* { margin: 0; padding: 0; box-sizing: border-box; }

:root {
  --bg: #0f1115;
  --surface: #181b22;
  --surface-hover: #1f232c;
  --border: #2a2f3a;
  --text: #e8eaed;
  --text-muted: #9aa0a6;
  --accent: #6c8cff;
  --accent-hover: #8aa3ff;
  --accent-soft: rgba(108, 140, 255, 0.12);
}

body {
  font-family: "Inter", -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, sans-serif;
  background: var(--bg);
  color: var(--text);
  line-height: 1.7;
  font-size: 18px;
  -webkit-font-smoothing: antialiased;
}

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

header {
  border-bottom: 1px solid var(--border);
  padding: 20px 0;
  background: rgba(15, 17, 21, 0.85);
  backdrop-filter: blur(12px);
  position: sticky;
  top: 0;
  z-index: 100;
}

.container {
  max-width: 1100px;
  margin: 0 auto;
  padding: 0 28px;
}

.header-inner {
  display: flex;
  justify-content: space-between;
  align-items: center;
}

.logo {
  font-size: 20px;
  font-weight: 700;
  letter-spacing: -0.3px;
  display: flex;
  align-items: center;
  gap: 10px;
}

.logo-dot {
  width: 10px;
  height: 10px;
  border-radius: 50%;
  background: var(--accent);
  box-shadow: 0 0 12px var(--accent);
}

.lang-switch {
  display: flex;
  gap: 4px;
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: 8px;
  padding: 4px;
}

.lang-switch a {
  color: var(--text-muted);
  font-size: 15px;
  font-weight: 600;
  padding: 6px 12px;
  border-radius: 6px;
  transition: all 0.15s;
}

.lang-switch a.active {
  background: var(--accent);
  color: #fff;
}

.lang-switch a:hover:not(.active) {
  color: var(--text);
  background: var(--surface-hover);
}

main { padding: 56px 0; }

.hero { text-align: center; margin-bottom: 48px; }

h1 {
  font-size: 44px;
  font-weight: 800;
  margin-bottom: 16px;
  letter-spacing: -1px;
  background: linear-gradient(135deg, #fff 0%, #9aa0a6 100%);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}

.subtitle {
  color: var(--text-muted);
  font-size: 19px;
  max-width: 600px;
  margin: 0 auto;
}

.filters {
  display: flex;
  gap: 12px;
  margin-bottom: 36px;
  flex-wrap: wrap;
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: 14px;
  padding: 16px;
}

.filters select,
.filters input {
  padding: 11px 16px;
  border: 1px solid var(--border);
  border-radius: 10px;
  font-size: 16px;
  background: var(--bg);
  color: var(--text);
  font-family: inherit;
  transition: border-color 0.15s;
}

.filters input { flex: 1; min-width: 200px; }

.filters select:focus,
.filters input:focus {
  outline: none;
  border-color: var(--accent);
}

.filters select option {
  background: var(--surface);
  color: var(--text);
}

.letter-card {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: 16px;
  padding: 36px;
  margin-bottom: 24px;
  transition: all 0.2s;
  position: relative;
  overflow: hidden;
  display: block;
}

.letter-card::before {
  content: "";
  position: absolute;
  top: 0; left: 0; right: 0;
  height: 3px;
  background: linear-gradient(90deg, var(--accent), transparent);
  opacity: 0;
  transition: opacity 0.2s;
}

.letter-card:hover {
  border-color: var(--accent);
  background: var(--surface-hover);
  transform: translateY(-2px);
  box-shadow: 0 12px 32px rgba(0, 0, 0, 0.4);
}

.letter-card:hover::before { opacity: 1; }

.letter-meta {
  display: flex;
  gap: 8px;
  margin-bottom: 20px;
  flex-wrap: wrap;
}

.tag {
  font-size: 14px;
  padding: 5px 12px;
  background: var(--accent-soft);
  border: 1px solid rgba(108, 140, 255, 0.2);
  border-radius: 20px;
  color: var(--accent-hover);
  font-weight: 600;
  letter-spacing: 0.2px;
}

.letter-title {
  font-size: 30px;
  font-weight: 700;
  margin-bottom: 8px;
  letter-spacing: -0.5px;
}

.letter-author {
  color: var(--text-muted);
  font-size: 16px;
  margin-bottom: 28px;
}

.letter-body {
  font-size: 18px;
  line-height: 1.85;
  color: #c8ccd2;
  white-space: pre-line;
  margin-bottom: 28px;
  padding-left: 20px;
  border-left: 2px solid var(--border);
}

.letter-actions {
  display: flex;
  gap: 12px;
}

.btn {
  padding: 11px 22px;
  border: none;
  background: var(--accent);
  color: #fff;
  border-radius: 10px;
  font-size: 16px;
  font-weight: 600;
  cursor: pointer;
  font-family: inherit;
  transition: all 0.15s;
  display: inline-flex;
  align-items: center;
  gap: 8px;
}

.btn:hover {
  background: var(--accent-hover);
  transform: translateY(-1px);
}

.btn-secondary {
  background: transparent;
  color: var(--text);
  border: 1px solid var(--border);
}

.btn-secondary:hover {
  background: var(--surface-hover);
  border-color: var(--accent);
}

footer {
  border-top: 1px solid var(--border);
  padding: 36px 0;
  margin-top: 56px;
  color: var(--text-muted);
  font-size: 16px;
}

footer .container {
  display: flex;
  justify-content: space-between;
  align-items: center;
  flex-wrap: wrap;
  gap: 16px;
}

footer a {
  color: var(--text-muted);
  transition: color 0.15s;
}

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

.footer-links { display: flex; gap: 20px; flex-wrap: wrap; }

.page-nav {
  display: flex;
  gap: 12px;
  margin-bottom: 32px;
  flex-wrap: wrap;
}

.page-nav a {
  padding: 8px 16px;
  border: 1px solid var(--border);
  border-radius: 8px;
  font-size: 16px;
  color: var(--text-muted);
  transition: all 0.15s;
}

.page-nav a.active {
  background: var(--accent);
  color: #fff;
  border-color: var(--accent);
}

.page-nav a:hover:not(.active) {
  border-color: var(--accent);
  color: var(--text);
}

.legal-page {
  max-width: 800px;
  margin: 0 auto;
}

.legal-page h1 {
  font-size: 36px;
  margin-bottom: 24px;
  text-align: left;
  background: none;
  -webkit-text-fill-color: var(--text);
  color: var(--text);
}

.legal-page h2 {
  font-size: 24px;
  margin: 32px 0 16px;
}

.legal-page p {
  margin-bottom: 16px;
  color: #c8ccd2;
}

@media (max-width: 600px) {
  h1 { font-size: 32px; }
  .letter-title { font-size: 24px; }
  .letter-card { padding: 24px; }
  .filters { flex-direction: column; }
  .filters select, .filters input { width: 100%; }
}