:root {
  --ink: #14213d;
  --ink-2: #233357;
  --paper: #f6f3ed;
  --white: #fffdf9;
  --line: #ded8cc;
  --muted: #6d7280;
  --accent: #d99445;
  --danger: #a43f3f;
  --success: #2f7550;
  --shadow: 0 18px 60px rgba(20, 33, 61, .12);
  font-family: Inter, ui-sans-serif, system-ui, -apple-system, BlinkMacSystemFont, "Segoe UI", "PingFang SC", "Microsoft YaHei", sans-serif;
  color: var(--ink);
  background: var(--paper);
}
* { box-sizing: border-box; }
html, body { margin: 0; min-height: 100%; }
button, input, textarea { font: inherit; }
button, a { -webkit-tap-highlight-color: transparent; }
button { cursor: pointer; }
a { color: inherit; }
.eyebrow { margin: 0 0 .65rem; color: var(--accent); font: 700 .7rem/1.2 ui-monospace, SFMono-Regular, Menlo, monospace; letter-spacing: .16em; }
.muted { color: var(--muted); }
.brand-mark { width: 3.25rem; height: 3.25rem; display: grid; place-items: center; border: 1px solid rgba(255,255,255,.28); border-radius: 50%; color: var(--white); font: 700 .85rem/1 ui-monospace, monospace; letter-spacing: .12em; }
.brand-mark.small { width: 2.4rem; height: 2.4rem; font-size: .7rem; background: var(--ink); flex: none; }
.primary { border: 0; border-radius: .7rem; padding: .8rem 1.15rem; background: var(--ink); color: white; font-weight: 700; }
.primary:hover { background: var(--ink-2); }
.primary:disabled { opacity: .5; cursor: default; }
.link-button { border: 0; padding: 0; background: none; color: inherit; }
.toast { position: fixed; z-index: 99; left: 50%; bottom: 1.5rem; transform: translate(-50%, 1rem); max-width: min(90vw, 38rem); padding: .8rem 1.1rem; border-radius: .7rem; background: var(--ink); color: white; box-shadow: var(--shadow); opacity: 0; pointer-events: none; transition: .2s ease; }
.toast.show { opacity: 1; transform: translate(-50%, 0); }

.auth-page { background: var(--ink); }
.auth-shell { min-height: 100vh; display: grid; grid-template-columns: minmax(24rem, 1fr) minmax(28rem, .85fr); }
.auth-intro { display: flex; flex-direction: column; justify-content: center; padding: 8vw; color: white; background: radial-gradient(circle at 30% 20%, #31446d 0, transparent 35%), linear-gradient(145deg, #14213d, #0d172c); }
.auth-intro .brand-mark { margin-bottom: 16vh; }
.auth-intro h1 { margin: 0; max-width: 13ch; font: 500 clamp(2.8rem, 5vw, 5rem)/1.04 Georgia, "Songti SC", serif; letter-spacing: -.035em; }
.auth-intro > p:last-child { max-width: 34rem; margin: 2rem 0 0; color: #bdc7db; line-height: 1.8; }
.auth-card { align-self: center; justify-self: center; width: min(28rem, 80%); padding: 3rem; border-radius: 1.25rem; background: var(--white); box-shadow: var(--shadow); }
.auth-card h2 { margin: 0; font: 500 2rem/1.2 Georgia, "Songti SC", serif; }
.auth-card .muted { margin-bottom: 2rem; }
.stack { display: grid; gap: 1.2rem; margin-top: 2rem; }
label { display: grid; gap: .45rem; color: var(--ink-2); font-size: .88rem; font-weight: 650; }
input, textarea { width: 100%; border: 1px solid var(--line); border-radius: .65rem; padding: .8rem .9rem; background: white; color: var(--ink); outline: none; }
input:focus, textarea:focus { border-color: var(--accent); box-shadow: 0 0 0 3px rgba(217,148,69,.15); }
.form-error { margin: 0; color: var(--danger); font-size: .88rem; }

.workspace-page { height: 100vh; height: 100dvh; overflow: hidden; }
.workspace { height: 100vh; height: 100dvh; min-height: 0; display: grid; grid-template-columns: 17rem minmax(25rem, 1fr) 19rem; background: var(--white); }
.workspace > * { min-height: 0; }
.sidebar { min-width: 0; display: flex; flex-direction: column; padding: 1.25rem; background: var(--ink); color: #e9edf6; }
.brand { display: flex; align-items: center; gap: .75rem; }
.brand div:last-child { display: grid; gap: .2rem; }
.brand span { color: #8996b0; font: 600 .57rem/1 ui-monospace, monospace; letter-spacing: .08em; }
.new-chat { margin: 2rem 0 1rem; padding: .72rem; border: 1px solid #506080; border-radius: .65rem; color: white; background: transparent; text-align: left; }
.new-chat:hover { border-color: var(--accent); }
.chat-list { display: grid; gap: .3rem; overflow-y: auto; }
.chat-list-item { display: grid; grid-template-columns: minmax(0, 1fr) 2rem; align-items: center; border-radius: .55rem; }
.chat-list-item:hover, .chat-list-item.active { background: rgba(255,255,255,.09); }
.chat-list-item button { border: 0; background: transparent; color: #aeb8cb; }
.chat-select { overflow: hidden; padding: .72rem; text-align: left; text-overflow: ellipsis; white-space: nowrap; }
.chat-list-item:hover .chat-select, .chat-list-item.active .chat-select { color: white; }
.chat-archive { align-self: stretch; border-radius: .45rem; color: #8996b0; font-size: 1rem; opacity: 0; }
.chat-list-item:hover .chat-archive, .chat-list-item:focus-within .chat-archive { opacity: 1; }
.chat-archive:hover { background: rgba(164,63,63,.25); color: #ffd7d7; }
.sidebar-footer { margin-top: auto; }
.usage-card { display: grid; gap: .7rem; padding: 1rem; border: 1px solid #354563; border-radius: .8rem; }
.usage-card div { display: flex; justify-content: space-between; gap: .5rem; font-size: .72rem; color: #9eabc0; }
.usage-card strong { color: white; }
.user-row { display: flex; gap: .8rem; align-items: center; margin-top: 1rem; color: #9eabc0; font-size: .78rem; }
.user-row span { margin-right: auto; color: white; }
.chat-panel { min-width: 0; min-height: 0; display: grid; grid-template-rows: auto minmax(0, 1fr) auto; overflow: hidden; background: #faf9f6; }
.topbar { min-height: 5.25rem; display: flex; align-items: center; gap: 1rem; padding: 1rem 1.5rem; border-bottom: 1px solid var(--line); background: rgba(255,253,249,.92); }
.topbar h1 { margin: 0; font-size: 1rem; }
.topbar p { margin: .25rem 0 0; color: var(--muted); font-size: .72rem; }
.topbar > div { flex: 1; }
.icon-button { display: none; border: 0; background: none; font-size: 1.25rem; }
.danger-ghost { padding: .55rem .8rem; border: 1px solid #d5aaaa; border-radius: .5rem; background: #fff8f7; color: var(--danger); }
.messages { min-height: 0; overflow-y: auto; overscroll-behavior: contain; padding: clamp(1.5rem, 5vw, 4.5rem) max(1.5rem, calc((100% - 48rem) / 2)); scroll-behavior: smooth; }
.empty-state { margin: 6vh auto; max-width: 42rem; text-align: center; }
.empty-state h2 { margin: .5rem 0; font: 500 clamp(2rem, 4vw, 3.3rem)/1.15 Georgia, "Songti SC", serif; }
.empty-state > p:not(.eyebrow) { color: var(--muted); }
.empty-state.simple { text-align: left; margin-top: 16vh; }
.prompt-grid { display: grid; grid-template-columns: 1fr 1fr; gap: .8rem; margin-top: 2.5rem; text-align: left; }
.prompt-grid button { padding: 1rem; border: 1px solid var(--line); border-radius: .75rem; background: var(--white); color: var(--ink); font: 700 .8rem/1.5 ui-monospace, monospace; }
.prompt-grid button:hover { transform: translateY(-1px); border-color: var(--accent); box-shadow: 0 8px 24px rgba(20,33,61,.07); }
.prompt-grid span { color: var(--muted); font: 400 .76rem/1.5 sans-serif; }
.message { display: grid; grid-template-columns: 3.2rem minmax(0,1fr); gap: 1rem; margin-bottom: 2rem; line-height: 1.75; }
.message > span { padding-top: .15rem; color: var(--muted); font-size: .72rem; font-weight: 700; text-transform: uppercase; }
.message-body { min-width: 0; white-space: pre-wrap; overflow-wrap: anywhere; }
.message.user .message-body { font-weight: 580; }
.message-body.markdown-body { white-space: normal; }
.message.pending .message-body { color: var(--muted); }
.message.error .message-body { color: var(--danger); }
.composer { margin: 0 auto 1.5rem; width: min(calc(100% - 3rem), 50rem); border: 1px solid var(--line); border-radius: 1rem; background: white; box-shadow: 0 10px 35px rgba(20,33,61,.08); overflow: hidden; }
.composer textarea { min-height: 4.5rem; max-height: 14rem; resize: vertical; border: 0; box-shadow: none; }
.composer-actions { display: flex; align-items: center; justify-content: space-between; padding: .5rem .65rem; color: var(--muted); font-size: .68rem; }
.round { border-radius: 2rem; padding: .6rem 1.1rem; }
.files-panel { min-width: 0; padding: 1.5rem 1rem; border-left: 1px solid var(--line); overflow-y: auto; background: var(--white); }
.files-panel h2 { margin: 0; font: 500 1.35rem/1.2 Georgia, serif; }
.upload-zone { margin: 1.5rem 0; padding: 1.25rem .8rem; border: 1px dashed #c8bdab; border-radius: .8rem; text-align: center; }
.upload-zone button { border: 0; background: none; color: var(--ink); font-weight: 700; }
.upload-zone p { margin: .5rem 0 0; color: var(--muted); font-size: .65rem; }
.file-list { display: grid; gap: .3rem; }
.file-list article { display: grid; grid-template-columns: 2.3rem minmax(0,1fr); align-items: center; gap: .7rem; padding: .7rem .5rem; border-radius: .5rem; }
.file-list article:hover { background: var(--paper); }
.file-icon { display: grid; place-items: center; height: 2.3rem; border-radius: .4rem; background: #ede7db; color: var(--ink-2); font: 700 .55rem/1 ui-monospace, monospace; }
.file-list article > div { min-width: 0; }
.file-list strong { display: block; overflow: hidden; font-size: .75rem; text-overflow: ellipsis; white-space: nowrap; }
.file-list small { color: var(--muted); font-size: .65rem; }
.file-actions { grid-column: 2; display: flex; gap: .6rem; font-size: .68rem; color: var(--muted); }
.empty-files { padding: 1rem; font-size: .75rem; }

.markdown-body { min-width: 0; color: var(--ink); line-height: 1.75; overflow-wrap: anywhere; }
.markdown-body > :first-child { margin-top: 0; }
.markdown-body > :last-child { margin-bottom: 0; }
.markdown-body p { margin: .75rem 0; }
.markdown-body h1, .markdown-body h2, .markdown-body h3, .markdown-body h4, .markdown-body h5, .markdown-body h6 { margin: 1.65rem 0 .65rem; color: var(--ink); line-height: 1.3; }
.markdown-body h1 { font-size: 1.7rem; }
.markdown-body h2 { padding-bottom: .35rem; border-bottom: 1px solid var(--line); font-size: 1.4rem; }
.markdown-body h3 { font-size: 1.15rem; }
.markdown-body h4, .markdown-body h5, .markdown-body h6 { font-size: 1rem; }
.markdown-body ul, .markdown-body ol { margin: .75rem 0; padding-left: 1.6rem; }
.markdown-body li + li { margin-top: .25rem; }
.markdown-body blockquote { margin: 1rem 0; padding: .1rem 1rem; border-left: .25rem solid var(--accent); color: var(--muted); background: rgba(217,148,69,.07); }
.markdown-body code { padding: .12rem .35rem; border-radius: .3rem; background: #ece8e0; color: #8d3541; font: .88em/1.5 ui-monospace, SFMono-Regular, Menlo, Consolas, monospace; }
.markdown-body pre { max-width: 100%; margin: 1rem 0; padding: 1rem; border-radius: .7rem; overflow: auto; background: #17233d; color: #eef2fa; }
.markdown-body pre code { padding: 0; background: transparent; color: inherit; white-space: pre; }
.markdown-body a { color: #315f9f; text-decoration-thickness: .08em; text-underline-offset: .16em; }
.markdown-body hr { margin: 1.5rem 0; border: 0; border-top: 1px solid var(--line); }
.markdown-table-wrap { max-width: 100%; margin: 1rem 0; overflow-x: auto; }
.markdown-body table { min-width: 24rem; background: var(--white); }
.markdown-body th, .markdown-body td { padding: .6rem .75rem; }

.preview-page { min-height: 100vh; background: var(--paper); }
.preview-shell { width: min(58rem, calc(100% - 2rem)); margin: 0 auto; padding: 3rem 0 6rem; }
.preview-header { display: flex; align-items: center; justify-content: space-between; gap: 2rem; margin-bottom: 1.5rem; }
.preview-header h1 { margin: 0; font: 500 clamp(1.6rem, 4vw, 2.5rem)/1.2 Georgia, "Songti SC", serif; overflow-wrap: anywhere; }
.preview-header nav { display: flex; align-items: center; gap: 1rem; flex: none; font-size: .8rem; }
.preview-header nav a { text-decoration: none; }
.preview-header .primary { padding: .65rem 1rem; }
.preview-content { min-height: 18rem; padding: clamp(1.5rem, 5vw, 3.5rem); border: 1px solid var(--line); border-radius: 1rem; background: var(--white); box-shadow: var(--shadow); }
.preview-error { padding: 2rem; border: 1px solid #d5aaaa; border-radius: .8rem; background: #fff8f7; color: var(--danger); }

.admin-page { min-height: 100vh; background: var(--paper); }
.admin-header { height: 4.75rem; display: flex; justify-content: space-between; align-items: center; padding: 0 max(1.25rem, 5vw); border-bottom: 1px solid var(--line); background: var(--white); }
.brand.inline { display: flex; align-items: center; gap: .75rem; text-decoration: none; }
.admin-header nav { display: flex; gap: 1.2rem; font-size: .82rem; }
.admin-main { width: min(78rem, calc(100% - 2rem)); margin: 0 auto; padding-bottom: 5rem; }
.admin-hero { padding: 5rem 0 3rem; }
.admin-hero h1 { margin: 0; font: 500 clamp(2.3rem, 5vw, 4.8rem)/1.05 Georgia, "Songti SC", serif; letter-spacing: -.035em; }
.admin-hero > p:last-child { color: var(--muted); }
.metric-row { display: grid; grid-template-columns: repeat(3,1fr); gap: 1rem; }
.metric-row article { display: grid; gap: 1rem; padding: 1.4rem; border: 1px solid var(--line); border-radius: .9rem; background: var(--white); }
.metric-row span { color: var(--muted); font-size: .75rem; }
.metric-row strong { font: 500 2.2rem/1 Georgia, serif; }
.admin-section { margin-top: 3rem; }
.section-heading { display: flex; align-items: end; justify-content: space-between; margin-bottom: 1rem; }
.section-heading h2 { margin: 0; font: 500 1.75rem/1.1 Georgia, serif; }
.table-wrap { overflow-x: auto; border: 1px solid var(--line); border-radius: .8rem; background: var(--white); }
table { width: 100%; border-collapse: collapse; font-size: .78rem; }
th, td { padding: 1rem; border-bottom: 1px solid #ece7de; text-align: left; vertical-align: middle; }
th { color: var(--muted); font-size: .68rem; letter-spacing: .06em; text-transform: uppercase; }
td small { display: block; margin-top: .25rem; color: var(--muted); }
tbody tr:last-child td { border-bottom: 0; }
.badge { display: inline-block; padding: .28rem .5rem; border-radius: 2rem; background: #ede7db; font-size: .67rem; }
.badge.success { background: #e1f0e7; color: var(--success); }
.badge.muted-badge { background: #eee; color: var(--muted); }
.row-actions { display: flex; flex-wrap: wrap; gap: .55rem; }
.row-actions button { padding: 0; border: 0; background: none; color: var(--ink-2); font-size: .72rem; }
.row-actions .danger-text { color: var(--danger); }
.job-error { min-width: 14rem; max-width: 28rem; color: var(--danger); line-height: 1.5; overflow-wrap: anywhere; }
.audit-list { border: 1px solid var(--line); border-radius: .8rem; background: var(--white); }
.audit-list article { display: grid; grid-template-columns: 1rem 1fr auto; gap: .7rem; padding: .8rem 1rem; border-bottom: 1px solid #ece7de; font-size: .75rem; }
.audit-list article:last-child { border: 0; }
.audit-list article > span { color: var(--accent); }
.audit-list small { margin-left: .7rem; color: var(--muted); }
.audit-list time { color: var(--muted); }
dialog { width: min(30rem, calc(100% - 2rem)); padding: 0; border: 0; border-radius: 1rem; box-shadow: var(--shadow); }
dialog::backdrop { background: rgba(13,23,44,.6); backdrop-filter: blur(3px); }
.dialog-card { display: grid; gap: 1rem; padding: 2rem; background: var(--white); }
.dialog-card h2 { margin: 0; font: 500 1.8rem/1.1 Georgia, serif; }
.dialog-message { margin: 0; color: var(--muted); line-height: 1.7; }
.dialog-fields { display: grid; gap: 1rem; }
.dialog-card code { display: block; padding: 1rem; border-radius: .5rem; background: var(--ink); color: white; overflow-wrap: anywhere; }
.dialog-actions { display: flex; justify-content: end; gap: .7rem; margin-top: .5rem; }
.dialog-actions > button:not(.primary), .dialog-card > button:not(.primary) { border: 1px solid var(--line); border-radius: .6rem; padding: .7rem 1rem; background: white; }
.danger-button { background: var(--danger); }
.danger-button:hover { background: #843131; }

@media (max-width: 1100px) {
  .workspace { grid-template-columns: 16rem minmax(0,1fr); }
  .files-panel { display: none; }
}
@media (max-width: 800px) {
  .auth-shell { grid-template-columns: 1fr; }
  .auth-intro { min-height: 35vh; padding: 3rem 2rem; }
  .auth-intro .brand-mark { margin-bottom: 4rem; }
  .auth-intro h1 { font-size: 2.6rem; }
  .auth-card { width: calc(100% - 2rem); margin: -1rem auto 2rem; padding: 2rem; }
  .workspace { grid-template-columns: 1fr; }
  .sidebar { position: fixed; z-index: 20; inset: 0 auto 0 0; width: min(18rem, 88vw); transform: translateX(-105%); box-shadow: var(--shadow); transition: transform .2s ease; }
  .sidebar.open { transform: translateX(0); }
  .icon-button { display: block; }
  .chat-archive { opacity: 1; }
  .messages { padding: 2rem 1.25rem; }
  .composer { width: calc(100% - 1.5rem); margin-bottom: .75rem; }
  .metric-row { grid-template-columns: 1fr; }
  .admin-hero { padding-top: 3rem; }
}
@media (max-width: 520px) {
  .prompt-grid { grid-template-columns: 1fr; }
  .message { grid-template-columns: 2.2rem minmax(0,1fr); gap: .6rem; }
  .admin-header { padding: 0 1rem; }
  .admin-header .brand strong { display: none; }
  .audit-list article { grid-template-columns: 1rem 1fr; }
  .audit-list time { grid-column: 2; }
  .preview-shell { padding-top: 1.5rem; }
  .preview-header { align-items: flex-start; flex-direction: column; }
}