:root {
  --ink: #102a43;
  --ink-soft: #334e68;
  --paper: #f3f6f4;
  --paper-2: #e4ebe6;
  --line: #c5d0c8;
  --accent: #0f766e;
  --accent-2: #b45309;
  --ok: #047857;
  --warn: #b45309;
  --bad: #b91c1c;
  --muted: #627d85;
  --radius: 2px;
  --font-display: "Fraunces", "Times New Roman", serif;
  --font-body: "Figtree", "Segoe UI", sans-serif;
}

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

html {
  scroll-behavior: smooth;
}

body {
  margin: 0;
  min-height: 100vh;
  color: var(--ink);
  font-family: var(--font-body);
  font-size: 1.05rem;
  line-height: 1.55;
  background:
    radial-gradient(1200px 600px at 10% -10%, #d7ebe6 0%, transparent 55%),
    radial-gradient(900px 500px at 100% 0%, #efe4d4 0%, transparent 50%),
    linear-gradient(180deg, var(--paper) 0%, var(--paper-2) 100%);
}

body::before {
  content: "";
  position: fixed;
  inset: 0;
  pointer-events: none;
  opacity: 0.35;
  background-image: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='160' height='160'%3E%3Cfilter id='n'%3E%3CfeTurbulence type='fractalNoise' baseFrequency='0.8' numOctaves='4' stitchTiles='stitch'/%3E%3C/filter%3E%3Crect width='160' height='160' filter='url(%23n)' opacity='0.45'/%3E%3C/svg%3E");
  mix-blend-mode: multiply;
  z-index: 0;
}

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

.wrap {
  position: relative;
  z-index: 1;
  width: min(920px, calc(100% - 2rem));
  margin: 0 auto;
}

.top {
  display: flex;
  align-items: baseline;
  justify-content: space-between;
  gap: 1rem;
  padding: 1.25rem 0 0.5rem;
}

.brand {
  font-family: var(--font-display);
  font-weight: 700;
  font-size: 1.35rem;
  letter-spacing: -0.02em;
  color: var(--ink);
  text-decoration: none;
}

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

.nav {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 0.85rem 1.1rem;
  font-size: 0.92rem;
}

.lang {
  margin-left: 0.25rem;
  padding-left: 0.85rem;
  border-left: 1px solid var(--line);
  font-weight: 600;
  color: var(--ink-soft);
  text-decoration: none;
}

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

.nav a {
  color: var(--ink-soft);
  text-decoration: none;
  border-bottom: 1px solid transparent;
}

.nav a:hover,
.nav a[aria-current="page"] {
  color: var(--ink);
  border-bottom-color: var(--accent);
}

.hero {
  padding: 2.5rem 0 1.5rem;
  animation: rise 0.7s ease-out both;
}

@keyframes rise {
  from {
    opacity: 0;
    transform: translateY(12px);
  }
  to {
    opacity: 1;
    transform: none;
  }
}

.hero h1 {
  margin: 0 0 0.75rem;
  font-family: var(--font-display);
  font-weight: 650;
  font-size: clamp(2rem, 5vw, 3.1rem);
  line-height: 1.12;
  letter-spacing: -0.03em;
  max-width: 14ch;
}

.hero .lead {
  margin: 0 0 1.75rem;
  max-width: 38rem;
  color: var(--ink-soft);
  font-size: 1.08rem;
}

.checker {
  display: grid;
  gap: 0.75rem;
  animation: rise 0.8s 0.08s ease-out both;
}

.checker-row {
  display: grid;
  grid-template-columns: 1fr auto;
  gap: 0.6rem;
}

@media (max-width: 560px) {
  .checker-row {
    grid-template-columns: 1fr;
  }
}

.checker input[type="text"] {
  width: 100%;
  padding: 0.95rem 1rem;
  border: 1.5px solid var(--ink);
  border-radius: var(--radius);
  background: rgba(255, 255, 255, 0.72);
  font: inherit;
  color: var(--ink);
  outline: none;
  transition: box-shadow 0.2s ease, border-color 0.2s ease;
}

.checker input[type="text"]:focus {
  box-shadow: 0 0 0 3px rgba(15, 118, 110, 0.25);
  border-color: var(--accent);
}

.checker button {
  padding: 0.95rem 1.35rem;
  border: 1.5px solid var(--ink);
  border-radius: var(--radius);
  background: var(--ink);
  color: #f7faf8;
  font: inherit;
  font-weight: 600;
  cursor: pointer;
  transition: transform 0.15s ease, background 0.15s ease;
}

.checker button:hover {
  background: var(--accent);
  border-color: var(--accent);
}

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

.checker button:disabled {
  opacity: 0.55;
  cursor: wait;
}

.hint {
  margin: 0;
  font-size: 0.88rem;
  color: var(--muted);
}

.results {
  margin: 2rem 0 3rem;
  min-height: 2rem;
}

.results[hidden] {
  display: none;
}

.score-bar {
  display: flex;
  align-items: flex-end;
  justify-content: space-between;
  gap: 1rem;
  margin-bottom: 1.25rem;
  padding-bottom: 1rem;
  border-bottom: 1px solid var(--line);
  animation: rise 0.45s ease-out both;
}

.score-bar strong {
  font-family: var(--font-display);
  font-size: clamp(2.4rem, 6vw, 3.4rem);
  line-height: 1;
  letter-spacing: -0.04em;
}

.score-bar .meta {
  text-align: right;
  color: var(--ink-soft);
  font-size: 0.95rem;
}

.check-list {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  gap: 0.65rem;
}

.check-item {
  display: grid;
  grid-template-columns: auto 1fr;
  gap: 0.75rem 1rem;
  padding: 0.9rem 0;
  border-bottom: 1px solid var(--line);
  animation: rise 0.5s ease-out both;
}

.check-item .badge {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  min-width: 4.6rem;
  height: 1.7rem;
  padding: 0 0.55rem;
  border-radius: 999px;
  font-size: 0.75rem;
  font-weight: 700;
  letter-spacing: 0.04em;
  text-transform: uppercase;
  align-self: start;
  margin-top: 0.15rem;
}

.badge.ok {
  background: #d1fae5;
  color: var(--ok);
}

.badge.warn {
  background: #ffedd5;
  color: var(--warn);
}

.badge.bad {
  background: #fee2e2;
  color: var(--bad);
}

.badge.info {
  background: #e0f2fe;
  color: #0369a1;
}

.check-item h3 {
  margin: 0 0 0.25rem;
  font-size: 1.05rem;
}

.check-item p {
  margin: 0;
  color: var(--ink-soft);
  font-size: 0.95rem;
}

.check-item code {
  font-size: 0.82rem;
  word-break: break-all;
  background: rgba(255, 255, 255, 0.55);
  padding: 0.1rem 0.35rem;
}

.cta {
  margin: 2.5rem 0 1rem;
  padding: 1.5rem 0 0;
  border-top: 1px solid var(--line);
}

.cta h2 {
  margin: 0 0 0.5rem;
  font-family: var(--font-display);
  font-size: 1.55rem;
  letter-spacing: -0.02em;
}

.cta p {
  margin: 0 0 1rem;
  color: var(--ink-soft);
  max-width: 36rem;
}

.cta a.button {
  display: inline-block;
  padding: 0.75rem 1.1rem;
  border: 1.5px solid var(--ink);
  background: transparent;
  color: var(--ink);
  text-decoration: none;
  font-weight: 600;
  transition: background 0.15s ease, color 0.15s ease;
}

.cta a.button:hover {
  background: var(--ink);
  color: #f7faf8;
}

.seo-block {
  margin: 3rem 0 2rem;
  padding-top: 1.5rem;
  border-top: 1px solid var(--line);
}

.seo-block h2 {
  font-family: var(--font-display);
  font-size: 1.45rem;
  margin: 0 0 0.75rem;
}

.seo-block p,
.seo-block li {
  color: var(--ink-soft);
}

.article {
  padding: 1.5rem 0 2rem;
  animation: rise 0.55s ease-out both;
}

.article h1 {
  margin: 0 0 0.75rem;
  font-family: var(--font-display);
  font-weight: 650;
  font-size: clamp(1.75rem, 4.2vw, 2.45rem);
  line-height: 1.15;
  letter-spacing: -0.03em;
  max-width: 18ch;
}

.article .meta {
  margin: 0 0 1.5rem;
  font-size: 0.9rem;
  color: var(--muted);
}

.article h2 {
  margin: 1.75rem 0 0.65rem;
  font-family: var(--font-display);
  font-size: 1.35rem;
  letter-spacing: -0.02em;
}

.article p,
.article li {
  color: var(--ink-soft);
}

.article ul,
.article ol {
  padding-left: 1.2rem;
}

.article li {
  margin: 0.35rem 0;
}

.article .box {
  margin: 1.25rem 0;
  padding: 1rem 1.1rem;
  border: 1px solid var(--line);
  background: rgba(255, 255, 255, 0.55);
}

.article .box strong {
  display: block;
  margin-bottom: 0.35rem;
  color: var(--ink);
}

.guide-list {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  gap: 0.85rem;
}

.guide-list a {
  display: block;
  padding: 0.85rem 0;
  border-bottom: 1px solid var(--line);
  text-decoration: none;
  color: var(--ink);
  font-weight: 600;
}

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

.guide-list span {
  display: block;
  margin-top: 0.25rem;
  font-weight: 400;
  font-size: 0.92rem;
  color: var(--ink-soft);
}

.footer {
  margin: 3rem 0 2rem;
  padding-top: 1rem;
  border-top: 1px solid var(--line);
  font-size: 0.88rem;
  color: var(--muted);
  display: flex;
  flex-wrap: wrap;
  gap: 0.75rem 1.25rem;
}

.footer a {
  color: var(--muted);
}

.error-box {
  padding: 1rem;
  border: 1px solid #fecaca;
  background: #fef2f2;
  color: var(--bad);
}