*,*::before,*::after{box-sizing:border-box}
:root{
  --bg:#fff;
  --bg-soft:#FAFBFC;
  --panel:#fff;
  --text:#16181D;
  --text2:#626B7A;
  --text3:#9BA3AF;
  --line:#EAEDF2;
  --line2:#F2F4F7;
  --primary:#2B6BFF;
  --primary-2:#5B8CFF;
  --soft:#EDF3FF;
  --soft2:#F6F9FF;
  --ok:#16A34A;
  --warn:#F59E0B;
  --danger:#EF4444;
  --radius:18px;
  --shadow-sm:0 1px 2px rgba(16,24,40,.05);
  --shadow:0 10px 30px rgba(16,32,64,.07);
  --shadow-lg:0 24px 70px rgba(16,32,64,.16);
  --rail:60px; --side:248px; --top:60px;
}
html,body{height:100%;margin:0}
body{
  background:var(--bg);color:var(--text);font-size:14px;line-height:1.55;
  font-family:-apple-system,BlinkMacSystemFont,"Segoe UI","PingFang SC","Hiragino Sans GB","Microsoft YaHei",sans-serif;
  -webkit-font-smoothing:antialiased;
}
a{color:inherit;text-decoration:none}
button{font:inherit;color:inherit;background:none;border:0;cursor:pointer}
input,textarea,select{font:inherit;color:inherit;outline:none}
img{display:block;max-width:100%}
::-webkit-scrollbar{width:8px;height:8px}
::-webkit-scrollbar-thumb{background:#DDE1E8;border-radius:8px}
::-webkit-scrollbar-thumb:hover{background:#CBD1DA}
::-webkit-scrollbar-track{background:transparent}

/* ---------- shell ---------- */
.app{display:flex;flex-direction:column;height:100vh;overflow:hidden}
.topbar{
  height:var(--top);flex:0 0 auto;display:flex;align-items:center;gap:14px;
  padding:0 16px;background:var(--panel);border-bottom:1px solid var(--line);z-index:40;
}
.brand{display:flex;align-items:center;gap:9px;font-weight:600;font-size:15px;letter-spacing:.2px;min-width:0}
.brand .mark{flex:0 0 auto}
.brand .bname{overflow:hidden;text-overflow:ellipsis;white-space:nowrap}
.brand .mark{
  width:30px;height:30px;border-radius:9px;display:grid;place-items:center;color:#fff;font-size:15px;
  background:linear-gradient(135deg,#2B6BFF,#6BA0FF);box-shadow:0 4px 12px rgba(43,107,255,.32)
}
.topnav{display:flex;align-items:center;gap:2px;margin-left:6px}
.topnav a{padding:7px 12px;border-radius:10px;color:var(--text2);font-size:13.5px;transition:.15s}
.topnav a:hover{background:var(--bg-soft);color:var(--text)}
.topnav a.on{background:var(--soft);color:var(--primary);font-weight:600}
.top-right{margin-left:auto;display:flex;align-items:center;gap:8px}
.pill{
  display:inline-flex;align-items:center;gap:6px;height:32px;padding:0 12px;border-radius:999px;
  background:var(--soft);color:var(--primary);font-size:13px;font-weight:600;white-space:nowrap;flex:0 0 auto;
}
.pill.ghost{background:transparent;color:var(--text2);font-weight:500;border:1px solid var(--line)}
.pill.ghost:hover{background:var(--bg-soft);color:var(--text)}
.iconbtn{
  width:34px;height:34px;border-radius:10px;display:grid;place-items:center;color:var(--text2);transition:.15s
}
.iconbtn:hover{background:var(--bg-soft);color:var(--text)}
.avatar{
  width:32px;height:32px;border-radius:999px;display:grid;place-items:center;color:#fff;font-size:13px;font-weight:600;
  background:linear-gradient(135deg,#8B5CF6,#C084FC);cursor:pointer
}
.burger{display:none}
.only-mobile{display:none}

.body{flex:1;display:flex;min-height:0}

/* ---------- rail ---------- */
.rail{
  width:var(--rail);flex:0 0 auto;background:var(--bg-soft);border-right:1px solid var(--line);
  display:flex;flex-direction:column;align-items:center;padding:12px 0;gap:6px
}
.rail a,.rail button{
  width:42px;height:42px;border-radius:13px;display:grid;place-items:center;color:var(--text3);transition:.18s;position:relative
}
.rail a:hover,.rail button:hover{background:#EEF1F6;color:var(--text2)}
.rail .on{background:var(--soft);color:var(--primary)}
.rail .sp{flex:1}
.rail .tip{
  position:absolute;left:52px;top:50%;transform:translateY(-50%);background:#1F2430;color:#fff;
  padding:5px 9px;border-radius:8px;font-size:12px;white-space:nowrap;opacity:0;pointer-events:none;transition:.15s;z-index:60
}
.rail a:hover .tip,.rail button:hover .tip{opacity:1}

/* ---------- sidebar ---------- */
.sidebar{
  width:var(--side);flex:0 0 auto;background:var(--bg-soft);border-right:1px solid var(--line);
  display:flex;flex-direction:column;min-height:0
}
.side-nav{display:none;flex-direction:column;gap:2px;padding:0 10px 10px;margin-bottom:6px}
.side-nav a{display:flex;align-items:center;gap:9px;height:40px;padding:0 11px;border-radius:11px;font-size:13.5px;color:var(--text2)}
.side-nav a:hover{background:#EFF2F7;color:var(--text)}
.side-nav a.on{background:var(--soft);color:var(--primary);font-weight:600}
.side-head{display:flex;align-items:center;justify-content:space-between;padding:14px 14px 8px}
.side-head h3{margin:0;font-size:13px;color:var(--text3);font-weight:600;letter-spacing:.4px}
.newchat{
  margin:2px 12px 10px;height:40px;border-radius:12px;background:var(--panel);border:1px solid var(--line);
  display:flex;align-items:center;gap:8px;padding:0 12px;font-size:13.5px;font-weight:600;color:var(--text);
  box-shadow:var(--shadow-sm);transition:.15s
}
.newchat:hover{border-color:#D8DFEA;box-shadow:0 4px 14px rgba(16,32,64,.08)}
.conv-list{flex:1;overflow-y:auto;padding:0 8px 16px;min-height:0}
.conv{
  display:flex;align-items:center;gap:9px;padding:9px 10px;border-radius:11px;cursor:pointer;color:var(--text2);
  font-size:13.5px;transition:.14s
}
.conv:hover{background:#EFF2F7;color:var(--text)}
.conv.on{background:var(--soft);color:var(--primary);font-weight:600}
.conv .txt{flex:1;min-width:0;overflow:hidden;text-overflow:ellipsis;white-space:nowrap}
.conv .del{opacity:0;color:var(--text3);font-size:15px;line-height:1;padding:2px 4px;border-radius:6px}
.conv:hover .del{opacity:1}
.conv .del:hover{background:#E6EAF1;color:var(--danger)}
.side-foot{padding:10px 14px;border-top:1px solid var(--line);font-size:12px;color:var(--text3)}

/* ---------- main ---------- */
.main{flex:1;min-width:0;display:flex;flex-direction:column;position:relative;background:var(--bg)}
.float-actions{position:absolute;top:14px;right:18px;z-index:20;display:flex;gap:8px}
.fbtn{
  height:34px;padding:0 14px;border-radius:999px;background:var(--panel);border:1px solid var(--line);
  font-size:13px;color:var(--text2);display:inline-flex;align-items:center;gap:6px;box-shadow:var(--shadow-sm);transition:.15s
}
.fbtn:hover{border-color:#D8DFEA;color:var(--text);box-shadow:0 4px 14px rgba(16,32,64,.08)}

.scroll{flex:1;overflow-y:auto;min-height:0}

/* hero / empty state */
.hero{padding:0 24px}
.hero-inner{max-width:820px;margin:0 auto;padding-top:8vh}
.hero h1{
  text-align:center;font-size:clamp(22px,3.2vw,30px);font-weight:700;letter-spacing:-.4px;margin:0 0 22px
}
.hero-sub{text-align:center;color:var(--text3);font-size:13px;margin:-14px 0 24px}

/* composer */
.composer{
  background:var(--panel);border:1px solid var(--line);border-radius:var(--radius);box-shadow:var(--shadow);
  padding:12px 14px 10px;transition:.2s
}
.composer:focus-within{border-color:#D6E0F5;box-shadow:0 14px 40px rgba(16,32,64,.10)}
.tabs{display:flex;align-items:center;gap:4px;flex-wrap:wrap}
.tab{
  height:30px;padding:0 11px;border-radius:9px;display:inline-flex;align-items:center;gap:6px;
  font-size:13px;color:var(--text3);transition:.14s
}
.tab:hover{background:var(--bg-soft);color:var(--text2)}
.tab.on{background:var(--soft);color:var(--primary);font-weight:600}
.tab.dim{opacity:.45;cursor:not-allowed}
.tab .soon{font-size:10px;background:#F1F3F7;color:var(--text3);padding:1px 5px;border-radius:5px;font-weight:500}
.tabs-right{margin-left:auto;display:flex;align-items:center;gap:6px;font-size:12.5px;color:var(--text3)}

.editor{position:relative;padding:10px 2px 4px;display:flex;gap:10px}
.upload{
  width:34px;height:34px;flex:0 0 auto;border-radius:10px;border:1px dashed #D7DCE5;display:grid;place-items:center;
  color:var(--text3);transition:.15s
}
.upload:hover{border-color:var(--primary-2);color:var(--primary);background:var(--soft2)}
.editor textarea{
  flex:1;border:0;resize:none;min-height:74px;max-height:220px;font-size:14px;line-height:1.6;
  background:transparent;padding:6px 4px 0
}
.editor textarea::placeholder{color:var(--text3)}
.thumbs{display:flex;gap:8px;padding:6px 2px 0;flex-wrap:wrap}
.thumb{position:relative;width:56px;height:56px;border-radius:10px;overflow:hidden;border:1px solid var(--line)}
.thumb img{width:100%;height:100%;object-fit:cover}
.thumb i{
  position:absolute;top:-6px;right:-6px;width:18px;height:18px;border-radius:50%;background:#1F2430;color:#fff;
  font-size:11px;font-style:normal;display:grid;place-items:center;cursor:pointer
}
.toolbar{display:flex;align-items:center;gap:6px;flex-wrap:wrap;padding-top:6px;border-top:1px solid var(--line2);margin-top:6px}
.ctl{
  height:32px;padding:0 9px;border-radius:10px;display:inline-flex;align-items:center;gap:6px;
  font-size:13px;color:var(--text2);transition:.14s;white-space:nowrap
}
.ctl:hover{background:var(--bg-soft);color:var(--text)}
.ctl .car{opacity:.45;font-size:10px}
.cost{margin-left:auto;display:flex;align-items:center;gap:6px;font-size:12.5px;color:var(--text3)}
.cost b{color:var(--primary);font-weight:600}
.send{
  width:38px;height:38px;border-radius:50%;display:grid;place-items:center;color:#fff;
  background:#D8E2FB;transition:.18s;flex:0 0 auto
}
.send.on{background:linear-gradient(135deg,#2B6BFF,#5B8CFF);box-shadow:0 6px 18px rgba(43,107,255,.35)}
.send.on:hover{transform:translateY(-1px)}

/* dropdown */
.dd{position:relative}
.menu{
  position:absolute;bottom:calc(100% + 8px);left:0;min-width:184px;max-height:300px;overflow:auto;
  background:var(--panel);border:1px solid var(--line);border-radius:14px;box-shadow:var(--shadow-lg);
  padding:6px;z-index:60;display:none
}
.menu.up{bottom:calc(100% + 8px)}
.menu.down{bottom:auto;top:calc(100% + 8px)}
.menu.show{display:block}
.menu .mh{font-size:11.5px;color:var(--text3);padding:6px 10px 4px;font-weight:600}
.menu .mi{
  display:flex;align-items:center;gap:8px;padding:9px 10px;border-radius:9px;font-size:13.5px;cursor:pointer;color:var(--text2)
}
.menu .mi:hover{background:var(--bg-soft);color:var(--text)}
.menu .mi.on{color:var(--primary);font-weight:600;background:var(--soft)}
.menu .mi .ck{margin-left:auto;color:var(--primary);font-size:12px}
.menu .mi small{margin-left:auto;color:var(--text3);font-weight:400;font-size:11.5px}

/* conversation */
.chat{padding:26px 24px 8px}
.chat-inner{max-width:920px;margin:0 auto;display:flex;flex-direction:column;gap:26px}
.msg-user{display:flex;justify-content:flex-end}
.bubble{
  max-width:min(620px,84%);background:linear-gradient(135deg,#2B6BFF,#4C85FF);color:#fff;
  padding:11px 15px;border-radius:16px 16px 4px 16px;font-size:14px;line-height:1.6;box-shadow:0 8px 22px rgba(43,107,255,.22)
}
.gen{display:flex;gap:14px;align-items:flex-start}
.gen-main{min-width:0}
.gen-head{font-size:12.5px;color:var(--text3);margin-bottom:8px;display:flex;align-items:center;gap:8px}
.gen-head b{color:var(--text2);font-weight:600}
.gen-img{
  border-radius:14px;overflow:hidden;border:1px solid var(--line);background:#F4F6FA;
  width:min(420px,72vw);box-shadow:var(--shadow-sm)
}
.gen-img img{width:100%}
.gen-actions{display:flex;flex-direction:column;gap:8px}
.act{
  width:34px;height:34px;border-radius:50%;border:1px solid var(--line);background:var(--panel);color:var(--text2);
  display:grid;place-items:center;transition:.15s
}
.act:hover{border-color:#D6E0F5;color:var(--primary);background:var(--soft2);transform:translateY(-1px)}
.gen-foot{margin-top:12px;display:flex;gap:8px;flex-wrap:wrap}
.promptbar{
  margin-top:12px;display:flex;align-items:center;gap:8px;flex-wrap:wrap;
  background:var(--bg-soft);border:1px solid var(--line);border-radius:12px;padding:9px 11px
}
.promptbar .p{flex:1;min-width:0;font-size:12.5px;color:var(--text2);overflow:hidden;text-overflow:ellipsis;white-space:nowrap}

.skeleton{width:min(420px,72vw);aspect-ratio:1/1;border-radius:14px;background:#F1F3F7;position:relative;overflow:hidden}
.skeleton::after{
  content:"";position:absolute;inset:0;background:linear-gradient(90deg,transparent,rgba(255,255,255,.85),transparent);
  transform:translateX(-100%);animation:sk 1.4s infinite
}
@keyframes sk{to{transform:translateX(100%)}}
.spin{width:22px;height:22px;border-radius:50%;border:2.5px solid #E3E8F2;border-top-color:var(--primary);animation:sp .8s linear infinite}
@keyframes sp{to{transform:rotate(360deg)}}

.dock{position:sticky;bottom:0;background:linear-gradient(to top,var(--bg) 62%,rgba(255,255,255,0));padding:10px 24px 20px}
.dock .composer{max-width:920px;margin:0 auto}

/* modal + drawer */
.mask{position:fixed;inset:0;background:rgba(16,24,40,.35);backdrop-filter:blur(2px);z-index:80;display:none}
.mask.show{display:block}
.modal{
  position:fixed;left:50%;top:50%;transform:translate(-50%,-48%);width:min(720px,92vw);max-height:86vh;overflow:auto;
  background:var(--panel);border-radius:20px;box-shadow:var(--shadow-lg);z-index:90;display:none
}
.modal.show{display:block;animation:pop .18s ease-out}
@keyframes pop{from{opacity:0;transform:translate(-50%,-46%) scale(.98)}}
.modal-head{display:flex;align-items:center;justify-content:space-between;padding:16px 18px;border-bottom:1px solid var(--line)}
.modal-head h3{margin:0;font-size:15px}
.modal-body{padding:18px}
.drawer{
  position:fixed;top:0;right:0;height:100%;width:min(380px,92vw);background:var(--panel);z-index:90;
  box-shadow:var(--shadow-lg);transform:translateX(102%);transition:transform .24s cubic-bezier(.2,.7,.3,1);
  display:flex;flex-direction:column
}
.drawer.show{transform:none}
.drawer-head{display:flex;align-items:center;justify-content:space-between;padding:18px;border-bottom:1px solid var(--line)}
.drawer-body{padding:18px;overflow:auto;flex:1}

/* misc */
.btn{height:38px;padding:0 16px;border-radius:11px;display:inline-flex;align-items:center;justify-content:center;gap:7px;font-size:13.5px;font-weight:600;transition:.15s}
.btn.pri{background:linear-gradient(135deg,#2B6BFF,#4C85FF);color:#fff;box-shadow:0 6px 18px rgba(43,107,255,.28)}
.btn.pri:hover{transform:translateY(-1px)}
.btn.gh{border:1px solid var(--line);background:var(--panel);color:var(--text2)}
.btn.gh:hover{border-color:#D8DFEA;color:var(--text)}
.btn.dg{background:#FEF2F2;color:var(--danger)}
.btn.sm{height:30px;padding:0 11px;font-size:12.5px;border-radius:9px}
.row{display:flex;align-items:center;gap:10px}
.between{display:flex;align-items:center;justify-content:space-between;gap:12px}
.muted{color:var(--text3)}
.tiny{font-size:12px}
.toast{
  position:fixed;left:50%;bottom:36px;transform:translateX(-50%) translateY(10px);background:#1F2430;color:#fff;
  padding:10px 16px;border-radius:12px;font-size:13px;z-index:200;opacity:0;transition:.2s;pointer-events:none
}
.toast.show{opacity:1;transform:translateX(-50%)}

/* ---------- table (admin) ---------- */
.tbl{width:100%;border-collapse:collapse;font-size:13px}
.tbl th{
  text-align:left;padding:11px 12px;color:var(--text3);font-weight:600;font-size:12px;background:#FAFBFC;
  border-bottom:1px solid var(--line);white-space:nowrap
}
.tbl td{padding:12px;border-bottom:1px solid var(--line2);color:var(--text2)}
.tbl tr:hover td{background:#FCFDFF}
.tag{display:inline-flex;align-items:center;gap:5px;height:22px;padding:0 9px;border-radius:999px;font-size:11.5px;font-weight:600}
.tag.g{background:#EAF7EF;color:#16A34A}
.tag.r{background:#FEF2F2;color:#EF4444}
.tag.b{background:var(--soft);color:var(--primary)}
.tag.y{background:#FFF7ED;color:#D97706}
.tag.n{background:#F2F4F7;color:#667085}

/* ---------- mobile ---------- */
@media (max-width:900px){
  :root{--top:56px}
  .topnav{display:none}
  .burger{display:grid}
  .rail{display:none}
  .side-nav{display:flex}
  .only-desktop{display:none}
  .only-mobile{display:inline}
  .sidebar{
    position:fixed;left:0;top:0;height:100%;z-index:100;width:min(280px,84vw);transform:translateX(-102%);
    transition:transform .24s cubic-bezier(.2,.7,.3,1);box-shadow:var(--shadow-lg)
  }
  .sidebar.show{transform:none}

  /* 顶栏：窄屏只保留 汉堡 + 站名 + 积分 + 头像，且一律不换行 */
  .topbar{gap:8px;padding-left:max(12px,env(safe-area-inset-left));padding-right:max(12px,env(safe-area-inset-right))}
  .brand{flex:1 1 auto;min-width:0;font-size:14.5px;gap:8px;letter-spacing:0}
  .top-right{gap:6px;flex:0 0 auto;margin-left:0}
  .top-right .pill.ghost{display:none}
  .pill{height:28px;padding:0 10px;font-size:12.5px}
  .avatar{width:30px;height:30px}

  /* 浮动「历史生成」在窄屏会压住标题，导航改由侧栏承担 */
  .float-actions{display:none}

  .hero{padding:0 14px}
  .hero-inner{padding-top:18px}
  .hero h1{font-size:20px;margin-bottom:14px}
  .composer{padding:10px 12px 8px;border-radius:16px}
  .editor{padding:8px 0 2px;gap:8px}
  .editor textarea{min-height:60px;font-size:15px}

  /* 工具栏：尺寸项换行没问题，但「本次消耗 + 发送」必须留在同一行靠右 */
  .toolbar{gap:4px 2px}
  .ctl{height:30px;padding:0 7px;font-size:12.5px}
  .cost{margin-left:auto;width:auto;padding-top:0;white-space:nowrap}
  .send{width:34px;height:34px}

  .chat{padding:16px 14px 8px}
  .dock{padding:8px 12px calc(14px + env(safe-area-inset-bottom))}
  .gen{gap:10px}
  .gen-img,.skeleton{width:min(100%,78vw)}
  .gen-actions{flex-direction:row;flex-wrap:wrap}
  .drawer{width:min(360px,92vw)}
  .modal{width:94vw}
}

/* ---------- 真实页面的补充样式 ---------- */
.switch{width:32px;height:19px;border-radius:999px;background:#E3E7EE;position:relative;display:inline-block;transition:.18s;cursor:pointer;vertical-align:-4px}
.switch::after{content:"";position:absolute;top:2px;left:2px;width:15px;height:15px;border-radius:50%;background:#fff;transition:.18s;box-shadow:0 1px 3px rgba(0,0,0,.18)}
.switch.on{background:var(--primary)}
.switch.on::after{transform:translateX(13px)}
.loading-mask{position:fixed;inset:0;background:rgba(255,255,255,.72);z-index:150;display:none;align-items:center;justify-content:center}
.loading-mask.show{display:flex}
.err{color:var(--danger);font-size:13px}
.gen-imgs{display:flex;gap:10px;flex-wrap:wrap}
.gen-imgs .gen-img{margin:0}
.thumb-sm{width:46px;height:46px;border-radius:9px;object-fit:cover;border:1px solid var(--line)}
.empty-tip{text-align:center;color:var(--text3);padding:60px 0;font-size:13.5px}
.badge-soft{display:inline-flex;align-items:center;gap:4px;height:22px;padding:0 8px;border-radius:7px;background:var(--soft);color:var(--primary);font-size:11.5px;font-weight:600}
.login-wrap{min-height:100vh;display:flex;align-items:center;justify-content:center;padding:24px;background:linear-gradient(135deg,#EEF3FF,#F7F9FF)}
.login-card{width:min(400px,100%);background:#fff;border-radius:20px;box-shadow:var(--shadow-lg);padding:32px 28px}
/* 登录 / 注册切换：没有 .on 样式时点了完全看不出来，这里是必需的 */
.seg{display:flex;gap:3px;background:#F1F3F7;border-radius:12px;padding:3px}
.seg button{flex:1;height:36px;border-radius:9px;font-size:13.5px;color:var(--text2);font-weight:500;transition:background .18s,color .18s,box-shadow .18s}
.seg button:hover{color:var(--text)}
.seg button.on{background:#fff;color:var(--primary);font-weight:600;box-shadow:0 2px 8px rgba(16,32,64,.10)}
.fld .inp{transition:border-color .18s,box-shadow .18s}
.fld .inp:focus{border-color:#9DBAFF;box-shadow:0 0 0 3px rgba(43,107,255,.12)}