gray-700);
    text-align: center;
}

/* Academic Table */
.academic-table {
    width: 100%;
    border-collapse: collapse;
    margin-top: var(--space-lg);
    font-size: 0.9rem;
}

.academic-table th,
.academic-table td {
    border: 1px solid var(--gray-300);
    padding: var(--space-sm);
    text-align: left;
}

.academic-table th {
    background: var(--gray-100);
    font-weight: 700;
    color: var(--gray-900);
    text-transform: uppercase;
    font-size: 0.8rem;
    letter-spacing: 0.025em;
}

.academic-table td {
    background: var(--white);
}

.academic-table tr:nth-child(even) td {
    background: var(--gray-50);
}

/* Skills List */
.skills-list {
    list-style: none;
    padding: 0;
    margin: var(--space-lg) 0;
}

.skills-list li {
    background: var(--gray-50);
    border: 1px solid var(--gray-200);
    padding: var(--space-sm) var(--space-md);
    margin-bottom: var(--space-sm);
    border-radius: var(--radius-sm);
    position: relative;
    padding-left: var(--space-xl);
}

.skills-list li::before {
    content: '•';
    position: absolute;
    left: var(--space-md);
    color: var(--primary);
    font-weight: bold;
    font-size: 1.2rem;
    line-height: 1;
}

/* Work Experience */
.work-experience-content p {
    font-size: 1rem;
    color: var(--gray-700);
    margin: var(--space-lg) 0;
    font-style: italic;
}

/* Personal Information Grid */
.personal-info-grid {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: var(--space-md);
    margin-top: var(--space-lg);
}

.info-row {
    display: flex;
    align-items: center;
    padding: var(--space-sm) 0;
    border-bottom: 1px solid var(--gray-200);
}

.info-label {
    font-weight: 600;
    color: var(--gray-900);
    margin-right: var(--space-sm);
    min-width: 120px;
    font-size: 0.9rem;
}

.info-value {
    color: var(--gray-700);
    font-size: 0.9rem;
}

/* Declaration */
.declaration-signature {
    display: flex;
    justify-content: space-between;
    align-items: flex-end;
    margin-top: var(--space-2xl);
    padding-top: var(--space-lg);
    border-top: 1px solid var(--gray-300);
}

.date-place p {
    margin: var(--space-sm) 0;
    font-size: 0.9rem;
    color: var(--gray-700);
}

.signature p {
    font-size: 0.9rem;
    color: var(--gray-700);
    font-style: italic;
}

/* Form Select Styling */
.form-group select {
    width: 100%;
    padding: var(--space-lg) var(--space-md);
    border: 2px solid var(--gray-200);
    border-radius: var(--radius-lg);
    font-size: 0.95rem;
    transition: all var(--transition-normal);
    font-family: inherit;
    background: var(--white);
    position: relative;
}

.form-group select:focus {
    outline: none;
    border-color: var(--primary);
    box-shadow: 0 0 0 3px rgba(102, 126, 234, 0.1), var(--shadow-md);
    transform: translateY(-2px);
}

.resume-header {
    text-align: center;
    margin-bottom: var(--space-2xl);
    padding-bottom: var(--space-xl);
    border-bottom: 3px solid var(--primary);
    position: relative;
}

.resume-header::after {
    content: '';
    position: absolute;
    bottom: -3px;
    left: 50%;
    transform: translateX(-50%);
    width: 100px;
    height: 3px;
    background: var(--secondary-gradient);
}

.resume-header h1 {
    font-size: 2.5rem;
    font-weight: 700;
    color: var(--gray-900);
    margin-bottom: var(--space-sm);
    font-family: var(--font-display);
}

.resume-header p {
    font-size: 1.25rem;
    color: var(--primary);
    margin-bottom: var(--space-lg);
    font-weight: 500;
    font-family: var(--font-primary);
}

.contact-info {
    display: flex;
    justify-content: center;
    flex-wrap: wrap;
    gap: var(--space-lg);
    font-size: 0.9rem;
    color: var(--gray-600);
}

.contact-info span {
    position: relative;
    padding-left: var(--space-lg);
}

.contact-info span::before {
    content: '•';
    position: absolute;
    left: 0;
    color: var(--primary);
}

.resume-section {
    margin-bottom: var(--space-xl);
}

.resume-section h2 {
    font-size: 1.25rem;
    font-weight: 700;
    color: var(--primary);
    margin-bottom: var(--space-lg);
    padding-bottom: var(--space-sm);
    border-bottom: 2px solid var(--primary);
    text-transform: uppercase;
    letter-spacing: 0.05em;
    font-family: var(--font-display);
}

.education-list > div,
.experience-list > div,
.projects-list > div {
    margin-bottom: var(--space-lg);
    padding-bottom: var(--space-lg);
    border-bottom: 1px solid var(--gray-200);
    position: relative;
}

.education-list > div:last-child,
.experience-list > div:last-child,
.projects-list > div:last-child {
    border-bottom: none;
    margin-bottom: 0;
    padding-bottom: 0;
}

.education-list h3,
.experience-list h3,
.projects-list h3 {
    font-weight: 700;
    color: var(--gray-900);
    margin-bottom: var(--space-sm);
    font-size: 1.1rem;
}

.education-list p,
.experience-list p,
.projects-list p {
    color: var(--gray-600);
    margin-bottom: var(--space-sm);
    line-height: 1.5;
}

.experience-list .duration {
    font-size: 0.9rem;
    color: var(--primary);
    font-weight: 600;
    font-style: italic;
}

.skills-preview {
    display: flex;
    flex-wrap: wrap;
    gap: var(--space-sm);
}

.skills-preview span {
    background: linear-gradient(135deg, var(--gray-50) 0%, var(--gray-100) 100%);
    color: var(--gray-700);
    padding: var(--space-sm) var(--space-md);
    border-radius: var(--radius-md);
    font-size: 0.875rem;
    border: 1px solid var(--gray-200);
    font-weight: 500;
    transition: all var(--transition-normal);
}

.skills-preview span:hover {
    background: var(--primary-gradient);
    color: var(--white);
    transform: translateY(-2px);
    box-shadow: var(--shadow-sm);
}

/* Responsive Design */
@media (max-width: 1024px) {
    .main-content {
        grid-template-columns: 1fr;
    }
    
    .preview-panel {
        position: static;
        max-height: none;
    }
    
    .container {
        padding: var(--space-lg);
    }
}

@media (max-width: 768px) {
    .container {
        padding: var(--space-md);
    }
    
    header h1 {
        font-size: 2rem;
    }
    
    .tabs {
        flex-wrap: wrap;
    }
    
    .tab {
        flex: 1 1 calc(50% - 2px);
        min-width: 120px;
        font-size: 0.75rem;
        padding: var(--space-md) var(--space-sm);
    }
    
    .tab-content {
        padding: var(--space-lg);
    }
    
    .preview-header {
        flex-direction: column;
        gap: var(--space-lg);
        text-align: center;
    }
    
    .contact-info {
        flex-direction: column;
        gap: var(--space-sm);
        text-align: center;
    }
    
    .skill-input-group {
        flex-direction: column;
    }
    
    .resume-header h1 {
        font-size: 2rem;
    }
    
    .resume-header p {
        font-size: 1.1rem;
    }
}

@media (max-width: 480px) {
    .container {
        padding: var(--space-sm);
    }
    
    header h1 {
        font-size: 1.5rem;
    }
    
    .tab {
        flex: 1 1 100%;
    }
    
    .tab-panel h2 {
        font-size: 1.25rem;
    }
    
    .education-item,
    .experience-item,
    .project-item {
        padding: var(--space-lg);
    }
    
    .add-btn,
    .skill-input-group button,
    .download-btn {
        padding: var(--space-md) var(--space-lg);
        font-size: 0.75rem;
    }
}

/* Loading Animation */
.loading {
    display: inline-block;
    width: 20px;
    height: 20px;
    border: 3px solid var(--gray-300);
    border-radius: 50%;
    border-top-color: var(--primary);
    animation: spin 1s ease-in-out infinite;
}

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

/* Success Animation */
.success {
    animation: success 0.5s ease-out;
}

@keyframes success {
    0% { transform: scale(0.8); opacity: 0; }
    50% { transform: scale(1.1); }
    100% { transform: scale(1); opacity: 1; }
}

/* Ripple Animation */
@keyframes ripple {
    to {
        transform: scale(4);
        opacity: 0;
    }
}

/* Custom Scrollbar */
::-webkit-scrollbar {
    width: 8px;
}

::-webkit-scrollbar-track {
    background: var(--gray-100);
    border-radius: var(--radius-sm);
}

::-webkit-scrollbar-thumb {
    background: var(--primary-gradient);
    border-radius: var(--radius-sm);
}

::-webkit-scrollbar-thumb:hover {
    background: var(--primary-dark);
}

/* Success Toast */
.toast {
    position: fixed;
    bottom: var(--space-xl);
    right: var(--space-xl);
    background: var(--success);
    color: var(--white);
    padding: var(--space-lg) var(--space-xl);
    border-radius: var(--radius-lg);
    box-shadow: var(--shadow-2xl);
    transform: translateX(400px);
    transition: transform var(--transition-normal);
    z-index: 1000;
    display: flex;
    align-items: center;
    gap: var(--space-md);
    font-weight: 500;
}

.toast.show {
    transform: translateX(0);
}

.toast::before {
    content: '✓';
    display: flex;
    align-items: center;
    justify-content: center;
    width: 24px;
    height: 24px;
    background: rgba(255, 255, 255, 0.2);
    border-radius: 50%;
    font-weight: bold;
}