/* =========================================
   JEE RANK BOOSTER - MODERN ENHANCEMENTS CSS
   Version: 1.0
   Apply this file for instant visual improvements
   ========================================= */

/* === 1. CSS VARIABLES & MODERN THEME === */
:root {
    /* Modern Gradients */
    --gradient-primary: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    --gradient-vibrant: linear-gradient(135deg, #f093fb 0%, #f5576c 100%);
    --gradient-success: linear-gradient(135deg, #4facfe 0%, #00f2fe 100%);
    --gradient-warning: linear-gradient(135deg, #fa709a 0%, #fee140 100%);
    
    /* Shadows */
    --shadow-sm: 0 2px 8px rgba(0,0,0,0.08);
    --shadow-md: 0 4px 16px rgba(0,0,0,0.12);
    --shadow-lg: 0 8px 32px rgba(0,0,0,0.16);
    --shadow-xl: 0 16px 48px rgba(0,0,0,0.20);
    
    /* Colors */
    --primary: #667eea;
    --secondary: #764ba2;
    --success: #4caf50;
    --error: #f44336;
    --warning: #ff9800;
    --info: #2196f3;
}

/* === 2. MODERN TYPOGRAPHY === */
@import url('https://fonts.googleapis.com/css2?family=Inter:wght@300;400;500;600;700;800&family=Poppins:wght@400;500;600;700;800&display=swap');

body {
    font-family: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', sans-serif;
    font-weight: 400;
    line-height: 1.6;
    letter-spacing: -0.01em;
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
    text-rendering: optimizeLegibility;
}

h1, h2, h3, h4, h5, h6 {
    font-family: 'Poppins', sans-serif;
    font-weight: 700;
    letter-spacing: -0.02em;
    line-height: 1.2;
}

/* === 3. SMOOTH TRANSITIONS === */
*, *::before, *::after {
    transition-property: background-color, transform, box-shadow, color, border-color, opacity;
    transition-duration: 0.3s;
    transition-timing-function: cubic-bezier(0.4, 0, 0.2, 1);
}

/* === 4. ENHANCED BUTTONS === */
.btn {
    position: relative;
    overflow: hidden;
    transform: translateY(0);
    box-shadow: var(--shadow-md);
    border: none;
    cursor: pointer;
    font-weight: 600;
    letter-spacing: 0.02em;
}

.btn::before {
    content: '';
    position: absolute;
    top: 50%;
    left: 50%;
    width: 0;
    height: 0;
    border-radius: 50%;
    background: rgba(255, 255, 255, 0.3);
    transform: translate(-50%, -50%);
    transition: width 0.6s, height 0.6s;
}

.btn:hover {
    transform: translateY(-2px);
    box-shadow: 0 10px 25px rgba(102, 126, 234, 0.4);
}

.btn:hover::before {
    width: 300px;
    height: 300px;
}

.btn:active {
    transform: translateY(0);
}

.btn-primary {
    background: var(--gradient-primary);
    color: white;
}

.btn-secondary {
    background: var(--gradient-vibrant);
    color: white;
}

.btn-success {
    background: var(--gradient-success);
    color: white;
}

/* === 5. CARD ANIMATIONS === */
.test-card,
.feature-card,
.stat-card,
.card {
    box-shadow: var(--shadow-md);
    transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
    border-radius: 15px;
}

.test-card:hover,
.feature-card:hover,
.stat-card:hover,
.card:hover {
    transform: translateY(-8px) scale(1.02);
    box-shadow: 0 20px 40px rgba(102, 126, 234, 0.3);
}

/* === 6. GLASS MORPHISM EFFECTS === */
.glass {
    background: rgba(255, 255, 255, 0.1);
    backdrop-filter: blur(10px);
    -webkit-backdrop-filter: blur(10px);
    border: 1px solid rgba(255, 255, 255, 0.2);
    box-shadow: 0 8px 32px rgba(0, 0, 0, 0.1);
}

.glass-dark {
    background: rgba(0, 0, 0, 0.1);
    backdrop-filter: blur(10px);
    -webkit-backdrop-filter: blur(10px);
    border: 1px solid rgba(255, 255, 255, 0.1);
}

/* === 7. LOADING STATES === */
.loading-overlay {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: rgba(255, 255, 255, 0.95);
    backdrop-filter: blur(5px);
    display: none;
    align-items: center;
    justify-content: center;
    z-index: 9999;
}

.loading-overlay.active {
    display: flex;
}

.spinner {
    width: 50px;
    height: 50px;
    border: 4px solid #f0f0f0;
    border-top-color: var(--primary);
    border-radius: 50%;
    animation: spin 0.8s linear infinite;
}

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

/* Small spinner for buttons */
.btn-spinner {
    width: 16px;
    height: 16px;
    border: 2px solid rgba(255, 255, 255, 0.3);
    border-top-color: white;
    border-radius: 50%;
    animation: spin 0.6s linear infinite;
    display: inline-block;
    vertical-align: middle;
    margin-left: 8px;
}

/* === 8. SKELETON LOADING === */
.skeleton {
    background: linear-gradient(90deg, #f0f0f0 25%, #e0e0e0 50%, #f0f0f0 75%);
    background-size: 200% 100%;
    animation: skeleton-loading 1.5s ease-in-out infinite;
    border-radius: 8px;
}

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

.skeleton-text {
    height: 16px;
    margin-bottom: 8px;
    width: 100%;
}

.skeleton-title {
    height: 24px;
    width: 60%;
    margin-bottom: 16px;
}

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

.skeleton-circle {
    width: 60px;
    height: 60px;
    border-radius: 50%;
}

.skeleton-button {
    height: 40px;
    width: 120px;
    border-radius: 8px;
}

/* === 9. TOAST NOTIFICATIONS === */
.toast-container {
    position: fixed;
    top: 20px;
    right: 20px;
    z-index: 10000;
    pointer-events: none;
}

.toast {
    min-width: 300px;
    max-width: 500px;
    background: white;
    border-radius: 12px;
    padding: 16px 20px;
    margin-bottom: 12px;
    box-shadow: 0 8px 32px rgba(0, 0, 0, 0.15);
    display: flex;
    align-items: center;
    gap: 12px;
    animation: slideInRight 0.3s cubic-bezier(0.4, 0, 0.2, 1);
    pointer-events: all;
}

.toast.success {
    border-left: 4px solid var(--success);
}

.toast.error {
    border-left: 4px solid var(--error);
}

.toast.warning {
    border-left: 4px solid var(--warning);
}

.toast.info {
    border-left: 4px solid var(--info);
}

.toast-icon {
    font-size: 20px;
    line-height: 1;
}

.toast-message {
    flex: 1;
    font-size: 14px;
}

.toast-close {
    background: none;
    border: none;
    font-size: 20px;
    cursor: pointer;
    color: #999;
    padding: 0;
    width: 24px;
    height: 24px;
    display: flex;
    align-items: center;
    justify-content: center;
    border-radius: 50%;
}

.toast-close:hover {
    background: #f0f0f0;
}

.toast.removing {
    animation: slideOutRight 0.3s cubic-bezier(0.4, 0, 0.2, 1) forwards;
}

@keyframes slideInRight {
    from {
        transform: translateX(400px);
        opacity: 0;
    }
    to {
        transform: translateX(0);
        opacity: 1;
    }
}

@keyframes slideOutRight {
    to {
        transform: translateX(400px);
        opacity: 0;
    }
}

/* === 10. PROGRESS INDICATORS === */
.progress-bar {
    height: 8px;
    background: #e0e0e0;
    border-radius: 10px;
    overflow: hidden;
    position: relative;
}

.progress-fill {
    height: 100%;
    background: var(--gradient-primary);
    border-radius: 10px;
    transition: width 0.3s cubic-bezier(0.4, 0, 0.2, 1);
    box-shadow: 0 0 20px rgba(102, 126, 234, 0.5);
    position: relative;
}

.progress-fill::after {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    bottom: 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%); }
}

/* === 11. MOBILE NAVIGATION === */
@media (max-width: 768px) {
    .nav-menu {
        position: fixed;
        top: 0;
        right: -100%;
        width: 80%;
        max-width: 350px;
        height: 100vh;
        background: rgba(255, 255, 255, 0.98);
        backdrop-filter: blur(20px);
        padding: 80px 30px 30px;
        flex-direction: column;
        transition: right 0.4s cubic-bezier(0.4, 0, 0.2, 1);
        box-shadow: -10px 0 40px rgba(0, 0, 0, 0.2);
        z-index: 1001;
        overflow-y: auto;
    }
    
    .nav-menu.active {
        right: 0;
    }
    
    .nav-menu li {
        margin: 0;
        width: 100%;
    }
    
    .nav-menu a {
        display: block;
        padding: 15px 20px;
        border-radius: 8px;
        margin-bottom: 5px;
    }
    
    .nav-menu a:hover {
        background: rgba(102, 126, 234, 0.1);
    }
    
    .mobile-menu-overlay {
        position: fixed;
        top: 0;
        left: 0;
        width: 100%;
        height: 100vh;
        background: rgba(0, 0, 0, 0.5);
        backdrop-filter: blur(3px);
        display: none;
        z-index: 1000;
        animation: fadeIn 0.3s;
    }
    
    .mobile-menu-overlay.active {
        display: block;
    }
    
    @keyframes fadeIn {
        from { opacity: 0; }
        to { opacity: 1; }
    }
}

/* === 12. SMOOTH SCROLLING === */
html {
    scroll-behavior: smooth;
}

/* === 13. BETTER FOCUS STATES === */
button:focus,
input:focus,
select:focus,
textarea:focus {
    outline: 3px solid rgba(102, 126, 234, 0.3);
    outline-offset: 2px;
}

/* === 14. BADGE STYLES === */
.badge {
    display: inline-block;
    padding: 4px 12px;
    border-radius: 20px;
    font-size: 12px;
    font-weight: 600;
    letter-spacing: 0.5px;
}

.badge-success {
    background: var(--gradient-success);
    color: white;
}

.badge-error {
    background: var(--gradient-vibrant);
    color: white;
}

.badge-warning {
    background: var(--gradient-warning);
    color: white;
}

.badge-info {
    background: rgba(102, 126, 234, 0.1);
    color: var(--primary);
}

/* === 15. HOVER GLOW EFFECTS === */
.glow-on-hover:hover {
    box-shadow: 0 0 20px rgba(102, 126, 234, 0.6),
                0 0 40px rgba(102, 126, 234, 0.4),
                0 0 60px rgba(102, 126, 234, 0.2);
}

/* === 16. PULSE ANIMATION === */
@keyframes pulse {
    0%, 100% { transform: scale(1); }
    50% { transform: scale(1.05); }
}

.pulse {
    animation: pulse 2s infinite;
}

/* === 17. FADE IN ANIMATIONS === */
.fade-in {
    animation: fadeIn 0.5s ease-in;
}

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

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

/* === 18. FLIP CARD EFFECT === */
.flip-card {
    perspective: 1000px;
}

.flip-card-inner {
    position: relative;
    width: 100%;
    height: 100%;
    transition: transform 0.6s;
    transform-style: preserve-3d;
}

.flip-card:hover .flip-card-inner {
    transform: rotateY(180deg);
}

.flip-card-front, .flip-card-back {
    position: absolute;
    width: 100%;
    height: 100%;
    backface-visibility: hidden;
}

.flip-card-back {
    transform: rotateY(180deg);
}

/* === 19. TOOLTIP === */
[data-tooltip] {
    position: relative;
    cursor: help;
}

[data-tooltip]::after {
    content: attr(data-tooltip);
    position: absolute;
    bottom: 100%;
    left: 50%;
    transform: translateX(-50%) translateY(-8px);
    padding: 8px 12px;
    background: rgba(0, 0, 0, 0.9);
    color: white;
    font-size: 12px;
    white-space: nowrap;
    border-radius: 6px;
    opacity: 0;
    pointer-events: none;
    transition: opacity 0.3s, transform 0.3s;
}

[data-tooltip]:hover::after {
    opacity: 1;
    transform: translateX(-50%) translateY(-12px);
}

/* === 20. RESPONSIVE UTILITIES === */
@media (max-width: 640px) {
    .hide-mobile { display: none !important; }
}

@media (min-width: 641px) and (max-width: 1024px) {
    .hide-tablet { display: none !important; }
}

@media (min-width: 1025px) {
    .hide-desktop { display: none !important; }
}

/* === END OF ENHANCEMENTS === */