:root {
    --bg: #f4f6fb;
    --card: #ffffff;
    --line: #e5e9f2;
    --text: #1f2937;
    --muted: #6b7280;
    --primary: #4f46e5;
    --primary-dark: #4338ca;
    --ok: #16a34a;
    --ok-bg: #ecfdf3;
    --warn: #b45309;
    --warn-bg: #fffbeb;
    --danger: #dc2626;
    --danger-bg: #fef2f2;
    --info: #0369a1;
    --info-bg: #f0f9ff;
    --sidebar: #111827;
    --sidebar-2: #1f2937;
    --radius: 12px;
    --shadow: 0 1px 2px rgba(16, 24, 40, .04), 0 8px 24px rgba(16, 24, 40, .04);
}

* { box-sizing: border-box; }

html, body {
    margin: 0;
    padding: 0;
}

body {
    background: var(--bg);
    color: var(--text);
    font: 14px/1.6 -apple-system, BlinkMacSystemFont, "Segoe UI", "PingFang SC", "Microsoft YaHei", sans-serif;
    -webkit-font-smoothing: antialiased;
}

a { color: var(--primary); text-decoration: none; }
a:hover { text-decoration: underline; }

code {
    font-family: ui-monospace, SFMono-Regular, Consolas, "Liberation Mono", monospace;
    font-size: 12px;
    background: #f3f4f6;
    border: 1px solid var(--line);
    border-radius: 6px;
    padding: 1px 5px;
    word-break: break-all;
}

pre.code {
    background: #0f172a;
    color: #e2e8f0;
    padding: 16px 18px;
    border-radius: var(--radius);
    overflow: auto;
    font-size: 12px;
    line-height: 1.7;
    border: 1px solid #1e293b;
}

pre.code code {
    background: none;
    border: 0;
    padding: 0;
    color: inherit;
}

/* ---------- 布局 ---------- */
.shell { display: flex; min-height: 100vh; }

.sidebar {
    width: 216px;
    flex: 0 0 216px;
    background: var(--sidebar);
    color: #e5e7eb;
    display: flex;
    flex-direction: column;
    position: sticky;
    top: 0;
    height: 100vh;
}

.brand {
    display: flex;
    align-items: center;
    gap: 10px;
    padding: 22px 20px 18px;
}

.brand-mark {
    width: 34px;
    height: 34px;
    border-radius: 10px;
    background: linear-gradient(135deg, #6366f1, #a855f7);
    color: #fff;
    font-weight: 700;
    display: inline-flex;
    align-items: center;
    justify-content: center;
    font-size: 17px;
    flex: 0 0 auto;
}

.brand strong { display: block; font-size: 15px; color: #f9fafb; letter-spacing: .3px; }
.brand small { display: block; font-size: 11px; color: #9ca3af; }

.nav { padding: 8px 12px; display: flex; flex-direction: column; gap: 2px; }

.nav-item {
    color: #cbd5e1;
    padding: 9px 12px;
    border-radius: 8px;
    font-size: 13.5px;
    transition: background .15s, color .15s;
}

.nav-item:hover { background: rgba(255, 255, 255, .06); color: #fff; text-decoration: none; }
.nav-item.active { background: rgba(99, 102, 241, .22); color: #fff; font-weight: 600; }

.sidebar-foot {
    margin-top: auto;
    padding: 16px 20px 20px;
    border-top: 1px solid rgba(255, 255, 255, .08);
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: 8px;
}

.sidebar-foot .me { font-size: 12.5px; color: #9ca3af; overflow: hidden; text-overflow: ellipsis; }
.link-btn {
    background: none;
    border: 0;
    color: #cbd5e1;
    font-size: 12.5px;
    cursor: pointer;
    padding: 0;
}
.link-btn:hover { color: #fff; }

.main {
    flex: 1;
    min-width: 0;
    padding: 26px 30px 60px;
}

.topbar {
    display: flex;
    align-items: baseline;
    justify-content: space-between;
    gap: 12px;
    margin-bottom: 20px;
}

.topbar h1 { font-size: 20px; margin: 0; letter-spacing: .2px; }
.topbar-sub { color: var(--muted); font-size: 12px; }

/* ---------- 卡片 ---------- */
.card {
    background: var(--card);
    border: 1px solid var(--line);
    border-radius: var(--radius);
    box-shadow: var(--shadow);
    padding: 18px 20px;
    margin-bottom: 18px;
}

.card.narrow { max-width: 460px; }

.card-head {
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: 12px;
    margin-bottom: 14px;
    flex-wrap: wrap;
}

.card-head h2 { font-size: 15px; margin: 0; }

/* ---------- 统计 ---------- */
.stats {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(150px, 1fr));
    gap: 14px;
    margin-bottom: 18px;
}

.stat {
    background: var(--card);
    border: 1px solid var(--line);
    border-radius: var(--radius);
    box-shadow: var(--shadow);
    padding: 15px 16px;
}

.stat span { display: block; color: var(--muted); font-size: 12px; }
.stat strong { display: block; font-size: 24px; line-height: 1.4; letter-spacing: .3px; }
.stat small { color: var(--muted); font-size: 11.5px; }
.text-ok { color: var(--ok); font-size: 20px !important; }

/* ---------- 表格 ---------- */
.table-wrap { overflow-x: auto; }

.table {
    width: 100%;
    border-collapse: collapse;
    font-size: 13px;
}

.table th {
    text-align: left;
    color: var(--muted);
    font-weight: 600;
    font-size: 12px;
    padding: 8px 10px;
    border-bottom: 1px solid var(--line);
    white-space: nowrap;
}

.table td {
    padding: 11px 10px;
    border-bottom: 1px solid #f1f3f9;
    vertical-align: top;
}

.table tr:last-child td { border-bottom: 0; }
.table tr:hover td { background: #fafbff; }

.content-cell { max-width: 420px; word-break: break-word; }
.nowrap { white-space: nowrap; }
.sub { margin-top: 4px; font-size: 12px; color: var(--muted); }
.error-text { color: var(--danger); }

/* ---------- 徽标 ---------- */
.badge {
    display: inline-flex;
    align-items: center;
    padding: 1px 8px;
    border-radius: 999px;
    font-size: 11.5px;
    border: 1px solid transparent;
    white-space: nowrap;
    background: #f3f4f6;
    color: #4b5563;
}
.badge.ok { background: var(--ok-bg); color: var(--ok); border-color: #bbf7d0; }
.badge.warn { background: var(--warn-bg); color: var(--warn); border-color: #fde68a; }
.badge.danger { background: var(--danger-bg); color: var(--danger); border-color: #fecaca; }
.badge.info { background: var(--info-bg); color: var(--info); border-color: #bae6fd; }
.badge.muted { background: #f3f4f6; color: #6b7280; border-color: #e5e7eb; }

/* ---------- 按钮 ---------- */
.btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: 6px;
    padding: 7px 13px;
    border-radius: 8px;
    border: 1px solid var(--line);
    background: #fff;
    color: #374151;
    font-size: 13px;
    cursor: pointer;
    line-height: 1.4;
    text-decoration: none;
    transition: background .15s, border-color .15s, color .15s;
    font-family: inherit;
}
.btn:hover { background: #f8fafc; border-color: #d5dbe8; text-decoration: none; }
.btn.primary { background: var(--primary); border-color: var(--primary); color: #fff; }
.btn.primary:hover { background: var(--primary-dark); border-color: var(--primary-dark); }
.btn.danger { color: var(--danger); border-color: #fecaca; background: #fff; }
.btn.danger:hover { background: var(--danger-bg); }
.btn.small { padding: 5px 11px; font-size: 12.5px; }
.btn.tiny { padding: 3px 9px; font-size: 12px; border-radius: 6px; }
.btn.block { width: 100%; }

.row-actions { display: flex; align-items: center; gap: 6px; flex-wrap: wrap; }
.row-actions form { margin: 0; }
.inline-form { display: flex; align-items: center; gap: 8px; flex-wrap: wrap; margin: 0; }
form.inline { display: inline; margin: 0; }

/* ---------- 表单 ---------- */
.stack { display: flex; flex-direction: column; gap: 13px; }
.stack.mt { margin-top: 16px; }

.form-grid { display: flex; flex-direction: column; gap: 14px; }
.grid-2 { display: grid; grid-template-columns: 1fr 1fr; gap: 14px; }

.field { display: flex; flex-direction: column; gap: 5px; }
.field > span { font-size: 12.5px; color: #374151; font-weight: 600; }
.field small { color: var(--muted); font-size: 11.5px; }

input[type="text"], input[type="password"], input[type="number"], select, textarea {
    width: 100%;
    padding: 8px 11px;
    border: 1px solid var(--line);
    border-radius: 8px;
    font: inherit;
    font-size: 13px;
    color: var(--text);
    background: #fff;
    outline: none;
    transition: border-color .15s, box-shadow .15s;
}

textarea { resize: vertical; line-height: 1.65; }

input:focus, select:focus, textarea:focus {
    border-color: #a5b4fc;
    box-shadow: 0 0 0 3px rgba(99, 102, 241, .12);
}

.checks { flex-direction: row; gap: 18px; flex-wrap: wrap; }
.check { display: inline-flex; align-items: center; gap: 7px; font-size: 13px; color: #374151; cursor: pointer; }
.check input { width: 15px; height: 15px; accent-color: var(--primary); }
.check.small { font-size: 12px; }

.form-actions { display: flex; gap: 10px; padding-top: 2px; }

.hint { color: var(--muted); font-size: 12.5px; margin: 10px 0 0; line-height: 1.7; }
.muted { color: var(--muted); }

/* ---------- 提示 ---------- */
.alert {
    border-radius: 10px;
    padding: 10px 14px;
    font-size: 13px;
    margin-bottom: 14px;
    border: 1px solid var(--line);
    background: #f8fafc;
    transition: opacity .4s;
}
.alert.ok { background: var(--ok-bg); color: #166534; border-color: #bbf7d0; }
.alert.error { background: var(--danger-bg); color: #991b1b; border-color: #fecaca; }
.alert.warning { background: var(--warn-bg); color: #92400e; border-color: #fde68a; }
.alert.info { background: var(--info-bg); color: #075985; border-color: #bae6fd; }
.alert.fade { opacity: 0; }

.empty { text-align: center; padding: 34px 12px; color: var(--muted); }
.empty p { margin: 0 0 14px; }

.copy-line {
    display: flex;
    align-items: center;
    gap: 8px;
    flex-wrap: wrap;
}
.copy-line code { max-width: 100%; }
.copy-line.compact { gap: 6px; margin-top: 4px; }

/* ---------- 登录 ---------- */
.auth-body {
    min-height: 100vh;
    display: flex;
    align-items: center;
    justify-content: center;
    background: radial-gradient(1200px 600px at 10% 0%, #eef2ff 0%, #f4f6fb 45%, #f4f6fb 100%);
    padding: 30px 16px;
}

.auth-card {
    width: 100%;
    max-width: 400px;
    background: var(--card);
    border: 1px solid var(--line);
    border-radius: 16px;
    box-shadow: 0 20px 50px rgba(30, 41, 59, .08);
    padding: 30px 28px;
}

.auth-brand { display: flex; align-items: center; gap: 12px; margin-bottom: 22px; }
.auth-brand h1 { font-size: 18px; margin: 0; }
.auth-brand p { margin: 2px 0 0; color: var(--muted); font-size: 12.5px; }
.auth-tip { color: var(--muted); font-size: 12px; margin: 18px 0 0; line-height: 1.7; }
.auth-switch { text-align: center; color: var(--muted); font-size: 13px; margin: 16px 0 0; }

/* ---------- 安装页 ---------- */
.setup-body { background: var(--bg); padding: 36px 16px 70px; }
.setup-wrap { max-width: 880px; margin: 0 auto; }
.setup-head { display: flex; align-items: center; gap: 14px; margin-bottom: 22px; }
.setup-head h1 { font-size: 20px; margin: 0; }
.setup-head p { margin: 4px 0 0; color: var(--muted); font-size: 13px; }

.tips { margin: 0; padding-left: 18px; color: #374151; font-size: 13px; line-height: 1.9; }
.tips li { margin: 2px 0; }

/* ---------- 会话 ---------- */
.page-actions { margin-bottom: 14px; }

.chat-head {
    display: flex;
    align-items: flex-start;
    justify-content: space-between;
    gap: 18px;
    flex-wrap: wrap;
}
.chat-name { font-size: 18px; margin: 0 0 8px; word-break: break-all; }
.chat-tags { display: flex; align-items: center; gap: 8px; flex-wrap: wrap; font-size: 12.5px; }
.chat-meta { display: flex; flex-direction: column; align-items: flex-end; gap: 6px; font-size: 12px; }
.chat-meta form { margin: 0; }

.chat-layout {
    display: grid;
    grid-template-columns: minmax(0, 1fr) 330px;
    gap: 18px;
    align-items: start;
}

.messages-card { display: flex; flex-direction: column; padding-bottom: 16px; }

.messages {
    max-height: 560px;
    overflow-y: auto;
    padding: 4px 2px 10px;
    display: flex;
    flex-direction: column;
    gap: 10px;
}

.msg {
    border: 1px solid var(--line);
    border-radius: 10px;
    padding: 9px 12px;
    max-width: 92%;
    background: #fbfcff;
}
.msg.out { align-self: flex-end; background: #eef2ff; border-color: #dfe3ff; }
.msg.in { align-self: flex-start; }

.msg-head { display: flex; align-items: center; gap: 8px; flex-wrap: wrap; font-size: 11.5px; }
.msg-head form { margin: 0; }
.msg-body { margin-top: 6px; font-size: 13.5px; word-break: break-word; white-space: pre-wrap; }
.msg-status { margin-top: 5px; font-size: 11px; color: var(--muted); }

.send-form { border-top: 1px solid var(--line); padding-top: 14px; margin-top: 8px; }
.send-form textarea { margin-bottom: 10px; }
.send-actions { display: flex; align-items: center; justify-content: space-between; gap: 12px; flex-wrap: wrap; }

.side-col { display: flex; flex-direction: column; }

.join-item {
    border: 1px solid var(--line);
    border-radius: 10px;
    padding: 10px 12px;
    margin-bottom: 10px;
    background: #fbfcff;
}
.join-user { display: flex; align-items: center; justify-content: space-between; gap: 8px; font-size: 12px; }
.join-msg { margin: 6px 0; font-size: 12.5px; color: #374151; word-break: break-word; }
.decline-form { display: flex; align-items: center; gap: 6px; flex-wrap: wrap; }
.decline-form input[type="text"] { width: 130px; padding: 4px 8px; font-size: 12px; }

/* ---------- 响应式 ---------- */
@media (max-width: 1000px) {
    .chat-layout { grid-template-columns: 1fr; }
    .chat-meta { align-items: flex-start; }
}

@media (max-width: 820px) {
    .shell { flex-direction: column; }
    .sidebar {
        width: 100%;
        flex: none;
        height: auto;
        position: static;
        flex-direction: row;
        align-items: center;
        gap: 6px;
        padding: 6px 10px;
        overflow-x: auto;
    }
    .brand { padding: 6px 8px; flex: 0 0 auto; }
    .brand small { display: none; }
    .nav { flex-direction: row; padding: 0; flex: 0 0 auto; }
    .nav-item { white-space: nowrap; padding: 7px 10px; font-size: 12.5px; }
    .sidebar-foot { margin-left: auto; border: 0; padding: 0 6px; flex: 0 0 auto; }
    .sidebar-foot .me { display: none; }
    .main { padding: 18px 14px 50px; }
    .grid-2 { grid-template-columns: 1fr; }
    .topbar h1 { font-size: 18px; }
}