@import url('https://fonts.googleapis.com/css2?family=Inter:wght@300;400;500;600;700;800;900&display=swap');

/* ==================== CSS Variables ==================== */
:root {
    /* Colors */
    --primary: #6366f1;
    --secondary: #8b5cf6;
    --accent: #06b6d4;
    --bg-color: #fafbfc;
    --text-color: #0f172a;
    --card-bg: rgba(255, 255, 255, 0.8);
    --nav-bg: rgba(255, 255, 255, 0.95);
    --footer-bg: rgba(255, 255, 255, 0.9);
    --border-color: rgba(226, 232, 240, 0.8);
    --glass-bg: rgba(255, 255, 255, 0.1);
    --glass-border: rgba(255, 255, 255, 0.2);
    --shadow-light: rgba(99, 102, 241, 0.1);
    --shadow-medium: rgba(99, 102, 241, 0.2);
    
    /* 3D & Animation */
    --perspective: 1000px;
    --transition-speed: 0.4s;
    --transition-timing: cubic-bezier(0.4, 0, 0.2, 1);
}

.dark {
    --primary: #818cf8;
    --secondary: #a78bfa;
    --accent: #22d3ee;
    --bg-color: #0a0e1a;
    --text-color: #f1f5f9;
    --card-bg: rgba(30, 41, 59, 0.8);
    --nav-bg: rgba(15, 23, 42, 0.95);
    --footer-bg: rgba(15, 23, 42, 0.9);
    --border-color: rgba(51, 65, 85, 0.8);
    --glass-bg: rgba(30, 41, 59, 0.1);
    --glass-border: rgba(148, 163, 184, 0.1);
    --shadow-light: rgba(129, 140, 248, 0.1);
    --shadow-medium: rgba(129, 140, 248, 0.2);
}

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

html {
    scroll-behavior: smooth;
}

body {
    font-family: 'Inter', sans-serif;
    background: var(--bg-color);
    color: var(--text-color);
    transition: background var(--transition-speed) var(--transition-timing),
                color var(--transition-speed) var(--transition-timing);
    overflow-x: hidden;
    position: relative;
}

/* ==================== 3D Canvas Background ==================== */
#three-canvas {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    z-index: -1;
    pointer-events: none;
}

/* Background gradient overlay */
body::before {
    content: '';
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background:
        radial-gradient(circle at 20% 80%, rgba(99, 102, 241, 0.1) 0%, transparent 50%),
        radial-gradient(circle at 80% 20%, rgba(139, 92, 246, 0.1) 0%, transparent 50%),
        radial-gradient(circle at 40% 40%, rgba(6, 182, 212, 0.05) 0%, transparent 50%);
    pointer-events: none;
    z-index: -1;
}

/* ==================== Custom Cursor ==================== */
.custom-cursor {
    width: 20px;
    height: 20px;
    border: 2px solid var(--primary);
    border-radius: 50%;
    position: fixed;
    pointer-events: none;
    z-index: 9999;
    transition: transform 0.2s ease, opacity 0.2s ease;
    opacity: 0;
}

.custom-cursor.active {
    opacity: 1;
}

.custom-cursor.hover {
    transform: scale(1.5);
    background: var(--primary);
    opacity: 0.3;
}

.cursor-follower {
    width: 8px;
    height: 8px;
    background: var(--primary);
    border-radius: 50%;
    position: fixed;
    pointer-events: none;
    z-index: 9998;
    transition: transform 0.15s ease;
    opacity: 0;
}

.cursor-follower.active {
    opacity: 0.8;
}

/* ==================== Loading Screen ==================== */
.loading-screen {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: var(--bg-color);
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    z-index: 10000;
    transition: opacity 0.5s ease, visibility 0.5s ease;
}

.loading-screen.hidden {
    opacity: 0;
    visibility: hidden;
}

.loading-logo {
    font-size: 3rem;
    font-weight: 900;
    background: linear-gradient(135deg, var(--primary), var(--secondary), var(--accent));
    -webkit-background-clip: text;
    background-clip: text;
    color: transparent;
    animation: pulse 2s ease-in-out infinite;
}

.loading-spinner {
    width: 50px;
    height: 50px;
    border: 3px solid var(--glass-border);
    border-top-color: var(--primary);
    border-radius: 50%;
    animation: spin 1s linear infinite;
    margin-top: 20px;
}

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

@keyframes pulse {
    0%, 100% { opacity: 1; transform: scale(1); }
    50% { opacity: 0.7; transform: scale(1.05); }
}

/* ==================== Typography ==================== */
.gradient-text {
    background: linear-gradient(135deg, var(--primary), var(--secondary), var(--accent));
    -webkit-background-clip: text;
    background-clip: text;
    color: transparent;
    background-size: 200% 200%;
    animation: gradientShift 3s ease-in-out infinite;
}

@keyframes gradientShift {
    0%, 100% { background-position: 0% 50%; }
    50% { background-position: 100% 50%; }
}

/* ==================== Glass Morphism ==================== */
.glass-card {
    background: var(--glass-bg);
    backdrop-filter: blur(20px);
    -webkit-backdrop-filter: blur(20px);
    border: 1px solid var(--glass-border);
    box-shadow: 0 8px 32px rgba(0, 0, 0, 0.1);
    transition: all var(--transition-speed) var(--transition-timing);
}

.glass-card:hover {
    transform: translateY(-5px);
    box-shadow: 0 12px 40px var(--shadow-medium);
}

/* ==================== Navigation ==================== */
header {
    position: sticky;
    top: 0;
    z-index: 1000;
    padding: 1.5rem 2.5rem;
    background: var(--nav-bg);
    backdrop-filter: blur(20px);
    -webkit-backdrop-filter: blur(20px);
    border-bottom: 1px solid var(--glass-border);
}

.nav-link {
    position: relative;
    padding: 0.5rem 1rem;
    border-radius: 0.5rem;
    transition: all 0.3s ease;
    text-decoration: none;
    display: inline-block;
}

.nav-link::before {
    content: '';
    position: absolute;
    inset: 0;
    background: var(--glass-bg);
    border-radius: 0.5rem;
    opacity: 0;
    transition: opacity 0.3s ease;
}

.nav-link::after {
    content: '';
    position: absolute;
    width: 0;
    height: 2px;
    bottom: 2px;
    left: 50%;
    transform: translateX(-50%);
    background: linear-gradient(90deg, var(--primary), var(--secondary));
    transition: width 0.3s ease;
}

.nav-link:hover::before {
    opacity: 1;
}

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

/* ==================== Theme Toggle ==================== */
.theme-toggle {
    width: 2.5rem;
    height: 2.5rem;
    border-radius: 50%;
    background: var(--glass-bg);
    backdrop-filter: blur(10px);
    -webkit-backdrop-filter: blur(10px);
    border: 1px solid var(--glass-border);
    display: flex;
    align-items: center;
    justify-content: center;
    cursor: pointer;
    transition: all var(--transition-speed) var(--transition-timing);
}

.theme-toggle:hover {
    transform: rotate(180deg) scale(1.1);
    box-shadow: 0 8px 25px var(--shadow-light);
}

/* ==================== Hero Section ==================== */
.profile-container {
    position: relative;
    background: linear-gradient(135deg, var(--primary), var(--secondary));
    animation: pulse-glow 4s ease-in-out infinite;
    perspective: var(--perspective);
    transform-style: preserve-3d;
}

.profile-container::before {
    content: '';
    position: absolute;
    inset: -2px;
    background: linear-gradient(135deg, var(--primary), var(--secondary), var(--accent));
    border-radius: inherit;
    z-index: -1;
    animation: gradientShift 3s ease-in-out infinite;
}

.profile-container:hover {
    transform: scale(1.05) rotateY(10deg);
}

#profile-img {
    transition: all 0.5s var(--transition-timing);
}

.gsoc-badge {
    background: linear-gradient(135deg, #ff6b35, #f7931e);
    color: white;
    padding: 0.5rem 1rem;
    border-radius: 25px;
    font-weight: 600;
    font-size: 0.875rem;
    box-shadow: 0 4px 15px rgba(255, 107, 53, 0.3);
    animation: float 3s ease-in-out infinite;
    display: inline-block;
}

@keyframes float {
    0%, 100% { transform: translateY(0px) rotate(0deg); }
    33% { transform: translateY(-20px) rotate(5deg); }
    66% { transform: translateY(-10px) rotate(-5deg); }
}

@keyframes pulse-glow {
    0%, 100% { box-shadow: 0 0 20px var(--shadow-light); }
    50% { box-shadow: 0 0 40px var(--shadow-medium); }
}

/* ==================== Skill Badges ==================== */
.skill-badge {
    transition: all var(--transition-speed) var(--transition-timing);
    background: var(--glass-bg);
    backdrop-filter: blur(10px);
    -webkit-backdrop-filter: blur(10px);
    border: 1px solid var(--glass-border);
    position: relative;
    overflow: hidden;
    perspective: var(--perspective);
    transform-style: preserve-3d;
}

.skill-badge::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-badge:hover {
    transform: translateY(-8px) scale(1.05) rotateX(5deg);
    box-shadow: 0 20px 40px var(--shadow-medium);
    border-color: var(--primary);
}

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

/* ==================== Project Cards ==================== */
.project-card {
    transition: all 0.5s var(--transition-timing);
    background: var(--glass-bg);
    backdrop-filter: blur(20px);
    -webkit-backdrop-filter: blur(20px);
    border: 1px solid var(--glass-border);
    position: relative;
    overflow: hidden;
    perspective: var(--perspective);
    transform-style: preserve-3d;
}

.project-card::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    height: 3px;
    background: linear-gradient(90deg, var(--primary), var(--secondary), var(--accent));
    transform: scaleX(0);
    transition: transform 0.3s ease;
}

.project-card:hover {
    transform: translateY(-12px) rotateX(5deg);
    box-shadow: 0 25px 50px var(--shadow-medium);
}

.project-card:hover::before {
    transform: scaleX(1);
}

/* ==================== Buttons ==================== */
.btn-primary {
    background: linear-gradient(135deg, var(--primary), var(--secondary));
    transition: all var(--transition-speed) var(--transition-timing);
    position: relative;
    overflow: hidden;
    border: none;
    cursor: pointer;
}

.btn-primary::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-primary:hover {
    transform: translateY(-3px) scale(1.02);
    box-shadow: 0 15px 35px var(--shadow-medium);
}

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

.btn-outline {
    transition: all var(--transition-speed) var(--transition-timing);
    border: 2px solid var(--primary);
    background: var(--glass-bg);
    backdrop-filter: blur(10px);
    -webkit-backdrop-filter: blur(10px);
    position: relative;
    overflow: hidden;
    cursor: pointer;
}

.btn-outline::before {
    content: '';
    position: absolute;
    inset: 0;
    background: linear-gradient(135deg, var(--primary), var(--secondary));
    opacity: 0;
    transition: opacity 0.3s ease;
}

.btn-outline:hover {
    transform: translateY(-3px) scale(1.02);
    box-shadow: 0 15px 35px var(--shadow-light);
    color: white;
}

.btn-outline:hover::before {
    opacity: 1;
}

.btn-outline span {
    position: relative;
    z-index: 1;
}

/* ==================== Floating Shapes ==================== */
.floating-shapes {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    pointer-events: none;
    z-index: -1;
}

.shape {
    position: absolute;
    opacity: 0.1;
}

.shape-1 {
    top: 10%;
    left: 10%;
    width: 100px;
    height: 100px;
    background: var(--primary);
    border-radius: 50%;
    animation: float 8s ease-in-out infinite;
}

.shape-2 {
    top: 60%;
    right: 10%;
    width: 80px;
    height: 80px;
    background: var(--secondary);
    transform: rotate(45deg);
    animation: float 6s ease-in-out infinite reverse;
}

.shape-3 {
    bottom: 20%;
    left: 20%;
    width: 60px;
    height: 60px;
    background: var(--accent);
    clip-path: polygon(50% 0%, 0% 100%, 100% 100%);
    animation: float 10s ease-in-out infinite;
}

.floating-element {
    animation: float 6s ease-in-out infinite;
}

.floating-element:nth-child(2) {
    animation-delay: -2s;
}

.floating-element:nth-child(3) {
    animation-delay: -4s;
}

/* ==================== Mobile Menu ==================== */
.mobile-menu {
    max-height: 0;
    overflow: hidden;
    transition: all var(--transition-speed) var(--transition-timing);
    background: var(--glass-bg);
    backdrop-filter: blur(20px);
    -webkit-backdrop-filter: blur(20px);
    border: 1px solid var(--glass-border);
    border-radius: 12px;
    margin-top: 8px;
}

.mobile-menu.open {
    max-height: 400px;
}

/* ==================== Responsive Design ==================== */
@media (max-width: 768px) {
    header {
        padding: 1rem 1.5rem;
    }
    
    .loading-logo {
        font-size: 2rem;
    }
    
    .custom-cursor,
    .cursor-follower {
        display: none;
    }
}

/* ==================== Accessibility ==================== */
@media (prefers-reduced-motion: reduce) {
    *,
    *::before,
    *::after {
        animation-duration: 0.01ms !important;
        animation-iteration-count: 1 !important;
        transition-duration: 0.01ms !important;
    }
}

/* Focus styles for keyboard navigation */
a:focus,
button:focus,
input:focus,
textarea:focus {
    outline: 2px solid var(--primary);
    outline-offset: 2px;
}

/* ==================== Utility Classes ==================== */
.gradient-bg {
    background: linear-gradient(135deg, var(--primary), var(--secondary));
}

.text-shadow {
    text-shadow: 0 2px 10px var(--shadow-light);
}

.perspective-container {
    perspective: var(--perspective);
    transform-style: preserve-3d;
}