@import url('https://fonts.googleapis.com/css2?family=Inter:wght@300;400;500;600;700&family=Sarabun:wght@300;400;500;600&display=swap');

:root {
  --bg-main: #020617;
  --bg-card: rgba(15, 23, 42, 0.6);
  --bg-card-hover: rgba(30, 41, 59, 0.7);
  --border-color: rgba(255, 255, 255, 0.08);
  --border-accent: rgba(45, 212, 191, 0.25);
  --border-accent-hover: rgba(45, 212, 191, 0.5);
  
  --text-primary: #f8fafc;
  --text-secondary: #94a3b8;
  --text-muted: #64748b;
  --accent-teal: #2dd4bf;
  --accent-teal-bright: #5eead4;
  --accent-teal-dark: #0d9488;
  --accent-bg: rgba(45, 212, 191, 0.1);
  --line-green: #06C755;
  --line-green-hover: #05b34c;

  --font-family: 'Inter', 'Sarabun', system-ui, -apple-system, sans-serif;
  --max-width: 920px;
}

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

html {
  scroll-behavior: smooth;
  color-scheme: dark;
}

body {
  background-color: var(--bg-main);
  color: var(--text-secondary);
  font-family: var(--font-family);
  font-size: 0.95rem;
  line-height: 1.6;
  -webkit-font-smoothing: antialiased;
}

/* Header & Navigation */
.navbar {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  z-index: 50;
  border-bottom: 1px solid var(--border-color);
  background-color: rgba(2, 6, 23, 0.85);
  backdrop-filter: blur(12px);
  -webkit-backdrop-filter: blur(12px);
}

.nav-container {
  max-width: var(--max-width);
  margin: 0 auto;
  padding: 0.75rem 1.5rem;
  display: flex;
  align-items: center;
  justify-content: space-between;
}

.nav-logo {
  font-size: 1.1rem;
  font-weight: 700;
  color: var(--accent-teal);
  text-decoration: none;
  display: flex;
  align-items: center;
  gap: 0.35rem;
  transition: transform 0.15s ease;
}

.nav-logo:hover {
  transform: scale(1.05);
}

.pulse-line {
  display: inline-block;
  width: 24px;
  height: 14px;
  stroke: var(--accent-teal);
}

.nav-links {
  display: flex;
  gap: 1.25rem;
  overflow-x: auto;
  scrollbar-width: none;
}

.nav-links::-webkit-scrollbar {
  display: none;
}

.nav-link {
  font-size: 0.825rem;
  font-weight: 500;
  color: var(--text-secondary);
  text-decoration: none;
  white-space: nowrap;
  transition: color 0.15s ease, transform 0.15s ease;
}

.nav-link:hover, .nav-link.active {
  color: var(--accent-teal);
}

/* Main Container */
.main-content {
  max-width: var(--max-width);
  margin: 0 auto;
  padding: 6rem 1.5rem 6rem;
}

/* Sections */
.section {
  margin-bottom: 4.5rem;
  scroll-margin-top: 5rem;
}

.section-title {
  font-size: 1.25rem;
  font-weight: 600;
  color: var(--accent-teal);
  margin-bottom: 1.5rem;
  display: flex;
  align-items: center;
  gap: 0.5rem;
}

/* Crisp Sharp Hero Banner */
.hero-banner {
  position: relative;
  width: 100%;
  min-height: 520px;
  border-radius: 1.25rem;
  overflow: hidden;
  background-color: #030712;
  border: 1px solid var(--border-color);
  margin-bottom: 4rem;
  display: flex;
  align-items: center;
  justify-content: flex-end; /* Text sitting nicely on the right */
}

.hero-img-container {
  position: absolute;
  top: 0;
  left: 0; /* Photo on left side */
  width: 100%;
  height: 100%;
  pointer-events: none;
  z-index: 1;
}

@media (min-width: 768px) {
  .hero-img-container {
    width: 58%;
  }
}

.hero-bg-photo {
  width: 100%;
  height: 100%;
  object-fit: cover;
  object-position: center 10%;
  opacity: 1; /* 100% Crisp Native Quality */
  image-rendering: -webkit-optimize-contrast;
  image-rendering: crisp-edges;
}

.hero-gradient-overlay {
  position: absolute;
  inset: 0;
  z-index: 2;
  background: linear-gradient(180deg, rgba(2, 6, 23, 0.95) 0%, rgba(2, 6, 23, 0.75) 100%);
}

@media (min-width: 768px) {
  .hero-gradient-overlay {
    background: linear-gradient(270deg, 
      #020617 0%, 
      #020617 40%, 
      rgba(2, 6, 23, 0.7) 58%, 
      rgba(2, 6, 23, 0.1) 75%, 
      rgba(2, 6, 23, 0.25) 100%),
      linear-gradient(180deg, 
      transparent 0%, 
      transparent 75%, 
      #020617 100%);
  }
}

.hero-content {
  position: relative;
  z-index: 3;
  padding: 3rem 2rem;
  max-width: 560px;
}

@media (min-width: 768px) {
  .hero-content {
    padding: 3.5rem 3rem;
  }
}

.hero-title {
  font-size: 2.25rem;
  font-weight: 700;
  color: var(--text-primary);
  margin-bottom: 0.35rem;
  line-height: 1.2;
  letter-spacing: -0.02em;
}

@media (min-width: 640px) {
  .hero-title {
    font-size: 2.75rem;
  }
}

.hero-subtitle-en {
  font-size: 1.05rem;
  font-weight: 600;
  color: var(--accent-teal);
  margin-bottom: 0.25rem;
}

.hero-subtitle-th {
  font-size: 0.875rem;
  font-weight: 400;
  color: #94a3b8;
  margin-bottom: 1.25rem;
  line-height: 1.5;
}

.hero-bio {
  color: #cbd5e1;
  font-size: 0.925rem;
  margin-bottom: 1.75rem;
  line-height: 1.65;
}

.hero-social-row {
  display: flex;
  flex-wrap: wrap;
  gap: 0.75rem;
}

.icon-btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 0.5rem;
  padding: 0.6rem 1.1rem;
  border-radius: 0.5rem;
  background-color: rgba(255, 255, 255, 0.05);
  border: 1px solid var(--border-accent);
  color: var(--accent-teal);
  font-size: 0.85rem;
  font-weight: 500;
  text-decoration: none;
  cursor: pointer;
  transition: transform 0.15s ease, background-color 0.15s ease, border-color 0.15s ease, color 0.15s ease;
}

.icon-btn:hover {
  transform: translateY(-2px);
  background-color: rgba(45, 212, 191, 0.15);
  border-color: var(--accent-teal);
  color: var(--accent-teal-bright);
}

.btn-line {
  background-color: rgba(6, 199, 85, 0.12);
  border-color: rgba(6, 199, 85, 0.35);
  color: var(--line-green);
}

.btn-line:hover {
  background-color: var(--line-green);
  border-color: var(--line-green);
  color: #ffffff;
  box-shadow: 0 4px 14px 0 rgba(6, 199, 85, 0.3);
}

/* About Me - Grid Layout */
.about-grid {
  display: grid;
  gap: 1.25rem;
  grid-template-columns: 1fr;
}

@media (min-width: 768px) {
  .about-grid {
    grid-template-columns: repeat(2, 1fr);
  }
}

.about-card {
  border-radius: 0.75rem;
  border: 1px solid var(--border-color);
  background-color: var(--bg-card);
  padding: 1.25rem 1.25rem;
  display: flex;
  align-items: flex-start;
  gap: 0.75rem;
  transition: border-color 0.15s ease, transform 0.15s ease;
}

.about-card:hover {
  border-color: var(--border-accent-hover);
  transform: translateY(-2px);
}

.about-dot-icon {
  width: 1.25rem;
  height: 1.25rem;
  border-radius: 9999px;
  background-color: rgba(45, 212, 191, 0.15);
  color: var(--accent-teal);
  display: flex;
  align-items: center;
  justify-content: center;
  flex-shrink: 0;
  margin-top: 0.2rem;
}

.about-card p {
  font-size: 0.875rem;
  line-height: 1.6;
  color: #cbd5e1;
}

/* Timeline Layout */
.timeline {
  display: flex;
  flex-direction: column;
  gap: 1.5rem;
}

.timeline-card {
  border-radius: 0.875rem;
  border: 1px solid var(--border-color);
  background-color: var(--bg-card);
  padding: 1.5rem;
  display: flex;
  gap: 1.25rem;
  transition: transform 0.15s ease, border-color 0.15s ease, box-shadow 0.15s ease;
}

.timeline-card:hover {
  transform: translateY(-2px);
  border-color: var(--border-accent-hover);
  box-shadow: 0 10px 25px -5px rgba(45, 212, 191, 0.08);
}

.timeline-badge {
  display: flex;
  width: 2.75rem;
  height: 2.75rem;
  align-items: center;
  justify-content: center;
  border-radius: 0.75rem;
  background-color: rgba(45, 212, 191, 0.1);
  color: var(--accent-teal);
  flex-shrink: 0;
}

.timeline-info {
  display: flex;
  flex-direction: column;
  gap: 0.35rem;
}

.timeline-role {
  font-size: 1rem;
  font-weight: 600;
  color: var(--text-primary);
}

.timeline-org {
  font-size: 0.875rem;
  font-weight: 500;
  color: var(--accent-teal);
}

.timeline-dates {
  font-size: 0.8rem;
  color: var(--text-muted);
  font-variant-numeric: tabular-nums;
  margin-bottom: 0.35rem;
}

.timeline-desc {
  font-size: 0.875rem;
  color: #cbd5e1;
  line-height: 1.6;
}

/* Featured Education Card */
.edu-featured-box {
  border-radius: 0.875rem;
  border: 1px solid var(--border-accent);
  background-color: rgba(45, 212, 191, 0.04);
  padding: 1.5rem;
  display: flex;
  align-items: flex-start;
  gap: 1.25rem;
  margin-bottom: 1.25rem;
  transition: border-color 0.15s ease, transform 0.15s ease;
}

.edu-featured-box:hover {
  border-color: var(--accent-teal);
  transform: translateY(-2px);
}

/* Skills & Topic Interests Grid */
.skills-grid {
  display: grid;
  gap: 1rem;
  grid-template-columns: repeat(2, 1fr);
}

@media (min-width: 640px) {
  .skills-grid {
    grid-template-columns: repeat(3, 1fr);
  }
}

.skill-card {
  border-radius: 0.75rem;
  border: 1px solid var(--border-color);
  background-color: var(--bg-card);
  padding: 1.1rem 1rem;
  display: flex;
  align-items: center;
  gap: 0.875rem;
  transition: border-color 0.15s ease, transform 0.15s ease, background-color 0.15s ease;
}

.skill-card.featured-topic {
  grid-column: 1 / -1;
  border-color: var(--border-accent);
  background-color: rgba(45, 212, 191, 0.05);
}

.skill-card:hover {
  border-color: var(--border-accent-hover);
  transform: translateY(-2px);
  background-color: var(--bg-card-hover);
}

.skill-icon {
  display: flex;
  width: 2.25rem;
  height: 2.25rem;
  align-items: center;
  justify-content: center;
  border-radius: 0.5rem;
  background-color: rgba(45, 212, 191, 0.1);
  color: var(--accent-teal);
  flex-shrink: 0;
}

.skill-title {
  font-size: 0.85rem;
  font-weight: 500;
  color: var(--text-primary);
  line-height: 1.4;
}

/* Publications Card */
.pub-card-featured {
  border-radius: 0.875rem;
  border: 1px solid var(--border-accent);
  background-color: var(--bg-card);
  padding: 1.75rem 1.5rem;
  display: flex;
  flex-direction: column;
  gap: 0.875rem;
  transition: transform 0.15s ease, border-color 0.15s ease, box-shadow 0.15s ease;
}

.pub-card-featured:hover {
  transform: translateY(-2px);
  border-color: var(--accent-teal);
  box-shadow: 0 10px 25px -5px rgba(45, 212, 191, 0.12);
}

.pub-header {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 0.625rem;
}

.pub-badge {
  display: inline-block;
  font-size: 0.725rem;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.05em;
  padding: 0.2rem 0.6rem;
  border-radius: 0.35rem;
  background-color: var(--accent-teal);
  color: #020617;
}

.pub-date {
  font-size: 0.8rem;
  color: var(--text-muted);
}

.pub-title {
  font-size: 1.05rem;
  font-weight: 600;
  line-height: 1.45;
}

.pub-title a {
  color: var(--text-primary);
  text-decoration: none;
  transition: color 0.15s ease;
}

.pub-title a:hover {
  color: var(--accent-teal-bright);
}

.pub-authors {
  font-size: 0.85rem;
  color: var(--text-secondary);
}

.pub-authors strong {
  color: var(--accent-teal);
}

.pub-abstract {
  font-size: 0.875rem;
  line-height: 1.6;
  color: #cbd5e1;
  background-color: rgba(255, 255, 255, 0.02);
  padding: 1rem;
  border-radius: 0.5rem;
  border-left: 3px solid var(--accent-teal);
}

.pub-actions {
  display: flex;
  flex-wrap: wrap;
  gap: 0.75rem;
  margin-top: 0.35rem;
}

/* Lectures & Certifications List */
.list-container {
  display: flex;
  flex-direction: column;
  gap: 0.75rem;
}

.list-item {
  display: flex;
  align-items: flex-start;
  gap: 0.875rem;
  padding: 0.75rem 1rem;
  border-radius: 0.5rem;
  border: 1px solid var(--border-color);
  background-color: var(--bg-card);
  transition: transform 0.15s ease, border-color 0.15s ease;
}

.list-item:hover {
  transform: translateX(4px);
  border-color: var(--border-accent-hover);
}

.list-icon {
  margin-top: 0.1rem;
  display: flex;
  width: 1.5rem;
  height: 1.5rem;
  flex-shrink: 0;
  align-items: center;
  justify-content: center;
  border-radius: 9999px;
  background-color: rgba(45, 212, 191, 0.1);
  color: var(--accent-teal);
}

.list-item-title {
  font-size: 0.875rem;
  font-weight: 500;
  color: var(--text-primary);
}

.list-item-year {
  font-size: 0.78rem;
  color: var(--text-muted);
  font-variant-numeric: tabular-nums;
}

/* Contact Form */
.contact-details {
  margin-bottom: 2rem;
  display: flex;
  flex-direction: column;
  gap: 0.875rem;
}

.contact-row {
  display: flex;
  align-items: center;
  gap: 0.625rem;
  color: var(--text-secondary);
  font-size: 0.875rem;
  text-decoration: none;
}

.contact-label {
  color: var(--text-muted);
  font-weight: 500;
  min-width: 4.5rem;
}

.contact-val {
  color: var(--text-primary);
}

.contact-buttons-row {
  margin-bottom: 2rem;
  display: flex;
  flex-wrap: wrap;
  gap: 0.75rem;
}

.contact-form {
  display: flex;
  flex-direction: column;
  gap: 1rem;
}

.form-grid {
  display: grid;
  gap: 1rem;
  grid-template-columns: 1fr;
}

@media (min-width: 640px) {
  .form-grid {
    grid-template-columns: 1fr 1fr;
  }
}

.form-group {
  display: flex;
  flex-direction: column;
  gap: 0.35rem;
}

.form-label {
  font-size: 0.78rem;
  font-weight: 500;
  color: var(--text-muted);
}

.form-input, .form-textarea {
  width: 100%;
  border-radius: 0.5rem;
  border: 1px solid var(--border-color);
  background-color: rgba(255, 255, 255, 0.03);
  padding: 0.65rem 1rem;
  font-size: 0.875rem;
  font-family: inherit;
  color: var(--text-primary);
  outline: none;
  transition: border-color 0.15s ease, box-shadow 0.15s ease;
}

.form-input:focus, .form-textarea:focus {
  border-color: rgba(45, 212, 191, 0.5);
  box-shadow: 0 0 0 3px rgba(45, 212, 191, 0.1);
}

.form-textarea {
  resize: vertical;
  min-height: 110px;
}

.btn-primary {
  display: inline-flex;
  align-items: center;
  gap: 0.5rem;
  border-radius: 0.5rem;
  background-color: var(--accent-teal);
  color: #020617;
  padding: 0.75rem 1.5rem;
  font-size: 0.875rem;
  font-weight: 600;
  text-decoration: none;
  border: none;
  cursor: pointer;
  box-shadow: 0 4px 14px 0 rgba(45, 212, 191, 0.25);
  transition: transform 0.15s ease, background-color 0.15s ease;
}

.btn-primary:hover {
  transform: scale(1.03);
  background-color: var(--accent-teal-bright);
}

.btn-secondary {
  display: inline-flex;
  align-items: center;
  gap: 0.5rem;
  border-radius: 0.5rem;
  background-color: rgba(255, 255, 255, 0.04);
  color: var(--text-primary);
  border: 1px solid var(--border-color);
  padding: 0.6rem 1.25rem;
  font-size: 0.85rem;
  font-weight: 500;
  text-decoration: none;
  cursor: pointer;
  transition: transform 0.15s ease, border-color 0.15s ease, color 0.15s ease, background-color 0.15s ease;
}

.btn-secondary:hover {
  transform: scale(1.03);
  border-color: var(--border-accent-hover);
  color: var(--accent-teal);
  background-color: rgba(45, 212, 191, 0.05);
}

/* Footer */
.footer {
  text-align: center;
  padding: 3rem 1.5rem;
  border-top: 1px solid var(--border-color);
  color: var(--text-muted);
  font-size: 0.8rem;
}

/* Toast */
.toast {
  position: fixed;
  bottom: 2rem;
  right: 2rem;
  z-index: 100;
  background-color: #0f172a;
  border: 1px solid var(--accent-teal);
  color: var(--text-primary);
  padding: 0.875rem 1.25rem;
  border-radius: 0.5rem;
  box-shadow: 0 10px 30px rgba(0, 0, 0, 0.5);
  display: flex;
  align-items: center;
  gap: 0.625rem;
  transform: translateY(150%);
  opacity: 0;
  transition: transform 0.3s cubic-bezier(0.16, 1, 0.3, 1), opacity 0.3s ease;
}

.toast.show {
  transform: translateY(0);
  opacity: 1;
}

/* Modal Dialog for LINE QR Code */
.modal-overlay {
  position: fixed;
  inset: 0;
  z-index: 100;
  background-color: rgba(2, 6, 23, 0.85);
  backdrop-filter: blur(8px);
  -webkit-backdrop-filter: blur(8px);
  display: flex;
  align-items: center;
  justify-content: center;
  padding: 1.5rem;
  opacity: 0;
  pointer-events: none;
  transition: opacity 0.25s ease;
}

.modal-overlay.active {
  opacity: 1;
  pointer-events: auto;
}

.modal-box {
  position: relative;
  width: 100%;
  max-width: 380px;
  background-color: #0f172a;
  border: 1px solid rgba(6, 199, 85, 0.4);
  border-radius: 1.25rem;
  padding: 2rem 1.5rem;
  text-align: center;
  box-shadow: 0 20px 40px rgba(0, 0, 0, 0.6), 0 0 30px rgba(6, 199, 85, 0.15);
  transform: scale(0.92);
  transition: transform 0.25s cubic-bezier(0.16, 1, 0.3, 1);
}

.modal-overlay.active .modal-box {
  transform: scale(1);
}

.modal-close-btn {
  position: absolute;
  top: 1rem;
  right: 1rem;
  width: 2rem;
  height: 2rem;
  border-radius: 9999px;
  background-color: rgba(255, 255, 255, 0.06);
  border: none;
  color: var(--text-secondary);
  display: flex;
  align-items: center;
  justify-content: center;
  cursor: pointer;
  transition: background-color 0.15s ease, color 0.15s ease;
}

.modal-close-btn:hover {
  background-color: rgba(255, 255, 255, 0.15);
  color: #ffffff;
}

.modal-header {
  margin-bottom: 1.25rem;
}

.modal-title {
  font-size: 1.15rem;
  font-weight: 700;
  color: #ffffff;
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 0.5rem;
}

.modal-subtitle {
  font-size: 0.8rem;
  color: var(--text-muted);
  margin-top: 0.25rem;
}

.qr-wrapper {
  width: 230px;
  height: 230px;
  margin: 0 auto 1.5rem;
  padding: 0.75rem;
  background-color: #ffffff;
  border-radius: 1rem;
  box-shadow: 0 8px 20px rgba(0, 0, 0, 0.25);
}

.qr-img {
  width: 100%;
  height: 100%;
  object-fit: contain;
}

.btn-add-line {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 0.5rem;
  width: 100%;
  padding: 0.85rem 1.25rem;
  border-radius: 0.75rem;
  background-color: var(--line-green);
  color: #ffffff;
  font-size: 0.95rem;
  font-weight: 600;
  text-decoration: none;
  box-shadow: 0 4px 14px rgba(6, 199, 85, 0.35);
  transition: transform 0.15s ease, background-color 0.15s ease, box-shadow 0.15s ease;
}

.btn-add-line:hover {
  transform: translateY(-2px);
  background-color: var(--line-green-hover);
  box-shadow: 0 6px 20px rgba(6, 199, 85, 0.45);
}