/* ===== CSS RESET & VARIABLES ===== */
:root {
  /* Colors - Light Theme */
  --bg-primary: #fafaf9;
  --bg-secondary: #f4f3f0;
  --bg-card: #ffffff;
  --text-primary: #1c1917;
  --text-secondary: #57534e;
  --text-muted: #8c857f;
  --accent: #ea580c;
  --accent-hover: #c2410c;
  --accent-light: rgba(234, 88, 12, 0.1);
  --border: #e5e2dc;
  --border-light: #ece9e3;

  /* Typography */
  --font-sans: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
  --font-mono: 'JetBrains Mono', 'SF Mono', Menlo, Consolas, monospace;

  /* Spacing */
  --container-max: 1120px;
  --section-padding: 96px;
  --header-height: 72px;

  /* Transitions */
  --transition-fast: 0.18s cubic-bezier(0.4, 0, 0.2, 1);
  --transition-base: 0.25s cubic-bezier(0.4, 0, 0.2, 1);
  --transition-slow: 0.4s cubic-bezier(0.4, 0, 0.2, 1);

  color-scheme: light;
}

body.dark-theme {
  --bg-primary: #0a0908;
  --bg-secondary: #141312;
  --bg-card: #181716;
  --text-primary: #fafaf9;
  --text-secondary: #a8a29e;
  --text-muted: #78716c;
  --accent: #f97316;
  --accent-hover: #fb923c;
  --accent-light: rgba(249, 115, 22, 0.15);
  --border: #292624;
  --border-light: #1f1d1b;

  color-scheme: dark;
}

/* ===== BASE STYLES ===== */
*, *::before, *::after {
  box-sizing: border-box;
  margin: 0;
  padding: 0;
}

html {
  scroll-behavior: smooth;
  scroll-padding-top: calc(var(--header-height) + 24px);
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}

body {
  font-family: var(--font-sans);
  font-size: 16px;
  line-height: 1.6;
  color: var(--text-primary);
  background: var(--bg-primary);
  transition: background var(--transition-base), color var(--transition-base);
}

a {
  color: inherit;
  text-decoration: none;
}

img {
  max-width: 100%;
  height: auto;
  display: block;
}

/* ===== LAYOUT ===== */
.container {
  width: min(var(--container-max), calc(100% - 48px));
  margin: 0 auto;
}

section, .hero {
  scroll-margin-top: calc(var(--header-height) + 24px);
}

/* ===== HEADER ===== */
.site-header {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  height: var(--header-height);
  background: rgba(250, 250, 249, 0.88);
  backdrop-filter: blur(14px);
  -webkit-backdrop-filter: blur(14px);
  border-bottom: 1px solid var(--border-light);
  z-index: 200;
  transition: background var(--transition-base), border-color var(--transition-base);
}

body.dark-theme .site-header {
  background: rgba(10, 9, 8, 0.88);
}

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

.brand {
  display: flex;
  align-items: center;
  gap: 10px;
  font-size: 20px;
  font-weight: 700;
  letter-spacing: -0.03em;
}

.brand span {
  color: var(--accent);
}

.brand-badge {
  font-size: 11px;
  font-family: var(--font-mono);
  font-weight: 500;
  padding: 3px 8px;
  border-radius: 6px;
  background: var(--bg-secondary);
  color: var(--text-muted);
  border: 1px solid var(--border);
}

.site-nav {
  display: flex;
  align-items: center;
  gap: 6px;
}

.site-nav a {
  padding: 8px 14px;
  font-size: 14px;
  font-weight: 500;
  color: var(--text-secondary);
  border-radius: 8px;
  transition: all var(--transition-fast);
}

.site-nav a:hover {
  color: var(--text-primary);
  background: var(--bg-secondary);
}

.site-nav a.active {
  color: var(--accent);
  background: var(--accent-light);
  font-weight: 600;
}

.header-actions {
  display: flex;
  align-items: center;
  gap: 10px;
}

.theme-toggle {
  display: flex;
  align-items: center;
  justify-content: center;
  width: 40px;
  height: 40px;
  border: 1px solid var(--border);
  border-radius: 10px;
  background: var(--bg-card);
  color: var(--text-secondary);
  cursor: pointer;
  transition: all var(--transition-fast);
}

.theme-toggle .icon-dark {
  display: none;
}

body.dark-theme .theme-toggle .icon-light {
  display: none;
}

body.dark-theme .theme-toggle .icon-dark {
  display: block;
}

.theme-toggle:hover {
  border-color: var(--accent);
  color: var(--accent);
  transform: rotate(15deg);
}

.menu-toggle {
  display: none;
  align-items: center;
  justify-content: center;
  gap: 6px;
  height: 40px;
  padding: 0 14px;
  border: 1px solid var(--border);
  border-radius: 10px;
  background: var(--bg-card);
  color: var(--text-primary);
  font-size: 14px;
  font-weight: 600;
  cursor: pointer;
  transition: all var(--transition-fast);
}

.menu-toggle:hover {
  border-color: var(--accent);
  color: var(--accent);
}

/* ===== MAIN CONTENT ===== */
main {
  padding-top: var(--header-height);
}

/* ===== HERO SECTION ===== */
.hero {
  min-height: calc(100vh - var(--header-height));
  display: flex;
  align-items: center;
  padding: var(--section-padding) 0;
}

.hero .container {
  display: grid;
  grid-template-columns: minmax(0, 1.25fr) minmax(260px, 360px);
  align-items: center;
  gap: 56px;
}

.hero-content {
  max-width: 660px;
}

.hero-badge {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  padding: 8px 16px;
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: 100px;
  font-size: 13px;
  font-weight: 500;
  color: var(--text-secondary);
  margin-bottom: 24px;
  box-shadow: 0 2px 8px rgba(0, 0, 0, 0.03);
}

.status-dot {
  width: 8px;
  height: 8px;
  background: #22c55e;
  border-radius: 50%;
  box-shadow: 0 0 0 3px rgba(34, 197, 94, 0.2);
}

.hero-title {
  font-size: clamp(38px, 5.2vw, 64px);
  font-weight: 800;
  line-height: 1.1;
  letter-spacing: -0.035em;
  margin-bottom: 12px;
}

.hero-title em {
  font-style: normal;
  color: var(--accent);
}

.hero-role {
  font-size: clamp(18px, 2.3vw, 22px);
  font-weight: 600;
  color: var(--text-secondary);
  margin-bottom: 20px;
  letter-spacing: -0.01em;
}

.hero-role span {
  color: var(--accent);
}

.hero-description {
  font-size: 17px;
  color: var(--text-secondary);
  line-height: 1.7;
  margin-bottom: 34px;
}

.hero-actions {
  display: flex;
  gap: 14px;
  flex-wrap: wrap;
}

.btn {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 13px 22px;
  font-size: 14px;
  font-weight: 600;
  border-radius: 12px;
  transition: all var(--transition-fast);
  cursor: pointer;
  border: none;
}

.btn-primary {
  background: var(--text-primary);
  color: var(--bg-primary);
  box-shadow: 0 4px 14px rgba(0, 0, 0, 0.08);
}

.btn-primary:hover {
  background: var(--accent);
  color: #ffffff;
  transform: translateY(-2px);
  box-shadow: 0 6px 20px rgba(234, 88, 12, 0.25);
}

.btn-secondary {
  background: var(--accent-light);
  color: var(--accent);
  border: 1px solid rgba(234, 88, 12, 0.25);
}

.btn-secondary:hover {
  background: var(--accent);
  color: #ffffff;
  transform: translateY(-2px);
}

.btn-outline {
  background: var(--bg-card);
  color: var(--text-secondary);
  border: 1px solid var(--border);
}

.btn-outline:hover {
  border-color: var(--text-primary);
  color: var(--text-primary);
  transform: translateY(-2px);
}

/* Hero Card */
.hero-image {
  display: flex;
  justify-content: center;
}

.hero-card {
  width: min(100%, 340px);
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: 28px;
  padding: 28px 24px 22px;
  box-shadow: 0 8px 32px rgba(0, 0, 0, 0.05);
  display: flex;
  flex-direction: column;
  align-items: center;
  transition: transform var(--transition-base), box-shadow var(--transition-base);
}

.hero-card:hover {
  transform: translateY(-4px);
  box-shadow: 0 16px 40px rgba(0, 0, 0, 0.08);
}

.profile-wrapper {
  position: relative;
  width: 190px;
  height: 190px;
  border-radius: 50%;
  overflow: hidden;
  border: 4px solid var(--bg-card);
  box-shadow: 0 0 0 2px var(--border), 0 12px 28px rgba(0, 0, 0, 0.12);
  margin-bottom: 20px;
}

.profile-photo {
  width: 100%;
  height: 100%;
  object-fit: cover;
  object-position: center top;
}

.hero-card-meta {
  width: 100%;
  text-align: center;
}

.hero-card-name {
  font-size: 17px;
  font-weight: 700;
  letter-spacing: -0.01em;
  margin-bottom: 4px;
}

.hero-card-affiliation {
  font-size: 13px;
  color: var(--text-secondary);
  margin-bottom: 16px;
}

.hero-stats {
  display: flex;
  flex-wrap: wrap;
  justify-content: center;
  gap: 8px;
  margin-bottom: 16px;
}

.hero-stat-pill {
  font-size: 11px;
  font-family: var(--font-mono);
  font-weight: 500;
  padding: 4px 10px;
  background: var(--bg-secondary);
  border: 1px solid var(--border);
  border-radius: 20px;
  color: var(--text-secondary);
}

.hero-info {
  width: 100%;
  display: flex;
  justify-content: space-between;
  padding-top: 14px;
  border-top: 1px solid var(--border-light);
  font-size: 11px;
  font-weight: 500;
  color: var(--text-muted);
  text-transform: uppercase;
  letter-spacing: 0.06em;
}

/* ===== SECTION STYLES ===== */
.section {
  padding: var(--section-padding) 0;
  border-top: 1px solid var(--border-light);
}

.section-header {
  display: flex;
  align-items: flex-end;
  justify-content: space-between;
  gap: 20px;
  margin-bottom: 48px;
}

.section-label {
  font-size: 12px;
  font-weight: 700;
  color: var(--accent);
  text-transform: uppercase;
  letter-spacing: 0.12em;
  margin-bottom: 6px;
}

.section-title {
  font-size: clamp(28px, 3.8vw, 40px);
  font-weight: 700;
  letter-spacing: -0.025em;
  line-height: 1.2;
}

/* ===== EDUCATION ===== */
.education-grid {
  display: grid;
  grid-template-columns: 1.15fr 0.85fr;
  gap: 32px;
}

.education-card {
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: 18px;
  padding: 32px;
  box-shadow: 0 4px 20px rgba(0, 0, 0, 0.03);
  display: flex;
  flex-direction: column;
  justify-content: space-between;
}

.period {
  display: inline-block;
  padding: 6px 12px;
  background: var(--bg-secondary);
  border-radius: 6px;
  font-size: 13px;
  font-weight: 600;
  font-family: var(--font-mono);
  color: var(--accent);
  margin-bottom: 18px;
}

.education-card h3 {
  font-size: clamp(22px, 2.6vw, 30px);
  font-weight: 700;
  letter-spacing: -0.02em;
  margin-bottom: 8px;
}

.education-card .meta {
  font-size: 15px;
  color: var(--text-secondary);
  margin-bottom: 24px;
}

.thesis {
  padding: 20px;
  background: var(--bg-secondary);
  border-radius: 12px;
  border-left: 3px solid var(--accent);
}

.thesis-label {
  font-size: 11px;
  font-weight: 700;
  color: var(--accent);
  text-transform: uppercase;
  letter-spacing: 0.08em;
  margin-bottom: 6px;
}

.thesis p {
  font-size: 14px;
  color: var(--text-secondary);
  line-height: 1.6;
}

.competency-card {
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: 18px;
  padding: 32px;
  box-shadow: 0 4px 20px rgba(0, 0, 0, 0.03);
}

.competency-title {
  font-size: 17px;
  font-weight: 700;
  letter-spacing: -0.01em;
  margin-bottom: 8px;
  display: flex;
  align-items: center;
  gap: 8px;
}

.competency-subtitle {
  font-size: 13px;
  color: var(--text-muted);
  margin-bottom: 20px;
}

.competency-list {
  display: flex;
  flex-direction: column;
  gap: 14px;
}

.competency-item {
  display: flex;
  gap: 12px;
  align-items: flex-start;
  font-size: 14px;
  color: var(--text-secondary);
  line-height: 1.5;
}

.competency-icon {
  width: 22px;
  height: 22px;
  border-radius: 6px;
  background: var(--accent-light);
  color: var(--accent);
  display: flex;
  align-items: center;
  justify-content: center;
  flex-shrink: 0;
  margin-top: 1px;
}

/* ===== EXPERIENCE ===== */
.experience-list {
  display: flex;
  flex-direction: column;
  gap: 24px;
  position: relative;
}

.experience-list::before {
  content: "";
  position: absolute;
  top: 40px;
  bottom: 40px;
  left: 47px;
  width: 2px;
  background: var(--border-light);
  z-index: 1;
}

.experience-card {
  position: relative;
  z-index: 2;
  display: grid;
  grid-template-columns: auto 1fr;
  gap: 28px;
  padding: 28px;
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: 18px;
  transition: all var(--transition-fast);
  box-shadow: 0 4px 20px rgba(0, 0, 0, 0.03);
}

.experience-card:hover {
  border-color: var(--accent);
  transform: translateY(-2px);
  box-shadow: 0 10px 32px rgba(0, 0, 0, 0.06);
}

.experience-number {
  width: 42px;
  height: 42px;
  display: flex;
  align-items: center;
  justify-content: center;
  background: var(--bg-secondary);
  border: 1px solid var(--border);
  border-radius: 12px;
  font-size: 14px;
  font-family: var(--font-mono);
  font-weight: 700;
  color: var(--accent);
}

.experience-content {
  flex: 1;
  min-width: 0;
}

.experience-period {
  font-family: var(--font-mono);
  font-size: 12px;
  font-weight: 500;
  color: var(--text-muted);
  margin-bottom: 8px;
  letter-spacing: 0.02em;
}

.experience-title {
  font-size: 20px;
  font-weight: 700;
  letter-spacing: -0.02em;
  margin-bottom: 10px;
}

.experience-description {
  font-size: 15px;
  color: var(--text-secondary);
  line-height: 1.65;
  margin-bottom: 14px;
}

.experience-bullets {
  list-style: none;
  display: flex;
  flex-direction: column;
  gap: 8px;
  margin-bottom: 16px;
}

.experience-bullets li {
  position: relative;
  padding-left: 18px;
  font-size: 14px;
  color: var(--text-secondary);
  line-height: 1.6;
}

.experience-bullets li::before {
  content: "";
  position: absolute;
  left: 0;
  top: 9px;
  width: 6px;
  height: 6px;
  border-radius: 50%;
  background: var(--accent);
}

.tags {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  margin-bottom: 16px;
}

.tag {
  font-size: 11px;
  font-family: var(--font-mono);
  font-weight: 500;
  padding: 4px 10px;
  border-radius: 6px;
  background: var(--bg-secondary);
  color: var(--text-secondary);
  border: 1px solid var(--border);
}

.experience-links {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
}

.experience-link {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  padding: 7px 14px;
  font-size: 12px;
  font-weight: 600;
  color: var(--accent);
  background: var(--accent-light);
  border: 1px solid rgba(234, 88, 12, 0.25);
  border-radius: 8px;
  transition: all var(--transition-fast);
}

.experience-link:hover {
  background: var(--accent);
  color: #ffffff;
}

/* ===== PUBLICATIONS ===== */
.publications-list {
  display: flex;
  flex-direction: column;
  gap: 16px;
}

.publication-card {
  display: grid;
  grid-template-columns: 1fr 220px;
  gap: 24px;
  padding: 24px 28px;
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: 16px;
  transition: all var(--transition-fast);
  box-shadow: 0 4px 16px rgba(0, 0, 0, 0.02);
}

.publication-card:hover {
  border-color: var(--accent);
  transform: translateY(-2px);
  box-shadow: 0 8px 24px rgba(0, 0, 0, 0.06);
}

.publication-card:hover .publication-title {
  color: var(--accent);
}

.pub-top {
  display: flex;
  align-items: center;
  gap: 10px;
  margin-bottom: 8px;
}

.pub-badge {
  font-size: 10.5px;
  font-family: var(--font-mono);
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.05em;
  padding: 3px 8px;
  border-radius: 6px;
  background: var(--bg-secondary);
  color: var(--accent);
  border: 1px solid var(--border);
}

.publication-title {
  font-size: 16.5px;
  font-weight: 600;
  line-height: 1.5;
  transition: color var(--transition-fast);
  margin-bottom: 8px;
}

.publication-authors {
  font-size: 13.5px;
  color: var(--text-secondary);
  line-height: 1.5;
}

.publication-authors .highlight {
  color: var(--accent);
  font-weight: 600;
}

.publication-meta {
  font-size: 12px;
  font-weight: 500;
  color: var(--text-muted);
  align-self: center;
  text-align: right;
  line-height: 1.5;
}

/* ===== PACKAGES ===== */
.packages-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(320px, 1fr));
  gap: 20px;
}

.package-card {
  display: flex;
  flex-direction: column;
  justify-content: space-between;
  padding: 24px;
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: 16px;
  transition: all var(--transition-fast);
  box-shadow: 0 4px 16px rgba(0, 0, 0, 0.02);
}

.package-card:hover {
  border-color: var(--accent);
  transform: translateY(-3px);
  box-shadow: 0 10px 30px rgba(0, 0, 0, 0.06);
}

.package-card:hover .package-name {
  color: var(--accent);
}

.package-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  margin-bottom: 8px;
}

.package-name {
  font-size: 18px;
  font-weight: 700;
  letter-spacing: -0.02em;
  transition: color var(--transition-fast);
}

.package-badge {
  font-size: 11px;
  font-family: var(--font-mono);
  font-weight: 600;
  padding: 2px 8px;
  border-radius: 999px;
  display: inline-flex;
  align-items: center;
  gap: 4px;
}

.package-badge.cran {
  background: rgba(37, 99, 235, 0.1);
  color: #2563eb;
  border: 1px solid rgba(37, 99, 235, 0.25);
}

body.dark-theme .package-badge.cran {
  background: rgba(96, 165, 250, 0.15);
  color: #60a5fa;
  border-color: rgba(96, 165, 250, 0.3);
}

.package-badge.github {
  background: var(--accent-light);
  color: var(--accent);
  border: 1px solid rgba(234, 88, 12, 0.25);
}

.package-badge.webgis {
  background: rgba(16, 185, 129, 0.1);
  color: #059669;
  border: 1px solid rgba(16, 185, 129, 0.25);
}

body.dark-theme .package-badge.webgis {
  background: rgba(52, 211, 153, 0.15);
  color: #34d399;
  border-color: rgba(52, 211, 153, 0.3);
}

.package-badge.webapp {
  background: rgba(139, 92, 246, 0.1);
  color: #7c3aed;
  border: 1px solid rgba(139, 92, 246, 0.25);
}

body.dark-theme .package-badge.webapp {
  background: rgba(167, 139, 250, 0.15);
  color: #a78bfa;
  border-color: rgba(167, 139, 250, 0.3);
}

.package-authors {
  font-size: 12px;
  color: var(--text-muted);
  margin-bottom: 12px;
}

.package-description {
  font-size: 14px;
  color: var(--text-secondary);
  line-height: 1.55;
  margin-bottom: 14px;
}

.package-tags {
  display: flex;
  flex-wrap: wrap;
  gap: 6px;
  margin-top: auto;
}

.package-tag {
  font-size: 10.5px;
  font-family: var(--font-mono);
  padding: 2px 7px;
  border-radius: 4px;
  background: var(--bg-secondary);
  color: var(--text-muted);
}

/* ===== SKILLS ===== */
.skills-categories {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(240px, 1fr));
  gap: 20px;
}

.skill-category {
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: 16px;
  padding: 24px;
  box-shadow: 0 4px 16px rgba(0, 0, 0, 0.02);
  transition: all var(--transition-fast);
}

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

.skill-category-title {
  font-size: 13px;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.08em;
  color: var(--accent);
  margin-bottom: 16px;
  display: flex;
  align-items: center;
  gap: 8px;
}

.skill-tags {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
}

.skill-pill {
  padding: 7px 13px;
  background: var(--bg-secondary);
  border: 1px solid var(--border);
  border-radius: 8px;
  font-size: 13px;
  font-weight: 500;
  color: var(--text-primary);
  transition: all var(--transition-fast);
}

.skill-pill:hover {
  background: var(--accent);
  color: #ffffff;
  border-color: var(--accent);
  transform: translateY(-1px);
}

/* ===== CONTACT ===== */
.contact-section {
  text-align: center;
  padding: 40px 0 20px;
}

.contact-title {
  font-size: clamp(32px, 4.5vw, 52px);
  font-weight: 800;
  letter-spacing: -0.03em;
  line-height: 1.1;
  margin-bottom: 16px;
}

.contact-subtitle {
  font-size: 18px;
  color: var(--text-secondary);
  max-width: 540px;
  margin: 0 auto 36px;
}

.contact-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(260px, 1fr));
  gap: 20px;
  max-width: 900px;
  margin: 0 auto;
}

.contact-card {
  display: flex;
  flex-direction: column;
  align-items: center;
  padding: 28px 20px;
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: 18px;
  box-shadow: 0 4px 16px rgba(0, 0, 0, 0.02);
  transition: all var(--transition-fast);
  color: inherit;
}

.contact-card:hover {
  border-color: var(--accent);
  transform: translateY(-3px);
  box-shadow: 0 12px 32px rgba(0, 0, 0, 0.06);
}

.contact-icon {
  width: 48px;
  height: 48px;
  border-radius: 12px;
  background: var(--accent-light);
  color: var(--accent);
  display: flex;
  align-items: center;
  justify-content: center;
  margin-bottom: 14px;
}

.contact-card-title {
  font-size: 16px;
  font-weight: 700;
  margin-bottom: 4px;
}

.contact-card-value {
  font-size: 13.5px;
  color: var(--text-secondary);
  font-family: var(--font-mono);
  word-break: break-all;
}

/* ===== FOOTER ===== */
.site-footer {
  padding: 36px 0;
  border-top: 1px solid var(--border-light);
}

.site-footer .container {
  display: flex;
  justify-content: space-between;
  align-items: center;
}

.footer-text {
  font-size: 13px;
  color: var(--text-muted);
}

.footer-text span {
  color: var(--accent);
}

.footer-back-to-top {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  font-size: 13px;
  font-weight: 500;
  color: var(--text-secondary);
  transition: color var(--transition-fast);
}

.footer-back-to-top:hover {
  color: var(--accent);
}

/* ===== MOBILE NAVIGATION ===== */
.mobile-nav {
  display: none;
  position: fixed;
  top: var(--header-height);
  left: 0;
  right: 0;
  bottom: 0;
  background: var(--bg-primary);
  padding: 24px;
  z-index: 99;
  opacity: 0;
  visibility: hidden;
  transition: opacity var(--transition-base), visibility var(--transition-base);
  overflow-y: auto;
}

.mobile-nav.active {
  display: flex;
  flex-direction: column;
  opacity: 1;
  visibility: visible;
}

.mobile-nav a {
  display: block;
  padding: 14px 0;
  font-size: 18px;
  font-weight: 600;
  color: var(--text-primary);
  border-bottom: 1px solid var(--border-light);
}

.mobile-nav a:hover,
.mobile-nav a.active {
  color: var(--accent);
}

.mobile-nav-footer {
  margin-top: auto;
  padding-top: 24px;
  display: flex;
  flex-direction: column;
  gap: 12px;
}

/* ===== RESPONSIVE ===== */
@media (max-width: 900px) {
  :root {
    --section-padding: 72px;
  }

  .hero {
    min-height: auto;
    padding: 48px 0 72px;
    text-align: center;
  }

  .hero .container {
    grid-template-columns: 1fr;
    gap: 40px;
  }

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

  .hero-image {
    order: -1;
  }

  .hero-card {
    padding: 20px;
  }

  .profile-wrapper {
    width: 160px;
    height: 160px;
  }

  .education-grid {
    grid-template-columns: 1fr;
    gap: 24px;
  }

  .experience-list::before {
    left: 20px;
  }

  .experience-card {
    grid-template-columns: 1fr;
    gap: 16px;
    padding: 24px;
  }

  .publication-card {
    grid-template-columns: 1fr;
    gap: 14px;
  }

  .publication-meta {
    text-align: left;
  }

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

@media (max-width: 640px) {
  :root {
    --container-max: 100%;
    --section-padding: 56px;
  }

  .container {
    width: calc(100% - 32px);
  }

  .site-nav {
    display: none;
  }

  .menu-toggle {
    display: flex;
  }

  .hero-title {
    font-size: 34px;
  }

  .hero-role {
    font-size: 17px;
  }

  .hero-description {
    font-size: 15px;
  }

  .hero-actions {
    flex-direction: column;
    width: 100%;
    max-width: 320px;
  }

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

  .profile-wrapper {
    width: 140px;
    height: 140px;
  }

  .section-header {
    flex-direction: column;
    align-items: flex-start;
    gap: 12px;
    margin-bottom: 32px;
  }

  .experience-list::before {
    display: none;
  }

  .experience-card {
    padding: 20px;
  }

  .contact-section {
    padding: 30px 0 10px;
  }

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

  .site-footer .container {
    flex-direction: column;
    gap: 12px;
    text-align: center;
  }
}

/* ===== ANIMATIONS ===== */
@keyframes fadeInUp {
  from {
    opacity: 0;
    transform: translateY(20px);
  }
  to {
    opacity: 1;
    transform: translateY(0);
  }
}

.hero-content {
  animation: fadeInUp 0.6s ease forwards;
}

.hero-image {
  animation: fadeInUp 0.6s 0.15s ease forwards;
  opacity: 0;
}

@media (prefers-reduced-motion: reduce) {
  *,
  *::before,
  *::after {
    animation-duration: 0.01ms !important;
    animation-iteration-count: 1 !important;
    transition-duration: 0.01ms !important;
  }
}