/* ============================================================
   煊叶书画院 AI 艺术工作台 — 全局样式
   品牌：象牙白基底 / 墨石黑文字 / 藏金点缀 / 敦煌赭红强调
   ============================================================ */

:root{
  --bg: #FAFAFA;
  --bg-elev: #FFFFFF;
  --bg-sub: #F4F2EC;
  --text: #1A1A1A;
  --text-2: #666666;
  --text-3: #999;
  --gold: #D4B16A;
  --gold-deep: #B8934F;
  --red: #A0342C;
  --line: #E8E8E8;
  --line-warm: #E5E0D5;
  --shadow: 0 4px 24px rgba(26,26,26,.08);
  --shadow-sm: 0 2px 8px rgba(26,26,26,.06);
  --radius: 14px;
  --radius-sm: 8px;
  --sidebar-w: 240px;
  --sidebar-w-collapsed: 72px;
  --topbar-h: 60px;
  --serif: 'Noto Serif SC','Songti SC',serif;
  --sans: 'Noto Sans SC','PingFang SC',system-ui,sans-serif;
  --playfair: 'Playfair Display',serif;
  --ease: cubic-bezier(.22,1,.36,1);
}

/* 深色：暗色藏金主题 */
body.dark{
  --bg: #141310;
  --bg-elev: #1F1D18;
  --bg-sub: #26231D;
  --text: #EDE6D6;
  --text-2: #B8B0A0;
  --text-3: #8A8272;
  --gold: #D4B16A;
  --gold-deep: #E3C486;
  --red: #C65A4F;
  --line: #33302A;
  --line-warm: #3A352C;
  --shadow: 0 4px 24px rgba(0,0,0,.4);
  --shadow-sm: 0 2px 8px rgba(0,0,0,.3);
}

*{box-sizing:border-box;margin:0;padding:0}
html,body{height:100%}
body{
  font-family:var(--sans);
  background:var(--bg);
  color:var(--text);
  font-size:14px;
  line-height:1.7;
  -webkit-font-smoothing:antialiased;
  transition:background .3s,color .3s;
}
h1,h2,h3,h4{font-family:var(--serif);font-weight:600;line-height:1.3}
button{font-family:inherit;cursor:pointer;border:none;background:none;color:inherit}
input,textarea,select{font-family:inherit;font-size:inherit;color:inherit}
img{max-width:100%;display:block}
a{color:var(--gold-deep);text-decoration:none}
::-webkit-scrollbar{width:8px;height:8px}
::-webkit-scrollbar-thumb{background:rgba(160,160,160,.3);border-radius:4px}
::-webkit-scrollbar-track{background:transparent}

.app{display:flex;min-height:100vh}

/* ============ 侧边栏 ============ */
.sidebar{
  width:var(--sidebar-w);
  background:var(--bg-elev);
  border-right:1px solid var(--line);
  position:fixed;top:0;left:0;bottom:0;
  display:flex;flex-direction:column;
  z-index:100;
  transition:width .3s var(--ease),transform .3s var(--ease);
}
.sidebar__brand{
  height:var(--topbar-h);
  display:flex;align-items:center;gap:10px;
  padding:0 14px;
  border-bottom:1px solid var(--line);
  flex-shrink:0;
}
.sidebar__logo{width:36px;height:36px;border-radius:8px;object-fit:cover}
.sidebar__brand-text{flex:1;min-width:0;overflow:hidden}
.sidebar__brand-name{font-family:var(--serif);font-size:16px;font-weight:700;white-space:nowrap}
.sidebar__brand-sub{font-size:11px;color:var(--text-3);letter-spacing:1px}
.sidebar__collapse{flex-shrink:0}
.icon-btn{
  width:34px;height:34px;border-radius:8px;display:inline-flex;align-items:center;justify-content:center;
  color:var(--text-2);transition:.2s;
}
.icon-btn:hover{background:var(--bg-sub);color:var(--text)}

.sidebar__nav{flex:1;overflow-y:auto;padding:10px 10px}
.sidebar__nav-item{
  display:flex;align-items:center;gap:12px;
  width:100%;padding:10px 12px;border-radius:10px;
  color:var(--text-2);font-size:14px;margin-bottom:2px;
  transition:.2s;position:relative;text-align:left;
}
.sidebar__nav-item .nav-icon{flex-shrink:0;display:inline-flex;align-items:center;justify-content:center;width:22px;height:22px}
.sidebar__nav-item:hover{background:var(--bg-sub);color:var(--text)}
.sidebar__nav-item.active{background:linear-gradient(90deg,rgba(212,177,106,.16),rgba(212,177,106,.05));color:var(--gold-deep);font-weight:500}
.sidebar__nav-item.active::before{
  content:'';position:absolute;left:0;top:8px;bottom:8px;width:3px;
  background:var(--gold);border-radius:0 3px 3px 0;
}
.sidebar__footer{padding:10px;border-top:1px solid var(--line)}

/* 折叠态 */
.app.sidebar-collapsed .sidebar{width:var(--sidebar-w-collapsed)}
.app.sidebar-collapsed .sidebar__brand-text,
.app.sidebar-collapsed .nav-label,
.app.sidebar-collapsed .sidebar__collapse svg{display:none}
.app.sidebar-collapsed .sidebar__brand{justify-content:center;padding:0}
.app.sidebar-collapsed .sidebar__nav-item{justify-content:center;padding:10px}
.app.sidebar-collapsed .main{margin-left:var(--sidebar-w-collapsed)}
.sidebar-mask{display:none}

/* ============ 主区域 ============ */
.main{flex:1;margin-left:var(--sidebar-w);display:flex;flex-direction:column;min-width:0;min-height:100vh;transition:margin .3s var(--ease)}

.topbar{
  height:var(--topbar-h);
  background:var(--bg-elev);
  border-bottom:1px solid var(--line);
  display:flex;align-items:center;gap:14px;
  padding:0 20px;
  position:sticky;top:0;z-index:50;
}
.topbar__title{font-size:18px;font-weight:600;white-space:nowrap}
.topbar__search{
  flex:1;max-width:420px;margin:0 auto;
  display:flex;align-items:center;gap:8px;
  background:var(--bg-sub);border-radius:20px;padding:7px 14px;color:var(--text-3);
}
.topbar__search input{flex:1;border:none;background:none;outline:none;color:var(--text)}
.topbar__right{display:flex;align-items:center;gap:10px;margin-left:auto}
.topbar__avatar{width:36px;height:36px;border-radius:50%;overflow:hidden;border:2px solid var(--gold);cursor:pointer}
.topbar__avatar img{width:100%;height:100%;object-fit:cover}
.topbar__menu{display:none}

.content{flex:1;padding:24px;max-width:1200px;width:100%;margin:0 auto;animation:fadeIn .35s var(--ease)}

@keyframes fadeIn{from{opacity:0;transform:translateY(8px)}to{opacity:1;transform:none}}

/* ============ 通用组件 ============ */
.btn{
  display:inline-flex;align-items:center;justify-content:center;gap:6px;
  padding:10px 18px;border-radius:10px;font-size:14px;font-weight:500;
  background:var(--gold);color:#fff;transition:.25s;white-space:nowrap;
}
.btn:hover{filter:brightness(1.06);transform:translateY(-1px)}
.btn--ghost{background:transparent;color:var(--text-2);border:1px solid var(--line)}
.btn--ghost:hover{background:var(--bg-sub);color:var(--text)}
.btn--red{background:var(--red)}
.btn--dark{background:var(--text);color:var(--bg)}
.btn--sm{padding:6px 12px;font-size:13px;border-radius:8px}
.btn--block{width:100%}
.btn:disabled{opacity:.5;cursor:not-allowed;transform:none}

.card{
  background:var(--bg-elev);border:1px solid var(--line);
  border-radius:var(--radius);box-shadow:var(--shadow-sm);padding:20px;
}
.card--pad-lg{padding:28px}
.card-title{font-family:var(--serif);font-size:17px;margin-bottom:12px;display:flex;align-items:center;gap:8px}
.card-title::before{content:'';width:4px;height:16px;background:var(--gold);border-radius:2px}

.grid{display:grid;gap:16px}
.grid--2{grid-template-columns:repeat(2,1fr)}
.grid--3{grid-template-columns:repeat(3,1fr)}
.grid--4{grid-template-columns:repeat(4,1fr)}
.mt-16{margin-top:16px}.mt-24{margin-top:24px}.mb-16{margin-bottom:16px}

.badge{display:inline-block;padding:2px 10px;border-radius:20px;font-size:12px;background:var(--bg-sub);color:var(--text-2)}
.badge--gold{background:rgba(212,177,106,.15);color:var(--gold-deep)}
.badge--red{background:rgba(160,52,44,.12);color:var(--red)}

.section-head{margin-bottom:18px}
.section-head h2{font-size:22px}
.section-head p{color:var(--text-2);margin-top:4px}

/* Tabs */
.tabs{display:flex;gap:4px;border-bottom:1px solid var(--line);margin-bottom:20px;overflow-x:auto;-webkit-overflow-scrolling:touch}
.tab{
  padding:10px 16px;color:var(--text-2);font-size:14px;white-space:nowrap;
  border-bottom:2px solid transparent;margin-bottom:-1px;transition:.2s;
}
.tab:hover{color:var(--text)}
.tab.active{color:var(--gold-deep);border-bottom-color:var(--gold);font-weight:500}

/* 表单 */
.field{margin-bottom:14px}
.field label{display:block;font-size:13px;color:var(--text-2);margin-bottom:6px}
.input,.textarea,.select{
  width:100%;padding:10px 12px;border:1px solid var(--line);border-radius:10px;
  background:var(--bg);outline:none;transition:.2s;
}
.input:focus,.textarea:focus,.select:focus{border-color:var(--gold);box-shadow:0 0 0 3px rgba(212,177,106,.15)}
.textarea{resize:vertical;min-height:90px;line-height:1.6}
.form-row{display:flex;gap:12px}
.form-row>.field{flex:1}

/* 标签 chips */
.chips{display:flex;flex-wrap:wrap;gap:8px}
.chip{
  padding:6px 14px;border-radius:20px;border:1px solid var(--line);
  font-size:13px;color:var(--text-2);cursor:pointer;transition:.2s;background:var(--bg-elev);
}
.chip:hover{border-color:var(--gold);color:var(--gold-deep)}
.chip.active{background:var(--gold);color:#fff;border-color:var(--gold)}

/* ============ 对话模块 ============ */
.chat-layout{display:flex;flex-direction:column;height:calc(100vh - var(--topbar-h) - 48px);min-height:520px}
.chat-welcome{max-width:680px;margin:40px auto 0;text-align:center}
.chat-welcome__logo{width:64px;height:64px;border-radius:16px;margin:0 auto 16px;object-fit:cover;border:2px solid var(--gold)}
.chat-welcome h2{font-size:26px;margin-bottom:10px}
.chat-welcome p{color:var(--text-2)}
.quick-cards{display:grid;grid-template-columns:repeat(2,1fr);gap:12px;margin-top:24px}
.quick-card{
  text-align:left;padding:16px;border:1px solid var(--line);border-radius:12px;
  background:var(--bg-elev);transition:.25s;cursor:pointer;
}
.quick-card:hover{border-color:var(--gold);transform:translateY(-2px);box-shadow:var(--shadow)}
.quick-card .qc-icon{font-size:22px;margin-bottom:8px}
.quick-card h4{font-size:15px;margin-bottom:4px}
.quick-card p{font-size:12px;color:var(--text-3)}

.chat-msgs{flex:1;overflow-y:auto;padding:20px 0;scroll-behavior:smooth}
.chat-inner{max-width:820px;margin:0 auto;padding:0 20px}
.msg{display:flex;gap:10px;margin-bottom:18px;animation:fadeIn .3s var(--ease)}
.msg__avatar{width:34px;height:34px;border-radius:50%;overflow:hidden;flex-shrink:0}
.msg__avatar img{width:100%;height:100%;object-fit:cover}
.msg__body{max-width:78%}
.msg__name{font-size:12px;color:var(--text-3);margin-bottom:4px}
.msg__bubble{
  padding:12px 16px;border-radius:14px;font-size:14px;line-height:1.75;
  background:var(--bg-elev);border:1px solid var(--line);box-shadow:var(--shadow-sm);
}
.msg.user{flex-direction:row-reverse}
.msg.user .msg__body{display:flex;flex-direction:column;align-items:flex-end}
.msg.user .msg__bubble{background:var(--gold);color:#fff;border-color:var(--gold)}
.msg__bubble p{margin-bottom:8px}.msg__bubble p:last-child{margin-bottom:0}
.msg__bubble h1,.msg__bubble h2,.msg__bubble h3{margin:10px 0 6px}
.msg__bubble ul,.msg__bubble ol{margin:6px 0 6px 20px}
.msg__bubble li{margin-bottom:4px}
.msg__bubble strong{color:inherit}
.msg.user .msg__bubble strong{color:#fff}
.msg__bubble code{background:rgba(127,127,127,.15);padding:1px 6px;border-radius:4px;font-size:13px}
.msg__bubble pre{background:#2b2b2b;color:#e6e6e6;padding:12px;border-radius:8px;overflow-x:auto;margin:8px 0}
.msg__bubble pre code{background:none;color:inherit;padding:0}
.typing-dot{display:inline-block;width:7px;height:7px;border-radius:50%;background:var(--gold);margin-right:3px;animation:blink 1.2s infinite}
.typing-dot:nth-child(2){animation-delay:.2s}
.typing-dot:nth-child(3){animation-delay:.4s}
@keyframes blink{0%,80%,100%{opacity:.2}40%{opacity:1}}

.chat-input-bar{border-top:1px solid var(--line);padding:14px 0;background:var(--bg)}
.chat-input{
  max-width:820px;margin:0 auto;display:flex;gap:10px;align-items:flex-end;
  background:var(--bg-elev);border:1px solid var(--line);border-radius:14px;padding:10px;
}
.chat-input textarea{
  flex:1;border:none;background:none;outline:none;resize:none;max-height:140px;line-height:1.6;
}
.chat-input .icon-btn{flex-shrink:0}
.chat-history-list{max-width:820px;margin:0 auto;padding:10px 20px}
.chat-history-item{display:flex;justify-content:space-between;align-items:center;padding:8px 12px;border-radius:8px;cursor:pointer}
.chat-history-item:hover{background:var(--bg-sub)}
.chat-history-item.active{background:rgba(212,177,106,.12)}

/* ============ 生图工作室 ============ */
.studio-layout{display:grid;grid-template-columns:340px 1fr;gap:20px;align-items:start}
.aspect-grid{display:grid;grid-template-columns:repeat(3,1fr);gap:8px}
.aspect-opt{
  border:1px solid var(--line);border-radius:10px;padding:10px;text-align:center;cursor:pointer;transition:.2s;background:var(--bg-elev);
}
.aspect-opt:hover{border-color:var(--gold)}
.aspect-opt.active{border-color:var(--gold);background:rgba(212,177,106,.1);color:var(--gold-deep)}
.aspect-opt .ratio-box{margin:0 auto 6px;border:2px solid currentColor;border-radius:3px;opacity:.7}
.gallery{display:grid;grid-template-columns:repeat(auto-fill,minmax(200px,1fr));gap:12px}
.gallery-item{position:relative;border-radius:10px;overflow:hidden;background:var(--bg-sub);aspect-ratio:1;cursor:pointer}
.gallery-item img{width:100%;height:100%;object-fit:cover;transition:.3s}
.gallery-item:hover img{transform:scale(1.04)}
.gallery-item__bar{
  position:absolute;left:0;right:0;bottom:0;padding:14px 8px 6px;
  background:linear-gradient(transparent,rgba(0,0,0,.7));
  display:flex;gap:6px;opacity:0;transition:.2s;
}
.gallery-item:hover .gallery-item__bar{opacity:1}
.gallery-item__bar button{width:28px;height:28px;border-radius:6px;background:rgba(255,255,255,.9);color:#333;font-size:14px}
.word-count{font-size:12px;color:var(--text-3);text-align:right}

.loader{
  width:38px;height:38px;border:3px solid var(--line);border-top-color:var(--gold);
  border-radius:50%;animation:spin .8s linear infinite;margin:20px auto;
}
@keyframes spin{to{transform:rotate(360deg)}}

/* 提示词结果占位（未配置API时的艺术字预览） */
.demo-art{
  width:100%;height:100%;display:flex;align-items:center;justify-content:center;
  font-family:var(--serif);color:#fff;font-size:18px;text-align:center;padding:20px;
  background:linear-gradient(135deg,#2b2b3a,#6b4f8a 50%,#d4b16a);
}

/* ============ 视频 ============ */
.video-task{display:flex;align-items:center;gap:12px;padding:12px;border:1px solid var(--line);border-radius:10px;margin-bottom:10px}
.video-task .vt-thumb{width:100px;height:60px;border-radius:6px;background:var(--bg-sub);object-fit:cover;flex-shrink:0}
.video-task .vt-status{margin-left:auto}
.status-badge{padding:3px 10px;border-radius:12px;font-size:12px}
.status-badge.queue{background:#eee;color:#888}
.status-badge.running{background:rgba(212,177,106,.15);color:var(--gold-deep)}
.status-badge.done{background:rgba(80,160,90,.15);color:#3a8a4a}
.status-badge.error{background:rgba(160,52,44,.15);color:var(--red)}
video.player{width:100%;border-radius:12px;background:#000;margin-top:12px}

/* ============ 科目辅导 ============ */
.subject-block{margin-bottom:18px}
.subject-block h4{font-family:var(--serif);font-size:15px;margin-bottom:8px;color:var(--gold-deep)}
.subject-block ul{margin-left:18px}
.subject-block li{margin-bottom:5px;color:var(--text-2)}
.subject-block p{color:var(--text-2);margin-bottom:8px}

/* 时间轴 */
.timeline{position:relative;padding-left:24px}
.timeline::before{content:'';position:absolute;left:6px;top:6px;bottom:6px;width:2px;background:var(--line-warm)}
.timeline-item{position:relative;margin-bottom:18px}
.timeline-item::before{content:'';position:absolute;left:-22px;top:6px;width:12px;height:12px;border-radius:50%;background:var(--gold);border:2px solid var(--bg-elev)}
.timeline-item .tl-time{font-size:12px;color:var(--gold-deep);font-weight:600}
.timeline-item .tl-body{color:var(--text-2)}

/* 色卡 */
.color-swatches{display:flex;flex-wrap:wrap;gap:10px}
.swatch{width:80px;text-align:center}
.swatch .sw-chip{height:60px;border-radius:8px;box-shadow:var(--shadow-sm)}
.swatch .sw-name{font-size:12px;margin-top:6px;color:var(--text-2)}

/* 评分 */
.score-ring{text-align:center}
.score-ring .num{font-family:var(--serif);font-size:48px;font-weight:900;color:var(--gold-deep)}
.score-row{margin-bottom:12px}
.score-row .sr-head{display:flex;justify-content:space-between;font-size:13px;margin-bottom:4px}
.score-bar{height:8px;background:var(--bg-sub);border-radius:4px;overflow:hidden}
.score-bar .fill{height:100%;background:linear-gradient(90deg,var(--gold),var(--gold-deep));width:0;transition:width 1.2s var(--ease)}

/* 上传区 */
.upload-zone{
  border:2px dashed var(--line);border-radius:12px;padding:30px;text-align:center;
  color:var(--text-3);cursor:pointer;transition:.2s;
}
.upload-zone:hover,.upload-zone.drag{border-color:var(--gold);color:var(--gold-deep);background:rgba(212,177,106,.05)}
.upload-preview{margin-top:12px;text-align:center}
.upload-preview img{max-height:260px;border-radius:10px;margin:0 auto}

/* banner */
.dunhuang-banner{
  border-radius:var(--radius);padding:36px 28px;color:#fff;position:relative;overflow:hidden;
  background:
    radial-gradient(circle at 20% 30%,rgba(212,177,106,.35),transparent 40%),
    radial-gradient(circle at 80% 70%,rgba(160,52,44,.4),transparent 45%),
    linear-gradient(135deg,#3a2f4a,#6b4f3a 60%,#a0342c);
  margin-bottom:24px;
}
.dunhuang-banner h2{font-size:28px;text-shadow:0 2px 8px rgba(0,0,0,.3)}
.dunhuang-banner p{opacity:.9;margin-top:6px}

/* FAB */
.fab{
  position:fixed;right:24px;bottom:88px;width:54px;height:54px;border-radius:50%;
  background:var(--gold);color:#fff;box-shadow:0 6px 20px rgba(212,177,106,.5);
  display:flex;align-items:center;justify-content:center;z-index:90;transition:.25s;
}
.fab:hover{transform:scale(1.08)}

/* Toast */
.toast{
  position:fixed;top:80px;left:50%;transform:translateX(-50%) translateY(-20px);
  background:var(--text);color:var(--bg);padding:10px 20px;border-radius:10px;
  font-size:14px;opacity:0;pointer-events:none;transition:.3s;z-index:200;
}
.toast.show{opacity:1;transform:translateX(-50%) translateY(0)}

/* Lightbox */
.lightbox{
  position:fixed;inset:0;background:rgba(0,0,0,.88);z-index:300;display:none;
  align-items:center;justify-content:center;padding:30px;
}
.lightbox.open{display:flex}
.lightbox img{max-width:95%;max-height:92%;border-radius:8px}
.lightbox__close{position:absolute;top:20px;right:30px;color:#fff;font-size:40px;line-height:1}

/* 移动端底部Tab */
.mobile-tabbar{
  display:none;position:fixed;bottom:0;left:0;right:0;height:60px;
  background:var(--bg-elev);border-top:1px solid var(--line);z-index:100;
}
.mobile-tabbar button{
  flex:1;display:flex;flex-direction:column;align-items:center;justify-content:center;gap:2px;
  color:var(--text-3);font-size:11px;
}
.mobile-tabbar button.active{color:var(--gold-deep)}

.empty{text-align:center;color:var(--text-3);padding:40px 0}
.notice{
  background:rgba(212,177,106,.1);border:1px solid rgba(212,177,106,.3);
  border-radius:10px;padding:12px 16px;font-size:13px;color:var(--gold-deep);margin-bottom:16px;
}
.kv{display:grid;grid-template-columns:120px 1fr;gap:8px;font-size:14px}
.kv dt{color:var(--text-3)}
.kv dd{color:var(--text)}

/* ============ 响应式 ============ */
@media (max-width: 900px){
  .studio-layout{grid-template-columns:1fr}
  .grid--4{grid-template-columns:repeat(2,1fr)}
  .grid--3{grid-template-columns:repeat(2,1fr)}
}
@media (max-width: 768px){
  .sidebar{transform:translateX(-100%)}
  .app.sidebar-open .sidebar{transform:none}
  .sidebar-mask{display:none;position:fixed;inset:0;background:rgba(0,0,0,.4);z-index:95}
  .app.sidebar-open .sidebar-mask{display:block}
  .main{margin-left:0}
  .topbar__menu{display:inline-flex}
  .topbar__search{display:none}
  .content{padding:16px 16px 80px}
  .grid--2{grid-template-columns:1fr}
  .grid--3{grid-template-columns:1fr}
  .mobile-tabbar{display:flex}
  .fab{bottom:76px;right:16px}
  .quick-cards{grid-template-columns:1fr}
  .chat-layout{height:calc(100vh - var(--topbar-h) - 76px)}
}
@media (max-width: 480px){
  .grid--4{grid-template-columns:repeat(2,1fr)}
  .form-row{flex-direction:column}
  .topbar__title{font-size:16px}
  .msg__body{max-width:88%}
}