/* ===========================
   Navigation
   =========================== */

.nav {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  height: var(--nav-height);
  z-index: 1000;
  transition: background-color var(--transition-base), backdrop-filter var(--transition-base);
}

.nav--scrolled {
  background-color: rgba(10, 10, 11, 0.85);
  backdrop-filter: blur(12px);
  -webkit-backdrop-filter: blur(12px);
  border-bottom: 1px solid var(--color-divider);
}

.nav__inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: 100%;
}

.nav__logo {
  font-family: var(--font-display);
  font-size: 1.25rem;
  color: var(--color-accent);
  letter-spacing: 0.05em;
  transition: opacity var(--transition-fast);
}

.nav__logo:hover {
  opacity: 0.8;
}

.nav__links {
  display: flex;
  gap: var(--space-md);
}

.nav__links a {
  font-size: var(--font-size-small);
  font-weight: 400;
  color: var(--color-text-secondary);
  transition: color var(--transition-fast);
  letter-spacing: 0.02em;
}

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

/* Mobile toggle */
.nav__toggle {
  display: none;
  flex-direction: column;
  justify-content: center;
  gap: 5px;
  width: 28px;
  height: 28px;
  background: none;
  border: none;
  cursor: pointer;
  padding: 0;
}

.nav__toggle span {
  display: block;
  width: 100%;
  height: 1.5px;
  background: var(--color-text-primary);
  transition: transform var(--transition-base), opacity var(--transition-fast);
}

.nav__toggle[aria-expanded="true"] span:nth-child(1) {
  transform: translateY(6.5px) rotate(45deg);
}

.nav__toggle[aria-expanded="true"] span:nth-child(2) {
  opacity: 0;
}

.nav__toggle[aria-expanded="true"] span:nth-child(3) {
  transform: translateY(-6.5px) rotate(-45deg);
}

/* Mobile overlay */
.nav__overlay {
  display: none;
  position: fixed;
  top: 0;
  left: 0;
  width: 100%;
  height: 100vh;
  background: rgba(10, 10, 11, 0.97);
  backdrop-filter: blur(20px);
  -webkit-backdrop-filter: blur(20px);
  justify-content: center;
  align-items: center;
  opacity: 0;
  transition: opacity var(--transition-base);
}

.nav__overlay.active {
  display: flex;
  opacity: 1;
}

.nav__overlay-links {
  text-align: center;
}

.nav__overlay-links li {
  margin-bottom: var(--space-md);
}

.nav__overlay-links a {
  font-family: var(--font-display);
  font-size: var(--font-size-h2);
  color: var(--color-text-primary);
  transition: color var(--transition-fast);
}

.nav__overlay-links a:hover {
  color: var(--color-accent);
}

@media (max-width: 640px) {
  .nav__links {
    display: none;
  }

  .nav__toggle {
    display: flex;
  }
}


/* ===========================
   Hero
   =========================== */

.hero {
  min-height: 100vh;
  display: flex;
  flex-direction: column;
  justify-content: center;
  align-items: center;
  position: relative;
  padding: var(--space-xl) 0;
}

.hero::before {
  display: none; /* Disable extra section divider */
}

.hero__content {
  text-align: center;
}

.hero__name {
  font-family: var(--font-display);
  font-size: var(--font-size-display);
  font-weight: 400;
  line-height: var(--line-height-tight);
  color: var(--color-text-primary);
  margin-bottom: var(--space-sm);
}

.hero__title {
  font-family: var(--font-body);
  font-size: var(--font-size-small);
  font-weight: 500;
  text-transform: uppercase;
  letter-spacing: 0.2em;
  color: var(--color-accent);
  margin-bottom: var(--space-md);
}

.hero__tagline {
  font-family: var(--font-display);
  font-size: var(--font-size-h2);
  font-weight: 400;
  line-height: var(--line-height-snug);
  color: var(--color-text-secondary);
  max-width: 600px;
  margin: 0 auto;
}

.hero__scroll {
  position: absolute;
  bottom: var(--space-md);
  left: 50%;
  transform: translateX(-50%);
}

.hero__scroll-line {
  width: 1px;
  height: 60px;
  background: linear-gradient(to bottom, var(--color-accent), transparent);
  animation: scrollPulse 2s ease-in-out infinite;
}

@keyframes scrollPulse {
  0%, 100% { opacity: 0.3; transform: scaleY(0.6); transform-origin: top; }
  50% { opacity: 1; transform: scaleY(1); transform-origin: top; }
}


/* ===========================
   About
   =========================== */

.about__content {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: var(--space-lg);
}

.about__photo-wrap {
  flex-shrink: 0;
}

.about__photo {
  width: 200px;
  height: 200px;
  border-radius: var(--radius-full);
  overflow: hidden;
  border: 2px solid var(--color-accent-muted);
  position: relative;
}

.about__photo img {
  width: 100%;
  height: 100%;
  object-fit: cover;
}


.about__text p {
  color: var(--color-text-secondary);
  margin-bottom: var(--space-sm);
  max-width: var(--max-width-reading);
}

.about__text p:last-child {
  margin-bottom: 0;
}

.about__text em {
  color: var(--color-text-primary);
  font-style: italic;
}


/* ===========================
   Philosophy
   =========================== */

.philosophy__list {
  display: flex;
  flex-direction: column;
  gap: 0;
}

.principle {
  display: flex;
  gap: var(--space-md);
  padding: var(--space-lg) 0;
  border-bottom: 1px solid var(--color-divider);
  align-items: flex-start;
}

.principle:last-child {
  border-bottom: none;
}

.principle__number {
  font-family: var(--font-display);
  font-size: var(--font-size-number);
  line-height: 0.8;
  color: var(--color-text-tertiary);
  flex-shrink: 0;
  width: 100px;
  text-align: right;
  padding-right: var(--space-sm);
  user-select: none;
  opacity: 0.4;
}

.principle__content {
  flex: 1;
  padding-top: 0.5rem;
}

.principle__heading {
  font-family: var(--font-display);
  font-size: var(--font-size-h2);
  font-weight: 400;
  line-height: var(--line-height-snug);
  color: var(--color-text-primary);
  margin-bottom: var(--space-sm);
  transition: color var(--transition-base);
}

.principle:hover .principle__heading {
  color: var(--color-accent);
}

.principle__body {
  font-size: var(--font-size-body);
  color: var(--color-text-secondary);
  line-height: var(--line-height-relaxed);
  max-width: 580px;
}

@media (max-width: 640px) {
  .principle {
    flex-direction: column;
    gap: var(--space-xs);
  }

  .principle__number {
    font-size: clamp(2.5rem, 6vw, 4rem);
    width: auto;
    text-align: left;
    padding-right: 0;
  }
}


/* ===========================
   Career Timeline
   =========================== */

.timeline {
  position: relative;
  padding-left: var(--space-lg);
  max-width: 700px;
}

/* Vertical line */
.timeline::before {
  content: '';
  position: absolute;
  left: 7px;
  top: 0;
  bottom: 0;
  width: 1px;
  background: linear-gradient(to bottom, var(--color-accent-muted), var(--color-divider));
}

.timeline__entry {
  position: relative;
  padding-bottom: var(--space-lg);
}

.timeline__entry:last-child {
  padding-bottom: 0;
}

.timeline__marker {
  position: absolute;
  left: calc(-1 * var(--space-lg) + 3px);
  top: 6px;
  width: 9px;
  height: 9px;
  border-radius: var(--radius-full);
  background: var(--color-bg-tertiary);
  border: 1.5px solid var(--color-accent);
}

.timeline__entry--advisory .timeline__marker {
  background: var(--color-accent);
}

.timeline__dates {
  font-size: var(--font-size-small);
  color: var(--color-text-tertiary);
  font-weight: 400;
  letter-spacing: 0.02em;
  display: block;
  margin-bottom: var(--space-xs);
}

.timeline__role {
  font-family: var(--font-display);
  font-size: var(--font-size-h3);
  font-weight: 400;
  color: var(--color-text-primary);
  line-height: var(--line-height-snug);
}

.timeline__company {
  font-size: var(--font-size-body);
  color: var(--color-accent);
  margin-bottom: var(--space-xs);
}

.timeline__desc {
  font-size: var(--font-size-small);
  color: var(--color-text-secondary);
  line-height: var(--line-height-relaxed);
  max-width: 540px;
}

.timeline__entry--foundation .timeline__marker {
  border-color: var(--color-text-tertiary);
}

.timeline__entry--foundation .timeline__company {
  color: var(--color-text-secondary);
}

@media (max-width: 640px) {
  .timeline {
    padding-left: var(--space-md);
  }

  .timeline__marker {
    left: calc(-1 * var(--space-md) + 3px);
  }
}


/* ===========================
   Strengths
   =========================== */

.strengths__grid {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: var(--space-lg);
}

.strength__title {
  font-family: var(--font-display);
  font-size: var(--font-size-h3);
  font-weight: 400;
  color: var(--color-text-primary);
  margin-bottom: var(--space-xs);
  line-height: var(--line-height-snug);
}

.strength__desc {
  font-size: var(--font-size-small);
  color: var(--color-text-secondary);
  line-height: var(--line-height-relaxed);
}

@media (max-width: 640px) {
  .strengths__grid {
    grid-template-columns: 1fr;
    gap: var(--space-md);
  }
}


/* ===========================
   Education
   =========================== */

.education__list {
  display: flex;
  flex-direction: column;
  gap: var(--space-md);
}

.education__degree {
  font-family: var(--font-display);
  font-size: var(--font-size-h3);
  font-weight: 400;
  color: var(--color-text-primary);
  line-height: var(--line-height-snug);
}

.education__school {
  font-size: var(--font-size-small);
  color: var(--color-text-secondary);
  margin-top: 0.25rem;
}

.education__year {
  color: var(--color-text-tertiary);
  margin-left: 0.5rem;
}


/* ===========================
   Contact
   =========================== */

.contact__links {
  display: flex;
  flex-direction: column;
  gap: var(--space-md);
}

.contact__link {
  display: block;
  padding: var(--space-sm) 0;
  border-bottom: 1px solid var(--color-divider);
  transition: border-color var(--transition-base);
}

.contact__link:hover {
  border-color: var(--color-accent-muted);
}

.contact__link-label {
  display: block;
  font-size: var(--font-size-label);
  font-weight: 500;
  text-transform: uppercase;
  letter-spacing: 0.15em;
  color: var(--color-text-tertiary);
  margin-bottom: 0.25rem;
}

.contact__link-value {
  font-family: var(--font-display);
  font-size: var(--font-size-h2);
  color: var(--color-text-primary);
  transition: color var(--transition-base);
}

.contact__link:hover .contact__link-value {
  color: var(--color-accent);
}

@media (max-width: 640px) {
  .contact__link-value {
    font-size: var(--font-size-h3);
  }
}


/* ===========================
   Footer
   =========================== */

.footer {
  padding: var(--space-md) 0;
  border-top: 1px solid var(--color-divider);
}

.footer__inner {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: var(--space-md);
}

.footer__copy {
  font-size: var(--font-size-small);
  color: var(--color-text-tertiary);
  text-align: center;
}

@media (max-width: 640px) {
  .footer__inner {
    flex-direction: column;
    gap: var(--space-xs);
  }
}


/* ===========================
   Language Switcher
   =========================== */

.lang-switch {
  display: flex;
  align-items: center;
  gap: 0.35em;
  font-family: var(--font-body);
  font-size: var(--font-size-label);
  font-weight: 400;
  letter-spacing: 0.05em;
  text-transform: uppercase;
  user-select: none;
}

.lang-switch__current {
  color: var(--color-text-primary);
  font-weight: 500;
}

.lang-switch__sep {
  color: var(--color-text-tertiary);
}

.lang-switch__link {
  color: var(--color-text-tertiary);
  transition: color var(--transition-fast);
}

.lang-switch__link:hover {
  color: var(--color-accent);
}

/* Nav placement */
.nav__inner .lang-switch {
  margin-left: var(--space-md);
}

/* Mobile overlay variant */
.lang-switch--overlay {
  justify-content: center;
  margin-top: var(--space-lg);
  font-size: var(--font-size-small);
}

/* Footer variant */
.lang-switch--footer {
  font-size: var(--font-size-small);
}

@media (max-width: 640px) {
  .nav__inner .lang-switch {
    display: none;
  }
}