/* Xennials | AI Automation & Web Development Design System */

:root {
    --primary: #6366f1;
    --primary-hover: #4f46e5;
    --secondary: #8b5cf6;
    --accent: #ec4899;
    --cyan: #06b6d4;
    --dark: #0b0f19;
    --dark-secondary: #131b2e;
    --dark-tertiary: #1e293b;
    --dark-border: #334155;
    --light-text: #f8fafc;
    --muted-text: #94a3b8;
}

/* Theme Presets */
body[data-theme="cyan"] {
    --primary: #06b6d4;
    --primary-hover: #0891b2;
    --secondary: #3b82f6;
    --accent: #10b981;
}

body[data-theme="purple"] {
    --primary: #a855f7;
    --primary-hover: #9333ea;
    --secondary: #ec4899;
    --accent: #f59e0b;
}

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

html {
    scroll-behavior: smooth;
}

body {
    font-family: 'Inter', sans-serif;
    background-color: var(--dark);
    color: var(--light-text);
    overflow-x: hidden;
    line-height: 1.6;
}

h1, h2, h3, h4, h5, h6, .font-space {
    font-family: 'Space Grotesk', sans-serif;
}

/* Custom Scrollbar */
::-webkit-scrollbar {
    width: 8px;
}
::-webkit-scrollbar-track {
    background: var(--dark);
}
::-webkit-scrollbar-thumb {
    background: var(--dark-tertiary);
    border-radius: 4px;
}
::-webkit-scrollbar-thumb:hover {
    background: var(--secondary);
}

/* Glassmorphism & Cards */
.glass-gradient {
    background: linear-gradient(135deg, rgba(99, 102, 241, 0.08) 0%, rgba(139, 92, 246, 0.08) 100%);
}

.glass-panel {
    background: rgba(19, 27, 46, 0.65);
    backdrop-filter: blur(16px);
    -webkit-backdrop-filter: blur(16px);
    border: 1px solid rgba(255, 255, 255, 0.08);
}

.glass-nav {
    background: rgba(11, 15, 25, 0.85);
    backdrop-filter: blur(20px);
    -webkit-backdrop-filter: blur(20px);
}

/* Neon & Gradients */
.gradient-text {
    background: linear-gradient(135deg, #818cf8 0%, #c084fc 50%, #f472b6 100%);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

.gradient-text-cyan {
    background: linear-gradient(135deg, #38bdf8 0%, #818cf8 100%);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

.neon-glow {
    box-shadow: 0 0 25px rgba(99, 102, 241, 0.35);
}

.gradient-border {
    position: relative;
    border-radius: 1rem;
    background: linear-gradient(var(--dark-secondary), var(--dark-secondary)) padding-box,
                linear-gradient(135deg, var(--primary), var(--accent)) border-box;
    border: 1px solid transparent;
}

/* Hover & Animation Effects */
.service-card {
    transition: all 0.35s cubic-bezier(0.4, 0, 0.2, 1);
}

.service-card:hover {
    transform: translateY(-8px);
    border-color: rgba(139, 92, 246, 0.5);
    box-shadow: 0 20px 35px -10px rgba(139, 92, 246, 0.25);
}

.repo-card {
    transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
    background-color: var(--dark-secondary);
}

.repo-card:hover {
    transform: translateY(-5px) scale(1.01);
    border-color: var(--primary);
    box-shadow: 0 15px 30px -10px rgba(99, 102, 241, 0.3);
}

.tech-glow {
    transition: all 0.3s ease;
}

.tech-glow:hover {
    transform: scale(1.2);
    filter: drop-shadow(0 0 12px rgba(236, 72, 153, 0.6));
}

/* Animations */
.animate-float {
    animation: float 6s ease-in-out infinite;
}

@keyframes float {
    0% { transform: translateY(0px) rotate(0deg); }
    50% { transform: translateY(-16px) rotate(1deg); }
    100% { transform: translateY(0px) rotate(0deg); }
}

.reveal-on-scroll {
    opacity: 0;
    transform: translateY(30px);
    transition: opacity 0.8s cubic-bezier(0.16, 1, 0.3, 1), transform 0.8s cubic-bezier(0.16, 1, 0.3, 1);
}

.reveal-on-scroll.is-visible {
    opacity: 1;
    transform: translateY(0);
}

/* Project Filter Tabs */
.filter-btn.active {
    background: linear-gradient(135deg, var(--primary), var(--secondary));
    color: #ffffff;
    box-shadow: 0 0 15px rgba(99, 102, 241, 0.4);
}

/* Hero Canvas Background */
#hero-canvas {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    pointer-events: none;
    z-index: 1;
}

/* Range Slider Customization */
input[type=range] {
    -webkit-appearance: none;
    background: #1e293b;
    height: 8px;
    border-radius: 4px;
    outline: none;
}

input[type=range]::-webkit-slider-thumb {
    -webkit-appearance: none;
    appearance: none;
    width: 20px;
    height: 20px;
    border-radius: 50%;
    background: linear-gradient(135deg, var(--primary), var(--accent));
    cursor: pointer;
    box-shadow: 0 0 10px rgba(99, 102, 241, 0.6);
    transition: transform 0.2s ease;
}

input[type=range]::-webkit-slider-thumb:hover {
    transform: scale(1.2);
}

/* Modal Window */
.modal-overlay {
    position: fixed;
    top: 0;
    left: 0;
    width: 100vw;
    height: 100vh;
    background: rgba(11, 15, 25, 0.85);
    backdrop-filter: blur(12px);
    z-index: 999;
    display: flex;
    align-items: center;
    justify-content: center;
    opacity: 0;
    pointer-events: none;
    transition: opacity 0.3s ease;
}

.modal-overlay.active {
    opacity: 1;
    pointer-events: auto;
}

.modal-container {
    background: #131b2e;
    border: 1px solid rgba(255, 255, 255, 0.1);
    border-radius: 1.25rem;
    max-width: 650px;
    width: 90%;
    max-height: 85vh;
    overflow-y: auto;
    box-shadow: 0 25px 50px -12px rgba(0, 0, 0, 0.7);
    transform: scale(0.9);
    transition: transform 0.3s cubic-bezier(0.175, 0.885, 0.32, 1.275);
}

.modal-overlay.active .modal-container {
    transform: scale(1);
}

/* Toast Notifications */
#toast {
    position: fixed;
    bottom: 2rem;
    right: 2rem;
    z-index: 9999;
    padding: 1rem 1.5rem;
    border-radius: 0.75rem;
    background: rgba(19, 27, 46, 0.95);
    border: 1px solid var(--secondary);
    box-shadow: 0 10px 30px rgba(0, 0, 0, 0.5);
    color: white;
    font-weight: 500;
    display: flex;
    align-items: center;
    gap: 0.75rem;
    transform: translateY(120%);
    opacity: 0;
    transition: transform 0.4s cubic-bezier(0.175, 0.885, 0.32, 1.275), opacity 0.4s ease;
}

#toast.show {
    transform: translateY(0);
    opacity: 1;
}

/* Back To Top Button */
#back-to-top {
    position: fixed;
    bottom: 2rem;
    left: 2rem;
    z-index: 90;
    width: 3rem;
    height: 3rem;
    border-radius: 9999px;
    background: rgba(30, 41, 59, 0.8);
    backdrop-filter: blur(8px);
    border: 1px solid var(--dark-border);
    color: white;
    display: flex;
    align-items: center;
    justify-content: center;
    cursor: pointer;
    opacity: 0;
    pointer-events: none;
    transition: all 0.3s ease;
}

#back-to-top.visible {
    opacity: 1;
    pointer-events: auto;
}

#back-to-top:hover {
    background: var(--primary);
    transform: translateY(-3px);
    box-shadow: 0 0 15px rgba(99, 102, 241, 0.5);
}