/* ── Variables ───────────────────────────────── */
:root {
  --bg:         #faf8f4;
  --surface:    #f0ebe3;
  --border:     #d0c9bf;
  --text:       #1c1c1c;
  --muted:      #6b6456;
  --accent:     #0f766e;
  --accent-bg:  rgba(15, 118, 110, 0.08);
  --mono:       'Courier New', monospace;
  --sans:       'Inter', sans-serif;
  --display:    'Comfortaa', cursive;
  --radius:     8px;
  --ease:       0.25s ease;
}

/* ── Reset ───────────────────────────────────── */
*, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }
html { scroll-behavior: smooth; }
body {
  background-color: #d4ddd8;
  background-image: url('1139623-cable-881759.jpg');
  background-attachment: fixed;
  background-size: cover;
  background-position: center;
  color: var(--text);
  font-family: var(--sans);
  font-weight: 400;
  line-height: 1.65;
  -webkit-font-smoothing: antialiased;
}
a { color: var(--accent); text-decoration: none; transition: opacity var(--ease); }
a:hover { opacity: 0.7; }

/* ── Loading ─────────────────────────────────── */
#loading {
  position: fixed;
  inset: 0;
  background: #faf8f4;
  display: flex;
  align-items: center;
  justify-content: center;
  z-index: 1000;
  transition: opacity 0.5s ease, visibility 0.5s ease;
}
#loading.hidden { opacity: 0; visibility: hidden; }

#spinner {
  width: 38px;
  height: 38px;
  border: 2px solid var(--border);
  border-top-color: var(--accent);
  border-radius: 50%;
  animation: spin 0.75s linear infinite;
}
@keyframes spin { to { transform: rotate(360deg); } }

/* ── Header ──────────────────────────────────── */
#header {
  position: fixed;
  top: 0; left: 0; right: 0;
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 20px 60px;
  background: rgba(250, 248, 244, 0.88);
  backdrop-filter: blur(12px);
  border-bottom: 1px solid var(--border);
  z-index: 100;
  animation-fill-mode: both;
  animation-delay: 1.5s;
}

#title {
  font-family: var(--display);
  font-size: 1.35rem;
  color: var(--accent);
}

#links {
  display: flex;
  gap: 36px;
}
#links a {
  font-family: var(--mono);
  font-size: 0.85rem;
  color: var(--muted);
  letter-spacing: 0.5px;
  transition: color var(--ease);
}
#links a:hover { color: var(--accent); opacity: 1; }

/* ── Hero ────────────────────────────────────── */
#hero {
  min-height: 100vh;
  display: flex;
  align-items: center;
  padding: 120px 60px 80px;
  position: relative;
}
#hero::before {
  content: '';
  position: absolute;
  inset: 0;
  background: rgba(250, 248, 244, 0.60);
  pointer-events: none;
}
#hero > * { position: relative; z-index: 1; }
#hero-content {
  max-width: 1100px;
  margin: 0 auto;
  width: 100%;
  animation-fill-mode: both;
  animation-delay: 1.7s;
}

#greeting {
  font-family: var(--display);
  font-size: clamp(2rem, 5vw, 3.4rem);
  color: var(--text);
  line-height: 1.2;
  margin-bottom: 14px;
}

#hero-sub1,
#hero-sub2 {
  font-size: 0.95rem;
  color: var(--text);
  letter-spacing: 0.2px;
  display: inline-block;
  background: rgba(250, 248, 244, 0.82);
  backdrop-filter: blur(4px);
  padding: 3px 10px;
  border-radius: 4px;
}

#hero-sub1 { margin-bottom: 6px; }
#hero-sub2 { margin-bottom: 40px; }

#hero-links {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
}

/* ── Buttons ─────────────────────────────────── */
.btn-primary,
.btn-secondary {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 10px 20px;
  border-radius: var(--radius);
  font-family: var(--mono);
  font-size: 0.83rem;
  letter-spacing: 0.3px;
  transition: all var(--ease);
  cursor: pointer;
  white-space: nowrap;
}

.btn-primary {
  background: var(--accent);
  color: #fff;
  font-weight: 700;
}
.btn-primary:hover {
  background: transparent;
  color: var(--accent);
  box-shadow: inset 0 0 0 1px var(--accent);
  opacity: 1;
}

.btn-secondary {
  color: var(--text);
  background: rgba(250, 248, 244, 0.75);
  box-shadow: inset 0 0 0 1.5px var(--muted);
  backdrop-filter: blur(4px);
}
.btn-secondary:hover {
  color: var(--accent);
  background: rgba(250, 248, 244, 0.92);
  box-shadow: inset 0 0 0 1.5px var(--accent);
  opacity: 1;
}

/* ── Sections ────────────────────────────────── */
section { padding: 100px 0; background: rgba(250, 248, 244, 0.93); }
.section-inner {
  max-width: 1100px;
  margin: 0 auto;
  padding: 0 60px;
}

.section-title {
  font-family: var(--display);
  font-size: 1.9rem;
  color: var(--text);
  margin-bottom: 10px;
}

.section-sub {
  font-size: 0.92rem;
  color: var(--muted);
  margin-bottom: 44px;
}
.section-sub a { font-size: 0.88rem; }

#research, #volunteering, #awards { background: rgba(240, 235, 227, 0.93); }
#background { background: rgba(250, 248, 244, 0.96); }
#hero { background: transparent; }

/* ── Cards ───────────────────────────────────── */
.cards {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(290px, 1fr));
  gap: 18px;
}

.card {
  display: block;
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 26px;
  transition: border-color var(--ease), transform var(--ease);
  color: inherit;
  text-decoration: none;
}
.card:hover {
  border-color: var(--accent);
  transform: translateY(-4px);
  opacity: 1;
}

#research .card, #awards .card  { background: #faf8f4; }
#projects .card, #volunteering .card { background: #f0ebe3; }

.card h3 {
  font-size: 0.92rem;
  color: var(--text);
  font-weight: 500;
  line-height: 1.55;
  margin-bottom: 14px;
}

.card-year {
  font-family: var(--mono);
  font-size: 0.75rem;
  color: var(--accent);
  letter-spacing: 1.5px;
  margin-bottom: 10px;
}

.card-meta {
  font-size: 0.8rem;
  color: var(--muted);
  display: flex;
  align-items: center;
  gap: 6px;
}

/* project card */
.card-top {
  display: flex;
  justify-content: space-between;
  align-items: center;
  margin-bottom: 16px;
}
.card-icon { font-size: 1.5rem; color: var(--accent); }
.card-link {
  font-size: 1.2rem;
  color: var(--muted);
  transition: color var(--ease);
}
.card-link:hover { color: var(--accent); opacity: 1; }

.card p {
  font-size: 0.86rem;
  color: var(--muted);
  line-height: 1.6;
  margin-bottom: 18px;
}

.tag {
  font-family: var(--mono);
  font-size: 0.73rem;
  color: var(--accent);
  background: var(--accent-bg);
  padding: 3px 10px;
  border-radius: 20px;
}

/* ── Background / Bio ────────────────────────── */
#bio {
  max-width: 640px;
}
#bio p {
  font-size: 1.05rem;
  color: var(--text);
  line-height: 1.85;
  margin-bottom: 1.2em;
}
#bio p:last-child { margin-bottom: 0; }

/* ── Awards ──────────────────────────────────── */
.award-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(260px, 1fr));
  gap: 14px;
}

.award-item {
  display: flex;
  align-items: baseline;
  gap: 14px;
  padding: 18px 22px;
  border: 1px solid var(--border);
  border-radius: var(--radius);
  background: var(--surface);
}

.award-year {
  font-family: var(--mono);
  font-size: 0.78rem;
  color: var(--accent);
  letter-spacing: 1px;
  flex-shrink: 0;
}

.award-name {
  font-size: 0.9rem;
  color: var(--text);
  line-height: 1.4;
}

/* ── Contact ─────────────────────────────────── */
#contact { text-align: center; }
.email-btn { margin: 0 auto 40px; font-size: 0.95rem; padding: 13px 26px; }

#social-links {
  display: flex;
  justify-content: center;
  gap: 30px;
  margin-top: 8px;
}
#social-links a {
  font-size: 1.35rem;
  color: var(--muted);
  transition: color var(--ease);
}
#social-links a:hover { color: var(--accent); opacity: 1; }

/* ── Footer ──────────────────────────────────── */
#footer {
  text-align: center;
  padding: 28px 20px;
  font-family: var(--mono);
  font-size: 0.78rem;
  color: var(--muted);
  border-top: 1px solid var(--border);
  background: rgba(250, 248, 244, 0.93);
}

/* ── Skip link ───────────────────────────────── */
#skip-link {
  position: absolute;
  top: -100px;
  left: 16px;
  padding: 10px 18px;
  background: var(--accent);
  color: #fff;
  font-family: var(--mono);
  font-size: 0.85rem;
  border-radius: var(--radius);
  z-index: 9999;
  transition: top 0.2s;
}
#skip-link:focus { top: 16px; }

/* ── Focus styles ────────────────────────────── */
:focus-visible {
  outline: 2px solid var(--accent);
  outline-offset: 3px;
  border-radius: 3px;
}
/* Cards are <a> tags — give them a clear focus ring too */
.card:focus-visible { outline-offset: 2px; }

/* ── Reduced motion ──────────────────────────── */
@media (prefers-reduced-motion: reduce) {
  *, *::before, *::after {
    animation-duration: 0.01ms !important;
    animation-iteration-count: 1 !important;
    transition-duration: 0.01ms !important;
    scroll-behavior: auto !important;
  }
}

/* ── Responsive ──────────────────────────────── */
@media (max-width: 768px) {
  #header    { padding: 16px 24px; }
  #links     { gap: 20px; }
  #hero      { padding: 100px 24px 60px; }
  .section-inner { padding: 0 24px; }
  .cards     { grid-template-columns: 1fr; }
}