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

:root {
  --bg: #ffffff;
  --bg-alt: #f8fafc;
  --bg-card: #ffffff;
  --bg-nav: rgba(255, 255, 255, 0.9);
  --text: #0f172a;
  --text-secondary: #334155;
  --text-muted: #64748b;
  --accent: #0d9488;
  --accent-light: #14b8a6;
  --accent-bg: rgba(13, 148, 136, 0.07);
  --accent-border: rgba(13, 148, 136, 0.2);
  --blue: #3b82f6;
  --blue-bg: rgba(59, 130, 246, 0.06);
  --purple: #7c3aed;
  --purple-bg: rgba(124, 58, 237, 0.06);
  --border: #e2e8f0;
  --border-light: #f1f5f9;
  --shadow-xs: 0 1px 2px rgba(0,0,0,0.04);
  --shadow-sm: 0 1px 3px rgba(0,0,0,0.06), 0 1px 2px rgba(0,0,0,0.04);
  --shadow-md: 0 4px 12px rgba(0,0,0,0.07);
  --shadow-lg: 0 10px 30px rgba(0,0,0,0.08);
  --radius: 16px;
  --radius-sm: 12px;
  --radius-xs: 8px;
  --transition: 0.25s ease;
}

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

body {
  font-family: 'Inter', -apple-system, BlinkMacSystemFont, sans-serif;
  background-color: var(--bg);
  color: var(--text);
  line-height: 1.6;
  -webkit-font-smoothing: antialiased;
}

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

img {
  max-width: 100%;
}

/* ===== Container ===== */
.container {
  max-width: 1080px;
  margin: 0 auto;
  padding: 0 28px;
}

/* ===== Navigation ===== */
#navbar {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  z-index: 1000;
  background: var(--bg-nav);
  backdrop-filter: blur(20px);
  -webkit-backdrop-filter: blur(20px);
  border-bottom: 1px solid var(--border-light);
}

.nav-container {
  max-width: 1080px;
  margin: 0 auto;
  padding: 0 28px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: 64px;
}

.nav-logo {
  display: flex;
  align-items: center;
  gap: 6px;
  font-weight: 700;
  font-size: 1rem;
  color: var(--text);
  letter-spacing: -0.3px;
}
.logo-icon {
  color: var(--accent);
  font-size: 0.8rem;
}

.nav-links {
  display: flex;
  gap: 32px;
  list-style: none;
}

.nav-links a {
  color: var(--text-muted);
  font-size: 0.85rem;
  font-weight: 500;
  transition: color var(--transition);
}
.nav-links a:hover {
  color: var(--text);
}

.nav-toggle {
  display: none;
  flex-direction: column;
  gap: 5px;
  background: none;
  border: none;
  cursor: pointer;
  padding: 4px;
}
.nav-toggle span {
  width: 20px;
  height: 2px;
  background: var(--text);
  border-radius: 2px;
  transition: var(--transition);
}

/* ===== Hero ===== */
#hero {
  padding: 140px 0 80px;
  background: var(--bg);
}

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

.hero-label {
  font-size: 0.8rem;
  font-weight: 500;
  color: var(--text-muted);
  margin-bottom: 16px;
  letter-spacing: 0.3px;
}

#hero h1 {
  font-size: 2.8rem;
  font-weight: 800;
  line-height: 1.15;
  letter-spacing: -1.5px;
  color: var(--text);
  margin-bottom: 20px;
}

.hero-highlight {
  background: linear-gradient(135deg, var(--accent), var(--accent-light));
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}

.hero-desc {
  font-size: 0.95rem;
  color: var(--text-muted);
  line-height: 1.7;
  max-width: 480px;
  margin-bottom: 32px;
}

.hero-desc strong {
  color: var(--text-secondary);
  font-weight: 600;
}

.hero-actions {
  display: flex;
  gap: 12px;
  align-items: center;
}

/* Buttons */
.btn {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 12px 28px;
  border-radius: var(--radius-xs);
  font-size: 0.875rem;
  font-weight: 600;
  cursor: pointer;
  transition: all var(--transition);
  background: var(--accent);
  color: #fff;
  border: none;
}
.btn:hover {
  background: var(--accent-light);
  color: #fff;
  transform: translateY(-1px);
  box-shadow: var(--shadow-md);
}

.btn-ghost {
  background: transparent;
  color: var(--text-secondary);
  border: 1.5px solid var(--border);
}
.btn-ghost:hover {
  background: var(--bg-alt);
  color: var(--text);
  border-color: var(--text-muted);
}

/* Hero photo */
.hero-photo-wrapper {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 16px;
}

.hero-photo-card {
  width: 240px;
  height: 280px;
  border-radius: 20px;
  overflow: hidden;
  box-shadow: var(--shadow-lg);
  border: 3px solid var(--bg);
  outline: 1px solid var(--border);
}

.hero-photo {
  width: 100%;
  height: 100%;
  object-fit: cover;
}

.hero-social {
  display: flex;
  gap: 8px;
}

.social-icon {
  width: 38px;
  height: 38px;
  border-radius: 10px;
  display: flex;
  align-items: center;
  justify-content: center;
  background: var(--bg-alt);
  color: var(--text-muted);
  border: 1px solid var(--border);
  transition: all var(--transition);
}
.social-icon:hover {
  background: var(--accent);
  color: #fff;
  border-color: var(--accent);
  transform: translateY(-2px);
  box-shadow: var(--shadow-sm);
}

/* ===== Section Shared ===== */
section {
  padding: 80px 0;
}

.section-label {
  display: inline-block;
  font-size: 0.75rem;
  font-weight: 600;
  color: var(--accent);
  text-transform: uppercase;
  letter-spacing: 2px;
  margin-bottom: 8px;
}

h2 {
  font-size: 2rem;
  font-weight: 800;
  letter-spacing: -0.8px;
  color: var(--text);
  margin-bottom: 40px;
}

/* ===== About ===== */
#about {
  background: var(--bg-alt);
  border-top: 1px solid var(--border-light);
  border-bottom: 1px solid var(--border-light);
}

.about-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 40px;
}

.about-info {
  display: flex;
  flex-direction: column;
  gap: 16px;
}

.about-card {
  display: flex;
  align-items: flex-start;
  gap: 16px;
  background: var(--bg-card);
  padding: 20px;
  border-radius: var(--radius-sm);
  border: 1px solid var(--border);
  transition: all var(--transition);
}
.about-card:hover {
  box-shadow: var(--shadow-sm);
  border-color: var(--accent-border);
}

.about-card-icon {
  font-size: 1.4rem;
  flex-shrink: 0;
  width: 40px;
  height: 40px;
  display: flex;
  align-items: center;
  justify-content: center;
  background: var(--accent-bg);
  border-radius: 10px;
}

.about-card h4 {
  font-size: 0.85rem;
  font-weight: 700;
  color: var(--text);
  margin-bottom: 2px;
}

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

.about-card p strong {
  color: var(--accent);
}

.about-orgs h3 {
  font-size: 1.1rem;
  font-weight: 700;
  margin-bottom: 20px;
  color: var(--text);
}

.org-list {
  display: flex;
  flex-direction: column;
  gap: 16px;
}

.org-item {
  display: flex;
  gap: 14px;
  align-items: flex-start;
}

.org-dot {
  width: 8px;
  height: 8px;
  border-radius: 50%;
  background: var(--accent);
  margin-top: 7px;
  flex-shrink: 0;
}

.org-item strong {
  display: block;
  font-size: 0.9rem;
  font-weight: 600;
  color: var(--text);
  margin-bottom: 2px;
}

.org-role {
  display: block;
  font-size: 0.8rem;
  color: var(--text-muted);
}

/* ===== Projects ===== */
#projects {
  background: var(--bg);
}

.project-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 24px;
}

.project-card {
  background: var(--bg-card);
  border-radius: var(--radius);
  border: 1px solid var(--border);
  overflow: hidden;
  transition: all var(--transition);
}
.project-card:hover {
  box-shadow: var(--shadow-md);
  transform: translateY(-3px);
  border-color: var(--accent-border);
}

.project-thumb {
  height: 160px;
  overflow: hidden;
}

.project-thumb-inner {
  width: 100%;
  height: 100%;
  display: flex;
  align-items: center;
  justify-content: center;
}

.project-thumb-1 {
  background: linear-gradient(135deg, #0f172a 0%, #1e293b 100%);
}
.project-thumb-2 {
  background: linear-gradient(135deg, #0d9488 0%, #0f766e 100%);
}
.project-thumb-3 {
  background: linear-gradient(135deg, #3b82f6 0%, #2563eb 100%);
}

.project-thumb-text {
  font-size: 1.8rem;
  color: rgba(255,255,255,0.9);
  font-weight: 700;
  letter-spacing: -0.5px;
}

.project-info {
  padding: 20px;
}

.project-info h3 {
  font-size: 0.95rem;
  font-weight: 700;
  color: var(--text);
  margin-bottom: 8px;
  line-height: 1.4;
}

.project-info p {
  font-size: 0.82rem;
  color: var(--text-muted);
  line-height: 1.6;
  margin-bottom: 14px;
}

.project-meta {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 8px;
}

.project-tag {
  font-size: 0.7rem;
  font-weight: 600;
  padding: 4px 10px;
  border-radius: 6px;
  background: var(--bg-alt);
  color: var(--text-muted);
  border: 1px solid var(--border);
}

.project-link {
  display: inline-flex;
  align-items: center;
  gap: 4px;
  font-size: 0.75rem;
  font-weight: 600;
  color: var(--accent);
  margin-left: auto;
}
.project-link:hover {
  color: var(--accent-light);
}

/* ===== Badge ===== */
.badge {
  display: inline-block;
  font-size: 0.7rem;
  font-weight: 600;
  color: var(--accent);
  background: var(--accent-bg);
  padding: 3px 10px;
  border-radius: 6px;
  margin-bottom: 6px;
}

.badge-progress {
  color: #d97706;
  background: rgba(217, 119, 6, 0.08);
}

/* ===== Certification ===== */
#certification {
  background: var(--bg-alt);
  border-top: 1px solid var(--border-light);
  border-bottom: 1px solid var(--border-light);
}

.cert-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(300px, 1fr));
  gap: 24px;
}

.cert-card {
  background: var(--bg-card);
  border-radius: var(--radius);
  border: 1px solid var(--border);
  overflow: hidden;
  transition: all var(--transition);
}
.cert-card:hover {
  box-shadow: var(--shadow-md);
  transform: translateY(-3px);
  border-color: var(--accent-border);
}

.cert-img-wrapper {
  padding: 16px 16px 0;
}

.cert-img {
  width: 100%;
  border-radius: var(--radius-xs);
  display: block;
}

.cert-info {
  padding: 18px 20px 20px;
}

.cert-info h3 {
  font-size: 0.95rem;
  font-weight: 700;
  color: var(--text);
  margin-bottom: 4px;
}

.cert-info p {
  font-size: 0.82rem;
  color: var(--text-muted);
  margin-bottom: 8px;
}

.cert-date {
  font-size: 0.75rem;
  font-weight: 600;
  color: var(--accent);
}

/* ===== Experience ===== */
#experience {
  background: var(--bg);
}

.exp-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 48px;
}

.exp-desc p {
  font-size: 0.92rem;
  color: var(--text-muted);
  margin-bottom: 28px;
  line-height: 1.7;
}

.exp-skills {
  margin-bottom: 28px;
}

.exp-skills h4,
.exp-edu h4 {
  font-size: 0.85rem;
  font-weight: 700;
  color: var(--text);
  margin-bottom: 12px;
  text-transform: uppercase;
  letter-spacing: 1px;
}

.skill-tags {
  display: flex;
  flex-wrap: wrap;
  gap: 6px;
}

.tag {
  font-size: 0.75rem;
  font-weight: 500;
  padding: 5px 12px;
  border-radius: 6px;
  background: var(--accent-bg);
  color: var(--accent);
  border: 1px solid var(--accent-border);
  transition: all var(--transition);
}

.tag:hover {
  background: var(--accent);
  color: #fff;
  border-color: var(--accent);
}

.tag-soft {
  background: var(--purple-bg);
  color: var(--purple);
  border-color: rgba(124, 58, 237, 0.15);
}
.tag-soft:hover {
  background: var(--purple);
  color: #fff;
  border-color: var(--purple);
}

.edu-item {
  margin-bottom: 12px;
}

.edu-item strong {
  display: block;
  font-size: 0.88rem;
  font-weight: 600;
  color: var(--text);
  margin-bottom: 2px;
}

.edu-item span {
  font-size: 0.8rem;
  color: var(--text-muted);
}

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

.exp-timeline::before {
  content: '';
  position: absolute;
  left: 5px;
  top: 8px;
  bottom: 8px;
  width: 2px;
  background: var(--border);
}

.exp-item {
  position: relative;
  padding-bottom: 32px;
}
.exp-item:last-child {
  padding-bottom: 0;
}

.exp-dot {
  position: absolute;
  left: -28px;
  top: 6px;
  width: 12px;
  height: 12px;
  border-radius: 50%;
  background: var(--accent);
  border: 3px solid var(--bg);
  box-shadow: 0 0 0 2px var(--accent);
  z-index: 1;
}

.exp-content {
  background: var(--bg-alt);
  padding: 20px;
  border-radius: var(--radius-sm);
  border: 1px solid var(--border);
  transition: all var(--transition);
}
.exp-content:hover {
  box-shadow: var(--shadow-sm);
  border-color: var(--accent-border);
}

.exp-period {
  display: inline-block;
  font-size: 0.72rem;
  font-weight: 600;
  color: var(--accent);
  background: var(--accent-bg);
  padding: 3px 10px;
  border-radius: 6px;
  margin-bottom: 8px;
}

.exp-content h3 {
  font-size: 0.95rem;
  font-weight: 700;
  color: var(--text);
  margin-bottom: 6px;
}

.exp-content p {
  font-size: 0.82rem;
  color: var(--text-muted);
  line-height: 1.6;
}

/* ===== Contact ===== */
#contact {
  background: var(--bg-alt);
  border-top: 1px solid var(--border-light);
}

#contact h2 {
  font-size: 2.2rem;
  margin-bottom: 16px;
}

.contact-desc {
  font-size: 0.92rem;
  color: var(--text-muted);
  max-width: 560px;
  line-height: 1.7;
  margin-bottom: 32px;
}

.contact-cards {
  display: flex;
  gap: 16px;
  flex-wrap: wrap;
}

.contact-card {
  display: flex;
  align-items: center;
  gap: 12px;
  background: var(--bg-card);
  padding: 16px 24px;
  border-radius: var(--radius-sm);
  border: 1px solid var(--border);
  color: var(--text-secondary);
  font-size: 0.88rem;
  font-weight: 500;
  transition: all var(--transition);
}

.contact-card svg {
  color: var(--accent);
  flex-shrink: 0;
}

.contact-card:hover {
  box-shadow: var(--shadow-md);
  transform: translateY(-2px);
  border-color: var(--accent-border);
  color: var(--accent);
}

/* ===== Footer ===== */
footer {
  text-align: center;
  padding: 32px 0;
  background: var(--bg);
  border-top: 1px solid var(--border-light);
}

footer p {
  font-size: 0.78rem;
  color: var(--text-muted);
}

/* ===== Animations ===== */
@keyframes fadeUp {
  from {
    opacity: 0;
    transform: translateY(24px);
  }
  to {
    opacity: 1;
    transform: translateY(0);
  }
}

.fade-in {
  opacity: 0;
  transform: translateY(20px);
  transition: opacity 0.6s ease, transform 0.6s ease;
}
.fade-in.visible {
  opacity: 1;
  transform: translateY(0);
}

/* ===== Responsive ===== */
@media (max-width: 900px) {
  .hero-grid {
    grid-template-columns: 1fr;
    text-align: center;
    gap: 40px;
  }
  .hero-text {
    order: 2;
  }
  .hero-photo-wrapper {
    order: 1;
  }
  .hero-desc {
    max-width: 100%;
  }
  .hero-actions {
    justify-content: center;
  }
  #hero h1 {
    font-size: 2rem;
  }
  .project-grid {
    grid-template-columns: 1fr 1fr;
  }
  .about-grid {
    grid-template-columns: 1fr;
  }
  .exp-grid {
    grid-template-columns: 1fr;
  }
}

@media (max-width: 640px) {
  .nav-links {
    display: none;
    position: absolute;
    top: 64px;
    left: 0;
    right: 0;
    flex-direction: column;
    background: var(--bg-nav);
    backdrop-filter: blur(20px);
    -webkit-backdrop-filter: blur(20px);
    padding: 20px 28px;
    gap: 16px;
    border-bottom: 1px solid var(--border);
  }
  .nav-links.active {
    display: flex;
  }
  .nav-toggle {
    display: flex;
  }

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

  .contact-cards {
    flex-direction: column;
  }

  #hero h1 {
    font-size: 1.7rem;
  }

  h2 {
    font-size: 1.6rem;
  }
}