/* Custom CSS Variables */
:root {
    --primary-500: #3b82f6;
    --primary-600: #2563eb;
    --dark-700: #1f2937;
    --dark-800: #111827;
    --dark-900: #0b0f19;
}

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

html {
    scroll-behavior: smooth;
}

body {
    font-family: 'Poppins', sans-serif;
    background-color: var(--dark-900);
    color: #fff;
    overflow-x: hidden;
}

/* Loading Screen */
#loading-screen {
    background: linear-gradient(135deg, var(--dark-900) 0%, var(--dark-800) 100%);
}

.loader {
    width: 60px;
    height: 60px;
    border: 4px solid var(--dark-700);
    border-top: 4px solid var(--primary-500);
    border-radius: 50%;
    animation: spin 1s linear infinite;
}

@keyframes spin {
    0% { transform: rotate(0deg); }
    100% { transform: rotate(360deg); }
}

/* Navbar Styles */
#navbar {
    background: transparent;
    backdrop-filter: blur(10px);
}

#navbar.scrolled {
    background: rgba(11, 15, 25, 0.95);
    box-shadow: 0 4px 30px rgba(0, 0, 0, 0.3);
}

.nav-link {
    position: relative;
    font-weight: 500;
    transition: color 0.3s ease;
}

.nav-link::after {
    content: '';
    position: absolute;
    bottom: -4px;
    left: 0;
    width: 0;
    height: 2px;
    background: var(--primary-500);
    transition: width 0.3s ease;
}

.nav-link:hover::after,
.nav-link.active::after {
    width: 100%;
}

/* Hero Section */
#hero {
    background: linear-gradient(135deg, var(--dark-900) 0%, var(--dark-800) 50%, var(--dark-900) 100%);
    min-height: 100vh;
    display: flex;
    align-items: center;
    justify-content: center;
    position: relative;
    overflow: hidden;
}

#particles-js {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
}

/* Social Links */
.social-link {
    transition: all 0.3s ease;
}

.social-link:hover {
    transform: translateY(-5px);
}

/* Skill Cards */
.skill-card {
    transition: all 0.3s ease;
    border: 1px solid transparent;
}

.skill-card:hover {
    border-color: var(--primary-500);
    box-shadow: 0 0 20px rgba(59, 130, 246, 0.2);
}

/* Project Cards */
.project-card {
    border: 1px solid var(--dark-700);
    transition: all 0.3s ease;
}

.project-card:hover {
    border-color: var(--primary-500);
    box-shadow: 0 10px 40px rgba(59, 130, 246, 0.15);
}

/* Skill Progress Bars */
.skill-progress {
    width: 0;
    transition: width 1.5s ease-in-out;
}

/* Scroll to Top Button */
#scroll-to-top {
    opacity: 0;
    visibility: hidden;
    transition: all 0.3s ease;
}

#scroll-to-top.visible {
    opacity: 1;
    visibility: visible;
}

/* Filter Buttons */
.filter-btn {
    transition: all 0.3s ease;
}

.filter-btn.active {
    background: var(--primary-500);
    color: white;
}

.filter-btn:hover:not(.active) {
    background: var(--primary-500);
}

/* FAQ Accordion */
.faq-toggle {
    cursor: pointer;
}

.faq-toggle .fa-chevron-down {
    transition: transform 0.3s ease;
}

.faq-toggle.active .fa-chevron-down {
    transform: rotate(180deg);
}

.faq-content {
    max-height: 0;
    overflow: hidden;
    transition: max-height 0.3s ease, padding 0.3s ease;
}

.faq-content.open {
    max-height: 200px;
}

/* Form Styles */
input:focus,
textarea:focus {
    box-shadow: 0 0 0 3px rgba(59, 130, 246, 0.2);
}

/* Animations */
@keyframes fadeInUp {
    from {
        opacity: 0;
        transform: translateY(20px);
    }
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

@keyframes pulse {
    0%, 100% {
        opacity: 1;
    }
    50% {
        opacity: 0.5;
    }
}

.animate-fadeInUp {
    animation: fadeInUp 0.6s ease forwards;
}

.animate-pulse {
    animation: pulse 2s ease-in-out infinite;
}

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

::-webkit-scrollbar-track {
    background: var(--dark-900);
}

::-webkit-scrollbar-thumb {
    background: var(--dark-700);
    border-radius: 4px;
}

::-webkit-scrollbar-thumb:hover {
    background: var(--primary-500);
}

/* Responsive Styles */
@media (max-width: 768px) {
    .hero-title {
        font-size: 2.5rem;
    }
    
    .hero-subtitle {
        font-size: 1.25rem;
    }
    
    #mobile-menu {
        animation: slideDown 0.3s ease;
    }
    
    @keyframes slideDown {
        from {
            opacity: 0;
            transform: translateY(-10px);
        }
        to {
            opacity: 1;
            transform: translateY(0);
        }
    }
}

/* Light Mode Styles (Optional) */
body.light-mode {
    background-color: #f8fafc;
    color: #1e293b;
}

body.light-mode .bg-dark-800,
body.light-mode .bg-dark-900 {
    background-color: #ffffff;
}

body.light-mode .text-white {
    color: #1e293b;
}

body.light-mode .text-gray-400 {
    color: #64748b;
}

/* Particle.js Custom Styles */
#particles-js canvas {
    position: absolute;
    top: 0;
    left: 0;
}

/* Typing Animation */
.typing-text {
    border-right: 2px solid var(--primary-500);
    animation: blink 0.7s infinite;
}

@keyframes blink {
    0%, 50% { border-color: var(--primary-500); }
    51%, 100% { border-color: transparent; }
}

/* Hover Effects */
.hover-lift {
    transition: transform 0.3s ease;
}

.hover-lift:hover {
    transform: translateY(-5px);
}

/* Glass Effect */
.glass {
    background: rgba(255, 255, 255, 0.05);
    backdrop-filter: blur(10px);
    border: 1px solid rgba(255, 255, 255, 0.1);
}

/* Gradient Text */
.gradient-text {
    background: linear-gradient(135deg, var(--primary-500), #8b5cf6);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

/* Button Hover Effects */
.btn-primary {
    position: relative;
    overflow: hidden;
}

.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 ease;
}

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

/* Card Hover Glow */
.card-glow {
    position: relative;
}

.card-glow::before {
    content: '';
    position: absolute;
    inset: -1px;
    background: linear-gradient(45deg, var(--primary-500), #8b5cf6, var(--primary-500));
    border-radius: inherit;
    opacity: 0;
    transition: opacity 0.3s ease;
    z-index: -1;
}

.card-glow:hover::before {
    opacity: 1;
}

/* Timeline Styles */
.timeline-item::before {
    content: '';
    position: absolute;
    left: 50%;
    transform: translateX(-50%);
    width: 20px;
    height: 20px;
    background: var(--primary-500);
    border-radius: 50%;
    border: 4px solid var(--dark-900);
}

/* Contact Form Success Message */
.form-success {
    display: none;
    padding: 1rem;
    background: rgba(34, 197, 94, 0.2);
    border: 1px solid #22c55e;
    border-radius: 0.5rem;
    color: #22c55e;
    margin-top: 1rem;
}

/* Mobile Menu Animation */
#mobile-menu.show {
    display: block;
}

/* Project Filter Animation */
.project-card.hidden {
    display: none;
}

/* Smooth Page Transitions */
.page-transition {
    animation: fadeIn 0.5s ease;
}

@keyframes fadeIn {
    from { opacity: 0; }
    to { opacity: 1; }
}

/* Focus States */
a:focus,
button:focus {
    outline: 2px solid var(--primary-500);
    outline-offset: 2px;
}

/* Selection Color */
::selection {
    background: var(--primary-500);
    color: white;
}