:root {
  --bg: #f5f7fb;
  --bg-alt: #ffffff;
  --text: #101827;
  --muted: #6b7280;
  --border-subtle: #e5e7eb;
  --accent: #2563eb; /* blue */
  --accent-soft: rgba(37, 99, 235, 0.1);
  --radius-lg: 18px;
  --radius-md: 12px;
  --shadow-soft: 0 18px 40px rgba(15, 23, 42, 0.08);
  --font-main: "Inter", system-ui, -apple-system, BlinkMacSystemFont, sans-serif;
}

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

html,
body {
  margin: 0;
  padding: 0;
}

body {
  font-family: var(--font-main);
  color: var(--text);
  background: radial-gradient(circle at top left, #e0edff, #f5f7fb 55%, #ffffff 100%);
  -webkit-font-smoothing: antialiased;
}

/* Layout helpers */

.container {
  width: 100%;
  max-width: 1040px;
  margin: 0 auto;
  padding: 0 1.5rem;
}

.section {
  padding: 4.5rem 0;
}

.section-alt {
  background-color: rgba(255, 255, 255, 0.85);
  backdrop-filter: blur(8px);
}

/* Header */

.site-header {
  position: sticky;
  top: 0;
  z-index: 50;
  backdrop-filter: blur(12px);
  background: linear-gradient(to bottom, rgba(245, 247, 251, 0.9), rgba(245, 247, 251, 0.75));
  border-bottom: 1px solid rgba(226, 232, 240, 0.7);
}

.header-inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: 64px;
}

.logo {
  font-weight: 700;
  letter-spacing: 0.02em;
  text-decoration: none;
  color: var(--text);
  font-size: 1rem;
}

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

.nav {
  display: flex;
  align-items: center;
}

.nav-links {
  display: flex;
  gap: 1.5rem;
  list-style: none;
  margin: 0;
  padding: 0;
}

.nav-links a {
  text-decoration: none;
  font-size: 0.95rem;
  color: var(--muted);
  font-weight: 500;
  padding-bottom: 0.1rem;
  border-bottom: 2px solid transparent;
  transition: color 0.15s ease, border-color 0.15s ease;
}

.nav-links a:hover {
  color: var(--accent);
  border-color: var(--accent-soft);
}

.nav-toggle {
  display: none;
  background: none;
  border: none;
  font-size: 1.5rem;
  cursor: pointer;
}

/* Hero */

.hero {
  padding: 4rem 0 3rem;
}

.hero-inner {
  display: grid;
  grid-template-columns: minmax(0, 3fr) minmax(0, 2.2fr);
  gap: 2.5rem;
  align-items: center;
}

.hero-kicker {
  text-transform: uppercase;
  letter-spacing: 0.15em;
  color: var(--muted);
  font-size: 0.8rem;
  margin-bottom: 0.5rem;
}

.hero-title {
  font-size: clamp(2.5rem, 4vw, 3rem);
  margin: 0;
}

.hero-subtitle {
  margin: 0.3rem 0 1.2rem;
  font-size: 1.2rem;
  color: var(--accent);
  font-weight: 600;
}

.hero-description {
  margin: 0 0 1.7rem;
  color: var(--muted);
  max-width: 36rem;
}

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

/* Buttons */

.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  padding: 0.65rem 1.25rem;
  border-radius: 999px;
  font-size: 0.95rem;
  font-weight: 500;
  text-decoration: none;
  border: 1px solid transparent;
  cursor: pointer;
  transition: transform 0.1s ease, box-shadow 0.1s ease, background-color 0.1s ease, border-color 0.1s ease;
}

.btn-primary {
  background-color: var(--accent);
  color: #ffffff;
  box-shadow: 0 12px 24px rgba(37, 99, 235, 0.3);
}

.btn-primary:hover {
  transform: translateY(-1px);
  box-shadow: 0 18px 32px rgba(37, 99, 235, 0.35);
}

.btn-ghost {
  background-color: rgba(255, 255, 255, 0.8);
  color: var(--text);
  border-color: var(--border-subtle);
}

.btn-ghost:hover {
  background-color: #ffffff;
}

/* Hero card */

.hero-card {
  background: rgba(255, 255, 255, 0.9);
  border-radius: var(--radius-lg);
  box-shadow: var(--shadow-soft);
  border: 1px solid rgba(209, 213, 219, 0.7);
  overflow: hidden;
}

.hero-card-header {
  display: flex;
  gap: 0.3rem;
  padding: 0.55rem 0.8rem;
  border-bottom: 1px solid rgba(229, 231, 235, 0.9);
  background: linear-gradient(to right, #e5edff, #f9fafb);
}

.hero-card-header .dot {
  width: 9px;
  height: 9px;
  border-radius: 999px;
  background-color: #e5e7eb;
}

.hero-card-header .dot:nth-child(1) {
  background-color: #f97373;
}

.hero-card-header .dot:nth-child(2) {
  background-color: #facc15;
}

.hero-card-header .dot:nth-child(3) {
  background-color: #22c55e;
}

.hero-card-body {
  padding: 1.1rem 1.2rem 1.25rem;
}

.hero-card-label {
  text-transform: uppercase;
  font-size: 0.7rem;
  letter-spacing: 0.14em;
  color: var(--muted);
  margin: 0.4rem 0 0.1rem;
}

.hero-card-value {
  margin: 0.1rem 0 0.4rem;
  font-size: 0.95rem;
}

/* Section common */

.section-inner {
  display: flex;
  flex-direction: column;
  gap: 2rem;
}

.section-header h2 {
  margin: 0 0 0.3rem;
  font-size: 1.6rem;
}

.section-header p {
  margin: 0;
  color: var(--muted);
}

/* About */

.about-grid {
  display: grid;
  grid-template-columns: minmax(0, 3fr) minmax(0, 2fr);
  gap: 2rem;
}

.about-list-card {
  border-radius: var(--radius-md);
  border: 1px solid var(--border-subtle);
  padding: 1.25rem 1.4rem;
  background-color: #ffffff;
  box-shadow: 0 10px 24px rgba(15, 23, 42, 0.04);
}

.about-list-card h3 {
  margin-top: 0;
  margin-bottom: 0.75rem;
  font-size: 1.05rem;
}

.about-list-card ul {
  list-style: none;
  margin: 0;
  padding: 0;
  color: var(--muted);
}

.about-list-card li + li {
  margin-top: 0.3rem;
}

/* Cards */

.cards-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(210px, 1fr));
  gap: 1.4rem;
}

.card {
  background-color: #ffffff;
  border-radius: var(--radius-md);
  border: 1px solid rgba(226, 232, 240, 0.9);
  padding: 1.25rem 1.4rem;
  box-shadow: 0 12px 28px rgba(148, 163, 184, 0.2);
  position: relative;
  overflow: hidden;
}

.card::before {
  content: "";
  position: absolute;
  inset: 0;
  background: radial-gradient(circle at top left, rgba(37, 99, 235, 0.12), transparent 60%);
  opacity: 0;
  transition: opacity 0.2s ease;
  pointer-events: none;
}

.card:hover::before {
  opacity: 1;
}

.card h3 {
  margin-top: 0;
  margin-bottom: 0.4rem;
  font-size: 1.05rem;
}

.card p {
  margin: 0;
  font-size: 0.95rem;
  color: var(--muted);
}

/* Projects */

.cards-grid-projects .card {
  display: flex;
  flex-direction: column;
  gap: 0.6rem;
}

.card-tags {
  display: flex;
  flex-wrap: wrap;
  gap: 0.35rem;
  padding: 0;
  margin: 0.15rem 0 0;
  list-style: none;
}

.card-tags li {
  font-size: 0.75rem;
  padding: 0.2rem 0.5rem;
  border-radius: 999px;
  background-color: var(--accent-soft);
  color: var(--accent);
  border: 1px solid rgba(191, 219, 254, 0.9);
}

.card-links {
  margin-top: 0.3rem;
}

.card-links a {
  font-size: 0.9rem;
  color: var(--accent);
  text-decoration: none;
}

.card-links a[aria-disabled="true"] {
  color: var(--muted);
  cursor: default;
}

/* Contact */

.contact-inner {
  align-items: flex-start;
}

.contact-actions {
  display: flex;
  flex-wrap: wrap;
  gap: 0.75rem;
  margin-top: 1rem;
}

/* Footer */

.site-footer {
  border-top: 1px solid rgba(209, 213, 219, 0.8);
  padding: 1.5rem 0 2rem;
  background-color: rgba(248, 250, 252, 0.95);
}

.footer-inner {
  text-align: center;
}

.footer-inner p {
  margin: 0.2rem 0;
}

.footer-subtext {
  color: var(--muted);
  font-size: 0.85rem;
}

/* Responsive */

@media (max-width: 820px) {
  .hero-inner {
    grid-template-columns: minmax(0, 1fr);
  }

  .hero-card {
    order: -1;
  }

  .about-grid {
    grid-template-columns: minmax(0, 1fr);
  }

  .header-inner {
    height: auto;
    padding: 0.7rem 0;
  }

  .nav-toggle {
    display: inline-flex;
  }

  .nav-links {
    position: absolute;
    top: 56px;
    right: 1.5rem;
    flex-direction: column;
    background-color: #ffffff;
    border-radius: var(--radius-md);
    border: 1px solid var(--border-subtle);
    padding: 0.6rem 0.8rem;
    box-shadow: 0 12px 28px rgba(15, 23, 42, 0.18);
    display: none;
  }

  .nav-links.show {
    display: flex;
  }
}

@media (max-width: 480px) {
  .hero {
    padding-top: 3rem;
  }

  .cards-grid {
    grid-template-columns: minmax(0, 1fr);
  }
}