:root {
  --color-background: #1A1A2E;
  --color-surface: #252542;
  --color-surface-2: #2E2E50;
  --color-text: #E0E0E0;
  --color-text-muted: #A0A0B0;
  --color-primary: #3ee6cd;
  --color-primary-hover: #5af5d9;
  --color-secondary: #6C3EFF;
  --color-success: #2ecc71;
  --color-warning: #f39c12;
  --color-error: #e74c3c;
  --color-border: #3A3A5C;
  --color-border-strong: #50507A;

  --text-xs: 0.75rem;
  --text-sm: 0.875rem;
  --text-base: 1rem;
  --text-lg: 1.125rem;
  --text-xl: 1.25rem;
  --text-2xl: 1.5rem;
  --text-3xl: 1.875rem;

  --font-light: 300;
  --font-normal: 400;
  --font-medium: 500;
  --font-semibold: 600;
  --font-bold: 700;

  --space-1: 0.25rem;
  --space-2: 0.5rem;
  --space-3: 0.75rem;
  --space-4: 1rem;
  --space-5: 1.25rem;
  --space-6: 1.5rem;
  --space-8: 2rem;
  --space-10: 2.5rem;
  --space-12: 3rem;
  --space-16: 4rem;

  --radius-none: 0;
  --radius-sm: 0.25rem;
  --radius-md: 0.5rem;
  --radius-lg: 0.75rem;
  --radius-xl: 1rem;
  --radius-full: 9999px;

  --shadow-none: none;
  --shadow-sm: 0 1px 3px rgba(0, 0, 0, 0.3);
  --shadow-md: 0 4px 12px rgba(0, 0, 0, 0.4);
  --shadow-lg: 0 18px 50px -18px rgba(0, 0, 0, 0.7);
  --shadow-xl: 0 12px 36px rgba(0, 0, 0, 0.6);

  --max-width: 1200px;
  --font-head: 'Raleway', 'Inter', 'SF Pro Display', -apple-system, BlinkMacSystemFont, 'Segoe UI', sans-serif;
  --font-body: 'Raleway', system-ui, -apple-system, sans-serif;
}

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

html { scroll-behavior: smooth; }

body {
  margin: 0;
  font-family: var(--font-body);
  background: var(--color-background);
  color: var(--color-text);
  line-height: 1.65;
  -webkit-font-smoothing: antialiased;
}

h1, h2, h3, h4 {
  font-family: var(--font-head);
  line-height: 1.15;
  margin: 0 0 0.5em;
  letter-spacing: -0.01em;
}

p { margin: 0 0 1em; }
a { color: var(--color-primary); text-decoration: none; }
a:hover { text-decoration: underline; }

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

.container {
  max-width: var(--max-width);
  margin: 0 auto;
  padding: 0 var(--space-6);
}

section { padding: var(--space-16) 0; position: relative; }

.section-head { max-width: 640px; margin-bottom: var(--space-12); }
.section-head h2 { font-size: clamp(1.7rem, 3.5vw, 2.4rem); }
.section-head p { color: var(--color-text-muted); margin: var(--space-3) 0 0; }
.eyebrow {
  font-family: var(--font-head);
  font-size: var(--text-xs);
  letter-spacing: 0.18em;
  text-transform: uppercase;
  color: var(--color-primary);
  margin-bottom: var(--space-4);
  display: block;
}

.btn {
  display: inline-block;
  font-family: var(--font-head);
  font-weight: var(--font-semibold);
  font-size: 0.95rem;
  padding: var(--space-3) var(--space-6);
  border-radius: var(--radius-full);
  border: 1px solid transparent;
  cursor: pointer;
  transition: transform 0.2s ease-out, box-shadow 0.2s ease-out, background 0.2s ease-out, color 0.2s ease-out;
}
.btn:hover { text-decoration: none; transform: translateY(-1px); }
.btn-primary {
  background: var(--color-primary);
  color: #04120f;
  box-shadow: 0 10px 30px -12px rgba(36, 202, 188, 0.55);
}
.btn-primary:hover { box-shadow: 0 14px 34px -12px rgba(36, 202, 188, 0.7); background: var(--color-primary-hover); }
.btn-ghost {
  background: transparent;
  color: var(--color-text);
  border-color: var(--color-border-strong);
}
.btn-ghost:hover { background: rgba(62, 230, 205, 0.08); }

header {
  position: fixed;
  top: 0; left: 0; right: 0;
  z-index: 100;
  background: rgba(26, 26, 46, 0.85);
  backdrop-filter: blur(12px);
  -webkit-backdrop-filter: blur(12px);
  border-bottom: 1px solid transparent;
  transition: border-color 0.25s ease, background 0.25s ease;
}
header.scrolled {
  border-bottom-color: var(--color-border);
  background: rgba(26, 26, 46, 0.95);
}
.nav {
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: var(--space-12);
}
.nav-brand {
  display: flex;
  align-items: center;
  gap: var(--space-3);
  font-family: var(--font-head);
  font-weight: var(--font-bold);
  letter-spacing: 0.02em;
  color: var(--color-text);
}
.nav-brand:hover { text-decoration: none; }
.nav-brand img { height: 34px; width: 34px; }
.nav-links { display: flex; align-items: center; gap: var(--space-8); list-style: none; margin: 0; padding: 0; }
.nav-links a {
  color: var(--color-text-muted);
  font-size: 0.95rem;
  font-weight: var(--font-medium);
  position: relative;
}
.nav-links a:hover { color: var(--color-primary); text-decoration: none; }
.nav-cta { padding: var(--space-2) var(--space-5) !important; }
.nav-toggle {
  display: none;
  background: none;
  border: 1px solid var(--color-border-strong);
  border-radius: var(--radius-md);
  color: var(--color-text);
  padding: var(--space-2);
  cursor: pointer;
  line-height: 0;
}
.nav-toggle svg { width: 22px; height: 22px; }

.theme-toggle {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  background: none;
  border: 1px solid var(--color-border-strong);
  border-radius: var(--radius-md);
  color: var(--color-text);
  padding: 6px 8px;
  cursor: pointer;
  font-size: 1.1rem;
  line-height: 1;
  transition: border-color 0.2s ease, color 0.2s ease;
}
.theme-toggle:hover { border-color: var(--color-primary); color: var(--color-primary); }
.theme-toggle .icon-sun { display: none; }
.theme-toggle .icon-moon { display: inline; }
[data-theme="light"] .theme-toggle .icon-sun { display: inline; }
[data-theme="light"] .theme-toggle .icon-moon { display: none; }

.lang-switcher {
  display: flex;
  gap: 2px;
  margin-left: var(--space-2);
}
.lang-switcher a {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  padding: 4px 8px;
  border-radius: var(--radius-sm);
  font-size: 0.75rem;
  font-weight: 500;
  color: var(--color-text-muted);
  text-decoration: none;
  transition: color 0.2s ease, background-color 0.2s ease;
}
.lang-switcher a:hover {
  color: var(--color-text);
  background-color: var(--color-bg-hover);
}
.lang-switcher a.active {
  color: var(--color-primary);
  background-color: var(--color-surface);
}

.hero {
  padding: 168px 0 var(--space-16);
  overflow: hidden;
}
.hero-inner {
  display: grid;
  grid-template-columns: 1.15fr 0.85fr;
  gap: var(--space-12);
  align-items: center;
}
.hero-tagline {
  display: inline-flex;
  align-items: center;
  gap: var(--space-2);
  font-family: var(--font-head);
  font-size: 0.82rem;
  letter-spacing: 0.04em;
  color: var(--color-primary);
  border: 1px solid var(--color-border-strong);
  background: rgba(62, 230, 205, 0.06);
  padding: var(--space-2) var(--space-4);
  border-radius: var(--radius-full);
  margin-bottom: var(--space-6);
}
.hero-tagline .dot {
  width: var(--space-2); height: var(--space-2);
  border-radius: 50%;
  background: var(--color-primary);
  animation: pulse 2s infinite;
}
@keyframes pulse {
  0%, 100% { box-shadow: 0 0 0 0 rgba(62, 230, 205, 0.5); }
  50% { box-shadow: 0 0 0 6px rgba(62, 230, 205, 0); }
}
.hero h1 { font-size: clamp(2.3rem, 5.5vw, 3.6rem); margin-bottom: var(--space-5); }
.hero h1 .accent-text {
  background: linear-gradient(120deg, #24cabc, #2aa2a5);
  -webkit-background-clip: text;
  background-clip: text;
  -webkit-text-fill-color: transparent;
  color: transparent;
}
.hero-sub { font-size: 1.12rem; color: var(--color-text-muted); max-width: 54ch; margin-bottom: var(--space-8); }
.hero-actions { display: flex; gap: var(--space-4); flex-wrap: wrap; }
.hero-note { margin-top: var(--space-6); color: var(--color-text-muted); font-size: 0.9rem; }

.hero-photo { position: relative; }
.hero-photo::before {
  content: "";
  position: absolute;
  inset: -18px;
  background-image: url('../assets/img/bg-logo.svg');
  background-size: cover;
  background-position: center;
  opacity: 0.22;
  filter: blur(1px);
  z-index: 0;
}
.hero-photo img {
  position: relative;
  z-index: 1;
  border-radius: var(--radius-lg);
  border: 1px solid var(--color-border-strong);
  box-shadow: var(--shadow-lg);
  aspect-ratio: 1 / 1;
  object-fit: cover;
}

.cards-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
  gap: var(--space-5);
}
.card {
  background: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-md);
  padding: var(--space-7, 28px) var(--space-6);
  transition: border-color 0.25s ease, transform 0.25s ease, box-shadow 0.25s ease;
  position: relative;
  overflow: hidden;
}
.card::before {
  content: "";
  position: absolute;
  top: 0; left: 0; right: 0;
  height: 2px;
  background: linear-gradient(90deg, var(--color-primary), transparent);
  opacity: 0.55;
}
.card:hover { border-color: var(--color-border-strong); transform: translateY(-3px); box-shadow: var(--shadow-md); }
.card-icon {
  width: 46px; height: 46px;
  display: grid;
  place-items: center;
  border-radius: var(--radius-md);
  background: rgba(62, 230, 205, 0.09);
  border: 1px solid var(--color-border);
  margin-bottom: var(--space-5);
}
.card-icon svg { width: 24px; height: 24px; stroke: var(--color-primary); }
.card h3 { font-size: var(--text-lg); margin-bottom: var(--space-3); }
.card p { color: var(--color-text-muted); font-size: 0.94rem; margin-bottom: var(--space-4); }
.card-tags { display: flex; flex-wrap: wrap; gap: var(--space-2); }
.tag {
  font-size: var(--text-xs);
  color: var(--color-primary);
  border: 1px solid var(--color-border);
  background: rgba(62, 230, 205, 0.05);
  border-radius: var(--radius-full);
  padding: var(--space-1) var(--space-3);
  font-weight: var(--font-medium);
}

.projects-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(320px, 1fr));
  gap: var(--space-5);
}
.project {
  background: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-md);
  padding: var(--space-6) var(--space-6) var(--space-5);
  display: flex;
  flex-direction: column;
  transition: border-color 0.25s ease, transform 0.25s ease, box-shadow 0.25s ease;
}
.project:hover { border-color: var(--color-border-strong); transform: translateY(-3px); box-shadow: var(--shadow-md); }
.project-role {
  font-family: var(--font-head);
  font-size: var(--text-xs);
  letter-spacing: 0.12em;
  text-transform: uppercase;
  color: var(--color-primary);
  margin-bottom: var(--space-2);
}
.project h3 { font-size: var(--text-base); font-weight: var(--font-semibold); margin-bottom: var(--space-2); }
.project p { color: var(--color-text-muted); font-size: 0.92rem; flex-grow: 1; }
.project .project-meta { margin-top: var(--space-4); display: flex; align-items: center; gap: var(--space-3); font-size: 0.84rem; color: var(--color-text-muted); }
.project .project-meta a { color: var(--color-primary); }
.project .project-meta a:hover { text-decoration: none; color: var(--color-primary-hover); }
.project .arrow { transition: transform 0.2s ease; }
.project:hover .arrow { transform: translate(3px, -3px); }

.values { margin: var(--space-6) 0 0; padding: 0; list-style: none; }
.values li {
  display: flex;
  gap: var(--space-3);
  align-items: baseline;
  padding: var(--space-2) 0;
  border-bottom: 1px solid var(--color-border);
  color: var(--color-text-muted);
}
.values li svg { width: 16px; height: 16px; flex-shrink: 0; transform: translateY(2px); stroke: var(--color-primary); }
.contact-card {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(230px, 1fr));
  gap: var(--space-5);
  background: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-md);
  padding: var(--space-8);
}
.contact-item a { color: var(--color-text); font-weight: var(--font-medium); }
.contact-item a:hover { color: var(--color-primary); text-decoration: none; }
.contact-item .label {
  font-family: var(--font-head);
  font-size: var(--text-xs);
  letter-spacing: 0.14em;
  text-transform: uppercase;
  color: var(--color-text-muted);
  display: block;
  margin-bottom: var(--space-2);
}
.open-line {
  margin-top: var(--space-7, 28px);
  border: 1px dashed var(--color-border-strong);
  border-radius: var(--radius-md);
  padding: var(--space-5) var(--space-6);
  color: var(--color-text-muted);
  background: rgba(62, 230, 205, 0.04);
}
.open-line strong { color: var(--color-primary); }

footer {
  border-top: 1px solid var(--color-border);
  padding: var(--space-10) 0 var(--space-12);
}
.footer-inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: var(--space-6);
  flex-wrap: wrap;
}
.footer-brand { display: flex; align-items: center; gap: var(--space-3); font-family: var(--font-head); font-weight: var(--font-bold); color: var(--color-text); }
.footer-brand img { height: 28px; width: 28px; }
.footer-links { display: flex; gap: var(--space-6); }
.footer-links a { color: var(--color-text-muted); font-size: 0.9rem; }
.footer-links a:hover { color: var(--color-primary); }
.footer-copy { color: var(--color-text-muted); font-size: 0.85rem; width: 100%; margin-top: var(--space-5); text-align: center; }

.reveal { opacity: 0; transform: translateY(22px); transition: opacity 0.6s ease, transform 0.6s ease; }
.reveal.visible { opacity: 1; transform: none; }

.cv-header {
  padding: 150px 0 var(--space-10);
  border-bottom: 1px solid var(--color-border);
  background: linear-gradient(180deg, rgba(37,37,66,0.6) 0%, transparent 100%);
}
.cv-header .container { display: flex; align-items: center; justify-content: space-between; gap: var(--space-6); flex-wrap: wrap; }
.cv-header h1 { margin-bottom: var(--space-2); }
.cv-header p { color: var(--color-text-muted); margin: 0 0 var(--space-4); }
.cv-download .btn-primary {
  box-shadow: 0 10px 30px -12px rgba(36,202,188,0.55);
  transition: box-shadow 0.3s ease, transform 0.3s ease;
}
.cv-download .btn-primary:hover {
  box-shadow: 0 14px 34px -12px rgba(36,202,188,0.7);
  transform: translateY(-2px);
}
.cv-section .card-tags .tag {
  text-decoration: none;
  cursor: pointer;
  transition: color 0.2s, border-color 0.2s, background 0.2s;
}
.cv-section .card-tags .tag:hover {
  color: var(--color-primary);
  border-color: var(--color-primary);
}
.cv-section .card-tags .tag.active {
  color: var(--color-primary);
  border-color: var(--color-primary);
  background: rgba(62,230,205,0.08);
}
.cv-body { padding: var(--space-12) 0 var(--space-16); }
.cv-section { max-width: 780px; margin-bottom: var(--space-12); }
.cv-section h2 {
  font-size: var(--text-xl);
  display: flex;
  align-items: center;
  gap: var(--space-3);
  padding-bottom: var(--space-3);
  border-bottom: 1px solid var(--color-border);
  margin-bottom: var(--space-5);
}
.cv-section h2::before {
  content: "";
  width: var(--space-2); height: var(--space-2);
  border-radius: var(--radius-sm);
  background: linear-gradient(135deg, var(--color-primary), var(--color-secondary));
}
.cv-entry { margin-bottom: var(--space-5); }
.cv-entry-head { display: flex; justify-content: space-between; gap: var(--space-4); flex-wrap: wrap; }
.cv-entry h3 { font-size: var(--text-base); margin-bottom: 2px; }
.cv-entry .org { color: var(--color-primary); font-weight: var(--font-semibold); font-size: 0.92rem; }
.cv-entry .when { color: var(--color-text-muted); font-size: 0.85rem; font-family: var(--font-head); white-space: nowrap; }
.cv-entry p { color: var(--color-text-muted); font-size: 0.93rem; margin: var(--space-2) 0 0; }
.cv-list { margin: var(--space-2) 0 0; padding-left: var(--space-5); color: var(--color-text-muted); font-size: 0.93rem; }
.cv-list li { margin-bottom: var(--space-2); }
.cv-skill-cluster { margin-bottom: var(--space-4); }
.cv-skill-cluster h3 { font-size: 0.9rem; color: var(--color-text-muted); margin-bottom: var(--space-2); }
.skill-pill { display: inline-block; padding: 3px 10px; border: 1px solid var(--color-primary); border-radius: 9999px; font-size: 0.85rem; color: var(--color-primary); margin: 0 4px 4px 0; }
.skill-tools { font-size: 0.85rem; color: var(--color-text-muted); margin-top: var(--space-2); }
.cv-download { display: flex; gap: var(--space-4); align-items: center; flex-wrap: wrap; }

.cv-section a { color: inherit; text-decoration: underline; text-decoration-color: var(--color-border); text-underline-offset: 2px; transition: color 0.2s, text-decoration-color 0.2s; }
.cv-section a:hover { color: var(--color-primary); text-decoration-color: var(--color-primary); }

[data-theme="light"] {
  --color-background: #F0F2F5;
  --color-surface: #FFFFFF;
  --color-surface-2: #E8EAED;
  --color-text: #1A1A2E;
  --color-text-muted: #5A5A7A;
  --color-primary: #0097A7;
  --color-primary-hover: #00838F;
  --color-border: #D0D0E0;
  --color-border-strong: #B0B0C8;
  --shadow-sm: 0 1px 3px rgba(0, 0, 0, 0.08);
  --shadow-md: 0 4px 12px rgba(0, 0, 0, 0.1);
  --shadow-lg: 0 18px 50px -18px rgba(0, 0, 0, 0.15);
  --shadow-xl: 0 12px 36px rgba(0, 0, 0, 0.12);
}

[data-theme="light"] .btn-primary {
  box-shadow: 0 10px 30px -12px rgba(0, 151, 167, 0.35);
}
[data-theme="light"] .btn-primary:hover {
  box-shadow: 0 14px 34px -12px rgba(0, 151, 167, 0.5);
}
[data-theme="light"] .card::before {
  background: linear-gradient(90deg, var(--color-primary), transparent);
  opacity: 0.35;
}
[data-theme="light"] .hero-tagline {
  background: rgba(0, 151, 167, 0.06);
}
[data-theme="light"] .open-line {
  background: rgba(0, 151, 167, 0.04);
}
[data-theme="light"] header {
  background: rgba(240, 242, 245, 0.85);
}
[data-theme="light"] header.scrolled {
  background: rgba(240, 242, 245, 0.95);
}
[data-theme="light"] .cv-header {
  background: linear-gradient(180deg, rgba(0,151,167,0.06) 0%, transparent 100%);
}
[data-theme="light"] .cv-download .btn-primary {
  box-shadow: 0 10px 30px -12px rgba(0,151,167,0.35);
}
[data-theme="light"] .cv-download .btn-primary:hover {
  box-shadow: 0 14px 34px -12px rgba(0,151,167,0.5);
}
[data-theme="light"] .cv-section .card-tags .tag.active {
  background: rgba(0,151,167,0.08);
}
[data-theme="light"] .hero-tagline .dot {
  animation: pulse-light 2s infinite;
}
@keyframes pulse-light {
  0%, 100% { box-shadow: 0 0 0 0 rgba(0, 151, 167, 0.5); }
  50% { box-shadow: 0 0 0 6px rgba(0, 151, 167, 0); }
}

@media (max-width: 900px) {
  .hero-inner { grid-template-columns: 1fr; gap: var(--space-10); }
  .hero { padding: 140px 0 var(--space-12); }
  .hero-photo { max-width: 380px; margin: 0 auto; }
  .projects-grid { grid-template-columns: 1fr; }
}

@media (max-width: 720px) {
  .nav-toggle { display: block; }
  .theme-toggle { display: inline-flex; }
  .nav-links {
    position: absolute;
    top: var(--space-12); left: 0; right: 0;
    flex-direction: column;
    align-items: stretch;
    gap: 0;
    background: var(--color-surface);
    border-bottom: 1px solid var(--color-border);
    padding: var(--space-2) var(--space-6) var(--space-5);
    display: none;
  }
  .nav-links.open { display: flex; }
  .nav-links a { padding: var(--space-3) 0; border-bottom: 1px solid var(--color-border); }
  .nav-links .nav-cta { border: none; }
  .lang-switcher {
    position: absolute;
    top: var(--space-12);
    right: var(--space-12);
    background: var(--color-surface);
    border: 1px solid var(--color-border);
    border-radius: var(--radius-md);
    padding: 2px;
    z-index: 10;
  }
  section { padding: var(--space-12) 0; }
  .contact-card { padding: var(--space-6); }
}

@media (prefers-reduced-motion: reduce) {
  html { scroll-behavior: auto; }
  .reveal { opacity: 1; transform: none; transition: none; }
  .hero-tagline .dot { animation: none; }
  .card, .project { transform: none; }
}