:root {
  --bg: #ffffff;
  --panel: #ffffff;
  --line: #d9dce2;
  --text: #1a1f2b;
  --muted: #5f6675;
  --brand: #c20d17;
  --ok: #147b42;
  --warn: #b26b11;
  --bad: #b3261e;
}

* {
  box-sizing: border-box;
}

html {
  scroll-behavior: smooth;
}

body {
  margin: 0;
  font-family: "Noto Sans Thai", "Segoe UI", Tahoma, Arial, sans-serif;
  color: var(--text);
  background: var(--bg);
}

button,
input,
select,
textarea {
  font-family: "Noto Sans Thai", "Segoe UI", Tahoma, Arial, sans-serif;
}

.site-header {
  background: #0b0b0b;
  border-top: 6px solid var(--brand);
  border-bottom: 2px solid var(--brand);
  box-shadow: 0 10px 20px rgba(0, 0, 0, 0.18);
}

.site-header__inner {
  max-width: 1200px;
  margin: 0 auto;
  padding: 10px 16px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 12px;
  flex-wrap: wrap;
}

.brand {
  display: inline-flex;
  align-items: center;
  text-decoration: none;
}

.brand img {
  height: 42px;
  width: auto;
  display: block;
}

.top-nav {
  display: flex;
  gap: 8px;
  align-items: center;
  flex-wrap: wrap;
}

.top-nav a {
  color: #ffffff;
  text-decoration: none;
  border: 1px solid rgba(255, 255, 255, 0.24);
  border-radius: 999px;
  padding: 7px 12px;
  font-size: 13px;
  font-weight: 600;
  letter-spacing: 0.2px;
  transition: all 0.2s ease;
}

.top-nav a:hover {
  border-color: var(--brand);
  background: var(--brand);
}

.wrapper {
  max-width: 1200px;
  margin: 0 auto;
  padding: 20px 16px 40px;
}

.header {
  display: flex;
  justify-content: space-between;
  gap: 10px;
  flex-wrap: wrap;
  align-items: center;
  margin-bottom: 16px;
}

h1 {
  margin: 0;
  font-size: 24px;
}

.hint {
  margin: 2px 0 0;
  color: var(--muted);
  font-size: 14px;
}

.grid {
  display: grid;
  grid-template-columns: repeat(12, minmax(0, 1fr));
  gap: 12px;
}

.card {
  grid-column: span 12;
  background: var(--panel);
  border: 1px solid var(--line);
  border-radius: 12px;
  padding: 14px;
  box-shadow: 0 8px 20px rgba(11, 15, 22, 0.05);
}

.card h2 {
  margin: 0 0 10px;
  font-size: 18px;
}

@media (min-width: 900px) {
  .span-4,
  .span4 {
    grid-column: span 4;
  }
  .span-5,
  .span5 {
    grid-column: span 5;
  }
  .span-6,
  .span6 {
    grid-column: span 6;
  }
  .span-7,
  .span7 {
    grid-column: span 7;
  }
  .span-8,
  .span8 {
    grid-column: span 8;
  }
  .span-12,
  .span12 {
    grid-column: span 12;
  }
}

label {
  display: block;
  font-size: 13px;
  margin-bottom: 5px;
  color: var(--muted);
}

input[type="text"],
input[type="email"],
input[type="number"],
input[type="password"],
select,
textarea {
  width: 100%;
  border: 1px solid #c8ced8;
  border-radius: 8px;
  background: #fff;
  color: #1a2437;
  padding: 9px 10px;
  font-size: 14px;
}

textarea {
  min-height: 130px;
  resize: vertical;
}

.row {
  display: grid;
  grid-template-columns: repeat(12, minmax(0, 1fr));
  gap: 10px;
}

.col-12 {
  grid-column: span 12;
}
.col-6 {
  grid-column: span 12;
}
.col-4 {
  grid-column: span 12;
}
.col-3 {
  grid-column: span 12;
}

@media (min-width: 700px) {
  .col-6 {
    grid-column: span 6;
  }
  .col-4 {
    grid-column: span 4;
  }
  .col-3 {
    grid-column: span 3;
  }
}

.actions {
  margin-top: 10px;
  display: flex;
  gap: 8px;
  align-items: center;
  flex-wrap: wrap;
}

button,
.button-link {
  border: 0;
  border-radius: 8px;
  background: var(--brand);
  color: #fff;
  padding: 10px 14px;
  font-size: 14px;
  cursor: pointer;
  text-decoration: none;
  display: inline-block;
}

button.secondary,
.button-link.secondary {
  background: #4a5568;
}

.flash {
  border-radius: 8px;
  padding: 10px 12px;
  margin: 0 0 14px;
  font-size: 14px;
}

.flash.success {
  background: #e7f7ee;
  border: 1px solid #b9e7cb;
  color: var(--ok);
}
.flash.error {
  background: #fdecec;
  border: 1px solid #f7c0bc;
  color: var(--bad);
}
.flash.info {
  background: #edf5ff;
  border: 1px solid #cddff8;
  color: #204f8f;
}

.stats {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 10px;
}

@media (min-width: 880px) {
  .stats {
    grid-template-columns: repeat(4, minmax(0, 1fr));
  }
}

.stat {
  border: 1px solid var(--line);
  border-radius: 10px;
  padding: 12px;
  background: #ffffff;
}

.stat .n {
  font-size: 24px;
  font-weight: 700;
}

.stat .t {
  font-size: 13px;
  color: var(--muted);
}

.table-wrap {
  overflow: auto;
}

table {
  width: 100%;
  border-collapse: collapse;
  min-width: 760px;
}

th,
td {
  border-bottom: 1px solid #e0e4ea;
  padding: 8px;
  font-size: 13px;
  text-align: left;
  vertical-align: top;
}

th {
  background: #f7f9fc;
  color: #425068;
}

.badge {
  display: inline-block;
  border-radius: 999px;
  padding: 3px 10px;
  font-size: 12px;
}

.badge.pending {
  background: #fff3db;
  color: var(--warn);
}
.badge.sent {
  background: #def7e7;
  color: var(--ok);
}
.badge.failed {
  background: #ffe3e0;
  color: var(--bad);
}

.mono {
  font-family: Consolas, Menlo, monospace;
}

.small {
  font-size: 12px;
  color: var(--muted);
}

@media (max-width: 680px) {
  .site-header__inner {
    justify-content: center;
  }
  .top-nav {
    justify-content: center;
  }
  .brand img {
    height: 36px;
  }
}