:root {
  color-scheme: dark;
  --bg: #0b1020;
  --panel: #111827;
  --panel-soft: #172033;
  --text: #e5e7eb;
  --muted: #9ca3af;
  --border: #263244;
  --brand: #5eead4;
  --brand-strong: #14b8a6;
  --danger: #fb7185;
  --warning: #fbbf24;
  --success: #34d399;
  --shadow: 0 24px 80px rgba(0, 0, 0, 0.35);
  --radius: 18px;
}

* { box-sizing: border-box; }

body {
  margin: 0;
  font-family: Inter, ui-sans-serif, system-ui, -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;
  background:
    radial-gradient(circle at top left, rgba(20, 184, 166, 0.22), transparent 28rem),
    radial-gradient(circle at 75% 10%, rgba(59, 130, 246, 0.18), transparent 24rem),
    var(--bg);
  color: var(--text);
  min-height: 100vh;
}

button, input, textarea { font: inherit; }

button {
  border: 0;
  cursor: pointer;
  border-radius: 12px;
  padding: 0.85rem 1rem;
  font-weight: 700;
  transition: transform 0.16s ease, opacity 0.16s ease, border-color 0.16s ease, background 0.16s ease;
}
button:hover:not(:disabled) { transform: translateY(-1px); }
button:disabled { opacity: 0.45; cursor: not-allowed; }

.primary { color: #042f2e; background: linear-gradient(135deg, var(--brand), var(--brand-strong)); }
.secondary { color: var(--text); background: var(--panel-soft); border: 1px solid var(--border); }
.ghost { color: var(--text); background: transparent; border: 1px solid var(--border); }
.danger { color: #fff; background: rgba(251, 113, 133, 0.18); border: 1px solid rgba(251, 113, 133, 0.45); }
.full { width: 100%; }

.app-header {
  max-width: 1180px;
  margin: 0 auto;
  padding: 48px 22px 18px;
  display: flex;
  justify-content: space-between;
  gap: 24px;
  align-items: end;
}
.app-header h1 {
  font-size: clamp(2rem, 5vw, 4rem);
  line-height: 0.95;
  margin: 8px 0 14px;
  letter-spacing: -0.06em;
}
.app-header p { color: var(--muted); max-width: 680px; margin: 0; font-size: 1.05rem; line-height: 1.55; }
.eyebrow { color: var(--brand); font-weight: 800; letter-spacing: 0.16em; text-transform: uppercase; font-size: 0.78rem; }

.status-card {
  min-width: 250px;
  border: 1px solid var(--border);
  background: rgba(17, 24, 39, 0.72);
  backdrop-filter: blur(16px);
  border-radius: var(--radius);
  padding: 16px;
  display: flex;
  gap: 12px;
  align-items: center;
  box-shadow: var(--shadow);
}
.status-card strong, .status-card small { display: block; }
.status-card small { color: var(--muted); margin-top: 4px; }
.status-dot {
  width: 12px; height: 12px; border-radius: 999px; background: var(--warning);
  box-shadow: 0 0 0 6px rgba(251, 191, 36, 0.12); flex: 0 0 auto;
}
.status-dot.is-ok { background: var(--success); box-shadow: 0 0 0 6px rgba(52, 211, 153, 0.12); }
.status-dot.is-error { background: var(--danger); box-shadow: 0 0 0 6px rgba(251, 113, 133, 0.12); }
.status-dot.is-loading { animation: pulse 1s ease-in-out infinite; }
@keyframes pulse { 0%, 100% { opacity: 0.45; } 50% { opacity: 1; } }

.layout {
  max-width: 1180px;
  margin: 0 auto;
  padding: 18px 22px 42px;
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 18px;
}
.panel {
  background: rgba(17, 24, 39, 0.82);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 20px;
  box-shadow: var(--shadow);
}
.span-2 { grid-column: span 2; }
.panel-header { display: flex; align-items: center; justify-content: space-between; gap: 14px; margin-bottom: 18px; }
.panel-header > div:first-child { display: flex; gap: 12px; align-items: center; }
.panel h2 { margin: 0; font-size: 1.25rem; letter-spacing: -0.02em; }
.step {
  width: 34px; height: 34px; border-radius: 12px; display: inline-grid; place-items: center;
  background: rgba(94, 234, 212, 0.11); color: var(--brand); font-weight: 900;
  border: 1px solid rgba(94, 234, 212, 0.22);
}
.actions, .button-row { display: flex; gap: 10px; flex-wrap: wrap; }
.grid { display: grid; gap: 16px; }
.grid.two { grid-template-columns: repeat(2, minmax(0, 1fr)); }
.grid.compact { gap: 12px; }

label { display: grid; gap: 8px; }
label > span, .label-like { color: var(--text); font-weight: 700; }
small, .muted { color: var(--muted); line-height: 1.45; }
input, textarea {
  width: 100%; background: #0d1424; color: var(--text); border: 1px solid var(--border);
  border-radius: 12px; padding: 0.9rem 1rem; outline: none;
  transition: border-color 0.16s ease, box-shadow 0.16s ease;
}
textarea { resize: vertical; }
input:focus, textarea:focus { border-color: rgba(94, 234, 212, 0.75); box-shadow: 0 0 0 4px rgba(94, 234, 212, 0.1); }
.code-editor { font-family: ui-monospace, SFMono-Regular, Menlo, Monaco, Consolas, monospace; font-size: 0.92rem; min-height: 420px; }

.file-drop {
  min-height: 180px; border: 1px dashed rgba(94, 234, 212, 0.42); border-radius: 16px;
  background: rgba(94, 234, 212, 0.05); display: grid; place-items: center; text-align: center;
  padding: 22px; cursor: pointer;
}
.file-drop input { display: none; }
.file-drop strong { font-size: 1.1rem; }
.file-drop span { color: var(--muted); max-width: 360px; line-height: 1.45; }
.file-name { color: var(--muted); margin-top: 10px; font-size: 0.92rem; }
.notice {
  margin-top: 16px; padding: 14px 16px; border: 1px solid rgba(94, 234, 212, 0.22);
  background: rgba(94, 234, 212, 0.07); border-radius: 14px; display: flex; gap: 8px; flex-wrap: wrap; color: #ccfbf1;
}
.stats-grid { display: grid; grid-template-columns: repeat(4, minmax(0, 1fr)); gap: 12px; margin: 18px 0; }
.stat { border: 1px solid var(--border); border-radius: 14px; padding: 16px; background: rgba(15, 23, 42, 0.62); }
.stat strong { display: block; font-size: 1.65rem; letter-spacing: -0.04em; }
.stat span { color: var(--muted); font-size: 0.92rem; }
.recipient-preview { border-top: 1px solid var(--border); padding-top: 12px; }
.recipient-preview summary { cursor: pointer; color: var(--muted); font-weight: 700; margin-bottom: 12px; }
.chips { display: flex; gap: 8px; flex-wrap: wrap; max-height: 180px; overflow: auto; }
.chips.empty { color: var(--muted); }
.chip { border: 1px solid var(--border); background: #0d1424; border-radius: 999px; padding: 7px 10px; font-size: 0.9rem; color: #cbd5e1; }
.preview-panel { display: grid; gap: 8px; min-height: 420px; }
.preview-panel iframe { width: 100%; height: 100%; min-height: 420px; border: 1px solid var(--border); border-radius: 14px; background: #fff; }
.progress-wrap { margin-top: 18px; }
.progress-meta { display: flex; justify-content: space-between; gap: 10px; color: var(--muted); font-size: 0.92rem; margin-bottom: 8px; }
.progress { background: #0d1424; border: 1px solid var(--border); border-radius: 999px; overflow: hidden; height: 12px; }
.progress > div { width: 0%; height: 100%; background: linear-gradient(90deg, var(--brand), var(--brand-strong)); transition: width 0.2s ease; }
.message-box { padding: 14px 16px; border-radius: 14px; margin-bottom: 14px; border: 1px solid var(--border); background: #0d1424; color: #cbd5e1; white-space: pre-wrap; }
.message-box.success { border-color: rgba(52, 211, 153, 0.4); background: rgba(52, 211, 153, 0.09); }
.message-box.error { border-color: rgba(251, 113, 133, 0.4); background: rgba(251, 113, 133, 0.09); }
.logs { display: grid; gap: 10px; color: var(--muted); }
.log-item { display: grid; gap: 6px; border: 1px solid var(--border); border-radius: 14px; padding: 12px; background: rgba(15, 23, 42, 0.58); }
.log-item strong { color: var(--text); overflow-wrap: anywhere; }
.log-item .meta { display: flex; gap: 8px; flex-wrap: wrap; font-size: 0.88rem; }
.badge { display: inline-flex; align-items: center; border-radius: 999px; border: 1px solid var(--border); padding: 3px 8px; color: #cbd5e1; }
.badge.sent, .badge.test_sent { color: #bbf7d0; border-color: rgba(52, 211, 153, 0.35); }
.badge.error, .badge.test_error, .badge.rate_limited { color: #fecdd3; border-color: rgba(251, 113, 133, 0.35); }
.badge.suppressed { color: #fde68a; border-color: rgba(251, 191, 36, 0.35); }
.footer { max-width: 1180px; margin: 0 auto; padding: 0 22px 48px; color: var(--muted); line-height: 1.5; }
code { color: #99f6e4; }

@media (max-width: 880px) {
  .app-header { align-items: stretch; flex-direction: column; }
  .layout, .grid.two, .stats-grid { grid-template-columns: 1fr; }
  .span-2 { grid-column: span 1; }
  .panel-header { align-items: stretch; flex-direction: column; }
  .panel-header > div:first-child { align-items: flex-start; }
}