/* Custom CSS for Personal Website */

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

/* Global Styles */
body {
    font-family: 'Inter', sans-serif;
    line-height: 1.6;
    transition: all 0.2s ease;
}

/* Theme Variables */
:root {
    --primary-color: #667eea;
    --secondary-color: #764ba2;
    --accent-color: #ffc107;
    --text-color: #1a202c;
    --text-muted: #4a5568;
    --bg-color: #f7fafc;
    --card-bg: #ffffff;
    --border-color: #e2e8f0;
    --shadow-color: rgba(0,0,0,0.08);
    --shadow-hover: rgba(0,0,0,0.12);
    --gradient-primary: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    --gradient-dark: linear-gradient(135deg, #0f1419 0%, #1a202c 100%);
    --hero-bg: linear-gradient(135deg, #1a202c 0%, #2d3748 100%);
}

[data-bs-theme="dark"] {
    --primary-color: #8b9dff;
    --secondary-color: #a78bfa;
    --accent-color: #fbbf24;
    --text-color: #f7fafc;
    --text-muted: #a0aec0;
    --bg-color: #0a0e14;
    --card-bg: #1a202c;
    --border-color: #2d3748;
    --shadow-color: rgba(0,0,0,0.3);
    --shadow-hover: rgba(0,0,0,0.4);
    --gradient-primary: linear-gradient(135deg, #8b9dff 0%, #a78bfa 100%);
    --gradient-dark: linear-gradient(135deg, #0a0e14 0%, #1a202c 100%);
    --hero-bg: linear-gradient(135deg, #0a0e14 0%, #1a202c 100%);
}

/* Apply theme colors */
body {
    color: var(--text-color);
    background-color: var(--bg-color);
}

.card {
    background-color: var(--card-bg);
    border-color: var(--border-color);
}

/* Smooth Scrolling */
html {
    scroll-behavior: smooth;
    scroll-padding-top: 80px;
}

/* Enhanced Hero Background */
.hero-section {
    min-height: 100vh;
    display: flex;
    align-items: center;
    position: relative;
    overflow: hidden;
    background: var(--hero-bg);
}

.hero-section::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background: 
        radial-gradient(circle at 20% 80%, rgba(139, 157, 255, 0.15) 0%, transparent 50%),
        radial-gradient(circle at 80% 20%, rgba(167, 139, 250, 0.15) 0%, transparent 50%),
        radial-gradient(circle at 40% 40%, rgba(251, 191, 36, 0.1) 0%, transparent 50%);
    animation: float 20s ease-in-out infinite;
}

.hero-section::after {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background: url('data:image/svg+xml,<svg xmlns="http://www.w3.org/2000/svg" viewBox="0 0 100 100"><defs><pattern id="grain" width="100" height="100" patternUnits="userSpaceOnUse"><circle cx="50" cy="50" r="1" fill="white" opacity="0.03"/></pattern></defs><rect width="100" height="100" fill="url(%23grain)"/></svg>');
    opacity: 0.3;
    animation: grain 8s steps(10) infinite;
}

@keyframes float {
    0%, 100% { transform: translateY(0px) rotate(0deg); }
    33% { transform: translateY(-20px) rotate(1deg); }
    66% { transform: translateY(10px) rotate(-1deg); }
}

@keyframes grain {
    0%, 100% { transform: translate(0, 0); }
    10% { transform: translate(-5%, -5%); }
    20% { transform: translate(-10%, 5%); }
    30% { transform: translate(5%, -10%); }
    40% { transform: translate(-5%, 15%); }
    50% { transform: translate(-10%, 5%); }
    60% { transform: translate(15%, 0%); }
    70% { transform: translate(0%, 10%); }
    80% { transform: translate(-15%, 0%); }
    90% { transform: translate(10%, 5%); }
}

.hero-image {
    animation: float 6s ease-in-out infinite;
    position: relative;
    z-index: 2;
}

/* Enhanced Skill Cards */
.skill-card {
    background: var(--card-bg);
    border-radius: 20px;
    box-shadow: 0 8px 32px var(--shadow-color);
    transition: all 0.3s ease;
    border: 1px solid var(--border-color);
    position: relative;
    overflow: hidden;
    backdrop-filter: blur(10px);
}

.skill-card::before {
    content: '';
    position: absolute;
    top: 0;
    left: -100%;
    width: 100%;
    height: 100%;
    background: linear-gradient(90deg, transparent, rgba(255,255,255,0.1), transparent);
    transition: left 0.6s;
}

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

.skill-card:hover {
    transform: translateY(-8px);
    box-shadow: 0 20px 40px var(--shadow-hover);
}

.skill-card i {
    transition: all 0.3s ease;
}

.skill-card:hover i {
    transform: scale(1.1);
}

/* Enhanced Tech Items */
.tech-item {
    padding: 2.5rem 1.5rem;
    transition: all 0.3s ease;
    border-radius: 16px;
    background: var(--card-bg);
    border: 1px solid var(--border-color);
    box-shadow: 0 4px 20px var(--shadow-color);
}

.tech-item:hover {
    transform: translateY(-5px) scale(1.02);
    box-shadow: 0 12px 30px var(--shadow-hover);
    border-color: var(--primary-color);
}

.tech-item i {
    transition: all 0.4s ease;
}

.tech-item:hover i {
    transform: rotate(360deg) scale(1.2);
}

/* Enhanced Project Cards */
.project-card {
    border: none;
    border-radius: 20px;
    overflow: hidden;
    transition: all 0.3s ease;
    background: var(--card-bg);
    box-shadow: 0 8px 32px var(--shadow-color);
    backdrop-filter: blur(10px);
}

.project-card:hover {
    transform: translateY(-10px);
    box-shadow: 0 25px 50px var(--shadow-hover);
}

.project-card .card-img-top {
    height: 220px;
    object-fit: cover;
    transition: all 0.4s ease;
}

.project-card:hover .card-img-top {
    transform: scale(1.08);
}

.project-card .card-body {
    padding: 1.5rem;
}

.project-card .card-title {
    font-weight: 700;
    color: var(--text-color);
    margin-bottom: 0.75rem;
}

.project-card .card-text {
    color: var(--text-muted);
    line-height: 1.6;
}

/* Enhanced Navigation */
.navbar {
    backdrop-filter: blur(20px);
    background-color: rgba(26, 32, 44, 0.95) !important;
    transition: all 0.3s ease;
    border-bottom: 1px solid var(--border-color);
}

.navbar-brand {
    font-weight: 800;
    font-size: 1.6rem;
    background: var(--gradient-primary);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

.nav-link {
    font-weight: 600;
    transition: all 0.3s ease;
    position: relative;
    padding: 0.5rem 1rem !important;
}

.nav-link::after {
    content: '';
    position: absolute;
    bottom: 0;
    left: 50%;
    width: 0;
    height: 2px;
    background: var(--accent-color);
    transition: all 0.3s ease;
    transform: translateX(-50%);
}

.nav-link:hover::after {
    width: 80%;
}

.nav-link:hover {
    color: var(--accent-color) !important;
    transform: translateY(-2px);
}

/* Enhanced Theme Toggle Button */
#themeToggle {
    transition: all 0.2s ease;
    border-radius: 50%;
    width: 45px;
    height: 45px;
    display: flex;
    align-items: center;
    justify-content: center;
    background: var(--card-bg);
    border: 2px solid var(--border-color);
    color: var(--text-color);
}

#themeToggle:hover {
    transform: scale(1.1) rotate(180deg);
    background: var(--primary-color);
    color: white;
    border-color: var(--primary-color);
}

#themeToggle:active {
    transform: scale(0.95);
}

/* Enhanced Buttons */
.btn {
    border-radius: 12px;
    font-weight: 600;
    transition: all 0.3s ease;
    padding: 0.75rem 1.5rem;
    position: relative;
    overflow: hidden;
}

.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;
}

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

.btn:hover {
    transform: translateY(-3px);
    box-shadow: 0 10px 25px var(--shadow-hover);
}

.btn-warning {
    background: var(--accent-color);
    border-color: var(--accent-color);
    color: #1a202c;
}

.btn-warning:hover {
    background: #f59e0b;
    border-color: #f59e0b;
    color: #1a202c;
}

/* Enhanced Footer */
footer {
    margin-top: auto;
    background: var(--gradient-dark) !important;
    color: var(--text-color) !important;
    border-top: 1px solid var(--border-color);
}

.social-links a {
    transition: all 0.3s ease;
    display: inline-block;
    padding: 0.5rem;
    border-radius: 50%;
    background: var(--card-bg);
    margin: 0 0.25rem;
}

.social-links a:hover {
    transform: translateY(-5px) scale(1.1);
    color: var(--accent-color) !important;
    background: var(--primary-color);
}

/* Enhanced Empty State */
.empty-state {
    padding: 4rem 0;
    text-align: center;
}

.empty-state i {
    opacity: 0.3;
    margin-bottom: 1rem;
}

/* Section Spacing and Typography */
section {
    padding: 100px 0;
}

.display-4 {
    font-weight: 800;
    line-height: 1.2;
}

.display-5 {
    font-weight: 700;
    line-height: 1.3;
}

.lead {
    font-weight: 500;
    color: var(--text-muted);
}

/* Enhanced Responsive Design */
@media (max-width: 768px) {
    .hero-section {
        min-height: 80vh;
        text-align: center;
        padding: 2rem 0;
    }
    
    .display-4 {
        font-size: 2.5rem;
    }
    
    .hero-image {
        margin-top: 2rem;
    }
    
    .skill-card {
        margin-bottom: 1.5rem;
    }
    
    .tech-item {
        margin-bottom: 1rem;
    }
    
    html {
        scroll-padding-top: 60px;
    }
    
    .navbar-brand {
        font-size: 1.4rem;
    }
}

/* Enhanced Loading Animation */
.loading {
    display: inline-block;
    width: 20px;
    height: 20px;
    border: 3px solid rgba(255,255,255,.3);
    border-radius: 50%;
    border-top-color: #fff;
    animation: spin 1s ease-in-out infinite;
}

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

/* Enhanced Custom Scrollbar */
::-webkit-scrollbar {
    width: 10px;
}

::-webkit-scrollbar-track {
    background: var(--bg-color);
}

::-webkit-scrollbar-thumb {
    background: var(--primary-color);
    border-radius: 5px;
}

::-webkit-scrollbar-thumb:hover {
    background: var(--secondary-color);
}

/* Enhanced Text Selection */
::selection {
    background: var(--primary-color);
    color: white;
}

/* Enhanced Focus States */
.btn:focus,
.nav-link:focus {
    box-shadow: 0 0 0 0.2rem rgba(102, 126, 234, 0.25);
}

/* Enhanced Card Hover Effects */
.card {
    transition: all 0.3s ease;
}

.card:hover {
    transform: translateY(-3px);
}

/* Enhanced Image Optimization */
img {
    max-width: 100%;
    height: auto;
}

/* Enhanced Accessibility */
@media (prefers-reduced-motion: reduce) {
    * {
        animation-duration: 0.01ms !important;
        animation-iteration-count: 1 !important;
        transition-duration: 0.01ms !important;
    }
    
    html {
        scroll-behavior: auto;
    }
}

/* Enhanced Dark Theme Specific Styles */
[data-bs-theme="dark"] .bg-light {
    background-color: var(--card-bg) !important;
}

[data-bs-theme="dark"] .text-muted {
    color: var(--text-muted) !important;
}

[data-bs-theme="dark"] .navbar {
    background-color: rgba(10, 14, 20, 0.95) !important;
}

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

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

/* Enhanced Section Headers */
.section-header {
    text-align: center;
    margin-bottom: 4rem;
}

.section-header h2 {
    font-weight: 800;
    margin-bottom: 1rem;
    background: var(--gradient-primary);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

.section-header .lead {
    font-size: 1.1rem;
    max-width: 600px;
    margin: 0 auto;
}

/* Enhanced Gradient Text */
.gradient-text {
    background: var(--gradient-primary);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}