:root {
  --ink:        #192220;
  --ink-soft:   #5A6360;
  --paper:      #EFF1ED;
  --surface:    #FBFCFA;
  --accent:     #17B3A6;
  --accent-deep:#0C7D74;
  --accent-tint:#DEF4F1;
  --danger:     #C0392B;
  --line:       #D8DBD5;
  --sidebar-bg: #192220;
  --sidebar-w:  220px;
  --body:       'Inter', sans-serif;
  --mono:       'JetBrains Mono', monospace;
  --disp:       'Zilla Slab', serif;
}

*, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }

body {
  font-family: var(--body);
  font-size: 14px;
  color: var(--ink);
  background: var(--paper);
  min-height: 100vh;
}

a { color: inherit; text-decoration: none; }

/* ── Auth ─────────────────────────────────────────────────────────────────── */
.auth-wrap {
  min-height: 100vh;
  display: flex;
  align-items: center;
  justify-content: center;
  background: var(--paper);
}

.auth-card {
  background: var(--surface);
  border: 1px solid var(--line);
  border-radius: 10px;
  padding: 40px 36px;
  width: 100%;
  max-width: 380px;
}

.auth-logo {
  display: flex;
  align-items: center;
  gap: 10px;
  font-family: var(--disp);
  font-size: 17px;
  font-weight: 600;
  margin-bottom: 28px;
}

.auth-card h1 {
  font-family: var(--disp);
  font-size: 22px;
  margin-bottom: 20px;
}

.auth-hint {
  color: var(--ink-soft);
  margin-bottom: 20px;
  line-height: 1.5;
  font-size: 13px;
}

.auth-error {
  background: #FFF0EE;
  border: 1px solid #F5C6C0;
  color: var(--danger);
  padding: 10px 14px;
  border-radius: 6px;
  margin-bottom: 16px;
  font-size: 13px;
}

.auth-card form { display: flex; flex-direction: column; gap: 14px; }

.auth-card label {
  display: flex;
  flex-direction: column;
  gap: 5px;
  font-size: 12px;
  font-family: var(--mono);
  color: var(--ink-soft);
  text-transform: uppercase;
  letter-spacing: .04em;
}

.auth-card input[type="password"] {
  padding: 10px 12px;
  border: 1px solid var(--line);
  border-radius: 6px;
  font-size: 14px;
  font-family: var(--body);
  background: var(--paper);
  color: var(--ink);
  outline: none;
  transition: border-color .15s;
}
.auth-card input:focus { border-color: var(--accent); }

/* ── Layout ───────────────────────────────────────────────────────────────── */
.layout {
  display: grid;
  grid-template-columns: var(--sidebar-w) 1fr;
  min-height: 100vh;
}

.sidebar {
  background: var(--sidebar-bg);
  display: flex;
  flex-direction: column;
  padding: 0;
  position: sticky;
  top: 0;
  height: 100vh;
}

.sidebar-logo {
  display: flex;
  align-items: center;
  gap: 10px;
  padding: 20px 18px;
  font-family: var(--disp);
  font-size: 15px;
  color: var(--paper);
  border-bottom: 1px solid rgba(255,255,255,.08);
}

.sidebar-nav {
  flex: 1;
  padding: 12px 10px;
  display: flex;
  flex-direction: column;
  gap: 2px;
}

.nav-item {
  display: flex;
  align-items: center;
  gap: 9px;
  padding: 9px 10px;
  border-radius: 6px;
  color: rgba(255,255,255,.6);
  font-size: 13px;
  font-weight: 500;
  transition: background .15s, color .15s;
}
.nav-item:hover { background: rgba(255,255,255,.07); color: #fff; }
.nav-item.active { background: var(--accent); color: #fff; }

.badge {
  margin-left: auto;
  background: rgba(255,255,255,.2);
  font-family: var(--mono);
  font-size: 11px;
  padding: 1px 6px;
  border-radius: 10px;
  min-width: 20px;
  text-align: center;
}
.nav-item.active .badge { background: rgba(0,0,0,.2); }

.sidebar-footer {
  padding: 14px 10px;
  border-top: 1px solid rgba(255,255,255,.08);
}

.logout-btn {
  width: 100%;
  padding: 8px;
  background: transparent;
  border: 1px solid rgba(255,255,255,.15);
  border-radius: 6px;
  color: rgba(255,255,255,.5);
  font-size: 12px;
  font-family: var(--mono);
  cursor: pointer;
  transition: background .15s, color .15s;
}
.logout-btn:hover { background: rgba(255,255,255,.07); color: rgba(255,255,255,.8); }

.main {
  display: flex;
  flex-direction: column;
  min-height: 100vh;
  background: var(--paper);
}

/* ── Buttons ──────────────────────────────────────────────────────────────── */
.btn-primary {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  padding: 8px 18px;
  background: var(--accent);
  color: #fff;
  border: none;
  border-radius: 6px;
  font-size: 13px;
  font-weight: 500;
  cursor: pointer;
  transition: background .15s;
  text-decoration: none;
}
.btn-primary:hover { background: var(--accent-deep); }

.btn-ghost {
  display: inline-flex;
  align-items: center;
  padding: 8px 14px;
  background: transparent;
  color: var(--ink-soft);
  border: 1px solid var(--line);
  border-radius: 6px;
  font-size: 13px;
  font-weight: 500;
  cursor: pointer;
  transition: background .15s, color .15s;
  text-decoration: none;
}
.btn-ghost:hover { background: var(--surface); color: var(--ink); }
.btn-ghost.btn-danger { color: var(--danger); border-color: #F5C6C0; }
.btn-ghost.btn-danger:hover { background: #FFF0EE; }

/* ── Email header + folder tabs ───────────────────────────────────────────── */
.email-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 16px 24px;
  border-bottom: 1px solid var(--line);
  background: var(--surface);
  gap: 16px;
}

.folder-tabs {
  display: flex;
  gap: 2px;
}

.tab {
  padding: 6px 14px;
  border-radius: 6px;
  font-size: 13px;
  color: var(--ink-soft);
  transition: background .15s, color .15s;
}
.tab:hover { background: var(--paper); color: var(--ink); }
.tab.active { background: var(--accent-tint); color: var(--accent-deep); font-weight: 500; }

/* ── Thread list ──────────────────────────────────────────────────────────── */
.thread-list { flex: 1; }

.thread-row {
  display: grid;
  grid-template-columns: 220px 1fr auto;
  align-items: center;
  gap: 12px;
  padding: 14px 24px;
  border-bottom: 1px solid var(--line);
  transition: background .1s;
}
.thread-row:hover { background: var(--surface); }

.thread-from {
  font-size: 13px;
  font-weight: 500;
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
  color: var(--ink);
}

.thread-subject {
  font-size: 13px;
  color: var(--ink-soft);
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
  display: flex;
  align-items: center;
  gap: 8px;
}

.thread-row.unread .thread-from,
.thread-row.unread .thread-subject { color: var(--ink); font-weight: 600; }

.thread-count {
  font-family: var(--mono);
  font-size: 11px;
  color: var(--ink-soft);
  background: var(--paper);
  border: 1px solid var(--line);
  border-radius: 10px;
  padding: 1px 7px;
  flex-shrink: 0;
}

.thread-date {
  font-family: var(--mono);
  font-size: 11px;
  color: var(--ink-soft);
  white-space: nowrap;
}

.empty-state {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 12px;
  padding: 80px 24px;
  color: var(--ink-soft);
  font-size: 13px;
}

/* ── Thread view ──────────────────────────────────────────────────────────── */
.thread-toolbar {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 12px 24px;
  border-bottom: 1px solid var(--line);
  background: var(--surface);
  gap: 12px;
}

.back-link {
  font-size: 13px;
  color: var(--ink-soft);
  transition: color .15s;
}
.back-link:hover { color: var(--ink); }

.thread-actions { display: flex; gap: 8px; }

.thread-subject-heading {
  font-family: var(--disp);
  font-size: 20px;
  padding: 20px 24px 12px;
  border-bottom: 1px solid var(--line);
}

.message-list {
  display: flex;
  flex-direction: column;
  gap: 1px;
}

.message {
  padding: 20px 24px;
  border-bottom: 1px solid var(--line);
}
.message.outbound { background: var(--accent-tint); }

.msg-meta {
  display: flex;
  align-items: baseline;
  gap: 10px;
  margin-bottom: 12px;
  flex-wrap: wrap;
}

.msg-from { font-weight: 600; font-size: 13px; }
.msg-to   { font-size: 12px; color: var(--ink-soft); }
.msg-date { font-family: var(--mono); font-size: 11px; color: var(--ink-soft); margin-left: auto; }

.text-body {
  font-family: var(--mono);
  font-size: 13px;
  line-height: 1.65;
  white-space: pre-wrap;
  color: var(--ink);
}

.html-frame {
  width: 100%;
  border: none;
  min-height: 100px;
  display: block;
}

.reply-box {
  display: flex;
  align-items: center;
  gap: 10px;
  padding: 20px 24px;
  border-top: 1px solid var(--line);
  background: var(--surface);
}

/* ── Compose ──────────────────────────────────────────────────────────────── */
.compose-wrap { flex: 1; display: flex; flex-direction: column; }

.compose-heading {
  font-family: var(--disp);
  font-size: 20px;
  padding: 20px 24px 16px;
  border-bottom: 1px solid var(--line);
}

.compose-form {
  display: flex;
  flex-direction: column;
  gap: 0;
  flex: 1;
}

.field {
  display: flex;
  flex-direction: column;
  border-bottom: 1px solid var(--line);
}

.field label {
  padding: 10px 24px 0;
  font-family: var(--mono);
  font-size: 10px;
  text-transform: uppercase;
  letter-spacing: .06em;
  color: var(--ink-soft);
}

.field input,
.field textarea {
  padding: 8px 24px 12px;
  border: none;
  background: transparent;
  font-size: 14px;
  font-family: var(--body);
  color: var(--ink);
  outline: none;
  width: 100%;
}

.field-body { flex: 1; }
.field-body textarea { resize: none; flex: 1; min-height: 300px; }

.compose-footer {
  display: flex;
  align-items: center;
  gap: 10px;
  padding: 16px 24px;
  border-top: 1px solid var(--line);
  background: var(--surface);
}

.compose-from {
  margin-left: auto;
  font-size: 12px;
  color: var(--ink-soft);
  font-family: var(--mono);
}