/* ===========================
   RESET & ROOT
=========================== */
*, *::before, *::after {
  box-sizing: border-box;
  margin: 0;
  padding: 0;
}

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

:root {
  --bg:     #F9F8F5;
  --text:   #1A1A1A;
  --muted:  #6B6B6B;
  --accent: #1E3A5F;
  --border: #E5E2DC;
  --white:  #FFFFFF;

  --serif: 'Lora', Georgia, serif;
  --sans:  'Inter', system-ui, -apple-system, sans-serif;

  --max:   680px;
  --nav-h: 60px;
}

html {
  font-size: 16px;
  scroll-behavior: smooth;
}

body {
  background: var(--bg);
  color: var(--text);
  font-family: var(--sans);
  font-weight: 400;
  line-height: 1.6;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}

a { color: inherit; }

/* ===========================
   NAV
=========================== */
nav {
  position: fixed;
  top: 0; left: 0; right: 0;
  height: var(--nav-h);
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 0 2rem;
  background: rgba(249, 248, 245, 0.92);
  backdrop-filter: blur(8px);
  -webkit-backdrop-filter: blur(8px);
  border-bottom: 1px solid var(--border);
  z-index: 100;
  transition: background 0.35s ease, border-color 0.35s ease;
}

.nav-brand {
  font-family: var(--serif);
  font-size: 1rem;
  font-weight: 500;
  color: var(--text);
  text-decoration: none;
  letter-spacing: -0.01em;
  transition: color 0.35s ease;
}

.nav-links {
  display: flex;
  gap: 2rem;
}

.nav-links a {
  font-size: 0.85rem;
  color: var(--muted);
  text-decoration: none;
  letter-spacing: 0.01em;
  transition: color 0.2s ease;
}

.nav-links a:hover,
.nav-links a.active {
  color: var(--text);
}

/* Transparent nav over dark hero images */
nav.nav-transparent {
  background: transparent;
  border-bottom-color: transparent;
  backdrop-filter: none;
  -webkit-backdrop-filter: none;
}

nav.nav-transparent .nav-brand {
  color: rgba(255, 255, 255, 0.92);
}

nav.nav-transparent .nav-links a {
  color: rgba(255, 255, 255, 0.65);
}

nav.nav-transparent .nav-links a:hover,
nav.nav-transparent .nav-links a.active {
  color: #fff;
}

/* ===========================
   HERO (landing — carousel)
=========================== */
.hero {
  position: relative;
  min-height: 100vh;
  display: flex;
  align-items: center;
  padding: var(--nav-h) 2rem 4rem;
  overflow: hidden;
}

.hero-bg {
  position: absolute;
  inset: 0;
  z-index: 0;
}

.hero-slide {
  position: absolute;
  inset: 0;
  background-size: cover;
  background-position: center;
  opacity: 0;
  transition: opacity 2s ease;
  will-change: opacity;
}

.hero-slide.active {
  opacity: 1;
}

.hero-overlay {
  position: absolute;
  inset: 0;
  background: linear-gradient(
    135deg,
    rgba(0, 0, 0, 0.58) 0%,
    rgba(0, 0, 0, 0.35) 50%,
    rgba(0, 0, 0, 0.25) 100%
  );
  z-index: 1;
}

.hero-inner {
  position: relative;
  z-index: 2;
  max-width: var(--max);
  width: 100%;
  animation: fadeUp 0.6s ease-out 0.2s both;
}

@keyframes fadeUp {
  from { opacity: 0; transform: translateY(12px); }
  to   { opacity: 1; transform: translateY(0); }
}

.eyebrow {
  font-size: 0.78rem;
  letter-spacing: 0.1em;
  text-transform: uppercase;
  color: rgba(255, 255, 255, 0.55);
  margin-bottom: 1.25rem;
}

.hero h1 {
  font-family: var(--serif);
  font-size: clamp(2.75rem, 7vw, 5rem);
  font-weight: 400;
  line-height: 1.05;
  letter-spacing: -0.025em;
  color: #fff;
  margin-bottom: 0.75rem;
}

.hero .subtitle {
  font-size: 0.975rem;
  color: rgba(255, 255, 255, 0.82);
  font-weight: 500;
  margin-bottom: 1.5rem;
  letter-spacing: 0.01em;
}

.hero .tagline {
  font-size: 1.1rem;
  color: rgba(255, 255, 255, 0.6);
  max-width: 420px;
  line-height: 1.75;
  margin-bottom: 2.75rem;
}

.cta-row {
  display: flex;
  gap: 1rem;
  align-items: center;
  flex-wrap: wrap;
}

/* Buttons — hero variants (white on dark) */
.hero .btn-primary {
  display: inline-block;
  padding: 0.7rem 1.5rem;
  background: rgba(255, 255, 255, 0.92);
  color: var(--text);
  text-decoration: none;
  font-size: 0.875rem;
  font-weight: 500;
  letter-spacing: 0.01em;
  transition: background 0.2s ease;
}

.hero .btn-primary:hover { background: #fff; }

.hero .btn-ghost {
  display: inline-block;
  padding: 0.7rem 1.5rem;
  border: 1px solid rgba(255, 255, 255, 0.3);
  color: rgba(255, 255, 255, 0.9);
  text-decoration: none;
  font-size: 0.875rem;
  font-weight: 400;
  transition: border-color 0.2s ease;
}

.hero .btn-ghost:hover { border-color: rgba(255, 255, 255, 0.6); }

/* Buttons — default variants (for non-hero use) */
.btn-primary {
  display: inline-block;
  padding: 0.7rem 1.5rem;
  background: var(--accent);
  color: var(--white);
  text-decoration: none;
  font-size: 0.875rem;
  font-weight: 500;
  letter-spacing: 0.01em;
  transition: opacity 0.2s ease;
}

.btn-primary:hover { opacity: 0.82; }

.btn-ghost {
  display: inline-block;
  padding: 0.7rem 1.5rem;
  border: 1px solid var(--border);
  color: var(--text);
  text-decoration: none;
  font-size: 0.875rem;
  font-weight: 400;
  transition: border-color 0.2s ease;
}

.btn-ghost:hover { border-color: var(--muted); }

/* ===========================
   HIGHLIGHT (landing — paper)
=========================== */
.section-highlight {
  padding: 4.5rem 2rem;
  border-top: 1px solid var(--border);
}

.section-highlight h2 {
  font-family: var(--serif);
  font-size: 1.35rem;
  font-weight: 400;
  line-height: 1.45;
  letter-spacing: -0.015em;
  margin-bottom: 0.75rem;
  margin-top: 0.75rem;
}

.section-highlight p {
  color: var(--muted);
  font-size: 0.925rem;
  line-height: 1.75;
  max-width: 500px;
  margin-bottom: 1.25rem;
}

/* ===========================
   SHARED UTILITIES
=========================== */
.container {
  max-width: var(--max);
  margin: 0 auto;
}

.overline {
  display: block;
  font-size: 0.7rem;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  color: var(--muted);
  margin-bottom: 1.5rem;
}

.arrow-link {
  color: var(--accent);
  text-decoration: none;
  font-size: 0.9rem;
  font-weight: 500;
}

.arrow-link:hover { text-decoration: underline; }

/* ===========================
   PAGE HEADER (inner pages)
=========================== */
.page-head {
  padding: calc(var(--nav-h) + 4rem) 2rem 3rem;
  border-bottom: 1px solid var(--border);
}

.page-head h1 {
  font-family: var(--serif);
  font-size: clamp(1.75rem, 5vw, 3rem);
  font-weight: 400;
  line-height: 1.15;
  letter-spacing: -0.02em;
}

.page-head p {
  margin-top: 0.75rem;
  color: var(--muted);
  font-size: 0.925rem;
  line-height: 1.7;
  max-width: 420px;
}

/* ===========================
   TIMELINE (journey page)
=========================== */
.section-timeline {
  padding: 4rem 2rem 6rem;
}

.timeline {
  position: relative;
  padding-left: 2.5rem;
}

.timeline::before {
  content: '';
  position: absolute;
  left: 3px;
  top: 0.5rem;
  bottom: 2rem;
  width: 1px;
  background: var(--border);
}

.timeline-entry {
  position: relative;
  padding-bottom: 5rem;
}

.timeline-entry:last-child {
  padding-bottom: 0;
}

.timeline-dot {
  position: absolute;
  left: -2.5rem;
  top: 0.45rem;
  width: 7px;
  height: 7px;
  background: var(--accent);
  border-radius: 50%;
}

.timeline-date {
  font-size: 0.75rem;
  color: var(--muted);
  letter-spacing: 0.06em;
  text-transform: uppercase;
  margin-bottom: 0.5rem;
}

.timeline-content h3 {
  font-family: var(--serif);
  font-size: 1.25rem;
  font-weight: 400;
  line-height: 1.4;
  letter-spacing: -0.01em;
  margin-bottom: 1rem;
}

.timeline-content p {
  font-size: 0.95rem;
  line-height: 1.9;
  color: var(--muted);
  max-width: 580px;
}

.timeline-content p + p {
  margin-top: 1rem;
}

.timeline-content a {
  color: var(--accent);
  text-decoration: none;
}

.timeline-content a:hover {
  text-decoration: underline;
}

.timeline-img {
  width: 100%;
  max-width: 500px;
  height: auto;
  margin-top: 2rem;
  display: block;
}

/* ===========================
   OFFLINE PAGE
=========================== */
.offline-hero {
  position: relative;
  height: 70vh;
  min-height: 400px;
  overflow: hidden;
}

.offline-hero img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  display: block;
}

.offline-hero-overlay {
  position: absolute;
  inset: 0;
  background: linear-gradient(
    to top,
    rgba(0, 0, 0, 0.45) 0%,
    rgba(0, 0, 0, 0.15) 50%,
    rgba(0, 0, 0, 0.1) 100%
  );
}

.offline-hero-text {
  position: absolute;
  bottom: 3rem;
  left: 2rem;
  z-index: 2;
}

.offline-hero-text h1 {
  font-family: var(--serif);
  font-size: clamp(2rem, 5vw, 3.5rem);
  color: #fff;
  font-weight: 400;
  letter-spacing: -0.02em;
}

.offline-body {
  padding: 4rem 2rem 3rem;
}

.offline-social {
  display: flex;
  flex-wrap: wrap;
  gap: 1.25rem 1.75rem;
  margin-top: 1.75rem;
}

.offline-social a {
  display: flex;
  align-items: center;
  gap: 0.5rem;
  color: var(--muted);
  text-decoration: none;
  font-size: 0.85rem;
  transition: color 0.2s ease;
}

.offline-social a:hover {
  color: var(--text);
}

.offline-text {
  font-size: 0.975rem;
  line-height: 1.9;
  color: var(--text);
  max-width: 560px;
}

.offline-text + .offline-text {
  margin-top: 1rem;
}

.offline-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 4px;
}

.offline-grid img {
  width: 100%;
  aspect-ratio: 3 / 2;
  object-fit: cover;
  display: block;
}

/* ===========================
   EDUCATION SECTION
=========================== */
.section-edu {
  padding: 2.5rem 2rem 5rem;
  border-top: 1px solid var(--border);
}

.edu-block { margin-top: 0.5rem; }

.edu-school-row {
  display: flex;
  justify-content: space-between;
  align-items: baseline;
  margin-bottom: 0.75rem;
  gap: 1rem;
}

.edu-school {
  font-weight: 600;
  font-size: 0.975rem;
}

.edu-loc {
  font-size: 0.78rem;
  color: var(--muted);
  white-space: nowrap;
}

.edu-degrees {
  display: flex;
  flex-direction: column;
  gap: 0.5rem;
  margin-bottom: 0.75rem;
}

.edu-degree {
  display: flex;
  justify-content: space-between;
  align-items: baseline;
  gap: 1rem;
}

.degree-name {
  font-size: 0.875rem;
  color: var(--text);
}

.degree-detail {
  font-size: 0.78rem;
  color: var(--muted);
  white-space: nowrap;
}

.edu-honors {
  font-size: 0.8rem;
  color: var(--muted);
  margin-top: 0.25rem;
}

/* ===========================
   ABOUT SECTION
=========================== */
.section-about {
  padding: 3rem 2rem 5rem;
}

.bio {
  margin-bottom: 3rem;
}

.bio p {
  font-size: 0.975rem;
  line-height: 1.85;
  color: var(--text);
}

.bio p + p { margin-top: 1.25rem; }

.subsec {
  margin-bottom: 2.75rem;
}

.skills-wrap {
  display: flex;
  flex-wrap: wrap;
  gap: 0.5rem;
}

.skill {
  display: inline-block;
  padding: 0.3rem 0.8rem;
  background: var(--white);
  border: 1px solid var(--border);
  font-size: 0.82rem;
  color: var(--text);
}

.activity-list {
  display: flex;
  flex-direction: column;
  gap: 0.75rem;
}

.activity-row {
  display: flex;
  justify-content: space-between;
  align-items: baseline;
  gap: 1rem;
}

.activity-name {
  font-size: 0.9rem;
  font-weight: 500;
}

.activity-date {
  font-size: 0.78rem;
  color: var(--muted);
  white-space: nowrap;
}

.pub-list {
  list-style: none;
  display: flex;
  flex-direction: column;
  gap: 1.5rem;
}

.pub-item {
  display: flex;
  flex-direction: column;
  gap: 0.3rem;
}

.pub-title {
  font-size: 0.9rem;
  color: var(--text);
  text-decoration: none;
  line-height: 1.55;
}

.pub-title:hover {
  color: var(--accent);
  text-decoration: underline;
}

.pub-meta {
  font-size: 0.78rem;
  color: var(--muted);
  letter-spacing: 0.02em;
}

.contact-links {
  display: flex;
  flex-direction: column;
  gap: 0.65rem;
}

/* ===========================
   FOOTER
=========================== */
footer {
  border-top: 1px solid var(--border);
  padding: 2rem;
}

footer .container {
  text-align: center;
}

footer p {
  font-size: 0.78rem;
  color: var(--muted);
}

footer a {
  color: var(--muted);
  text-decoration: none;
}

footer a:hover { color: var(--text); }

/* ===========================
   RESPONSIVE
=========================== */
@media (max-width: 600px) {
  nav { padding: 0 1.25rem; }
  .nav-links { gap: 1rem; font-size: 0.8rem; }

  .hero              { padding-left: 1.25rem; padding-right: 1.25rem; }
  .section-highlight { padding-left: 1.25rem; padding-right: 1.25rem; }
  .page-head         { padding-left: 1.25rem; padding-right: 1.25rem; }
  .section-about     { padding-left: 1.25rem; padding-right: 1.25rem; padding-bottom: 3rem; }
  .section-edu       { padding-left: 1.25rem; padding-right: 1.25rem; }
  .section-timeline  { padding-left: 1.25rem; padding-right: 1.25rem; padding-bottom: 3rem; }

  .edu-school-row { flex-direction: column; gap: 0.2rem; }
  .edu-degree     { flex-direction: column; gap: 0.1rem; }
  .activity-row   { flex-direction: column; gap: 0.15rem; }
  .degree-detail  { white-space: normal; }

  .timeline { padding-left: 1.75rem; }
  .timeline-dot { left: -1.75rem; }
  .timeline-entry { padding-bottom: 3rem; }
  .timeline-img { max-width: 100%; }

  .offline-hero { height: 50vh; }
  .offline-hero-text { bottom: 2rem; left: 1.25rem; }
  .offline-body { padding-left: 1.25rem; padding-right: 1.25rem; }
  .offline-grid { grid-template-columns: 1fr; }
  .offline-social { gap: 1rem; }
}