/* ==========================================================================
   Alexander Sam — Portfolio Styles
   Font: DM Sans + JetBrains Mono
   ========================================================================== */

/* ---------- Theme Variables ---------- */
:root {
  --bg: #0b1220;
  --fg: #e5e7eb;
  --muted: #9aa4b2;
  --card: #0f172a;
  --border: #1f2937;
  --accent: #2563eb;
  --accent-contrast: #ffffff;
  --accent-soft: rgba(37, 99, 235, 0.12);
  --shadow: 0 16px 40px rgba(0, 0, 0, 0.35);
  --radius: 14px;
  --font: 'DM Sans', system-ui, -apple-system, sans-serif;
  --mono: 'JetBrains Mono', 'Fira Code', monospace;
}

[data-theme="light"] {
  --bg: #f8fafc;
  --fg: #0f172a;
  --muted: #475569;
  --card: #ffffff;
  --border: #e2e8f0;
  --accent: #2563eb;
  --accent-soft: rgba(37, 99, 235, 0.08);
  --shadow: 0 12px 28px rgba(2, 8, 23, 0.06);
}

/* ---------- Reset & Base ---------- */
*, *::before, *::after { box-sizing: border-box; }
html { scroll-behavior: smooth; }
body {
  margin: 0;
  font-family: var(--font);
  background: var(--bg);
  color: var(--fg);
  line-height: 1.65;
  -webkit-font-smoothing: antialiased;
}
a { color: inherit; text-decoration: none; }
img { max-width: 100%; display: block; }
strong { font-weight: 700; }

.container { width: min(1100px, 92%); margin: 0 auto; }
.section { padding: 80px 0; }

/* ---------- Typography ---------- */
h1 {
  font-size: clamp(2.2rem, 5vw, 3.2rem);
  line-height: 1.15;
  margin: 0 0 .75rem;
  font-weight: 800;
  letter-spacing: -0.02em;
}
h2 {
  font-size: clamp(1.5rem, 3.3vw, 2rem);
  margin: 0 0 1rem;
  font-weight: 700;
  letter-spacing: -0.01em;
}
h3 { font-size: 1.1rem; margin: 0 0 .5rem; font-weight: 600; }
p { margin: 0 0 .8rem; }
p.lead {
  font-size: clamp(1rem, 2.6vw, 1.15rem);
  color: var(--muted);
  margin: .2rem 0 1.6rem;
  max-width: 540px;
}
.muted { color: var(--muted); }

/* ---------- Buttons ---------- */
.btn {
  display: inline-flex;
  align-items: center;
  gap: .6rem;
  background: var(--accent);
  color: var(--accent-contrast);
  padding: .85rem 1.2rem;
  border-radius: calc(var(--radius) - 4px);
  border: 1px solid color-mix(in oklab, var(--accent), black 10%);
  box-shadow: var(--shadow);
  font-family: var(--font);
  font-weight: 600;
  font-size: .95rem;
  cursor: pointer;
  transition: transform .15s ease, box-shadow .2s ease, background .2s;
}
.btn:hover {
  transform: translateY(-2px);
  box-shadow: 0 16px 36px rgba(0, 0, 0, 0.2);
}
.btn--ghost {
  background: transparent;
  color: var(--fg);
  border-color: var(--border);
  box-shadow: none;
}
.btn--ghost:hover {
  background: var(--accent-soft);
  border-color: var(--accent);
  color: var(--accent);
}

/* ---------- Badges & Chips ---------- */
.badge {
  display: inline-block;
  padding: .35rem .65rem;
  border: 1px solid var(--border);
  border-radius: 999px;
  font-size: .85rem;
  color: var(--muted);
  background: var(--card);
  font-family: var(--font);
  cursor: default;
  transition: border-color .2s, color .2s;
}
a.badge:hover, button.badge:hover {
  border-color: var(--accent);
  color: var(--accent);
  cursor: pointer;
}
.badge--accent {
  background: var(--accent-soft);
  color: var(--accent);
  border-color: color-mix(in oklab, var(--accent), transparent 60%);
  font-weight: 600;
}

.chip {
  display: inline-flex;
  align-items: center;
  gap: .4rem;
  padding: .5rem .8rem;
  border-radius: 999px;
  background: var(--accent-soft);
  color: var(--accent);
  font-weight: 600;
  font-size: .9rem;
  margin-bottom: .8rem;
}

/* ---------- Cards ---------- */
.card {
  background: var(--card);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  box-shadow: var(--shadow);
  overflow: clip;
  transition: transform .2s ease, box-shadow .2s ease;
}
.card:hover {
  transform: translateY(-2px);
  box-shadow: 0 20px 48px rgba(0, 0, 0, 0.12);
}

/* ---------- Header ---------- */
.skip-link {
  position: absolute;
  left: -999px;
}
.skip-link:focus {
  left: 1rem;
  top: 1rem;
  background: var(--accent);
  color: var(--accent-contrast);
  padding: .5rem .75rem;
  border-radius: 8px;
  z-index: 1000;
}

.site-header {
  position: sticky;
  top: 0;
  z-index: 50;
  backdrop-filter: saturate(180%) blur(12px);
  -webkit-backdrop-filter: saturate(180%) blur(12px);
  background: color-mix(in oklab, var(--bg), transparent 30%);
  border-bottom: 1px solid var(--border);
}
.nav {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: .9rem 0;
}
.brand {
  display: flex;
  align-items: center;
  gap: .8rem;
  font-weight: 800;
  letter-spacing: .3px;
  font-size: 1.05rem;
}
.brand-mark {
  width: 38px;
  height: 38px;
  display: grid;
  place-items: center;
  border-radius: 10px;
  background: linear-gradient(135deg, color-mix(in oklab, var(--accent), white 15%) 0%, var(--accent) 100%);
  color: var(--accent-contrast);
  font-weight: 800;
  font-size: .85rem;
  font-family: var(--mono);
}
nav ul { list-style: none; display: flex; gap: .5rem; margin: 0; padding: 0; }
nav a {
  padding: .55rem .8rem;
  border-radius: 9px;
  color: var(--muted);
  font-weight: 600;
  font-size: .92rem;
  transition: color .15s, background .15s;
}
nav a:hover, nav a.active {
  color: var(--fg);
  background: var(--accent-soft);
}
.nav-actions { display: flex; align-items: center; gap: .6rem; }
.theme-toggle {
  border: 1px solid var(--border);
  background: var(--card);
  border-radius: 10px;
  padding: .5rem;
  cursor: pointer;
  color: var(--muted);
  transition: border-color .2s, color .2s;
}
.theme-toggle:hover { border-color: var(--accent); color: var(--accent); }
.hamburger {
  display: none;
  border: 1px solid var(--border);
  background: var(--card);
  border-radius: 10px;
  padding: .55rem;
  color: var(--muted);
  cursor: pointer;
}

/* Mobile menu */
@media (max-width: 860px) {
  nav ul { display: none; }
  .hamburger { display: inline-flex; }
  .mobile-menu {
    position: fixed;
    inset: 66px 0 auto;
    background: var(--card);
    border-bottom: 1px solid var(--border);
    padding: .75rem 1rem 1rem;
    display: none;
    z-index: 49;
  }
  .mobile-menu.open { display: block; }
  .mobile-menu a {
    display: block;
    padding: .75rem;
    border-radius: 10px;
    color: var(--muted);
    font-weight: 600;
  }
  .mobile-menu a:hover {
    background: var(--accent-soft);
    color: var(--fg);
  }
}

/* ---------- Hero ---------- */
.hero {
  display: grid;
  grid-template-columns: 1.15fr .85fr;
  gap: 2.5rem;
  align-items: center;
}
.hero .head { padding-top: 24px; }
.hero-cta { display: flex; gap: .8rem; flex-wrap: wrap; margin-bottom: .6rem; }
.hero .meta { display: flex; gap: .6rem; align-items: center; flex-wrap: wrap; margin-top: .8rem; }

.hero-card { overflow: hidden; }
.frame {
  aspect-ratio: 4 / 3;
  background: linear-gradient(135deg,
    color-mix(in oklab, var(--accent), white 20%),
    var(--accent),
    color-mix(in oklab, var(--accent), black 20%)
  );
  display: grid;
  place-items: center;
  position: relative;
}
.frame::before {
  content: '';
  position: absolute;
  inset: 0;
  background: repeating-linear-gradient(
    45deg,
    transparent,
    transparent 30px,
    rgba(255, 255, 255, 0.04) 30px,
    rgba(255, 255, 255, 0.04) 32px
  );
}
.frame-inner { text-align: center; position: relative; z-index: 1; }
.frame-icon { display: block; font-size: 2rem; color: rgba(255, 255, 255, 0.4); margin-bottom: .5rem; }
.frame-text {
  display: block;
  font-size: 2.5rem;
  font-weight: 800;
  color: var(--accent-contrast);
  letter-spacing: .8px;
  font-family: var(--mono);
}
.frame-sub {
  display: block;
  font-size: .85rem;
  color: rgba(255, 255, 255, 0.6);
  font-weight: 500;
  letter-spacing: 3px;
  text-transform: uppercase;
  margin-top: .4rem;
}

@media (max-width: 880px) {
  .hero { grid-template-columns: 1fr; }
}

/* ---------- About ---------- */
.about-card {
  padding: 1.8rem 2rem;
}
.about-card p {
  color: var(--muted);
  line-height: 1.75;
}
.about-card p strong { color: var(--fg); }

/* ---------- Skills ---------- */
.skills .group {
  padding: 1.2rem;
  border: 1px dashed var(--border);
  border-radius: 12px;
  background: color-mix(in oklab, var(--card), var(--bg) 40%);
  transition: border-color .2s;
}
.skills .group:hover { border-color: var(--accent); }
.skills .group h3 {
  margin-bottom: .7rem;
  font-size: .95rem;
  text-transform: uppercase;
  letter-spacing: .5px;
  color: var(--accent);
  font-family: var(--mono);
}
.badges { display: flex; gap: .5rem; flex-wrap: wrap; }

/* ---------- Grids ---------- */
.grid { display: grid; gap: 1.2rem; }
.grid.cols-3 { grid-template-columns: repeat(3, 1fr); }
.grid.cols-2 { grid-template-columns: repeat(2, 1fr); }
@media (max-width: 960px) { .grid.cols-3 { grid-template-columns: repeat(2, 1fr); } }
@media (max-width: 640px) { .grid.cols-3, .grid.cols-2 { grid-template-columns: 1fr; } }

/* ---------- Projects ---------- */
.project { display: flex; flex-direction: column; }
.project .media {
  aspect-ratio: 16 / 9;
  position: relative;
  overflow: hidden;
}
.media--blue { background: linear-gradient(135deg, #1e40af, #3b82f6); }
.media--teal { background: linear-gradient(135deg, #0f766e, #14b8a6); }
.media--orange { background: linear-gradient(135deg, #c2410c, #f97316); }
.media--purple { background: linear-gradient(135deg, #6d28d9, #a78bfa); }
.media--green { background: linear-gradient(135deg, #166534, #4ade80); }
.media--red { background: linear-gradient(135deg, #991b1b, #f87171); }

.project .media::after {
  content: '';
  position: absolute;
  inset: 0;
  background: repeating-linear-gradient(
    -45deg,
    transparent,
    transparent 20px,
    rgba(255, 255, 255, 0.05) 20px,
    rgba(255, 255, 255, 0.05) 22px
  );
}

.project .body {
  padding: 1.1rem;
  display: flex;
  flex-direction: column;
  gap: .6rem;
  flex: 1;
}
.project .title {
  display: flex;
  align-items: flex-start;
  justify-content: space-between;
  gap: .8rem;
}
.project .links { display: flex; gap: .5rem; flex-shrink: 0; }

/* ---------- Timeline ---------- */
.timeline { position: relative; }
.timeline::before {
  content: '';
  position: absolute;
  left: 8px;
  top: 4px;
  bottom: 4px;
  width: 2px;
  background: linear-gradient(180deg, var(--accent), var(--border));
}
.timeline .item {
  position: relative;
  padding-left: 2.2rem;
  margin-bottom: 1.6rem;
}
.timeline .item::before {
  content: '';
  position: absolute;
  left: 0;
  top: .3rem;
  width: 18px;
  height: 18px;
  border-radius: 999px;
  background: var(--accent);
  box-shadow: 0 0 0 4px var(--bg), 0 0 0 5px var(--accent);
}
.timeline .item h3 { margin-bottom: .2rem; }
.timeline .item p { color: var(--muted); margin-top: .4rem; }

/* ---------- Contact ---------- */
.contact-card {
  padding: 1.8rem 2rem;
}

/* ---------- Article Cards ---------- */
.grid.cols-1 { grid-template-columns: 1fr; }

.article-card {
  display: flex;
  flex-direction: row;
  text-decoration: none;
  cursor: pointer;
  overflow: hidden;
}
.article-card:hover { transform: translateY(-3px); }
.article-card:hover .article-card__cta { color: var(--accent); }
.article-card__accent {
  width: 6px;
  flex-shrink: 0;
  background: linear-gradient(180deg, var(--accent), color-mix(in oklab, var(--accent), black 30%));
}
.article-card__body {
  padding: 1.4rem 1.6rem;
  display: flex;
  flex-direction: column;
  gap: .6rem;
}
.article-card__meta {
  display: flex;
  align-items: center;
  gap: .6rem;
  font-size: .85rem;
}
.article-card__title {
  font-size: 1.35rem;
  font-weight: 700;
  margin: 0;
  letter-spacing: -0.01em;
  line-height: 1.35;
}
.article-card__body > p {
  line-height: 1.7;
  margin: 0;
}
.article-card__cta {
  font-weight: 600;
  color: var(--muted);
  font-size: .95rem;
  transition: color .2s;
  margin-top: .3rem;
}

/* ---------- Article Page ---------- */
.article-header {
  padding: 60px 0 40px;
  border-bottom: 1px solid var(--border);
}
.article-header h1 {
  font-size: clamp(1.8rem, 4.5vw, 2.8rem);
  max-width: 780px;
}
.article-header .lead {
  max-width: 680px;
}
.article-meta {
  display: flex;
  align-items: center;
  gap: .8rem;
  flex-wrap: wrap;
  margin-top: 1rem;
}
.article-content {
  max-width: 760px;
  margin: 0 auto;
  padding: 48px 0 80px;
}
.article-content h2 {
  margin-top: 2.5rem;
  padding-top: 1.5rem;
  border-top: 1px solid var(--border);
}
.article-content h2:first-child {
  margin-top: 0;
  padding-top: 0;
  border-top: none;
}
.article-content h3 {
  margin-top: 2rem;
  font-size: 1.15rem;
  color: var(--accent);
}
.article-content p {
  color: var(--muted);
  line-height: 1.8;
  font-size: 1.05rem;
}
.article-content strong { color: var(--fg); }
.article-content ul, .article-content ol {
  color: var(--muted);
  line-height: 1.8;
  padding-left: 1.5rem;
  font-size: 1.05rem;
}
.article-content li { margin-bottom: .4rem; }
.article-content li strong { color: var(--fg); }

.article-content blockquote {
  border-left: 4px solid var(--accent);
  margin: 1.5rem 0;
  padding: 1rem 1.2rem;
  background: var(--accent-soft);
  border-radius: 0 var(--radius) var(--radius) 0;
  font-style: italic;
}
.article-content blockquote p { color: var(--fg); margin: 0; }

.info-box {
  background: var(--card);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  overflow: hidden;
  margin: 1.5rem 0;
}
.info-box__header {
  padding: .8rem 1.2rem;
  font-weight: 700;
  font-size: .95rem;
}
.info-box__header--auto { background: color-mix(in oklab, var(--accent), transparent 80%); color: var(--accent); }
.info-box__header--augment { background: color-mix(in oklab, #ea580c, transparent 85%); color: #ea580c; }
.info-box__header--human { background: color-mix(in oklab, #dc2626, transparent 85%); color: #dc2626; }
.info-box__header--tool { background: color-mix(in oklab, #0891b2, transparent 80%); color: #0891b2; }
.info-box__body {
  padding: 1rem 1.2rem;
}
.info-box__body ul {
  margin: 0;
  padding-left: 1.2rem;
}
.info-box__body li {
  margin-bottom: .5rem;
  line-height: 1.65;
}

.skill-table {
  width: 100%;
  border-collapse: collapse;
  margin: 1rem 0 1.5rem;
  font-size: .95rem;
}
.skill-table th {
  text-align: left;
  padding: .7rem .8rem;
  background: color-mix(in oklab, var(--accent), transparent 80%);
  color: var(--accent);
  font-weight: 600;
  font-size: .85rem;
  text-transform: uppercase;
  letter-spacing: .5px;
}
.skill-table td {
  padding: .7rem .8rem;
  border-bottom: 1px solid var(--border);
  color: var(--muted);
  line-height: 1.6;
  vertical-align: top;
}
.skill-table td strong { color: var(--fg); }
.skill-table tr:nth-child(even) td { background: color-mix(in oklab, var(--card), var(--bg) 30%); }

.article-nav {
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding: 2rem 0;
  border-top: 1px solid var(--border);
  margin-top: 2rem;
}

/* ---------- Footer ---------- */
footer {
  padding: 40px 0 60px;
  border-top: 1px solid var(--border);
  margin-top: 40px;
}
.footer-grid {
  display: grid;
  gap: 1rem;
  grid-template-columns: 1fr auto;
  align-items: center;
}
@media (max-width: 640px) { .footer-grid { grid-template-columns: 1fr; } }

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

/* ---------- Section Badge ---------- */
.section-badge { vertical-align: middle; margin-left: .5rem; font-size: .8rem; }

/* ---------- Animations ---------- */
@media (prefers-reduced-motion: no-preference) {
  .hero .head { animation: fadeUp .6s ease both; }
  .hero-card { animation: fadeUp .6s ease .15s both; }

  .card { transition: transform .2s ease, box-shadow .2s ease; }

  @keyframes fadeUp {
    from { opacity: 0; transform: translateY(20px); }
    to { opacity: 1; transform: translateY(0); }
  }
}