/* ==========================================================
   SulitAI - styles.css  (single source of truth)
   Markdown renderer demotes headings one level (h2-h6, never h1).
   ========================================================== */
:root {
  --bg:#f4f5f7; --surface:#ffffff; --surface-2:#f9fafb; --surface-3:#f1f3f5;
  --text:#111827; --muted:#6b7280; --border:#e5e7eb; --border-strong:#d1d5db;
  --primary:#2563eb; --primary-hover:#1d4ed8; --primary-soft:#dbeafe; --on-primary:#fff;
  --danger:#dc2626; --danger-soft:#fee2e2;
  --success:#15803d; --success-soft:#dcfce7;
  --warning:#b45309; --warning-soft:#fef3c7;
  --info:#0e7490; --info-soft:#cffafe;
  --radius:10px; --radius-sm:6px;
  --shadow:0 1px 2px rgba(0,0,0,.05),0 4px 14px rgba(0,0,0,.06);
  --shadow-lg:0 12px 48px rgba(0,0,0,.22);
  --font:-apple-system,BlinkMacSystemFont,'Segoe UI',Roboto,Helvetica,Arial,sans-serif;
  --mono:ui-monospace,'SF Mono',Menlo,Consolas,monospace;
  color-scheme: light;
}
@media (prefers-color-scheme: dark) {
  :root:not([data-theme="light"]) {
    --bg:#0f1218; --surface:#1a1f2b; --surface-2:#161b24; --surface-3:#232936;
    --text:#e6e9ef; --muted:#8b93a7; --border:#2a3040; --border-strong:#3a4255;
    --primary:#4f8cff; --primary-hover:#6fa1ff; --primary-soft:rgba(79,140,255,.16);
    --danger:#ff6b6b; --danger-soft:rgba(255,107,107,.14);
    --success:#4ade80; --success-soft:rgba(74,222,128,.14);
    --warning:#fbbf24; --warning-soft:rgba(251,191,36,.14);
    --info:#38bdf8; --info-soft:rgba(56,189,248,.14);
    --shadow:0 1px 2px rgba(0,0,0,.4),0 4px 14px rgba(0,0,0,.3);
    --shadow-lg:0 12px 48px rgba(0,0,0,.55);
    color-scheme: dark;
  }
}
:root[data-theme="dark"] {
  --bg:#0f1218; --surface:#1a1f2b; --surface-2:#161b24; --surface-3:#232936;
  --text:#e6e9ef; --muted:#8b93a7; --border:#2a3040; --border-strong:#3a4255;
  --primary:#4f8cff; --primary-hover:#6fa1ff; --primary-soft:rgba(79,140,255,.16);
  --danger:#ff6b6b; --danger-soft:rgba(255,107,107,.14);
  --success:#4ade80; --success-soft:rgba(74,222,128,.14);
  --warning:#fbbf24; --warning-soft:rgba(251,191,36,.14);
  --info:#38bdf8; --info-soft:rgba(56,189,248,.14);
  --shadow:0 1px 2px rgba(0,0,0,.4),0 4px 14px rgba(0,0,0,.3);
  --shadow-lg:0 12px 48px rgba(0,0,0,.55);
  color-scheme: dark;
}
:root[data-theme="light"] { color-scheme: light; }
*{box-sizing:border-box;margin:0;padding:0}
html{height:100%}
body{min-height:100%;font-family:var(--font);background:var(--bg);color:var(--text);
  line-height:1.55;-webkit-font-smoothing:antialiased}
img,video{max-width:100%;height:auto}
a{color:var(--primary);text-decoration:none}
a:hover{text-decoration:underline}
h1{font-size:1.6rem;font-weight:700;letter-spacing:-.02em}
h2{font-size:1.3rem;font-weight:600}
h3{font-size:1.05rem;font-weight:600}
h4{font-size:.8rem;font-weight:600}
:focus-visible{outline:2px solid var(--primary);outline-offset:2px}
.hidden,[hidden]{display:none !important}
/* ---- utilities ---- */
.text-muted{color:var(--muted)}
.text-center{text-align:center}
.text-right{text-align:right}
.text-success{color:var(--success)}
.text-danger{color:var(--danger)}
.text-warning{color:var(--warning)}
.font-bold{font-weight:700}
.num{font-variant-numeric:tabular-nums}
.mono{font-family:var(--mono)}
.mt-1{margin-top:8px}.mt-2{margin-top:16px}.mt-3{margin-top:24px}
.mb-2{margin-bottom:16px}
.row-between{display:flex;justify-content:space-between;align-items:center;gap:16px;flex-wrap:wrap}
.flex-gap{display:flex;gap:8px;flex-wrap:wrap;align-items:center}
.grow{flex:1}
.span-full{grid-column:1/-1}
.sr-only{position:absolute;width:1px;height:1px;padding:0;margin:-1px;
  overflow:hidden;clip:rect(0 0 0 0);white-space:nowrap;border:0}
.skip-link{position:absolute;left:-9999px;top:0;background:var(--primary);
  color:#fff;padding:10px 16px;z-index:500;border-radius:0 0 var(--radius-sm) 0}
.skip-link:focus{left:0;top:0}
/* ---- navbar ---- */
.navbar{background:var(--surface);border-bottom:1px solid var(--border);position:sticky;top:0;z-index:50}
.navbar-content{max-width:1400px;margin:0 auto;padding:11px 24px;
  display:flex;justify-content:space-between;align-items:center;gap:16px;flex-wrap:wrap}
.navbar-brand{font-size:1.15rem;font-weight:700;color:var(--text);letter-spacing:-.02em}
.navbar-brand:hover{text-decoration:none}
.navbar-links{display:flex;align-items:center;gap:16px;flex-wrap:wrap}
.navbar-links a{color:var(--muted);font-size:.9rem}
.navbar-links a:hover{color:var(--text);text-decoration:none}
.navbar-links a.active{color:var(--primary);font-weight:600}
.navbar-user{font-size:.9rem;font-weight:500}
.credit-pill{display:inline-flex;align-items:center;gap:6px;background:var(--primary-soft);
  color:var(--primary);padding:4px 12px;border-radius:999px;font-size:.8rem;
  font-weight:600;white-space:nowrap}
.credit-pill.low{background:var(--warning-soft);color:var(--warning)}
.credit-pill.insufficient{background:var(--danger-soft);color:var(--danger)}
.theme-toggle{background:none;border:1px solid var(--border-strong);color:var(--muted);
  border-radius:var(--radius-sm);padding:4px 9px;cursor:pointer;font-size:.85rem;font-family:inherit}
.theme-toggle:hover{color:var(--text)}
.app-header{display:flex;justify-content:space-between;align-items:center;
  padding:12px 24px;background:var(--surface);border-bottom:1px solid var(--border)}
.app-brand{font-size:18px;font-weight:700;color:var(--text)}
.app-nav{display:flex;align-items:center;gap:16px}
.app-nav a{color:var(--muted);font-size:14px}
/* ---- layout ---- */
.container{max-width:1400px;margin:0 auto;padding:24px}
.container-narrow{max-width:860px;margin:0 auto;padding:28px 20px}
.card,.panel{background:var(--surface);border:1px solid var(--border);
  border-radius:var(--radius);box-shadow:var(--shadow)}
.card{padding:22px;margin-bottom:20px}
.panel{overflow:hidden}
.card-header{display:flex;justify-content:space-between;align-items:center;
  gap:16px;margin-bottom:18px;flex-wrap:wrap}
.grid{display:grid;grid-template-columns:repeat(auto-fit,minmax(280px,1fr));gap:20px}
.page-head{display:flex;flex-wrap:wrap;gap:12px;align-items:baseline;
  justify-content:space-between;margin-bottom:18px}
.page-head h1{font-size:1.4rem}
.count{color:var(--muted);font-size:.8rem;font-variant-numeric:tabular-nums}
.toolbar{display:flex;flex-wrap:wrap;gap:10px;margin-bottom:16px}
.toolbar .search{flex:1 1 260px;min-width:0}
.admin-links{display:flex;gap:10px;flex-wrap:wrap;margin-top:4px}
/* ---- auth ---- */
.auth-wrap{min-height:100vh;display:flex;align-items:center;justify-content:center;padding:24px}
.auth-box,.auth-card{width:100%;max-width:420px;background:var(--surface);
  border:1px solid var(--border);border-radius:12px;padding:36px 32px;box-shadow:var(--shadow)}
.auth-box h1{text-align:center;margin-bottom:4px}
.auth-box .sub,.auth-card .sub{text-align:center;color:var(--muted);font-size:.9rem;margin-bottom:26px}
.auth-links,.auth-foot{margin-top:20px;text-align:center;font-size:.88rem;color:var(--muted)}
/* ---- forms ---- */
.form-group{margin-bottom:16px}
label{display:block;margin-bottom:6px;font-size:.82rem;font-weight:500;color:var(--muted)}
label .req{color:var(--danger);font-weight:700}
input,select,textarea{width:100%;padding:10px 12px;background:var(--surface-2);
  border:1px solid var(--border-strong);border-radius:var(--radius-sm);color:var(--text);
  font-size:.95rem;font-family:inherit;transition:border-color .15s,box-shadow .15s}
input:focus,select:focus,textarea:focus{outline:none;border-color:var(--primary);
  box-shadow:0 0 0 3px var(--primary-soft)}
input::placeholder,textarea::placeholder{color:var(--muted)}
textarea{min-height:72px;resize:vertical}
input[type="radio"],input[type="checkbox"]{width:auto;margin-right:6px}
input[aria-invalid="true"]{border-color:var(--danger)}
input[aria-invalid="true"]:focus{box-shadow:0 0 0 3px var(--danger-soft)}
.hint,.form-group small{display:block;font-size:.74rem;color:var(--muted);margin-top:5px}
.field-error{color:var(--danger);font-size:.74rem;margin-top:5px;min-height:1em}
.filters{display:flex;gap:12px;flex-wrap:wrap;align-items:flex-end}
.filters .field{display:flex;flex-direction:column}
.pwd-wrap{position:relative}
.pwd-wrap input{padding-right:62px}
.btn-toggle-password{position:absolute;right:8px;bottom:6px;background:none;border:none;
  cursor:pointer;color:var(--muted);font-family:inherit;font-size:.78rem;
  font-weight:600;padding:6px 8px;border-radius:var(--radius-sm);line-height:1}
.btn-toggle-password:hover{color:var(--text);background:var(--surface-3)}
.password-strength{margin-top:8px;font-size:.74rem;color:var(--muted)}
.pw-meter{height:4px;border-radius:2px;background:var(--surface-3);overflow:hidden;margin-bottom:5px}
.pw-meter i{display:block;height:100%;width:0;border-radius:2px;transition:width .2s ease,background .2s ease}
.pw-0 i{width:12%;background:var(--danger)}
.pw-1 i{width:32%;background:var(--danger)}
.pw-2 i{width:56%;background:var(--warning)}
.pw-3 i{width:78%;background:var(--info)}
.pw-4 i{width:100%;background:var(--success)}
/* ---- buttons ---- */
.btn{display:inline-flex;align-items:center;justify-content:center;gap:7px;
  padding:9px 17px;border:1px solid transparent;border-radius:var(--radius-sm);
  font-size:.9rem;font-weight:500;font-family:inherit;cursor:pointer;white-space:nowrap;
  line-height:1.2;transition:background .15s,opacity .15s,transform .05s}
.btn:hover{text-decoration:none}
.btn:active:not(:disabled){transform:translateY(1px)}
.btn:disabled{opacity:.55;cursor:not-allowed}
.btn-full,.btn-block{width:100%;margin-top:8px}
.btn-sm{padding:4px 9px;font-size:.76rem}
.btn-primary{background:var(--primary);color:var(--on-primary)}
.btn-primary:hover:not(:disabled){background:var(--primary-hover)}
.btn-secondary{background:transparent;color:var(--text);border-color:var(--border-strong)}
.btn-secondary:hover:not(:disabled){background:var(--surface-3)}
.btn-danger,.btn-stop{background:var(--danger);color:#fff}
.btn-warning{background:var(--warning);color:#fff}
.btn-success{background:var(--success);color:#fff}
.btn-info{background:var(--info);color:#fff}
.btn-danger:hover:not(:disabled),.btn-warning:hover:not(:disabled),
.btn-success:hover:not(:disabled),.btn-info:hover:not(:disabled),.btn-stop:hover:not(:disabled){opacity:.87}
.logout-btn{background:transparent;color:var(--danger);border:1px solid var(--danger);
  padding:5px 13px;border-radius:var(--radius-sm);font-size:.85rem;cursor:pointer;font-family:inherit}
.logout-btn:hover{background:var(--danger);color:#fff}
/* ---- alerts ---- */
.error-message{color:var(--danger);font-size:.85rem;min-height:20px;margin-bottom:12px}
.error-message:not(:empty){background:var(--danger-soft);border-left:3px solid var(--danger);
  padding:9px 12px;border-radius:4px}
.success-message{color:var(--success);font-size:.85rem;margin-bottom:12px}
.success-message:not(:empty){background:var(--success-soft);border-left:3px solid var(--success);
  padding:9px 12px;border-radius:4px}
.msg{margin-top:12px;padding:10px 12px;border-radius:4px;font-size:.82rem;display:none}
.msg.show{display:block}
.msg-error{background:var(--danger-soft);color:var(--danger);border-left:4px solid var(--danger)}
.msg-success{background:var(--success-soft);color:var(--success);border-left:4px solid var(--success)}
.msg-warn{background:var(--warning-soft);color:var(--warning);border-left:4px solid var(--warning)}
.msg-info{background:var(--info-soft);color:var(--info);border-left:4px solid var(--info)}
.error{color:var(--danger);font-size:.82rem;margin-top:8px;display:block}
.success{color:var(--success);font-size:.82rem;margin-top:8px;display:block}
.warn-box{background:var(--warning-soft);color:var(--warning);padding:10px 12px;
  border-radius:4px;border-left:4px solid var(--warning);margin-bottom:12px;font-size:.8rem}
.error-banner{display:none;justify-content:space-between;align-items:center;gap:12px;
  background:var(--danger);color:#fff;padding:11px 20px;font-size:.9rem}
.error-banner.active{display:flex}
.banner{display:flex;gap:14px;align-items:center;justify-content:space-between;
  flex-wrap:wrap;padding:12px 18px;border-radius:var(--radius);margin-bottom:20px;font-size:.88rem}
.banner-warn{background:var(--warning-soft);color:var(--warning);border:1px solid var(--warning)}
.banner-danger{background:var(--danger-soft);color:var(--danger);border:1px solid var(--danger)}
/* ---- stats ---- */
.stats{display:grid;grid-template-columns:repeat(auto-fit,minmax(180px,1fr));gap:16px;margin-bottom:24px}
.stat-card{background:var(--surface);border:1px solid var(--border);border-radius:var(--radius);
  padding:20px;box-shadow:var(--shadow)}
.stat-card h4{color:var(--muted);text-transform:uppercase;letter-spacing:.06em;
  font-size:.68rem;margin-bottom:8px}
.stat-card .value{font-size:1.8rem;font-weight:700;line-height:1.15}
/* ---- tables ---- */
.table-wrap{overflow-x:auto;-webkit-overflow-scrolling:touch}
table{width:100%;border-collapse:collapse;font-size:.88rem}
th,td{padding:11px 12px;text-align:left;border-bottom:1px solid var(--border);vertical-align:middle}
th{color:var(--muted);font-weight:600;font-size:.7rem;text-transform:uppercase;
  letter-spacing:.05em;background:var(--surface-2);white-space:nowrap}
th.sortable{cursor:pointer;user-select:none;padding:0}
th.sortable button{width:100%;background:none;border:0;color:inherit;font:inherit;
  text-transform:inherit;letter-spacing:inherit;cursor:pointer;padding:11px 12px;
  text-align:left;display:flex;align-items:center;gap:6px}
th.sortable button:hover{color:var(--text)}
th.sortable .arrow{opacity:0;font-size:.6rem}
th[aria-sort] .arrow{opacity:1;color:var(--primary)}
th.num-col button{justify-content:flex-end}
th.num-col,td.num-col{text-align:right}
.actions-col{width:1%}
tbody tr:hover{background:var(--surface-2)}
tbody tr:last-child td{border-bottom:none}
tbody tr.clickable{cursor:pointer}
tbody tr.is-busy{opacity:.45;pointer-events:none}
td.num{text-align:right;font-variant-numeric:tabular-nums}
.actions{display:flex;gap:4px;flex-wrap:wrap;justify-content:flex-end}
.history-table th,.history-table td{padding:6px 8px;font-size:.78rem}
.history-table .ua{max-width:230px;overflow:hidden;text-overflow:ellipsis;white-space:nowrap}
tr.row-fail{background:var(--danger-soft)}
.pagination{display:flex;justify-content:center;align-items:center;gap:10px;
  margin-top:18px;font-size:.85rem;color:var(--muted)}
.icon-btn{background:none;border:1px solid transparent;color:var(--muted);
  border-radius:var(--radius-sm);cursor:pointer;font-size:.95rem;line-height:1;
  padding:5px 9px;opacity:0}
tr:hover .icon-btn,.icon-btn:focus-visible{opacity:1}
.icon-btn:hover{color:var(--danger);background:var(--danger-soft);border-color:var(--danger)}
.title-link{font-weight:500;text-decoration:none;display:inline-block;margin-bottom:3px;color:var(--text)}
.title-link:hover{color:var(--primary);text-decoration:none}
.row-meta{display:none;margin-top:8px;gap:8px;align-items:center;flex-wrap:wrap}
/* ---- badges ---- */
.badge{display:inline-block;padding:3px 10px;border-radius:999px;font-size:.72rem;
  font-weight:600;text-transform:capitalize}
.badge-admin{background:var(--primary-soft);color:var(--primary)}
.badge-user{background:var(--surface-3);color:var(--muted)}
.badge-active{background:var(--success-soft);color:var(--success)}
.badge-suspended{background:var(--danger-soft);color:var(--danger)}
.badge-pending{background:var(--warning-soft);color:var(--warning)}
.model-tag{display:inline-block;padding:2px 8px;background:var(--primary-soft);
  color:var(--primary);border-radius:4px;font-size:.72rem;font-family:var(--mono)}
/* ---- modal ---- */
.modal{display:none;position:fixed;inset:0;background:rgba(0,0,0,.55);
  z-index:200;justify-content:center;align-items:center;padding:20px}
.modal.active{display:flex}
.modal-content{background:var(--surface);border:1px solid var(--border);border-radius:12px;
  padding:24px;width:100%;max-width:480px;max-height:90vh;overflow-y:auto;box-shadow:var(--shadow-lg)}
.modal-content.wide{max-width:760px}
.modal-header{display:flex;justify-content:space-between;align-items:center;margin-bottom:16px}
.modal-close{background:none;border:none;color:var(--muted);font-size:1.5rem;
  line-height:1;cursor:pointer;padding:0 4px}
.modal-close:hover{color:var(--text)}
.modal-actions{display:flex;gap:10px;justify-content:flex-end;margin-top:20px}
.user-info{background:var(--surface-2);padding:12px;border-radius:var(--radius-sm);
  margin-bottom:14px;font-size:.85rem}
.user-info p{margin:3px 0}
.temp-pw{background:var(--info-soft);color:var(--info);padding:12px;border-radius:4px;
  font-family:var(--mono);font-size:1rem;word-break:break-all;text-align:center;
  margin:12px 0;font-weight:700}
/* ---- chat ---- */
.credit-bar{background:var(--surface);border-bottom:1px solid var(--border);
  padding:9px 24px;display:flex;justify-content:space-between;align-items:center;
  gap:12px;font-size:.84rem;color:var(--muted);flex-wrap:wrap}
.credit-bar select{width:auto;min-width:200px;padding:5px 9px;font-size:.82rem}
.chat-shell{display:flex;gap:18px;height:calc(100vh - 62px - 46px - 40px);min-height:460px}
.chat-sidebar{width:260px;flex-shrink:0;background:var(--surface);border:1px solid var(--border);
  border-radius:var(--radius);padding:18px;display:flex;flex-direction:column;overflow:hidden}
.chat-sidebar h3{margin-bottom:12px;font-size:.95rem}
.chat-history{margin-top:14px;overflow-y:auto;flex:1;font-size:.84rem}
.chat-history a{display:block;padding:7px 9px;border-radius:var(--radius-sm);
  color:var(--muted);margin-bottom:3px;overflow:hidden;text-overflow:ellipsis;white-space:nowrap}
.chat-history a:hover{background:var(--surface-3);color:var(--text);text-decoration:none}
.chat-main{flex:1;display:flex;flex-direction:column;background:var(--surface);
  border:1px solid var(--border);border-radius:var(--radius);overflow:hidden;min-width:0}
.chat-messages{flex:1;overflow-y:auto;padding:22px}
.chat-input-area{padding:14px 18px;border-top:1px solid var(--border);
  display:flex;gap:10px;align-items:flex-end}
.chat-input-area textarea{flex:1;min-height:44px;max-height:180px;resize:none;
  padding:11px 12px;line-height:1.45}
.input-hint{padding:0 18px 10px;font-size:.72rem;color:var(--muted)}
.input-hint kbd{font-family:var(--mono);font-size:.9em;background:var(--surface-3);
  border:1px solid var(--border);border-radius:3px;padding:1px 4px}
.typing{display:none;padding:0 22px 12px;color:var(--muted);font-style:italic;font-size:.85rem}
.typing.active{display:block}
.chat-msg{display:flex;margin-bottom:18px}
.chat-msg.user{justify-content:flex-end}
.chat-msg.assistant,.chat-msg.system{justify-content:flex-start}
.chat-msg .wrapper{display:flex;flex-direction:column;max-width:78%;min-width:0}
.chat-msg.user .wrapper{align-items:flex-end}
.bubble{padding:11px 15px;border-radius:12px;line-height:1.55;font-size:.94rem;
  word-wrap:break-word;overflow-wrap:anywhere;white-space:pre-wrap}
.bubble.md,.md{white-space:normal}
.chat-msg.user .bubble{background:var(--primary);color:var(--on-primary);border-bottom-right-radius:4px}
.chat-msg.assistant .bubble{background:var(--surface-2);border:1px solid var(--border);
  border-bottom-left-radius:4px}
.chat-msg.system .bubble{background:transparent;border:1px dashed var(--border);
  color:var(--muted);font-style:italic;font-size:.82rem}
.chat-msg.failed .bubble{border-color:var(--danger);color:var(--danger)}
.chat-msg.pending .bubble{opacity:.78}
.msg-meta{font-size:.68rem;color:var(--muted);margin-top:5px;
  text-transform:uppercase;letter-spacing:.05em}
.chat-msg.user .msg-meta{text-align:right}
.msg-tools{display:flex;gap:6px;margin-top:5px;opacity:0;transition:opacity .12s}
.chat-msg:hover .msg-tools,.msg-tools:focus-within{opacity:1}
.chat-msg.user .msg-tools{justify-content:flex-end}
.msg-copy{background:none;border:1px solid var(--border);color:var(--muted);
  border-radius:var(--radius-sm);font-size:.66rem;padding:2px 7px;
  cursor:pointer;font-family:inherit;line-height:1.5}
.msg-copy:hover{color:var(--text);background:var(--surface-3)}
.conv-item{display:flex;align-items:center;gap:4px;border-radius:var(--radius-sm);padding-left:9px}
.conv-item:hover{background:var(--surface-3)}
.conv-item.active{background:var(--primary-soft)}
.conv-item a{flex:1 1 auto;min-width:0;padding:7px 0;color:var(--muted);
  white-space:nowrap;overflow:hidden;text-overflow:ellipsis;font-size:.84rem}
.conv-item:hover a{color:var(--text);text-decoration:none}
.conv-item.active a{color:var(--primary);font-weight:600}
.conv-delete{flex:0 0 auto;background:none;border:0;color:var(--muted);cursor:pointer;
  font-size:1rem;line-height:1;padding:5px 7px;border-radius:4px;opacity:0}
.conv-item:hover .conv-delete,.conv-delete:focus-visible{opacity:1}
.conv-delete:hover{color:var(--danger)}
.conv-empty{color:var(--muted);font-size:.84rem}
/* ---- conversations / detail ---- */
.conv-title{font-weight:500;margin-bottom:3px}
.conv-preview{color:var(--muted);font-size:.8rem;line-height:1.4;
  display:-webkit-box;-webkit-line-clamp:2;-webkit-box-orient:vertical;overflow:hidden}
.meta-bar{display:flex;gap:16px;align-items:center;flex-wrap:wrap;margin-bottom:22px;
  padding:12px 16px;background:var(--surface);border:1px solid var(--border);
  border-radius:var(--radius);font-size:.8rem;color:var(--muted)}
.empty,.state{padding:56px 20px;text-align:center;color:var(--muted)}
.state p{margin:0 0 14px}
.state .sub{font-size:.82rem}
.detail-head{display:flex;justify-content:space-between;align-items:flex-start;
  gap:16px;flex-wrap:wrap;margin-bottom:8px}
.detail-title{font-size:1.25rem;font-weight:600;line-height:1.3;margin:0;overflow-wrap:anywhere}
.back-link{font-size:.82rem;color:var(--muted);display:inline-block;margin-bottom:6px}
.back-link:hover{color:var(--primary);text-decoration:none}
.thread{padding-top:4px}
.jump-end{position:fixed;right:22px;bottom:22px;z-index:60;box-shadow:var(--shadow-lg)}
.list-item{display:block;padding:12px 14px;border:1px solid var(--border);
  border-radius:var(--radius-sm);margin-bottom:8px;color:inherit}
.list-item:hover{background:var(--surface-2);text-decoration:none}
.list-item .li-title{font-weight:500;margin-bottom:3px}
.list-item .li-meta{font-size:.75rem;color:var(--muted)}
.footer-bar{display:flex;justify-content:center;padding:16px}
.sk-row{display:flex;gap:20px;padding:16px 20px;border-bottom:1px solid var(--border)}
.sk-row:last-child{border-bottom:none}
.skeleton{display:inline-block;min-width:64px;height:.9em;border-radius:4px;vertical-align:middle;
  background:linear-gradient(90deg,var(--surface-3) 25%,var(--surface-2) 50%,var(--surface-3) 75%);
  background-size:200% 100%;animation:shimmer 1.3s linear infinite}
@keyframes shimmer{0%{background-position:200% 0}100%{background-position:-200% 0}}
/* ---- spinner / toast ---- */
.spinner{display:inline-block;width:14px;height:14px;border:2px solid rgba(128,128,128,.35);
  border-top-color:currentColor;border-radius:50%;animation:spin .7s linear infinite}
@keyframes spin{to{transform:rotate(360deg)}}
#toastHost{position:fixed;bottom:22px;right:22px;display:flex;flex-direction:column;gap:10px;z-index:300}
.toast{background:var(--surface);color:var(--text);border:1px solid var(--border);
  border-left:4px solid var(--primary);border-radius:var(--radius-sm);padding:12px 16px;
  box-shadow:var(--shadow-lg);font-size:.86rem;max-width:340px;animation:slideIn .2s ease-out}
.toast-success{border-left-color:var(--success)}
.toast-error{border-left-color:var(--danger)}
.toast-warn{border-left-color:var(--warning)}
@keyframes slideIn{from{opacity:0;transform:translateX(20px)}to{opacity:1;transform:none}}
/* ---- markdown (h2-h6 only; h1 hidden if a bug ever emits it) ---- */
.md>*:first-child{margin-top:0}
.md>*:last-child{margin-bottom:0}
.md p{margin:0 0 10px}
.md h1{display:none}
.md h2,.md h3,.md h4,.md h5,.md h6{margin:14px 0 8px;line-height:1.25;font-weight:600}
.md h2{font-size:1.24em}
.md h3{font-size:1.14em}
.md h4{font-size:1.05em}
.md h5{font-size:1em}
.md h6{font-size:.94em;color:var(--muted)}
.md ul,.md ol{margin:0 0 10px;padding-left:22px}
.md li{margin:3px 0}
.md blockquote{margin:0 0 10px;padding:2px 0 2px 12px;
  border-left:3px solid var(--border-strong);color:var(--muted)}
.md hr{border:0;border-top:1px solid var(--border);margin:14px 0}
.md a{text-decoration:underline}
.md code{font-family:var(--mono);font-size:.88em;background:var(--surface-3);
  padding:1px 5px;border-radius:4px}
.md pre{position:relative;margin:0 0 10px;padding:12px 14px;background:var(--surface-3);
  border:1px solid var(--border);border-radius:8px;overflow-x:auto}
.md pre code{background:none;padding:0;font-size:.85em;line-height:1.5}
.md .copy-code{position:absolute;top:6px;right:6px;background:var(--surface);
  border:1px solid var(--border);border-radius:4px;color:var(--muted);
  font-size:.68rem;padding:3px 7px;cursor:pointer;opacity:0;font-family:inherit}
.md pre:hover .copy-code,.md .copy-code:focus-visible{opacity:1}
.md .copy-code:hover{color:var(--text)}
.chat-msg.user .md a{color:inherit;text-decoration:underline}
.chat-msg.user .md code,.chat-msg.user .md pre{background:rgba(255,255,255,.18);
  border-color:rgba(255,255,255,.25)}
/* ---- landing ---- */
.landing{min-height:100vh;display:flex;flex-direction:column}
.landing-nav{display:flex;justify-content:space-between;align-items:center;
  gap:16px;padding:16px 24px;max-width:1100px;margin:0 auto;width:100%}
.landing-nav .brand{font-size:1.1rem;font-weight:700;color:var(--text);letter-spacing:-.02em}
.landing-nav .brand:hover{text-decoration:none}
.hero{flex:1;display:flex;flex-direction:column;align-items:center;
  justify-content:center;text-align:center;padding:56px 24px 40px;
  max-width:760px;margin:0 auto}
.hero-title{font-size:clamp(2.5rem,9vw,4rem);font-weight:800;letter-spacing:-.03em;
  line-height:1.04;margin-bottom:16px;color:var(--primary)}
@supports ((-webkit-background-clip:text) or (background-clip:text)){
  .hero-title{
    background:linear-gradient(135deg,var(--primary),var(--info));
    -webkit-background-clip:text;background-clip:text;
    -webkit-text-fill-color:transparent;color:transparent}
}
.hero-sub{font-size:clamp(1rem,2.6vw,1.2rem);color:var(--muted);
  max-width:54ch;margin:0 auto 30px;line-height:1.6}
.hero-actions{display:flex;gap:14px;flex-wrap:wrap;justify-content:center}
.hero-actions .btn{padding:13px 28px;font-size:1rem}
.hero-note{margin-top:18px;font-size:.8rem;color:var(--muted)}
.features{display:grid;grid-template-columns:repeat(auto-fit,minmax(215px,1fr));
  gap:20px;max-width:980px;margin:0 auto;padding:0 24px 56px;text-align:left}
.feature{background:var(--surface);border:1px solid var(--border);
  border-radius:var(--radius);padding:20px}
.feature h2{font-size:.95rem;font-weight:600;margin-bottom:7px}
.feature p{font-size:.85rem;color:var(--muted);line-height:1.6}
.site-footer{border-top:1px solid var(--border);padding:20px 24px;
  text-align:center;font-size:.78rem;color:var(--muted)}
/* ---- responsive ---- */
@media (max-width:860px){
  .chat-shell{flex-direction:column;height:auto}
  .chat-sidebar{width:100%;max-height:320px}
  .chat-messages{min-height:52vh}
}
@media (max-width:768px){
  .container,.container-narrow{padding:16px}
  .navbar-content{padding:10px 16px}
  .navbar-links{gap:12px;font-size:.85rem}
  .card{padding:17px}
  .auth-box,.auth-card{padding:28px 22px}
  .stat-card .value{font-size:1.45rem}
  .chat-msg .wrapper{max-width:90%}
  .hide-mobile{display:none}
  .modal-content{padding:18px}
}
@media (max-width:720px){
  .hide-mobile{display:none}
  .row-meta{display:flex}
  .icon-btn{opacity:1}
}
@media (max-width:640px){
  .hero{padding:36px 20px 28px}
  .hero-actions{flex-direction:column;width:100%;max-width:300px}
  .hero-actions .btn{width:100%}
  .msg-tools{opacity:1}
}
@media (hover:none){
  .md .copy-code,.conv-delete,.icon-btn,.msg-tools{opacity:1}
}
@media (prefers-reduced-motion:reduce){
  .spinner,.skeleton,.toast,.btn{animation:none;transition:none}
}
@media (forced-colors:active){
  .hero-title{background:none;-webkit-text-fill-color:currentColor;color:CanvasText}
  .btn-primary,.credit-pill,.badge{border:1px solid ButtonText}
}
/* PWA standalone + A2HS */
html{padding:env(safe-area-inset-top) env(safe-area-inset-right) env(safe-area-inset-bottom) env(safe-area-inset-left)}
@media (display-mode: standalone){
  .skip-link{display:none}
}
#pwaInstallBar{position:fixed;left:0;right:0;bottom:0;z-index:250;
  padding:12px 16px calc(12px + env(safe-area-inset-bottom));
  background:var(--surface);border-top:1px solid var(--border);box-shadow:var(--shadow-lg)}
.pwa-install-inner{max-width:720px;margin:0 auto;display:flex;gap:12px;align-items:center;justify-content:space-between;flex-wrap:wrap}
.pwa-install-inner p{margin:0;font-size:.88rem;flex:1 1 200px}
.pwa-install-actions{display:flex;gap:8px}

/* account menu: secondary nav lives under username */

.navbar-links > a[href$="dashboard.html"],

.navbar-links > a[href$="conversations.html"],

.navbar-links > a[href$="conversation-detail.html"],

.navbar-links > a[href$="change-password.html"],

.navbar-links > .theme-toggle,

.navbar-links > .logout-btn {

  display: none !important;

}

.user-menu{position:relative;display:inline-flex;align-items:center}

.user-menu-btn{background:none;border:0;color:inherit;cursor:pointer;font:inherit;padding:4px 8px;border-radius:8px}

.user-menu-btn:hover,.user-menu-btn[aria-expanded="true"]{background:var(--surface-2,#e5e7eb)}

.user-menu-drop{position:absolute;right:0;top:calc(100% + 6px);min-width:200px;background:var(--surface,#fff);border:1px solid var(--border,#e5e7eb);border-radius:10px;box-shadow:0 8px 24px rgba(0,0,0,.12);padding:6px;z-index:80;display:none;flex-direction:column}

.user-menu-drop.open{display:flex}

.user-menu-drop a,.user-menu-drop button{display:block;width:100%;text-align:left;background:none;border:0;color:inherit;font:inherit;padding:8px 10px;border-radius:8px;cursor:pointer;text-decoration:none}

.user-menu-drop a:hover,.user-menu-drop button:hover{background:var(--surface-2,#f3f4f6)}