/* ============================================
   Section-Specific Styles
   ============================================ */

/* === Navigation === */
.nav {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  z-index: 100;
  padding: var(--space-4) 0;
  transition: background-color var(--transition-base),
              backdrop-filter var(--transition-base),
              border-color var(--transition-base);
  border-bottom: 1px solid transparent;
}

.nav--scrolled {
  background-color: var(--color-nav-bg);
  backdrop-filter: saturate(180%) blur(20px);
  -webkit-backdrop-filter: saturate(180%) blur(20px);
  border-bottom-color: var(--color-border-subtle);
}

.nav__container {
  display: flex;
  align-items: center;
  justify-content: space-between;
  max-width: var(--container-max);
  margin: 0 auto;
  padding: 0 var(--container-padding);
}

.nav__logo {
  font-size: var(--text-lg);
  font-weight: var(--weight-bold);
  letter-spacing: var(--tracking-tight);
  color: var(--color-text-primary);
}

.nav__links {
  display: flex;
  align-items: center;
  gap: var(--space-8);
}

.nav__link {
  font-size: var(--text-xs);
  font-weight: var(--weight-medium);
  color: var(--color-text-secondary);
  text-transform: uppercase;
  letter-spacing: var(--tracking-wider);
  transition: color var(--transition-fast);
}

.nav__link:hover,
.nav__link--active {
  color: var(--color-text-primary);
}

.nav__actions {
  display: flex;
  align-items: center;
  gap: var(--space-4);
}

.nav__theme-toggle {
  width: 36px;
  height: 36px;
  display: flex;
  align-items: center;
  justify-content: center;
  border-radius: var(--radius-full);
  color: var(--color-text-secondary);
  transition: color var(--transition-fast), background-color var(--transition-fast);
}

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

.nav__theme-toggle svg {
  width: 18px;
  height: 18px;
}

/* Hamburger Menu Button */
.nav__hamburger {
  display: none;
  flex-direction: column;
  justify-content: center;
  gap: 5px;
  width: 36px;
  height: 36px;
  padding: 6px;
  border-radius: var(--radius-sm);
  transition: background-color var(--transition-fast);
}

.nav__hamburger:hover {
  background-color: var(--color-bg-tertiary);
}

.nav__hamburger span {
  display: block;
  width: 100%;
  height: 2px;
  background-color: var(--color-text-primary);
  border-radius: 1px;
  transition: transform var(--transition-base), opacity var(--transition-base);
}

.nav__hamburger--open span:first-child {
  transform: translateY(7px) rotate(45deg);
}

.nav__hamburger--open span:nth-child(2) {
  opacity: 0;
}

.nav__hamburger--open span:last-child {
  transform: translateY(-7px) rotate(-45deg);
}

/* Mobile Menu Overlay */
.nav__overlay {
  display: none;
  position: fixed;
  inset: 0;
  background-color: var(--color-overlay);
  z-index: 99;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  gap: var(--space-8);
}

.nav__overlay--open {
  display: flex;
}

.nav__overlay .nav__link {
  font-size: var(--text-2xl);
  letter-spacing: var(--tracking-wide);
}

/* === Hero Section === */
.hero {
  min-height: 100vh;
  display: flex;
  align-items: center;
  justify-content: center;
  position: relative;
  overflow: hidden;
}

.hero::before {
  content: '';
  position: absolute;
  top: -20%;
  right: -10%;
  width: 60%;
  height: 60%;
  background: radial-gradient(circle, var(--color-accent) 0%, transparent 70%);
  opacity: 0.03;
  pointer-events: none;
}

[data-theme="dark"] .hero::before {
  opacity: 0.05;
}

.hero__content {
  text-align: center;
  max-width: 720px;
  padding: 0 var(--container-padding);
}

.hero__photo {
  margin-bottom: var(--space-6);
  display: flex;
  justify-content: center;
}

.hero__photo img {
  width: 120px;
  height: 120px;
  border-radius: 50%;
  object-fit: cover;
  border: 3px solid var(--color-border);
  box-shadow: 0 4px 16px var(--color-card-shadow);
}

.hero__badge {
  display: inline-flex;
  align-items: center;
  gap: var(--space-2);
  padding: var(--space-1) var(--space-4);
  background-color: var(--color-bg-tertiary);
  border-radius: var(--radius-full);
  font-size: var(--text-xs);
  font-weight: var(--weight-medium);
  color: var(--color-text-secondary);
  margin-bottom: var(--space-6);
}

.hero__badge svg {
  width: 12px;
  height: 12px;
}

.hero__name {
  font-size: var(--text-hero);
  font-weight: var(--weight-bold);
  line-height: var(--leading-tight);
  letter-spacing: var(--tracking-tight);
  color: var(--color-text-primary);
}

.hero__title {
  font-size: var(--text-xl);
  font-weight: var(--weight-regular);
  color: var(--color-text-secondary);
  margin-top: var(--space-3);
}

.hero__divider {
  height: 1px;
  background-color: var(--color-border);
  margin: var(--space-8) auto;
  /* width animated from 0 to 48px */
}

.hero__summary {
  font-size: var(--text-lg);
  color: var(--color-text-secondary);
  line-height: var(--leading-relaxed);
  max-width: 560px;
  margin: 0 auto;
}

.hero__social {
  display: flex;
  justify-content: center;
  gap: var(--space-6);
  margin-top: var(--space-8);
}

.hero__social-link {
  display: flex;
  align-items: center;
  justify-content: center;
  width: 40px;
  height: 40px;
  border-radius: var(--radius-full);
  color: var(--color-text-tertiary);
  transition: color var(--transition-fast), background-color var(--transition-fast);
}

.hero__social-link:hover {
  color: var(--color-accent);
  background-color: var(--color-accent-subtle);
}

.hero__social-link svg {
  width: 20px;
  height: 20px;
}

.hero__scroll {
  position: absolute;
  bottom: var(--space-8);
  left: 50%;
  transform: translateX(-50%);
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: var(--space-2);
  color: var(--color-text-tertiary);
}

.hero__scroll-text {
  font-size: var(--text-xs);
  letter-spacing: var(--tracking-wider);
  text-transform: uppercase;
}

.hero__scroll-icon svg {
  width: 16px;
  height: 16px;
}

/* === Timeline === */
.timeline {
  position: relative;
  max-width: 1000px;
  margin: 0 auto;
}

.timeline__line {
  position: absolute;
  left: 50%;
  top: 0;
  bottom: 0;
  width: 2px;
  background-color: var(--color-timeline-line);
  transform-origin: top center;
  transform: translateX(-50%);
}

.timeline__item {
  display: flex;
  align-items: flex-start;
  position: relative;
  margin-bottom: var(--space-12);
}

.timeline__item:last-child {
  margin-bottom: 0;
}

/* Left items: card on left, node center */
.timeline__item--left {
  flex-direction: row-reverse;
}

.timeline__item--left .timeline__card {
  text-align: right;
  margin-right: var(--space-8);
  margin-left: 0;
}

.timeline__item--right .timeline__card {
  text-align: left;
  margin-left: var(--space-8);
  margin-right: 0;
}

.timeline__node {
  position: absolute;
  left: 50%;
  transform: translateX(-50%);
  width: 56px;
  height: 56px;
  border-radius: 50%;
  background-color: var(--color-bg-secondary);
  border: 1px solid var(--color-border);
  box-shadow: 0 2px 8px var(--color-card-shadow);
  display: flex;
  align-items: center;
  justify-content: center;
  z-index: 2;
  flex-shrink: 0;
}

.timeline__node--active {
  border-color: var(--color-accent);
  position: absolute;
}

.timeline__node-icon {
  width: 32px;
  height: 32px;
  border-radius: 50%;
  color: var(--color-accent);
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: var(--text-sm);
  font-weight: var(--weight-bold);
}

.timeline__node-icon:not(:has(img)) {
  background-color: var(--color-accent-subtle);
}

.timeline__node-logo {
  width: 28px;
  height: 28px;
  object-fit: contain;
  border-radius: 4px;
}

.timeline__card {
  width: calc(50% - 52px);
  background-color: var(--color-bg-secondary);
  border: 1px solid var(--color-border-subtle);
  border-radius: var(--radius-lg);
  padding: var(--space-8);
  box-shadow: 0 1px 3px var(--color-card-shadow);
  transition: transform var(--transition-base), box-shadow var(--transition-base);
}

.timeline__card:hover {
  transform: translateY(-2px);
  box-shadow: 0 8px 25px var(--color-card-hover-shadow);
}

.timeline__period {
  font-size: var(--text-sm);
  font-weight: var(--weight-medium);
  color: var(--color-text-tertiary);
}

.timeline__role {
  font-size: var(--text-xl);
  font-weight: var(--weight-semibold);
  color: var(--color-text-primary);
  margin-top: var(--space-1);
}

.timeline__company {
  font-size: var(--text-sm);
  color: var(--color-text-secondary);
  margin-top: var(--space-1);
}

.timeline__description {
  font-size: var(--text-base);
  color: var(--color-text-secondary);
  line-height: var(--leading-relaxed);
  margin-top: var(--space-4);
}

.timeline__highlights {
  margin-top: var(--space-4);
  display: flex;
  flex-direction: column;
  gap: var(--space-2);
}

.timeline__highlights li {
  font-size: var(--text-sm);
  color: var(--color-text-secondary);
  line-height: var(--leading-normal);
  padding-left: var(--space-4);
  position: relative;
}

.timeline__highlights li::before {
  content: '';
  position: absolute;
  left: 0;
  top: 8px;
  width: 6px;
  height: 6px;
  border-radius: 50%;
  background-color: var(--color-accent);
}

.timeline__item--left .timeline__highlights li {
  padding-left: 0;
  padding-right: var(--space-4);
}

.timeline__item--left .timeline__highlights li::before {
  left: auto;
  right: 0;
}

/* === Education === */
.education__list {
  max-width: 800px;
  margin: 0 auto;
  display: flex;
  flex-direction: column;
  gap: var(--space-6);
}

.education__card {
  background-color: var(--color-bg-secondary);
  border: 1px solid var(--color-border-subtle);
  border-left: 4px solid var(--color-accent);
  border-radius: var(--radius-lg);
  padding: var(--space-8);
  padding-left: var(--space-10);
  transition: transform var(--transition-base), box-shadow var(--transition-base);
}

.education__card:hover {
  transform: translateY(-2px);
  box-shadow: 0 8px 25px var(--color-card-hover-shadow);
}

.education__institution {
  font-size: var(--text-sm);
  font-weight: var(--weight-medium);
  color: var(--color-text-tertiary);
  text-transform: uppercase;
  letter-spacing: var(--tracking-wide);
}

.education__header {
  display: flex;
  align-items: center;
  gap: var(--space-4);
  margin-top: var(--space-2);
  flex-wrap: wrap;
}

.education__degree {
  font-size: var(--text-2xl);
  font-weight: var(--weight-semibold);
  color: var(--color-text-primary);
}

.education__period {
  display: inline-block;
  padding: var(--space-1) var(--space-3);
  background-color: var(--color-bg-tertiary);
  border-radius: var(--radius-full);
  font-size: var(--text-xs);
  font-weight: var(--weight-medium);
  color: var(--color-text-secondary);
}

.education__gpa {
  display: inline-block;
  padding: var(--space-1) var(--space-3);
  background-color: var(--color-accent-subtle);
  border-radius: var(--radius-full);
  font-size: var(--text-xs);
  font-weight: var(--weight-semibold);
  color: var(--color-accent);
}

.education__description {
  font-size: var(--text-base);
  color: var(--color-text-secondary);
  line-height: var(--leading-relaxed);
  margin-top: var(--space-4);
}

/* === Projects === */
.projects__grid {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: var(--space-8);
}

.project-card {
  background-color: var(--color-bg-secondary);
  border: 1px solid var(--color-border-subtle);
  border-radius: var(--radius-lg);
  overflow: hidden;
  transition: transform var(--transition-base), box-shadow var(--transition-base);
}

.project-card:hover {
  transform: translateY(-2px);
  box-shadow: 0 8px 25px var(--color-card-hover-shadow);
}

.project-card__image {
  height: 160px;
  background: linear-gradient(135deg, var(--color-bg-tertiary) 0%, var(--color-border) 100%);
  position: relative;
}

.project-card__link-icon {
  position: absolute;
  top: var(--space-4);
  right: var(--space-4);
  width: 32px;
  height: 32px;
  display: flex;
  align-items: center;
  justify-content: center;
  background-color: var(--color-bg-secondary);
  border-radius: var(--radius-full);
  color: var(--color-text-tertiary);
  opacity: 0;
  transform: translateY(4px);
  transition: opacity var(--transition-fast), transform var(--transition-fast);
}

.project-card:hover .project-card__link-icon {
  opacity: 1;
  transform: translateY(0);
}

.project-card__link-icon svg {
  width: 14px;
  height: 14px;
}

.project-card__body {
  padding: var(--space-6);
}

.project-card__title {
  font-size: var(--text-xl);
  font-weight: var(--weight-semibold);
  color: var(--color-text-primary);
}

.project-card__description {
  font-size: var(--text-base);
  color: var(--color-text-secondary);
  line-height: var(--leading-relaxed);
  margin-top: var(--space-2);
  display: -webkit-box;
  -webkit-line-clamp: 3;
  -webkit-box-orient: vertical;
  overflow: hidden;
}

.project-card__tags {
  display: flex;
  flex-wrap: wrap;
  gap: var(--space-2);
  margin-top: var(--space-4);
}

.project-card__tag {
  padding: var(--space-1) var(--space-3);
  background-color: var(--color-bg-tertiary);
  border-radius: var(--radius-full);
  font-size: var(--text-xs);
  font-weight: var(--weight-medium);
  color: var(--color-text-secondary);
}

.project-card--static {
  cursor: default;
}

.project-card--static:hover {
  transform: none;
  box-shadow: 0 2px 8px var(--color-card-shadow);
}

/* === Certifications === */
.certs__grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: var(--space-6);
}

.cert-card {
  background-color: var(--color-bg-secondary);
  border: 1px solid var(--color-border-subtle);
  border-radius: var(--radius-md);
  padding: var(--space-6);
  display: flex;
  gap: var(--space-4);
  align-items: flex-start;
  transition: transform var(--transition-base), box-shadow var(--transition-base);
}

.cert-card:hover {
  transform: translateY(-2px);
  box-shadow: 0 8px 25px var(--color-card-hover-shadow);
}

.cert-card__icon {
  width: 40px;
  height: 40px;
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
  flex-shrink: 0;
  font-size: var(--text-sm);
  font-weight: var(--weight-bold);
  color: white;
}

.cert-card__icon--blue { background-color: #2563EB; }
.cert-card__icon--green { background-color: #059669; }
.cert-card__icon--purple { background-color: #7C3AED; }
.cert-card__icon--orange { background-color: #EA580C; }

.cert-card__info {
  flex: 1;
  min-width: 0;
}

.cert-card__issuer {
  font-size: var(--text-xs);
  font-weight: var(--weight-medium);
  color: var(--color-text-tertiary);
  text-transform: uppercase;
  letter-spacing: var(--tracking-wide);
}

.cert-card__name {
  font-size: var(--text-base);
  font-weight: var(--weight-medium);
  color: var(--color-text-primary);
  margin-top: var(--space-1);
}

.cert-card__year {
  font-size: var(--text-sm);
  color: var(--color-text-tertiary);
  margin-top: var(--space-1);
}

/* === Awards === */
.awards__group {
  max-width: 800px;
  margin: 0 auto;
  margin-bottom: var(--space-12);
}

.awards__group:last-child {
  margin-bottom: 0;
}

.awards__group-title {
  font-size: var(--text-sm);
  font-weight: var(--weight-semibold);
  color: var(--color-text-tertiary);
  text-transform: uppercase;
  letter-spacing: var(--tracking-wider);
  padding-bottom: var(--space-4);
  border-bottom: 1px solid var(--color-border);
  margin-bottom: var(--space-2);
}

.award-row {
  display: flex;
  align-items: center;
  gap: var(--space-4);
  padding: var(--space-4) var(--space-2);
  border-bottom: 1px solid var(--color-border-subtle);
  border-radius: var(--radius-sm);
  transition: background-color var(--transition-fast);
}

.award-row:hover {
  background-color: var(--color-bg-tertiary);
}

.award-row:last-child {
  border-bottom: none;
}

.award-row__icon {
  width: 44px;
  height: 44px;
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
  flex-shrink: 0;
  font-size: var(--text-lg);
}

.award-row__icon--gold { background-color: #FEF3C7; color: #D97706; }
.award-row__icon--blue { background-color: #DBEAFE; color: #2563EB; }
.award-row__icon--green { background-color: #D1FAE5; color: #059669; }

[data-theme="dark"] .award-row__icon--gold { background-color: #451a03; color: #FBBF24; }
[data-theme="dark"] .award-row__icon--blue { background-color: #1e3a5f; color: #60A5FA; }
[data-theme="dark"] .award-row__icon--green { background-color: #064e3b; color: #34D399; }

.award-row__content {
  flex: 1;
  min-width: 0;
}

.award-row__title {
  font-size: var(--text-base);
  font-weight: var(--weight-medium);
  color: var(--color-text-primary);
}

.award-row__description {
  font-size: var(--text-sm);
  color: var(--color-text-secondary);
  margin-top: var(--space-1);
}

.award-row__meta {
  display: flex;
  flex-direction: column;
  align-items: flex-end;
  gap: var(--space-1);
  flex-shrink: 0;
}

.award-row__year {
  font-size: var(--text-sm);
  color: var(--color-text-tertiary);
}

.award-row__badge {
  display: inline-block;
  padding: var(--space-1) var(--space-3);
  border-radius: var(--radius-full);
  font-size: var(--text-xs);
  font-weight: var(--weight-medium);
  white-space: nowrap;
}

.award-row__badge--gold {
  background-color: #FEF3C7;
  color: #92400E;
}

.award-row__badge--blue {
  background-color: #DBEAFE;
  color: #1E40AF;
}

.award-row__badge--green {
  background-color: #D1FAE5;
  color: #065F46;
}

[data-theme="dark"] .award-row__badge--gold { background-color: #451a03; color: #FBBF24; }
[data-theme="dark"] .award-row__badge--blue { background-color: #1e3a5f; color: #60A5FA; }
[data-theme="dark"] .award-row__badge--green { background-color: #064e3b; color: #34D399; }

/* === Languages === */
.languages__list {
  max-width: 600px;
  margin: 0 auto;
  display: flex;
  flex-direction: column;
  gap: var(--space-10);
}

.language-bar__header {
  display: flex;
  justify-content: space-between;
  align-items: baseline;
  margin-bottom: var(--space-3);
}

.language-bar__name {
  font-size: var(--text-lg);
  font-weight: var(--weight-semibold);
  color: var(--color-text-primary);
}

.language-bar__level {
  font-size: var(--text-sm);
  color: var(--color-text-secondary);
}

.language-bar__track {
  width: 100%;
  height: 8px;
  background-color: var(--color-bg-tertiary);
  border-radius: var(--radius-full);
  overflow: hidden;
}

.language-bar__fill {
  height: 100%;
  background: linear-gradient(90deg, var(--color-accent), var(--color-accent-hover));
  border-radius: var(--radius-full);
}

/* === Footer === */
.footer {
  padding: var(--space-16) 0;
  border-top: 1px solid var(--color-border);
}

.footer__content {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: var(--space-6);
  text-align: center;
}

.footer__name {
  font-size: var(--text-lg);
  font-weight: var(--weight-semibold);
  color: var(--color-text-primary);
}

.footer__social {
  display: flex;
  gap: var(--space-4);
}

.footer__social-link {
  width: 36px;
  height: 36px;
  display: flex;
  align-items: center;
  justify-content: center;
  border-radius: var(--radius-full);
  color: var(--color-text-tertiary);
  transition: color var(--transition-fast);
}

.footer__social-link:hover {
  color: var(--color-accent);
}

.footer__social-link svg {
  width: 18px;
  height: 18px;
}

.footer__meta {
  font-size: var(--text-xs);
  color: var(--color-text-tertiary);
}