/* ============================================================
   NSR — Personal Website: Shared Styles
   Aesthetic: Warm academic minimalism — parchment, deep teal,
   ink black. Cormorant Garamond + DM Sans pairing.
   ============================================================ */

@import url('https://fonts.googleapis.com/css2?family=Cormorant+Garamond:ital,wght@0,300;0,400;0,500;0,600;1,300;1,400;1,500&family=DM+Sans:ital,wght@0,300;0,400;0,500;1,300&family=DM+Mono:wght@300;400&display=swap');

/* ── CSS Variables ── */
:root {
  --bg:          #F7F4EE;
  --bg-card:     #FFFFFF;
  --text:        #1A1814;
  --text-muted:  #6B6560;
  --text-subtle: #9E9890;
  --accent:      #1E5B5E;
  --accent-warm: #8B5E3C;
  --accent-light:#E8F2F2;
  --border:      #E2DDD6;
  --border-light:#EDE9E2;
  --shadow:      rgba(30,30,20,0.08);
  --shadow-md:   rgba(30,30,20,0.14);
  --nav-h:       68px;
  --radius:      4px;
  --radius-lg:   10px;
  --transition:  0.28s cubic-bezier(0.4,0,0.2,1);
}

[data-theme="dark"] {
  --bg:          #111210;
  --bg-card:     #1A1A17;
  --text:        #EDE9E1;
  --text-muted:  #9A958C;
  --text-subtle: #6A6560;
  --accent:      #4AACB0;
  --accent-warm: #C4895A;
  --accent-light:#0F2E30;
  --border:      #2A2A24;
  --border-light:#222219;
  --shadow:      rgba(0,0,0,0.3);
  --shadow-md:   rgba(0,0,0,0.5);
}

/* ── Reset ── */
*, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }
html { scroll-behavior: smooth; font-size: 16px; }
body {
  font-family: 'DM Sans', sans-serif;
  background: var(--bg);
  color: var(--text);
  line-height: 1.7;
  transition: background var(--transition), color var(--transition);
  overflow-x: hidden;
  /* Prevent any child from blowing out the viewport */
  max-width: 100vw;
}

img { max-width: 100%; height: auto; display: block; }
a { color: var(--accent); text-decoration: none; transition: color var(--transition); }
a:hover { color: var(--accent-warm); }

/* ── Typography ── */
.serif { font-family: 'Cormorant Garamond', serif; }
.mono  { font-family: 'DM Mono', monospace; }

h1, h2, h3, h4 {
  font-family: 'Cormorant Garamond', serif;
  line-height: 1.2;
  font-weight: 500;
}
h1 { font-size: clamp(2rem, 6vw, 4rem); letter-spacing: -0.02em; }
h2 { font-size: clamp(1.6rem, 4vw, 2.8rem); }
h3 { font-size: clamp(1.2rem, 3vw, 1.8rem); }
h4 { font-size: clamp(1rem, 2.5vw, 1.2rem); }

p { font-size: 1rem; font-weight: 300; color: var(--text-muted); }
.lead { font-size: clamp(1rem, 2.5vw, 1.15rem); line-height: 1.8; }

/* ── Layout ── */
.container {
  width: 100%;
  max-width: 1100px;
  margin: 0 auto;
  padding: 0 clamp(1rem, 5vw, 3rem);
}
.container-narrow {
  width: 100%;
  max-width: 740px;
  margin: 0 auto;
  padding: 0 clamp(1rem, 5vw, 2rem);
}

section { padding: 5rem 0; }

.section-label {
  font-family: 'DM Mono', monospace;
  font-size: 0.7rem;
  letter-spacing: 0.18em;
  text-transform: uppercase;
  color: var(--accent);
  margin-bottom: 1rem;
  display: flex;
  align-items: center;
  gap: 0.75rem;
  flex-wrap: wrap;
}
.section-label::after {
  content: '';
  display: block;
  height: 1px;
  width: 40px;
  background: var(--accent);
  opacity: 0.5;
  flex-shrink: 0;
}

/* ── Navigation ── */
.nav {
  position: fixed;
  top: 0; left: 0; right: 0;
  height: var(--nav-h);
  z-index: 100;
  transition: background var(--transition), box-shadow var(--transition);
}
.nav.scrolled {
  background: color-mix(in srgb, var(--bg) 88%, transparent);
  backdrop-filter: blur(12px);
  -webkit-backdrop-filter: blur(12px);
  box-shadow: 0 1px 0 var(--border);
}
.nav-inner {
  max-width: 1100px;
  margin: 0 auto;
  padding: 0 clamp(1rem, 5vw, 3rem);
  height: 100%;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 1rem;
}
.nav-logo {
  font-family: 'Cormorant Garamond', serif;
  font-size: 1.4rem;
  font-weight: 500;
  color: var(--text) !important;
  letter-spacing: 0.04em;
  flex-shrink: 0;
}
.nav-logo span { color: var(--accent); }

.nav-links {
  display: flex;
  align-items: center;
  gap: 2rem;
  list-style: none;
}
.nav-links a {
  font-size: 0.85rem;
  font-weight: 400;
  color: var(--text-muted);
  letter-spacing: 0.04em;
  position: relative;
  padding-bottom: 2px;
  white-space: nowrap;
}
.nav-links a::after {
  content: '';
  position: absolute;
  bottom: 0; left: 0;
  width: 0; height: 1px;
  background: var(--accent);
  transition: width var(--transition);
}
.nav-links a:hover, .nav-links a.active { color: var(--text); }
.nav-links a:hover::after, .nav-links a.active::after { width: 100%; }

.nav-actions { display: flex; align-items: center; gap: 0.75rem; flex-shrink: 0; }

/* Theme toggle */
.theme-btn {
  width: 36px; height: 36px;
  border: 1px solid var(--border);
  border-radius: 50%;
  background: transparent;
  cursor: pointer;
  display: flex; align-items: center; justify-content: center;
  color: var(--text-muted);
  flex-shrink: 0;
  transition: border-color var(--transition), color var(--transition);
}
.theme-btn:hover { border-color: var(--accent); color: var(--accent); }

/* Hamburger */
.hamburger {
  display: none;
  flex-direction: column;
  gap: 5px;
  background: none;
  border: none;
  cursor: pointer;
  padding: 6px;
  flex-shrink: 0;
}
.hamburger span {
  display: block;
  width: 22px; height: 1.5px;
  background: var(--text);
  transition: transform var(--transition), opacity var(--transition);
}
.hamburger.open span:nth-child(1) { transform: translateY(6.5px) rotate(45deg); }
.hamburger.open span:nth-child(2) { opacity: 0; }
.hamburger.open span:nth-child(3) { transform: translateY(-6.5px) rotate(-45deg); }

/* Mobile nav drawer */
.mobile-nav {
  position: fixed;
  top: var(--nav-h); right: 0;
  width: min(320px, 100vw);
  height: calc(100vh - var(--nav-h));
  background: var(--bg-card);
  border-left: 1px solid var(--border);
  z-index: 99;
  padding: 2rem;
  transform: translateX(100%);
  transition: transform var(--transition);
  overflow-y: auto;
}
.mobile-nav.open { transform: translateX(0); }
.mobile-nav ul { list-style: none; }
.mobile-nav ul li { border-bottom: 1px solid var(--border-light); }
.mobile-nav ul a {
  display: block;
  padding: 1rem 0;
  font-size: 1.1rem;
  color: var(--text);
  font-family: 'Cormorant Garamond', serif;
}

/* ── Buttons ── */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 0.5rem;
  padding: 0.7rem 1.5rem;
  border-radius: var(--radius);
  font-size: 0.85rem;
  font-weight: 400;
  letter-spacing: 0.04em;
  transition: all var(--transition);
  cursor: pointer;
  border: 1px solid transparent;
  white-space: nowrap;
}
.btn-primary {
  background: var(--accent);
  color: #fff;
  border-color: var(--accent);
}
.btn-primary:hover { background: transparent; color: var(--accent); }
.btn-outline {
  background: transparent;
  color: var(--text);
  border-color: var(--border);
}
.btn-outline:hover { border-color: var(--accent); color: var(--accent); }
.btn-sm { padding: 0.45rem 1rem; font-size: 0.8rem; }

/* ── Cards ── */
.card {
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: var(--radius-lg);
  padding: 2rem;
  transition: box-shadow var(--transition), transform var(--transition), border-color var(--transition);
}
.card:hover {
  box-shadow: 0 8px 32px var(--shadow-md);
  transform: translateY(-2px);
  border-color: var(--accent);
}

/* ── Divider ── */
.divider { border: none; height: 1px; background: var(--border); margin: 3rem 0; }

/* ── Tags ── */
.tag {
  display: inline-block;
  padding: 0.2rem 0.75rem;
  background: var(--accent-light);
  color: var(--accent);
  border-radius: 99px;
  font-size: 0.75rem;
  font-weight: 400;
  letter-spacing: 0.04em;
}

/* ── Footer ── */
footer {
  border-top: 1px solid var(--border);
  padding: 3rem 0;
  margin-top: 4rem;
}
.footer-inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  flex-wrap: wrap;
  gap: 1.5rem;
  max-width: 1100px;
  margin: 0 auto;
  padding: 0 clamp(1rem, 5vw, 3rem);
}
.footer-links { display: flex; gap: 1.5rem; flex-wrap: wrap; }
.footer-links a { font-size: 0.82rem; color: var(--text-muted); }
.footer-links a:hover { color: var(--accent); }
.footer-copy { font-size: 0.78rem; color: var(--text-subtle); }

/* ── Scroll animations ──
   Only hide when JS has confirmed it's running (html.js-ready class).
   Without this guard, a JS failure leaves everything invisible.
── */
.reveal { opacity: 1; transform: none; }

.js-ready .reveal {
  opacity: 0;
  transform: translateY(22px);
  transition: opacity 0.65s ease, transform 0.65s ease;
}
.js-ready .reveal.visible {
  opacity: 1;
  transform: translateY(0);
}
.js-ready .reveal-delay-1 { transition-delay: 0.1s; }
.js-ready .reveal-delay-2 { transition-delay: 0.2s; }
.js-ready .reveal-delay-3 { transition-delay: 0.3s; }
.js-ready .reveal-delay-4 { transition-delay: 0.45s; }

/* ── Page top spacer ── */
.page-top { padding-top: calc(var(--nav-h) + 3rem); }

/* ── Timeline ── */
.timeline { position: relative; padding-left: 2rem; }
.timeline::before {
  content: '';
  position: absolute;
  left: 0; top: 0; bottom: 0;
  width: 1px;
  background: var(--border);
}
.timeline-item { position: relative; padding-bottom: 2.5rem; }
.timeline-item::before {
  content: '';
  position: absolute;
  left: -2rem; top: 0.35rem;
  width: 8px; height: 8px;
  border-radius: 50%;
  background: var(--accent);
  transform: translateX(-3.5px);
}
.timeline-date {
  font-family: 'DM Mono', monospace;
  font-size: 0.72rem;
  letter-spacing: 0.1em;
  color: var(--accent);
  margin-bottom: 0.4rem;
}

/* ── Grid helpers ── */
.grid-2 {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(min(100%, 280px), 1fr));
  gap: 1.5rem;
}
.grid-3 {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(min(100%, 240px), 1fr));
  gap: 1.5rem;
}

/* ── Two-column section layout (collapses on mobile) ── */
.two-col {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 3rem;
  align-items: start;
}
.two-col-wide {
  display: grid;
  grid-template-columns: 2fr 1.2fr;
  gap: 3rem;
  align-items: start;
}

/* ── Social icons row ── */
.social-row { display: flex; gap: 1rem; flex-wrap: wrap; }
.social-link {
  display: inline-flex;
  align-items: center;
  gap: 0.5rem;
  padding: 0.45rem 1rem;
  border: 1px solid var(--border);
  border-radius: 99px;
  font-size: 0.8rem;
  color: var(--text-muted);
  transition: all var(--transition);
  white-space: nowrap;
}
.social-link:hover {
  border-color: var(--accent);
  color: var(--accent);
  background: var(--accent-light);
}

/* ── Blockquote ── */
blockquote {
  border-left: 3px solid var(--accent);
  padding: 1rem 1.5rem;
  margin: 2rem 0;
  background: var(--accent-light);
  border-radius: 0 var(--radius) var(--radius) 0;
}
blockquote p { color: var(--text); font-style: italic; font-size: 1.05rem; }

/* ── Code blocks — no horizontal overflow ── */
.code-block {
  white-space: pre-wrap;
  word-break: break-word;
  overflow-x: auto;
}

/* ─────────────────────────────────────────────
   RESPONSIVE BREAKPOINTS
───────────────────────────────────────────── */

/* ── Tablet & below (≤900px) — collapse nav links ── */
@media (max-width: 900px) {
  .nav-links { display: none; }
  .nav-actions .theme-btn { display: none; }
  .hamburger { display: flex; }
}

/* ── Tablet (≤768px) ── */
@media (max-width: 768px) {
  section { padding: 3.5rem 0; }

  /* All two-column grids collapse to single column */
  .two-col,
  .two-col-wide,
  .hero-grid {
    grid-template-columns: 1fr !important;
    gap: 2rem !important;
  }

  /* Hero: photo stacks above text on mobile */
  .hero-grid .photo-col { order: -1; }
}

/* ── Mobile (≤600px) ── */
@media (max-width: 600px) {
  .grid-2, .grid-3 { grid-template-columns: 1fr; }

  /* Shrink card padding */
  .card { padding: 1.25rem; }

  /* CTA button rows wrap and stretch */
  .cta-row {
    flex-direction: column;
    align-items: stretch;
  }
  .cta-row .btn { text-align: center; }

  /* Social row wraps */
  .social-row { gap: 0.6rem; }
}

/* ── Small mobile (≤400px) ── */
@media (max-width: 400px) {
  h1 { font-size: 1.9rem; }
  .tag { font-size: 0.7rem; padding: 0.15rem 0.55rem; }
  blockquote p { font-size: 0.95rem; }
}