:root {
  --color-bg: #ffffff;
  --color-bg-alt: #f5f8fc;
  --color-surface: #ffffff;
  --color-text: #0f1b2d;
  --color-text-muted: #55657a;
  --color-border: #e2e8f0;
  --color-primary: #1d5fd1;
  --color-primary-dark: #164aa6;
  --color-primary-soft: #e8f0fd;
  --radius: 14px;
  --shadow: 0 1px 2px rgba(15, 27, 45, 0.04), 0 8px 24px rgba(15, 27, 45, 0.06);
  --font: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "Helvetica Neue", Arial, sans-serif;
  --header-h: 68px;
}

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

html {
  scroll-behavior: smooth;
  scroll-padding-top: var(--header-h);
}

body {
  margin: 0;
  font-family: var(--font);
  font-size: 17px;
  line-height: 1.65;
  color: var(--color-text);
  background: var(--color-bg);
  -webkit-font-smoothing: antialiased;
}

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

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

a:hover {
  color: var(--color-primary-dark);
}

h1, h2, h3 {
  line-height: 1.2;
  margin: 0;
}

.container {
  width: 100%;
  max-width: 1080px;
  margin: 0 auto;
  padding: 0 20px;
}

/* ---------- Header ---------- */
.site-header {
  position: sticky;
  top: 0;
  z-index: 10;
  height: var(--header-h);
  background: rgba(255, 255, 255, 0.9);
  backdrop-filter: saturate(180%) blur(10px);
  -webkit-backdrop-filter: saturate(180%) blur(10px);
  border-bottom: 1px solid transparent;
  transition: border-color 0.2s;
}

.site-header.scrolled {
  border-bottom-color: var(--color-border);
}

.header-inner {
  height: 100%;
  display: flex;
  align-items: center;
  gap: 24px;
}

.logo {
  display: flex;
  align-items: center;
  gap: 10px;
  color: var(--color-text);
  font-weight: 700;
}

.logo:hover {
  color: var(--color-text);
}

.logo-mark {
  display: grid;
  place-items: center;
  width: 36px;
  height: 36px;
  border-radius: 10px;
  background: var(--color-primary);
  color: #fff;
  font-size: 14px;
  letter-spacing: 0.5px;
}

.nav {
  display: flex;
  gap: 28px;
  margin-left: auto;
}

.nav a {
  color: var(--color-text-muted);
  font-size: 15px;
  font-weight: 500;
}

.nav a:hover {
  color: var(--color-primary);
}

.lang-switch {
  display: flex;
  border: 1px solid var(--color-border);
  border-radius: 999px;
  padding: 3px;
}

.lang-switch button {
  font: inherit;
  font-size: 13px;
  font-weight: 600;
  border: 0;
  background: transparent;
  color: var(--color-text-muted);
  padding: 4px 12px;
  border-radius: 999px;
  cursor: pointer;
}

.lang-switch button[aria-pressed="true"] {
  background: var(--color-primary);
  color: #fff;
}

/* ---------- Hero ---------- */
.hero {
  padding: 72px 0 88px;
  background:
    radial-gradient(1000px 400px at 85% 0%, var(--color-primary-soft), transparent 70%),
    var(--color-bg);
}

.hero-inner {
  display: grid;
  grid-template-columns: 1.3fr 1fr;
  align-items: center;
  gap: 56px;
}

.eyebrow {
  margin: 0 0 12px;
  font-size: 14px;
  font-weight: 600;
  letter-spacing: 1.5px;
  text-transform: uppercase;
  color: var(--color-primary);
}

.hero h1 {
  font-size: clamp(2.4rem, 5vw, 3.5rem);
  letter-spacing: -0.02em;
}

.hero-role {
  margin: 10px 0 0;
  font-size: clamp(1.15rem, 2.2vw, 1.4rem);
  font-weight: 600;
  color: var(--color-text);
}

.hero-lead {
  margin: 18px 0 0;
  max-width: 34em;
  color: var(--color-text-muted);
}

.hero-actions {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  margin-top: 28px;
}

.hero-meta {
  margin: 20px 0 0;
  font-size: 14px;
  color: var(--color-text-muted);
}

.btn {
  display: inline-block;
  padding: 12px 24px;
  border-radius: 10px;
  font-weight: 600;
  font-size: 15px;
  transition: background 0.15s, color 0.15s, border-color 0.15s;
}

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

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

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

.btn-secondary:hover {
  border-color: var(--color-primary);
  color: var(--color-primary);
}

.hero-photo {
  justify-self: center;
  position: relative;
}

.hero-photo::before {
  content: "";
  position: absolute;
  inset: 14px -14px -14px 14px;
  border-radius: 24px;
  background: var(--color-primary-soft);
  border: 1px solid #cfdcf5;
}

.hero-photo img {
  position: relative;
  width: 340px;
  height: 340px;
  object-fit: cover;
  border-radius: 24px;
  box-shadow: var(--shadow);
}

/* ---------- Sections ---------- */
.section {
  padding: 88px 0;
}

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

.section-title {
  font-size: clamp(1.7rem, 3vw, 2.1rem);
  margin-bottom: 40px;
  letter-spacing: -0.01em;
}

.section-title::after {
  content: "";
  display: block;
  width: 48px;
  height: 4px;
  margin-top: 14px;
  border-radius: 2px;
  background: var(--color-primary);
}

/* About */
.about-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 48px;
  align-items: start;
}

.about-text p {
  margin: 0 0 16px;
  color: var(--color-text-muted);
}

.services {
  display: grid;
  gap: 16px;
}

.service-card {
  display: grid;
  grid-template-columns: auto 1fr;
  column-gap: 16px;
  padding: 20px;
  border: 1px solid var(--color-border);
  border-radius: var(--radius);
  background: var(--color-surface);
}

.service-icon {
  grid-row: span 2;
  display: grid;
  place-items: center;
  width: 44px;
  height: 44px;
  border-radius: 10px;
  background: var(--color-primary-soft);
}

.service-icon svg {
  width: 22px;
  height: 22px;
  fill: none;
  stroke: var(--color-primary);
  stroke-width: 2;
  stroke-linecap: round;
  stroke-linejoin: round;
}

.service-card h3 {
  font-size: 1.05rem;
  align-self: end;
}

.service-card p {
  margin: 4px 0 0;
  font-size: 15px;
  color: var(--color-text-muted);
}

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

.skill-group {
  padding: 24px;
  border-radius: var(--radius);
  background: var(--color-surface);
  border: 1px solid var(--color-border);
}

.skill-group h3 {
  font-size: 1.05rem;
  margin-bottom: 16px;
}

.tags {
  list-style: none;
  margin: 0;
  padding: 0;
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
}

.tags li {
  padding: 6px 14px;
  border-radius: 999px;
  font-size: 14px;
  font-weight: 500;
  background: var(--color-primary-soft);
  color: var(--color-primary-dark);
}

/* Education */
.timeline {
  list-style: none;
  margin: 0;
  padding: 0 0 0 28px;
  border-left: 2px solid var(--color-border);
}

.timeline-item {
  position: relative;
  padding-bottom: 36px;
}

.timeline-item:last-child {
  padding-bottom: 0;
}

.timeline-item::before {
  content: "";
  position: absolute;
  left: -37px;
  top: 4px;
  width: 16px;
  height: 16px;
  border-radius: 50%;
  background: var(--color-bg);
  border: 3px solid var(--color-primary);
}

.timeline-badge {
  display: inline-block;
  margin-bottom: 8px;
  padding: 2px 10px;
  border-radius: 999px;
  font-size: 12px;
  font-weight: 600;
  letter-spacing: 0.5px;
  text-transform: uppercase;
  background: var(--color-primary);
  color: #fff;
}

.timeline-badge-muted {
  background: var(--color-border);
  color: var(--color-text-muted);
}

.timeline-item h3 {
  font-size: 1.2rem;
}

.timeline-item p {
  margin: 4px 0 0;
  color: var(--color-text-muted);
}

.timeline-item .timeline-sub {
  color: var(--color-text);
  font-weight: 500;
}

/* Contact */
.contact-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 20px;
}

.card {
  padding: 28px;
  border-radius: var(--radius);
  background: var(--color-surface);
  border: 1px solid var(--color-border);
  box-shadow: var(--shadow);
}

.card h3 {
  font-size: 1.15rem;
  margin-bottom: 20px;
}

.contact-list {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  gap: 14px;
}

.contact-list li {
  display: flex;
  flex-direction: column;
}

.contact-label,
.billing dt {
  font-size: 13px;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.5px;
  color: var(--color-text-muted);
}

.contact-list a {
  font-size: 1.05rem;
  font-weight: 500;
  word-break: break-word;
}

.socials {
  display: flex;
  gap: 10px;
  margin-top: 24px;
}

.socials a {
  display: grid;
  place-items: center;
  width: 42px;
  height: 42px;
  border-radius: 10px;
  border: 1px solid var(--color-border);
  transition: background 0.15s, border-color 0.15s;
}

.socials svg {
  width: 19px;
  height: 19px;
  fill: var(--color-text-muted);
  transition: fill 0.15s;
}

.socials a:hover {
  background: var(--color-primary);
  border-color: var(--color-primary);
}

.socials a:hover svg {
  fill: #fff;
}

.billing {
  margin: 0;
  display: grid;
  gap: 14px;
}

.billing dd {
  margin: 2px 0 0;
  font-weight: 500;
}

.billing-note {
  margin: 20px 0 0;
  font-size: 13px;
  color: var(--color-text-muted);
}

/* ---------- Footer ---------- */
.site-footer {
  padding: 28px 0;
  border-top: 1px solid var(--color-border);
  font-size: 14px;
  color: var(--color-text-muted);
}

.footer-inner {
  display: flex;
  flex-wrap: wrap;
  justify-content: space-between;
  gap: 8px;
}

.footer-inner p {
  margin: 0;
}

/* ---------- Responsive ---------- */
@media (max-width: 860px) {
  .nav {
    display: none;
  }

  .lang-switch {
    margin-left: auto;
  }

  .hero {
    padding: 48px 0 64px;
  }

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

  .hero-photo {
    order: -1;
  }

  .hero-photo img {
    width: 220px;
    height: 220px;
  }

  .hero-lead {
    margin-left: auto;
    margin-right: auto;
  }

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

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

  .section {
    padding: 64px 0;
  }
}

@media (max-width: 420px) {
  body {
    font-size: 16px;
  }

  .container {
    padding: 0 16px;
  }

  .logo-text {
    display: none;
  }

  .card {
    padding: 22px;
  }
}