:root {
  --bg: #f5f6f8;
  --card: #ffffff;
  --ink: #1f2733;
  --muted: #5b6675;
  --line: #d9dee6;
  --brand: #2a5d8f;
  --brand-dark: #1f4a73;
  --danger: #b3261e;
  --ok: #1d7a4d;
  --warn-bg: #fff4d6;
  --warn-ink: #6b4e00;
  --radius: 10px;
  --maxw: 760px;
}

* { box-sizing: border-box; }

body {
  margin: 0;
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", "PingFang TC", "Microsoft JhengHei", "Noto Sans TC", sans-serif;
  color: var(--ink);
  background: var(--bg);
  line-height: 1.6;
}

body.admin { --maxw: 1080px; background: #eef1f5; }

a { color: var(--brand); }

.site-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 1rem;
  padding: 0.85rem 1.25rem;
  background: var(--brand);
  color: #fff;
  flex-wrap: wrap;
}
.site-header .brand { color: #fff; font-weight: 700; text-decoration: none; font-size: 1.05rem; }
.top-nav { display: flex; align-items: center; gap: 1rem; flex-wrap: wrap; }
.top-nav a { color: #eaf2fb; text-decoration: none; font-size: 0.95rem; }
.top-nav a:hover { text-decoration: underline; }
.lang { margin-left: 0.5rem; }
.lang a { padding: 0.1rem 0.4rem; border-radius: 6px; }
.lang a.on { background: rgba(255,255,255,0.25); font-weight: 700; }

.container {
  max-width: var(--maxw);
  margin: 1.5rem auto;
  padding: 0 1.25rem;
}

h1 { font-size: 1.5rem; margin: 0.2rem 0 0.6rem; }
h2 { font-size: 1.15rem; margin: 1.6rem 0 0.5rem; }

.intro p { color: var(--muted); }
.intro .anon {
  background: var(--card);
  border: 1px solid var(--line);
  border-radius: var(--radius);
  padding: 0.75rem 1rem;
  margin-top: 1rem;
}
.intro .anon summary { cursor: pointer; font-weight: 600; }
.intro .anon ul { margin: 0.6rem 0 0.2rem; padding-left: 1.2rem; color: var(--muted); }

form { background: var(--card); border: 1px solid var(--line); border-radius: var(--radius); padding: 1.25rem; margin-top: 1rem; }
.lookup form, .reply-form, .logout-form, .filter, .add-recipient, .admin-controls form { margin-top: 1rem; }

.field { margin-bottom: 1.1rem; }
.field > label { display: block; font-weight: 600; margin-bottom: 0.3rem; }
.hint { margin: 0.1rem 0 0.45rem; color: var(--muted); font-size: 0.9rem; }
.req { color: var(--danger); font-weight: 600; font-size: 0.8rem; }
.opt { color: var(--muted); font-weight: 400; font-size: 0.8rem; }

input[type=text], input[type=email], select, textarea {
  width: 100%;
  padding: 0.6rem 0.7rem;
  border: 1px solid var(--line);
  border-radius: 8px;
  font: inherit;
  color: var(--ink);
  background: #fff;
}
textarea { resize: vertical; }
input:focus, select:focus, textarea:focus { outline: 2px solid var(--brand); border-color: var(--brand); }

.grid-2 { display: grid; grid-template-columns: 1fr 1fr; gap: 1rem; }
@media (max-width: 560px) { .grid-2 { grid-template-columns: 1fr; } }

.file-list { margin-top: 0.5rem; font-size: 0.9rem; color: var(--muted); }
.file-list div { padding: 0.15rem 0; }

button, .button {
  display: inline-block;
  background: var(--brand);
  color: #fff;
  border: none;
  border-radius: 8px;
  padding: 0.6rem 1.1rem;
  font: inherit;
  font-weight: 600;
  cursor: pointer;
  text-decoration: none;
}
button:hover, .button:hover { background: var(--brand-dark); }
button:disabled { opacity: 0.6; cursor: default; }
button.secondary { background: #e7ebf1; color: var(--ink); }
button.secondary:hover { background: #dde3eb; }
button.danger { background: var(--danger); }
button.danger:hover { background: #8f1e17; }
.actions { display: flex; gap: 0.6rem; align-items: center; flex-wrap: wrap; margin-top: 0.5rem; }

.errors { background: #fde8e6; border: 1px solid #f3b4ae; color: var(--danger); border-radius: 8px; padding: 0.6rem 1rem; margin: 1rem 0; }
.errors ul { margin: 0; padding-left: 1.1rem; }

/* 完成頁 */
.submitted .warn { background: var(--warn-bg); color: var(--warn-ink); border-radius: 8px; padding: 0.8rem 1rem; margin: 0.8rem 0; font-weight: 600; }
.credentials { display: grid; gap: 0.8rem; margin: 1rem 0; }
.cred { display: flex; align-items: center; gap: 0.75rem; background: var(--card); border: 1px solid var(--line); border-radius: 8px; padding: 0.8rem 1rem; flex-wrap: wrap; }
.cred-label { min-width: 4.5rem; color: var(--muted); font-size: 0.85rem; }
.cred-value { font-size: 1.4rem; font-weight: 700; letter-spacing: 0.08em; font-family: ui-monospace, "SFMono-Regular", Menlo, monospace; }
.copy-btn { margin-left: auto; }
.note { color: var(--muted); font-size: 0.9rem; }

/* 對話 */
.thread { display: flex; flex-direction: column; gap: 0.6rem; margin: 0.5rem 0 1rem; }
.msg { border: 1px solid var(--line); border-radius: 10px; padding: 0.6rem 0.85rem; max-width: 85%; }
.msg .msg-meta { font-size: 0.78rem; color: var(--muted); margin-bottom: 0.25rem; }
.msg.from-admin { background: #eaf2fb; align-self: flex-start; }
.msg.from-you { background: #eef7f0; align-self: flex-end; }
.report-body { background: var(--card); border: 1px solid var(--line); border-radius: 8px; padding: 0.8rem 1rem; white-space: normal; }
.muted { color: var(--muted); }

.case-header { display: flex; align-items: center; gap: 0.8rem; flex-wrap: wrap; }
dl.meta { display: grid; grid-template-columns: auto 1fr; gap: 0.2rem 1rem; background: var(--card); border: 1px solid var(--line); border-radius: 8px; padding: 0.7rem 1rem; }
dl.meta dt { color: var(--muted); }
dl.meta dd { margin: 0; }

.attach-list { padding-left: 1.1rem; }

/* 狀態徽章 */
.status { display: inline-block; padding: 0.15rem 0.6rem; border-radius: 999px; font-size: 0.82rem; font-weight: 600; }
.status-new { background: #fde8e6; color: var(--danger); }
.status-in_review { background: #fff4d6; color: var(--warn-ink); }
.status-responded { background: #e6f0fb; color: var(--brand-dark); }
.status-closed { background: #e7ebf1; color: var(--muted); }

/* 後台 */
.admin-bar { display: flex; justify-content: space-between; align-items: center; flex-wrap: wrap; gap: 0.5rem; }
.admin-nav { display: flex; gap: 1rem; }
.chips { display: flex; gap: 0.5rem; flex-wrap: wrap; margin: 0.8rem 0; }
.chip { background: var(--card); border: 1px solid var(--line); border-radius: 999px; padding: 0.3rem 0.8rem; text-decoration: none; color: var(--ink); font-size: 0.9rem; }
.chip.on { background: var(--brand); color: #fff; border-color: var(--brand); }
.chip b { font-weight: 700; }
.filter { background: transparent; border: none; padding: 0; }
table.cases { width: 100%; border-collapse: collapse; background: var(--card); border: 1px solid var(--line); border-radius: var(--radius); overflow: hidden; }
table.cases th, table.cases td { text-align: left; padding: 0.6rem 0.8rem; border-bottom: 1px solid var(--line); font-size: 0.92rem; }
table.cases th { background: #f0f3f7; }
table.cases tr:last-child td { border-bottom: none; }
.inline { display: inline; background: none; border: none; padding: 0; margin: 0; }
.admin-controls { display: flex; gap: 1.5rem; flex-wrap: wrap; margin-top: 1.5rem; padding-top: 1rem; border-top: 1px solid var(--line); }
.add-recipient { display: flex; gap: 0.6rem; flex-wrap: wrap; align-items: center; }
.add-recipient input { width: auto; flex: 1 1 200px; }

.site-footer { max-width: var(--maxw); margin: 2rem auto; padding: 1rem 1.25rem; color: var(--muted); font-size: 0.85rem; border-top: 1px solid var(--line); }

@media print {
  .site-header, .site-footer, .actions, .top-nav { display: none; }
}