/* ===== CSS VARIABLES ===== */
:root {
    --bg: #fafafa;
    --bg2: #f5f5f5;
    --surface: #ffffff;
    --surface2: #ebebeb;
    --accent: #171717;
    --accent-hover: #000000;
    --accent2: #0070f3;
    --accent3: #7928ca;
    --text: #171717;
    --text-muted: #4d4d4d;
    --border: #ebebeb;
    --glow: 0px 1px 2px rgba(0,0,0,0.05), 0px 2px 4px rgba(0,0,0,0.05);
    --glow2: 0px 2px 4px rgba(0,0,0,0.06), 0px 8px 16px -8px rgba(0,0,0,0.06);
    --nav-h: 64px;

    /* Premium Stacked Shadows */
    --shadow-level-1: 0 0 0 1px rgba(0, 0, 0, 0.08);
    --shadow-level-2: 0px 1px 1px rgba(0,0,0,0.03), 0px 2px 2px rgba(0,0,0,0.03);
    --shadow-level-3: 0px 2px 2px rgba(0,0,0,0.04), 0px 8px 8px -8px rgba(0,0,0,0.04);
    --shadow-level-4: 0px 2px 2px rgba(0,0,0,0.04), 0px 8px 16px -4px rgba(0,0,0,0.04);
    --shadow-level-5: 0px 1px 1px rgba(0,0,0,0.02), 0px 8px 16px -4px rgba(0,0,0,0.04), 0px 24px 32px -8px rgba(0,0,0,0.06);
}

[data-theme="dark"] {
    --bg: #0a0a0a;
    --bg2: #111111;
    --surface: #000000;
    --surface2: #222222;
    --accent: #ffffff;
    --accent-hover: #eaeaea;
    --accent2: #0070f3;
    --accent3: #a855f7;
    --text: #ffffff;
    --text-muted: #888888;
    --border: #333333;
    --glow: 0px 1px 2px rgba(0,0,0,0.4);
    --glow2: 0px 2px 8px rgba(0,0,0,0.4);

    /* Dark Mode Stacked Shadows */
    --shadow-level-1: 0 0 0 1px rgba(255, 255, 255, 0.15);
    --shadow-level-2: 0px 1px 2px rgba(0,0,0,0.5);
    --shadow-level-3: 0px 4px 12px rgba(0,0,0,0.5);
    --shadow-level-4: 0px 8px 24px rgba(0,0,0,0.6);
    --shadow-level-5: 0px 12px 32px rgba(0,0,0,0.7);
}

/* ===== RESET & BASE ===== */
*,
*::before,
*::after {
    box-sizing: border-box;
    margin: 0;
    padding: 0;
}

html {
    scroll-behavior: smooth;
}

body {
    font-family: 'Inter', system-ui, -apple-system, sans-serif;
    font-feature-settings: "ss01", "ss02";
    background: var(--bg);
    color: var(--text);
    overflow-x: hidden;
    transition: background 0.4s, color 0.4s;
}

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

/* ===== CANVAS BG ===== */
#bg-canvas {
    position: fixed;
    inset: 0;
    z-index: 0;
    pointer-events: none;
    opacity: 0.5;
}

/* ===== NAV ===== */
nav {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    height: var(--nav-h);
    z-index: 100;
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: 0 5%;
    background: rgba(255, 255, 255, 0.8);
    backdrop-filter: blur(20px);
    border-bottom: 1px solid var(--border);
    transition: background 0.4s;
}

[data-theme="dark"] nav {
    background: rgba(10, 10, 10, 0.8);
}

.nav-logo {
    font-family: 'Inter', sans-serif;
    font-size: 1.1rem;
    font-weight: 600;
    color: var(--accent);
    text-decoration: none;
    letter-spacing: -0.5px;
}

.nav-logo span {
    color: var(--text-muted);
}

.nav-links {
    display: flex;
    gap: 1.5rem;
    list-style: none;
    align-items: center;
}

.nav-links a {
    color: var(--text-muted);
    text-decoration: none;
    font-size: 14px;
    font-weight: 500;
    padding: 6px 12px;
    border-radius: 100px;
    transition: background-color 0.2s, color 0.2s;
}

.nav-links a:hover,
.nav-links a.active {
    color: var(--text);
    background-color: var(--bg2);
}

.nav-right {
    display: flex;
    align-items: center;
    gap: 1rem;
}

.theme-btn {
    width: 40px;
    height: 40px;
    border-radius: 50%;
    border: 1px solid var(--border);
    background: var(--surface);
    cursor: pointer;
    font-size: 1.1rem;
    display: flex;
    align-items: center;
    justify-content: center;
    transition: all 0.3s;
    color: var(--text);
}

.theme-btn:hover {
    border-color: var(--accent);
    box-shadow: var(--glow);
}

.hamburger {
    display: none;
    flex-direction: column;
    gap: 5px;
    cursor: pointer;
    background: none;
    border: none;
    padding: 5px;
}

.hamburger span {
    width: 24px;
    height: 2px;
    background: var(--text);
    transition: all 0.3s;
    display: block;
}

.mobile-menu {
    display: none;
    position: fixed;
    top: var(--nav-h);
    left: 0;
    right: 0;
    background: var(--bg2);
    border-bottom: 1px solid var(--border);
    padding: 1.5rem 5%;
    z-index: 99;
    flex-direction: column;
    gap: 1.2rem;
}

.mobile-menu.open {
    display: flex;
}

.mobile-menu a {
    color: var(--text-muted);
    text-decoration: none;
    font-size: 1rem;
    font-weight: 600;
    letter-spacing: 0.05em;
    text-transform: uppercase;
    transition: color 0.25s;
}

.mobile-menu a:hover {
    color: var(--accent);
}

/* ===== HERO ===== */
.hero {
    min-height: 100vh;
    display: flex;
    align-items: center;
    justify-content: center;
    position: relative;
    z-index: 1;
    padding: 0 5%;
    padding-top: var(--nav-h);
    text-align: center;
    background: var(--bg);
    overflow: hidden;
}

.hero::before {
    content: "";
    position: absolute;
    top: -10%;
    left: 50%;
    transform: translateX(-50%);
    width: 100%;
    max-width: 1400px;
    height: 90%;
    background-image: 
        radial-gradient(circle at 50% -20%, rgba(80, 227, 194, 0.18) 0%, transparent 50%),
        radial-gradient(circle at 20% 30%, rgba(0, 112, 243, 0.15) 0%, transparent 45%),
        radial-gradient(circle at 80% 25%, rgba(121, 40, 202, 0.15) 0%, transparent 45%),
        radial-gradient(circle at 50% 50%, rgba(255, 0, 128, 0.10) 0%, transparent 50%),
        radial-gradient(circle at 75% 70%, rgba(249, 203, 40, 0.08) 0%, transparent 40%);
    filter: blur(100px);
    opacity: 0.95;
    z-index: -1;
    pointer-events: none;
}

.hero-inner {
    max-width: 900px;
}

.hero-badge {
    display: inline-flex;
    align-items: center;
    gap: 0.5rem;
    font-family: 'JetBrains Mono', monospace;
    font-size: 12px;
    letter-spacing: -0.2px;
    color: var(--text-muted);
    text-transform: none;
    border: 1px solid var(--border);
    padding: 0.35rem 0.85rem;
    border-radius: 100px;
    margin-bottom: 2rem;
    background: var(--bg2);
    animation: fadeUp 0.8s ease both;
}

.hero-badge::before {
    content: '';
    width: 6px;
    height: 6px;
    border-radius: 50%;
    background: #0070f3;
    animation: pulse 2s infinite;
}

.hero h1 {
    font-family: 'Inter', system-ui, -apple-system, sans-serif;
    font-size: clamp(2.8rem, 7vw, 4.5rem);
    font-weight: 600;
    line-height: 1.05;
    letter-spacing: -2.4px;
    margin-bottom: 1.5rem;
    animation: fadeUp 0.8s 0.15s ease both;
    color: var(--text);
}

.hero h1 .line1 {
    display: block;
}

.hero h1 .line2 {
    display: block;
    color: var(--text);
}

.hero-sub {
    font-family: 'Inter', system-ui, -apple-system, sans-serif;
    font-size: clamp(1.05rem, 2.2vw, 1.15rem);
    color: var(--text-muted);
    max-width: 640px;
    margin: 0 auto 3rem;
    line-height: 1.6;
    letter-spacing: -0.2px;
    font-weight: 400;
    animation: fadeUp 0.8s 0.3s ease both;
}

.hero-ctas {
    display: flex;
    gap: 1rem;
    justify-content: center;
    flex-wrap: wrap;
    animation: fadeUp 0.8s 0.45s ease both;
}

.btn-primary {
    padding: 0px 24px;
    height: 48px;
    border-radius: 100px;
    background: var(--accent);
    color: var(--surface);
    font-family: 'Inter', sans-serif;
    font-weight: 500;
    font-size: 15px;
    letter-spacing: -0.2px;
    text-decoration: none;
    border: 1px solid var(--accent);
    cursor: pointer;
    transition: background-color 0.2s, border-color 0.2s, color 0.2s, transform 0.2s;
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: 0.5rem;
}

.btn-primary:hover {
    background: var(--accent-hover);
    border-color: var(--accent-hover);
    transform: translateY(-1px);
}

.btn-secondary {
    padding: 0px 24px;
    height: 48px;
    border-radius: 100px;
    background: var(--surface);
    color: var(--text-muted);
    font-family: 'Inter', sans-serif;
    font-weight: 500;
    font-size: 15px;
    letter-spacing: -0.2px;
    text-decoration: none;
    cursor: pointer;
    border: 1px solid var(--border);
    transition: background-color 0.2s, border-color 0.2s, color 0.2s, transform 0.2s;
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: 0.5rem;
}

.btn-secondary:hover {
    color: var(--text);
    border-color: var(--text);
    background: var(--bg2);
    transform: translateY(-1px);
}

/* scroll indicator */
.scroll-indicator {
    position: absolute;
    bottom: 2.5rem;
    left: 50%;
    transform: translateX(-50%);
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 0.5rem;
    color: var(--text-muted);
    font-family: 'Space Mono', monospace;
    font-size: 0.65rem;
    letter-spacing: 0.1em;
    text-transform: uppercase;
    animation: fadeUp 1s 1s ease both;
}

.scroll-indicator .mouse {
    width: 22px;
    height: 36px;
    border: 2px solid var(--text-muted);
    border-radius: 100px;
    display: flex;
    justify-content: center;
    padding-top: 6px;
}

.scroll-indicator .wheel {
    width: 3px;
    height: 6px;
    background: var(--accent);
    border-radius: 100px;
    animation: scroll-wheel 1.5s infinite;
}

/* ===== INTRO SECTION ===== */
.section {
    padding: 7rem 5%;
    position: relative;
    z-index: 1;
}

.section-label {
    font-family: 'JetBrains Mono', monospace;
    font-size: 12px;
    font-weight: 500;
    line-height: 16px;
    letter-spacing: 0.05em;
    text-transform: uppercase;
    color: var(--accent2);
    margin-bottom: 1rem;
}

.section-title {
    font-family: 'Inter', system-ui, -apple-system, sans-serif;
    font-size: clamp(2rem, 4vw, 2.25rem);
    font-weight: 600;
    letter-spacing: -1.28px;
    margin-bottom: 1.5rem;
    line-height: 1.25;
    color: var(--text);
}

.intro-grid {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 5rem;
    align-items: center;
    max-width: 1100px;
    margin: 0 auto;
}

.intro-text p {
    color: var(--text-muted);
    line-height: 1.7;
    margin-bottom: 1.2rem;
    font-size: 1.05rem;
}

.intro-text strong {
    color: var(--text);
}

.code-block {
    background: #000000;
    border: 1px solid var(--border);
    border-radius: 8px;
    padding: 1.5rem;
    font-family: 'JetBrains Mono', monospace;
    font-size: 0.82rem;
    line-height: 1.8;
    position: relative;
    overflow: hidden;
    color: #ffffff;
    box-shadow: var(--shadow-level-3);
}

[data-theme="dark"] .code-block {
    background: #000000;
    border-color: #222222;
}

.code-block::before {
    content: '● ● ●';
    position: absolute;
    top: 1rem;
    left: 1.2rem;
    color: #333333;
    letter-spacing: 0.4em;
    font-size: 0.7rem;
}

.code-block pre {
    margin-top: 1.8rem;
}

.code-c {
    color: #00dfd8;
}

.code-g {
    color: #ff0080;
}

.code-p {
    color: #7928ca;
}

.code-w {
    color: #ffffff;
}

/* ===== STATS ===== */
.stats-row {
    display: flex;
    gap: 2rem;
    flex-wrap: wrap;
    justify-content: center;
    margin-top: 3rem;
}

.stat-card {
    flex: 1;
    min-width: 160px;
    max-width: 200px;
    background: var(--surface);
    border: 1px solid var(--border);
    border-radius: 8px;
    padding: 1.8rem 1.5rem;
    text-align: center;
    transition: border-color 0.2s, transform 0.2s, box-shadow 0.2s;
    box-shadow: var(--shadow-level-3);
}

.stat-card:hover {
    border-color: var(--accent);
    transform: translateY(-2px);
    box-shadow: var(--shadow-level-4);
}

.stat-num {
    font-family: 'Inter', system-ui, -apple-system, sans-serif;
    font-size: 2.5rem;
    font-weight: 600;
    letter-spacing: -1.28px;
    color: var(--text);
    margin-bottom: 0.3rem;
}

.stat-label {
    font-family: 'JetBrains Mono', monospace;
    font-size: 11px;
    color: var(--text-muted);
    font-weight: 500;
    letter-spacing: -0.2px;
    text-transform: uppercase;
    margin-top: 0.4rem;
}

/* ===== SKILLS STRIP ===== */
.skills-strip {
    padding: 2rem 0;
    overflow: hidden;
    position: relative;
    z-index: 1;
    border-top: 1px solid var(--border);
    border-bottom: 1px solid var(--border);
    background: var(--surface);
}

.skills-track {
    display: flex;
    gap: 3rem;
    width: max-content;
    animation: marquee 20s linear infinite;
}

.skill-tag {
    font-family: 'JetBrains Mono', monospace;
    font-size: 0.8rem;
    white-space: nowrap;
    color: var(--text-muted);
    letter-spacing: -0.2px;
    display: flex;
    align-items: center;
    gap: 0.6rem;
}

.skill-tag::before {
    content: '◆';
    color: var(--accent2);
    font-size: 0.6rem;
}

/* ===== CTA SECTION ===== */
.cta-section {
    padding: 7rem 5%;
    z-index: 1;
    position: relative;
    text-align: center;
}

.cta-card {
    max-width: 800px;
    margin: 0 auto;
    background: var(--surface);
    border: 1px solid var(--border);
    border-radius: 12px;
    padding: 5rem 3rem;
    position: relative;
    overflow: hidden;
    box-shadow: var(--shadow-level-4);
}

.cta-card h2 {
    font-family: 'Inter', system-ui, -apple-system, sans-serif;
    font-size: clamp(2rem, 4vw, 2.5rem);
    font-weight: 600;
    letter-spacing: -1.28px;
    margin-bottom: 1rem;
    line-height: 1.15;
    color: var(--text);
}

.cta-card p {
    color: var(--text-muted);
    margin-bottom: 2.5rem;
    font-size: 1.1rem;
    line-height: 1.6;
}

/* ===== FOOTER ===== */
footer {
    padding: 3rem 5%;
    text-align: center;
    border-top: 1px solid var(--border);
    color: var(--text-muted);
    font-size: 0.85rem;
    position: relative;
    z-index: 1;
    background: var(--surface);
}

footer span {
    color: var(--accent2);
}

/* ===== ANIMATIONS ===== */
@keyframes fadeUp {
    from {
        opacity: 0;
        transform: translateY(30px);
    }

    to {
        opacity: 1;
        transform: translateY(0);
    }
}

@keyframes pulse {

    0%,
    100% {
        opacity: 1;
        transform: scale(1);
    }

    50% {
        opacity: 0.5;
        transform: scale(0.8);
    }
}

@keyframes scroll-wheel {
    0% {
        opacity: 1;
        transform: translateY(0);
    }

    100% {
        opacity: 0;
        transform: translateY(10px);
    }
}

@keyframes marquee {
    from {
        transform: translateX(0);
    }

    to {
        transform: translateX(-50%);
    }
}

.reveal {
    opacity: 0;
    transform: translateY(40px);
    transition: opacity 0.7s ease, transform 0.7s ease;
}

.reveal.visible {
    opacity: 1;
    transform: translateY(0);
}

/* ===== RESPONSIVE ===== */
@media (max-width: 768px) {
    .nav-links {
        display: none;
    }

    .hamburger {
        display: flex;
    }

    .intro-grid {
        grid-template-columns: 1fr;
        gap: 3rem;
    }

    .hero h1 {
        letter-spacing: -1px;
    }
}