/* Sumit Shekhar portfolio. Plain CSS, no frameworks, no external fonts. */

/* ---------- Design tokens ---------- */
:root {
  --bg: #fbfaf7;
  --surface: #f3f1eb;
  --text: #1d1c19;
  --muted: #5d5b53;
  --line: #dedbd2;
  --accent: #8a3b1f;
  --accent-text: #fbfaf7;
  --focus: #1d5fbf;

  --font-body: system-ui, -apple-system, "Segoe UI", Roboto, "Helvetica Neue", Arial, sans-serif;
  --font-display: "Iowan Old Style", "Palatino Linotype", Palatino, "Book Antiqua", Georgia, serif;

  --max: 1120px;
  --gutter: clamp(1.25rem, 4vw, 2.5rem);
  --space-section: clamp(4rem, 9vw, 7.5rem);
  color-scheme: light;
}

@media (prefers-color-scheme: dark) {
  :root:not([data-theme="light"]) {
    --bg: #141413;
    --surface: #1c1b19;
    --text: #efeee9;
    --muted: #a7a59d;
    --line: #34332f;
    --accent: #e3a47f;
    --accent-text: #141413;
    --focus: #8fb8ff;
    color-scheme: dark;
  }
}

:root[data-theme="dark"] {
  --bg: #141413;
  --surface: #1c1b19;
  --text: #efeee9;
  --muted: #a7a59d;
  --line: #34332f;
  --accent: #e3a47f;
  --accent-text: #141413;
  --focus: #8fb8ff;
  color-scheme: dark;
}

/* ---------- Base ---------- */
*,
*::before,
*::after { box-sizing: border-box; }

html {
  scroll-behavior: smooth;
  -webkit-text-size-adjust: 100%;
}

body {
  margin: 0;
  background: var(--bg);
  color: var(--text);
  font-family: var(--font-body);
  font-size: 1.0625rem;
  line-height: 1.65;
  -webkit-font-smoothing: antialiased;
}

img { display: block; max-width: 100%; height: auto; }

a {
  color: var(--accent);
  text-decoration-thickness: 1px;
  text-underline-offset: 0.2em;
}
a:hover { text-decoration-thickness: 2px; }

:focus-visible {
  outline: 2px solid var(--focus);
  outline-offset: 3px;
  border-radius: 2px;
}

h1, h2, h3 {
  font-family: var(--font-display);
  font-weight: 500;
  line-height: 1.15;
  margin: 0 0 0.5em;
  letter-spacing: -0.01em;
}

p { margin: 0 0 1em; max-width: 68ch; }

ul { margin: 0; padding: 0; list-style: none; }

.skip-link {
  position: absolute;
  left: 1rem;
  top: -4rem;
  background: var(--text);
  color: var(--bg);
  padding: 0.6rem 1rem;
  z-index: 100;
  text-decoration: none;
}
.skip-link:focus { top: 1rem; }

.pending {
  color: var(--muted);
  font-size: 0.92rem;
  font-style: italic;
}

/* Layout container shared by header, sections and footer */
.site-header,
main,
.site-footer {
  width: min(100% - 2 * var(--gutter), var(--max));
  margin-inline: auto;
}

/* ---------- Header ---------- */
.site-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  flex-wrap: wrap;
  gap: 0.75rem 1.5rem;
  padding-block: 1.25rem;
  position: sticky;
  top: 0;
  background: var(--bg);
  z-index: 10;
  border-bottom: 1px solid transparent;
}
.site-header.is-scrolled { border-bottom-color: var(--line); }

.brand {
  font-family: var(--font-display);
  font-size: 1.2rem;
  color: var(--text);
  text-decoration: none;
  letter-spacing: -0.01em;
}

.site-nav ul {
  display: flex;
  flex-wrap: wrap;
  gap: 0.25rem 1.25rem;
}
.site-nav a {
  color: var(--muted);
  text-decoration: none;
  font-size: 0.95rem;
  padding: 0.25rem 0;
}
.site-nav a:hover,
.site-nav a:focus-visible {
  color: var(--text);
  text-decoration: underline;
  text-decoration-thickness: 1px;
  text-underline-offset: 0.3em;
}

.theme-toggle {
  display: inline-flex;
  align-items: center;
  gap: 0.4rem;
  background: none;
  border: 1px solid var(--line);
  color: var(--text);
  font: inherit;
  font-size: 0.9rem;
  padding: 0.4rem 0.8rem;
  border-radius: 999px;
  cursor: pointer;
}
.theme-toggle:hover { border-color: var(--muted); }
.theme-icon { font-size: 1rem; line-height: 1; }

/* ---------- Hero ---------- */
.hero {
  padding-block: clamp(4rem, 12vw, 9rem) clamp(3rem, 7vw, 5rem);
  border-bottom: 1px solid var(--line);
}
.eyebrow {
  font-size: 0.85rem;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  color: var(--muted);
  margin-bottom: 1.25rem;
}
.hero h1 {
  font-size: clamp(2.8rem, 8vw, 6rem);
  margin-bottom: 1.25rem;
  letter-spacing: -0.02em;
}
.lede {
  font-size: clamp(1.1rem, 2.2vw, 1.35rem);
  color: var(--muted);
  max-width: 40ch;
  margin-bottom: 2rem;
}
.hero-actions {
  display: flex;
  flex-wrap: wrap;
  gap: 0.75rem;
}

.btn {
  display: inline-block;
  padding: 0.7rem 1.25rem;
  border: 1px solid var(--text);
  border-radius: 2px;
  color: var(--text);
  text-decoration: none;
  font-size: 0.95rem;
  transition: background-color 0.2s ease, color 0.2s ease;
}
.btn:hover { background: var(--text); color: var(--bg); }
.btn-primary { background: var(--text); color: var(--bg); }
.btn-primary:hover { background: var(--accent); border-color: var(--accent); color: var(--accent-text); }

/* ---------- Sections ---------- */
.section {
  padding-block: var(--space-section);
  border-bottom: 1px solid var(--line);
  scroll-margin-top: 5rem;
}
.section:last-of-type { border-bottom: 0; }

.section-head {
  display: grid;
  gap: 0.5rem;
  margin-bottom: clamp(2rem, 5vw, 3.5rem);
}
.section-head h2 {
  font-size: clamp(2rem, 5vw, 3rem);
  margin: 0;
}
.section-head p { color: var(--muted); margin: 0; }

/* ---------- Projects ---------- */
.project {
  display: grid;
  gap: 1.5rem;
  padding-block: 2.5rem;
  border-top: 1px solid var(--line);
}
.project:first-of-type { border-top: 0; padding-top: 0; }

.project-media {
  margin: 0;
  overflow: hidden;
  border-radius: 4px;
  background: var(--surface);
  aspect-ratio: 16 / 9;
}
.project-media img {
  width: 100%;
  height: 100%;
  object-fit: cover;
}

.project-index {
  font-family: var(--font-display);
  color: var(--accent);
  margin: 0 0 0.25rem;
  font-size: 0.95rem;
}
.project h3 { font-size: clamp(1.5rem, 3vw, 1.9rem); }

.tags {
  display: flex;
  flex-wrap: wrap;
  gap: 0.4rem;
  margin: 0.75rem 0 1rem;
}
.tags li {
  font-size: 0.82rem;
  color: var(--muted);
  border: 1px solid var(--line);
  border-radius: 999px;
  padding: 0.15rem 0.65rem;
}

.project-links { margin: 0; }

@media (min-width: 800px) {
  .project {
    grid-template-columns: 1.1fr 1fr;
    align-items: center;
    gap: clamp(2rem, 5vw, 4rem);
  }
  .project:first-of-type { padding-top: 2.5rem; }
  .project:nth-of-type(even) .project-media { order: 2; }
}

/* ---------- Video grid ---------- */
.video-grid {
  display: grid;
  gap: 2rem 1.5rem;
  grid-template-columns: repeat(auto-fill, minmax(min(100%, 260px), 1fr));
}
.video-item { margin: 0; }
.video-thumb {
  aspect-ratio: 16 / 9;
  overflow: hidden;
  border-radius: 4px;
  background: var(--surface);
  margin-bottom: 0.75rem;
}
.video-thumb img { width: 100%; height: 100%; object-fit: cover; }
figcaption { display: grid; gap: 0.15rem; }
.video-title { font-family: var(--font-display); font-size: 1.1rem; }
.video-meta { color: var(--muted); font-size: 0.9rem; }
.note { color: var(--muted); font-size: 0.92rem; margin-top: 2rem; }

/* ---------- Skills ---------- */
.skills-grid {
  display: grid;
  gap: 2.5rem 3rem;
  grid-template-columns: repeat(auto-fit, minmax(min(100%, 220px), 1fr));
}
.skills-grid h3 {
  font-family: var(--font-body);
  font-size: 0.8rem;
  font-weight: 600;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  color: var(--muted);
  margin-bottom: 0.9rem;
}
.skills-grid li {
  padding: 0.55rem 0;
  border-bottom: 1px solid var(--line);
}

/* ---------- About ---------- */
.about {
  font-size: clamp(1.1rem, 2vw, 1.3rem);
  max-width: 62ch;
}
.about p { margin-bottom: 1.25rem; }

/* ---------- Contact ---------- */
.contact-list { display: grid; gap: 0; }
.contact-list li {
  display: grid;
  grid-template-columns: minmax(7rem, 12rem) 1fr;
  gap: 1rem;
  padding: 1rem 0;
  border-top: 1px solid var(--line);
  align-items: baseline;
}
.contact-list li:last-child { border-bottom: 1px solid var(--line); }
.contact-label { color: var(--muted); font-size: 0.92rem; }
.contact-list a { font-size: 1.1rem; word-break: break-word; }
.contact-list [data-contact] { overflow-wrap: anywhere; }

/* ---------- 404 page ---------- */
.not-found {
  min-height: 70vh;
  display: grid;
  align-content: center;
}
.not-found h1 { font-size: clamp(2.2rem, 6vw, 4rem); }

/* ---------- Footer ---------- */
.site-footer {
  display: flex;
  flex-wrap: wrap;
  justify-content: space-between;
  gap: 0.5rem 2rem;
  padding-block: 2.5rem 3rem;
  color: var(--muted);
  font-size: 0.9rem;
}
.site-footer p { margin: 0; }
.site-footer a { color: var(--muted); }

/* ---------- Small screens ---------- */
@media (max-width: 560px) {
  .site-header { padding-block: 1rem; }
  .site-nav ul { gap: 0.25rem 1rem; }
  .contact-list li { grid-template-columns: 1fr; gap: 0.2rem; }
}

/* ---------- Motion preferences ---------- */
@media (prefers-reduced-motion: reduce) {
  html { scroll-behavior: auto; }
  *,
  *::before,
  *::after {
    transition-duration: 0.01ms !important;
    animation-duration: 0.01ms !important;
  }
}

@media print {
  .site-header, .theme-toggle, .skip-link { display: none; }
  body { background: #fff; color: #000; }
}