/* =====================================================
   Nikhil Kumar Singh — Portfolio
   Editorial dark theme, single accent, no framework deps
   ===================================================== */

:root {
    --bg: #0e0e0e;
    --bg-elev: #161616;
    --bg-card: #1a1a1a;
    --line: #262626;
    --text: #f4ece1;
    --text-mute: #9a9389;
    --text-dim: #6b665e;
    --accent: #f5c518;
    --accent-soft: #f5c51820;
    --serif: "Fraunces", "Playfair Display", Georgia, serif;
    --sans: "Inter", system-ui, -apple-system, "Segoe UI", sans-serif;
    --mono: "JetBrains Mono", ui-monospace, "Cascadia Code", Consolas, monospace;
    --maxw: 1280px;
    --pad-x: clamp(1.25rem, 4vw, 3rem);
}

html.light {
    --bg: #f5efe6;
    --bg-elev: #ece5d8;
    --bg-card: #ffffff;
    --line: #d8cfbe;
    --text: #1a1a1a;
    --text-mute: #5a564f;
    --text-dim: #8a857c;
}

* { box-sizing: border-box; }
html { scroll-behavior: smooth; }
@media (prefers-reduced-motion: reduce) {
    html { scroll-behavior: auto; }
    *, *::before, *::after {
        animation-duration: .01ms !important;
        transition-duration: .01ms !important;
    }
}

body {
    margin: 0;
    background: var(--bg);
    color: var(--text);
    font-family: var(--sans);
    font-weight: 400;
    line-height: 1.5;
    -webkit-font-smoothing: antialiased;
    text-rendering: optimizeLegibility;
    overflow-x: hidden;
}

a { color: inherit; text-decoration: none; }
img { display: block; max-width: 100%; height: auto; }
button { font: inherit; color: inherit; background: none; border: 0; cursor: pointer; }

::selection { background: var(--accent); color: #0e0e0e; }

.container {
    max-width: var(--maxw);
    margin: 0 auto;
    padding-inline: var(--pad-x);
}

/* ---------- Typography ---------- */
.eyebrow {
    font-family: var(--mono);
    font-size: .75rem;
    font-weight: 500;
    letter-spacing: .14em;
    text-transform: uppercase;
    color: var(--text-mute);
}

.display {
    font-family: var(--serif);
    font-weight: 600;
    line-height: .95;
    letter-spacing: -.02em;
    font-style: italic;
    margin: 0;
}

.h-section {
    font-family: var(--serif);
    font-weight: 600;
    font-size: clamp(2rem, 5vw, 3.5rem);
    line-height: 1;
    letter-spacing: -.02em;
    margin: 0;
}

.italic { font-style: italic; }

/* ---------- Header ---------- */
.site-header {
    position: fixed;
    inset: 0 0 auto 0;
    z-index: 50;
    backdrop-filter: blur(14px);
    -webkit-backdrop-filter: blur(14px);
    background: color-mix(in srgb, var(--bg) 75%, transparent);
    border-bottom: 1px solid var(--line);
}
.site-header__inner {
    display: flex;
    align-items: center;
    justify-content: space-between;
    height: 68px;
}
.brand {
    font-family: var(--serif);
    font-style: italic;
    font-weight: 600;
    font-size: 1.25rem;
    letter-spacing: -.01em;
}
.brand span { color: var(--accent); }
.nav {
    display: none;
    gap: 2rem;
    font-family: var(--mono);
    font-size: .78rem;
    letter-spacing: .12em;
    text-transform: uppercase;
    color: var(--text-mute);
}
@media (min-width: 800px) { .nav { display: flex; } }
.nav a { transition: color .2s; }
.nav a:hover { color: var(--text); }
.theme-btn {
    width: 38px; height: 38px;
    display: grid; place-items: center;
    border-radius: 999px;
    border: 1px solid var(--line);
    transition: border-color .2s, color .2s;
}
.theme-btn:hover { border-color: var(--accent); color: var(--accent); }
.theme-btn .sun { display: none; }
html.light .theme-btn .sun { display: block; }
html.light .theme-btn .moon { display: none; }

/* ---------- Hero ---------- */
.hero {
    padding-top: 9rem;
    padding-bottom: 5rem;
    position: relative;
    border-bottom: 1px solid var(--line);
}
.hero__grid {
    display: grid;
    gap: clamp(2rem, 4vw, 4rem);
    grid-template-columns: 1fr;
}
@media (min-width: 1000px) {
    .hero__grid { grid-template-columns: 1.4fr 1fr; align-items: end; }
}
.hero__eyebrow-row {
    display: flex;
    align-items: center;
    gap: .9rem;
    margin-bottom: 1.75rem;
}
.hero__eyebrow-row::after {
    content: "";
    height: 1px; flex: 1;
    background: var(--line);
}
.hero__title {
    font-family: var(--serif);
    font-weight: 600;
    font-style: italic;
    font-size: clamp(3rem, 9vw, 7.5rem);
    line-height: .92;
    letter-spacing: -.03em;
    margin: 0 0 1.5rem;
}
.hero__title .accent { color: var(--accent); }
.hero__title .roman { font-style: normal; font-weight: 500; }
.hero__role {
    font-family: var(--mono);
    font-size: .85rem;
    letter-spacing: .15em;
    text-transform: uppercase;
    color: var(--text-mute);
    margin-bottom: 2rem;
    min-height: 1.4em;
}
.hero__role .cursor {
    display: inline-block;
    width: 8px; height: 1em;
    background: var(--accent);
    margin-left: 4px;
    transform: translateY(2px);
    animation: blink 1s steps(1) infinite;
}
@keyframes blink { 50% { opacity: 0; } }

.hero__lede {
    font-size: clamp(1rem, 1.4vw, 1.15rem);
    color: var(--text-mute);
    max-width: 36rem;
    margin: 0 0 2.25rem;
    line-height: 1.6;
}

.cta-row {
    display: flex;
    flex-wrap: wrap;
    gap: .75rem;
}
.btn {
    display: inline-flex;
    align-items: center;
    gap: .55rem;
    padding: .85rem 1.5rem;
    border-radius: 999px;
    font-size: .82rem;
    font-weight: 500;
    letter-spacing: .04em;
    transition: transform .25s, background .25s, color .25s, border-color .25s;
    border: 1px solid var(--line);
}
.btn--primary {
    background: var(--accent);
    color: #0e0e0e;
    border-color: var(--accent);
}
.btn--primary:hover { transform: translateY(-2px); }
.btn--ghost:hover { border-color: var(--accent); color: var(--accent); }
.btn--icon {
    width: 44px; height: 44px;
    padding: 0;
    justify-content: center;
}

/* Hero stats panel */
.hero__stats {
    display: grid;
    grid-template-columns: repeat(2, 1fr);
    gap: 2.5rem 2rem;
    border-top: 1px solid var(--line);
    padding-top: 2rem;
}
.stat__num {
    font-family: var(--serif);
    font-style: italic;
    font-weight: 500;
    font-size: clamp(2.75rem, 5vw, 4rem);
    line-height: 1;
    letter-spacing: -.02em;
    display: flex;
    align-items: flex-start;
    gap: .15em;
}
.stat__num sup {
    font-size: .35em;
    font-style: normal;
    font-family: var(--mono);
    color: var(--accent);
    margin-top: .4em;
}
.stat__label {
    font-family: var(--mono);
    font-size: .72rem;
    letter-spacing: .12em;
    text-transform: uppercase;
    color: var(--text-mute);
    margin-top: .65rem;
    line-height: 1.4;
}

/* ---------- Section frame ---------- */
.section {
    padding-block: clamp(4rem, 8vw, 7rem);
    border-bottom: 1px solid var(--line);
    position: relative;
}
.section__head {
    display: flex;
    flex-direction: column;
    gap: .9rem;
    margin-bottom: clamp(2.5rem, 5vw, 4rem);
}
.section__index {
    font-family: var(--mono);
    font-size: .72rem;
    letter-spacing: .15em;
    color: var(--text-dim);
}

/* ---------- Projects (cards) ---------- */
.projects {
    display: grid;
    grid-template-columns: 1fr;
    gap: 1.5rem;
}
@media (min-width: 720px) { .projects { grid-template-columns: repeat(2, 1fr); } }

.project {
    position: relative;
    display: flex;
    flex-direction: column;
    gap: 1.25rem;
    padding: 1.75rem;
    background: var(--bg-card);
    border: 1px solid var(--line);
    border-radius: 6px;
    overflow: hidden;
    transition: border-color .3s, transform .35s cubic-bezier(.2,.8,.2,1), background .3s;
}
.project::before {
    content: "";
    position: absolute;
    inset: 0 auto auto 0;
    width: 0; height: 2px;
    background: var(--accent);
    transition: width .5s cubic-bezier(.2,.8,.2,1);
}
.project:hover {
    border-color: var(--text-dim);
    transform: translateY(-4px);
}
.project:hover::before { width: 100%; }

.project__top {
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: 1rem;
}
.project__num {
    font-family: var(--mono);
    font-size: .7rem;
    color: var(--text-dim);
    letter-spacing: .14em;
}
.project__sub {
    font-family: var(--mono);
    font-size: .68rem;
    letter-spacing: .14em;
    text-transform: uppercase;
    color: var(--accent);
    margin: 0;
}
.project__title {
    font-family: var(--serif);
    font-weight: 600;
    font-style: italic;
    font-size: clamp(1.75rem, 3.5vw, 2.5rem);
    line-height: 1;
    letter-spacing: -.02em;
    margin: 0;
    transition: color .3s;
}
.project:hover .project__title { color: var(--accent); }
.project__summary {
    color: var(--text-mute);
    font-size: .95rem;
    line-height: 1.6;
    margin: 0;
    flex: 1;
}
.project__stack {
    display: flex;
    flex-wrap: wrap;
    gap: .4rem;
}
.tag {
    font-family: var(--mono);
    font-size: .68rem;
    letter-spacing: .08em;
    color: var(--text-mute);
    padding: .3rem .65rem;
    border: 1px solid var(--line);
    border-radius: 999px;
    transition: color .25s, border-color .25s;
}
.project:hover .tag { border-color: var(--text-dim); }
.project__links {
    display: flex;
    gap: .5rem;
    flex-wrap: wrap;
    padding-top: 1rem;
    border-top: 1px solid var(--line);
}
.project__link {
    display: inline-flex;
    align-items: center;
    gap: .4rem;
    font-family: var(--mono);
    font-size: .7rem;
    letter-spacing: .1em;
    text-transform: uppercase;
    color: var(--text-mute);
    padding: .5rem .85rem;
    border: 1px solid var(--line);
    border-radius: 999px;
    transition: all .25s;
}
.project__link:hover {
    color: #0e0e0e;
    background: var(--accent);
    border-color: var(--accent);
}

/* ---------- Experience ---------- */
.exp__list { display: flex; flex-direction: column; }
.exp {
    display: grid;
    grid-template-columns: 1fr;
    gap: 1rem;
    padding-block: 2rem;
    border-top: 1px solid var(--line);
}
@media (min-width: 800px) {
    .exp { grid-template-columns: 1fr 2.5fr; gap: 3rem; }
}
.exp__date {
    font-family: var(--mono);
    font-size: .78rem;
    letter-spacing: .1em;
    color: var(--text-mute);
}
.exp__title {
    font-family: var(--serif);
    font-style: italic;
    font-size: clamp(1.4rem, 2.5vw, 2rem);
    line-height: 1.1;
    margin: 0 0 .5rem;
}
.exp__role { color: var(--text-mute); margin: 0 0 1rem; font-size: .95rem; }
.exp__points { margin: 0; padding: 0; list-style: none; color: var(--text-mute); }
.exp__points li {
    padding-left: 1.25rem;
    position: relative;
    line-height: 1.6;
    margin-bottom: .5rem;
    font-size: .95rem;
}
.exp__points li::before {
    content: "—";
    position: absolute; left: 0;
    color: var(--accent);
}

/* ---------- Skills (cards) ---------- */
.skills {
    display: grid;
    grid-template-columns: 1fr;
    gap: 1.25rem;
}
@media (min-width: 700px) { .skills { grid-template-columns: 1fr 1fr; } }
@media (min-width: 1000px) { .skills { grid-template-columns: repeat(4, 1fr); } }

.skill-col {
    position: relative;
    padding: 1.75rem;
    background: var(--bg-card);
    border: 1px solid var(--line);
    border-radius: 6px;
    transition: border-color .3s, transform .35s cubic-bezier(.2,.8,.2,1);
}
.skill-col:hover {
    border-color: var(--text-dim);
    transform: translateY(-4px);
}
.skill-col__head {
    display: flex;
    align-items: center;
    justify-content: space-between;
    margin-bottom: 1.25rem;
    padding-bottom: 1rem;
    border-bottom: 1px solid var(--line);
}
.skill-col__label {
    font-family: var(--mono);
    font-size: .7rem;
    letter-spacing: .14em;
    text-transform: uppercase;
    color: var(--text);
}
.skill-col__num {
    font-family: var(--mono);
    font-size: .65rem;
    letter-spacing: .14em;
    color: var(--accent);
}
.skill-col__items {
    display: flex;
    flex-wrap: wrap;
    gap: .4rem;
}
.skill-col__items span {
    font-family: var(--mono);
    font-size: .75rem;
    letter-spacing: .04em;
    color: var(--text-mute);
    padding: .4rem .75rem;
    border: 1px solid var(--line);
    border-radius: 999px;
    transition: color .25s, border-color .25s, background .25s;
}
.skill-col:hover .skill-col__items span { border-color: var(--text-dim); }
.skill-col__items span:hover {
    color: #0e0e0e;
    background: var(--accent);
    border-color: var(--accent);
}

/* ---------- About ---------- */
.about {
    display: grid;
    grid-template-columns: 1fr;
    gap: 3rem;
}
@media (min-width: 900px) { .about { grid-template-columns: 1.3fr 1fr; gap: 5rem; } }
.about__copy p {
    color: var(--text-mute);
    font-size: 1.05rem;
    line-height: 1.7;
    margin: 0 0 1.25rem;
}
.about__copy strong { color: var(--text); font-weight: 500; }
.about__pull {
    border-left: 2px solid var(--accent);
    padding-left: 1.5rem;
    font-family: var(--serif);
    font-style: italic;
    font-size: 1.4rem;
    line-height: 1.4;
    color: var(--text);
    margin: 2rem 0;
}
.achieve {
    background: var(--bg-elev);
    border: 1px solid var(--line);
    border-radius: 4px;
    padding: 2rem;
}
.achieve h3 {
    font-family: var(--mono);
    font-size: .72rem;
    letter-spacing: .14em;
    text-transform: uppercase;
    color: var(--text-dim);
    margin: 0 0 1.5rem;
}
.achieve ul { list-style: none; margin: 0; padding: 0; }
.achieve li {
    padding: 1rem 0;
    border-top: 1px solid var(--line);
    font-family: var(--serif);
    font-style: italic;
    font-size: 1.1rem;
    line-height: 1.4;
    display: flex;
    gap: .9rem;
    align-items: baseline;
}
.achieve li:first-child { border-top: 0; padding-top: 0; }
.achieve li::before {
    content: "→";
    color: var(--accent);
    font-style: normal;
    font-family: var(--mono);
    font-size: .9rem;
}

/* ---------- Contact ---------- */
.contact {
    display: grid;
    grid-template-columns: 1fr;
    gap: 3rem;
}
@media (min-width: 900px) { .contact { grid-template-columns: 1fr 1fr; gap: 5rem; } }
.contact__head h2 {
    font-family: var(--serif);
    font-style: italic;
    font-size: clamp(2.5rem, 6vw, 4.5rem);
    line-height: .95;
    margin: 1rem 0 1.5rem;
}
.contact__head p { color: var(--text-mute); font-size: 1.05rem; line-height: 1.6; }
.contact__channels {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 0;
    margin-top: 2rem;
    border-top: 1px solid var(--line);
    border-left: 1px solid var(--line);
}
.contact__channels a {
    padding: 1.5rem;
    border-right: 1px solid var(--line);
    border-bottom: 1px solid var(--line);
    display: flex;
    align-items: center;
    gap: .9rem;
    font-family: var(--mono);
    font-size: .78rem;
    letter-spacing: .12em;
    text-transform: uppercase;
    color: var(--text-mute);
    transition: color .25s, background .25s;
}
.contact__channels a:hover { color: var(--accent); background: var(--bg-elev); }

.form { display: flex; flex-direction: column; gap: 1rem; }
.form label {
    font-family: var(--mono);
    font-size: .7rem;
    letter-spacing: .14em;
    text-transform: uppercase;
    color: var(--text-dim);
    margin-bottom: .4rem;
    display: block;
}
.form input, .form textarea {
    width: 100%;
    background: transparent;
    border: 0;
    border-bottom: 1px solid var(--line);
    color: var(--text);
    padding: .75rem 0;
    font-family: var(--sans);
    font-size: 1rem;
    transition: border-color .25s;
    font: inherit;
}
.form input:focus, .form textarea:focus {
    outline: 0;
    border-bottom-color: var(--accent);
}
.form textarea { resize: vertical; min-height: 90px; }
.form button {
    margin-top: .5rem;
    align-self: flex-start;
}
.form-status {
    font-family: var(--mono);
    font-size: .8rem;
    padding: .9rem 1rem;
    border-radius: 4px;
    display: none;
}
.form-status.show { display: block; }
.form-status.ok { background: var(--accent-soft); color: var(--accent); }
.form-status.err { background: #ef444420; color: #ef4444; }

/* ---------- Footer ---------- */
.footer {
    padding: 2.5rem 0;
    display: flex;
    justify-content: space-between;
    align-items: center;
    flex-wrap: wrap;
    gap: 1rem;
    color: var(--text-dim);
    font-family: var(--mono);
    font-size: .72rem;
    letter-spacing: .12em;
    text-transform: uppercase;
}
.footer__links { display: flex; gap: 1.25rem; }
.footer__links a { transition: color .2s; }
.footer__links a:hover { color: var(--accent); }

/* ---------- Reveal ---------- */
[data-reveal] {
    opacity: 0;
    transform: translateY(24px);
    transition: opacity .9s cubic-bezier(.2,.8,.2,1), transform .9s cubic-bezier(.2,.8,.2,1);
}
[data-reveal].is-revealed { opacity: 1; transform: none; }

/* ---------- Marquee accent strip ---------- */
.marquee {
    overflow: hidden;
    border-block: 1px solid var(--line);
    background: var(--bg-elev);
    padding-block: 1.25rem;
}
.marquee__track {
    display: flex;
    gap: 3rem;
    white-space: nowrap;
    animation: scroll 40s linear infinite;
    font-family: var(--serif);
    font-style: italic;
    font-size: 1.4rem;
    color: var(--text-mute);
    width: max-content;
}
.marquee__track span { display: inline-flex; align-items: center; gap: 3rem; }
.marquee__track .dot { color: var(--accent); }
@keyframes scroll {
    to { transform: translateX(-50%); }
}
@media (prefers-reduced-motion: reduce) {
    .marquee__track { animation: none; }
}

/* ---------- Icon sizing ---------- */
.icon { width: 16px; height: 16px; flex-shrink: 0; }
.icon--lg { width: 20px; height: 20px; }