/* ========================================
   CSS Variables & Theme System
   ======================================== */

:root {
    /* Shared */
    --font-mono: 'JetBrains Mono', 'Fira Code', 'Cascadia Code', monospace;
    --font-sans: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', sans-serif;
    --radius: 12px;
    --radius-sm: 8px;
    --transition: 0.3s cubic-bezier(0.4, 0, 0.2, 1);
    --transition-slow: 0.6s cubic-bezier(0.4, 0, 0.2, 1);
}

[data-theme="dark"] {
    --bg-primary: #0a0a0f;
    --bg-secondary: #12121a;
    --bg-card: rgba(18, 18, 26, 0.7);
    --bg-card-hover: rgba(26, 26, 40, 0.9);
    --bg-glass: rgba(255, 255, 255, 0.03);
    --bg-glass-hover: rgba(255, 255, 255, 0.06);

    --text-primary: #e8e8ed;
    --text-secondary: #8888a0;
    --text-muted: #55556a;

    --accent: #6c63ff;
    --accent-glow: rgba(108, 99, 255, 0.3);
    --accent-soft: rgba(108, 99, 255, 0.1);
    --accent-secondary: #00d4aa;
    --accent-secondary-glow: rgba(0, 212, 170, 0.2);

    --border: rgba(255, 255, 255, 0.06);
    --border-hover: rgba(255, 255, 255, 0.12);

    --dot-red: #ff5f57;
    --dot-yellow: #febc2e;
    --dot-green: #28c840;

    --shadow: 0 8px 32px rgba(0, 0, 0, 0.4);
    --shadow-glow: 0 0 60px rgba(108, 99, 255, 0.15);

    --grid-color: rgba(255, 255, 255, 0.02);
    --glow-1: rgba(108, 99, 255, 0.08);
    --glow-2: rgba(0, 212, 170, 0.06);
    --glow-3: rgba(255, 107, 107, 0.04);

    --tag-bg: rgba(108, 99, 255, 0.1);
    --tag-border: rgba(108, 99, 255, 0.25);
    --tag-text: #a09bff;
}

[data-theme="light"] {
    --bg-primary: #f5f5fa;
    --bg-secondary: #ffffff;
    --bg-card: rgba(255, 255, 255, 0.8);
    --bg-card-hover: rgba(255, 255, 255, 0.95);
    --bg-glass: rgba(0, 0, 0, 0.02);
    --bg-glass-hover: rgba(0, 0, 0, 0.04);

    --text-primary: #1a1a2e;
    --text-secondary: #6a6a85;
    --text-muted: #9a9ab0;

    --accent: #5a52e0;
    --accent-glow: rgba(90, 82, 224, 0.2);
    --accent-soft: rgba(90, 82, 224, 0.08);
    --accent-secondary: #00b894;
    --accent-secondary-glow: rgba(0, 184, 148, 0.15);

    --border: rgba(0, 0, 0, 0.08);
    --border-hover: rgba(0, 0, 0, 0.15);

    --dot-red: #ff5f57;
    --dot-yellow: #febc2e;
    --dot-green: #28c840;

    --shadow: 0 8px 32px rgba(0, 0, 0, 0.08);
    --shadow-glow: 0 0 60px rgba(90, 82, 224, 0.08);

    --grid-color: rgba(0, 0, 0, 0.03);
    --glow-1: rgba(90, 82, 224, 0.06);
    --glow-2: rgba(0, 184, 148, 0.05);
    --glow-3: rgba(255, 107, 107, 0.04);

    --tag-bg: rgba(90, 82, 224, 0.08);
    --tag-border: rgba(90, 82, 224, 0.2);
    --tag-text: #5a52e0;
}

/* ========================================
   Reset & Base
   ======================================== */

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

html {
    scroll-behavior: smooth;
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
}

body {
    font-family: var(--font-sans);
    background-color: var(--bg-primary);
    color: var(--text-primary);
    min-height: 100vh;
    display: flex;
    align-items: center;
    justify-content: center;
    overflow-x: hidden;
    transition: background-color var(--transition), color var(--transition);
    position: relative;
}

/* ========================================
   Animated Background
   ======================================== */

.bg-grid {
    position: fixed;
    inset: 0;
    background-image:
        linear-gradient(var(--grid-color) 1px, transparent 1px),
        linear-gradient(90deg, var(--grid-color) 1px, transparent 1px);
    background-size: 60px 60px;
    z-index: 0;
    pointer-events: none;
    animation: gridMove 20s linear infinite;
}

@keyframes gridMove {
    0% { transform: translate(0, 0); }
    100% { transform: translate(60px, 60px); }
}

.bg-glow {
    position: fixed;
    border-radius: 50%;
    filter: blur(100px);
    z-index: 0;
    pointer-events: none;
    animation: glowFloat 8s ease-in-out infinite;
}

.bg-glow-1 {
    width: 500px;
    height: 500px;
    background: var(--glow-1);
    top: -10%;
    left: -5%;
    animation-delay: 0s;
}

.bg-glow-2 {
    width: 400px;
    height: 400px;
    background: var(--glow-2);
    bottom: -10%;
    right: -5%;
    animation-delay: -3s;
}

.bg-glow-3 {
    width: 300px;
    height: 300px;
    background: var(--glow-3);
    top: 50%;
    left: 50%;
    transform: translate(-50%, -50%);
    animation-delay: -5s;
}

@keyframes glowFloat {
    0%, 100% { transform: translate(0, 0) scale(1); opacity: 0.6; }
    33% { transform: translate(30px, -20px) scale(1.1); opacity: 1; }
    66% { transform: translate(-20px, 30px) scale(0.9); opacity: 0.8; }
}

/* Particles */
.particles {
    position: fixed;
    inset: 0;
    z-index: 0;
    pointer-events: none;
    overflow: hidden;
}

.particle {
    position: absolute;
    font-family: var(--font-mono);
    font-size: 12px;
    color: var(--accent);
    opacity: 0.12;
    animation: particleFloat linear infinite;
    white-space: nowrap;
}

@keyframes particleFloat {
    0% {
        transform: translateY(100vh) rotate(0deg);
        opacity: 0;
    }
    10% {
        opacity: 0.12;
    }
    90% {
        opacity: 0.12;
    }
    100% {
        transform: translateY(-100px) rotate(360deg);
        opacity: 0;
    }
}

/* ========================================
   Theme Toggle
   ======================================== */

.theme-toggle {
    position: fixed;
    top: 24px;
    right: 24px;
    z-index: 100;
    width: 48px;
    height: 48px;
    border-radius: 50%;
    border: 1px solid var(--border);
    background: var(--bg-card);
    backdrop-filter: blur(20px);
    -webkit-backdrop-filter: blur(20px);
    color: var(--text-primary);
    cursor: pointer;
    display: flex;
    align-items: center;
    justify-content: center;
    transition: all var(--transition);
    box-shadow: var(--shadow);
}

.theme-toggle:hover {
    border-color: var(--accent);
    background: var(--bg-card-hover);
    transform: rotate(180deg) scale(1.05);
    box-shadow: var(--shadow-glow);
}

[data-theme="dark"] .icon-sun { display: block; }
[data-theme="dark"] .icon-moon { display: none; }
[data-theme="light"] .icon-sun { display: none; }
[data-theme="light"] .icon-moon { display: block; }

/* ========================================
   Container
   ======================================== */

.container {
    position: relative;
    z-index: 1;
    width: 100%;
    max-width: 720px;
    padding: 48px 24px;
    margin: 0 auto;
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 48px;
    animation: fadeInUp 0.8s ease-out;
}

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

/* ========================================
   Terminal Header
   ======================================== */

.terminal-header {
    display: flex;
    align-items: center;
    gap: 16px;
    padding: 12px 20px;
    background: var(--bg-card);
    border: 1px solid var(--border);
    border-radius: var(--radius);
    backdrop-filter: blur(20px);
    -webkit-backdrop-filter: blur(20px);
    width: 100%;
    max-width: 420px;
    box-shadow: var(--shadow);
    animation: fadeInUp 0.8s ease-out 0.2s both;
}

.terminal-dots {
    display: flex;
    gap: 6px;
}

.dot {
    width: 10px;
    height: 10px;
    border-radius: 50%;
}

.dot-red { background: var(--dot-red); }
.dot-yellow { background: var(--dot-yellow); }
.dot-green { background: var(--dot-green); }

.terminal-title {
    font-family: var(--font-mono);
    font-size: 13px;
    color: var(--text-secondary);
    letter-spacing: 0.5px;
}

/* ========================================
   Hero Section
   ======================================== */

.hero {
    text-align: center;
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 24px;
    animation: fadeInUp 0.8s ease-out 0.4s both;
}

.code-badge {
    display: inline-flex;
    align-items: center;
    gap: 8px;
    padding: 6px 16px;
    background: var(--accent-soft);
    border: 1px solid var(--tag-border);
    border-radius: 100px;
    font-family: var(--font-mono);
    font-size: 12px;
    color: var(--tag-text);
    letter-spacing: 0.5px;
    text-transform: uppercase;
}

.badge-dot {
    width: 6px;
    height: 6px;
    border-radius: 50%;
    background: var(--accent-secondary);
    animation: pulse 2s ease-in-out infinite;
}

@keyframes pulse {
    0%, 100% { opacity: 1; box-shadow: 0 0 0 0 var(--accent-secondary-glow); }
    50% { opacity: 0.6; box-shadow: 0 0 0 8px transparent; }
}

.hero h1 {
    font-family: var(--font-sans);
    font-size: clamp(2.2rem, 6vw, 3.8rem);
    font-weight: 700;
    line-height: 1.15;
    letter-spacing: -0.02em;
    position: relative;
}

.hero h1 .greeting {
    display: block;
    font-family: var(--font-mono);
    font-size: clamp(0.85rem, 2vw, 1rem);
    font-weight: 400;
    color: var(--accent);
    letter-spacing: 2px;
    text-transform: uppercase;
    margin-bottom: 8px;
}

/* Glitch effect on hover */
.glitch-text {
    position: relative;
    cursor: default;
}

.glitch-text:hover::before,
.glitch-text:hover::after {
    content: attr(data-text);
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
}

.glitch-text:hover::before {
    color: var(--accent);
    animation: glitch-1 0.3s ease-in-out;
    clip-path: polygon(0 0, 100% 0, 100% 45%, 0 45%);
}

.glitch-text:hover::after {
    color: var(--accent-secondary);
    animation: glitch-2 0.3s ease-in-out;
    clip-path: polygon(0 55%, 100% 55%, 100% 100%, 0 100%);
}

@keyframes glitch-1 {
    0%   { transform: translate(0); }
    20%  { transform: translate(-3px, 3px); }
    40%  { transform: translate(3px, -3px); }
    60%  { transform: translate(-2px, 1px); }
    80%  { transform: translate(2px, -1px); }
    100% { transform: translate(0); }
}

@keyframes glitch-2 {
    0%   { transform: translate(0); }
    20%  { transform: translate(3px, -3px); }
    40%  { transform: translate(-3px, 3px); }
    60%  { transform: translate(2px, -1px); }
    80%  { transform: translate(-2px, 1px); }
    100% { transform: translate(0); }
}

/* Typing Animation */
.typing-wrapper {
    display: flex;
    align-items: center;
    justify-content: center;
    font-family: var(--font-mono);
    font-size: clamp(0.9rem, 2.5vw, 1.1rem);
    color: var(--accent-secondary);
    gap: 2px;
    min-height: 28px;
}

.typing-label {
    color: var(--text-muted);
}

.cursor {
    color: var(--accent);
    animation: blink 1s step-end infinite;
    font-weight: 300;
}

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

.hero-description {
    font-size: clamp(0.95rem, 2.5vw, 1.1rem);
    color: var(--text-secondary);
    line-height: 1.7;
    max-width: 520px;
}

/* Tech Stack Tags */
.tech-stack {
    display: flex;
    flex-wrap: wrap;
    gap: 8px;
    justify-content: center;
    margin-top: 8px;
}

.tech-tag {
    font-family: var(--font-mono);
    font-size: 12px;
    padding: 6px 14px;
    background: var(--tag-bg);
    border: 1px solid var(--tag-border);
    border-radius: 6px;
    color: var(--tag-text);
    letter-spacing: 0.3px;
    transition: all var(--transition);
    cursor: default;
}

.tech-tag:hover {
    background: var(--accent);
    color: white;
    border-color: var(--accent);
    transform: translateY(-2px);
    box-shadow: 0 4px 16px var(--accent-glow);
}

/* ========================================
   Countdown
   ======================================== */

.countdown-section {
    width: 100%;
    text-align: center;
    animation: fadeInUp 0.8s ease-out 0.6s both;
}

.section-label {
    font-family: var(--font-mono);
    font-size: 12px;
    color: var(--text-muted);
    text-transform: uppercase;
    letter-spacing: 2px;
    margin-bottom: 24px;
}

.countdown {
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 12px;
}

.countdown-item {
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 8px;
    padding: 20px 16px;
    background: var(--bg-card);
    border: 1px solid var(--border);
    border-radius: var(--radius);
    backdrop-filter: blur(20px);
    -webkit-backdrop-filter: blur(20px);
    min-width: 80px;
    transition: all var(--transition);
    box-shadow: var(--shadow);
}

.countdown-item:hover {
    border-color: var(--accent);
    box-shadow: var(--shadow-glow);
    transform: translateY(-4px);
}

.countdown-value {
    font-family: var(--font-mono);
    font-size: clamp(1.8rem, 5vw, 2.4rem);
    font-weight: 700;
    color: var(--text-primary);
    line-height: 1;
}

.countdown-label {
    font-family: var(--font-mono);
    font-size: 11px;
    color: var(--text-muted);
    text-transform: uppercase;
    letter-spacing: 1.5px;
}

.countdown-separator {
    font-family: var(--font-mono);
    font-size: 2rem;
    color: var(--accent);
    font-weight: 700;
    animation: blink 1s step-end infinite;
    padding-bottom: 20px;
}

/* ========================================
   Social Links
   ======================================== */

.social-section {
    width: 100%;
    text-align: center;
    animation: fadeInUp 0.8s ease-out 0.8s both;
}

.social-links {
    display: flex;
    justify-content: center;
    gap: 16px;
    flex-wrap: wrap;
}

.social-link {
    display: flex;
    align-items: center;
    gap: 10px;
    padding: 14px 24px;
    background: var(--bg-card);
    border: 1px solid var(--border);
    border-radius: var(--radius);
    backdrop-filter: blur(20px);
    -webkit-backdrop-filter: blur(20px);
    color: var(--text-secondary);
    text-decoration: none;
    font-family: var(--font-mono);
    font-size: 13px;
    letter-spacing: 0.3px;
    transition: all var(--transition);
    box-shadow: var(--shadow);
}

.social-link:hover {
    color: var(--text-primary);
    border-color: var(--accent);
    background: var(--bg-card-hover);
    transform: translateY(-3px);
    box-shadow: var(--shadow-glow);
}

.social-link svg {
    transition: color var(--transition);
}

.social-link:hover svg {
    color: var(--accent);
}

/* ========================================
   Footer
   ======================================== */

.footer {
    text-align: center;
    padding-top: 16px;
    border-top: 1px solid var(--border);
    width: 100%;
    animation: fadeInUp 0.8s ease-out 1s both;
}

.footer-line {
    font-family: var(--font-mono);
    font-size: 12px;
    color: var(--text-muted);
    letter-spacing: 0.3px;
}

.footer-comment {
    color: var(--accent);
    opacity: 0.5;
}

/* ========================================
   Responsive Design
   ======================================== */

/* Tablet */
@media (max-width: 768px) {
    .container {
        padding: 40px 20px;
        gap: 40px;
    }

    .countdown {
        gap: 8px;
    }

    .countdown-item {
        min-width: 65px;
        padding: 16px 12px;
    }

    .countdown-separator {
        font-size: 1.5rem;
    }

    .social-link {
        padding: 12px 18px;
    }

    .bg-glow-1 { width: 300px; height: 300px; }
    .bg-glow-2 { width: 250px; height: 250px; }
    .bg-glow-3 { width: 200px; height: 200px; }
}

/* Mobile */
@media (max-width: 480px) {
    .container {
        padding: 32px 16px;
        gap: 32px;
    }

    .terminal-header {
        max-width: 100%;
        padding: 10px 16px;
    }

    .terminal-title {
        font-size: 11px;
    }

    .countdown {
        gap: 6px;
    }

    .countdown-item {
        min-width: 55px;
        padding: 14px 8px;
    }

    .countdown-separator {
        font-size: 1.2rem;
        padding-bottom: 16px;
    }

    .social-links {
        flex-direction: column;
        align-items: center;
    }

    .social-link {
        width: 100%;
        max-width: 260px;
        justify-content: center;
    }

    .theme-toggle {
        top: 16px;
        right: 16px;
        width: 42px;
        height: 42px;
    }

    .tech-tag {
        font-size: 11px;
        padding: 5px 10px;
    }
}

/* Reduced Motion */
@media (prefers-reduced-motion: reduce) {
    *, *::before, *::after {
        animation-duration: 0.01ms !important;
        animation-iteration-count: 1 !important;
        transition-duration: 0.01ms !important;
    }
    .bg-grid { animation: none; }
}

/* ========================================
   Scrollbar
   ======================================== */

::-webkit-scrollbar {
    width: 6px;
}

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

::-webkit-scrollbar-thumb {
    background: var(--border);
    border-radius: 3px;
}

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

/* ========================================
   Selection
   ======================================== */

::selection {
    background: var(--accent);
    color: white;
}