:root {
  --navy: #0f172a;
  --navy-soft: #1e293b;
  --border: #dbe3ef;
  --surface: #ffffff;
  --surface-alt: #f8fafc;
  --text: #0f172a;
  --muted: #64748b;
  --accent: #0ea5e9;
  --danger: #dc2626;
  --shadow: 0 18px 40px rgba(15, 23, 42, 0.08);
}

* {
  box-sizing: border-box;
}

body {
  margin: 0;
  font-family: "Segoe UI", Tahoma, Geneva, Verdana, sans-serif;
  background: linear-gradient(180deg, #eff6ff 0%, #f8fafc 240px, #f8fafc 100%);
  color: var(--text);
}

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

.site-header {
  background: var(--navy);
  color: #fff;
  border-bottom: 1px solid rgba(255, 255, 255, 0.08);
}

.nav-wrap,
.page-wrap {
  width: min(1100px, calc(100% - 32px));
  margin: 0 auto;
}

.nav-wrap {
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding: 18px 0;
}

.brand {
  font-size: 1.1rem;
  font-weight: 700;
  letter-spacing: 0.04em;
}

.nav-links {
  display: flex;
  gap: 12px;
  align-items: center;
}

.nav-links a,
.nav-links button,
.button {
  border: 1px solid transparent;
  border-radius: 999px;
  padding: 10px 16px;
  background: transparent;
  color: inherit;
  cursor: pointer;
  font: inherit;
}

.nav-links a:hover,
.nav-links button:hover,
.button:hover {
  border-color: rgba(255, 255, 255, 0.2);
}

.page-wrap {
  padding: 28px 0 48px;
}

.flash {
  display: none;
  margin-bottom: 16px;
  padding: 14px 16px;
  border-radius: 14px;
  border: 1px solid var(--border);
  background: #fff;
  box-shadow: var(--shadow);
}

.flash.show {
  display: block;
}

.layout-grid {
  display: grid;
  gap: 20px;
}

.card {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: 20px;
  box-shadow: var(--shadow);
  padding: 22px;
}

.hero {
  display: flex;
  justify-content: space-between;
  gap: 24px;
  align-items: center;
}

.hero h1,
.post-title {
  margin: 0 0 10px;
}

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

.tabs {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
  margin: 18px 0 0;
}

.tab {
  padding: 9px 14px;
  border-radius: 999px;
  border: 1px solid var(--border);
  background: var(--surface);
}

.tab.active {
  background: var(--navy);
  color: #fff;
  border-color: var(--navy);
}

.post-list,
.comment-list {
  display: grid;
  gap: 16px;
}

.post-item {
  border: 1px solid var(--border);
  border-radius: 18px;
  padding: 18px;
  background: var(--surface);
}

.meta-row,
.post-footer,
.comment-header,
.pagination {
  display: flex;
  justify-content: space-between;
  align-items: center;
  gap: 12px;
}

.badge {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 7px 12px;
  border-radius: 999px;
  background: var(--surface-alt);
  border: 1px solid var(--border);
  color: var(--navy-soft);
  font-size: 0.92rem;
}

.pill {
  font-size: 0.82rem;
  text-transform: capitalize;
}

form {
  display: grid;
  gap: 14px;
}

label {
  display: grid;
  gap: 8px;
  font-weight: 600;
}

input,
select,
textarea {
  width: 100%;
  border: 1px solid var(--border);
  border-radius: 14px;
  padding: 12px 14px;
  font: inherit;
  background: #fff;
}

textarea {
  min-height: 180px;
  resize: vertical;
}

.button.primary {
  background: var(--navy);
  color: #fff;
}

.button.secondary {
  border-color: var(--border);
  background: var(--surface);
}

.button.danger {
  background: #fff1f2;
  color: var(--danger);
  border-color: #fecdd3;
}

.button-row {
  display: flex;
  gap: 12px;
  flex-wrap: wrap;
}

.hidden {
  display: none !important;
}

.comment-item {
  border-top: 1px solid var(--border);
  padding-top: 16px;
}

.comment-item:first-child {
  border-top: none;
  padding-top: 0;
}

.stats {
  display: flex;
  gap: 14px;
  flex-wrap: wrap;
  margin-top: 12px;
}

@media (max-width: 720px) {
  .nav-wrap,
  .hero,
  .meta-row,
  .post-footer,
  .comment-header,
  .pagination {
    flex-direction: column;
    align-items: flex-start;
  }
}