:root {
  --color-bg: #fafaf9;
  --color-surface: #ffffff;
  --color-text: #1a1a1a;
  --color-muted: #6b6b6b;
  --color-border: #e5e5e2;
  --color-accent: #2d5d4f;
  --color-accent-hover: #1f4439;
  --radius: 12px;
  --shadow-sm: 0 1px 2px rgba(0, 0, 0, 0.04);
  --shadow-md: 0 4px 16px rgba(0, 0, 0, 0.06);
  --max-width: 960px;
  --font-sans: -apple-system, BlinkMacSystemFont, "Helvetica Neue", "Hiragino Sans", "Yu Gothic UI", sans-serif;
}

* {
  box-sizing: border-box;
  margin: 0;
  padding: 0;
}

html {
  scroll-behavior: smooth;
}

body {
  font-family: var(--font-sans);
  background-color: var(--color-bg);
  color: var(--color-text);
  line-height: 1.7;
  font-size: 16px;
  -webkit-font-smoothing: antialiased;
}

a {
  color: var(--color-accent);
  text-decoration: none;
  transition: color 0.2s ease;
}

a:hover {
  color: var(--color-accent-hover);
}

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

/* ===== Header / Nav ===== */
.site-header {
  background-color: var(--color-surface);
  border-bottom: 1px solid var(--color-border);
  position: sticky;
  top: 0;
  z-index: 10;
  backdrop-filter: saturate(180%) blur(10px);
}

.nav-container {
  max-width: var(--max-width);
  margin: 0 auto;
  padding: 18px 24px;
  display: flex;
  justify-content: space-between;
  align-items: center;
  flex-wrap: wrap;
  gap: 16px;
}

.site-logo {
  font-size: 1.1rem;
  font-weight: 700;
  letter-spacing: 0.02em;
  color: var(--color-text);
}

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

.site-nav ul {
  list-style: none;
  display: flex;
  gap: 28px;
}

.site-nav a {
  color: var(--color-muted);
  font-size: 0.95rem;
  font-weight: 500;
  position: relative;
  padding: 4px 0;
}

.site-nav a:hover,
.site-nav a.is-active {
  color: var(--color-text);
}

.site-nav a.is-active::after {
  content: "";
  position: absolute;
  left: 0;
  bottom: -2px;
  width: 100%;
  height: 2px;
  background-color: var(--color-accent);
  border-radius: 2px;
}

/* ===== Layout ===== */
main {
  max-width: var(--max-width);
  margin: 0 auto;
  padding: 64px 24px;
}

section {
  margin-bottom: 72px;
}

section:last-child {
  margin-bottom: 0;
}

h1, h2, h3 {
  font-weight: 700;
  letter-spacing: -0.01em;
  line-height: 1.3;
}

h1 {
  font-size: clamp(2rem, 4vw, 2.75rem);
  margin-bottom: 16px;
}

h2 {
  font-size: 1.5rem;
  margin-bottom: 24px;
  padding-bottom: 12px;
  border-bottom: 1px solid var(--color-border);
}

h3 {
  font-size: 1.15rem;
  margin-bottom: 8px;
}

p {
  margin-bottom: 16px;
  color: var(--color-text);
}

p.muted {
  color: var(--color-muted);
}

/* ===== Hero ===== */
.hero {
  display: grid;
  grid-template-columns: 200px 1fr;
  gap: 40px;
  align-items: center;
  margin-bottom: 80px;
}

.hero-avatar {
  width: 200px;
  height: 200px;
  border-radius: 50%;
  object-fit: cover;
  box-shadow: var(--shadow-md);
}

.hero-text .role {
  display: inline-block;
  font-size: 0.85rem;
  color: var(--color-accent);
  background-color: rgba(45, 93, 79, 0.08);
  padding: 4px 12px;
  border-radius: 999px;
  margin-bottom: 16px;
  font-weight: 500;
}

.hero-text .tagline {
  font-size: 1.05rem;
  color: var(--color-muted);
  margin-bottom: 24px;
}

/* ===== Buttons ===== */
.btn {
  display: inline-block;
  padding: 12px 24px;
  background-color: var(--color-accent);
  color: #fff;
  border-radius: var(--radius);
  font-weight: 500;
  font-size: 0.95rem;
  transition: background-color 0.2s ease, transform 0.1s ease;
}

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

.btn:active {
  transform: translateY(1px);
}

.btn.btn-outline {
  background-color: transparent;
  color: var(--color-accent);
  border: 1px solid var(--color-accent);
}

.btn.btn-outline:hover {
  background-color: var(--color-accent);
  color: #fff;
}

.btn-group {
  display: flex;
  gap: 12px;
  flex-wrap: wrap;
}

/* ===== Cards / Grid ===== */
.card-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(280px, 1fr));
  gap: 24px;
}

.card {
  background-color: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: var(--radius);
  overflow: hidden;
  transition: transform 0.2s ease, box-shadow 0.2s ease;
}

.card:hover {
  transform: translateY(-4px);
  box-shadow: var(--shadow-md);
}

.card-image {
  aspect-ratio: 16 / 10;
  width: 100%;
  object-fit: cover;
  background-color: #eee;
}

.card-body {
  padding: 20px 22px;
}

.card-body p {
  color: var(--color-muted);
  font-size: 0.95rem;
  margin-bottom: 12px;
}

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

.tag {
  font-size: 0.75rem;
  color: var(--color-muted);
  background-color: var(--color-bg);
  padding: 2px 10px;
  border-radius: 999px;
  border: 1px solid var(--color-border);
}

/* ===== Skill list ===== */
.skill-list {
  list-style: none;
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(180px, 1fr));
  gap: 12px;
}

.skill-list li {
  background-color: var(--color-surface);
  padding: 12px 16px;
  border-radius: var(--radius);
  border: 1px solid var(--color-border);
  font-size: 0.95rem;
}

/* ===== Contact ===== */
.contact-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(240px, 1fr));
  gap: 20px;
  margin-bottom: 40px;
}

.contact-card {
  background-color: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: var(--radius);
  padding: 24px;
  text-align: center;
  transition: border-color 0.2s ease, transform 0.2s ease;
}

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

.contact-card .label {
  font-size: 0.8rem;
  color: var(--color-muted);
  text-transform: uppercase;
  letter-spacing: 0.08em;
  margin-bottom: 8px;
}

.contact-card .value {
  font-size: 1.05rem;
  font-weight: 500;
  color: var(--color-text);
  word-break: break-all;
}

.contact-card a.value:hover {
  color: var(--color-accent);
}

/* ===== Form ===== */
.contact-form {
  background-color: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: var(--radius);
  padding: 32px;
  display: grid;
  gap: 18px;
}

.form-row {
  display: flex;
  flex-direction: column;
  gap: 6px;
}

.form-row label {
  font-size: 0.9rem;
  font-weight: 500;
  color: var(--color-text);
}

.form-row input,
.form-row textarea {
  font-family: inherit;
  font-size: 1rem;
  padding: 10px 14px;
  border: 1px solid var(--color-border);
  border-radius: 8px;
  background-color: var(--color-bg);
  color: var(--color-text);
  transition: border-color 0.15s ease, box-shadow 0.15s ease;
}

.form-row input:focus,
.form-row textarea:focus {
  outline: none;
  border-color: var(--color-accent);
  box-shadow: 0 0 0 3px rgba(45, 93, 79, 0.12);
}

.form-row textarea {
  min-height: 140px;
  resize: vertical;
}

/* ===== Footer ===== */
.site-footer {
  border-top: 1px solid var(--color-border);
  padding: 32px 24px;
  text-align: center;
  color: var(--color-muted);
  font-size: 0.875rem;
}

/* ===== Responsive ===== */
@media (max-width: 640px) {
  .hero {
    grid-template-columns: 1fr;
    text-align: center;
    gap: 24px;
  }

  .hero-avatar {
    margin: 0 auto;
    width: 160px;
    height: 160px;
  }

  .btn-group {
    justify-content: center;
  }

  .site-nav ul {
    gap: 18px;
  }

  main {
    padding: 40px 20px;
  }

  .contact-form {
    padding: 22px;
  }
}