@import url('https://fonts.googleapis.com/css2?family=DM+Mono:wght@300;400;500&family=DM+Sans:ital,opsz,wght@0,9..40,300;0,9..40,400;0,9..40,500;0,9..40,600;1,9..40,300;1,9..40,400&display=swap');

:root {
    --accent: #5ec4b0;
    --accent-dim: #4aab98;
    --accent-soft: rgba(94, 196, 176, 0.10);
    --accent-glow: rgba(94, 196, 176, 0.07);

    --bg: #0d1117;
    --bg-card: rgba(255, 255, 255, 0.032);
    --bg-card-hover: rgba(255, 255, 255, 0.055);
    --surface: #161c27;
    --border: rgba(255, 255, 255, 0.07);
    --border-hover: rgba(94, 196, 176, 0.22);

    --text: #e8edf5;
    --text-muted: #8d9aaa;
    --text-faint: #2a3345;

    --mono: 'DM Mono', monospace;
    --sans: 'DM Sans', sans-serif;

    --radius: 14px;
    --nav-h: 64px;
}

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

html { scroll-behavior: smooth; }

body {
    background: var(--bg);
    color: var(--text);
    font-family: var(--sans);
    font-size: 18px;
    line-height: 1.75;
    min-height: 100vh;
    -webkit-font-smoothing: antialiased;
    font-optical-sizing: auto;
}

a {
    color: var(--accent);
    text-decoration: none;
    transition: color .2s, opacity .2s;
}
a:hover { color: #fff; }

/* ─── Deep ambient glow — very soft, not aggressive ─── */
body::before {
    content: '';
    position: fixed;
    top: -20vh;
    left: 50%;
    transform: translateX(-50%);
    width: 100vw;
    height: 100vh;
    background: radial-gradient(ellipse 70% 55% at 50% 0%,
        rgba(94, 196, 176, 0.045) 0%,
        transparent 70%);
    pointer-events: none;
    z-index: 0;
}

/* ─── Extremely subtle noise texture ─── */
body::after {
    content: '';
    position: fixed;
    inset: 0;
    background-image: url("data:image/svg+xml,%3Csvg viewBox='0 0 256 256' xmlns='http://www.w3.org/2000/svg'%3E%3Cfilter id='noise'%3E%3CfeTurbulence type='fractalNoise' baseFrequency='0.9' numOctaves='4' stitchTiles='stitch'/%3E%3C/filter%3E%3Crect width='100%25' height='100%25' filter='url(%23noise)' opacity='0.04'/%3E%3C/svg%3E");
    opacity: .45;
    pointer-events: none;
    z-index: 0;
}

/* ─── 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 clamp(1.5rem, 6vw, 5rem);
    border-bottom: 1px solid transparent;
    transition: background .4s, border-color .4s, backdrop-filter .4s;
}

nav.scrolled {
    background: rgba(13, 17, 23, 0.75);
    backdrop-filter: blur(20px) saturate(1.6);
    -webkit-backdrop-filter: blur(20px) saturate(1.6);
    border-bottom-color: var(--border);
}

.nav-logo {
    font-family: var(--mono);
    font-size: .82rem;
    font-weight: 400;
    color: var(--text);
    letter-spacing: .04em;
}
.nav-logo span { color: var(--accent); }

.nav-links {
    display: flex;
    gap: 2.5rem;
    list-style: none;
}

.nav-links a {
    font-family: var(--mono);
    font-size: .75rem;
    color: var(--text-muted);
    letter-spacing: .1em;
    text-transform: uppercase;
    transition: color .2s;
}
.nav-links a:hover { color: var(--text); }

/* ─── Hero ────────────────────────────────────────────── */
#home {
    position: relative;
    min-height: 100vh;
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    text-align: center;
    padding: calc(var(--nav-h) + 2rem) 1.5rem 4rem;
    z-index: 1;
}

.hero-tag {
    font-family: var(--sans);
    font-size: .72rem;
    color: var(--accent);
    letter-spacing: .22em;
    text-transform: uppercase;
    margin-bottom: 2rem;
    opacity: 0;
    animation: fadeUp .7s .1s forwards;
}

.hero-title {
    font-family: var(--mono);
    font-size: clamp(2.4rem, 7vw, 5rem);
    font-weight: 300;
    color: var(--text);
    line-height: 1.12;
    letter-spacing: -.05em;
    opacity: 0;
    animation: fadeUp .7s .25s forwards;
}

/* Blinking cursor */
.cursor {
    display: inline-block;
    width: 0.5em;
    height: .88em;
    background: var(--accent);
    margin-left: .1em;
    vertical-align: baseline;
    border-radius: 1px;
    animation: blink 1.1s linear infinite;
}

@keyframes blink {
    0%, 54.5%, 100% { opacity: 1; }
    12%, 50% { opacity: 0; }
}

.hero-sub {
    margin-top: 1.8rem;
    font-size: 1.05rem;
    font-weight: 300;
    color: var(--text-muted);
    max-width: 460px;
    line-height: 1.85;
    opacity: 0;
    animation: fadeUp .7s .4s forwards;
}
.hero-sub em {
    font-style: normal;
    color: var(--text);
    font-weight: 400;
}

.scroll-hint {
    position: absolute;
    bottom: 2.4rem;
    left: 50%;
    transform: translateX(-50%);
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: .5rem;
    font-family: var(--mono);
    font-size: .65rem;
    color: var(--text-faint);
    letter-spacing: .14em;
    text-transform: uppercase;
    opacity: 0;
    animation: fadeUp .7s .85s forwards;
}

.scroll-arrow {
    width: 1px;
    height: 40px;
    background: linear-gradient(to bottom, rgba(94,196,176,.3), transparent);
}

/* ─── Sections ────────────────────────────────────────── */
section { position: relative; z-index: 1; }

.section-label {
    font-family: var(--mono);
    font-size: .68rem;
    color: var(--accent);
    letter-spacing: .2em;
    text-transform: uppercase;
    margin-bottom: .6rem;
}

.section-title {
    font-size: clamp(1.5rem, 3.5vw, 2rem);
    font-weight: 400;
    color: var(--text);
    letter-spacing: -.02em;
    margin-bottom: .85rem;
}

.section-desc {
    font-size: .93rem;
    font-weight: 300;
    color: var(--text-muted);
    max-width: 480px;
    line-height: 1.8;
}

/* ─── Projects ────────────────────────────────────────── */
#projects {
    padding: 6rem clamp(1.5rem, 8vw, 8rem);
}

.projects-header { margin-bottom: 3rem; }

.projects-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(300px, 1fr));
    gap: 1rem;
}

/* ─── Category color palette for left borders ─────────── */
:root {
    --cat-infra:  #5ec4b0;
    --cat-game:   #9b8fe8;
    --cat-oss:    #60a5e8;
    --cat-audio:  #e87d60;
    --cat-sci:    #e8c060;

    --cat-infra-rgb:  94, 196, 176;
    --cat-game-rgb:   155, 143, 232;
    --cat-oss-rgb:    96, 165, 232;
    --cat-audio-rgb:  232, 125, 96;
    --cat-sci-rgb:    232, 192, 96;
}

/* ─── Cards — left border accent style ───────────────── */
.card {
    background: var(--bg-card);
    border: 1px solid var(--border);
    border-left: 3px solid var(--card-accent, var(--border));
    border-radius: 0 var(--radius) var(--radius) 0;
    padding: 1.6rem 1.75rem 1.6rem 1.5rem;
    display: flex;
    flex-direction: column;
    gap: .75rem;
    position: relative;
    overflow: hidden;
    transition: background .3s, border-color .3s, transform .35s ease, box-shadow .35s;
    will-change: transform;
}

.card.cat-infra  { --card-accent: var(--cat-infra);  --card-accent-rgb: var(--cat-infra-rgb); }
.card.cat-game   { --card-accent: var(--cat-game);   --card-accent-rgb: var(--cat-game-rgb); }
.card.cat-oss    { --card-accent: var(--cat-oss);    --card-accent-rgb: var(--cat-oss-rgb); }
.card.cat-audio  { --card-accent: var(--cat-audio);  --card-accent-rgb: var(--cat-audio-rgb); }
.card.cat-sci    { --card-accent: var(--cat-sci);    --card-accent-rgb: var(--cat-sci-rgb); }

.card::before {
    content: '';
    position: absolute;
    inset: 0;
    background: linear-gradient(
        to right,
        rgba(var(--card-accent-rgb), 0.09) 0%,
        transparent 55%
    );
    pointer-events: none;
    border-radius: inherit;
}

.card:hover {
    background: var(--bg-card-hover);
    border-color: var(--border);
    border-left-color: var(--card-accent, var(--border));
    transform: translateY(-3px);
    box-shadow: 0 16px 40px rgba(0,0,0,0.28), 0 2px 8px rgba(0,0,0,0.16);
    cursor: default;
}

/* ─── Card meta line ──────────────────────────────────── */
.card-meta {
    font-family: var(--mono);
    font-size: .65rem;
    color: var(--card-accent, var(--text-muted));
    letter-spacing: .1em;
    text-transform: uppercase;
    opacity: .75;
    margin-bottom: -.1rem;
}

.card-title {
    font-size: 1rem;
    font-weight: 500;
    color: var(--text);
    letter-spacing: -.01em;
}

.card-desc {
    font-size: .9rem;
    font-weight: 300;
    color: var(--text-muted);
    line-height: 1.75;
    flex: 1;
}

.card-tags {
    display: flex;
    flex-wrap: wrap;
    gap: .35rem;
    margin-top: .2rem;
}

.tag {
    font-family: var(--mono);
    font-size: .65rem;
    padding: .18rem .5rem;
    border-radius: 5px;
    background: rgba(255,255,255,0.04);
    color: var(--text-muted);
    border: 1px solid rgba(255,255,255,0.07);
    letter-spacing: .04em;
}

.card-link {
    font-family: var(--mono);
    font-size: .80rem;
    color: var(--accent);
    display: inline;
    align-items: center;
    gap: .3rem;
    letter-spacing: .03em;
    margin-top: .35rem;
    opacity: .8;
    transition: opacity .2s;
}
.card-link::after { content: ' →'; font-size: .8rem; transition: margin-left .2s; }
.card:hover .card-link { opacity: 1; }
.card-link:hover::after { margin-left: 0.2rem; }

/* ─── Divider ─────────────────────────────────────────── */
.divider {
    width: 1px;
    height: 60px;
    background: linear-gradient(to bottom, transparent, var(--border), transparent);
    margin: 0 auto;
}

/* ─── Footer ──────────────────────────────────────────── */
footer {
    position: relative;
    z-index: 1;
    text-align: center;
    padding: 2.5rem 1.5rem;
    border-top: 1px solid var(--border);
    font-family: var(--mono);
    font-size: .7rem;
    color: var(--text-faint);
    letter-spacing: .08em;
}
footer a { color: var(--text-muted); }
footer a:hover { color: var(--accent); }

/* ─── About page ──────────────────────────────────────── */
#about-page {
    display: none;
    min-height: 100vh;
    padding: calc(var(--nav-h) + 5rem) 1.5rem 6rem;
    justify-content: center;
    position: relative;
    z-index: 1;
}
#about-page.active { display: flex; }
#home-page.hidden { display: none; }

.about-inner { max-width: 640px; }

.about-tagline {
    font-size: clamp(1.4rem, 4vw, 2rem);
    font-weight: 400;
    letter-spacing: -.02em;
    color: var(--text);
    line-height: 1.35;
    margin-bottom: 2rem;
}
.about-tagline em {
    font-style: normal;
    color: var(--accent);
}

.about-body {
    font-size: .95rem;
    font-weight: 300;
    color: var(--text-muted);
    line-height: 1.9;
}
.about-body p + p { margin-top: 1.25rem; }

.about-highlight {
    display: block;
    font-size: 1.02rem;
    font-style: italic;
    color: var(--text);
    font-weight: 300;
    line-height: 1.85;
    padding-left: 1.1rem;
    border-left: 2px solid var(--accent);
    margin: 2.5rem 0;
    opacity: .9;
}

.about-tech {
    margin-top: 2rem;
}
.about-tech > p {
    font-family: var(--mono);
    font-size: .7rem;
    color: var(--text-faint);
    letter-spacing: .14em;
    text-transform: uppercase;
    margin-bottom: .85rem;
}

.about-chips {
    display: flex;
    flex-wrap: wrap;
    gap: .45rem;
}

.chip {
    font-family: var(--mono);
    font-size: .7rem;
    padding: .28rem .7rem;
    border-radius: 999px;
    border: 1px solid var(--border);
    color: var(--text-muted);
    letter-spacing: .04em;
    background: rgba(255,255,255,0.025);
    transition: border-color .2s, color .2s;
}
.chip:hover {
    border-color: rgba(94, 196, 176, 0.25);
    color: var(--text);
}

/* ─── Photo section ───────────────────────────────────── */
.about-photos {
    width: 100%;
    max-width: 1000px;
    margin-top: 5rem;
}
.about-photos-header { margin-bottom: 2rem; }

.photos-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(220px, 1fr));
    gap: 1.1rem;
}

.photo-card {
    display: flex;
    flex-direction: column;
    gap: .7rem;
}

.photo-placeholder {
    width: 100%;
    aspect-ratio: 1 / 1;
    background: var(--surface);
    border: 1px solid var(--border);
    border-radius: var(--radius);
    overflow: hidden;
    position: relative;
    transition: border-color .3s;
}
.photo-placeholder:hover { border-color: rgba(94,196,176,0.2); }

.photo-placeholder img {
    width: 100%;
    height: 100%;
    object-fit: cover;
    display: block;
}

.photo-caption {
    font-size: .8rem;
    font-weight: 300;
    color: var(--text-muted);
    line-height: 1.6;
}
.photo-caption strong {
    display: block;
    font-size: .83rem;
    font-weight: 500;
    color: var(--text);
    margin-bottom: .15rem;
}

/* ─── Animations ──────────────────────────────────────── */
@keyframes fadeUp {
    from { opacity: 0; transform: translateY(16px); }
    to   { opacity: 1; transform: translateY(0); }
}

/* ─── Mobile ──────────────────────────────────────────── */
@media (max-width: 500px) {
    .nav-links { gap: 1.5rem; }
    #projects { padding: 4rem 1.25rem; }
}