/* ============================================================
   Personal profile — academic-clean style
   White page, centered column, blue links, quiet typography.
   ============================================================ */

:root {
  --color-text: #1f2328;
  --color-muted: #6b7280;
  --color-faint: #9ca3af;
  --color-link: #0b6cff;
  --color-link-hover: #0353d1;
  --color-border: #e5e7eb;
  --color-callout-bg: #eef4ff;
  --color-callout-edge: #0b6cff;

  --font-sans: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto,
    "Helvetica Neue", Arial, "PingFang SC", sans-serif;

  --space-1: 8px;
  --space-2: 16px;
  --space-3: 24px;
  --space-4: 32px;
  --space-6: 48px;

  --duration: 150ms;
}

* { box-sizing: border-box; }

html { scroll-behavior: smooth; }

body {
  margin: 0;
  font-family: var(--font-sans);
  font-size: 1.0625rem;
  line-height: 1.7;
  color: var(--color-text);
  background: #fff;
  -webkit-font-smoothing: antialiased;
}

.page {
  max-width: 760px;
  margin-inline: auto;
  padding: var(--space-6) var(--space-3) var(--space-4);
}

a { color: var(--color-link); text-decoration: none; }
a:hover { color: var(--color-link-hover); text-decoration: underline; }

p { margin: 0 0 var(--space-2); }

.skip-link {
  position: absolute;
  left: -9999px;
  background: var(--color-link);
  color: #fff;
  padding: var(--space-1) var(--space-2);
}
.skip-link:focus { left: 0; top: 0; z-index: 10; }

:is(a, button):focus-visible {
  outline: 2px solid var(--color-link);
  outline-offset: 2px;
  border-radius: 6px;
}

/* ---------- Header ---------- */
.profile-header {
  display: flex;
  align-items: center;
  gap: var(--space-4);
  margin-bottom: var(--space-6);
}

.avatar {
  flex: none;
  width: 148px;
  height: 148px;
  border-radius: 50%;
  background: linear-gradient(135deg, #0b6cff, #66a3ff);
  color: #fff;
  font-size: 3.5rem;
  font-weight: 700;
  display: flex;
  align-items: center;
  justify-content: center;
  user-select: none;
}

.profile-id h1 {
  margin: 0;
  font-size: clamp(1.9rem, 1.5rem + 2vw, 2.5rem);
  font-weight: 800;
  letter-spacing: -0.02em;
  line-height: 1.1;
}

.profile-title {
  margin: 6px 0 0;
  font-size: 1.125rem;
  color: var(--color-muted);
}

.profile-loc {
  margin: 2px 0 0;
  font-size: 0.9375rem;
  color: var(--color-faint);
}

/* Contact pills */
.contact-row {
  display: flex;
  flex-wrap: wrap;
  gap: var(--space-1);
  margin-top: var(--space-2);
}

.pill {
  display: inline-block;
  font: inherit;
  font-size: 0.9375rem;
  font-weight: 500;
  color: var(--color-link);
  background: #fff;
  border: 1px solid var(--color-border);
  border-radius: 8px;
  padding: 6px 16px;
  cursor: pointer;
  transition: border-color var(--duration) ease, background-color var(--duration) ease;
}
.pill:hover {
  border-color: var(--color-link);
  background: #f7faff;
  text-decoration: none;
}
.pill[aria-expanded="true"] {
  border-color: var(--color-link);
  background: var(--color-callout-bg);
}

/* Reveal panel */
.reveal-panel {
  display: flex;
  flex-wrap: wrap;
  align-items: baseline;
  gap: var(--space-1) var(--space-2);
  margin-top: var(--space-2);
  padding: 10px 14px;
  border: 1px solid var(--color-border);
  border-radius: 8px;
  background: #fafbfc;
  font-size: 0.9375rem;
  animation: fade-in 200ms ease;
}
.reveal-panel[hidden] { display: none; }

.reveal-value {
  font-weight: 600;
  font-variant-numeric: tabular-nums;
}

.reveal-actions {
  display: inline-flex;
  gap: var(--space-2);
}
.reveal-actions button {
  font: inherit;
  color: var(--color-link);
  background: none;
  border: none;
  padding: 0;
  cursor: pointer;
}
.reveal-actions button:hover { color: var(--color-link-hover); text-decoration: underline; }

.reveal-note { color: #047857; }

@keyframes fade-in {
  from { opacity: 0; transform: translateY(4px); }
  to { opacity: 1; transform: translateY(0); }
}

/* ---------- Sections ---------- */
section { margin-bottom: var(--space-6); }

h2 {
  font-size: 0.9375rem;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.12em;
  color: var(--color-muted);
  border-bottom: 1px solid var(--color-border);
  padding-bottom: var(--space-1);
  margin: 0 0 var(--space-3);
}

/* Callout */
.callout {
  background: var(--color-callout-bg);
  border-left: 3px solid var(--color-callout-edge);
  border-radius: 0 8px 8px 0;
  padding: var(--space-2) var(--space-3);
  margin-top: var(--space-3);
}
.callout p { margin: 0; }

/* ---------- Entries (experience & projects) ---------- */
.entry { margin-bottom: var(--space-4); }
.entry:last-child { margin-bottom: 0; }

.entry-head {
  display: flex;
  align-items: baseline;
  justify-content: space-between;
  gap: var(--space-2);
  flex-wrap: wrap;
}

.entry h3 {
  margin: 0;
  font-size: 1.125rem;
  font-weight: 700;
  letter-spacing: -0.01em;
}

.entry-meta,
.entry-tag {
  font-size: 0.875rem;
  color: var(--color-faint);
  white-space: nowrap;
}

.entry-link { font-size: 0.9375rem; font-weight: 500; white-space: nowrap; }

.entry-sub {
  font-size: 0.9375rem;
  color: var(--color-muted);
  margin: 2px 0 var(--space-1);
}

.entry p { margin: 4px 0 0; }

.entry ul {
  margin: var(--space-1) 0 0;
  padding-left: 1.25rem;
}
.entry li { margin-bottom: 6px; }

/* ---------- Skills ---------- */
.skills-list {
  list-style: none;
  margin: 0;
  padding: 0;
}
.skills-list li { margin-bottom: var(--space-1); }

/* ---------- Footer ---------- */
.site-footer {
  border-top: 1px solid var(--color-border);
  padding-top: var(--space-2);
  font-size: 0.875rem;
  color: var(--color-faint);
}
.site-footer p { margin: 0; }

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

/* ---------- Responsive ---------- */
@media (max-width: 600px) {
  .page { padding-top: var(--space-4); }
  .profile-header {
    flex-direction: column;
    align-items: flex-start;
    gap: var(--space-3);
  }
  .avatar { width: 112px; height: 112px; font-size: 2.75rem; }
  .entry-head { flex-direction: column; gap: 2px; }
}