:root {
  --bg: #0f1220;
  --bg-grad-a: #1b1f3b;
  --bg-grad-b: #0f1220;
  --card: #171b2e;
  --card-border: #2a2f4a;
  --text: #eef0fb;
  --text-dim: #9aa0c3;
  --accent: #6c7bff;
  --accent-hover: #8291ff;
  --accent-text: #ffffff;
  --danger: #ff6b6b;
  --success: #35d07f;
  --field-bg: #10142a;
}

* { box-sizing: border-box; }

body {
  margin: 0;
  min-height: 100vh;
  background: radial-gradient(circle at top, var(--bg-grad-a), var(--bg-grad-b) 60%);
  color: var(--text);
  font-family: 'Segoe UI', system-ui, -apple-system, Roboto, Helvetica, Arial, sans-serif;
  display: flex;
  justify-content: center;
  padding: 24px 16px 48px;
}

.wrap { width: 100%; max-width: 620px; }

.topbar { text-align: center; margin-bottom: 22px; }
.brand { font-size: 28px; font-weight: 700; letter-spacing: .3px; }
.brand-icon { filter: drop-shadow(0 0 8px rgba(108,123,255,.6)); }
.tagline { color: var(--text-dim); font-size: 14px; margin-top: 4px; }

.card {
  background: var(--card);
  border: 1px solid var(--card-border);
  border-radius: 18px;
  padding: 20px;
  box-shadow: 0 20px 60px rgba(0,0,0,.35);
}

.mode-switch {
  display: flex;
  gap: 8px;
  background: var(--field-bg);
  padding: 4px;
  border-radius: 12px;
  margin-bottom: 14px;
}
.mode-btn {
  flex: 1;
  border: none;
  background: transparent;
  color: var(--text-dim);
  padding: 10px 12px;
  border-radius: 9px;
  font-size: 14px;
  font-weight: 600;
  cursor: pointer;
  transition: background .15s, color .15s;
}
.mode-btn.active { background: var(--accent); color: var(--accent-text); }

.domain-row {
  display: flex;
  align-items: center;
  gap: 10px;
  margin-bottom: 14px;
}
.domain-label {
  font-size: 12px;
  color: var(--text-dim);
  text-transform: uppercase;
  letter-spacing: .6px;
  white-space: nowrap;
}
.domain-select {
  flex: 1;
  background: var(--field-bg);
  border: 1px solid var(--card-border);
  color: var(--text);
  font-size: 14px;
  font-weight: 600;
  padding: 9px 10px;
  border-radius: 10px;
  outline: none;
  cursor: pointer;
}

.custom-row {
  display: flex;
  align-items: center;
  gap: 6px;
  background: var(--field-bg);
  border: 1px solid var(--card-border);
  border-radius: 12px;
  padding: 8px 10px;
  margin-bottom: 14px;
  flex-wrap: wrap;
}
.custom-row input {
  flex: 1;
  min-width: 120px;
  background: transparent;
  border: none;
  outline: none;
  color: var(--text);
  font-size: 15px;
  padding: 6px 4px;
}
.domain-suffix { color: var(--text-dim); font-size: 14px; white-space: nowrap; }

.hidden { display: none !important; }

.address-box { margin-bottom: 18px; }
.address-row { display: flex; gap: 8px; }
.address-field {
  flex: 1;
  background: var(--field-bg);
  border: 1px solid var(--card-border);
  color: var(--text);
  font-size: 17px;
  font-weight: 600;
  padding: 12px 14px;
  border-radius: 12px;
  outline: none;
  letter-spacing: .2px;
}
.meta-row {
  display: flex;
  align-items: center;
  justify-content: space-between;
  margin-top: 10px;
  gap: 10px;
  flex-wrap: wrap;
}

.timer {
  font-variant-numeric: tabular-nums;
  font-weight: 700;
  font-size: 15px;
  color: var(--success);
  background: rgba(53,208,127,.12);
  padding: 6px 12px;
  border-radius: 999px;
}
.timer.warn { color: var(--danger); background: rgba(255,107,107,.14); }

.btn {
  border: none;
  border-radius: 10px;
  padding: 10px 16px;
  font-size: 14px;
  font-weight: 600;
  cursor: pointer;
  transition: filter .15s, transform .1s;
}
.btn:active { transform: scale(.97); }
.btn.primary { background: var(--accent); color: var(--accent-text); }
.btn.primary:hover { background: var(--accent-hover); }
.icon-btn {
  background: var(--field-bg);
  color: var(--text);
  border: 1px solid var(--card-border);
  padding: 10px 12px;
}
.icon-btn:hover { filter: brightness(1.2); }

.error-msg {
  margin-top: 10px;
  color: var(--danger);
  font-size: 13px;
  background: rgba(255,107,107,.1);
  border: 1px solid rgba(255,107,107,.3);
  padding: 8px 10px;
  border-radius: 8px;
}

.inbox-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  margin-bottom: 10px;
}
.inbox-header h2 { font-size: 15px; margin: 0; color: var(--text-dim); text-transform: uppercase; letter-spacing: .6px; }
.badge {
  background: var(--field-bg);
  border: 1px solid var(--card-border);
  color: var(--text);
  font-size: 12px;
  font-weight: 700;
  padding: 2px 10px;
  border-radius: 999px;
}

.inbox-list {
  max-height: 380px;
  overflow-y: auto;
  border: 1px solid var(--card-border);
  border-radius: 14px;
  background: var(--field-bg);
  padding: 6px;
}
.inbox-list::-webkit-scrollbar { width: 8px; }
.inbox-list::-webkit-scrollbar-thumb { background: var(--card-border); border-radius: 8px; }

.empty-state { text-align: center; padding: 40px 16px; color: var(--text-dim); }
.empty-icon { font-size: 34px; margin-bottom: 8px; }
.empty-sub { font-size: 12px; margin-top: 4px; }

.msg-item {
  display: flex;
  flex-direction: column;
  gap: 3px;
  padding: 12px 14px;
  border-radius: 10px;
  cursor: pointer;
  border: 1px solid transparent;
}
.msg-item + .msg-item { margin-top: 4px; }
.msg-item:hover { background: rgba(108,123,255,.08); border-color: var(--card-border); }
.msg-item.new-arrival { animation: pop-in .5s ease; background: rgba(108,123,255,.14); }
@keyframes pop-in {
  0% { transform: translateY(-6px); opacity: 0; }
  100% { transform: translateY(0); opacity: 1; }
}
.msg-top { display: flex; justify-content: space-between; gap: 10px; font-size: 13px; }
.msg-from { font-weight: 700; color: var(--text); overflow: hidden; text-overflow: ellipsis; white-space: nowrap; }
.msg-time { color: var(--text-dim); white-space: nowrap; font-size: 12px; }
.msg-subject { font-size: 14px; color: var(--text); font-weight: 600; }
.msg-snippet { font-size: 12.5px; color: var(--text-dim); overflow: hidden; text-overflow: ellipsis; white-space: nowrap; }

.foot { text-align: center; color: var(--text-dim); font-size: 12px; margin-top: 18px; }

.overlay {
  position: fixed; inset: 0;
  background: rgba(5,6,15,.72);
  display: flex; align-items: center; justify-content: center;
  padding: 16px;
  z-index: 50;
}

.detail-panel {
  background: var(--card);
  border: 1px solid var(--card-border);
  border-radius: 16px;
  width: 100%;
  max-width: 640px;
  max-height: 85vh;
  display: flex;
  flex-direction: column;
  overflow: hidden;
}
.detail-header { padding: 12px; border-bottom: 1px solid var(--card-border); }
.detail-meta { padding: 14px 16px 6px; }
.detail-meta h3 { margin: 0 0 4px; font-size: 17px; }
.detail-from { margin: 0; color: var(--text-dim); font-size: 13px; }
.detail-frame {
  flex: 1;
  border: none;
  background: #fff;
  min-height: 300px;
  margin: 12px 16px 16px;
  border-radius: 10px;
}

.expired-panel {
  background: var(--card);
  border: 1px solid var(--card-border);
  border-radius: 16px;
  padding: 32px 24px;
  text-align: center;
  max-width: 360px;
}
.expired-icon { font-size: 40px; margin-bottom: 10px; }
.expired-panel h3 { margin: 0 0 8px; }
.expired-panel p { color: var(--text-dim); font-size: 14px; margin-bottom: 18px; }

@media (max-width: 480px) {
  .address-field { font-size: 14px; }
  .meta-row { flex-direction: column; align-items: stretch; }
  .meta-row .btn { width: 100%; }
}