:root {
  --bg: #0f1115;
  --bg-card: #171a21;
  --border: #262b35;
  --text: #e8eaed;
  --text-dim: #9aa1ac;
  --accent: #6c8cff;
  --accent-dim: #3d4d8f;
  --danger: #ff6c6c;
  --radius: 12px;
}

@media (prefers-color-scheme: light) {
  :root {
    --bg: #f5f6f8;
    --bg-card: #ffffff;
    --border: #e2e4e9;
    --text: #16181d;
    --text-dim: #5b6270;
    --accent: #3557e0;
    --accent-dim: #dbe2ff;
  }
}

* { 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);
  min-height: 100vh;
  display: flex;
  flex-direction: column;
}

.topbar {
  text-align: center;
  padding: 2.5rem 1rem 1.5rem;
}

.brand {
  font-size: 1.9rem;
  font-weight: 800;
  letter-spacing: -0.02em;
}
.brand span { color: var(--accent); }

.tagline {
  color: var(--text-dim);
  margin: 0.4rem 0 0;
}

.container {
  width: 100%;
  max-width: 640px;
  margin: 0 auto;
  padding: 0 1rem 2rem;
  flex: 1;
}

.address-card, .inbox-card {
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 1.25rem;
  margin-bottom: 1.25rem;
}

.label {
  display: block;
  font-size: 0.8rem;
  color: var(--text-dim);
  margin-bottom: 0.4rem;
}

.address-row {
  display: flex;
  gap: 0.5rem;
}

.address-input {
  flex: 1;
  min-width: 0;
  font-size: 1.05rem;
  font-weight: 600;
  padding: 0.7rem 0.8rem;
  border-radius: 8px;
  border: 1px solid var(--border);
  background: var(--bg);
  color: var(--text);
}

.btn {
  cursor: pointer;
  border: 1px solid var(--border);
  background: var(--bg);
  color: var(--text);
  padding: 0.7rem 1rem;
  border-radius: 8px;
  font-size: 0.9rem;
  font-weight: 600;
  transition: opacity 0.15s ease;
}
.btn:hover { opacity: 0.85; }
.btn:active { opacity: 0.65; }

.btn-primary {
  background: var(--accent);
  border-color: var(--accent);
  color: #fff;
}

.btn-ghost {
  background: transparent;
}

.btn-secondary {
  background: var(--accent-dim);
  border-color: var(--accent-dim);
}

.domain-row {
  margin-top: 0.9rem;
}

.domain-select {
  width: 100%;
  padding: 0.6rem 0.7rem;
  border-radius: 8px;
  border: 1px solid var(--border);
  background: var(--bg);
  color: var(--text);
  font-size: 0.92rem;
}

.actions {
  display: flex;
  gap: 0.6rem;
  margin-top: 0.8rem;
}

.custom-panel {
  margin-top: 1rem;
  color: var(--text-dim);
  font-size: 0.85rem;
}
.custom-panel summary { cursor: pointer; }

.custom-row {
  display: flex;
  align-items: center;
  gap: 0.4rem;
  margin-top: 0.6rem;
  flex-wrap: wrap;
}

.custom-row input {
  flex: 1;
  min-width: 120px;
  padding: 0.55rem 0.7rem;
  border-radius: 8px;
  border: 1px solid var(--border);
  background: var(--bg);
  color: var(--text);
}

.domain-suffix {
  color: var(--text-dim);
  font-size: 0.85rem;
}

.inbox-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  margin-bottom: 0.8rem;
}

.inbox-header h2 {
  font-size: 1.05rem;
  margin: 0;
}

.status {
  font-size: 0.78rem;
  color: var(--text-dim);
}

.inbox-list {
  list-style: none;
  margin: 0;
  padding: 0;
  display: flex;
  flex-direction: column;
  gap: 0.5rem;
}

.inbox-item {
  border: 1px solid var(--border);
  border-radius: 8px;
  padding: 0.7rem 0.9rem;
  cursor: pointer;
  display: flex;
  flex-direction: column;
  gap: 0.15rem;
  transition: background 0.15s ease;
}
.inbox-item:hover { background: var(--accent-dim); }

.inbox-item .from {
  font-size: 0.8rem;
  color: var(--text-dim);
}

.inbox-item .subject {
  font-weight: 600;
}

.inbox-item .time {
  font-size: 0.75rem;
  color: var(--text-dim);
}

.empty-state {
  color: var(--text-dim);
  font-size: 0.88rem;
  padding: 1.5rem 0.5rem;
  text-align: center;
}

.footer {
  text-align: center;
  color: var(--text-dim);
  font-size: 0.78rem;
  padding: 1rem;
}

.modal {
  position: fixed;
  inset: 0;
  background: rgba(0, 0, 0, 0.55);
  display: flex;
  align-items: center;
  justify-content: center;
  padding: 1rem;
  z-index: 50;
}
.modal.hidden { display: none; }

.modal-content {
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  width: 100%;
  max-width: 680px;
  max-height: 85vh;
  display: flex;
  flex-direction: column;
  position: relative;
  overflow: hidden;
}

.modal-close {
  position: absolute;
  top: 0.6rem;
  right: 0.8rem;
  background: none;
  border: none;
  color: var(--text-dim);
  font-size: 1.4rem;
  cursor: pointer;
  line-height: 1;
}

.modal-header {
  padding: 1.2rem 1.2rem 0.8rem;
  border-bottom: 1px solid var(--border);
}
.modal-header h3 { margin: 0 0 0.3rem; font-size: 1.05rem; padding-right: 1.5rem; }
.modal-from, .modal-date { margin: 0.1rem 0; color: var(--text-dim); font-size: 0.82rem; }

.modal-body {
  flex: 1;
  overflow: auto;
  padding: 0;
}

.modal-frame {
  width: 100%;
  height: 55vh;
  border: none;
  background: #fff;
}
.modal-frame.hidden { display: none; }

.modal-text {
  white-space: pre-wrap;
  word-break: break-word;
  padding: 1rem 1.2rem;
  margin: 0;
  font-family: inherit;
  font-size: 0.9rem;
}
.modal-text.hidden { display: none; }