:root {
  --bg: #080b10;
  --surface: #101720;
  --surface-soft: #151f2a;
  --text: #edf2f7;
  --muted: #9aa8b8;
  --line: #233142;
  --accent: #2dd4bf;
  --accent-strong: #14b8a6;
  --accent-warm: #f59e0b;
  --max-width: 1120px;
  --header-height: 76px;
}

* {
  box-sizing: border-box;
}

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

body {
  margin: 0;
  min-height: 100vh;
  color: var(--text);
  background:
    radial-gradient(circle at top left, rgba(45, 212, 191, 0.14), transparent 34rem),
    linear-gradient(135deg, #080b10 0%, #0c1118 45%, #111827 100%);
  font-family: Arial, Helvetica, sans-serif;
  line-height: 1.6;
}

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

.site-header {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  z-index: 20;
  background: rgba(8, 11, 16, 0.9);
  border-bottom: 1px solid rgba(255, 255, 255, 0.08);
  backdrop-filter: blur(16px);
}

.nav {
  width: min(100% - 32px, var(--max-width));
  height: var(--header-height);
  margin: 0 auto;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 24px;
}

.brand {
  display: inline-flex;
  align-items: center;
  gap: 12px;
  font-weight: 700;
  letter-spacing: 0;
  white-space: nowrap;
}

.brand-mark {
  display: grid;
  place-items: center;
  width: 38px;
  height: 38px;
  border-radius: 8px;
  color: #06110f;
  background: linear-gradient(135deg, var(--accent), var(--accent-warm));
  font-weight: 800;
}

.nav-links {
  display: flex;
  align-items: center;
  gap: 6px;
  padding: 0;
  margin: 0;
  list-style: none;
}

.nav-links a {
  display: block;
  padding: 10px 12px;
  border-radius: 8px;
  color: var(--muted);
  font-size: 0.95rem;
  transition: color 160ms ease, background 160ms ease;
}

.nav-links a:hover,
.nav-links a:focus-visible,
.nav-links a.active {
  color: var(--text);
  background: rgba(255, 255, 255, 0.07);
}

.nav-toggle {
  display: none;
}

.nav-button {
  display: none;
  width: 42px;
  height: 42px;
  place-items: center;
  border: 1px solid var(--line);
  border-radius: 8px;
  cursor: pointer;
}

.nav-button span {
  display: block;
  width: 20px;
  height: 2px;
  margin: 4px 0;
  background: var(--text);
}

main {
  padding-top: var(--header-height);
}

.hero,
.page-hero {
  width: min(100% - 32px, var(--max-width));
  margin: 0 auto;
}

.hero {
  min-height: calc(100vh - var(--header-height));
  display: grid;
  align-items: center;
  padding: 72px 0 88px;
}

.page-hero {
  padding: 96px 0 54px;
}

.hero-content {
  max-width: 780px;
}

.eyebrow {
  margin: 0 0 12px;
  color: var(--accent);
  font-size: 0.78rem;
  font-weight: 700;
  letter-spacing: 0.12em;
  text-transform: uppercase;
}

h1,
h2,
h3,
p {
  margin-top: 0;
}

h1 {
  max-width: 880px;
  margin-bottom: 22px;
  font-size: clamp(2.1rem, 5.6vw, 4.4rem);
  line-height: 0.98;
  letter-spacing: 0;
}

h2 {
  margin-bottom: 16px;
  font-size: clamp(1.6rem, 3.4vw, 2.55rem);
  line-height: 1.1;
  letter-spacing: 0;
}

h3 {
  margin-bottom: 10px;
  font-size: 1.15rem;
}

.hero-text {
  max-width: 650px;
  color: var(--muted);
  font-size: 1.12rem;
}

.hero-actions {
  display: flex;
  flex-wrap: wrap;
  gap: 14px;
  margin-top: 34px;
}

.button {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  min-height: 46px;
  padding: 12px 18px;
  border-radius: 8px;
  font-weight: 700;
  transition: transform 160ms ease, border-color 160ms ease, background 160ms ease;
}

.button:hover {
  transform: translateY(-2px);
}

.button-primary {
  color: #06110f;
  background: var(--accent);
}

.button-secondary {
  color: var(--text);
  border: 1px solid var(--line);
  background: rgba(255, 255, 255, 0.04);
}

.text-link {
  display: inline-flex;
  margin-top: 12px;
  color: var(--accent);
  font-weight: 700;
}

.section {
  width: min(100% - 32px, var(--max-width));
  margin: 0 auto;
  padding: 88px 0;
}

.section-compact {
  padding-top: 34px;
}

.page-section {
  margin-top: 72px;
}

.section-muted {
  width: 100%;
  max-width: none;
  padding-left: max(16px, calc((100% - var(--max-width)) / 2));
  padding-right: max(16px, calc((100% - var(--max-width)) / 2));
  background: rgba(16, 23, 32, 0.72);
  border-top: 1px solid rgba(255, 255, 255, 0.06);
  border-bottom: 1px solid rgba(255, 255, 255, 0.06);
}

.section-heading {
  max-width: 720px;
  margin-bottom: 34px;
}

.section-heading p:not(.eyebrow),
.card p,
.project-item p,
.split-content,
.about p,
.imprint {
  color: var(--muted);
}

.feature-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 18px;
}

.card {
  min-height: 210px;
  padding: 26px;
  border: 1px solid var(--line);
  border-radius: 8px;
  background: rgba(16, 23, 32, 0.86);
}

.project-list {
  display: grid;
  gap: 14px;
}

.project-item {
  display: grid;
  grid-template-columns: 64px 1fr;
  gap: 20px;
  align-items: start;
  padding: 24px 0;
  border-top: 1px solid var(--line);
}

.project-item:last-child {
  border-bottom: 1px solid var(--line);
}

.project-item span {
  color: var(--accent-warm);
  font-weight: 800;
}

.project-diary {
  display: grid;
  gap: 28px;
}

.diary-entry {
  padding: 26px;
  border: 1px solid var(--line);
  border-radius: 8px;
  background: rgba(16, 23, 32, 0.86);
}

.diary-entry h2 {
  font-size: clamp(1.45rem, 3vw, 2.2rem);
}

.diary-entry a {
  display: block;
  margin-bottom: 18px;
}

.diary-entry img {
  display: block;
  width: 100%;
  height: auto;
  border: 1px solid var(--line);
  border-radius: 8px;
}

.diary-entry figure {
  margin: 24px 0 0;
}

.diary-entry figcaption {
  margin-top: 10px;
  color: var(--muted);
  font-size: 0.95rem;
}

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

.split {
  display: grid;
  grid-template-columns: minmax(0, 0.85fr) minmax(0, 1fr);
  gap: 56px;
  align-items: start;
}

.check-list {
  display: grid;
  gap: 12px;
  padding: 0;
  margin: 24px 0 0;
  list-style: none;
}

.check-list li {
  padding-left: 28px;
  position: relative;
}

.check-list li::before {
  content: "";
  position: absolute;
  left: 0;
  top: 0.7em;
  width: 10px;
  height: 10px;
  border-radius: 50%;
  background: var(--accent);
}

.about {
  display: grid;
  grid-template-columns: 120px minmax(0, 760px);
  gap: 32px;
  align-items: center;
}

.avatar {
  display: grid;
  place-items: center;
  width: 120px;
  height: 120px;
  border-radius: 8px;
  color: #06110f;
  background: linear-gradient(135deg, var(--accent), var(--accent-warm));
  font-size: 2rem;
  font-weight: 900;
}

.imprint {
  max-width: 760px;
  padding: 24px;
  border: 1px solid var(--line);
  border-radius: 8px;
  background: var(--surface);
}

.imprint h2 {
  font-size: clamp(1.45rem, 3vw, 2.2rem);
}

.imprint h2:not(:first-child) {
  margin-top: 34px;
}

.imprint a {
  color: var(--accent);
}

.site-footer {
  width: min(100% - 32px, var(--max-width));
  margin: 0 auto;
  padding: 30px 0 42px;
  color: var(--muted);
  border-top: 1px solid var(--line);
}

@media (max-width: 820px) {
  .nav-button {
    display: grid;
  }

  .nav-links {
    position: absolute;
    top: var(--header-height);
    left: 0;
    right: 0;
    display: none;
    flex-direction: column;
    align-items: stretch;
    width: 100%;
    padding: 10px 16px 18px;
    background: rgba(8, 11, 16, 0.98);
    border-bottom: 1px solid rgba(255, 255, 255, 0.08);
  }

  .nav-links a {
    padding: 13px 12px;
  }

  .nav-toggle:checked ~ .nav-links {
    display: flex;
  }

  .hero {
    min-height: auto;
    padding: 72px 0;
  }

  .feature-grid,
  .split,
  .about {
    grid-template-columns: 1fr;
  }

  .about {
    align-items: start;
  }
}

@media (max-width: 560px) {
  :root {
    --header-height: 68px;
  }

  .nav {
    width: min(100% - 24px, var(--max-width));
  }

  .brand {
    font-size: 0.95rem;
  }

  .brand-mark {
    width: 34px;
    height: 34px;
  }

  .hero,
  .page-hero,
  .section,
  .site-footer {
    width: min(100% - 24px, var(--max-width));
  }

  .page-hero {
    padding-top: 72px;
  }

  .section,
  .section-muted {
    padding-top: 64px;
    padding-bottom: 64px;
  }

  .section-compact {
    padding-top: 24px;
  }

  .hero-actions {
    align-items: stretch;
    flex-direction: column;
  }

  .button {
    width: 100%;
  }

  .project-item {
    grid-template-columns: 1fr;
    gap: 8px;
  }

  .avatar {
    width: 88px;
    height: 88px;
    font-size: 1.45rem;
  }
}