:root {
  --color-primary: #1a365d;
  --color-primary-light: #2c5282;
  --color-accent: #3182ce;
  --color-accent-light: #63b3ed;
  --color-dark: #1a202c;
  --color-brown: #3d2914;
  --color-text: #2d3748;
  --color-text-light: #718096;
  --color-bg: #ffffff;
  --color-bg-alt: #f7fafc;
  --color-bg-dark: #edf2f7;
  --color-border: #e2e8f0;
  --font-thai: 'Sarabun', sans-serif;
  --font-en: 'Inter', sans-serif;
  --shadow-sm: 0 1px 3px rgba(0, 0, 0, 0.08);
  --shadow-md: 0 4px 16px rgba(0, 0, 0, 0.1);
  --shadow-lg: 0 10px 40px rgba(0, 0, 0, 0.12);
  --radius: 12px;
  --radius-lg: 20px;
  --transition: 0.3s cubic-bezier(0.4, 0, 0.2, 1);
}

*,
*::before,
*::after {
  margin: 0;
  padding: 0;
  box-sizing: border-box;
}

html {
  scroll-behavior: smooth;
  scroll-padding-top: 80px;
}

body {
  font-family: var(--font-thai);
  font-size: 16px;
  line-height: 1.7;
  color: var(--color-text);
  background: var(--color-bg);
  overflow-x: hidden;
}

.container {
  max-width: 1140px;
  margin: 0 auto;
  padding: 0 24px;
}

/* ── Navbar ── */
.navbar {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  z-index: 1000;
  background: rgba(255, 255, 255, 0.92);
  backdrop-filter: blur(12px);
  border-bottom: 1px solid transparent;
  transition: var(--transition);
}

.navbar.scrolled {
  border-bottom-color: var(--color-border);
  box-shadow: var(--shadow-sm);
}

.nav-container {
  max-width: 1140px;
  margin: 0 auto;
  padding: 0 24px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: 72px;
}

.nav-logo {
  font-size: 1.25rem;
  font-weight: 700;
  color: var(--color-primary);
  text-decoration: none;
}

.nav-menu {
  display: flex;
  list-style: none;
  gap: 8px;
}

.nav-link {
  display: block;
  padding: 8px 16px;
  color: var(--color-text);
  text-decoration: none;
  font-weight: 500;
  font-size: 0.95rem;
  border-radius: 8px;
  transition: var(--transition);
}

.nav-link:hover,
.nav-link.active {
  color: var(--color-accent);
  background: rgba(49, 130, 206, 0.08);
}

.nav-toggle {
  display: none;
  flex-direction: column;
  gap: 5px;
  background: none;
  border: none;
  cursor: pointer;
  padding: 4px;
}

.nav-toggle span {
  display: block;
  width: 24px;
  height: 2px;
  background: var(--color-dark);
  border-radius: 2px;
  transition: var(--transition);
}

/* ── Hero ── */
.hero {
  position: relative;
  min-height: 100vh;
  display: flex;
  align-items: center;
  padding-top: 72px;
  overflow: hidden;
}

.hero-bg {
  position: absolute;
  inset: 0;
  background: linear-gradient(135deg, #ebf4ff 0%, #f7fafc 40%, #edf2f7 100%);
  z-index: -1;
}

.hero-bg::after {
  content: '';
  position: absolute;
  top: -20%;
  right: -10%;
  width: 600px;
  height: 600px;
  border-radius: 50%;
  background: radial-gradient(circle, rgba(49, 130, 206, 0.08) 0%, transparent 70%);
}

.hero-content {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 60px;
  align-items: center;
  padding: 60px 24px;
}

.hero-greeting {
  font-size: 1.1rem;
  color: var(--color-accent);
  font-weight: 500;
  margin-bottom: 8px;
}

.hero-name {
  font-size: clamp(2rem, 5vw, 3rem);
  font-weight: 700;
  color: var(--color-primary);
  line-height: 1.2;
  margin-bottom: 12px;
}

.hero-title {
  font-size: 1.15rem;
  color: var(--color-text);
  font-weight: 500;
  margin-bottom: 4px;
}

.hero-org {
  font-size: 0.95rem;
  color: var(--color-text-light);
  margin-bottom: 24px;
}

.hero-tags {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  margin-bottom: 32px;
}

.tag {
  display: inline-block;
  padding: 6px 16px;
  background: rgba(49, 130, 206, 0.1);
  color: var(--color-accent);
  border-radius: 20px;
  font-size: 0.85rem;
  font-weight: 500;
}

.hero-actions {
  display: flex;
  gap: 16px;
}

.btn {
  display: inline-flex;
  align-items: center;
  padding: 12px 28px;
  border-radius: 10px;
  font-family: var(--font-thai);
  font-size: 1rem;
  font-weight: 600;
  text-decoration: none;
  transition: var(--transition);
  cursor: pointer;
  border: 2px solid transparent;
}

.btn-primary {
  background: var(--color-primary);
  color: #fff;
}

.btn-primary:hover {
  background: var(--color-primary-light);
  transform: translateY(-2px);
  box-shadow: var(--shadow-md);
}

.btn-outline {
  background: transparent;
  color: var(--color-primary);
  border-color: var(--color-primary);
}

.btn-outline:hover {
  background: var(--color-primary);
  color: #fff;
  transform: translateY(-2px);
}

.hero-image {
  display: flex;
  justify-content: center;
}

.image-frame {
  position: relative;
  border-radius: var(--radius-lg);
  overflow: hidden;
  box-shadow: var(--shadow-lg);
}

.image-frame::before {
  content: '';
  position: absolute;
  inset: 0;
  border: 3px solid rgba(49, 130, 206, 0.2);
  border-radius: var(--radius-lg);
  z-index: 1;
  pointer-events: none;
}

.image-frame img {
  display: block;
  width: 100%;
  max-width: 420px;
  height: auto;
  object-fit: cover;
}

.scroll-indicator {
  position: absolute;
  bottom: 32px;
  left: 50%;
  transform: translateX(-50%);
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 8px;
  color: var(--color-text-light);
  font-size: 0.85rem;
  animation: bounce 2s infinite;
}

.scroll-arrow {
  width: 20px;
  height: 20px;
  border-right: 2px solid var(--color-text-light);
  border-bottom: 2px solid var(--color-text-light);
  transform: rotate(45deg);
}

@keyframes bounce {
  0%, 100% { transform: translateX(-50%) translateY(0); }
  50% { transform: translateX(-50%) translateY(8px); }
}

/* ── Sections ── */
.section {
  padding: 100px 0;
}

.section:nth-child(even) {
  background: var(--color-bg-alt);
}

.section-header {
  text-align: center;
  margin-bottom: 60px;
}

.section-label {
  display: inline-block;
  padding: 6px 20px;
  background: rgba(49, 130, 206, 0.1);
  color: var(--color-accent);
  border-radius: 20px;
  font-size: 0.9rem;
  font-weight: 600;
  margin-bottom: 16px;
}

.section-title {
  font-size: clamp(1.6rem, 3vw, 2.2rem);
  font-weight: 700;
  color: var(--color-primary);
  line-height: 1.3;
}

/* ── About ── */
.about-grid {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 24px;
  margin-bottom: 48px;
}

.about-card {
  background: var(--color-bg);
  padding: 32px 24px;
  border-radius: var(--radius);
  box-shadow: var(--shadow-sm);
  border: 1px solid var(--color-border);
  transition: var(--transition);
  text-align: center;
}

.about-card:hover {
  transform: translateY(-4px);
  box-shadow: var(--shadow-md);
}

.about-icon {
  font-size: 2rem;
  margin-bottom: 16px;
}

.about-card h3 {
  font-size: 1.05rem;
  color: var(--color-primary);
  margin-bottom: 8px;
}

.about-card p {
  font-size: 0.9rem;
  color: var(--color-text-light);
  line-height: 1.6;
}

.about-info {
  display: flex;
  justify-content: center;
  gap: 48px;
  flex-wrap: wrap;
  padding: 32px;
  background: var(--color-bg);
  border-radius: var(--radius);
  border: 1px solid var(--color-border);
}

.info-item {
  text-align: center;
}

.info-label {
  display: block;
  font-size: 0.85rem;
  color: var(--color-text-light);
  margin-bottom: 4px;
}

.info-value {
  font-weight: 600;
  color: var(--color-primary);
}

/* ── Education Timeline ── */
.timeline {
  position: relative;
  max-width: 700px;
  margin: 0 auto 48px;
  padding-left: 40px;
}

.timeline::before {
  content: '';
  position: absolute;
  left: 12px;
  top: 0;
  bottom: 0;
  width: 2px;
  background: var(--color-accent-light);
}

.timeline-item {
  position: relative;
  margin-bottom: 40px;
}

.timeline-marker {
  position: absolute;
  left: -34px;
  top: 4px;
  width: 14px;
  height: 14px;
  border-radius: 50%;
  background: var(--color-accent);
  border: 3px solid var(--color-bg);
  box-shadow: 0 0 0 3px var(--color-accent-light);
}

.timeline-degree {
  display: inline-block;
  padding: 4px 12px;
  background: var(--color-primary);
  color: #fff;
  border-radius: 6px;
  font-size: 0.8rem;
  font-weight: 600;
  margin-bottom: 8px;
}

.timeline-content h3 {
  font-size: 1.15rem;
  color: var(--color-primary);
  margin-bottom: 4px;
}

.timeline-content p {
  color: var(--color-text-light);
  margin-bottom: 4px;
}

.timeline-org {
  font-weight: 600;
  color: var(--color-accent);
  font-size: 0.95rem;
}

.honors-box {
  max-width: 700px;
  margin: 0 auto;
  padding: 32px;
  background: var(--color-bg);
  border-radius: var(--radius);
  border-left: 4px solid var(--color-accent);
  box-shadow: var(--shadow-sm);
}

.honors-box h3 {
  color: var(--color-primary);
  margin-bottom: 16px;
  font-size: 1.1rem;
}

.honors-list {
  list-style: none;
}

.honors-list li {
  position: relative;
  padding-left: 20px;
  margin-bottom: 12px;
  font-size: 0.95rem;
  color: var(--color-text);
  line-height: 1.6;
}

.honors-list li::before {
  content: '★';
  position: absolute;
  left: 0;
  color: var(--color-accent);
  font-size: 0.75rem;
  top: 4px;
}

/* ── Awards ── */
.awards-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 24px;
}

.award-card {
  background: var(--color-bg);
  padding: 28px;
  border-radius: var(--radius);
  border: 1px solid var(--color-border);
  transition: var(--transition);
}

.award-card:hover {
  transform: translateY(-4px);
  box-shadow: var(--shadow-md);
}

.award-card.featured {
  grid-column: span 3;
  background: linear-gradient(135deg, var(--color-primary) 0%, var(--color-primary-light) 100%);
  color: #fff;
  border: none;
}

.award-card.featured h3,
.award-card.featured p {
  color: #fff;
}

.award-card.featured .award-year {
  background: rgba(255, 255, 255, 0.2);
  color: #fff;
}

.award-year {
  display: inline-block;
  padding: 4px 12px;
  background: rgba(49, 130, 206, 0.1);
  color: var(--color-accent);
  border-radius: 6px;
  font-size: 0.85rem;
  font-weight: 700;
  margin-bottom: 12px;
  font-family: var(--font-en);
}

.award-card h3 {
  font-size: 1.05rem;
  color: var(--color-primary);
  margin-bottom: 8px;
}

.award-card p {
  font-size: 0.9rem;
  color: var(--color-text-light);
  line-height: 1.6;
}

/* ── Career ── */
.career-timeline {
  max-width: 800px;
  margin: 0 auto;
}

.career-item {
  display: grid;
  grid-template-columns: 160px 1fr;
  gap: 24px;
  padding: 24px 0;
  border-bottom: 1px solid var(--color-border);
  transition: var(--transition);
}

.career-item:last-child {
  border-bottom: none;
}

.career-item:hover {
  padding-left: 8px;
}

.career-period {
  font-family: var(--font-en);
  font-weight: 700;
  font-size: 0.9rem;
  color: var(--color-accent);
  padding-top: 2px;
}

.career-details h3 {
  font-size: 1.05rem;
  color: var(--color-primary);
  margin-bottom: 4px;
}

.career-details p {
  font-size: 0.9rem;
  color: var(--color-text-light);
}

/* ── Media ── */
.media-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 20px;
}

.media-card {
  background: var(--color-bg);
  padding: 24px;
  border-radius: var(--radius);
  border: 1px solid var(--color-border);
  transition: var(--transition);
}

.media-card:hover {
  transform: translateY(-3px);
  box-shadow: var(--shadow-md);
  border-color: var(--color-accent-light);
}

.media-channel {
  display: inline-block;
  padding: 3px 10px;
  background: var(--color-bg-dark);
  color: var(--color-text-light);
  border-radius: 4px;
  font-size: 0.75rem;
  font-weight: 600;
  font-family: var(--font-en);
  margin-bottom: 10px;
}

.media-card h3 {
  font-size: 1rem;
  color: var(--color-primary);
  margin-bottom: 6px;
}

.media-card p {
  font-size: 0.85rem;
  color: var(--color-text-light);
  line-height: 1.5;
}

/* ── Contact ── */
.contact-content {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 48px;
  align-items: center;
}

.contact-info {
  display: flex;
  flex-direction: column;
  gap: 24px;
}

.contact-item {
  display: flex;
  gap: 16px;
  align-items: flex-start;
}

.contact-icon {
  font-size: 1.5rem;
  flex-shrink: 0;
  width: 48px;
  height: 48px;
  display: flex;
  align-items: center;
  justify-content: center;
  background: rgba(49, 130, 206, 0.1);
  border-radius: 10px;
}

.contact-item h4 {
  font-size: 0.85rem;
  color: var(--color-text-light);
  margin-bottom: 4px;
}

.contact-item p {
  font-size: 1rem;
  color: var(--color-text);
  line-height: 1.5;
}

.contact-cta {
  padding: 40px;
  background: var(--color-bg);
  border-radius: var(--radius-lg);
  border: 1px solid var(--color-border);
  border-left: 4px solid var(--color-accent);
  box-shadow: var(--shadow-sm);
}

.contact-cta h3 {
  font-size: 1.3rem;
  color: var(--color-primary);
  margin-bottom: 12px;
}

.contact-cta p {
  color: var(--color-text-light);
  line-height: 1.6;
}

/* ── Footer ── */
.footer {
  padding: 32px 0;
  text-align: center;
  background: var(--color-dark);
  color: rgba(255, 255, 255, 0.7);
  font-size: 0.9rem;
}

.footer-sub {
  margin-top: 4px;
  font-size: 0.8rem;
  opacity: 0.5;
}

/* ── Animations ── */
.fade-in {
  opacity: 0;
  transform: translateY(24px);
  transition: opacity 0.6s ease, transform 0.6s ease;
}

.fade-in.visible {
  opacity: 1;
  transform: translateY(0);
}

/* ── Responsive ── */
@media (max-width: 1024px) {
  .about-grid {
    grid-template-columns: repeat(2, 1fr);
  }

  .awards-grid {
    grid-template-columns: repeat(2, 1fr);
  }

  .award-card.featured {
    grid-column: span 2;
  }

  .media-grid {
    grid-template-columns: repeat(2, 1fr);
  }
}

@media (max-width: 768px) {
  .nav-toggle {
    display: flex;
  }

  .nav-menu {
    position: fixed;
    top: 72px;
    left: 0;
    right: 0;
    background: rgba(255, 255, 255, 0.98);
    backdrop-filter: blur(12px);
    flex-direction: column;
    padding: 16px 24px;
    gap: 4px;
    border-bottom: 1px solid var(--color-border);
    transform: translateY(-120%);
    opacity: 0;
    transition: var(--transition);
    pointer-events: none;
  }

  .nav-menu.open {
    transform: translateY(0);
    opacity: 1;
    pointer-events: auto;
  }

  .hero-content {
    grid-template-columns: 1fr;
    text-align: center;
    gap: 40px;
    padding: 40px 24px;
  }

  .hero-tags {
    justify-content: center;
  }

  .hero-actions {
    justify-content: center;
  }

  .hero-image {
    order: -1;
  }

  .image-frame img {
    max-width: 280px;
  }

  .scroll-indicator {
    display: none;
  }

  .about-grid {
    grid-template-columns: 1fr;
  }

  .about-info {
    flex-direction: column;
    gap: 24px;
  }

  .awards-grid {
    grid-template-columns: 1fr;
  }

  .award-card.featured {
    grid-column: span 1;
  }

  .career-item {
    grid-template-columns: 1fr;
    gap: 8px;
  }

  .media-grid {
    grid-template-columns: 1fr;
  }

  .contact-content {
    grid-template-columns: 1fr;
  }

  .section {
    padding: 72px 0;
  }
}

@media (max-width: 480px) {
  .hero-name {
    font-size: 1.8rem;
  }

  .hero-actions {
    flex-direction: column;
    align-items: center;
  }

  .btn {
    width: 100%;
    justify-content: center;
  }
}