:root{
  --bg: #f6f7fb;
  --card: rgba(255,255,255,.72);
  --card2: rgba(255,255,255,.62);
  --stroke: rgba(10,20,40,.10);
  --text: #101828;
  --muted: rgba(16,24,40,.55);
  --muted2: rgba(16,24,40,.40);
  --primary: #4f46e5;
  --primary2: #6d63ff;
  --shadow: 0 18px 50px rgba(16,24,40,.08);
  --shadow2: 0 10px 25px rgba(16,24,40,.08);
  --radius: 16px;
  --radius2: 20px;
}

*{ box-sizing: border-box; }
html,body{ height:100%; }
body{
  margin:0;
  font-family: ui-sans-serif, system-ui, -apple-system, Segoe UI, Roboto, Helvetica, Arial, "Apple Color Emoji","Segoe UI Emoji";
  color: var(--text);
  background:
    radial-gradient(800px 420px at 55% 45%, rgba(99,102,241,.16), transparent 60%),
    radial-gradient(700px 360px at 80% 80%, rgba(45,212,191,.12), transparent 60%),
    radial-gradient(700px 380px at 20% 70%, rgba(59,130,246,.10), transparent 60%),
    var(--bg);
}

button, textarea{
  font: inherit;
  color: inherit;
}

.app{
  height:100vh;
  display:flex;
  overflow:hidden;
}

/* Sidebar */
.sidebar{
  width: 290px;
  min-width: 290px;
  background: rgba(255,255,255,.55);
  border-right: 1px solid var(--stroke);
  backdrop-filter: blur(18px);
  -webkit-backdrop-filter: blur(18px);
  display:flex;
  flex-direction:column;
  padding: 18px 16px;
  position: relative;
}

.side-top{ display:flex; flex-direction:column; gap:14px; }
.brand{
  display:flex;
  align-items:center;
  justify-content:space-between;
  gap: 10px;
}
.brand-mark{
  width: 36px; height: 36px;
  border-radius: 12px;
  display:grid; place-items:center;
  background: rgba(79,70,229,.10);
  color: var(--primary);
}
.brand-text{ flex:1; }
.brand-name{ font-weight: 750; letter-spacing: .2px; }

.side-icons{ display:flex; gap:10px; }
.icon-btn{
  width: 36px; height: 36px;
  border-radius: 12px;
  border: 1px solid var(--stroke);
  background: rgba(255,255,255,.55);
  display:grid; place-items:center;
  box-shadow: 0 8px 20px rgba(16,24,40,.05);
  cursor:pointer;
}
.icon-btn svg{ width: 18px; height: 18px; }

.new-chat{
  width: 100%;
  border-radius: 12px;
  border: 1px solid var(--stroke);
  background: rgba(255,255,255,.65);
  padding: 10px 12px;
  display:flex; align-items:center; justify-content:center;
  gap: 10px;
  cursor:pointer;
}
.new-chat .plus{
  width: 18px; height: 18px;
  border-radius: 6px;
  display:grid; place-items:center;
  background: rgba(16,24,40,.06);
}

.side-mid{
  flex:1;
  display:flex;
  align-items:center;
  justify-content:center;
  padding: 18px 4px;
}

.login-card{
  width: 100%;
  max-width: 240px;
  padding: 18px;
  border-radius: 18px;
  border: 1px solid var(--stroke);
  background: linear-gradient(180deg, rgba(255,255,255,.75), rgba(255,255,255,.55));
  box-shadow: var(--shadow2);
  text-align:center;
}
.ghost-icon{
  width: 72px; height: 72px;
  margin: 4px auto 10px;
  border-radius: 20px;
  display:grid; place-items:center;
  color: var(--primary);
  background: radial-gradient(circle at 30% 30%, rgba(109,99,255,.18), rgba(79,70,229,.06));
  border: 1px solid rgba(79,70,229,.14);
}
.ghost-icon svg{ width: 48px; height: 48px; }
.login-text{
  margin: 8px 0 14px;
  font-size: 13px;
  line-height: 1.45;
  color: var(--muted);
}

.primary{
  width: 100%;
  border: none;
  border-radius: 12px;
  padding: 10px 12px;
  cursor:pointer;
  color: #fff;
  background: linear-gradient(135deg, var(--primary), var(--primary2));
  box-shadow: 0 12px 24px rgba(79,70,229,.25);
}

.side-bottom{
  display:flex;
  align-items:center;
  justify-content:space-between;
  gap:10px;
  padding-top: 6px;
}

.space-btn{
  flex:1;
  display:flex; align-items:center; gap:10px;
  padding: 10px 12px;
  border-radius: 12px;
  border: 1px solid var(--stroke);
  background: rgba(255,255,255,.55);
  cursor:pointer;
}
.folder svg{ width: 18px; height: 18px; }
.collapse-btn{
  width: 40px; height: 40px;
  border-radius: 12px;
  border: 1px solid var(--stroke);
  background: rgba(255,255,255,.55);
  display:grid; place-items:center;
  cursor:pointer;
}
.collapse-btn svg{ width: 18px; height: 18px; }

/* Main */
.main{
  flex:1;
  display:flex;
  flex-direction:column;
  min-width:0;
}

.topbar{
  height: 64px;
  display:flex;
  align-items:center;
  justify-content:space-between;
  padding: 0 22px;
}

.top-left{
  display:flex;
  align-items:center;
  gap: 12px;
}

.hamburger{
  display:none;
  width: 40px; height: 40px;
  border-radius: 12px;
  border: 1px solid var(--stroke);
  background: rgba(255,255,255,.55);
  cursor:pointer;
}
.hamburger svg{ width: 18px; height: 18px; }

.model{ position:relative; }
.model-btn{
  display:flex;
  align-items:center;
  gap: 8px;
  padding: 10px 12px;
  border-radius: 12px;
  border: 1px solid var(--stroke);
  background: rgba(255,255,255,.55);
  cursor:pointer;
}
.model-name{ font-weight: 650; }
.caret{ opacity:.65; }

.model-menu{
  position:absolute;
  top: 46px;
  left: 0;
  width: 180px;
  border-radius: 14px;
  border: 1px solid var(--stroke);
  background: rgba(255,255,255,.80);
  backdrop-filter: blur(16px);
  -webkit-backdrop-filter: blur(16px);
  box-shadow: var(--shadow2);
  padding: 6px;
  display:none;
  z-index: 20;
}
.model-menu.open{ display:block; }
.model-item{
  width:100%;
  text-align:left;
  padding: 10px 10px;
  border-radius: 12px;
  border: none;
  background: transparent;
  cursor:pointer;
}
.model-item:hover{ background: rgba(16,24,40,.06); }

.top-right{
  display:flex;
  align-items:center;
  gap: 10px;
  color: var(--muted);
}

.top-link{
  display:flex;
  align-items:center;
  gap: 8px;
  border:none;
  background: transparent;
  cursor:pointer;
  padding: 8px 10px;
  border-radius: 12px;
}
.top-link:hover{ background: rgba(255,255,255,.40); }
.mini-ico svg{ width: 18px; height: 18px; }

.login-btn{
  border: 1px solid var(--stroke);
  background: rgba(255,255,255,.55);
  padding: 9px 12px;
  border-radius: 999px;
  cursor:pointer;
  color: rgba(16,24,40,.75);
}

/* Center */
.center{
  flex:1;
  display:flex;
  flex-direction:column;
  align-items:center;
  justify-content:center;
  padding: 20px 18px 30px;
  gap: 18px;
}

.hello{
  margin: 0;
  font-size: clamp(24px, 2.4vw, 34px);
  letter-spacing: .2px;
  font-weight: 760;
  color: rgba(16,24,40,.92);
}

.composer{
  width: min(920px, 92vw);
}

.composer-inner{
  border-radius: var(--radius2);
  border: 1px solid var(--stroke);
  background: linear-gradient(180deg, var(--card), var(--card2));
  box-shadow: var(--shadow);
  padding: 16px;
}

.input-wrap{
  padding: 6px 8px 10px;
}

textarea{
  width: 100%;
  resize:none;
  border:none;
  outline:none;
  background: transparent;
  font-size: 15px;
  line-height: 1.45;
  padding: 8px 10px;
  color: rgba(16,24,40,.88);
}

.tools{
  display:flex;
  align-items:center;
  gap: 10px;
  flex-wrap: wrap;
  padding-top: 8px;
  border-top: 1px solid rgba(16,24,40,.06);
}

.chip{
  border: 1px solid rgba(16,24,40,.10);
  background: rgba(255,255,255,.55);
  padding: 8px 10px;
  border-radius: 999px;
  cursor:pointer;
  font-size: 13px;
  color: rgba(16,24,40,.72);
  display:flex;
  align-items:center;
  gap: 8px;
}
.chip-ico{
  width: 18px;
  display:inline-flex;
  align-items:center;
  justify-content:center;
  opacity: .85;
}
.chip:hover{ background: rgba(255,255,255,.75); }
.chip.active{
  border-color: rgba(79,70,229,.25);
  background: rgba(79,70,229,.08);
  color: rgba(20,24,40,.90);
}
.chip.ghost{
  width: 40px;
  justify-content:center;
}

.tools-right{
  margin-left: auto;
  display:flex;
  align-items:center;
  gap: 10px;
}

.send{
  width: 40px; height: 40px;
  border-radius: 999px;
  border: none;
  cursor:pointer;
  color: #fff;
  background: radial-gradient(circle at 30% 30%, rgba(255,255,255,.35), rgba(255,255,255,0) 50%),
              linear-gradient(135deg, var(--primary), var(--primary2));
  box-shadow: 0 14px 26px rgba(79,70,229,.25);
}
.send svg{ width: 18px; height: 18px; }

.quick{
  display:flex;
  align-items:center;
  gap: 28px;
  margin-top: 8px;
  color: var(--muted2);
  flex-wrap: wrap;
  justify-content:center;
}
.quick-item{
  border:none;
  background: transparent;
  cursor:pointer;
  display:flex;
  flex-direction:column;
  align-items:center;
  gap: 8px;
  min-width: 80px;
}
.qico{
  width: 36px; height: 36px;
  border-radius: 14px;
  display:grid; place-items:center;
  background: rgba(255,255,255,.55);
  border: 1px solid var(--stroke);
  box-shadow: 0 10px 22px rgba(16,24,40,.06);
}

.legal{
  margin-top: 10px;
  font-size: 12px;
  color: rgba(16,24,40,.35);
}

/* Overlay for mobile sidebar */
.overlay{
  position: fixed;
  inset: 0;
  background: rgba(16,24,40,.35);
  backdrop-filter: blur(2px);
  -webkit-backdrop-filter: blur(2px);
  z-index: 50;
}

/* Collapsed sidebar (desktop) */
.sidebar.collapsed{
  width: 86px;
  min-width: 86px;
}
.sidebar.collapsed .brand-text,
.sidebar.collapsed .new-chat span:last-child,
.sidebar.collapsed .login-card,
.sidebar.collapsed .space-btn span:last-child{
  display:none;
}
.sidebar.collapsed .new-chat{
  padding: 10px;
}
.sidebar.collapsed .side-mid{
  justify-content:center;
}

/* Responsive */
@media (max-width: 980px){
  .top-link span:last-child{ display:none; }
}

@media (max-width: 860px){
  .sidebar{
    position: fixed;
    left: 0;
    top: 0;
    bottom: 0;
    z-index: 60;
    transform: translateX(-105%);
    transition: transform .25s ease;
    box-shadow: 40px 0 80px rgba(16,24,40,.18);
  }
  .sidebar.open{
    transform: translateX(0);
  }
  .hamburger{ display:grid; place-items:center; }
}
/* ===== Tongyi Qwen scrollable sections ===== */
.tqv{
  width: 100%;
  margin-top: 12px;
  scroll-margin-top: 90px; /* helps anchor scroll with fixed topbar */
}

.tqv-card{
  border-radius: var(--radius2);
  border: 1px solid var(--stroke);
  background: linear-gradient(180deg, var(--card), var(--card2));
  box-shadow: var(--shadow);
  padding: 22px;
  margin-bottom: 28px; /* padding under section */
}

.tqv-hero{ padding-bottom: 12px; }
.tqv-pill{
  display:inline-flex; align-items:center;
  padding: 6px 10px;
  border-radius: 999px;
  border: 1px solid rgba(79,70,229,.18);
  background: rgba(79,70,229,.08);
  color: rgba(16,24,40,.78);
  font-size: 12px;
  font-weight: 800;
  margin-bottom: 10px;
}
.tqv-title{
  margin:0 0 8px;
  font-size: clamp(18px, 2.2vw, 26px);
  letter-spacing:.2px;
  font-weight: 820;
  color: rgba(16,24,40,.92);
}
.tqv-sub{
  margin: 0 0 10px;
  color: var(--muted);
  line-height: 1.65;
  font-size: 14px;
}

/* nav chips */
.tqv-nav{
  display:flex;
  flex-wrap: wrap;
  gap: 10px;
  padding-top: 12px;
  border-top: 1px solid rgba(16,24,40,.06);
}
.tqv-navlink{
  text-decoration: none;
  border: 1px solid rgba(16,24,40,.10);
  background: rgba(255,255,255,.55);
  padding: 8px 10px;
  border-radius: 999px;
  font-size: 13px;
  font-weight: 750;
  color: rgba(16,24,40,.72);
}
.tqv-navlink:hover{ background: rgba(255,255,255,.75); }

/* each section */
.tqv-sec{
  margin-top: 14px;
  padding-top: 14px;
  border-top: 1px solid rgba(16,24,40,.06);
  scroll-margin-top: 90px;
}
.tqv-sec-head h3{
  margin: 0 0 6px;
  font-size: 16px;
  font-weight: 850;
  color: rgba(16,24,40,.90);
}
.tqv-sec-head p{
  margin: 0 0 12px;
  color: rgba(16,24,40,.62);
  font-size: 14px;
  line-height: 1.65;
}

/* checklist */
.tqv-grid{
  display:grid;
  grid-template-columns: 1fr;
  gap: 12px;
}
.tqv-checklist{
  margin: 0;
  padding: 0;
  list-style: none;
  display:grid;
  grid-template-columns: 1fr 1fr;
  gap: 10px;
}
.tqv-checklist li{
  display:flex;
  align-items:flex-start;
  gap:10px;
  padding: 10px 12px;
  border-radius: 16px;
  border: 1px solid rgba(16,24,40,.08);
  background: rgba(255,255,255,.55);
  color: rgba(16,24,40,.72);
  font-size: 13px;
  line-height: 1.35;
}
.tqv-checklist li::before{
  content:"✓";
  display:inline-grid;
  place-items:center;
  width: 18px; height: 18px;
  margin-top: 1px;
  border-radius: 999px;
  border: 1px solid rgba(79,70,229,.20);
  background: rgba(79,70,229,.08);
  color: rgba(79,70,229,.95);
  font-weight: 900;
  flex: 0 0 auto;
}

/* note */
.tqv-note{
  display:flex;
  gap: 10px;
  align-items:flex-start;
  padding: 12px;
  border-radius: 16px;
  border: 1px solid rgba(79,70,229,.16);
  background: rgba(79,70,229,.08);
}
.tqv-note-badge{
  padding: 6px 10px;
  border-radius: 999px;
  border: 1px solid rgba(79,70,229,.22);
  background: rgba(255,255,255,.55);
  font-size: 12px;
  font-weight: 900;
  color: rgba(16,24,40,.78);
  white-space: nowrap;
}
.tqv-note p{
  margin:0;
  color: rgba(16,24,40,.62);
  font-size: 13px;
  line-height: 1.55;
}
.tqv-note2{ margin-top: 12px; }
.tqv-note3{ margin-top: 12px; }

/* cards list */
.tqv-cards{
  display:grid;
  grid-template-columns: 1fr 1fr;
  gap: 12px;
}
.tqv-item{
  display:flex;
  gap: 10px;
  padding: 12px;
  border-radius: 16px;
  border: 1px solid rgba(16,24,40,.08);
  background: rgba(255,255,255,.55);
}
.tqv-ico{
  width: 34px; height: 34px;
  border-radius: 14px;
  display:grid; place-items:center;
  border: 1px solid rgba(16,24,40,.10);
  background: rgba(255,255,255,.55);
  color: rgba(16,24,40,.75);
  flex: 0 0 auto;
  font-weight: 900;
}
.tqv-item-title{
  font-weight: 850;
  font-size: 13px;
  margin-bottom: 2px;
  color: rgba(16,24,40,.88);
}
.tqv-item-text{
  font-size: 12.5px;
  color: rgba(16,24,40,.55);
  line-height: 1.5;
}
.tqv-quote{
  display:block;
  margin-top: 6px;
  padding-left: 10px;
  border-left: 2px solid rgba(79,70,229,.25);
  color: rgba(16,24,40,.62);
}

/* why blocks */
.tqv-why{
  display:grid;
  grid-template-columns: 1fr 1fr;
  gap: 12px;
}
.tqv-box{
  padding: 12px;
  border-radius: 16px;
  border: 1px solid rgba(16,24,40,.08);
  background: rgba(255,255,255,.55);
}
.tqv-box-title{
  font-weight: 900;
  margin-bottom: 6px;
  color: rgba(16,24,40,.88);
}
.tqv-bullets{
  margin: 0;
  padding-left: 18px;
  color: rgba(16,24,40,.62);
  line-height: 1.6;
  font-size: 13px;
}
.tqv-pillgrid{
  display:flex;
  flex-wrap:wrap;
  gap: 8px;
  margin-top: 6px;
}
.tqv-pill2{
  font-size: 12px;
  padding: 7px 10px;
  border-radius: 999px;
  border: 1px solid rgba(16,24,40,.10);
  background: rgba(255,255,255,.55);
  color: rgba(16,24,40,.65);
}

/* use cases grid */
.tqv-usegrid{
  display:grid;
  grid-template-columns: 1fr 1fr;
  gap: 12px;
}
.tqv-use{
  padding: 12px;
  border-radius: 16px;
  border: 1px solid rgba(16,24,40,.08);
  background: rgba(255,255,255,.55);
}
.tqv-use-title{
  font-weight: 900;
  margin-bottom: 6px;
  color: rgba(16,24,40,.88);
}

/* modes */
.tqv-modegrid{
  display:grid;
  grid-template-columns: 1fr 1fr;
  gap: 10px;
}
.tqv-mode{
  display:flex;
  gap: 10px;
  align-items:center;
  padding: 10px 12px;
  border-radius: 16px;
  border: 1px solid rgba(16,24,40,.08);
  background: rgba(255,255,255,.55);
  color: rgba(16,24,40,.70);
  font-size: 13px;
}
.tqv-mode-ico{
  width: 28px; height: 28px;
  border-radius: 12px;
  display:grid; place-items:center;
  border: 1px solid rgba(16,24,40,.10);
  background: rgba(255,255,255,.55);
}

/* strengths vs limitations */
.tqv-compare{
  display:grid;
  grid-template-columns: 1fr 1fr;
  gap: 12px;
}
.tqv-col{
  padding: 12px;
  border-radius: 16px;
  border: 1px solid rgba(16,24,40,.08);
  background: rgba(255,255,255,.55);
}
.tqv-col-title{
  font-weight: 900;
  margin-bottom: 6px;
  color: rgba(16,24,40,.88);
}
.tqv-compare2{ margin-top: 10px; }

/* prompt tips */
.tqv-promptgrid{
  display:grid;
  grid-template-columns: 1fr 1fr;
  gap: 12px;
}
.tqv-prompt{
  padding: 12px;
  border-radius: 16px;
  border: 1px solid rgba(16,24,40,.08);
  background: rgba(255,255,255,.55);
}
.tqv-prompt-title{
  font-weight: 900;
  margin-bottom: 6px;
  color: rgba(16,24,40,.88);
}
.tqv-code pre{
  margin: 0;
  padding: 12px;
  border-radius: 14px;
  border: 1px solid rgba(16,24,40,.10);
  background: rgba(255,255,255,.55);
  overflow:auto;
}
.tqv-code code{
  font-family: ui-monospace, SFMono-Regular, Menlo, Monaco, Consolas, "Liberation Mono", "Courier New", monospace;
  font-size: 12.5px;
  color: rgba(16,24,40,.78);
}

/* faq */
.tqv-faq{ display:grid; gap: 10px; }
.tqv-faq-item{
  border-radius: 16px;
  border: 1px solid rgba(16,24,40,.08);
  background: rgba(255,255,255,.55);
  padding: 10px 12px;
}
.tqv-faq-item summary{
  cursor:pointer;
  font-weight: 850;
  color: rgba(16,24,40,.80);
  list-style: none;
}
.tqv-faq-item summary::-webkit-details-marker{ display:none; }
.tqv-faq-item p{
  margin: 8px 0 0;
  color: rgba(16,24,40,.62);
  font-size: 13px;
  line-height: 1.55;
}

/* Responsive */
@media (max-width: 860px){
  .tqv-card{ padding: 16px; }
  .tqv-checklist{ grid-template-columns: 1fr; }
  .tqv-cards{ grid-template-columns: 1fr; }
  .tqv-why{ grid-template-columns: 1fr; }
  .tqv-usegrid{ grid-template-columns: 1fr; }
  .tqv-modegrid{ grid-template-columns: 1fr; }
  .tqv-compare{ grid-template-columns: 1fr; }
  .tqv-promptgrid{ grid-template-columns: 1fr; }
  .tqv-note{ flex-direction: column; }
  .tqv-note-badge{ width: fit-content; }
}
.center{
  overflow-y: auto;
}
/* ===== Extra padding for the long Tongyi Qwen sections ===== */

/* Outer card padding (overall section container) */
.tqv-card{
  padding: 28px;          /* inside padding */
  margin-bottom: 36px;    /* space under whole block */
}

/* More space between each sub-section */
.tqv-sec{
  margin-top: 22px;       /* space above section */
  padding-top: 22px;      /* space inside section */
}

/* Increase padding inside content blocks */
.tqv-item,
.tqv-box,
.tqv-use,
.tqv-mode,
.tqv-col,
.tqv-prompt,
.tqv-faq-item{
  padding: 16px;          /* larger inner padding */
}

/* Bigger padding for note callouts */
.tqv-note{
  padding: 16px;
}

/* Give the hero/header some breathing room */
.tqv-hero{
  padding-bottom: 18px;
}

/* Responsive: slightly smaller on mobile */
@media (max-width: 860px){
  .tqv-card{ padding: 18px; }
  .tqv-sec{ margin-top: 16px; padding-top: 16px; }
  .tqv-item,
  .tqv-box,
  .tqv-use,
  .tqv-mode,
  .tqv-col,
  .tqv-prompt,
  .tqv-faq-item{ padding: 14px; }
  .tqv-note{ padding: 14px; }
}
.tqv-sec{ padding-bottom: 10px; }