/* 封笺 SealNote · 设计令牌与组件（明亮工作风 + 艺术控件） */
:root {
  /* 主色系 A 商务青蓝 */
  --bg: #F4F7FB;
  --bg-soft: #EEF2F8;
  --card: #FFFFFF;
  --line: #DBE4F0;
  --line-soft: #E6ECF5;
  --primary: #2F6FED;
  --primary-2: #5B8DEF;
  --primary-deep: #1D6FB8;
  --accent: #F5A623;
  --success: #2E9E6B;
  --danger: #E05252;
  --ink: #26324A;
  --ink-2: #5B6B85;
  --ink-3: #8A97AD;
  --shadow: 0 4px 14px rgba(40,70,140,.10);
  --shadow-strong: 0 6px 20px rgba(40,70,140,.16);
  --radius-card: 16px;
  --radius-ctl: 12px;
  --radius-chip: 999px;
  --font-body: "Segoe UI", "Microsoft YaHei", "PingFang SC", "Noto Sans SC", system-ui, sans-serif;
  --font-title: var(--font-body);
  --font-mono: "Consolas", "Cascadia Mono", "SF Mono", monospace;
  --glow: 0 0 0 3px rgba(47,111,237,.18);
}

* { margin: 0; padding: 0; box-sizing: border-box; }
html, body { height: 100%; }
body {
  font-family: var(--font-body);
  background: var(--bg);
  background-image:
    radial-gradient(1200px 500px at 15% -10%, rgba(47,111,237,.06), transparent 60%),
    radial-gradient(1000px 420px at 100% 0%, rgba(245,166,35,.05), transparent 55%);
  color: var(--ink);
  font-size: 14px;
  min-height: 100vh;
}
#topbar { position: fixed; top: 0; left: 0; right: 0; z-index: 50; }
.hidden { display: none !important; }

/* 玻璃元素 */
.glass {
  background: rgba(255,255,255,.78);
  backdrop-filter: blur(14px);
  -webkit-backdrop-filter: blur(14px);
  border-bottom: 1px solid var(--line);
}
.topbar { display: flex; align-items: center; justify-content: space-between; padding: 10px 18px; gap: 12px; flex-wrap: wrap; }
.topbar-left { display: flex; align-items: center; gap: 12px; }
.topbar-right { display: flex; align-items: center; gap: 10px; }
.topbar-divider { width: 1px; height: 20px; background: var(--line); }
.conv-title { font-weight: 600; color: var(--ink-2); font-size: 14px; }

/* Logo */
.logo { font-family: var(--font-title); font-size: 20px; font-weight: 800; letter-spacing: 2px;
  background: linear-gradient(135deg, var(--primary), var(--primary-2) 60%, var(--primary-deep));
  -webkit-background-clip: text; background-clip: text; color: transparent; }
.logo-en { font-size: 12px; font-weight: 600; margin-left: 6px; color: var(--ink-3); letter-spacing: 1px;
  -webkit-text-fill-color: var(--ink-3); }

/* 视图切换 */
main { padding-top: 58px; }
.view { display: none; }
.view.active { display: block; animation: fadeIn .25s ease; }
@keyframes fadeIn { from { opacity: 0; transform: translateY(6px);} to { opacity: 1; transform: none;} }

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

/* 认证页 */
.auth-wrap { min-height: calc(100vh - 58px); display: flex; align-items: center; justify-content: center; padding: 24px; }
.auth-card { width: 100%; max-width: 380px; padding: 28px 26px; }
.auth-logo { font-size: 26px; font-weight: 800; text-align: center;
  background: linear-gradient(135deg, var(--primary), var(--primary-deep));
  -webkit-background-clip: text; background-clip: text; color: transparent; }
.auth-sub { text-align: center; color: var(--ink-3); font-size: 12px; margin: 6px 0 20px; }
.field { display: block; margin-bottom: 14px; }
.field span { display: block; font-size: 12px; color: var(--ink-2); margin-bottom: 6px; }
.auth-switch { margin-top: 16px; text-align: center; font-size: 13px; color: var(--ink-2); }
.auth-switch a { color: var(--primary); text-decoration: none; font-weight: 600; }

/* 输入 */
.input { width: 100%; padding: 10px 14px; font-size: 14px; font-family: inherit; color: var(--ink);
  background: var(--card); border: 1px solid var(--line); border-radius: var(--radius-ctl);
  outline: none; transition: border-color .15s, box-shadow .15s; }
.input:focus { border-color: var(--primary); box-shadow: var(--glow); }
.input-ghost { background: var(--bg-soft); border-color: transparent; }
.input-chat { flex: 1; }

/* 按钮 */
.btn-primary { font-family: inherit; font-size: 14px; font-weight: 700; color: #fff; cursor: pointer;
  padding: 10px 18px; border: none; border-radius: var(--radius-ctl);
  background: linear-gradient(135deg, var(--primary), var(--primary-2));
  box-shadow: 0 3px 10px rgba(47,111,237,.30);
  transition: transform .12s, box-shadow .18s, filter .18s; }
.btn-primary:hover { filter: brightness(1.06); box-shadow: 0 5px 16px rgba(47,111,237,.42); }
.btn-primary:active { transform: scale(.97); }
.btn-block { width: 100%; }
.btn-ghost { font-family: inherit; font-size: 13px; color: var(--ink-2); cursor: pointer; padding: 8px 14px;
  background: transparent; border: 1px solid var(--line); border-radius: var(--radius-ctl);
  transition: border-color .15s, color .15s, background .15s; }
.btn-ghost:hover { color: var(--primary); border-color: var(--primary-2); background: rgba(47,111,237,.05); }
.icon-btn { width: 38px; height: 38px; display: inline-flex; align-items: center; justify-content: center;
  font-size: 17px; color: var(--ink-2); background: var(--bg-soft); border: 1px solid transparent;
  border-radius: var(--radius-ctl); cursor: pointer; transition: .15s; }
.icon-btn:hover { color: var(--primary); border-color: var(--primary-2); }

/* 选择器 */
.select { font-family: inherit; font-size: 12px; color: var(--ink-2); padding: 7px 10px;
  background: var(--card); border: 1px solid var(--line); border-radius: var(--radius-ctl); outline: none; cursor: pointer; }
.select:focus { border-color: var(--primary); }

/* 用户条 */
.user-chip { font-size: 13px; font-weight: 600; color: var(--ink); background: var(--bg-soft);
  padding: 6px 12px; border-radius: var(--radius-chip); }

/* 三栏布局 */
.app-layout { display: flex; gap: 12px; padding: 14px; height: calc(100vh - 58px); }
.sidebar { width: 26%; min-width: 210px; max-width: 300px; display: flex; flex-direction: column; padding: 12px; }
.sidebar-search { display: flex; align-items: center; gap: 8px; margin-bottom: 10px; }
.sidebar-search .icon { color: var(--ink-3); flex: none; }
.sidebar-foot { margin-top: auto; display: flex; gap: 8px; padding-top: 10px; border-top: 1px solid var(--line-soft); }
.conv-list { flex: 1; overflow-y: auto; display: flex; flex-direction: column; gap: 6px; }
.conv-item { display: flex; flex-direction: column; gap: 2px; padding: 10px 12px; border-radius: var(--radius-ctl);
  border: 1px solid transparent; cursor: pointer; transition: .15s; }
.conv-item:hover { background: var(--bg-soft); }
.conv-item.active { background: linear-gradient(135deg, rgba(47,111,237,.08), rgba(91,141,239,.05));
  border-color: rgba(47,111,237,.25); }
.conv-item .conv-name { font-size: 13px; font-weight: 600; color: var(--ink); }
.conv-item .conv-meta { font-size: 11px; color: var(--ink-3); display: flex; justify-content: space-between; }

.chat { flex: 1; display: flex; flex-direction: column; overflow: hidden; }
.chat-empty, .profile-empty { flex: 1; display: flex; flex-direction: column; align-items: center; justify-content: center; gap: 10px; color: var(--ink-3); font-size: 13px; }
.empty-seal { font-size: 44px; color: rgba(47,111,237,.35); }
.chat-area { display: flex; flex-direction: column; height: 100%; }
.chat-header { padding: 12px 16px; border-bottom: 1px solid var(--line-soft); font-size: 15px; font-weight: 700; }
.chat-messages { flex: 1; overflow-y: auto; padding: 14px 16px; display: flex; flex-direction: column; gap: 8px; background: var(--bg-soft); }
.msg { max-width: 72%; padding: 9px 13px; border-radius: 14px; font-size: 14px; line-height: 1.5; word-break: break-word; }
.msg.in { align-self: flex-start; background: var(--card); border: 1px solid var(--line-soft); border-top-left-radius: 4px; }
.msg.out { align-self: flex-end; background: linear-gradient(135deg, var(--primary), var(--primary-2)); color: #fff; border-top-right-radius: 4px; }
.msg .msg-meta { font-size: 10px; opacity: .75; margin-top: 4px; display: flex; gap: 6px; align-items: center; }
.msg.out .msg-meta { justify-content: flex-end; }
.chat-input-bar { display: flex; gap: 8px; padding: 12px; border-top: 1px solid var(--line-soft); align-items: center; position: relative; }
.emoji-panel { position: absolute; bottom: calc(100% + 6px); left: 12px; z-index: 40;
  width: 300px; max-height: 180px; overflow-y: auto; display: grid; grid-template-columns: repeat(8, 1fr); gap: 2px;
  background: var(--card); border: 1px solid var(--line); border-radius: 14px; box-shadow: var(--shadow-strong); padding: 8px; }
.emoji-panel button { font-size: 20px; line-height: 1.4; background: none; border: none; border-radius: 8px; cursor: pointer; padding: 3px; }
.emoji-panel button:hover { background: var(--bg-soft); }

/* 用户搜索结果 */
.user-item { display: flex; align-items: center; gap: 8px; padding: 10px 12px; border-radius: var(--radius-ctl);
  border: 1px solid var(--line-soft); cursor: pointer; transition: .15s; font-size: 13px; }
.user-item:hover { background: var(--bg-soft); border-color: var(--primary-2); }
.user-item .u-name { font-weight: 600; }

/* 图片消息 */
.msg img.msg-img { max-width: 100%; max-height: 320px; border-radius: 10px; display: block; }
.msg.locked { font-style: italic; opacity: .7; }

.profile { width: 20%; min-width: 160px; max-width: 240px; padding: 12px; overflow-y: auto; }

/* 徽章 */
.badge { display: inline-flex; align-items: center; gap: 3px; font-size: 10px; font-weight: 700;
  padding: 1px 7px; border-radius: var(--radius-chip); vertical-align: middle; }
.badge.verified { background: rgba(47,111,237,.12); color: var(--primary-deep); }
.badge.gold { background: rgba(245,166,35,.16); color: #A5751B; }
.badge.silver { background: rgba(140,150,175,.16); color: #6B7689; }
.badge.admin { background: rgba(229,82,82,.12); color: var(--danger); }
.tag { display: inline-block; font-size: 10px; padding: 1px 7px; border-radius: var(--radius-chip);
  background: rgba(245,166,35,.14); color: #A5751B; vertical-align: middle; }

/* 在线状态点 */
.dot { display: inline-block; width: 8px; height: 8px; border-radius: 50%; margin-right: 4px; }
.dot.online { background: var(--success); box-shadow: 0 0 0 3px rgba(46,158,107,.18); }
.dot.away { background: var(--accent); }
.dot.offline { background: var(--ink-3); }

/* Toast */
.toast { position: fixed; bottom: 24px; left: 50%; transform: translateX(-50%);
  background: var(--ink); color: #fff; padding: 10px 18px; border-radius: var(--radius-ctl);
  font-size: 13px; box-shadow: var(--shadow-strong); opacity: 0; pointer-events: none; transition: opacity .2s; z-index: 100; }
.toast.show { opacity: 1; }
.toast.error { background: var(--danger); }

/* 滚动条 */
::-webkit-scrollbar { width: 8px; height: 8px; }
::-webkit-scrollbar-thumb { background: var(--line); border-radius: 8px; }
::-webkit-scrollbar-thumb:hover { background: var(--ink-3); }

/* 响应式：手机单栏 */
@media (max-width: 760px) {
  main { padding-top: 54px; }
  .app-layout { padding: 8px; height: calc(100vh - 54px); }
  .sidebar { width: 100%; max-width: none; }
  .profile { display: none; }
  .topbar .conv-title { display: none; }
}

/* ---------- 群聊 ---------- */
.conv-group-tag { margin-left: 6px; font-size: 10px; color: var(--primary); border: 1px solid var(--primary-2);
  border-radius: 6px; padding: 1px 5px; vertical-align: middle; }
.gmember-list { display: flex; flex-direction: column; gap: 6px; }
.gmember-row { display: flex; align-items: center; justify-content: space-between; gap: 8px;
  padding: 7px 10px; border: 1px solid var(--line-soft); border-radius: var(--radius-ctl);
  font-size: 13px; }
.gmember-row:hover { background: var(--bg-soft); }
.btn-primary-xs { background: linear-gradient(135deg, var(--primary), var(--primary-2)); color: #fff;
  border: none; border-radius: 8px; padding: 3px 10px; font-size: 12px; cursor: pointer; }
.btn-danger-xs { background: transparent; color: var(--danger, #C0392B); border: 1px solid
  rgba(192, 57, 43, .35); border-radius: 8px; padding: 2px 7px; font-size: 12px; cursor: pointer; }
.btn-danger-xs:hover { background: rgba(192, 57, 43, .08); }

/* ---------- 弹窗 / 模态 ---------- */
.modal-overlay { position: fixed; inset: 0; z-index: 100; background: rgba(23, 42, 66, .42);
  backdrop-filter: blur(4px); display: flex; align-items: center; justify-content: center; padding: 16px; }
.modal-card { background: var(--card); border: 1px solid var(--line); border-radius: 18px;
  box-shadow: var(--shadow-strong); padding: 20px; width: 100%; }
.modal-title { font-weight: 700; font-size: 15px; margin-bottom: 14px; }

/* ---------- 一键销毁 ---------- */
.btn-danger-icon { position: relative; width: 34px; height: 34px; border-radius: 50%;
  background: rgba(192, 57, 43, .08); color: rgba(192, 57, 43, .38); border: 1px solid rgba(192, 57, 43, .15);
  cursor: pointer; display: inline-flex; align-items: center; justify-content: center;
  font-size: 13px; transition: .2s; overflow: hidden; }
.btn-danger-icon::before { content: '◈'; opacity: .55; }
.btn-danger-icon.holding { color: rgba(192, 57, 43, .9); border-color: rgba(192, 57, 43, .5);
  background: rgba(192, 57, 43, .14); }
.danger-ring { position: absolute; inset: 2px; border-radius: 50%; pointer-events: none; opacity: 0; }
.btn-danger-icon.holding .danger-ring { opacity: 1; animation: ring-spin 2s linear forwards; }
@keyframes ring-spin {
  from { box-shadow: inset 0 0 0 0 rgba(192, 57, 43, .55); }
  to { box-shadow: inset 0 0 0 9px rgba(192, 57, 43, 0); }
}
.destroy-code { font-size: 30px; letter-spacing: 14px; font-weight: 700; color: var(--primary-deep);
  cursor: pointer; user-select: none; margin: 6px 0 12px; text-align: center; }
.destroy-code-label { font-size: 12px; color: var(--ink-3); margin-bottom: 4px; }
.destroy-input-row { display: flex; justify-content: center; gap: 10px; margin-bottom: 14px; }
.destroy-slot { width: 34px; height: 38px; border: 1px dashed var(--line); border-radius: 10px;
  display: flex; align-items: center; justify-content: center; font-size: 16px; background: var(--bg-soft); }
.destroy-hint { font-size: 12px; margin-top: 8px; text-align: center; }
.destroy-warn { font-size: 13px; color: var(--danger, #C0392B); line-height: 1.6; text-align: center; }
.virtkbd { display: grid; grid-template-columns: repeat(3, 1fr); gap: 8px; max-width: 260px; margin: 0 auto; }
.vk-key { height: 44px; border-radius: 12px; border: 1px solid var(--line); background: var(--card);
  font-size: 18px; cursor: pointer; color: var(--ink-1); transition: .12s; }
.vk-key:hover { background: var(--bg-soft); border-color: var(--primary-2); }
.vk-key:active { transform: scale(.96); }
.vk-del { color: var(--ink-3); }
.vk-ok { background: linear-gradient(135deg, var(--primary), var(--primary-2)); color: #fff; border: none; }
.btn-danger { background: linear-gradient(135deg, #C0392B, #E74C3C); color: #fff; border: none;
  border-radius: var(--radius-ctl); padding: 9px 18px; font-size: 13px; cursor: pointer; }
.btn-danger:disabled { opacity: .5; cursor: not-allowed; }

/* ---------- 管理后台 ---------- */
.admin-wrap { max-width: 1100px; margin: 0 auto; padding: 18px 16px 40px; display: flex;
  flex-direction: column; gap: 14px; min-height: calc(100vh - 54px); }
.admin-top { display: flex; align-items: center; justify-content: space-between; }
.admin-tabs { display: flex; gap: 6px; flex-wrap: wrap; }
.admin-tab { border: 1px solid var(--line); background: var(--card); border-radius: var(--radius-ctl);
  padding: 7px 14px; font-size: 13px; cursor: pointer; color: var(--ink-2); transition: .15s; }
.admin-tab.active { background: linear-gradient(135deg, var(--primary), var(--primary-2)); color: #fff; border-color: transparent; }
.admin-content { padding: 18px; overflow: hidden; }
.admin-scroll { overflow: auto; max-height: 62vh; }
.admin-table { width: 100%; border-collapse: collapse; font-size: 12.5px; }
.admin-table th { text-align: left; padding: 8px 10px; color: var(--ink-3); font-weight: 600;
  border-bottom: 1px solid var(--line); white-space: nowrap; }
.admin-table td { padding: 8px 10px; border-bottom: 1px solid var(--line-soft); vertical-align: middle; }
.admin-table tr:hover td { background: var(--bg-soft); }
.td-strong { font-weight: 600; }
.td-center { text-align: center; color: var(--ink-3); }
.td-actions { white-space: nowrap; }
.mono { font-family: Consolas, "Cascadia Mono", monospace; letter-spacing: .5px; }
.flash-row td { background: rgba(245, 166, 35, .12); animation: flash-fade 2.4s ease; }
@keyframes flash-fade { from { background: rgba(245, 166, 35, .28); } to { background: transparent; } }
.admin-row { display: flex; gap: 14px; flex-wrap: wrap; align-items: flex-end; }
.card-mini { border: 1px solid var(--line-soft); border-radius: 14px; padding: 14px; background: var(--card); }
.admin-h2 { font-weight: 700; font-size: 13.5px; margin-bottom: 12px; }
.badge.ok { background: rgba(46, 204, 113, .12); color: #1E8E4E; }
.badge.banned { background: rgba(192, 57, 43, .12); color: #C0392B; }
.btn-ghost-xs { background: transparent; border: 1px solid var(--line); border-radius: 8px;
  padding: 3px 9px; font-size: 12px; cursor: pointer; color: var(--ink-2); }
.btn-ghost-xs:hover { border-color: var(--primary-2); color: var(--primary); }
@media (max-width: 760px) {
  .admin-table { font-size: 11px; }
  .admin-content { padding: 12px; overflow: auto; }
}

/* ---------- PWA 安装按钮 ---------- */
.install-btn { display: inline-flex; align-items: center; gap: 4px; font-size: 12px;
  padding: 6px 10px; border-radius: 10px; color: var(--primary); border-color: var(--primary-2);
  background: rgba(47, 111, 237, .06); }
.install-btn:hover { background: rgba(47, 111, 237, .12); }
@media (max-width: 760px) {
  .install-btn span { display: none; }
  .install-btn { padding: 6px 8px; font-size: 13px; }
}

/* ---------- 侧栏会话/联系人标签页 ---------- */
.sidebar-tabs { display: flex; gap: 6px; margin-bottom: 10px; }
.side-tab { flex: 1; border: 1px solid var(--line); background: var(--card); border-radius: 10px;
  padding: 7px 0; font-size: 12.5px; cursor: pointer; color: var(--ink-2); transition: .15s; }
.side-tab:hover { border-color: var(--primary-2); color: var(--primary); }
.side-tab.active { background: linear-gradient(135deg, var(--primary), var(--primary-2)); color: #fff; border-color: transparent; }

/* ---------- 顶栏：汉堡菜单 + 帮助 ---------- */
.menu-btn { display: inline-flex; flex-direction: column; justify-content: center; gap: 3px;
  width: 34px; height: 34px; border-radius: 10px; }
.menu-btn .menu-bar { display: block; width: 16px; height: 2px; border-radius: 2px;
  background: var(--ink-2); margin: 0 auto; transition: .2s; }
.menu-btn:hover .menu-bar { background: var(--primary); }
.help-btn { font-weight: 700; font-style: italic; font-size: 15px; }

/* ---------- Enter 发送模式按钮 ---------- */
.enter-mode-btn { width: 34px; height: 34px; flex: none; color: var(--ink-3);
  border-color: var(--line); }
.enter-mode-btn.on { color: var(--primary); border-color: var(--primary-2);
  background: rgba(47, 111, 237, .08); }

/* ---------- 使用教程 ---------- */
.tut-card { max-width: 460px; max-height: 82vh; display: flex; flex-direction: column; }
.tut-head { display: flex; align-items: center; justify-content: space-between; margin-bottom: 4px; }
.tut-title { font-weight: 700; font-size: 15px; }
.tut-close { width: 30px; height: 30px; color: var(--ink-3); }
.tut-scroll { overflow-y: auto; padding-right: 4px; flex: 1; }
.tut-step { padding: 12px 2px; border-bottom: 1px dashed var(--line-soft); }
.tut-step:last-child { border-bottom: none; }
.tut-h { font-weight: 700; font-size: 13.5px; color: var(--primary-deep); margin-bottom: 5px; }
.tut-b { font-size: 12.5px; line-height: 1.75; color: var(--ink-2); }
.tut-foot { display: flex; justify-content: flex-end; padding-top: 12px; }

/* ---------- 手机端：侧栏折叠抽屉 ---------- */
@media (max-width: 760px) {
  .menu-btn { display: inline-flex; }
  .app-layout { position: relative; }
  .sidebar { position: fixed; left: 0; top: 54px; bottom: 0; width: 84%;
    max-width: 320px; margin: 0; border-radius: 0 18px 18px 0; z-index: 60;
    transform: translateX(-105%); transition: transform .24s ease; box-shadow: var(--shadow-strong); }
  .app-layout.sidebar-open .sidebar { transform: translateX(0); }
  .chat { border-radius: 16px; }
  .chat-input-bar { padding: 8px 8px; gap: 6px; }
  .input-chat { min-height: 40px; font-size: 15px; }
  .msg { max-width: 86%; }
  .enter-mode-btn { width: 36px; height: 36px; }
  .tut-card { max-height: 88vh; }
  .topbar-right .select { max-width: 86px; }
  .topbar { padding: 0 8px; gap: 6px; }
  .user-chip { font-size: 12px; }
}