:root {
  --bg: #f4f5f7;
  --card: #ffffff;
  --text: #1c1e21;
  --muted: #6b7280;
  --border: #e3e5e8;
  --primary: #e8590c;
  --primary-hover: #d9480f;
  --ok: #2b8a3e;
  --ok-bg: #ebfbee;
  --warn: #b35c00;
  --warn-bg: #fff4e6;
  --bad: #c92a2a;
  --bad-bg: #fff5f5;
}

@media (prefers-color-scheme: dark) {
  :root {
    --bg: #111317;
    --card: #1b1e24;
    --text: #e8eaed;
    --muted: #9aa0a6;
    --border: #2c3038;
    --ok-bg: #12301b;
    --warn-bg: #3a2a12;
    --bad-bg: #3a1616;
    --ok: #69db7c;
    --warn: #ffa94d;
    --bad: #ff8787;
  }
}

* { box-sizing: border-box; }

body {
  margin: 0;
  background: var(--bg);
  color: var(--text);
  font: 16px/1.5 -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, sans-serif;
}

.container {
  max-width: 640px;
  margin: 0 auto;
  padding: 32px 16px 64px;
}

.header { text-align: center; margin-bottom: 24px; }
.logo { font-size: 28px; font-weight: 700; color: var(--text); text-decoration: none; }
.tagline { margin: 4px 0 0; color: var(--muted); }

.card {
  background: var(--card);
  border: 1px solid var(--border);
  border-radius: 16px;
  padding: 24px;
  box-shadow: 0 4px 24px rgba(0, 0, 0, 0.05);
}
.card h1 { font-size: 22px; margin: 0 0 16px; }
.center { text-align: center; }
.icon { font-size: 48px; margin-bottom: 8px; }

textarea, input[type="text"] {
  width: 100%;
  font: inherit;
  color: var(--text);
  background: var(--bg);
  border: 1px solid var(--border);
  border-radius: 10px;
  padding: 12px 14px;
}
textarea { min-height: 200px; resize: vertical; }
textarea:focus, input:focus { outline: 2px solid var(--primary); outline-offset: -1px; }

.row {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 12px;
  margin-top: 12px;
  flex-wrap: wrap;
}

.btn {
  display: inline-block;
  font: inherit;
  font-weight: 600;
  border-radius: 10px;
  padding: 10px 18px;
  border: 1px solid transparent;
  cursor: pointer;
  text-decoration: none;
  text-align: center;
}
.btn:disabled { opacity: 0.6; cursor: wait; }
.btn.primary { background: var(--primary); color: #fff; }
.btn.primary:hover:not(:disabled) { background: var(--primary-hover); }
.btn.ghost { background: transparent; color: var(--text); border-color: var(--border); }
.btn.ghost:hover { background: var(--bg); }
.btn.big { font-size: 18px; padding: 14px 28px; margin: 8px 0; }

.muted { color: var(--muted); font-size: 14px; }

.hints { margin: 20px 0 0; padding-left: 20px; color: var(--muted); font-size: 14px; }

.link-box { display: flex; gap: 8px; margin: 16px 0; }
.link-box input { flex: 1; min-width: 0; font-family: ui-monospace, Menlo, monospace; font-size: 14px; }

.status-line {
  display: flex;
  align-items: center;
  gap: 12px;
  flex-wrap: wrap;
  margin-bottom: 20px;
}

.badge {
  display: inline-block;
  padding: 4px 10px;
  border-radius: 999px;
  font-size: 14px;
  font-weight: 600;
}
.badge.waiting { background: var(--warn-bg); color: var(--warn); }
.badge.read { background: var(--ok-bg); color: var(--ok); }
.badge.expired { background: var(--bad-bg); color: var(--bad); }

.message-text {
  white-space: pre-wrap;
  word-wrap: break-word;
  background: var(--bg);
  border: 1px solid var(--border);
  border-radius: 10px;
  padding: 16px;
  min-height: 80px;
}

.warning {
  background: var(--warn-bg);
  color: var(--warn);
  border-radius: 10px;
  padding: 10px 14px;
  font-size: 14px;
}

.error {
  margin-top: 16px;
  background: var(--bad-bg);
  color: var(--bad);
  border-radius: 10px;
  padding: 12px 16px;
}

@media (max-width: 480px) {
  .link-box { flex-direction: column; }
  .card { padding: 18px; }
}