:root {
  --surface: #ffffff;
  --surface-soft: #f8fafc;
  --text-main: #0f172a;
  --text-subtle: #475569;
  --brand: #0f766e;
  --brand-soft: #ccfbf1;
  --border: #dce3eb;
  --shadow: 0 8px 24px rgba(15, 23, 42, 0.08);
}

body {
  font-family: "Roboto", sans-serif;
  background: linear-gradient(180deg, #f0fdfa 0%, #f8fafc 34%, #ffffff 100%);
  color: var(--text-main);
}

header,
main,
footer {
  max-width: 1100px;
  margin: 0 auto;
}

header nav ul {
  display: flex;
  gap: 0.9rem;
  list-style: none;
  padding: 0.8rem 0;
  margin: 0;
  flex-wrap: wrap;
}

header nav a {
  display: inline-block;
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: 999px;
  padding: 0.45rem 0.9rem;
  text-decoration: none;
  font-weight: 500;
  color: var(--text-main);
}

.utility-main {
  padding: 1rem 0 2rem;
}

.utility-hero {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: 16px;
  box-shadow: var(--shadow);
  padding: 1.1rem 1.25rem;
}

.utility-hero h1 {
  margin-top: 0;
}

.instructions,
.explanation,
.preview,
.settings,
.panel,
.notice {
  background: var(--surface-soft);
  border: 1px solid var(--border);
  border-radius: 12px;
  padding: 0.9rem 1rem;
  margin: 0.8rem 0;
}

.container {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
  gap: 0.9rem;
}

textarea,
input[type="text"],
input[type="number"],
input[type="file"],
select {
  width: 100%;
  box-sizing: border-box;
  border: 1px solid var(--border);
  border-radius: 10px;
  padding: 0.6rem 0.7rem;
  background: #fff;
}

textarea {
  min-height: 220px;
}

button {
  background: var(--brand);
  color: #fff;
  border: none;
  border-radius: 10px;
  padding: 0.55rem 0.9rem;
  font-weight: 500;
  cursor: pointer;
}

button:hover {
  filter: brightness(0.95);
}

table {
  width: 100%;
  border-collapse: collapse;
  margin: 0.7rem 0;
}

th,
td {
  border: 1px solid var(--border);
  padding: 0.5rem;
  text-align: left;
}

.site-footer {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: 16px;
  box-shadow: var(--shadow);
  padding: 1rem 1.2rem 1.4rem;
  margin-bottom: 2rem;
}

.site-footer h1 {
  font-size: 1.35rem;
  margin: 0 0 0.45rem;
}

.site-footer h2 {
  font-size: 1.05rem;
  color: var(--text-subtle);
  margin: 0 0 0.8rem;
  line-height: 1.4;
}

.site-footer ul {
  padding-left: 1.1rem;
}

@media (max-width: 640px) {
  .utility-hero {
    padding: 0.9rem;
  }
}


.site-header {
  background: transparent;
  position: static;
}

.site-header nav {
  max-width: 1100px;
  margin: 0 auto;
  padding: 0 20px;
}

.site-header nav ul li a {
  color: var(--text-main);
}

.utility-main,
.page-content,
.site-footer {
  max-width: 1100px;
  margin: 0 auto;
  padding-left: 20px;
  padding-right: 20px;
}

.page-content {
  padding-top: 1rem;
  padding-bottom: 2.5rem;
}

.hero {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: 16px;
  box-shadow: var(--shadow);
  padding: 1.2rem 1.3rem;
  margin-bottom: 1.2rem;
}

.hero h1 {
  margin: 0 0 0.35rem;
  font-size: 1.65rem;
}

.hero p {
  margin: 0;
  color: var(--text-subtle);
}

.articles-section {
  margin: 1.4rem 0 1.7rem;
}

.articles-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(220px, 1fr));
  gap: 0.85rem;
}

.article-card {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: 12px;
  overflow: hidden;
  text-decoration: none;
  color: inherit;
  box-shadow: var(--shadow);
  transition: transform 0.15s ease;
}

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

.article-card img {
  display: block;
  width: 100%;
  height: 120px;
  object-fit: cover;
}

.article-card h4 {
  margin: 0;
  padding: 0.75rem;
  font-size: 0.96rem;
  line-height: 1.35;
}