/* ====================== AIflow Design Tokens ====================== */
:root{
  /* Brand */
  --color-primary: #4F46E5;          /* indigo-600 */
  --color-primary-600: #4338CA;
  --color-primary-50:  #EEF2FF;
  --color-primary-100: #E0E7FF;
  --color-accent: #F97316;           /* orange-500 CTA */
  --color-accent-600: #EA580C;
  --color-accent-50:  #FFF7ED;

  /* Surface */
  --bg-page: #FFFFFF;
  --bg-soft: #F8FAFC;
  --bg-muted: #F1F5F9;
  --bg-subtle: #F9FAFB;

  /* Text */
  --text-strong: #0F172A;            /* slate-900 */
  --text-base:   #1E293B;            /* slate-800 */
  --text-mute:   #475569;            /* slate-600 */
  --text-soft:   #64748B;            /* slate-500 */
  --text-faint:  #94A3B8;            /* slate-400 */

  /* Border */
  --border-base: #E2E8F0;
  --border-strong: #CBD5E1;

  /* Tech accents */
  --grad-tech: linear-gradient(135deg,#6366F1 0%,#8B5CF6 50%,#EC4899 100%);
  --grad-soft: linear-gradient(180deg,#F5F3FF 0%,#FFFFFF 100%);
  --grad-hero: radial-gradient(1200px 600px at 50% -120px, rgba(99,102,241,.18), transparent 60%),
               radial-gradient(900px 480px at 90% -40px, rgba(249,115,22,.10), transparent 60%);

  /* Type */
  --font-display: 'Plus Jakarta Sans','Inter',-apple-system,BlinkMacSystemFont,'PingFang SC','Microsoft YaHei',sans-serif;
  --font-body:    'Inter','Plus Jakarta Sans',-apple-system,BlinkMacSystemFont,'PingFang SC','Microsoft YaHei',sans-serif;

  /* Radius */
  --r-xs: 6px; --r-sm: 10px; --r-md: 14px; --r-lg: 20px; --r-xl: 28px; --r-pill: 999px;

  /* Shadow */
  --sh-sm: 0 1px 2px rgba(15,23,42,.06);
  --sh-md: 0 4px 16px rgba(15,23,42,.06), 0 1px 2px rgba(15,23,42,.04);
  --sh-lg: 0 18px 48px rgba(15,23,42,.10), 0 2px 6px rgba(15,23,42,.05);
  --sh-glow: 0 12px 32px rgba(99,102,241,.18);

  /* Layout */
  --container: 1200px;
  --nav-h: 68px;

  /* Motion */
  --ease-out: cubic-bezier(.22,1,.36,1);
  --dur-fast: 150ms;
  --dur-base: 220ms;
  --dur-slow: 360ms;
}

@media (prefers-reduced-motion: reduce){
  *,*::before,*::after{animation-duration:.01ms !important;animation-iteration-count:1 !important;transition-duration:.01ms !important}
}

/* ====================== Reset ====================== */
*,*::before,*::after{box-sizing:border-box}
html{-webkit-text-size-adjust:100%;-webkit-font-smoothing:antialiased;-moz-osx-font-smoothing:grayscale;scroll-behavior:smooth}
body{margin:0;font-family:var(--font-body);font-size:16px;line-height:1.6;color:var(--text-base);background:var(--bg-page);min-height:100vh}
img,svg{max-width:100%;display:block}
a{color:inherit;text-decoration:none}
button{font:inherit;cursor:pointer;background:none;border:0;color:inherit}
ul,ol{margin:0;padding:0;list-style:none}
h1,h2,h3,h4,h5{font-family:var(--font-display);color:var(--text-strong);margin:0;line-height:1.2;letter-spacing:-.02em;font-weight:700}
h1{font-size:clamp(36px,5.4vw,64px);font-weight:800;letter-spacing:-.03em}
h2{font-size:clamp(28px,3.6vw,44px)}
h3{font-size:clamp(20px,2vw,24px)}
p{margin:0}
:focus-visible{outline:2px solid var(--color-primary);outline-offset:2px;border-radius:4px}

.container{max-width:var(--container);margin:0 auto;padding:0 24px}
.container-narrow{max-width:960px;margin:0 auto;padding:0 24px}

/* ====================== Navbar ====================== */
.nav{position:sticky;top:0;z-index:50;height:var(--nav-h);background:rgba(255,255,255,.78);backdrop-filter:saturate(180%) blur(14px);-webkit-backdrop-filter:saturate(180%) blur(14px);border-bottom:1px solid rgba(226,232,240,.7)}
.nav__inner{display:flex;align-items:center;justify-content:space-between;height:100%;max-width:var(--container);margin:0 auto;padding:0 24px;gap:16px}
.nav__brand{display:flex;align-items:center;gap:10px;font-family:var(--font-display);font-weight:800;font-size:20px;color:var(--text-strong);letter-spacing:-.02em}
.nav__brand img{width:32px;height:32px;border-radius:8px}
.nav__links{display:flex;align-items:center;gap:6px}
.nav__link{padding:10px 14px;border-radius:var(--r-sm);font-size:14px;font-weight:500;color:var(--text-mute);transition:color var(--dur-fast),background var(--dur-fast)}
.nav__link:hover{color:var(--text-strong);background:var(--bg-muted)}
.nav__link.is-active{color:var(--color-primary);background:var(--color-primary-50)}
.nav__right{display:flex;align-items:center;gap:8px}
.lang-toggle{position:relative}
.lang-toggle__btn{display:inline-flex;align-items:center;gap:6px;padding:8px 12px;border:1px solid var(--border-base);border-radius:var(--r-pill);font-size:13px;font-weight:600;color:var(--text-base);background:#fff;transition:all var(--dur-fast)}
.lang-toggle__btn:hover{border-color:var(--color-primary);color:var(--color-primary)}
.lang-toggle__menu{position:absolute;right:0;top:calc(100% + 6px);min-width:160px;background:#fff;border:1px solid var(--border-base);border-radius:var(--r-md);box-shadow:var(--sh-lg);padding:6px;display:none;flex-direction:column;gap:2px}
.lang-toggle.is-open .lang-toggle__menu{display:flex}
.lang-toggle__menu button{padding:9px 12px;border-radius:var(--r-sm);font-size:14px;color:var(--text-base);text-align:left;display:flex;align-items:center;gap:10px}
.lang-toggle__menu button:hover{background:var(--bg-muted)}
.lang-toggle__menu button[aria-current="true"]{background:var(--color-primary-50);color:var(--color-primary);font-weight:600}
.proto-toggle{position:relative}
.proto-toggle__btn{display:inline-flex;align-items:center;gap:4px;background:transparent;border:0;cursor:pointer;font-family:inherit}
.proto-toggle__btn svg{transition:transform var(--dur-fast)}
.proto-toggle.is-open .proto-toggle__btn svg{transform:rotate(180deg)}
.proto-toggle__menu{position:absolute;left:0;top:calc(100% + 6px);min-width:160px;background:#fff;border:1px solid var(--border-base);border-radius:var(--r-md);box-shadow:var(--sh-lg);padding:6px;display:none;flex-direction:column;gap:2px;z-index:60}
.proto-toggle.is-open .proto-toggle__menu{display:flex}
.proto-toggle__menu a{padding:9px 12px;border-radius:var(--r-sm);font-size:14px;font-weight:500;color:var(--text-base);text-align:left;text-decoration:none;display:flex;align-items:center;gap:10px}
.proto-toggle__menu a:hover{background:var(--bg-muted);color:var(--color-primary)}
.nav__mobile-group{display:flex;flex-direction:column;gap:2px;padding:8px 0;border-top:1px solid var(--border-base);border-bottom:1px solid var(--border-base);margin:4px 0}
.nav__mobile-label{padding:6px 14px;font-size:12px;font-weight:600;text-transform:uppercase;letter-spacing:.06em;color:var(--text-soft)}

/* Buttons */
.btn{display:inline-flex;align-items:center;justify-content:center;gap:8px;padding:11px 22px;border-radius:var(--r-pill);font-weight:600;font-size:14px;letter-spacing:.01em;line-height:1;transition:transform var(--dur-fast) var(--ease-out),box-shadow var(--dur-base),background var(--dur-base),color var(--dur-base);min-height:44px;white-space:nowrap;cursor:pointer}
.btn:active{transform:translateY(1px)}
.btn--primary{background:var(--color-accent);color:#fff;box-shadow:0 8px 20px rgba(249,115,22,.28)}
.btn--primary:hover{background:var(--color-accent-600);box-shadow:0 12px 28px rgba(249,115,22,.36)}
.btn--ghost{background:#fff;color:var(--text-strong);border:1px solid var(--border-base)}
.btn--ghost:hover{border-color:var(--color-primary);color:var(--color-primary)}
.btn--soft{background:var(--color-primary-50);color:var(--color-primary)}
.btn--soft:hover{background:var(--color-primary-100)}
.btn--lg{padding:14px 28px;font-size:15px;min-height:50px}
.btn--sm{padding:8px 14px;font-size:13px;min-height:36px}

/* mobile menu */
.nav__burger{display:none;width:40px;height:40px;border-radius:10px;align-items:center;justify-content:center;color:var(--text-strong)}
.nav__burger:hover{background:var(--bg-muted)}
.nav__mobile{display:none;position:fixed;top:var(--nav-h);left:0;right:0;bottom:0;width:100%;height:calc(100vh - var(--nav-h));height:calc(100dvh - var(--nav-h));background:rgba(255,255,255,.98);backdrop-filter:blur(16px);-webkit-backdrop-filter:blur(16px);padding:24px;z-index:60;overflow-y:auto;-webkit-overflow-scrolling:touch;overscroll-behavior:contain}
.nav__mobile.is-open{display:flex;flex-direction:column;gap:2px}
.nav__mobile .nav__link{display:block;padding:14px 16px;font-size:16px;border-radius:var(--r-md)}
.nav__mobile .btn{width:100%;margin-top:12px}
body.nav-open{overflow:hidden}

/* ====================== Hero ====================== */
.hero{position:relative;padding:96px 0 80px;background:var(--grad-hero),var(--bg-page);overflow:hidden}
.hero::before{content:"";position:absolute;inset:0;background-image:linear-gradient(var(--border-base) 1px,transparent 1px),linear-gradient(90deg,var(--border-base) 1px,transparent 1px);background-size:64px 64px;mask-image:radial-gradient(ellipse 60% 50% at 50% 0%,#000 30%,transparent 80%);-webkit-mask-image:radial-gradient(ellipse 60% 50% at 50% 0%,#000 30%,transparent 80%);opacity:.45;pointer-events:none}
.hero__inner{position:relative;text-align:center;max-width:980px;margin:0 auto;padding:0 24px}
.hero__badge{display:inline-flex;align-items:center;gap:8px;padding:6px 14px;border-radius:var(--r-pill);background:#fff;border:1px solid var(--border-base);box-shadow:var(--sh-sm);font-size:13px;font-weight:600;color:var(--text-base);margin-bottom:24px}
.hero__badge .dot{width:8px;height:8px;border-radius:50%;background:#22C55E;box-shadow:0 0 0 3px rgba(34,197,94,.18)}
.hero h1 .grad{background:var(--grad-tech);-webkit-background-clip:text;background-clip:text;color:transparent}
.hero__sub{margin:24px auto 0;max-width:680px;font-size:clamp(15px,1.4vw,18px);color:var(--text-mute);line-height:1.7}
.hero__cta{display:flex;justify-content:center;gap:12px;margin-top:36px;flex-wrap:wrap}
.hero__chips{display:flex;justify-content:center;flex-wrap:wrap;gap:12px;margin-top:32px}
.hero__chip{display:inline-flex;align-items:center;gap:6px;padding:6px 14px;border-radius:var(--r-pill);background:#fff;border:1px solid var(--border-base);font-size:12.5px;color:var(--text-mute);box-shadow:var(--sh-sm)}
.hero__chip svg{color:var(--color-primary)}

/* ====================== Section ====================== */
.section{padding:80px 0}
.section--soft{background:var(--bg-soft)}
.section__head{text-align:center;max-width:760px;margin:0 auto 48px}
.section__head h2 .grad{background:var(--grad-tech);-webkit-background-clip:text;background-clip:text;color:transparent}
.section__lead{margin-top:14px;color:var(--text-mute);font-size:15.5px}

/* feature 3-up */
.grid-3{display:grid;grid-template-columns:repeat(3,1fr);gap:18px}
.grid-2{display:grid;grid-template-columns:1fr 1fr;gap:16px}
.grid-4{display:grid;grid-template-columns:repeat(4,1fr);gap:18px}

/* Card */
.card{background:#fff;border:1px solid var(--border-base);border-radius:var(--r-lg);padding:24px;transition:transform var(--dur-base) var(--ease-out),box-shadow var(--dur-base),border-color var(--dur-base);position:relative}
.card:hover{transform:translateY(-3px);box-shadow:var(--sh-lg);border-color:transparent}
.card__icon{width:44px;height:44px;border-radius:12px;display:flex;align-items:center;justify-content:center;background:var(--color-primary-50);color:var(--color-primary);margin-bottom:16px}
.card__icon--accent{background:var(--color-accent-50);color:var(--color-accent-600)}
.card__title{font-size:17px;font-weight:700;color:var(--text-strong);margin-bottom:8px;font-family:var(--font-display)}
.card__desc{font-size:14px;color:var(--text-mute);line-height:1.65}
.card__tag{position:absolute;top:14px;right:14px;padding:3px 9px;border-radius:var(--r-pill);font-size:11px;font-weight:600;background:#DCFCE7;color:#166534}

/* metric strip */
.metrics{display:grid;grid-template-columns:repeat(4,1fr);gap:0;border:1px solid var(--border-base);border-radius:var(--r-lg);background:#fff;overflow:hidden}
.metric{padding:24px;text-align:center;border-right:1px solid var(--border-base)}
.metric:last-child{border-right:0}
.metric__num{font-family:var(--font-display);font-weight:800;font-size:30px;color:var(--text-strong);background:var(--grad-tech);-webkit-background-clip:text;background-clip:text;color:transparent}
.metric__label{font-size:13px;color:var(--text-mute);margin-top:4px}

/* compare two-col */
.compare{display:grid;grid-template-columns:1fr 1fr;gap:18px}
.compare__col{background:#fff;border:1px solid var(--border-base);border-radius:var(--r-lg);padding:24px}
.compare__col--active{border-color:var(--color-accent);box-shadow:0 0 0 3px var(--color-accent-50)}
.compare__col h3{margin-bottom:16px}
.compare__list{display:flex;flex-direction:column;gap:10px}
.compare__list li{display:flex;align-items:flex-start;gap:10px;font-size:14px;color:var(--text-mute)}
.compare__list li svg{flex-shrink:0;margin-top:3px}
.compare__col--active .compare__list li{color:var(--text-base)}

/* dark band */
.band{background:#0B1020;border-radius:var(--r-xl);color:#E2E8F0;padding:36px;display:grid;grid-template-columns:1.4fr 1fr;gap:36px;align-items:center;background-image:radial-gradient(800px 200px at 90% 20%,rgba(99,102,241,.25),transparent 60%),radial-gradient(700px 240px at 0% 100%,rgba(236,72,153,.16),transparent 60%)}
.band h3{color:#fff;font-size:22px;margin-bottom:8px}
.band p{color:#94A3B8;font-size:14.5px;line-height:1.7}
.band__visual{display:flex;justify-content:center}
.band__visual .core{width:160px;height:160px;border-radius:50%;background:var(--grad-tech);box-shadow:0 0 80px rgba(99,102,241,.5);position:relative;display:flex;align-items:center;justify-content:center;color:#fff;font-weight:800;font-size:18px}
.band__visual .core::after{content:"";position:absolute;inset:-20px;border-radius:50%;border:1px dashed rgba(255,255,255,.18);animation:spin 24s linear infinite}
@keyframes spin{to{transform:rotate(360deg)}}

/* Pricing */
.pricing{display:grid;grid-template-columns:repeat(4,1fr);gap:18px}
.plan{background:#fff;border:1px solid var(--border-base);border-radius:var(--r-lg);padding:28px;display:flex;flex-direction:column;gap:14px;position:relative;transition:transform var(--dur-base) var(--ease-out),box-shadow var(--dur-base)}
.plan:hover{transform:translateY(-3px);box-shadow:var(--sh-lg)}
.plan--featured{border-color:var(--color-accent);box-shadow:0 0 0 3px var(--color-accent-50);transform:scale(1.02)}
.plan--featured:hover{transform:scale(1.02) translateY(-3px)}
.plan__badge{position:absolute;top:-12px;left:50%;transform:translateX(-50%);background:var(--color-accent);color:#fff;font-size:12px;padding:4px 12px;border-radius:var(--r-pill);font-weight:600}
.plan__name{font-family:var(--font-display);font-weight:700;font-size:20px;color:var(--text-strong)}
.plan__sub{font-size:13px;color:var(--text-mute)}
.plan__price{display:flex;align-items:baseline;gap:6px;margin:8px 0 4px}
.plan__price .amount{font-family:var(--font-display);font-size:36px;font-weight:800;color:var(--text-strong);letter-spacing:-.02em}
.plan__price .unit{font-size:13px;color:var(--text-mute)}
.plan__feat{display:flex;flex-direction:column;gap:8px;margin-top:6px;font-size:14px;color:var(--text-mute)}
.plan__feat li{display:flex;align-items:flex-start;gap:8px}
.plan__feat svg{color:#10B981;flex-shrink:0;margin-top:3px}
.plan .btn{margin-top:auto}

/* Testimonials */
.testi{display:grid;grid-template-columns:repeat(3,1fr);gap:16px}
.testi__card{background:#fff;border:1px solid var(--border-base);border-radius:var(--r-lg);padding:24px;display:flex;flex-direction:column;gap:14px}
.testi__quote{font-size:14.5px;color:var(--text-base);line-height:1.7}
.testi__person{display:flex;align-items:center;gap:10px;margin-top:auto}
.testi__avatar{width:40px;height:40px;border-radius:50%;background:var(--grad-tech);color:#fff;display:flex;align-items:center;justify-content:center;font-weight:700;font-size:14px}
.testi__name{font-weight:600;font-size:14px;color:var(--text-strong)}
.testi__role{font-size:12.5px;color:var(--text-soft)}

/* Trusted */
.trust{display:flex;justify-content:center;align-items:center;flex-wrap:wrap;gap:48px;opacity:.6}
.trust span{font-family:var(--font-display);font-weight:700;font-size:18px;letter-spacing:.02em;color:var(--text-mute)}

/* FAQ */
.faq{max-width:820px;margin:0 auto}
.faq__item{background:#fff;border:1px solid var(--border-base);border-radius:var(--r-md);margin-bottom:10px;overflow:hidden}
.faq__q{display:flex;align-items:center;justify-content:space-between;width:100%;padding:18px 22px;font-weight:600;color:var(--text-strong);font-size:15px;text-align:left}
.faq__q::after{content:"";width:14px;height:14px;border-right:2px solid var(--text-mute);border-bottom:2px solid var(--text-mute);transform:rotate(45deg);transition:transform var(--dur-base);margin-bottom:4px}
.faq__item.is-open .faq__q::after{transform:rotate(-135deg);margin-top:6px;margin-bottom:0}
.faq__a{padding:0 22px 18px;color:var(--text-mute);font-size:14.5px;line-height:1.7;display:none}
.faq__item.is-open .faq__a{display:block}

/* Footer */
.footer{background:#0B1020;color:#94A3B8;padding:56px 0 28px;margin-top:80px}
.footer__grid{display:grid;grid-template-columns:1.4fr repeat(3,1fr);gap:32px;padding-bottom:32px;border-bottom:1px solid rgba(255,255,255,.08)}
.footer__brand{display:flex;align-items:center;gap:10px;color:#fff;font-family:var(--font-display);font-weight:800;font-size:20px;margin-bottom:12px}
.footer__brand img{width:32px;height:32px;border-radius:8px;background:#fff;padding:2px}
.footer p{font-size:13.5px;line-height:1.7;color:#94A3B8;max-width:320px}
.footer__col h4{color:#fff;font-size:14px;font-weight:700;margin-bottom:12px;font-family:var(--font-display)}
.footer__col li{margin-bottom:8px}
.footer__col a{color:#94A3B8;font-size:13.5px;transition:color var(--dur-fast)}
.footer__col a:hover{color:#fff}
.footer__bot{display:flex;justify-content:space-between;align-items:center;padding-top:22px;font-size:12.5px;color:#64748B;flex-wrap:wrap;gap:12px}

/* ===== 模型广场 ===== */
.models{display:grid;grid-template-columns:240px 1fr;gap:28px;align-items:start}
.filter{background:#fff;border:1px solid var(--border-base);border-radius:var(--r-lg);padding:18px;position:sticky;top:calc(var(--nav-h) + 16px)}
.filter h4{font-size:13px;text-transform:uppercase;letter-spacing:.06em;color:var(--text-soft);margin-bottom:10px;margin-top:18px;font-weight:700}
.filter h4:first-child{margin-top:0}
.filter ul li{padding:8px 10px;border-radius:var(--r-sm);font-size:14px;color:var(--text-mute);cursor:pointer;display:flex;justify-content:space-between;align-items:center;transition:background var(--dur-fast)}
.filter ul li:hover{background:var(--bg-muted);color:var(--text-strong)}
.filter ul li.is-active{background:var(--color-primary-50);color:var(--color-primary);font-weight:600}
.filter ul li .count{font-size:12px;color:var(--text-faint)}

.model-list{display:flex;flex-direction:column;gap:10px}
.model-row{display:grid;grid-template-columns:1fr 200px 200px;gap:16px;align-items:center;padding:18px 20px;background:#fff;border:1px solid var(--border-base);border-radius:var(--r-md);transition:border-color var(--dur-fast),box-shadow var(--dur-base)}
.model-row:hover{border-color:var(--color-primary);box-shadow:var(--sh-md)}
.model-meta{display:flex;flex-direction:column;gap:4px;min-width:0}
.model-name{display:flex;align-items:center;gap:10px;font-weight:700;color:var(--text-strong);font-size:15px;font-family:var(--font-display)}
.model-name .vendor{padding:2px 8px;border-radius:6px;background:var(--color-primary-50);color:var(--color-primary);font-size:11.5px;font-weight:600;font-family:var(--font-body)}
.model-tags{display:flex;gap:6px;flex-wrap:wrap}
.model-tags span{font-size:11px;color:var(--text-soft);background:var(--bg-muted);padding:2px 8px;border-radius:6px}
.model-price{font-family:var(--font-display);font-weight:700;color:var(--text-base);font-size:14px;text-align:right;white-space:nowrap;font-variant-numeric:tabular-nums}
.model-price small{color:var(--text-soft);font-weight:500;font-size:11.5px;font-family:var(--font-body);margin:0 4px}
.model-price small:first-child{margin-left:0}
.model-price small:last-child{margin-right:0}

/* ===== Skills 广场 ===== */
.skills-hero{background:linear-gradient(135deg,#EEF2FF 0%,#FCE7F3 100%);border-radius:var(--r-xl);padding:48px;display:grid;grid-template-columns:1.3fr 1fr;align-items:center;gap:32px;margin-bottom:32px;position:relative;overflow:hidden}
.skills-hero::before{content:"";position:absolute;inset:0;background-image:linear-gradient(rgba(99,102,241,.08) 1px,transparent 1px),linear-gradient(90deg,rgba(99,102,241,.08) 1px,transparent 1px);background-size:32px 32px;pointer-events:none}
.skills-hero h1{position:relative;font-size:clamp(30px,3.6vw,42px);margin-bottom:14px}
.skills-hero p{position:relative;color:var(--text-mute);max-width:480px}
.skills-hero__visual{position:relative;background:#0B1020;border-radius:var(--r-lg);padding:24px;color:#E2E8F0;font-family:'JetBrains Mono','SF Mono',Menlo,monospace;font-size:13px;line-height:1.7;box-shadow:var(--sh-lg)}
.skills-hero__visual b{color:#A5B4FC;font-weight:500}
.skills-tabs{display:flex;align-items:center;gap:8px;margin-bottom:20px;flex-wrap:wrap}
.skills-tab{padding:8px 14px;border-radius:var(--r-pill);font-size:13.5px;color:var(--text-mute);border:1px solid var(--border-base);background:#fff;cursor:pointer;transition:all var(--dur-fast);font-weight:500}
.skills-tab:hover{color:var(--text-strong);border-color:var(--color-primary)}
.skills-tab.is-active{background:var(--text-strong);color:#fff;border-color:var(--text-strong)}
.skills-search{margin-left:auto;display:flex;align-items:center;gap:8px;background:#fff;border:1px solid var(--border-base);padding:8px 12px;border-radius:var(--r-pill);min-width:240px}
.skills-search input{border:0;outline:0;font-size:13.5px;width:100%;background:transparent;color:var(--text-base)}
.skills-grid{display:grid;grid-template-columns:repeat(3,1fr);gap:16px}
.skill-card{background:#fff;border:1px solid var(--border-base);border-radius:var(--r-md);padding:20px;display:flex;flex-direction:column;gap:12px;transition:all var(--dur-base) var(--ease-out)}
.skill-card:hover{transform:translateY(-3px);box-shadow:var(--sh-lg);border-color:transparent}
.skill-card__top{display:flex;align-items:center;justify-content:space-between}
.skill-card__title{display:flex;align-items:center;gap:10px;font-family:var(--font-display);font-weight:700;font-size:16px;color:var(--text-strong)}
.skill-card__title .ico{width:34px;height:34px;border-radius:10px;display:flex;align-items:center;justify-content:center;background:var(--grad-tech);color:#fff;font-size:16px;font-weight:700}
.skill-card__downloads{display:inline-flex;align-items:center;gap:4px;color:var(--text-soft);font-size:12px}
.skill-card__desc{font-size:13.5px;color:var(--text-mute);line-height:1.65;flex:1}
.skill-card__tags{display:flex;gap:6px;flex-wrap:wrap}
.skill-card__tags span{font-size:11.5px;color:var(--color-primary);background:var(--color-primary-50);padding:2px 8px;border-radius:6px;font-weight:600}
.skill-card__bot{display:flex;justify-content:space-between;align-items:center;padding-top:12px;border-top:1px solid var(--border-base)}
.skill-card__author{display:flex;align-items:center;gap:8px;font-size:12.5px;color:var(--text-soft)}
.skill-card__author .ava{width:24px;height:24px;border-radius:50%;background:var(--grad-tech)}

/* ===== Agent 协作 ===== */
.workflow-grid{display:grid;grid-template-columns:repeat(3,1fr);gap:20px}
.wf-card{background:#fff;border:1px solid var(--border-base);border-radius:var(--r-lg);overflow:hidden;display:flex;flex-direction:column;transition:all var(--dur-base) var(--ease-out)}
.wf-card:hover{transform:translateY(-4px);box-shadow:var(--sh-lg);border-color:transparent}
.wf-card__cover{height:160px;display:flex;align-items:center;justify-content:center;color:#fff;font-family:var(--font-display);font-weight:700;font-size:20px;position:relative;overflow:hidden}
.wf-card__cover::after{content:"";position:absolute;inset:0;background-image:linear-gradient(rgba(255,255,255,.12) 1px,transparent 1px),linear-gradient(90deg,rgba(255,255,255,.12) 1px,transparent 1px);background-size:24px 24px;mask-image:radial-gradient(ellipse at center,#000 30%,transparent 70%);-webkit-mask-image:radial-gradient(ellipse at center,#000 30%,transparent 70%)}
.wf-card__cover .badge{position:absolute;top:12px;left:12px;padding:4px 10px;border-radius:var(--r-pill);background:rgba(255,255,255,.18);backdrop-filter:blur(8px);font-size:11.5px;font-weight:600;letter-spacing:.04em}
.wf-card__cover svg{position:relative;width:54px;height:54px}
.wf-card__body{padding:20px;display:flex;flex-direction:column;gap:10px;flex:1}
.wf-card__title{font-family:var(--font-display);font-weight:700;font-size:18px;color:var(--text-strong)}
.wf-card__desc{font-size:14px;color:var(--text-mute);line-height:1.65;flex:1}
.wf-card__feats{display:flex;flex-direction:column;gap:6px;margin-top:6px}
.wf-card__feats li{display:flex;align-items:flex-start;gap:8px;font-size:13px;color:var(--text-mute)}
.wf-card__feats svg{color:var(--color-primary);flex-shrink:0;margin-top:3px}
.wf-card__bot{display:flex;justify-content:space-between;align-items:center;padding-top:12px;border-top:1px solid var(--border-base);margin-top:6px}
.wf-card__tag{font-size:12px;color:var(--color-primary);font-weight:600}

/* covers (gradients) */
.cv-1{background:linear-gradient(135deg,#6366F1,#8B5CF6)}
.cv-2{background:linear-gradient(135deg,#10B981,#06B6D4)}
.cv-3{background:linear-gradient(135deg,#F97316,#EAB308)}
.cv-4{background:linear-gradient(135deg,#EC4899,#8B5CF6)}
.cv-5{background:linear-gradient(135deg,#3B82F6,#10B981)}
.cv-6{background:linear-gradient(135deg,#0EA5E9,#6366F1)}

/* page hero light */
.page-hero{padding:64px 0 32px;background:var(--grad-soft);border-bottom:1px solid var(--border-base)}
.page-hero h1{font-size:clamp(28px,3.4vw,42px);margin-bottom:12px;text-align:center}
.page-hero p{text-align:center;max-width:680px;margin:0 auto;color:var(--text-mute)}

/* ====================== Responsive ====================== */
@media (max-width: 1024px){
  .grid-3,.grid-4,.pricing,.testi,.skills-grid,.workflow-grid{grid-template-columns:repeat(2,1fr)}
  .band{grid-template-columns:1fr;text-align:center}
  .band__visual{margin:0 auto}
  .compare,.skills-hero{grid-template-columns:1fr}
  .models{grid-template-columns:1fr}
  .filter{position:static}
  .footer__grid{grid-template-columns:repeat(2,1fr)}
  .metrics{grid-template-columns:repeat(2,1fr)}
  .metric{border-right:0;border-bottom:1px solid var(--border-base)}
  .metric:nth-child(odd){border-right:1px solid var(--border-base)}
  .metric:nth-last-child(-n+2){border-bottom:0}
}
@media (max-width: 720px){
  :root{--nav-h:60px}
  .nav__links{display:none}
  .nav__burger{display:inline-flex}
  .lang-toggle__btn{padding:6px 10px}
  .nav__right .btn{padding:8px 14px;font-size:13px;min-height:36px}
  .hero{padding:64px 0 56px}
  .section{padding:56px 0}
  .grid-3,.grid-2,.grid-4,.pricing,.testi,.skills-grid,.workflow-grid{grid-template-columns:1fr}
  .footer__grid{grid-template-columns:1fr 1fr;gap:20px}
  .footer__col:first-child{grid-column:1/-1}
  .metrics{grid-template-columns:repeat(2,1fr)}
  .skills-tabs{flex-direction:column;align-items:stretch}
  .skills-search{margin-left:0;width:100%}
  .model-row{grid-template-columns:1fr;gap:8px}
  .model-price{text-align:left}
  .band{padding:24px}
  .skills-hero{padding:24px}
}

/* visually hidden */
.sr-only{position:absolute;width:1px;height:1px;padding:0;margin:-1px;overflow:hidden;clip:rect(0,0,0,0);border:0}

/* ===== Token Hero (homepage) ===== */
.hero--token{padding:0;min-height:calc(100vh - var(--nav-h));min-height:calc(100dvh - var(--nav-h));display:flex;align-items:stretch;justify-content:center}
.hero--token .hero__inner{max-width:var(--container);width:100%;padding:48px 24px;display:flex;flex-direction:column;justify-content:space-between;align-items:center}
.hero--token h1{font-size:clamp(34px,4.4vw,56px);line-height:1.1;letter-spacing:-.02em}
.hero__top{width:100%;display:flex;flex-direction:column;align-items:center;justify-content:center;flex:1;min-height:0}
.hero__mid{width:100%;align-items:center;justify-content:center;flex:1;min-height:0;padding:24px 0}
.hero__mid .chat-box{margin-top:0}
.hero__bot{width:100%;display:flex;justify-content:center}
.hero__sub--lg{font-size:clamp(20px,2.4vw,30px);font-weight:700;font-family:var(--font-display);max-width:760px;margin:14px auto 0;line-height:1.25}
.hero__desc{margin:18px auto 0;max-width:720px;font-size:15px;color:var(--text-mute);line-height:1.7}

/* Chat box — minimal pill input inspired by b.ai */
.chat-box{margin:40px auto 0;width:100%;max-width:780px;background:transparent;border:1px solid var(--border-base);border-radius:9999px;box-shadow:0 1px 2px rgba(15,23,42,.04);padding:8px 8px 8px 24px;display:flex;align-items:center;gap:12px;transition:border-color var(--dur-fast),box-shadow var(--dur-base)}
.chat-box:focus-within{border-color:var(--color-primary);box-shadow:0 4px 16px -6px rgba(79,70,229,.18)}
.chat-box__input{flex:1;min-width:0;border:0;outline:0;resize:none;padding:14px 0;font-family:var(--font-body);font-size:15px;line-height:1.5;color:var(--text-base);background:transparent;max-height:160px;overflow-y:auto}
.chat-box__input::placeholder{color:var(--text-soft)}
.chat-box__send{flex-shrink:0;width:44px;height:44px;border-radius:50%;border:0;background:var(--text-strong);color:#fff;display:inline-flex;align-items:center;justify-content:center;cursor:pointer;transition:background var(--dur-fast),transform var(--dur-fast)}
.chat-box__send:hover{background:var(--color-primary)}
.chat-box__send:active{transform:scale(.94)}
.chat-suggest{display:flex;flex-wrap:wrap;justify-content:center;gap:8px;margin:18px auto 0;max-width:780px}
.chip-suggest{border:1px solid var(--border-base);background:#fff;color:var(--text-mute);padding:7px 14px;border-radius:var(--r-pill);font-size:13px;cursor:pointer;transition:all var(--dur-fast);font-family:inherit}
.chip-suggest:hover{border-color:var(--color-primary);color:var(--color-primary);background:var(--color-primary-50)}

/* Hub category quick links */
.hub-cats{display:grid;grid-template-columns:repeat(6,1fr);gap:12px}
.hub-cat{display:flex;align-items:center;gap:12px;padding:14px 16px;background:#fff;border:1px solid var(--border-base);border-radius:var(--r-md);text-decoration:none;color:var(--text-base);transition:all var(--dur-fast)}
.hub-cat:hover{border-color:var(--color-primary);box-shadow:var(--sh-md);transform:translateY(-2px)}
.hub-cat__ico{width:40px;height:40px;border-radius:12px;display:flex;align-items:center;justify-content:center;color:#fff;font-size:18px;flex-shrink:0}
.hub-cat__t{font-family:var(--font-display);font-weight:700;font-size:14px;color:var(--text-strong)}
.hub-cat__c{font-size:11.5px;color:var(--text-soft);margin-top:2px}

/* Vendor logo badge */
.vendor-logo{width:28px;height:28px;border-radius:8px;display:inline-flex;align-items:center;justify-content:center;flex-shrink:0;overflow:hidden;border:1px solid var(--border-base);background:#fff}
.vendor-logo svg{width:18px;height:18px;display:block}
.vendor-logo img{width:100%;height:100%;display:block;object-fit:contain}
.vendor-logo__letter{color:#fff;font-family:var(--font-display);font-weight:700;font-size:13px;line-height:1}

/* Responsive overrides for new components */
@media (max-width: 1024px){
  .hub-cats{grid-template-columns:repeat(3,1fr)}
}
@media (max-width: 720px){
  .hero--token{min-height:auto;padding:24px 0}
  .hero--token .hero__inner{padding:32px 24px;gap:24px}
  .hero__mid{flex:0 0 auto;padding:0}
  .chat-box{margin-top:0;padding:6px 6px 6px 18px;gap:8px}
  .chat-box__input{font-size:14px;padding:12px 0}
  .chat-box__send{width:40px;height:40px}
  .hub-cats{grid-template-columns:repeat(2,1fr)}
}