:root {
  --bg: #ffffff;
  --text: #111827;
  --muted: #6b7280;
  --primary: #2563eb;
  --primary-dark: #1d4ed8;
  --accent: #f59e0b;
  --card: #ffffff;
  --border: #e5e7eb;
}
* {
  box-sizing: border-box;
}
html,
body {
  height: 100%;
}
body {
  margin: 0;
  background: var(--bg);
  color: var(--text);
  font-family: system-ui, -apple-system, Segoe UI, Roboto, Arial, "Noto Sans SC",
    sans-serif;
}
a {
  color: var(--primary);
  text-decoration: none;
}

.container {
  max-width: 1100px;
  margin: 0 auto;
  padding: 0 20px;
}
.site-header {
  position: sticky;
  top: 0;
  background: #ffffff;
  border-bottom: 1px solid var(--border);
  z-index: 10;
}
.header-inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: 64px;
}
.brand {
  font-weight: 700;
  letter-spacing: 0.5px;
}
.nav a {
  margin-left: 16px;
  padding: 8px 10px;
  border-radius: 8px;
}
.nav a.active {
  background: #f3f4f6;
  color: var(--text);
}

.hero {
  background: radial-gradient(
      1200px circle at 10% 0%,
      rgba(37, 99, 235, 0.12),
      transparent 60%
    ),
    radial-gradient(
      1000px circle at 90% -10%,
      rgba(245, 158, 11, 0.12),
      transparent 50%
    );
}
.hero-inner {
  padding: 64px 0;
  text-align: center;
}
.hero h1 {
  font-size: 36px;
  margin: 0 0 12px;
}
.hero p {
  color: var(--muted);
  margin: 0 0 20px;
}
.cta {
  display: inline-block;
  background: var(--primary-dark);
  color: #fff;
  padding: 10px 16px;
  border-radius: 10px;
}

.section {
  padding: 40px 0;
}
.section.alt {
  background: #f7f8fb;
}
.grid.two {
  display: grid;
  grid-template-columns: 1.2fr 1fr;
  gap: 28px;
}

.form {
  background: var(--card);
  padding: 20px;
  border: 1px solid var(--border);
  border-radius: 14px;
}
.form-row {
  display: flex;
  flex-direction: column;
  margin-bottom: 14px;
}
.form-row.inline {
  flex-direction: row;
  align-items: center;
  gap: 10px;
}
label {
  font-size: 14px;
  margin-bottom: 6px;
  color: var(--muted);
}
input,
select,
textarea {
  width: 100%;
  padding: 10px 12px;
  border: 1px solid var(--border);
  border-radius: 10px;
  background: #ffffff;
  color: var(--text);
}
input[type="checkbox"] {
  width: auto;
}
.btn {
  display: inline-block;
  padding: 10px 14px;
  border-radius: 10px;
  border: 0;
  cursor: pointer;
}
.btn.primary {
  background: var(--primary-dark);
  color: #fff;
}
.btn.primary:hover {
  background: var(--primary);
}
.form-message {
  min-height: 22px;
  margin: 6px 0 10px;
  padding: 8px 10px;
  background: #ffffff;
  border: 1px solid var(--border);
  border-radius: 8px;
  color: #374151;
}

/* CSS-only validation feedback */
.form .msg-error,
.form .msg-success {
  display: none;
}
.form:focus-within:has(:invalid) .msg-error {
  display: block;
  color: #b91c1c;
  border-color: #fecaca;
}
.form:focus-within:not(:has(:invalid)) .msg-success {
  display: block;
  color: #166534;
  border-color: #bbf7d0;
}
input:invalid,
select:invalid,
textarea:invalid {
  border-color: #fecaca;
}
input:valid,
select:valid,
textarea:valid {
  border-color: #bbf7d0;
}

.site-footer {
  border-top: 1px solid var(--border);
  background: #ffffff;
}
.footer-inner {
  height: 64px;
  display: flex;
  align-items: center;
}

.card-list {
  list-style: none;
  padding: 0;
  margin: 0;
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(260px, 1fr));
  gap: 18px;
}
.card-list li {
  background: var(--card);
  border: 1px solid var(--border);
  border-radius: 14px;
  padding: 14px;
}
.card-list li .nick {
  font-weight: 600;
}
.card-list li .fav {
  color: var(--muted);
  font-size: 14px;
}

.card-list li .row {
  display: flex;
  gap: 12px;
  align-items: flex-start;
}
.card-list li img.avatar {
  width: 48px;
  height: 48px;
  border-radius: 50%;
  object-fit: cover;
  border: 1px solid var(--border);
}

.gallery {
  list-style: none;
  padding: 0;
  margin: 0;
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(220px, 1fr));
  gap: 16px;
}
.gallery li {
  background: var(--card);
  border: 1px solid var(--border);
  border-radius: 14px;
  overflow: hidden;
}
.gallery img {
  width: 100%;
  display: block;
  object-fit: cover;
}

@media (max-width: 860px) {
  .grid.two {
    grid-template-columns: 1fr;
  }
  .hero h1 {
    font-size: 28px;
  }
}