:root {
    --bg: #f5f7fb;
    --bg-elevated: rgba(255, 255, 255, 0.78);
    --bg-elevated-strong: rgba(255, 255, 255, 0.94);
    --text: #182230;
    --text-muted: #556274;
    --border: rgba(20, 32, 50, 0.1);
    --shadow: 0 18px 50px rgba(13, 24, 40, 0.08);
    --shadow-hover: 0 24px 70px rgba(13, 24, 40, 0.14);
    --primary: #2457e5;
    --primary-soft: rgba(36, 87, 229, 0.1);
    --secondary: #d61f69;
    --tag-bg: #eef3ff;
    --card-radius: 22px;
    --content-width: 1180px;
    --header-height: 72px;
    --grid-gap: 1.35rem;
    --gradient:
        radial-gradient(circle at top left, rgba(36, 87, 229, 0.16), transparent 30%),
        radial-gradient(circle at 85% 10%, rgba(214, 31, 105, 0.12), transparent 22%),
        linear-gradient(180deg, #f7f9fc 0%, #eef3f9 100%);
}

body[data-theme="dark"] {
    --bg: #0c1220;
    --bg-elevated: rgba(14, 22, 38, 0.82);
    --bg-elevated-strong: rgba(14, 22, 38, 0.94);
    --text: #eef3fb;
    --text-muted: #a4b1c3;
    --border: rgba(255, 255, 255, 0.08);
    --shadow: 0 18px 50px rgba(0, 0, 0, 0.3);
    --shadow-hover: 0 24px 70px rgba(0, 0, 0, 0.42);
    --primary-soft: rgba(80, 120, 255, 0.18);
    --tag-bg: rgba(255, 255, 255, 0.06);
    --gradient:
        radial-gradient(circle at top left, rgba(70, 110, 255, 0.17), transparent 28%),
        radial-gradient(circle at 85% 10%, rgba(214, 31, 105, 0.17), transparent 20%),
        linear-gradient(180deg, #09101c 0%, #0d1524 100%);
}

* {
    box-sizing: border-box;
}

html {
    scroll-behavior: smooth;
}

body {
    margin: 0;
    font-family: Inter, ui-sans-serif, system-ui, -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;
    color: var(--text);
    background: var(--gradient);
    line-height: 1.65;
    min-height: 100vh;
    transition: background 220ms ease, color 220ms ease;
}

img,
video {
    max-width: 100%;
    display: block;
}

a {
    color: inherit;
    text-decoration: none;
}

.container {
    width: min(calc(100% - 2rem), var(--content-width));
    margin: 0 auto;
}

.site-header {
    position: sticky;
    top: 0;
    z-index: 30;
    backdrop-filter: blur(16px);
    background: color-mix(in srgb, var(--bg-elevated-strong) 92%, transparent);
    border-bottom: 1px solid var(--border);
}

.header-inner {
    min-height: var(--header-height);
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: 1rem;
}

.brand {
    display: inline-flex;
    align-items: center;
    gap: 0.8rem;
    font-weight: 800;
    letter-spacing: -0.02em;
}

.brand-mark {
    width: 2.35rem;
    height: 2.35rem;
    border-radius: 16px;
    display: grid;
    place-items: center;
    background: linear-gradient(135deg, var(--primary), var(--secondary));
    color: white;
    box-shadow: var(--shadow);
    font-size: 0.95rem;
}

.nav-links {
    display: flex;
    align-items: center;
    gap: 0.35rem;
    flex-wrap: wrap;
}

.nav-links a,
.theme-toggle {
    padding: 0.68rem 0.9rem;
    border-radius: 999px;
    color: var(--text-muted);
    transition: background 180ms ease, color 180ms ease, transform 180ms ease;
    border: 0;
    background: transparent;
    cursor: pointer;
    font: inherit;
}

.nav-links a:hover,
.nav-links a:focus-visible,
.theme-toggle:hover,
.theme-toggle:focus-visible {
    background: var(--primary-soft);
    color: var(--text);
    outline: none;
    transform: translateY(-1px);
}

main {
    padding-bottom: 5rem;
}

.section-card,
.project-card,
.footer-card {
    background: var(--bg-elevated);
    border: 1px solid var(--border);
    box-shadow: var(--shadow);
    backdrop-filter: blur(16px);
}

.intro-card {
    border-radius: 30px;
    padding: 1.8rem 1.8rem 1.6rem;
    text-align: center;
    max-width: 850px;
    margin: 0 auto;
}

.intro-card h1 {
    margin: 0;
    font-size: clamp(2.2rem, 4vw, 3.8rem);
    line-height: 1;
    letter-spacing: -0.05em;
}

.intro-copy {
    margin: 0.8rem auto 0;
    max-width: 58ch;
    font-size: 1.03rem;
    color: var(--text-muted);
}

.intro-eyebrow {
    margin: 0 0 0.35rem;
    color: var(--primary);
    font-weight: 700;
    letter-spacing: -0.01em;
    font-size: 0.96rem;
}

section {
    padding-top: 2.1rem;
}

.section-heading {
    display: flex;
    align-items: end;
    justify-content: space-between;
    gap: 1rem;
    margin-bottom: 1.2rem;
}

.section-heading h2 {
    margin: 0;
    font-size: clamp(1.7rem, 3vw, 2.5rem);
    line-height: 1.05;
    letter-spacing: -0.03em;
}

.section-heading p {
    margin: 0.4rem 0 0;
    color: var(--text-muted);
    max-width: 58ch;
}

.section-card {
    padding: 1.45rem;
    border-radius: 26px;
}

.about-grid {
    display: grid;
    grid-template-columns: 1.1fr 0.9fr;
    gap: 1.2rem;
}

.about-copy p {
    margin-top: 0;
    color: var(--text-muted);
}

.subheading {
    margin: 0 0 0.8rem;
    letter-spacing: -0.02em;
}

.pill-list {
    display: flex;
    flex-wrap: wrap;
    gap: 0.55rem;
    padding: 0;
    margin: 0;
    list-style: none;
}

.pill-list li,
.tag {
    display: inline-flex;
    align-items: center;
    padding: 0.42rem 0.72rem;
    border-radius: 999px;
    background: var(--tag-bg);
    color: var(--text);
    font-size: 0.84rem;
    border: 1px solid var(--border);
}

.project-toolbar {
    display: flex;
    flex-wrap: wrap;
    align-items: center;
    justify-content: space-between;
    gap: 0.8rem;
    margin-bottom: 1rem;
}

.filter-row {
    display: flex;
    flex-wrap: wrap;
    gap: 0.45rem;
}

.filter-button {
    background: var(--bg-elevated-strong);
    color: var(--text-muted);
    border: 1px solid var(--border);
    border-radius: 999px;
    padding: 0.38rem 0.68rem;
    font: inherit;
    font-size: 0.82rem;
    line-height: 1.2;
    cursor: pointer;
    transition: background 180ms ease, color 180ms ease, transform 180ms ease;
}

.filter-button:hover,
.filter-button:focus-visible,
.filter-button.is-active {
    background: var(--primary-soft);
    color: var(--text);
    outline: none;
    transform: translateY(-1px);
}

.projects-grid {
    display: grid;
    grid-template-columns: repeat(3, minmax(0, 1fr));
    gap: var(--grid-gap);
}

.project-card {
    position: relative;
    overflow: hidden;
    border-radius: var(--card-radius);
    transition: transform 200ms ease, box-shadow 200ms ease, border-color 200ms ease;
}

.project-card:hover,
.project-card:focus-within {
    transform: translateY(-4px);
    box-shadow: var(--shadow-hover);
    border-color: color-mix(in srgb, var(--primary) 28%, var(--border));
}

.project-media {
    aspect-ratio: 16 / 9;
    position: relative;
    overflow: hidden;
    background: linear-gradient(135deg, rgba(36, 87, 229, 0.12), rgba(214, 31, 105, 0.12));
    border-bottom: 1px solid var(--border);
}

.project-media img,
.project-media video {
    width: 100%;
    height: 100%;
    object-fit: cover;
}

.media-fallback {
    width: 100%;
    height: 100%;
    display: grid;
    place-items: center;
    padding: 1rem;
    color: var(--text-muted);
    text-align: center;
    font-weight: 700;
}

.project-content {
    padding: 1.05rem 1.05rem 1.15rem;
}

.project-content h3 {
    margin: 0 0 0.55rem;
    font-size: 1.08rem;
    line-height: 1.25;
    letter-spacing: -0.02em;
}

.project-content p {
    margin: 0;
    color: var(--text-muted);
    font-size: 0.95rem;
}

.tag-row {
    display: flex;
    flex-wrap: wrap;
    gap: 0.42rem;
    margin-top: 0.95rem;
}

.link-row {
    margin-top: 1rem;
    display: flex;
    flex-wrap: wrap;
    gap: 0.7rem;
}

.project-link {
    display: inline-flex;
    align-items: center;
    gap: 0.35rem;
    color: var(--primary);
    font-weight: 700;
    font-size: 0.94rem;
}

.project-link:hover,
.project-link:focus-visible {
    text-decoration: underline;
    outline: none;
}

.featured-badge {
    position: absolute;
    top: 0.85rem;
    left: 0.85rem;
    z-index: 1;
    padding: 0.35rem 0.68rem;
    border-radius: 999px;
    background: rgba(12, 18, 32, 0.74);
    color: white;
    font-size: 0.76rem;
    font-weight: 800;
    letter-spacing: 0.01em;
    border: 1px solid rgba(255, 255, 255, 0.18);
    backdrop-filter: blur(12px);
}

.empty-state {
    grid-column: 1 / -1;
    text-align: center;
    color: var(--text-muted);
    padding: 2rem 1rem;
    border-radius: 20px;
    border: 1px dashed var(--border);
    background: var(--bg-elevated-strong);
}

.footer {
    padding-top: 2.6rem;
}

.footer-card {
    border-radius: 30px;
    padding: 1.7rem;
    display: flex;
    justify-content: space-between;
    gap: 1.5rem;
    align-items: center;
    flex-wrap: wrap;
}

.footer-title {
    margin: 0;
    letter-spacing: -0.03em;
}

.footer-card p {
    margin: 0.35rem 0 0;
    color: var(--text-muted);
}

.small-links {
    display: flex;
    gap: 0.75rem;
    flex-wrap: wrap;
}

.small-links a {
    padding: 0.66rem 0.92rem;
    border-radius: 999px;
    background: var(--bg-elevated-strong);
    border: 1px solid var(--border);
}

.small-links a:hover,
.small-links a:focus-visible {
    background: var(--primary-soft);
    outline: none;
}

@media (max-width: 980px) {

    .about-grid,
    .projects-grid {
        grid-template-columns: 1fr 1fr;
    }

    .about-grid {
        grid-template-columns: 1fr;
    }
}

@media (max-width: 720px) {
    .site-header {
        position: static;
    }

    .header-inner,
    .section-heading,
    .project-toolbar,
    .footer-card {
        align-items: flex-start;
    }

    .nav-links {
        width: 100%;
    }

    .intro {
        padding-top: 2rem;
    }

    .projects-grid {
        grid-template-columns: 1fr;
    }
}