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

:root {
  --bg: #0b1220;
  --surface: #0f1a2f;
  --card: #111f3a;
  --text: #e7eefc;
  --muted: #a9b6d1;
  --border: rgba(255, 255, 255, 0.12);
  --accent: #4f8cff;

  --radius: 16px;
  --radius-sm: 12px;

  --container: 1000px;
  --shadow: 0 10px 30px rgba(0, 0, 0, 0.35);
}

html {
  color-scheme: dark;
}

body {
  margin: 0;
  font-family: system-ui, -apple-system, Segoe UI, Roboto, Helvetica, Arial, sans-serif;
  line-height: 1.6;
  background: radial-gradient(1200px 600px at 20% -10%, rgba(79, 140, 255, 0.25), transparent 60%),
              radial-gradient(900px 500px at 100% 0%, rgba(0, 220, 255, 0.12), transparent 60%),
              var(--bg);
  color: var(--text);
}

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

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

p {
  color: var(--muted);
  margin: 0 0 1rem;
}

h1, h2, h3 {
  color: var(--text);
  line-height: 1.2;
  margin: 0 0 0.75rem;
}

h1 {
  font-size: clamp(2rem, 4vw, 2.75rem);
}

h2 {
  font-size: clamp(1.4rem, 2.6vw, 1.9rem);
  margin-bottom: 0.75rem;
}

h3 {
  font-size: 1.15rem;
}

.section-lead {
  margin-top: 0.25rem;
  max-width: 65ch;
}

/* =========================
   Layout Helpers
========================= */
.container {
  width: min(var(--container), 100% - 2rem);
  margin: 0 auto;
}

.site-main section {
  padding: 3.5rem 0;
}

/* =========================
   Header / Nav
========================= */
.site-header {
  position: sticky;
  top: 0;
  z-index: 20;
  background: rgba(11, 18, 32, 0.7);
  backdrop-filter: blur(10px);
  border-bottom: 1px solid var(--border);
}

.site-header .container {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 1rem 0;
  gap: 1rem;
}

.brand {
  font-weight: 700;
  letter-spacing: 0.04em;
}

.site-nav {
  display: flex;
  gap: 0.9rem;
  flex-wrap: wrap;
}

.site-nav a {
  color: var(--muted);
  padding: 0.4rem 0.65rem;
  border-radius: 999px;
  border: 1px solid transparent;
}

.site-nav a:hover {
  color: var(--text);
  border-color: var(--border);
  background: rgba(255, 255, 255, 0.04);
}

/* highlight current page */
.site-nav a[aria-current="page"] {
  color: var(--text);
  border-color: rgba(79, 140, 255, 0.6);
  background: rgba(79, 140, 255, 0.12);
}

/* =========================
   Buttons
========================= */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 0.5rem;
  padding: 0.65rem 1rem;
  border-radius: 999px;
  border: 1px solid var(--border);
  background: rgba(255, 255, 255, 0.04);
  color: var(--text);
  font-weight: 600;
}

.btn:hover {
  background: rgba(255, 255, 255, 0.07);
}

.btn--primary {
  background: linear-gradient(135deg, rgba(79, 140, 255, 0.95), rgba(79, 140, 255, 0.55));
  border-color: rgba(79, 140, 255, 0.6);
}

.btn--primary:hover {
  filter: brightness(1.05);
}

.btn--small {
  padding: 0.5rem 0.85rem;
  font-size: 0.92rem;
}

/* =========================
   About Hero (Split Layout)
========================= */
.about-hero {
  padding-top: 2.5rem;
}

.about-hero__grid {
  display: grid;
  grid-template-columns: 1.75fr 1fr;
  gap: 1.75rem;
  align-items: start;
}

.about-hero__content {
  background: rgba(255, 255, 255, 0.03);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 1.5rem;
  box-shadow: var(--shadow);
}

.about-hero__actions {
  display: flex;
  gap: 0.75rem;
  flex-wrap: wrap;
  margin-top: 1.25rem;
}

/* =========================
   Profile Card
========================= */
.profile-card {
  background: linear-gradient(180deg, rgba(17, 31, 58, 0.9), rgba(15, 26, 47, 0.9));
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 1.25rem;
  box-shadow: var(--shadow);
  position: sticky;
  top: 5.2rem; /* below sticky header */
}

.profile-card__header {
  display: flex;
  gap: 0.85rem;
  align-items: center;
  padding-bottom: 0.9rem;
  border-bottom: 1px solid var(--border);
  margin-bottom: 0.9rem;
}

.profile-card__name {
  margin: 0;
  font-weight: 800;
  color: var(--text);
}

.profile-card__role {
  margin: 0.1rem 0 0;
  font-size: 0.95rem;
  color: var(--muted);
}

.profile-card__list {
  margin: 0;
  padding: 0;
}

.profile-card__item {
  display: grid;
  grid-template-columns: 9ch 1fr;
  gap: 0.75rem;
  padding: 0.6rem 0;
  border-bottom: 1px dashed rgba(255, 255, 255, 0.09);
}

.profile-card__item:last-child {
  border-bottom: none;
}

.profile-card dt {
  color: rgba(231, 238, 252, 0.8);
  font-weight: 700;
  font-size: 0.9rem;
}

.profile-card dd {
  margin: 0;
  color: var(--muted);
  font-size: 0.95rem;
}

.profile-card__links {
  display: flex;
  gap: 0.75rem;
  flex-wrap: wrap;
  padding-top: 1rem;
  margin-top: 0.75rem;
  border-top: 1px solid var(--border);
}

.profile-card__links a {
  color: rgba(79, 140, 255, 0.95);
  font-weight: 700;
}

.profile-card__links a:hover {
  text-decoration: underline;
}

/* =========================
   Timeline
========================= */
.timeline {
  list-style: none;
  margin: 1.5rem 0 0;
  padding: 0;
  display: grid;
  gap: 1rem;
}

.timeline__item {
  display: grid;
  grid-template-columns: 140px 1fr;
  gap: 1rem;
  padding: 1.25rem;
  border-radius: var(--radius);
  border: 1px solid var(--border);
  background: rgba(255, 255, 255, 0.03);
}

.timeline__date {
  display: inline-flex;
  padding: 0.35rem 0.6rem;
  border-radius: 999px;
  border: 1px solid rgba(79, 140, 255, 0.45);
  background: rgba(79, 140, 255, 0.12);
  color: var(--text);
  font-weight: 700;
  font-size: 0.9rem;
}

.timeline__content p {
  margin-bottom: 0;
}

/* =========================
   Cards (Featured Projects)
========================= */
.cards {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 1.25rem;
  margin-top: 1.5rem;
}

.card {
  border-radius: var(--radius);
  border: 1px solid var(--border);
  background: rgba(255, 255, 255, 0.03);
  padding: 1.25rem;
  box-shadow: var(--shadow);
}

.card__meta {
  margin: 0.2rem 0 0;
  color: var(--muted);
  font-size: 0.95rem;
}

.card__actions {
  display: flex;
  gap: 0.75rem;
  flex-wrap: wrap;
  margin-top: 1rem;
}

.tag-list {
  list-style: none;
  display: flex;
  gap: 0.5rem;
  flex-wrap: wrap;
  margin: 0.9rem 0 0;
  padding: 0;
}

.tag {
  font-size: 0.85rem;
  padding: 0.35rem 0.6rem;
  border-radius: 999px;
  border: 1px solid rgba(255, 255, 255, 0.14);
  background: rgba(255, 255, 255, 0.04);
  color: rgba(231, 238, 252, 0.9);
}

/* =========================
   Footer
========================= */
.site-footer {
  border-top: 1px solid var(--border);
  padding: 1.5rem 0 2.5rem;
  color: var(--muted);
}

.site-footer small {
  display: block;
  text-align: center;
}

/* =========================
   Responsive
========================= */
@media (max-width: 900px) {
  .about-hero__grid {
    grid-template-columns: 1fr;
  }

  .profile-card {
    position: static;
  }

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

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