/* ============================================
   Token Relay — Premium Design System
   Refined Editorial + Tech Aesthetic
   ============================================ */

/* --- Google Fonts --- */
@import url('https://fonts.googleapis.com/css2?family=DM+Sans:opsz,wght@9..40,400;9..40,500;9..40,600;9..40,700&family=JetBrains+Mono:wght@400;500&display=swap');

/* --- CSS Variables --- */
:root {
  --ink: #0B1120;
  --ink-80: rgba(11,17,32,.8);
  --ink-60: rgba(11,17,32,.6);
  --ink-40: rgba(11,17,32,.4);
  --ink-15: rgba(11,17,32,.15);
  --ink-06: rgba(11,17,32,.06);
  --blue: #0057FF;
  --blue-hover: #0045CC;
  --blue-light: #EBF2FF;
  --blue-glow: rgba(0,87,255,.12);
  --green: #0D9488;
  --green-light: #E6FFFA;
  --amber: #D97706;
  --amber-light: #FFFBEB;
  --red: #DC2626;
  --red-light: #FEF2F2;
  --white: #FFFFFF;
  --warm: #F9F9FB;
  --border: #E8EAEF;
  --border-light: #F0F1F5;
  --nav-bg: #080C16;
  --nav-text: rgba(255,255,255,.7);
  --nav-text-hover: #fff;
  --shadow-sm: 0 1px 2px rgba(0,0,0,.04);
  --shadow: 0 1px 3px rgba(0,0,0,.06),0 1px 2px rgba(0,0,0,.04);
  --shadow-md: 0 4px 12px rgba(0,0,0,.06);
  --shadow-lg: 0 12px 40px rgba(0,0,0,.08);
  --shadow-xl: 0 20px 60px rgba(0,0,0,.1);
  --radius: 8px;
  --radius-sm: 6px;
  --radius-md: 12px;
  --radius-lg: 16px;
  --radius-xl: 24px;
  --radius-full: 9999px;
  --font: 'DM Sans',-apple-system,BlinkMacSystemFont,'Segoe UI',sans-serif;
  --mono: 'JetBrains Mono','Fira Code','Consolas',monospace;
  --nav-h: 60px;
}

/* --- Reset --- */
*,*::before,*::after{box-sizing:border-box;margin:0;padding:0}
html{font-family:var(--font);font-size:16px;line-height:1.6;color:var(--ink);background:var(--white);-webkit-font-smoothing:antialiased;-moz-osx-font-smoothing:grayscale}
body{min-height:100vh;display:flex;flex-direction:column}
a{color:var(--blue);text-decoration:none;transition:color .15s}
a:hover{color:var(--blue-hover)}
img{max-width:100%;display:block}

/* --- Typography --- */
h1,h2,h3,h4{font-weight:700;line-height:1.2;letter-spacing:-.02em;color:var(--ink)}
h1{font-size:clamp(2rem,5vw,3.5rem)}
h2{font-size:clamp(1.5rem,3vw,2.25rem)}
h3{font-size:1.125rem;letter-spacing:-.01em}
.text-xs{font-size:.75rem}
.text-sm{font-size:.875rem}
.text-base{font-size:1rem}
.text-lg{font-size:1.125rem}
.text-xl{font-size:1.25rem}
.text-2xl{font-size:1.5rem}
.text-3xl{font-size:1.875rem}
.font-mono{font-family:var(--mono);font-size:.9em}
.font-medium{font-weight:500}
.font-semibold{font-weight:600}
.font-bold{font-weight:700}
.text-center{text-align:center}
.text-right{text-align:right}
.text-muted{color:var(--ink-40)}
.text-secondary{color:var(--ink-60)}

/* --- Colors --- */
.text-blue{color:var(--blue)}
.text-green{color:var(--green)}
.text-amber{color:var(--amber)}
.text-red{color:var(--red)}
.text-white{color:#fff}

/* --- Layout --- */
.flex{display:flex}
.inline-flex{display:inline-flex}
.grid{display:grid}
.hidden{display:none}
.block{display:block}
.flex-col{flex-direction:column}
.flex-wrap{flex-wrap:wrap}
.items-start{align-items:flex-start}
.items-center{align-items:center}
.items-end{align-items:flex-end}
.justify-center{justify-content:center}
.justify-between{justify-content:space-between}
.justify-end{justify-content:flex-end}
.gap-1{gap:4px}
.gap-2{gap:8px}
.gap-3{gap:12px}
.gap-4{gap:16px}
.gap-5{gap:20px}
.gap-6{gap:24px}
.gap-8{gap:32px}
.gap-10{gap:40px}
.gap-12{gap:48px}
.flex-1{flex:1}
.flex-shrink-0{flex-shrink:0}
.grid-cols-1{grid-template-columns:repeat(1,1fr)}
.grid-cols-2{grid-template-columns:repeat(2,1fr)}
.grid-cols-3{grid-template-columns:repeat(3,1fr)}
.grid-cols-4{grid-template-columns:repeat(4,1fr)}

/* --- Spacing --- */
.p-0{padding:0}
.p-2{padding:8px}.p-3{padding:12px}.p-4{padding:16px}.p-5{padding:20px}.p-6{padding:24px}.p-8{padding:32px}.p-10{padding:40px}
.px-2{padding-left:8px;padding-right:8px}.px-3{padding-left:12px;padding-right:12px}.px-4{padding-left:16px;padding-right:16px}.px-5{padding-left:20px;padding-right:20px}.px-6{padding-left:24px;padding-right:24px}.px-8{padding-left:32px;padding-right:32px}
.py-1{padding-top:4px;padding-bottom:4px}.py-2{padding-top:8px;padding-bottom:8px}.py-3{padding-top:12px;padding-bottom:12px}.py-4{padding-top:16px;padding-bottom:16px}.py-6{padding-top:24px;padding-bottom:24px}.py-8{padding-top:32px;padding-bottom:32px}.py-12{padding-top:48px;padding-bottom:48px}.py-16{padding-top:64px;padding-bottom:64px}.py-20{padding-top:80px;padding-bottom:80px}.py-24{padding-top:96px;padding-bottom:96px}
.m-0{margin:0}.mt-1{margin-top:4px}.mt-2{margin-top:8px}.mt-4{margin-top:16px}.mt-6{margin-top:24px}.mt-8{margin-top:32px}.mt-12{margin-top:48px}.mb-2{margin-bottom:8px}.mb-4{margin-bottom:16px}.mb-6{margin-bottom:24px}.mb-8{margin-bottom:32px}.mb-12{margin-bottom:48px}
.ml-auto{margin-left:auto}.mr-2{margin-right:8px}.mx-auto{margin-left:auto;margin-right:auto}

/* --- Dimensions --- */
.w-full{width:100%}.h-full{height:100%}
.max-w-sm{max-width:400px}.max-w-md{max-width:520px}.max-w-lg{max-width:640px}.max-w-2xl{max-width:720px}.max-w-3xl{max-width:860px}.max-w-4xl{max-width:1024px}.max-w-5xl{max-width:1152px}.max-w-6xl{max-width:1280px}

/* --- Borders --- */
.border{border:1px solid var(--border)}.border-t{border-top:1px solid var(--border)}.border-b{border-bottom:1px solid var(--border)}.border-l{border-left:1px solid var(--border)}.border-r{border-right:1px solid var(--border)}.border-0{border:0}.border-blue{border-color:var(--blue)}

/* --- Radius --- */
.rounded{border-radius:var(--radius)}.rounded-sm{border-radius:var(--radius-sm)}.rounded-md{border-radius:var(--radius-md)}.rounded-lg{border-radius:var(--radius-lg)}.rounded-xl{border-radius:var(--radius-xl)}.rounded-full{border-radius:var(--radius-full)}

/* --- Shadows --- */
.shadow-sm{box-shadow:var(--shadow-sm)}.shadow{box-shadow:var(--shadow)}.shadow-md{box-shadow:var(--shadow-md)}.shadow-lg{box-shadow:var(--shadow-lg)}.shadow-xl{box-shadow:var(--shadow-xl)}

/* --- Overflow --- */
.overflow-x-auto{overflow-x:auto}.overflow-y-auto{overflow-y:auto}.overflow-hidden{overflow:hidden}

/* --- Position --- */
.relative{position:relative}.absolute{position:absolute}.fixed{position:fixed}.sticky{position:sticky}
.top-0{top:0}.left-0{left:0}.right-0{right:0}.bottom-0{bottom:0}
.z-10{z-index:10}.z-20{z-index:20}.z-40{z-index:40}.z-50{z-index:50}

/* --- Transitions --- */
.transition{transition:all .2s ease}

/* --- Cursor --- */
.cursor-pointer{cursor:pointer}

/* ============ NAVBAR ============ */
.navbar{
  height:var(--nav-h);background:var(--nav-bg);position:sticky;top:0;z-index:100;
  display:flex;align-items:center;padding:0 28px;gap:8px;
  backdrop-filter:blur(12px);-webkit-backdrop-filter:blur(12px);
  border-bottom:1px solid rgba(255,255,255,.08);
}
.nav-logo{
  font-size:1.15rem;font-weight:700;color:#fff;display:flex;align-items:center;gap:8px;
  letter-spacing:-.01em;margin-right:8px;
}
.nav-logo .dot{width:8px;height:8px;border-radius:50%;background:var(--blue);box-shadow:0 0 12px var(--blue)}
.nav-links{display:flex;align-items:center;gap:2px}
.nav-link{
  padding:8px 16px;font-size:.875rem;font-weight:500;color:var(--nav-text);
  border-radius:var(--radius);transition:all .15s;letter-spacing:-.005em;
}
.nav-link:hover{color:var(--nav-text-hover);background:rgba(255,255,255,.06)}
.nav-link.active{color:#fff;background:rgba(255,255,255,.1)}
.nav-right{margin-left:auto;display:flex;align-items:center;gap:12px}
.nav-user{font-size:.8125rem;color:var(--nav-text);max-width:200px;overflow:hidden;text-overflow:ellipsis;white-space:nowrap}

/* ============ BUTTONS ============ */
.btn{
  display:inline-flex;align-items:center;justify-content:center;gap:8px;
  padding:10px 22px;font-size:.875rem;font-weight:600;line-height:1.5;
  border-radius:var(--radius);border:1px solid transparent;cursor:pointer;
  transition:all .15s;white-space:nowrap;font-family:var(--font);
  letter-spacing:-.005em;text-decoration:none;
}
.btn:disabled{opacity:.45;pointer-events:none}
.btn-sm{padding:7px 16px;font-size:.8125rem}
.btn-lg{padding:14px 32px;font-size:1rem}
.btn-primary{background:var(--blue);color:#fff}
.btn-primary:hover{background:var(--blue-hover);transform:translateY(-1px);box-shadow:0 4px 16px var(--blue-glow)}
.btn-outline{background:transparent;border-color:var(--ink-15);color:var(--ink)}
.btn-outline:hover{background:var(--ink-06);border-color:var(--ink-40)}
.btn-ghost{background:transparent;border-color:transparent;color:var(--ink-60)}
.btn-ghost:hover{background:var(--ink-06);color:var(--ink)}
.btn-danger{background:var(--red);color:#fff}
.btn-danger:hover{background:#B91C1C}
.btn-success{background:var(--green);color:#fff}
.btn-white{background:#fff;color:var(--ink)}
.btn-white:hover{background:#F1F5F9}
.btn-nav{color:var(--nav-text);padding:8px 16px;font-size:.875rem;font-weight:500;border-radius:var(--radius);background:transparent;border:0;cursor:pointer;font-family:var(--font);letter-spacing:-.005em}
.btn-nav:hover{color:#fff;background:rgba(255,255,255,.06)}
.btn-nav-primary{background:var(--blue);color:#fff;padding:8px 20px;font-size:.875rem;font-weight:600;border-radius:var(--radius);border:0;cursor:pointer;font-family:var(--font);transition:all .15s}
.btn-nav-primary:hover{background:var(--blue-hover)}

/* ============ CARDS ============ */
.card{background:var(--white);border:1px solid var(--border);border-radius:var(--radius-lg);transition:all .25s}
.card-hover:hover{border-color:transparent;box-shadow:var(--shadow-lg);transform:translateY(-2px)}
.card-body{padding:28px}
.card-header{padding:24px 28px 0}
.stat-card{border-left:3px solid var(--blue);padding:20px 24px}

/* ============ FORMS ============ */
.form-label{display:block;font-size:.8125rem;font-weight:600;color:var(--ink-80);margin-bottom:6px;letter-spacing:-.005em}
.form-input{
  display:block;width:100%;padding:10px 14px;font-size:.875rem;font-family:var(--font);
  color:var(--ink);background:var(--white);border:1.5px solid var(--border);
  border-radius:var(--radius);outline:none;transition:all .15s;
}
.form-input:focus{border-color:var(--blue);box-shadow:0 0 0 3px var(--blue-glow)}
.form-input::placeholder{color:var(--ink-40)}
.form-input:disabled{background:var(--warm);color:var(--ink-40)}
.form-group{margin-bottom:18px}
.form-error{font-size:.8125rem;color:var(--red);margin-top:6px;display:none}
.form-error.show{display:block}
.form-select{
  display:block;width:100%;padding:10px 14px;font-size:.875rem;font-family:var(--font);
  color:var(--ink);background:var(--white);border:1.5px solid var(--border);
  border-radius:var(--radius);outline:none;cursor:pointer;appearance:none;
  background-image:url("data:image/svg+xml,%3csvg xmlns='http://www.w3.org/2000/svg' viewBox='0 0 16 16'%3e%3cpath fill='none' stroke='%2394A3B8' stroke-linecap='round' stroke-linejoin='round' stroke-width='2' d='m2 5 6 6 6-6'/%3e%3c/svg%3e");
  background-repeat:no-repeat;background-position:right 12px center;background-size:16px;
  padding-right:40px;
}

/* ============ TABLES ============ */
.table{width:100%;border-collapse:collapse;font-size:.875rem}
.table th{font-weight:600;text-align:left;padding:12px 16px;border-bottom:2px solid var(--border);color:var(--ink-60);font-size:.8125rem;text-transform:uppercase;letter-spacing:.04em}
.table td{padding:14px 16px;border-bottom:1px solid var(--border-light)}
.table tbody tr{transition:background .1s}
.table tbody tr:hover{background:var(--warm)}

/* ============ BADGES ============ */
.badge{
  display:inline-flex;align-items:center;gap:4px;padding:3px 10px;
  font-size:.75rem;font-weight:600;border-radius:var(--radius-full);
  white-space:nowrap;line-height:1.4;letter-spacing:-.005em;
}
.badge-blue{background:var(--blue-light);color:var(--blue)}
.badge-green{background:var(--green-light);color:var(--green)}
.badge-amber{background:var(--amber-light);color:var(--amber)}
.badge-red{background:var(--red-light);color:var(--red)}
.badge-muted{background:var(--warm);color:var(--ink-40)}
.badge-sm{padding:2px 8px;font-size:.6875rem}

/* ============ ALERTS ============ */
.alert{padding:14px 18px;border-radius:var(--radius);font-size:.875rem;display:none}
.alert.show{display:block}
.alert-success{background:var(--green-light);color:#0F766E;border:1px solid #99F6E4}
.alert-error{background:var(--red-light);color:#991B1B;border:1px solid #FECACA}

/* ============ MODALS ============ */
.modal-overlay{
  position:fixed;inset:0;background:rgba(8,12,22,.6);backdrop-filter:blur(4px);
  display:flex;align-items:center;justify-content:center;z-index:200;
  animation:fadeIn .2s;
}
.modal{
  background:var(--white);border-radius:var(--radius-lg);box-shadow:var(--shadow-xl);
  width:90%;max-width:480px;max-height:90vh;overflow-y:auto;animation:slideUp .25s;
}
.modal-header{padding:24px 28px 0;display:flex;align-items:center;justify-content:space-between}
.modal-header h3{font-size:1.1rem}
.modal-body{padding:24px 28px}
.modal-footer{padding:0 28px 24px;display:flex;gap:12px;justify-content:flex-end}
.modal-close{background:none;border:0;font-size:1.5rem;color:var(--ink-40);cursor:pointer;padding:0;line-height:1;width:32px;height:32px;display:flex;align-items:center;justify-content:center;border-radius:var(--radius)}
.modal-close:hover{color:var(--ink);background:var(--warm)}

@keyframes fadeIn{from{opacity:0}to{opacity:1}}
@keyframes slideUp{from{opacity:0;transform:translateY(16px)}to{opacity:1;transform:translateY(0)}}

/* ============ TOAST ============ */
#toast-container{position:fixed;top:76px;right:24px;z-index:300;display:flex;flex-direction:column;gap:8px}
.toast{
  padding:12px 20px;border-radius:var(--radius);font-size:.875rem;font-weight:500;
  box-shadow:var(--shadow-lg);animation:slideIn .3s;max-width:380px;
}
.toast-success{background:#0F172A;color:#fff}
.toast-error{background:#991B1B;color:#fff}
@keyframes slideIn{from{transform:translateX(100%);opacity:0}to{transform:translateX(0);opacity:1}}

/* ============ EMPTY STATE ============ */
.empty-state{text-align:center;padding:56px 24px;color:var(--ink-40)}
.empty-state .icon{font-size:2.5rem;margin-bottom:16px;opacity:.6}

/* ============ HERO ============ */
.hero{
  background:var(--nav-bg);padding:100px 28px 120px;text-align:center;
  position:relative;overflow:hidden;
}
.hero::before{
  content:'';position:absolute;inset:0;
  background:radial-gradient(ellipse 60% 60% at 50% 0%,rgba(0,87,255,.15) 0%,transparent 70%),
             radial-gradient(ellipse 40% 50% at 80% 80%,rgba(14,165,233,.08) 0%,transparent 70%);
  pointer-events:none;
}
.hero::after{
  content:'';position:absolute;top:0;left:0;right:0;bottom:0;
  background-image:
    linear-gradient(rgba(255,255,255,.03) 1px,transparent 1px),
    linear-gradient(90deg,rgba(255,255,255,.03) 1px,transparent 1px);
  background-size:60px 60px;pointer-events:none;mask-image:radial-gradient(ellipse 80% 60% at 50% 0%,black 20%,transparent 70%);
}
.hero-content{position:relative;z-index:1}
.hero h1{color:#fff;font-size:clamp(2.5rem,6vw,4rem);line-height:1.1;margin-bottom:20px;letter-spacing:-.03em}
.hero h1 .highlight{background:linear-gradient(135deg,#60A5FA,#818CF8);-webkit-background-clip:text;-webkit-text-fill-color:transparent;background-clip:text}
.hero p{font-size:1.15rem;color:rgba(255,255,255,.6);max-width:600px;margin:0 auto 36px;line-height:1.7}
.hero-btns{display:flex;gap:14px;justify-content:center;flex-wrap:wrap}
.hero-stats{display:flex;gap:56px;justify-content:center;margin-top:64px}
.hero-stat .num{font-size:2.25rem;font-weight:700;color:#fff;letter-spacing:-.02em}
.hero-stat .label{font-size:.8125rem;color:rgba(255,255,255,.45);margin-top:4px;text-transform:uppercase;letter-spacing:.06em}

/* ============ SECTION ============ */
.section{padding:88px 28px}
.section-header{text-align:center;max-width:640px;margin:0 auto 60px}
.section-header h2{font-size:2rem;margin-bottom:12px;letter-spacing:-.03em}
.section-header p{color:var(--ink-60);font-size:1.05rem;line-height:1.6}
.section-alt{background:var(--warm)}

/* ============ MODEL GRID ============ */
.model-grid{display:grid;grid-template-columns:repeat(auto-fill,minmax(300px,1fr));gap:20px}
.model-card{
  background:var(--white);border:1px solid var(--border);border-radius:var(--radius-lg);
  padding:24px;transition:all .25s;position:relative;overflow:hidden;
}
.model-card::before{
  content:'';position:absolute;top:0;left:0;right:0;height:3px;
  background:linear-gradient(90deg,var(--blue),#818CF8);opacity:0;transition:opacity .25s;
}
.model-card:hover{border-color:transparent;box-shadow:var(--shadow-lg);transform:translateY(-3px)}
.model-card:hover::before{opacity:1}
.model-card .provider{display:flex;align-items:center;gap:8px;margin-bottom:14px}
.model-card .provider-icon{
  width:32px;height:32px;border-radius:var(--radius-sm);display:flex;
  align-items:center;justify-content:center;font-weight:700;font-size:.75rem;
  background:var(--ink-06);color:var(--ink-60);
}
.model-card .model-name{font-size:1.05rem;font-weight:600;margin-bottom:4px;letter-spacing:-.01em}
.model-card .model-desc{font-size:.8125rem;color:var(--ink-60);margin-bottom:16px;line-height:1.5}
.model-card .pricing-row{display:flex;justify-content:space-between;padding:7px 0;border-top:1px solid var(--border-light);font-size:.8125rem}
.model-card .pricing-row .price{font-weight:600;color:var(--blue)}

/* ============ FEATURE CARDS ============ */
.feature-grid{display:grid;grid-template-columns:repeat(auto-fill,minmax(260px,1fr));gap:20px}
.feature-card{background:var(--white);border:1px solid var(--border);border-radius:var(--radius-lg);padding:28px;transition:all .25s}
.feature-card:hover{border-color:transparent;box-shadow:var(--shadow-md);transform:translateY(-2px)}
.feature-card .icon{font-size:1.75rem;margin-bottom:16px;display:block}
.feature-card h3{margin-bottom:8px}

/* ============ SIDEBAR LAYOUT ============ */
.layout{display:flex;min-height:calc(100vh - var(--nav-h))}
.sidebar{
  width:232px;background:var(--white);border-right:1px solid var(--border);
  padding:20px 0;flex-shrink:0;position:sticky;top:var(--nav-h);
  height:calc(100vh - var(--nav-h));overflow-y:auto;
}
.sidebar-section{padding:0 16px 8px}
.sidebar-label{padding:10px 20px;font-size:.6875rem;font-weight:700;text-transform:uppercase;letter-spacing:.08em;color:var(--ink-40)}
.sidebar-link{
  display:flex;align-items:center;gap:10px;padding:10px 20px;font-size:.875rem;
  font-weight:500;color:var(--ink-60);border-radius:0;
  transition:all .15s;border-left:2px solid transparent;margin:1px 0;
}
.sidebar-link:hover{color:var(--ink);background:var(--warm)}
.sidebar-link.active{color:var(--blue);background:var(--blue-light);border-left-color:var(--blue)}
.sidebar-link .icon{font-size:.95rem;width:20px;text-align:center;opacity:.7}
.main-content{flex:1;padding:32px 36px;max-width:calc(100vw - 232px);background:var(--warm)}

/* ============ PAGE HEADER ============ */
.page-header{margin-bottom:28px}
.page-header h1{font-size:1.75rem;letter-spacing:-.02em}
.page-header p{color:var(--ink-60);font-size:.875rem;margin-top:4px}

/* ============ RESPONSIVE ============ */
@media(max-width:900px){
  .sidebar{display:none}
  .main-content{max-width:100%}
  .layout{display:block}
  .hero{padding:64px 20px 80px}
  .hero h1{font-size:2.25rem}
  .hero-stats{gap:28px;flex-wrap:wrap}
  .model-grid{grid-template-columns:1fr}
  .grid-cols-4,.grid-cols-3{grid-template-columns:repeat(2,1fr)}
  .nav-links{display:none}
  .section{padding:56px 20px}
}
@media(max-width:640px){
  .hero h1{font-size:1.75rem}
  .section-header h2{font-size:1.5rem}
  .grid-cols-2,.grid-cols-3,.grid-cols-4{grid-template-columns:1fr}
}

/* ============ TABS ============ */
.tabs{display:flex;border-bottom:2px solid var(--border);gap:0;margin-bottom:24px;flex-wrap:wrap}
.tab{
  padding:10px 18px;font-size:.875rem;font-weight:500;color:var(--ink-40);
  cursor:pointer;border-bottom:2px solid transparent;margin-bottom:-2px;
  transition:all .15s;background:none;border-top:0;border-left:0;border-right:0;
  font-family:var(--font);letter-spacing:-.005em;
}
.tab:hover{color:var(--ink-60)}
.tab.active{color:var(--blue);border-bottom-color:var(--blue)}

/* ============ PRICING TABLE ============ */
.pricing-table .table td:first-child{font-family:var(--mono);font-size:.8125rem;font-weight:500}
.pricing-table .table td:first-child strong{font-family:var(--font);font-size:.875rem}

/* ============ CHAT 2.0 ============ */
.chat-layout{display:flex;height:calc(100vh - 60px);background:var(--white)}
/* Sidebar */
.chat-sidebar{width:260px;flex-shrink:0;border-right:1px solid var(--border);display:flex;flex-direction:column;background:var(--warm)}
.chat-sidebar-hd{padding:14px;border-bottom:1px solid var(--border)}
.chat-sidebar-list{flex:1;overflow-y:auto;padding:6px}
.chat-sidebar-ft{padding:12px 14px;border-top:1px solid var(--border)}
.conv-item{padding:10px 12px;border-radius:8px;cursor:pointer;transition:background .12s;margin-bottom:1px;display:flex;align-items:center;justify-content:space-between;gap:4px}
.conv-item:hover{background:var(--ink-06)}
.conv-item.active{background:rgba(0,87,255,.08)}
.conv-item .conv-info{flex:1;min-width:0}
.conv-item .conv-title{font-size:.8125rem;font-weight:500;overflow:hidden;text-overflow:ellipsis;white-space:nowrap;color:var(--ink);line-height:1.4}
.conv-item.active .conv-title{color:var(--blue)}
.conv-item .conv-meta{font-size:.6875rem;color:var(--ink-40);margin-top:1px}
.conv-item .conv-actions{display:none;gap:2px;flex-shrink:0}
.conv-item:hover .conv-actions{display:flex}
.conv-btn{width:28px;height:28px;border:0;background:none;cursor:pointer;border-radius:6px;display:flex;align-items:center;justify-content:center;color:var(--ink-40);transition:all .12s}
.conv-btn:hover{background:var(--ink-06);color:var(--ink)}
.conv-btn.danger:hover{background:rgba(220,38,38,.1);color:var(--red)}
/* Main */
.chat-main{flex:1;display:flex;flex-direction:column;min-width:0;background:var(--white)}
.chat-topbar{padding:8px 24px;border-bottom:1px solid var(--border);display:flex;align-items:center;gap:12px;background:var(--white);min-height:48px}
.chat-model-select{padding:6px 28px 6px 10px;font-size:.8125rem;font-family:var(--font);border:1px solid var(--border);border-radius:8px;background:var(--white);cursor:pointer;outline:none;color:var(--ink);appearance:none;-webkit-appearance:none;background-image:url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='12' height='12' viewBox='0 0 24 24' fill='none' stroke='%23666' stroke-width='2'%3E%3Cpath d='M6 9l6 6 6-6'%3E%3C/path%3E%3C/svg%3E");background-repeat:no-repeat;background-position:right 8px center}
.chat-model-select:focus{border-color:var(--blue);box-shadow:0 0 0 3px rgba(0,87,255,.1)}
/* Messages */
.chat-messages{flex:1;overflow-y:auto;padding:24px 24px 0;display:flex;flex-direction:column;gap:20px}
.chat-messages::-webkit-scrollbar{width:6px}
.chat-messages::-webkit-scrollbar-thumb{background:var(--ink-15);border-radius:3px}
/* Welcome */
.chat-welcome{display:flex;flex-direction:column;align-items:center;justify-content:center;flex:1;padding:40px 20px 60px;text-align:center}
.welcome-icon{font-size:3rem;margin-bottom:12px;opacity:.6}
.chat-welcome h2{font-size:1.375rem;font-weight:700;color:var(--ink);margin-bottom:6px;letter-spacing:-.01em}
.chat-welcome p{font-size:.875rem;color:var(--ink-40);margin-bottom:24px}
.welcome-hints{display:grid;grid-template-columns:repeat(4,1fr);gap:10px;max-width:560px;width:100%}
.hint-card{padding:14px 10px;border:1px solid var(--border);border-radius:12px;cursor:pointer;transition:all .15s;text-align:center}
.hint-card:hover{border-color:var(--blue);background:rgba(0,87,255,.04)}
.hint-icon{font-size:1.5rem;margin-bottom:4px}
.hint-card div:last-child{font-size:.8125rem;font-weight:500;color:var(--ink-60)}
.chat-empty-state{display:flex;align-items:center;justify-content:center;flex:1;color:var(--ink-30);font-size:.875rem}
/* Message rows */
.msg-row{display:flex;gap:12px;max-width:820px;width:100%}
.msg-row.user{align-self:flex-end;flex-direction:row-reverse}
.msg-row.assistant{align-self:flex-start}
.msg-avatar{width:32px;height:32px;border-radius:50%;display:flex;align-items:center;justify-content:center;font-size:.8125rem;flex-shrink:0}
.msg-avatar.user{background:var(--blue);color:#fff}
.msg-avatar.assistant{background:var(--ink-06);font-size:.875rem}
.msg-body{flex:1;min-width:0}
.msg-bubble{font-size:.9375rem;line-height:1.7;word-break:break-word}
.msg-bubble.user{padding:10px 16px;border-radius:16px;background:var(--blue);color:#fff;border-bottom-right-radius:4px}
.msg-bubble.assistant{padding:8px 0;border-radius:0;background:none;border:0}
.msg-bubble.streaming::after{content:'|';animation:blink 1s step-end infinite;color:var(--blue);font-weight:700}
.msg-bubble p{margin-bottom:10px}
.msg-bubble p:last-child{margin-bottom:0}
.msg-bubble pre{background:var(--nav-bg);color:#e2e8f0;padding:14px 16px;border-radius:10px;overflow-x:auto;margin:10px 0;font-family:var(--mono);font-size:.8125rem;line-height:1.55;position:relative}
.msg-bubble code{font-family:var(--mono);font-size:.85em}
.msg-bubble :not(pre)>code{background:var(--ink-06);padding:2px 6px;border-radius:4px;font-size:.875em;color:var(--ink)}
.msg-bubble.user :not(pre)>code{background:rgba(255,255,255,.2);color:#fff}
.msg-bubble .code-copy{position:absolute;top:8px;right:8px;background:rgba(255,255,255,.08);border:1px solid rgba(255,255,255,.15);color:rgba(255,255,255,.5);padding:4px 10px;border-radius:6px;font-size:.6875rem;cursor:pointer;opacity:0;transition:opacity .15s;font-family:var(--font)}
.msg-bubble pre:hover .code-copy{opacity:1}
.msg-bubble .code-copy:hover{background:rgba(255,255,255,.18);color:#fff}
.msg-bubble table{border-collapse:collapse;margin:10px 0;font-size:.875rem;width:100%}
.msg-bubble th,.msg-bubble td{border:1px solid var(--border);padding:6px 12px;text-align:left}
.msg-bubble th{background:var(--ink-06);font-weight:600}
.msg-bubble ul,.msg-bubble ol{padding-left:20px;margin:6px 0}
.msg-bubble blockquote{border-left:3px solid var(--blue);padding-left:12px;margin:8px 0;color:var(--ink-60)}
.msg-bubble.user blockquote{border-left-color:rgba(255,255,255,.5);color:rgba(255,255,255,.8)}
.msg-meta{font-size:.6875rem;color:var(--ink-40);margin-top:2px;display:flex;gap:12px;padding-left:44px}
.msg-row.user .msg-meta{justify-content:flex-end;padding-left:0;padding-right:44px}
.msg-bubble img{max-width:100%;height:auto;border-radius:10px;margin:8px 0;display:block}
/* Input */
.chat-input-area{padding:0 24px 20px;background:var(--white)}
.chat-input-row{display:flex;gap:8px;align-items:flex-end;max-width:820px;margin:0 auto}
#chat-input{flex:1;padding:12px 16px;font-size:.9375rem;font-family:var(--font);border:1.5px solid var(--border);border-radius:14px;resize:none;min-height:50px;max-height:200px;outline:none;transition:border-color .15s;line-height:1.5;box-shadow:0 1px 3px rgba(0,0,0,.04)}
#chat-input:focus{border-color:var(--blue);box-shadow:0 0 0 4px rgba(0,87,255,.08)}
#chat-input:disabled{background:var(--warm);opacity:.7}
.chat-img-btn{width:46px;height:46px;border-radius:12px;border:1.5px solid var(--border);background:var(--white);cursor:pointer;display:flex;align-items:center;justify-content:center;color:var(--ink-40);transition:all .15s;flex-shrink:0}
.chat-img-btn:hover{color:var(--blue);border-color:var(--blue)}
.chat-img-btn:disabled{opacity:.4;cursor:not-allowed}
#send-btn{width:46px;height:46px;border-radius:12px;border:0;background:var(--blue);color:#fff;cursor:pointer;display:flex;align-items:center;justify-content:center;transition:all .15s;flex-shrink:0}
#send-btn:hover{background:var(--blue-hover)}
#send-btn:disabled{opacity:.3;cursor:not-allowed}
#send-btn.stop{background:var(--red)}
#send-btn.stop:hover{background:#b91c1c}
#image-preview-area{padding:0 0 8px;max-width:820px;margin:0 auto}
@keyframes blink{50%{opacity:0}}
/* Mobile */
.chat-mobile-bar{display:none;padding:8px 16px;border-bottom:1px solid var(--border);align-items:center;gap:10px;background:var(--white)}
.chat-mobile-menu-btn{font-size:.8125rem;font-weight:500;color:var(--blue);background:none;border:0;cursor:pointer}
.chat-mobile-title{font-size:.8125rem;font-weight:600;color:var(--ink)}
.chat-sidebar-backdrop{display:none;position:fixed;inset:0;top:60px;background:rgba(0,0,0,.35);z-index:49}
@media(max-width:768px){
  .chat-sidebar{position:fixed;left:-280px;top:60px;bottom:0;z-index:50;transition:left .25s;box-shadow:2px 0 20px rgba(0,0,0,.1)}
  .chat-sidebar.open{left:0}
  .chat-sidebar-backdrop.open{display:block}
  .chat-mobile-bar{display:flex}
  .chat-messages{padding:16px}
  .chat-input-area{padding:0 12px 14px}
  .msg-row{max-width:100%}
  .welcome-hints{grid-template-columns:repeat(2,1fr)}
}

/* ============ ANIMATIONS ============ */
@keyframes fadeInUp{from{opacity:0;transform:translateY(20px)}to{opacity:1;transform:translateY(0)}}
.animate-in{animation:fadeInUp .5s ease forwards}
.stagger-1{animation-delay:.05s}
.stagger-2{animation-delay:.1s}
.stagger-3{animation-delay:.15s}
.stagger-4{animation-delay:.2s}