/* ==========================================================================
   Design tokens
   ========================================================================== */
:root {
  --bg: #0b0f17;
  --bg-alt: #10151f;
  --surface: #161d2c;
  --surface-2: #1c2436;
  --border: rgba(255, 255, 255, 0.08);
  --text: #e9edf6;
  --text-dim: #9aa5ba;
  --text-faint: #6b7690;

  --accent: #7c6cf6;
  --accent-2: #22d3ee;
  --accent-grad: linear-gradient(120deg, var(--accent), var(--accent-2));

  --shadow: 0 20px 40px -20px rgba(0, 0, 0, 0.5);
  --radius-sm: 10px;
  --radius: 16px;
  --radius-lg: 24px;

  --font-display: "Space Grotesk", "Inter", sans-serif;
  --font-body: "Inter", sans-serif;

  --nav-h: 72px;
  --container: 1120px;

  color-scheme: dark;
}

:root[data-theme="light"] {
  --bg: #f6f7fb;
  --bg-alt: #ffffff;
  --surface: #ffffff;
  --surface-2: #f0f2f9;
  --border: rgba(15, 23, 42, 0.09);
  --text: #10131c;
  --text-dim: #4a5470;
  --text-faint: #7b8497;
  --shadow: 0 20px 40px -22px rgba(30, 41, 82, 0.25);
  color-scheme: light;
}

@media (prefers-color-scheme: light) {
  :root:not([data-theme="dark"]) {
    --bg: #f6f7fb;
    --bg-alt: #ffffff;
    --surface: #ffffff;
    --surface-2: #f0f2f9;
    --border: rgba(15, 23, 42, 0.09);
    --text: #10131c;
    --text-dim: #4a5470;
    --text-faint: #7b8497;
    --shadow: 0 20px 40px -22px rgba(30, 41, 82, 0.25);
    color-scheme: light;
  }
}

/* ==========================================================================
   Reset
   ========================================================================== */
*, *::before, *::after { box-sizing: border-box; }
html { scroll-behavior: smooth; scroll-padding-top: var(--nav-h); }
body {
  margin: 0;
  background: var(--bg);
  color: var(--text);
  font-family: var(--font-body);
  line-height: 1.6;
  -webkit-font-smoothing: antialiased;
  transition: background 0.3s ease, color 0.3s ease;
}
img { max-width: 100%; display: block; }
a { color: inherit; text-decoration: none; }
ul { list-style: none; margin: 0; padding: 0; }
h1, h2, h3 { font-family: var(--font-display); line-height: 1.15; margin: 0; }
p { margin: 0; }
button { font: inherit; color: inherit; background: none; border: none; cursor: pointer; }

.container {
  max-width: var(--container);
  margin: 0 auto;
  padding: 0 24px;
}

.skip-link {
  position: absolute;
  left: -999px;
  top: 0;
  background: var(--accent);
  color: #fff;
  padding: 12px 20px;
  border-radius: 0 0 8px 0;
  z-index: 999;
}
.skip-link:focus { left: 0; }

/* ==========================================================================
   Reveal-on-scroll
   ========================================================================== */
.reveal {
  opacity: 0;
  transform: translateY(24px);
  transition: opacity 0.7s ease, transform 0.7s ease;
}
.reveal.is-visible { opacity: 1; transform: translateY(0); }

@media (prefers-reduced-motion: reduce) {
  html { scroll-behavior: auto; }
  .reveal { opacity: 1; transform: none; transition: none; }
}

/* ==========================================================================
   Icons / buttons
   ========================================================================== */
.icon { width: 20px; height: 20px; flex-shrink: 0; }
.icon-sm { width: 18px; height: 18px; }
.icon-lg { width: 32px; height: 32px; color: var(--accent); }

.icon-btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 40px;
  height: 40px;
  border-radius: 50%;
  color: var(--text-dim);
  transition: background 0.2s ease, color 0.2s ease;
}
.icon-btn:hover { background: var(--surface-2); color: var(--text); }

.btn {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 13px 26px;
  border-radius: 999px;
  font-weight: 600;
  font-size: 0.95rem;
  transition: transform 0.2s ease, box-shadow 0.2s ease, background 0.2s ease, border-color 0.2s ease;
}
.btn--primary {
  background: var(--accent-grad);
  color: #fff;
  box-shadow: 0 12px 24px -10px rgba(124, 108, 246, 0.55);
}
.btn--primary:hover { transform: translateY(-2px); box-shadow: 0 16px 30px -10px rgba(124, 108, 246, 0.65); }
.btn--ghost {
  border: 1px solid var(--border);
  color: var(--text);
}
.btn--ghost:hover { border-color: var(--accent); color: var(--accent); transform: translateY(-2px); }

/* ==========================================================================
   Nav
   ========================================================================== */
.nav {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  height: var(--nav-h);
  z-index: 100;
  background: color-mix(in srgb, var(--bg) 78%, transparent);
  backdrop-filter: blur(14px);
  -webkit-backdrop-filter: blur(14px);
  border-bottom: 1px solid transparent;
  transition: border-color 0.3s ease, background 0.3s ease;
}
.nav.is-scrolled { border-bottom-color: var(--border); }

.nav__inner {
  height: 100%;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 16px;
}

.nav__brand {
  font-family: var(--font-display);
  font-weight: 700;
  font-size: 1.35rem;
  letter-spacing: -0.02em;
}
.nav__brand .dot { color: var(--accent); }

.nav__links {
  display: flex;
  gap: 32px;
  margin-left: auto;
  margin-right: 16px;
}
.nav__link {
  font-size: 0.94rem;
  font-weight: 500;
  color: var(--text-dim);
  position: relative;
  padding: 6px 0;
  transition: color 0.2s ease;
}
.nav__link::after {
  content: "";
  position: absolute;
  left: 0;
  bottom: 0;
  width: 0;
  height: 2px;
  background: var(--accent-grad);
  transition: width 0.25s ease;
}
.nav__link:hover, .nav__link.is-active { color: var(--text); }
.nav__link:hover::after, .nav__link.is-active::after { width: 100%; }

.nav__actions { display: flex; align-items: center; gap: 4px; }

.icon-sun, .icon-moon { display: none; }
:root:not([data-theme="light"]) .icon-sun { display: block; }
:root[data-theme="light"] .icon-moon { display: block; }
@media (prefers-color-scheme: light) {
  :root:not([data-theme="dark"]):not([data-theme="light"]) .icon-sun { display: none; }
  :root:not([data-theme="dark"]):not([data-theme="light"]) .icon-moon { display: block; }
}

.nav__toggle {
  display: none;
  flex-direction: column;
  justify-content: center;
  gap: 5px;
  width: 40px;
  height: 40px;
}
.nav__toggle span {
  width: 20px;
  height: 2px;
  background: var(--text);
  margin: 0 auto;
  transition: transform 0.25s ease, opacity 0.25s ease;
}
.nav__toggle[aria-expanded="true"] span:nth-child(1) { transform: translateY(7px) rotate(45deg); }
.nav__toggle[aria-expanded="true"] span:nth-child(2) { opacity: 0; }
.nav__toggle[aria-expanded="true"] span:nth-child(3) { transform: translateY(-7px) rotate(-45deg); }

@media (max-width: 820px) {
  .nav__toggle { display: flex; }
  .nav__links {
    position: fixed;
    top: var(--nav-h);
    left: 0;
    right: 0;
    flex-direction: column;
    background: var(--bg-alt);
    border-bottom: 1px solid var(--border);
    padding: 12px 24px 24px;
    gap: 4px;
    transform: translateY(-8px);
    opacity: 0;
    pointer-events: none;
    transition: transform 0.25s ease, opacity 0.25s ease;
  }
  .nav__links.is-open { transform: translateY(0); opacity: 1; pointer-events: auto; }
  .nav__link { padding: 12px 0; border-bottom: 1px solid var(--border); }
}

/* ==========================================================================
   Hero
   ========================================================================== */
.hero {
  position: relative;
  min-height: 100vh;
  display: flex;
  align-items: center;
  padding-top: var(--nav-h);
  overflow: hidden;
}
.hero::before {
  content: "";
  position: absolute;
  inset: -20% -10% auto -10%;
  height: 700px;
  background:
    radial-gradient(480px circle at 15% 20%, color-mix(in srgb, var(--accent) 28%, transparent), transparent 65%),
    radial-gradient(420px circle at 85% 10%, color-mix(in srgb, var(--accent-2) 22%, transparent), transparent 65%);
  pointer-events: none;
  z-index: -1;
}

.hero__inner {
  display: grid;
  grid-template-columns: 1.15fr 0.85fr;
  align-items: center;
  gap: 48px;
  padding-block: 64px;
}

.eyebrow {
  font-size: 0.95rem;
  font-weight: 600;
  color: var(--accent);
  margin-bottom: 12px;
  letter-spacing: 0.02em;
}

.hero__name {
  font-size: clamp(2.4rem, 5.5vw, 4rem);
  font-weight: 700;
  letter-spacing: -0.03em;
  background: var(--accent-grad);
  -webkit-background-clip: text;
  background-clip: text;
  color: transparent;
}

.hero__role {
  margin-top: 14px;
  font-size: clamp(1.05rem, 2vw, 1.3rem);
  font-weight: 500;
  color: var(--text-dim);
}
.hero__role .sep { color: var(--accent); margin: 0 4px; }

.hero__blurb {
  margin-top: 22px;
  max-width: 52ch;
  color: var(--text-dim);
  font-size: 1.02rem;
}

.hero__cta {
  display: flex;
  flex-wrap: wrap;
  gap: 14px;
  margin-top: 32px;
}

.social-row {
  display: flex;
  gap: 22px;
  margin-top: 36px;
}
.social-row a {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  color: var(--text-dim);
  font-size: 0.9rem;
  font-weight: 500;
  transition: color 0.2s ease;
}
.social-row a:hover { color: var(--accent); }

.hero__avatar { display: flex; justify-content: center; }
.avatar-ring {
  position: relative;
  width: min(320px, 60vw);
  aspect-ratio: 1;
  border-radius: 50%;
  padding: 8px;
  background: var(--accent-grad);
  box-shadow: var(--shadow);
}
.avatar-ring img {
  width: 100%;
  height: 100%;
  border-radius: 50%;
  object-fit: cover;
  object-position: 50% 25%;
  border: 4px solid var(--bg);
  background: var(--surface);
}

.scroll-cue {
  position: absolute;
  bottom: 28px;
  left: 50%;
  transform: translateX(-50%);
  color: var(--text-faint);
  animation: bob 2.4s ease-in-out infinite;
}
@keyframes bob {
  0%, 100% { transform: translate(-50%, 0); }
  50% { transform: translate(-50%, 8px); }
}

@media (max-width: 900px) {
  .hero__inner { grid-template-columns: 1fr; text-align: center; padding-block: 48px 32px; }
  .hero__blurb { margin-inline: auto; }
  .hero__cta, .social-row { justify-content: center; }
  .hero__avatar { order: -1; }
  .avatar-ring { width: 200px; }
}

/* ==========================================================================
   Sections (shared)
   ========================================================================== */
.section { padding: 108px 0; }
.section--alt { background: var(--bg-alt); }

.section__eyebrow {
  font-size: 0.85rem;
  font-weight: 700;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  color: var(--accent);
  margin-bottom: 10px;
}
.section__title {
  font-size: clamp(1.7rem, 3.2vw, 2.4rem);
  font-weight: 700;
  letter-spacing: -0.02em;
  margin-bottom: 20px;
}
.section__lede {
  color: var(--text-dim);
  max-width: 60ch;
  font-size: 1.02rem;
  margin-bottom: 44px;
  margin-top: -6px;
}

/* ==========================================================================
   About
   ========================================================================== */
.about__grid {
  display: grid;
  grid-template-columns: 1.4fr 1fr;
  gap: 40px;
  align-items: start;
}
.about__text { color: var(--text-dim); max-width: 58ch; }
.about__text + .about__text { margin-top: 16px; }

.facts {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 16px;
  grid-column: 2;
  grid-row: 1 / span 2;
}
.fact {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius-sm);
  padding: 18px;
  display: flex;
  flex-direction: column;
  gap: 6px;
}
.fact__label { font-size: 0.78rem; color: var(--text-faint); text-transform: uppercase; letter-spacing: 0.05em; }
.fact__value { font-weight: 600; font-size: 0.95rem; }

@media (max-width: 800px) {
  .about__grid { grid-template-columns: 1fr; }
  .facts { grid-column: 1; grid-row: auto; }
}

/* ==========================================================================
   Timeline (Education / Experience)
   ========================================================================== */
.timeline {
  position: relative;
  display: flex;
  flex-direction: column;
  gap: 28px;
  padding-left: 28px;
  border-left: 2px solid var(--border);
}
.timeline__item { position: relative; }
.timeline__dot {
  position: absolute;
  left: -34px;
  top: 6px;
  width: 12px;
  height: 12px;
  border-radius: 50%;
  background: var(--accent-grad);
  box-shadow: 0 0 0 4px var(--bg-alt);
}
.section:not(.section--alt) .timeline__dot { box-shadow: 0 0 0 4px var(--bg); }

.timeline__card {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 24px 28px;
  transition: transform 0.25s ease, box-shadow 0.25s ease;
}
.timeline__card:hover { transform: translateY(-3px); box-shadow: var(--shadow); }

.timeline__head {
  display: flex;
  flex-wrap: wrap;
  justify-content: space-between;
  align-items: baseline;
  gap: 8px 20px;
}
.timeline__head h3 { font-size: 1.1rem; font-weight: 600; }
.timeline__date {
  font-size: 0.82rem;
  color: var(--accent);
  font-weight: 600;
  white-space: nowrap;
}
.timeline__role { margin-top: 6px; color: var(--text-dim); font-weight: 500; font-size: 0.95rem; }
.timeline__desc { margin-top: 10px; color: var(--text-dim); font-size: 0.94rem; }
.timeline__list { margin-top: 10px; display: flex; flex-direction: column; gap: 6px; }
.timeline__list li {
  color: var(--text-dim);
  font-size: 0.94rem;
  padding-left: 18px;
  position: relative;
}
.timeline__list li::before {
  content: "";
  position: absolute;
  left: 0;
  top: 9px;
  width: 6px;
  height: 6px;
  border-radius: 50%;
  background: var(--accent);
}

/* ==========================================================================
   Skills
   ========================================================================== */
.skills__grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(230px, 1fr));
  gap: 20px;
}
.skill-card {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 26px;
  transition: transform 0.25s ease, box-shadow 0.25s ease, border-color 0.25s ease;
}
.skill-card:hover { transform: translateY(-4px); box-shadow: var(--shadow); border-color: color-mix(in srgb, var(--accent) 40%, var(--border)); }
.skill-card h3 { font-size: 1rem; font-weight: 600; margin-bottom: 16px; }

.chips { display: flex; flex-wrap: wrap; gap: 8px; }
.chip {
  font-size: 0.82rem;
  font-weight: 500;
  padding: 6px 13px;
  border-radius: 999px;
  background: var(--surface-2);
  border: 1px solid var(--border);
  color: var(--text-dim);
}
.chips--sm .chip { font-size: 0.76rem; padding: 5px 11px; }

/* ==========================================================================
   Projects
   ========================================================================== */
.projects__grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
  gap: 22px;
}
.project-card {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 26px;
  display: flex;
  flex-direction: column;
  gap: 14px;
  transition: transform 0.25s ease, box-shadow 0.25s ease, border-color 0.25s ease;
}
.project-card:hover { transform: translateY(-5px); box-shadow: var(--shadow); border-color: color-mix(in srgb, var(--accent) 40%, var(--border)); }

.project-card__top { display: flex; align-items: center; justify-content: space-between; }
.project-card__badge {
  font-size: 0.72rem;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.04em;
  padding: 5px 11px;
  border-radius: 999px;
  background: var(--accent-grad);
  color: #fff;
}
.project-card__badge--muted {
  background: var(--surface-2);
  color: var(--text-faint);
}
.project-card__links { display: flex; gap: 12px; color: var(--text-dim); }
.project-card__links a { transition: color 0.2s ease; }
.project-card__links a:hover { color: var(--accent); }

.project-card__title { font-size: 1.1rem; font-weight: 600; }
.project-card__desc { color: var(--text-dim); font-size: 0.92rem; flex-grow: 1; }

.project-card--more {
  align-items: center;
  justify-content: center;
  border-style: dashed;
  min-height: 100%;
}
.project-card__more-link {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 10px;
  color: var(--text-dim);
  font-weight: 600;
  transition: color 0.2s ease, transform 0.2s ease;
}
.project-card__more-link:hover { color: var(--accent); transform: translateY(-3px); }

/* ==========================================================================
   Achievements
   ========================================================================== */
.achievements__grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(240px, 1fr));
  gap: 20px;
}
.achieve-card {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 26px;
  transition: transform 0.25s ease, box-shadow 0.25s ease;
}
.achieve-card:hover { transform: translateY(-4px); box-shadow: var(--shadow); }
.achieve-card h3 { font-size: 1rem; font-weight: 600; margin: 14px 0 6px; }
.achieve-card p { color: var(--text-faint); font-size: 0.86rem; }

/* ==========================================================================
   Contact
   ========================================================================== */
.contact__grid {
  display: grid;
  grid-template-columns: 1.3fr 1fr;
  gap: 40px;
}
.contact__form {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius-lg);
  padding: 32px;
  display: flex;
  flex-direction: column;
  gap: 18px;
}
.hidden-field { position: absolute; left: -9999px; }
.field { display: flex; flex-direction: column; gap: 8px; font-size: 0.88rem; font-weight: 600; color: var(--text-dim); }
.field input, .field textarea {
  font: inherit;
  padding: 12px 14px;
  border-radius: var(--radius-sm);
  border: 1px solid var(--border);
  background: var(--surface-2);
  color: var(--text);
  resize: vertical;
  transition: border-color 0.2s ease;
}
.field input:focus, .field textarea:focus { outline: none; border-color: var(--accent); }
.contact__form .btn { align-self: flex-start; border: none; }

.contact__info {
  display: flex;
  flex-direction: column;
  gap: 18px;
  align-content: start;
}
.contact__link {
  display: flex;
  align-items: center;
  gap: 12px;
  padding: 16px 20px;
  border-radius: var(--radius-sm);
  border: 1px solid var(--border);
  background: var(--surface);
  color: var(--text-dim);
  font-weight: 500;
  font-size: 0.92rem;
  transition: transform 0.2s ease, color 0.2s ease, border-color 0.2s ease;
}
.contact__link:hover { color: var(--accent); border-color: var(--accent); transform: translateX(4px); }

@media (max-width: 820px) {
  .contact__grid { grid-template-columns: 1fr; }
}

/* ==========================================================================
   Footer
   ========================================================================== */
.footer { border-top: 1px solid var(--border); padding: 28px 0; }
.footer__inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  color: var(--text-faint);
  font-size: 0.86rem;
}