:root {
    --bg: #0b1220;
    --bg-soft: #0f172a;
    --text: #e5e7eb;
    --muted: #9ca3af;
    --card: #101826;
    --border: #1f2937;
    --accent: #0ea5e9;
    --accent-2: #22d3ee;
    --shadow: 0 10px 30px rgba(2, 6, 23, 0.5);
}

html[data-theme="light"] {
    --bg: #f8fafc;
    --bg-soft: #ffffffcc;
    --text: #0b1220;
    --muted: #475569;
    --card: #ffffff;
    --border: #e2e8f0;
    --shadow: 0 10px 30px rgba(2, 6, 23, 0.08);
}

* {
    box-sizing: border-box;
    box-shadow: none;
    margin: 0;
    padding: 0;
    font: inherit;
    vertical-align: baseline;
    text-decoration: none;
    
}

html,
body {
    margin: 0;
    padding: 0;
}

body {
    font-family: Inter, system-ui, -apple-system, Segoe UI, Roboto, Arial, sans-serif;
    background: radial-gradient(1200px 600px at 10% -10%, rgba(14, 165, 233, 0.12), transparent),
        radial-gradient(1000px 500px at 90% -20%, rgba(34, 211, 238, 0.1), transparent),
        var(--bg);
    color: var(--text);
    line-height: 1.7;
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
    scroll-behavior: smooth;
}

.skip-link {
    position: absolute;
    left: -999px;
    top: 0;
    background: var(--accent);
    color: #001018;
    padding: 8px 12px;
    border-radius: 6px;
}

.skip-link:focus {
    left: 12px;
    top: 12px;
}

/* Header / Nav */
.site-header {
    position: sticky;
    top: 0;
    z-index: 40;
}

.nav {
    display: flex;
    align-items: center;
    gap: 16px;
    padding: 14px 24px;
    backdrop-filter: blur(10px);
    background: color-mix(in oklab, var(--bg) 75%, transparent);
    border-bottom: 1px solid var(--border);
    max-width: 100VW;
    margin: 0 auto;
}

.nav__brand {
    font-weight: 800;
    letter-spacing: 0.2px;
}

.nav__links {
    list-style: none;
    display: flex;
    gap: 18px;
    margin: 0 auto;
    padding: 0;
}

.nav__links a {
    color: var(--text);
    text-decoration: none;
    font-weight: 500;
    opacity: 0.9;
}

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

.nav__links a {
    position: relative;
}

.nav__links a::after {
    content: "";
    position: absolute;
    left: 0;
    right: 0;
    bottom: -6px;
    height: 2px;
    background: linear-gradient(90deg, var(--accent), var(--accent-2));
    transform: scaleX(0);
    transform-origin: center;
    transition: transform .18s ease;
}

.nav__links a:hover::after {
    transform: scaleX(1);
}

.nav__toggle {
    display: none;
    background: transparent;
    border: 1px solid var(--border);
    color: var(--text);
    padding: 6px 10px;
    border-radius: 8px;
    cursor: pointer;
}

.theme-toggle {
    background: transparent;
    border: 1px solid var(--border);
    color: var(--text);
    padding: 6px 10px;
    border-radius: 8px;
    cursor: pointer;
}

.theme-toggle:hover,
.nav__toggle:hover {
    border-color: var(--accent);
    color: var(--accent);
}

@media (max-width: 768px) {
    .nav {
        flex-wrap: wrap;
    }

    .nav__toggle {
        display: inline-block;
        margin-left: auto;
    }

    .nav__links {
        width: 100%;
        display: none;
        flex-direction: column;
        align-items: center;
        gap: 12px;
        padding-top: 8px;
        margin: 0;
    }

    .nav__links.is-open {
        display: flex;
    }
}

/* Hero */
.hero {
    position: relative;
    isolation: isolate;
    padding: 96px 20px 64px;
}

.hero__bg::before {
    content: "";
    position: absolute;
    inset: -40px -20px auto -20px;
    height: 360px;
    background: radial-gradient(600px 180px at 50% -20%, rgba(14, 165, 233, .25), transparent),
        radial-gradient(500px 150px at 70% -30%, rgba(34, 211, 238, .2), transparent);
    filter: blur(10px);
    max-width: 100vw;
    z-index: -1;
}

.hero__inner {
    max-width: 1100px;
    margin: 0 auto;
    text-align: center;
}

.badge {
    display: inline-block;
    padding: 6px 10px;
    border: 1px solid var(--border);
    border-radius: 999px;
    font-size: 12px;
    color: var(--muted);
    background: color-mix(in oklab, var(--card) 70%, transparent);
}

.hero__title {
    font-size: clamp(32px, 6vw, 56px);
    margin: 16px 0 10px;
    font-weight: 800;
}

.accent {
    background: linear-gradient(90deg, var(--accent), var(--accent-2));
    -webkit-background-clip: text;
    background-clip: text;
    color: transparent;
}

.hero__subtitle {
    max-width: 780px;
    margin: 0 auto;
    color: var(--muted);
}

.hero__ctas {
    margin-top: 26px;
    display: flex;
    justify-content: center;
    gap: 12px;
    flex-wrap: wrap;
}

.btn {
    display: inline-block;
    padding: 12px 18px;
    border-radius: 12px;
    text-decoration: none;
    font-weight: 600;
    border: 1px solid var(--border);
}

.btn {
    cursor: pointer;
}

.btn--primary {
    background: linear-gradient(135deg, var(--accent), var(--accent-2));
    color: #001018;
    border-color: transparent;
    box-shadow: var(--shadow);
}

.btn--primary:hover {
    filter: brightness(1.05);
    transform: translateY(-1px);
}

.btn--ghost {
    color: var(--text);
    background: transparent;
}

.btn--ghost:hover {
    border-color: var(--accent);
    color: var(--accent);
}

/* Sections */
.section {
    max-width: 1100px;
    margin: 0 auto;
    padding: 72px 20px;
}

.section__title {
    text-align: center;
    font-size: clamp(22px, 3.5vw, 32px);
    margin-bottom: 24px;
}

.section__lead {
    max-width: 850px;
    margin: 0 auto;
    color: var(--muted);
    text-align: center;
}

.grid {
    display: grid;
    gap: 22px;
}

.skills-grid {
    grid-template-columns: repeat(auto-fit, minmax(240px, 1fr));
}

.products {
    grid-template-columns: repeat(auto-fit, minmax(260px, 1fr));
}

.card {
    background: color-mix(in oklab, var(--card) 85%, transparent);
    border: 1px solid var(--border);
    border-radius: 14px;
    padding: 18px 18px 16px;
    transition: transform .18s ease, border-color .18s ease, box-shadow .18s ease;
}

.card h3 {
    margin: 0 0 8px;
    color: var(--text);
    font-size: 16px;
}

.card p {
    margin: 0;
    color: var(--muted);
}

.card:hover {
    transform: translateY(-3px);
    border-color: color-mix(in oklab, var(--accent) 40%, var(--border));
    box-shadow: var(--shadow);
}

.product {
    text-align: center;
}

.product__link {
    color: var(--accent);
    font-weight: 700;
    text-decoration: none;
}

.product__link {
    cursor: pointer;
}

.product__link:hover {
    text-decoration: underline;
}

.product__desc {
    color: var(--muted);
    font-size: 14px;
    margin-top: 6px;
}

/* Contact */
.contact {
    text-align: center;
}

.contact a {
    color: var(--text);
    text-underline-offset: 3px;
}

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

.socials {
    display: flex;
    justify-content: center;
    gap: 10px;
    margin-top: 14px;
}

.social {
    display: inline-grid;
    place-items: center;
    width: 38px;
    height: 38px;
    border-radius: 999px;
    border: 1px solid var(--border);
    color: var(--text);
    background: color-mix(in oklab, var(--card) 70%, transparent);
    transition: border-color .18s ease, color .18s ease, transform .18s ease;
    cursor: pointer;
}

.social svg {
    width: 18px;
    height: 18px;
}

.social:hover {
    color: var(--accent);
    border-color: var(--accent);
    transform: translateY(-2px);
}

/* Ensure pointer on links inside cards */
.card a {
    cursor: pointer;
}

/* Footer */
.footer {
    text-align: center;
    color: var(--muted);
    padding: 40px 20px;
    border-top: 1px solid var(--border);
}

/* To Top Button */
.to-top {
    position: fixed;
    right: 16px;
    bottom: 16px;
    width: 42px;
    height: 42px;
    border-radius: 999px;
    border: 1px solid var(--border);
    background: color-mix(in oklab, var(--card) 85%, transparent);
    color: var(--text);
    display: grid;
    place-items: center;
    box-shadow: var(--shadow);
    opacity: 0;
    pointer-events: none;
    transform: translateY(8px);
    transition: opacity .2s ease, transform .2s ease;
}

.to-top.is-visible {
    opacity: 1;
    pointer-events: auto;
    transform: translateY(0);
}

.to-top:hover {
    border-color: var(--accent);
    color: var(--accent);
}

/* Reveal Animations */
.reveal {
    opacity: 0;
    transform: translateY(18px);
    transition: opacity .5s ease, transform .5s ease;
}

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

/* Focus styles */
:focus-visible {
    outline: 2px solid var(--accent);
    outline-offset: 2px;
    border-radius: 6px;
}

/* Reduced motion */
@media (prefers-reduced-motion: reduce) {
    * {
        animation: none !important;
        transition: none !important;
    }
}