:root {
  --bg: #f4f8fb;
  --card-bg: #ffffff;
  --text: #0b1120;
  --muted: #5b6b82;
  --border: #dbe4ee;
  --primary: #0ea5e9;
  --primary-hover: #0284c7;
  --primary-gradient: linear-gradient(90deg, #2563eb, #22d3ee);
  --accent: #0284c7;
  --success-bg: #ecfdf3;
  --success-text: #027a48;
  --error-bg: #fef3f2;
  --error-text: #b42318;
  --pending-bg: #fff8e6;
  --pending-text: #92660a;
}

@media (prefers-color-scheme: dark) {
  :root {
    --bg: #0a0e1a;
    --card-bg: #101623;
    --text: #eaf2fb;
    --muted: #8695ac;
    --border: #1e293b;
    --primary: #22d3ee;
    --primary-hover: #67e8f9;
    --primary-gradient: linear-gradient(90deg, #2563eb, #22d3ee);
    --accent: #38bdf8;
    --success-bg: #0d2b1c;
    --success-text: #4ade80;
    --error-bg: #2c1414;
    --error-text: #f87171;
    --pending-bg: #2a2410;
    --pending-text: #facc15;
  }
}

/* Manual toggle overrides - win over the system prefers-color-scheme above */
:root[data-theme="light"] {
  --bg: #f4f8fb;
  --card-bg: #ffffff;
  --text: #0b1120;
  --muted: #5b6b82;
  --border: #dbe4ee;
  --primary: #0ea5e9;
  --primary-hover: #0284c7;
  --primary-gradient: linear-gradient(90deg, #2563eb, #22d3ee);
  --accent: #0284c7;
  --success-bg: #ecfdf3;
  --success-text: #027a48;
  --error-bg: #fef3f2;
  --error-text: #b42318;
  --pending-bg: #fff8e6;
  --pending-text: #92660a;
}

:root[data-theme="dark"] {
  --bg: #0a0e1a;
  --card-bg: #101623;
  --text: #eaf2fb;
  --muted: #8695ac;
  --border: #1e293b;
  --primary: #22d3ee;
  --primary-hover: #67e8f9;
  --primary-gradient: linear-gradient(90deg, #2563eb, #22d3ee);
  --accent: #38bdf8;
  --success-bg: #0d2b1c;
  --success-text: #4ade80;
  --error-bg: #2c1414;
  --error-text: #f87171;
  --pending-bg: #2a2410;
  --pending-text: #facc15;
}

.theme-toggle {
  position: fixed;
  top: 1rem;
  right: 1rem;
  z-index: 1000;
  width: 2.5rem;
  height: 2.5rem;
  border-radius: 50%;
  border: 1px solid var(--border);
  background: var(--card-bg);
  color: var(--text);
  font-size: 1.1rem;
  cursor: pointer;
  display: flex;
  align-items: center;
  justify-content: center;
  box-shadow: 0 2px 6px rgba(0, 0, 0, 0.15);
}

.theme-toggle:hover {
  opacity: 0.85;
}

* {
  box-sizing: border-box;
}

body {
  margin: 0;
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Helvetica, Arial, sans-serif;
  background: var(--bg);
  color: var(--text);
}

.auth-gate {
  position: fixed;
  inset: 0;
  display: flex;
  align-items: center;
  justify-content: center;
  background: var(--bg);
  padding: 1.5rem;
}

.auth-gate[hidden] {
  display: none;
}

.auth-box {
  width: 100%;
  max-width: 360px;
  background: var(--card-bg);
  border: 1px solid var(--border);
  border-radius: 12px;
  padding: 2rem;
  text-align: center;
}

.auth-box h1 {
  margin: 0 0 0.25rem;
  font-size: 1.5rem;
}

.auth-box .field {
  text-align: left;
  margin: 1.25rem 0 1rem;
}

.password-wrap {
  position: relative;
  display: flex;
}

.password-wrap input {
  flex: 1;
  padding-right: 2.5rem;
}

.toggle-password {
  position: absolute;
  right: 0.5rem;
  top: 50%;
  transform: translateY(-50%);
  background: none;
  border: none;
  cursor: pointer;
  font-size: 1.1rem;
  opacity: 0.6;
  padding: 0.25rem;
  line-height: 1;
}

.toggle-password:hover {
  opacity: 1;
}

.auth-box .btn {
  width: 100%;
}

.topbar {
  padding: 2rem 1.5rem 1rem;
  text-align: center;
}

.topbar h1 {
  margin: 0;
  font-size: 1.75rem;
}

.brand {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 0.6rem;
  margin: 0;
}

.logo-badge {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 34px;
  height: 34px;
  border-radius: 10px;
  background: var(--primary-gradient);
  color: #04121f;
  flex-shrink: 0;
}

.wordmark {
  font-weight: 700;
}

.accent-text {
  color: var(--accent);
}

.subtitle {
  margin: 0.25rem 0 0;
  color: var(--muted);
}

.layout {
  max-width: 720px;
  margin: 0 auto;
  padding: 0 1.5rem 3rem;
  display: flex;
  flex-direction: column;
  gap: 1.5rem;
}

.card {
  background: var(--card-bg);
  border: 1px solid var(--border);
  border-radius: 12px;
  padding: 1.5rem;
}

.card h2 {
  margin-top: 0;
  font-size: 1.1rem;
}

.card-header-row {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 1rem;
}

.field {
  display: flex;
  flex-direction: column;
  gap: 0.4rem;
  margin-bottom: 1rem;
  font-size: 0.9rem;
  color: var(--muted);
}

.field input,
.field textarea {
  font: inherit;
  color: var(--text);
  background: var(--bg);
  border: 1px solid var(--border);
  border-radius: 8px;
  padding: 0.6rem 0.75rem;
}

.field input:focus,
.field textarea:focus {
  outline: 2px solid var(--primary);
  outline-offset: 1px;
}

.field-row {
  display: flex;
  gap: 1rem;
}

.field-row .field {
  flex: 1;
  min-width: 0;
}

.btn {
  font: inherit;
  font-weight: 600;
  border: none;
  border-radius: 8px;
  padding: 0.65rem 1.25rem;
  cursor: pointer;
}

.btn.primary {
  background: var(--primary-gradient);
  color: #04121f;
}

.btn.primary:hover {
  filter: brightness(1.08);
}

.btn.primary:disabled {
  opacity: 0.6;
  cursor: not-allowed;
}

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

.status {
  margin-top: 0.75rem;
  font-size: 0.9rem;
}

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

.status.success {
  background: var(--success-bg);
  color: var(--success-text);
  padding: 0.5rem 0.75rem;
  border-radius: 8px;
}

.status.error {
  background: var(--error-bg);
  color: var(--error-text);
  padding: 0.5rem 0.75rem;
  border-radius: 8px;
}

.table-wrap {
  overflow-x: auto;
}

table {
  width: 100%;
  border-collapse: collapse;
  font-size: 0.9rem;
}

th, td {
  text-align: left;
  padding: 0.5rem 0.6rem;
  border-bottom: 1px solid var(--border);
  white-space: nowrap;
}

td.empty {
  color: var(--muted);
  white-space: normal;
}

.badge {
  display: inline-block;
  padding: 0.15rem 0.55rem;
  border-radius: 999px;
  font-size: 0.78rem;
  font-weight: 600;
  text-transform: capitalize;
}

.badge.pending {
  background: var(--pending-bg);
  color: var(--pending-text);
}

.badge.sent {
  background: var(--success-bg);
  color: var(--success-text);
}

.badge.failed {
  background: var(--error-bg);
  color: var(--error-text);
}

.badge.unsubscribed {
  background: var(--border);
  color: var(--muted);
}

.field-checkbox {
  display: flex;
  align-items: center;
  gap: 0.5rem;
  margin-bottom: 1rem;
  font-size: 0.9rem;
  color: var(--muted);
}

.field-checkbox input {
  width: 1rem;
  height: 1rem;
}

.preview-row {
  margin-bottom: 1rem;
}

.preview-panel {
  margin-bottom: 1rem;
  border: 1px solid var(--border);
  border-radius: 8px;
  overflow: hidden;
}

.preview-header {
  padding: 0.6rem 0.75rem;
  background: var(--bg);
  border-bottom: 1px solid var(--border);
  font-size: 0.9rem;
}

.preview-frame {
  width: 100%;
  height: 300px;
  border: none;
  background: #fff;
}

@media (max-width: 520px) {
  .field-row {
    flex-direction: column;
    gap: 0;
  }
}