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

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

/* === THEME TOKENS === */
:root {
  --bg: #ffffff;
  --bg-nav: rgba(255, 255, 255, 0.72);
  --text-primary: #1d1d1f;
  --text-secondary: #6e6e73;
  --text-tertiary: #86868b;
  --accent: #0071e3;
  --border: #d2d2d7;
  --card-bg: #f5f5f7;
  --card-hover-shadow: 0 8px 24px rgba(0, 0, 0, 0.10);
  --nav-height: 52px;
  --color-on-accent: #ffffff;
  --img-fallback-bg: #1c2b3a;
}

[data-theme="dark"] {
  --bg: #1c1c1e;
  --bg-nav: rgba(28, 28, 30, 0.72);
  --text-primary: #f5f5f7;
  --text-secondary: #aeaeb2;
  --text-tertiary: #636366;
  --accent: #2997ff;
  --border: #38383a;
  --card-bg: #2c2c2e;
  --card-hover-shadow: 0 8px 24px rgba(0, 0, 0, 0.40);
}

/* === BODY === */
body {
  background-color: var(--bg);
  color: var(--text-primary);
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, sans-serif;
  line-height: 1.6;
  transition: background-color 0.3s ease, color 0.3s ease;
}

/* === TYPOGRAPHY === */
h1, h2, h3 {
  font-weight: 600;
  letter-spacing: -0.02em;
  line-height: 1.1;
}

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

a:hover {
  text-decoration: underline;
}

ul {
  list-style: none;
}

/* === NAV === */
#main-nav {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  z-index: 100;
  height: var(--nav-height);
  background: transparent;
  transition: background 0.3s ease, backdrop-filter 0.3s ease, border-color 0.3s ease;
}

#main-nav.scrolled {
  background: var(--bg-nav);
  backdrop-filter: blur(20px);
  -webkit-backdrop-filter: blur(20px);
  border-bottom: 1px solid var(--border);
}

#main-nav.scrolled .nav-logo {
  color: var(--text-primary);
}

#main-nav.scrolled .nav-link {
  color: var(--text-secondary);
}

.nav-inner {
  max-width: 1080px;
  margin: 0 auto;
  padding: 0 24px;
  height: 100%;
  display: flex;
  align-items: center;
  gap: 32px;
}

.nav-logo {
  font-weight: 700;
  font-size: 1rem;
  color: #ffffff;
  letter-spacing: 0.05em;
  margin-right: auto;
  text-decoration: none;
}

.nav-logo:hover {
  text-decoration: none;
}

.nav-links {
  display: flex;
  gap: 0;
}

.nav-link {
  display: inline-block;
  padding: 6px 14px;
  font-size: 0.85rem;
  color: rgba(255, 255, 255, 0.85);
  font-weight: 400;
  position: relative;
  transition: color 0.2s ease;
}

.nav-link::after {
  content: '';
  position: absolute;
  bottom: 0;
  left: 14px;
  right: 14px;
  height: 2px;
  background: var(--accent);
  transform: scaleX(0);
  transition: transform 0.2s ease;
}

.nav-link:hover {
  color: #ffffff;
  text-decoration: none;
}

.nav-link.active {
  color: #ffffff;
  font-weight: 500;
}

#main-nav.scrolled .nav-link:hover {
  color: var(--text-primary);
}

#main-nav.scrolled .nav-link.active {
  color: var(--text-primary);
}

.nav-link.active::after {
  transform: scaleX(1);
}

/* === THEME TOGGLE === */
.theme-toggle {
  background: none;
  border: none;
  cursor: pointer;
  color: var(--text-secondary);
  padding: 6px;
  display: flex;
  align-items: center;
  justify-content: center;
  border-radius: 50%;
  transition: color 0.2s ease, background 0.2s ease;
}

.theme-toggle:hover {
  color: var(--text-primary);
  background: var(--card-bg);
}

/* Show sun in dark mode, moon in light mode */
[data-theme="light"] .icon-moon { display: none; }
[data-theme="dark"] .icon-sun { display: none; }

/* === RESPONSIVE: hide nav links on small screens === */
@media (max-width: 680px) {
  .nav-links { display: none; }
}

/* === HERO === */
#hero {
  height: 100vh;
  display: flex;
  align-items: center;
  justify-content: center;
  text-align: center;
  padding: 0 24px;
  position: relative;
  overflow: hidden;
}

.hero-bg {
  position: absolute;
  inset: 0;
  background-image: url('images/hero-bg.png');
  background-size: cover;
  background-position: center;
  background-color: var(--img-fallback-bg);
  filter: blur(0px);
  transform: scale(1.05);
  transition: filter 0.1s linear;
  z-index: 0;
}

.hero-bg::after {
  content: '';
  position: absolute;
  inset: 0;
  background: rgba(0, 0, 0, 0.45);
}

.hero-content {
  position: relative;
  z-index: 1;
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 20px;
}

.hero-name {
  font-size: clamp(3rem, 8vw, 6rem);
  font-weight: 700;
  color: var(--text-primary);
  letter-spacing: -0.04em;
}

.hero-tagline {
  font-size: clamp(1rem, 2.5vw, 1.4rem);
  color: var(--text-secondary);
  font-weight: 400;
  max-width: 480px;
}

.hero-scroll-cta {
  margin-top: 32px;
  color: var(--text-tertiary);
  transition: color 0.2s ease, transform 0.2s ease;
  animation: bounce 2s ease-in-out infinite;
}

.hero-scroll-cta:hover {
  color: var(--text-primary);
  text-decoration: none;
}

/* Hero text always white — sits over dark overlay */
.hero-name,
.hero-tagline,
.hero-scroll-cta {
  color: var(--color-on-accent);
}

@keyframes bounce {
  0%, 100% { transform: translateY(0); }
  50% { transform: translateY(6px); }
}

/* === SECTIONS === */
.section {
  padding: 100px 24px;
  border-top: 1px solid var(--border);
}

.section-inner {
  max-width: 800px;
  margin: 0 auto;
}

.section-label {
  display: block;
  font-size: 0.75rem;
  font-weight: 600;
  letter-spacing: 0.1em;
  text-transform: uppercase;
  color: var(--accent);
  margin-bottom: 12px;
}

.section-title {
  font-size: clamp(2rem, 4vw, 2.8rem);
  color: var(--text-primary);
  margin-bottom: 40px;
}

.section-body {
  font-size: 1.1rem;
  color: var(--text-secondary);
  line-height: 1.8;
  max-width: 640px;
}

/* === TIMELINE === */
.timeline {
  display: flex;
  flex-direction: column;
  gap: 0;
  position: relative;
  padding-left: 28px;
}

.timeline::before {
  content: '';
  position: absolute;
  left: 0;
  top: 8px;
  bottom: 8px;
  width: 1px;
  background: var(--border);
}

.timeline-item {
  position: relative;
  padding-bottom: 48px;
  padding-left: 32px;
}

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

.timeline-item::before {
  content: '';
  position: absolute;
  left: -4px;
  top: 8px;
  width: 9px;
  height: 9px;
  border-radius: 50%;
  background: var(--accent);
  border: 2px solid var(--bg);
}

.timeline-meta {
  margin-bottom: 8px;
}

.timeline-date {
  font-size: 0.8rem;
  color: var(--text-tertiary);
  font-weight: 500;
  letter-spacing: 0.02em;
}

.timeline-card {
  background: var(--card-bg);
  border-radius: 12px;
  padding: 20px 24px;
  transition: transform 0.2s ease, box-shadow 0.2s ease;
}

.timeline-card:hover {
  transform: translateY(-2px);
  box-shadow: var(--card-hover-shadow);
}

.timeline-org {
  font-size: 1rem;
  font-weight: 600;
  color: var(--text-primary);
  margin-bottom: 4px;
}

.timeline-role {
  font-size: 0.9rem;
  color: var(--text-secondary);
  margin-bottom: 4px;
}

.timeline-detail {
  font-size: 0.8rem;
  color: var(--text-tertiary);
}

.timeline-bullets {
  margin-top: 12px;
  display: flex;
  flex-direction: column;
  gap: 6px;
}

.timeline-bullets li {
  font-size: 0.875rem;
  color: var(--text-secondary);
  padding-left: 14px;
  position: relative;
}

.timeline-bullets li::before {
  content: '·';
  position: absolute;
  left: 0;
  color: var(--accent);
  font-weight: 700;
}

/* === CARD GRID === */
.card-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(280px, 1fr));
  gap: 20px;
}

/* === PROJECT CARDS === */
.project-card {
  background: var(--card-bg);
  border-radius: 16px;
  padding: 0;
  display: flex;
  flex-direction: column;
  gap: 0;
  transition: transform 0.2s ease, box-shadow 0.2s ease;
  cursor: pointer;
  overflow: hidden;
}

.project-card:hover {
  transform: translateY(-2px);
  box-shadow: var(--card-hover-shadow);
}

.card-img {
  height: 160px;
  background-size: cover;
  background-position: center;
  background-color: var(--img-fallback-bg);
  position: relative;
  flex-shrink: 0;
}

.card-img::after {
  content: '';
  position: absolute;
  inset: 0;
  background: linear-gradient(to bottom, transparent 50%, rgba(0, 0, 0, 0.2));
}

.card-body {
  padding: 24px;
  display: flex;
  flex-direction: column;
  gap: 12px;
  flex: 1;
}

.card-title {
  font-size: 1.1rem;
  font-weight: 600;
  color: var(--text-primary);
}

.card-desc {
  font-size: 0.9rem;
  color: var(--text-secondary);
  line-height: 1.6;
  flex: 1;
}

.card-tags {
  display: flex;
  flex-wrap: wrap;
  gap: 6px;
  margin-top: 4px;
}

.tag {
  font-size: 0.75rem;
  font-weight: 500;
  color: var(--accent);
  background: color-mix(in srgb, var(--accent) 10%, transparent);
  padding: 3px 10px;
  border-radius: 99px;
}

/* === LEADERSHIP CARDS === */
.leadership-card {
  background: var(--card-bg);
  border-radius: 16px;
  padding: 0;
  display: flex;
  flex-direction: column;
  gap: 0;
  transition: transform 0.2s ease, box-shadow 0.2s ease;
  cursor: pointer;
  overflow: hidden;
}

.leadership-card:hover {
  transform: translateY(-2px);
  box-shadow: var(--card-hover-shadow);
}

.card-role {
  font-size: 0.8rem;
  color: var(--text-tertiary);
  font-weight: 500;
}

.card-stats {
  display: flex;
  gap: 24px;
  margin-top: 8px;
}

.stat {
  display: flex;
  flex-direction: column;
  gap: 2px;
}

.stat-value {
  font-size: 1.4rem;
  font-weight: 700;
  color: var(--text-primary);
  letter-spacing: -0.02em;
}

.stat-label {
  font-size: 0.72rem;
  color: var(--text-tertiary);
  text-transform: uppercase;
  letter-spacing: 0.06em;
}

/* === AWARDS === */
.awards-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 48px;
}

@media (max-width: 600px) {
  .awards-grid { grid-template-columns: 1fr; }
}

.awards-col-title {
  font-size: 0.85rem;
  font-weight: 600;
  color: var(--text-tertiary);
  text-transform: uppercase;
  letter-spacing: 0.08em;
  margin-bottom: 20px;
}

.awards-list {
  display: flex;
  flex-direction: column;
  gap: 20px;
}

.award-item {
  display: flex;
  flex-direction: row;
  align-items: center;
  gap: 12px;
  padding-bottom: 20px;
  border-bottom: 1px solid var(--border);
}

.award-item:last-child {
  border-bottom: none;
  padding-bottom: 0;
}

.award-info {
  display: flex;
  flex-direction: column;
  gap: 3px;
  flex: 1;
  min-width: 0;
}

.award-name {
  font-size: 0.9rem;
  font-weight: 500;
  color: var(--text-primary);
}

.award-detail {
  font-size: 0.8rem;
  color: var(--text-tertiary);
}

.award-actions {
  display: flex;
  align-items: center;
  gap: 8px;
  flex-shrink: 0;
}

.award-view-btn {
  font-size: 0.75rem;
  font-weight: 500;
  color: var(--text-secondary);
  background: none;
  border: 1px solid var(--border);
  border-radius: 6px;
  padding: 3px 10px;
  cursor: pointer;
  transition: color 120ms ease, border-color 120ms ease;
}

.award-view-btn:hover {
  color: var(--text-primary);
  border-color: var(--text-secondary);
}

.award-verify-link {
  font-size: 0.75rem;
  font-weight: 500;
  color: var(--accent);
  text-decoration: none;
}

.award-verify-link:hover {
  text-decoration: underline;
}

/* === CERT LIGHTBOX === */
#cert-overlay {
  position: fixed;
  inset: 0;
  background: rgba(0, 0, 0, 0.85);
  backdrop-filter: blur(8px);
  -webkit-backdrop-filter: blur(8px);
  z-index: 600;
  display: flex;
  align-items: center;
  justify-content: center;
  padding: 32px;
  opacity: 0;
  pointer-events: none;
  transition: opacity 200ms ease;
}

#cert-overlay.is-open {
  opacity: 1;
  pointer-events: auto;
}

#cert-overlay img {
  max-width: 100%;
  max-height: 100%;
  object-fit: contain;
  border-radius: 8px;
  box-shadow: 0 24px 64px rgba(0, 0, 0, 0.5);
  transform: scale(0.96);
  opacity: 0;
  transition: transform 200ms ease, opacity 200ms ease;
}

#cert-overlay.is-open img {
  transform: scale(1);
  opacity: 1;
}

#cert-close {
  position: absolute;
  top: 18px;
  right: 18px;
  width: 36px;
  height: 36px;
  background: rgba(255, 255, 255, 0.15);
  border: none;
  border-radius: 50%;
  cursor: pointer;
  font-size: 16px;
  display: flex;
  align-items: center;
  justify-content: center;
  color: #ffffff;
}

/* === CONTACT === */
.contact-inner {
  text-align: center;
}

.contact-inner .section-title {
  margin-bottom: 16px;
}

.contact-inner .section-body {
  margin: 0 auto 40px;
}

.contact-links {
  display: flex;
  gap: 24px;
  justify-content: center;
  flex-wrap: wrap;
}

.contact-link {
  font-size: 1rem;
  font-weight: 500;
  color: var(--accent);
  padding: 12px 24px;
  border: 1px solid var(--accent);
  border-radius: 99px;
  transition: background 0.2s ease, color 0.2s ease;
}

.contact-link:hover {
  background: var(--accent);
  color: var(--color-on-accent);
  text-decoration: none;
}

/* === FOOTER === */
footer {
  text-align: center;
  padding: 32px 24px;
  font-size: 0.8rem;
  color: var(--text-tertiary);
  border-top: 1px solid var(--border);
}

/* === REVEAL ANIMATION === */
.reveal {
  opacity: 0;
  transform: translateY(20px);
  transition: opacity 0.6s ease, transform 0.6s ease;
}

.reveal.visible {
  opacity: 1;
  transform: translateY(0);
}

/* === RESPONSIVE === */
@media (max-width: 768px) {
  .section { padding: 72px 20px; }
  .section-title { margin-bottom: 28px; }
  .timeline { padding-left: 16px; }
  .timeline-item { padding-left: 24px; }
  .card-grid { grid-template-columns: 1fr; }
  .card-stats { gap: 16px; }
  .contact-links { flex-direction: column; align-items: center; }
  .nav-inner { padding: 0 16px; }

}

@media (max-width: 480px) {
  .hero-name { letter-spacing: -0.03em; }
  .awards-grid { gap: 32px; }
}

/* === MODAL === */
#modal-overlay {
  position: fixed;
  inset: 0;
  background: rgba(0, 0, 0, 0.5);
  backdrop-filter: blur(12px);
  -webkit-backdrop-filter: blur(12px);
  z-index: 500;
  display: flex;
  align-items: center;
  justify-content: center;
  padding: 32px;
  opacity: 0;
  pointer-events: none;
  transition: opacity 220ms ease;
}

#modal-overlay.is-open {
  opacity: 1;
  pointer-events: auto;
}

#modal-box {
  position: relative;
  background: var(--card-bg);
  border-radius: 24px;
  max-width: 900px;
  width: 100%;
  height: 82vh;
  display: flex;
  overflow: hidden;
  box-shadow: 0 32px 80px rgba(0, 0, 0, 0.3);
  transform: scale(0.96);
  opacity: 0;
  transition: transform 220ms ease, opacity 220ms ease;
}

#modal-overlay.is-open #modal-box {
  transform: scale(1);
  opacity: 1;
}

#modal-img {
  width: 55%;
  flex-shrink: 0;
  background-size: cover;
  background-position: center;
  background-color: var(--img-fallback-bg);
}

#modal-content {
  flex: 1;
  min-height: 0;
  overflow-y: auto;
  padding: 44px 40px;
  display: flex;
  flex-direction: column;
}

#modal-tags {
  display: flex;
  gap: 6px;
  flex-wrap: wrap;
  margin-bottom: 18px;
}

#modal-title {
  font-size: 26px;
  font-weight: 700;
  color: var(--text-primary);
  margin-bottom: 8px;
  line-height: 1.2;
}

#modal-role {
  color: var(--text-secondary);
  font-size: 14px;
  margin-bottom: 20px;
}

#modal-desc p {
  font-size: 15px;
  line-height: 1.8;
  color: var(--text-primary);
  margin-bottom: 16px;
}

#modal-links {
  display: flex;
  flex-direction: row;
  flex-wrap: wrap;
  gap: 12px 24px;
  margin-top: auto;
  padding-top: 16px;
  border-top: 1px solid var(--border);
}

#modal-links a {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  color: var(--accent);
  font-size: 14px;
  font-weight: 500;
  text-decoration: none;
}

#modal-links a:hover {
  text-decoration: underline;
}

#modal-close {
  position: absolute;
  top: 18px;
  right: 18px;
  width: 36px;
  height: 36px;
  background: rgba(0, 0, 0, 0.08);
  border: none;
  border-radius: 50%;
  cursor: pointer;
  font-size: 16px;
  display: flex;
  align-items: center;
  justify-content: center;
  z-index: 10;
  color: var(--text-primary);
  transition: background 0.2s ease;
}

#modal-close:hover {
  background: rgba(0, 0, 0, 0.15);
}

@media (max-width: 768px) {
  #modal-overlay {
    padding: 16px 16px calc(16px + env(safe-area-inset-bottom, 0px));
    align-items: flex-end;
  }
  #modal-box {
    flex-direction: column;
    height: min(90vh, calc(100dvh - 32px - env(safe-area-inset-bottom, 0px)));
    border-radius: 20px;
  }
  #modal-img {
    width: 100%;
    height: 220px;
    flex-shrink: 0;
    background-size: contain;
    background-position: center;
    background-repeat: no-repeat;
  }
  #modal-content { padding: 28px 24px; }
  #modal-close { color: #ffffff; background: rgba(0, 0, 0, 0.3); }
}