:root {
  --ink-900: #12181f;
  --ink-800: #1b232d;
  --ink-700: #29323d;
  --paper-100: #f4f6f8;
  --paper-000: #ffffff;
  --border: #dbe1e7;
  --accent: #3d7fb8;
  --accent-dark: #2c5f8c;
  --danger: #b8433d;
  --danger-dark: #96332e;
  --ok: #3f8f5f;
  --text-muted: #6b7684;
  --radius: 6px;
  --font-ui: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Helvetica, Arial, sans-serif;
  --font-mono: ui-monospace, SFMono-Regular, "SF Mono", Menlo, Consolas, monospace;
}

* {
  box-sizing: border-box;
}

html, body {
  height: 100%;
}

body {
  margin: 0;
  font-family: var(--font-ui);
  background: var(--paper-100);
  color: var(--ink-900);
  display: flex;
  flex-direction: column;
  min-height: 100vh;
  font-size: 15px;
  line-height: 1.5;
}

/* ---------- Header ---------- */

.site-header {
  background: var(--ink-900);
  color: var(--paper-100);
  border-bottom: 1px solid var(--ink-700);
}

.site-header__inner {
  max-width: 1080px;
  margin: 0 auto;
  padding: 0 24px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: 56px;
}

.site-header__brand {
  display: flex;
  align-items: baseline;
  gap: 8px;
  font-weight: 600;
  letter-spacing: 0.01em;
  color: #fff;
  text-decoration: none;
}

.site-header__brand-mark {
  font-family: var(--font-mono);
  font-size: 12px;
  color: var(--accent);
  border: 1px solid var(--accent);
  border-radius: 4px;
  padding: 1px 6px;
}

.site-nav {
  display: flex;
  align-items: center;
  gap: 4px;
}

.site-nav a {
  color: #b8c2cc;
  text-decoration: none;
  font-size: 14px;
  padding: 8px 12px;
  border-radius: var(--radius);
  transition: background-color 0.12s ease, color 0.12s ease;
}

.site-nav a:hover {
  background: var(--ink-700);
  color: #fff;
}

.site-nav a.is-active {
  color: #fff;
  background: var(--ink-700);
}

.site-header__user {
  display: flex;
  align-items: center;
  gap: 12px;
  margin-left: 16px;
  padding-left: 16px;
  border-left: 1px solid var(--ink-700);
}

.site-header__user span {
  font-size: 13px;
  color: #9aa5b1;
  font-family: var(--font-mono);
}

.btn-logout {
  font-size: 13px;
  color: #b8c2cc;
  text-decoration: none;
  padding: 6px 10px;
  border-radius: var(--radius);
  border: 1px solid var(--ink-700);
}

.btn-logout:hover {
  color: #fff;
  border-color: #445261;
}

/* ---------- Main / container ---------- */

.main {
  flex: 1;
  width: 100%;
  max-width: 1080px;
  margin: 0 auto;
  padding: 32px 24px;
}

.mail-container {
  background: var(--paper-000);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 32px;
  box-shadow: 0 1px 2px rgba(18, 24, 31, 0.04);
}

.mail-container--narrow {
  max-width: 400px;
  margin: 48px auto;
}

.mail-container h1 {
  font-size: 20px;
  margin: 0 0 4px;
}

.mail-container h2 {
  font-size: 16px;
  margin: 0 0 16px;
  color: var(--text-muted);
  font-weight: 500;
}

.page-title {
  margin-bottom: 20px;
}

.page-title h1 {
  font-size: 22px;
  margin: 0 0 4px;
}

.page-title p {
  margin: 0;
  color: var(--text-muted);
  font-size: 14px;
}

/* ---------- Forms ---------- */

.field {
  margin-bottom: 16px;
}

.field label {
  display: block;
  font-size: 13px;
  font-weight: 600;
  margin-bottom: 6px;
  color: var(--ink-800);
}

.field input[type="text"],
.field input[type="password"] {
  width: 100%;
  padding: 10px 12px;
  border: 1px solid var(--border);
  border-radius: var(--radius);
  font-size: 14px;
  font-family: var(--font-ui);
  background: var(--paper-100);
  transition: border-color 0.12s ease, background-color 0.12s ease;
}

.field input[type="text"]:focus,
.field input[type="password"]:focus {
  outline: 2px solid var(--accent);
  outline-offset: 0;
  border-color: var(--accent);
  background: #fff;
}

.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 6px;
  padding: 10px 18px;
  border-radius: var(--radius);
  border: 1px solid transparent;
  font-size: 14px;
  font-weight: 600;
  cursor: pointer;
  text-decoration: none;
  transition: background-color 0.12s ease, border-color 0.12s ease;
}

.btn-primary {
  background: var(--accent);
  color: #fff;
  width: 100%;
}

.btn-primary:hover {
  background: var(--accent-dark);
}

.btn-secondary {
  background: var(--paper-000);
  color: var(--ink-800);
  border-color: var(--border);
}

.btn-secondary:hover {
  border-color: #b7c1cb;
}

.btn-danger {
  background: var(--danger);
  color: #fff;
}

.btn-danger:hover {
  background: var(--danger-dark);
}

/* ---------- Alerts ---------- */

.alert {
  border-radius: var(--radius);
  padding: 12px 14px;
  font-size: 14px;
  margin-bottom: 18px;
  border: 1px solid transparent;
}

.alert-error {
  background: #fbeceb;
  border-color: #f0c6c3;
  color: var(--danger-dark);
}

.alert-success {
  background: #eaf5ee;
  border-color: #c6e4d0;
  color: #2d6b45;
}

/* ---------- Dashboard grid / cards ---------- */

.card-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(220px, 1fr));
  gap: 16px;
}

.action-card {
  display: block;
  background: var(--paper-000);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 20px;
  text-decoration: none;
  color: inherit;
  transition: border-color 0.12s ease, transform 0.08s ease;
}

.action-card:hover {
  border-color: var(--accent);
}

.action-card__tag {
  font-family: var(--font-mono);
  font-size: 11px;
  text-transform: uppercase;
  letter-spacing: 0.06em;
  color: var(--accent-dark);
  display: block;
  margin-bottom: 8px;
}

.action-card h3 {
  margin: 0 0 6px;
  font-size: 16px;
}

.action-card p {
  margin: 0;
  font-size: 13px;
  color: var(--text-muted);
}

.empty-state {
  border: 1px dashed var(--border);
  border-radius: var(--radius);
  padding: 32px;
  text-align: center;
  color: var(--text-muted);
}

table.data-table {
  width: 100%;
  border-collapse: collapse;
  font-size: 14px;
}

table.data-table th,
table.data-table td {
  text-align: left;
  padding: 10px 12px;
  border-bottom: 1px solid var(--border);
}

table.data-table th {
  color: var(--text-muted);
  font-weight: 600;
  font-size: 12px;
  text-transform: uppercase;
  letter-spacing: 0.04em;
}

.badge {
  display: inline-block;
  font-family: var(--font-mono);
  font-size: 11px;
  padding: 2px 8px;
  border-radius: 999px;
  background: var(--paper-100);
  border: 1px solid var(--border);
  color: var(--text-muted);
}

/* ---------- Footer ---------- */

.site-footer {
  background: var(--ink-900);
  color: #7c8794;
  font-size: 12px;
  border-top: 1px solid var(--ink-700);
}

.site-footer__inner {
  max-width: 1080px;
  margin: 0 auto;
  padding: 16px 24px;
  display: flex;
  justify-content: space-between;
  gap: 12px;
  font-family: var(--font-mono);
}

@media (max-width: 640px) {
  .site-header__inner {
    flex-wrap: wrap;
    height: auto;
    padding: 12px 16px;
  }
  .site-nav {
    order: 3;
    width: 100%;
    justify-content: flex-start;
  }
  .main {
    padding: 20px 16px;
  }
  .mail-container {
    padding: 20px;
  }
}