/* ── Utility ── */
.hidden { display: none !important; }

/* ── Reset & Base ── */
*, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }

:root {
  --bg:       #0f0f13;
  --surface:  #1a1a24;
  --card:     #22223a;
  --border:   #2e2e48;
  --accent:   #6c63ff;
  --accent2:  #ff6584;
  --text:     #e0e0f0;
  --muted:    #8888aa;
  --success:  #4caf87;
  --danger:   #e05c5c;
  --radius:   10px;
  --shadow:   0 4px 24px rgba(0,0,0,0.4);
}

html { font-size: 15px; }
body {
  background: var(--bg);
  color: var(--text);
  font-family: 'Segoe UI', system-ui, -apple-system, sans-serif;
  min-height: 100vh;
  line-height: 1.55;
}

a { color: var(--accent); text-decoration: none; }
a:hover { text-decoration: underline; }
button { cursor: pointer; font-family: inherit; }
input, select { font-family: inherit; }

/* ── Scrollbar ── */
::-webkit-scrollbar { width: 6px; }
::-webkit-scrollbar-track { background: var(--surface); }
::-webkit-scrollbar-thumb { background: var(--border); border-radius: 3px; }

/* ── Nav ── */
nav {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 14px 32px;
  background: var(--surface);
  border-bottom: 1px solid var(--border);
  position: sticky;
  top: 0;
  z-index: 100;
}

.nav-logo {
  font-size: 1.25rem;
  font-weight: 700;
  color: var(--accent);
  letter-spacing: -0.5px;
}
.nav-logo span { color: var(--accent2); }

.nav-links { display: flex; gap: 12px; align-items: center; }

.btn {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  padding: 8px 18px;
  border-radius: var(--radius);
  border: none;
  font-size: 0.9rem;
  font-weight: 600;
  transition: opacity 0.15s, transform 0.1s;
}
.btn:hover { opacity: 0.88; transform: translateY(-1px); }
.btn:active { transform: translateY(0); }

.btn-primary { background: var(--accent);  color: #fff; }
.btn-ghost   { background: transparent; color: var(--text); border: 1px solid var(--border); }
.btn-danger  { background: var(--danger);  color: #fff; }
.btn-success { background: var(--success); color: #fff; }
.btn-sm { padding: 5px 12px; font-size: 0.82rem; }
.btn-xs { padding: 4px 10px; font-size: 0.76rem; }

/* ── Hero ── */
.hero {
  text-align: center;
  padding: 52px 20px 32px;
}
.hero h1 {
  font-size: 2rem;
  font-weight: 800;
  margin-bottom: 6px;
  background: linear-gradient(135deg, var(--accent), var(--accent2));
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}
.hero p { color: var(--muted); font-size: 1rem; }

/* ── Address box ── */
.address-card {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: 14px;
  padding: 28px 28px 22px;
  max-width: 700px;
  margin: 0 auto 28px;
  box-shadow: var(--shadow);
}

.addr-row {
  display: flex;
  gap: 10px;
  margin-bottom: 16px;
}
#addressDisplay {
  flex: 1;
  background: var(--card);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 13px 18px;
  font-size: 1.15rem;
  font-weight: 600;
  color: var(--accent);
  letter-spacing: 0.3px;
  overflow: hidden;
  text-overflow: ellipsis;
  white-space: nowrap;
}

.addr-controls {
  display: flex;
  align-items: center;
  flex-wrap: wrap;
  gap: 10px;
}

#domainSelect {
  background: var(--card);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  color: var(--text);
  padding: 8px 12px;
  font-size: 0.88rem;
}

.ttl-badge {
  margin-left: auto;
  font-size: 0.82rem;
  color: var(--muted);
}
#ttlTimer { color: var(--accent2); font-weight: 600; }

/* ── Inbox ── */
.inbox-wrapper {
  max-width: 700px;
  margin: 0 auto 60px;
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: 14px;
  overflow: hidden;
  box-shadow: var(--shadow);
}

.inbox-header {
  display: flex;
  align-items: center;
  gap: 12px;
  padding: 16px 22px;
  border-bottom: 1px solid var(--border);
  background: var(--card);
}
.inbox-header h3 { font-size: 1rem; font-weight: 700; }
.badge {
  background: var(--accent);
  color: #fff;
  font-size: 0.75rem;
  font-weight: 700;
  padding: 2px 8px;
  border-radius: 20px;
}
.badge-muted { background: var(--border); color: var(--muted); }

.refresh-btn {
  margin-left: auto;
  background: none;
  border: 1px solid var(--border);
  color: var(--muted);
  border-radius: 8px;
  padding: 5px 12px;
  font-size: 0.82rem;
  display: flex;
  align-items: center;
  gap: 6px;
}
.refresh-btn:hover { border-color: var(--accent); color: var(--accent); }
.spin { display: inline-block; animation: spin 0.8s linear infinite; }
@keyframes spin { to { transform: rotate(360deg); } }

/* ── Message list ── */
.msg-list { list-style: none; }
.msg-item {
  display: flex;
  align-items: center;
  gap: 14px;
  padding: 14px 22px;
  border-bottom: 1px solid var(--border);
  cursor: pointer;
  transition: background 0.12s;
}
.msg-item:last-child { border-bottom: none; }
.msg-item:hover { background: var(--card); }
.msg-item.unread .msg-subject { font-weight: 700; color: var(--text); }
.msg-item.unread .unread-dot { opacity: 1; }

.unread-dot {
  width: 8px; height: 8px;
  border-radius: 50%;
  background: var(--accent);
  flex-shrink: 0;
  opacity: 0;
}

.msg-meta { flex: 1; min-width: 0; }
.msg-from {
  font-size: 0.82rem;
  color: var(--muted);
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
}
.msg-subject {
  font-size: 0.95rem;
  color: var(--text);
  font-weight: 500;
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
}

.msg-time {
  font-size: 0.78rem;
  color: var(--muted);
  flex-shrink: 0;
}
.msg-del {
  opacity: 0;
  background: none;
  border: none;
  color: var(--danger);
  font-size: 1rem;
  padding: 4px 8px;
  border-radius: 6px;
  transition: opacity 0.15s, background 0.12s;
}
.msg-item:hover .msg-del { opacity: 1; }
.msg-del:hover { background: rgba(224,92,92,0.15); }

/* Empty state */
.empty-state {
  padding: 52px 20px;
  text-align: center;
  color: var(--muted);
}
.empty-state .icon { font-size: 2.5rem; margin-bottom: 12px; }
.empty-state p { font-size: 0.92rem; }

/* ── Message viewer ── */
.msg-viewer {
  position: fixed;
  inset: 0;
  background: rgba(0,0,0,0.6);
  z-index: 200;
  display: flex;
  align-items: center;
  justify-content: center;
  padding: 20px;
  animation: fadeIn 0.18s ease;
}
.msg-viewer.hidden { display: none; }
@keyframes fadeIn { from { opacity: 0; } to { opacity: 1; } }

.viewer-card {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: 14px;
  width: 100%;
  max-width: 760px;
  max-height: 88vh;
  display: flex;
  flex-direction: column;
  overflow: hidden;
  box-shadow: 0 8px 48px rgba(0,0,0,0.7);
  animation: slideUp 0.2s ease;
}
@keyframes slideUp { from { transform: translateY(20px); opacity:0; } to { transform:none; opacity:1; } }

.viewer-head {
  padding: 20px 24px 16px;
  border-bottom: 1px solid var(--border);
  background: var(--card);
}
.viewer-head h2 { font-size: 1.05rem; margin-bottom: 8px; }
.viewer-meta { font-size: 0.82rem; color: var(--muted); display: flex; flex-direction: column; gap: 3px; }
.viewer-meta span b { color: var(--text); }
.viewer-actions { display: flex; gap: 8px; margin-top: 14px; }

.viewer-body {
  flex: 1;
  overflow-y: auto;
  padding: 24px;
}
.viewer-html-frame {
  width: 100%;
  border: none;
  background: #fff;
  border-radius: 8px;
  min-height: 300px;
}
.viewer-text-body {
  white-space: pre-wrap;
  font-size: 0.9rem;
  line-height: 1.7;
  color: var(--text);
}

/* ── Modal (login/register) ── */
.modal-overlay {
  position: fixed;
  inset: 0;
  background: rgba(0,0,0,0.7);
  z-index: 300;
  display: flex;
  align-items: center;
  justify-content: center;
  padding: 20px;
  animation: fadeIn 0.18s ease;
}

.modal-card {
  position: relative;
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: 18px;
  padding: 32px 28px 28px;
  width: 100%;
  max-width: 400px;
  box-shadow: 0 20px 60px rgba(0,0,0,0.6);
  animation: slideUp 0.2s ease;
}

.modal-close {
  position: absolute;
  top: 14px;
  right: 16px;
  background: var(--card);
  border: 1px solid var(--border);
  color: var(--muted);
  width: 30px;
  height: 30px;
  border-radius: 50%;
  font-size: 0.85rem;
  display: flex;
  align-items: center;
  justify-content: center;
  line-height: 1;
  transition: color 0.15s, border-color 0.15s;
}
.modal-close:hover { color: var(--text); border-color: var(--muted); }

.modal-header { margin-bottom: 20px; padding-right: 32px; }
.modal-header h2 { font-size: 1.3rem; margin-bottom: 4px; }
.modal-header p  { color: var(--muted); font-size: 0.85rem; }

/* ── Tabs ── */
.tabs {
  display: flex;
  background: var(--card);
  border: 1px solid var(--border);
  border-radius: 10px;
  padding: 4px;
  margin-bottom: 22px;
  gap: 4px;
}
.tab {
  flex: 1;
  padding: 9px 0;
  text-align: center;
  font-weight: 600;
  font-size: 0.88rem;
  color: var(--muted);
  border: none;
  background: transparent;
  border-radius: 7px;
  transition: color 0.15s, background 0.15s;
}
.tab.active {
  background: var(--accent);
  color: #fff;
}
.tab:not(.active):hover { color: var(--text); }

/* ── Form fields ── */
.field { margin-bottom: 14px; }
.field label {
  display: block;
  font-size: 0.8rem;
  color: var(--muted);
  margin-bottom: 5px;
  font-weight: 500;
  letter-spacing: 0.3px;
  text-transform: uppercase;
}
.field input {
  width: 100%;
  background: var(--card);
  border: 1px solid var(--border);
  border-radius: 8px;
  color: var(--text);
  padding: 10px 13px;
  font-size: 0.93rem;
  transition: border-color 0.15s, box-shadow 0.15s;
}
.field input:focus {
  outline: none;
  border-color: var(--accent);
  box-shadow: 0 0 0 3px rgba(108,99,255,0.15);
}

.btn-full { width: 100%; justify-content: center; margin-top: 6px; padding: 11px; }

.modal-switch {
  text-align: center;
  font-size: 0.83rem;
  color: var(--muted);
  margin-top: 14px;
}
.modal-switch a { color: var(--accent); }

.form-error {
  background: rgba(224,92,92,0.1);
  border: 1px solid rgba(224,92,92,0.3);
  color: #f08080;
  border-radius: 8px;
  padding: 9px 13px;
  font-size: 0.85rem;
  margin-bottom: 14px;
}

/* ── Account page ── */
.page-container {
  max-width: 820px;
  margin: 48px auto;
  padding: 0 20px;
}
.page-container h1 { font-size: 1.7rem; margin-bottom: 6px; }
.page-container .sub { color: var(--muted); margin-bottom: 32px; font-size: 0.92rem; }

.hist-card {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: 12px;
  overflow: hidden;
  margin-bottom: 24px;
}
.hist-card-head {
  padding: 14px 20px;
  background: var(--card);
  border-bottom: 1px solid var(--border);
  font-weight: 700;
  font-size: 0.95rem;
}

.hist-row {
  display: flex;
  align-items: center;
  gap: 14px;
  padding: 13px 20px;
  border-bottom: 1px solid var(--border);
  font-size: 0.9rem;
}
.hist-row:last-child { border-bottom: none; }
.hist-addr { color: var(--accent); font-weight: 600; flex: 1; }
.hist-count { color: var(--muted); font-size: 0.82rem; }
.hist-exp   { font-size: 0.78rem; color: var(--muted); }
.hist-open  { margin-left: auto; }

/* ── Toast ── */
#toast {
  position: fixed;
  bottom: 24px;
  left: 50%;
  transform: translateX(-50%) translateY(80px);
  background: var(--card);
  border: 1px solid var(--border);
  color: var(--text);
  border-radius: 10px;
  padding: 12px 24px;
  font-size: 0.9rem;
  font-weight: 500;
  z-index: 999;
  transition: transform 0.28s cubic-bezier(.34,1.56,.64,1), opacity 0.2s;
  opacity: 0;
  pointer-events: none;
}
#toast.show { transform: translateX(-50%) translateY(0); opacity: 1; }
#toast.toast-ok     { border-color: var(--success); color: var(--success); }
#toast.toast-error  { border-color: var(--danger);  color: var(--danger); }

/* ── Responsive ── */
@media (max-width: 600px) {
  nav { padding: 12px 16px; }
  .hero { padding: 32px 14px 20px; }
  .hero h1 { font-size: 1.5rem; }
  .address-card, .inbox-wrapper { border-radius: 10px; }
  .addr-row { flex-direction: column; }
  .modal-card { padding: 24px 18px; }
}