/* ============ TOKENS (LIGHT THEME · BLUE-DOMINANT) ============ */
:root{
  /* blue family — "orange*" vars remapped to blues so all accents stay in the blue palette */
  --orange:#0EA5E9;      /* sky-cyan (gradient warm end) */
  --orange-2:#1E50C8;    /* deep blue for text accents on light */
  --orange-3:#7DD3FC;    /* light sky */
  --blue:#2563EB;        /* Zhipu blue — primary */
  --blue-2:#3B82F6;
  --blue-3:#1E4FD1;      /* deeper for text on light */
  --bg:#f5f7fc;
  --bg-2:#eaf0fb;
  --bg-3:#ffffff;
  --panel:#ffffff;
  --panel-2:#fafcff;
  --line:rgba(20,40,90,.10);
  --line-2:rgba(20,40,90,.17);
  --txt:#111a2e;
  --txt-2:#465170;
  --txt-3:#7d88a6;
  --grad:linear-gradient(120deg,#0EA5E9 0%,#38BDF8 26%,#3B82F6 68%,#2563EB 100%);
  --grad-soft:linear-gradient(120deg,rgba(14,165,233,.12),rgba(37,99,235,.14));
  --radius:18px;
  --shadow:0 26px 60px -30px rgba(23,52,140,.45);
  --shadow-sm:0 12px 30px -18px rgba(23,52,140,.38);
  --mono:'JetBrains Mono',ui-monospace,monospace;
  --sans:'Inter','Noto Sans SC',system-ui,sans-serif;
}
*{box-sizing:border-box;margin:0;padding:0}
html{scroll-behavior:smooth}
body{
  font-family:var(--sans);background:var(--bg);color:var(--txt);
  line-height:1.6;overflow-x:hidden;-webkit-font-smoothing:antialiased;
}
a{color:inherit;text-decoration:none}
.container{width:min(1200px,92vw);margin-inline:auto}
.grad-text{background:var(--grad);-webkit-background-clip:text;background-clip:text;color:transparent}
.eyebrow{
  display:inline-block;font-size:.78rem;font-weight:700;letter-spacing:.18em;text-transform:uppercase;
  color:var(--orange-2);padding:.35rem .8rem;border:1px solid var(--line-2);border-radius:100px;
  background:var(--grad-soft);margin-bottom:1.1rem;
}

/* ============ BUTTONS ============ */
.btn{
  display:inline-flex;align-items:center;gap:.5rem;font-weight:600;font-size:.92rem;
  padding:.72rem 1.3rem;border-radius:12px;border:1px solid transparent;cursor:pointer;
  transition:.25s cubic-bezier(.4,0,.2,1);white-space:nowrap;
}
.btn--lg{padding:.95rem 1.7rem;font-size:1rem}
.btn--primary{background:var(--grad);color:#fff;box-shadow:0 14px 30px -12px rgba(37,99,235,.5)}
.btn--primary:hover{transform:translateY(-2px);box-shadow:0 20px 42px -12px rgba(37,99,235,.5)}
.btn--ghost{background:#fff;border-color:var(--line-2);color:var(--txt)}
.btn--ghost:hover{background:#fff;border-color:var(--orange);box-shadow:var(--shadow-sm)}

/* ============ NAV ============ */
.nav{position:fixed;inset:0 0 auto 0;z-index:50;transition:.3s}
.nav.scrolled{background:rgba(255,255,255,.82);backdrop-filter:blur(16px);border-bottom:1px solid var(--line);box-shadow:0 6px 24px -18px rgba(37,54,120,.4)}
.nav__inner{display:flex;align-items:center;justify-content:space-between;height:72px;gap:1.5rem}
.brand{display:flex;align-items:center;gap:.6rem;font-weight:800;font-size:1.1rem}
.brand__logo{width:38px;height:38px;border-radius:10px;object-fit:cover;box-shadow:0 8px 20px -8px rgba(37,99,235,.45)}
.brand__text em{font-style:normal;font-weight:600;color:var(--txt-2);font-size:.82rem;letter-spacing:.02em}
.nav__links{display:flex;gap:1.7rem;font-size:.92rem;color:var(--txt-2);font-weight:500}
.nav__links a{position:relative;transition:.2s}
.nav__links a:hover{color:var(--txt)}
.nav__links a::after{content:"";position:absolute;left:0;bottom:-6px;width:0;height:2px;background:var(--grad);transition:.25s}
.nav__links a:hover::after{width:100%}
.nav__cta{display:flex;gap:.6rem}
.nav__burger{display:none;flex-direction:column;gap:5px;background:none;border:0;cursor:pointer;padding:6px}
.nav__burger span{width:24px;height:2px;background:var(--txt);border-radius:2px;transition:.3s}

/* ============ HERO ============ */
.hero{position:relative;padding:150px 0 70px;overflow:hidden;
  background:
   linear-gradient(180deg,rgba(246,247,251,.72),rgba(246,247,251,.9)),
   url('img/bg-warm.png') center top/cover no-repeat,
   var(--bg);}
.hero__code{position:absolute;inset:0;background:url('img/hero-bg.png') center/cover;opacity:.06}
.hero__grid{position:absolute;inset:0;
  background-image:linear-gradient(var(--line) 1px,transparent 1px),linear-gradient(90deg,var(--line) 1px,transparent 1px);
  background-size:48px 48px;mask-image:radial-gradient(circle at 50% 25%,#000,transparent 72%);opacity:.55}
.hero__inner{position:relative;display:grid;grid-template-columns:1.15fr .85fr;gap:3rem;align-items:center}
.badge-pill{display:inline-flex;align-items:center;gap:.55rem;font-size:.85rem;color:var(--txt-2);
  padding:.45rem .9rem;border:1px solid var(--line-2);border-radius:100px;background:rgba(255,255,255,.7);margin-bottom:1.4rem;box-shadow:var(--shadow-sm)}
.badge-pill strong{color:var(--orange-2)}
.badge-pill .dot{width:8px;height:8px;border-radius:50%;background:#20b880;box-shadow:0 0 0 0 rgba(32,184,128,.6);animation:pulse 2s infinite}
@keyframes pulse{0%{box-shadow:0 0 0 0 rgba(32,184,128,.5)}70%{box-shadow:0 0 0 9px rgba(32,184,128,0)}100%{box-shadow:0 0 0 0 rgba(32,184,128,0)}}
.hero__title{font-size:clamp(2.4rem,5.4vw,4rem);line-height:1.08;font-weight:900;letter-spacing:-.02em}
.hero__sub{margin:1.4rem 0 2rem;color:var(--txt-2);font-size:1.05rem;max-width:36rem}
.hero__sub b{color:var(--txt);font-weight:600}
.hero__actions{display:flex;gap:.9rem;flex-wrap:wrap}
.hero__stats{display:grid;grid-template-columns:repeat(4,auto);gap:2rem;margin-top:2.6rem}
.hero__stats div{display:flex;flex-direction:column}
.hero__stats b{font-size:1.7rem;font-weight:800;background:var(--grad);-webkit-background-clip:text;background-clip:text;color:transparent}
.hero__stats span{font-size:.78rem;color:var(--txt-3)}

/* reveal card */
.reveal{position:relative}
.reveal__front{position:relative;aspect-ratio:1/1;border-radius:26px;overflow:hidden;border:1px solid var(--line-2);
  background:
    radial-gradient(120% 120% at 30% 20%,rgba(56,189,248,.5),transparent 55%),
    radial-gradient(120% 120% at 80% 80%,rgba(96,165,250,.5),transparent 55%),
    #fff;
  box-shadow:var(--shadow);cursor:crosshair;
  -webkit-mask-image:radial-gradient(circle var(--mr,0px) at var(--mx,50%) var(--my,50%),transparent 0,transparent calc(var(--mr,0px) - 42px),#000 var(--mr,0px));
  mask-image:radial-gradient(circle var(--mr,0px) at var(--mx,50%) var(--my,50%),transparent 0,transparent calc(var(--mr,0px) - 42px),#000 var(--mr,0px));
}
.reveal::before{content:"";position:absolute;inset:0;border-radius:26px;z-index:-1;
  background:url('img/hero-bg.png') center/cover,#fff;border:1px solid var(--line-2);
  box-shadow:inset 0 0 60px rgba(37,54,120,.12)}
.reveal__front img{width:100%;height:100%;object-fit:cover;display:block}
.reveal__glow{position:absolute;inset:0;background:linear-gradient(160deg,transparent 45%,rgba(96,165,250,.18));pointer-events:none}
.reveal__hint{position:absolute;bottom:-2.4rem;left:0;right:0;text-align:center;font-size:.82rem;color:var(--txt-3);
  display:flex;align-items:center;justify-content:center;gap:.5rem}
.cursor-ico{width:14px;height:14px;border:2px solid var(--orange);border-radius:50%;position:relative}
.cursor-ico::after{content:"";position:absolute;inset:3px;border-radius:50%;background:var(--blue)}

.hero__logos{position:relative;margin-top:5rem;display:flex;flex-direction:column;align-items:center;gap:1.1rem}
.hero__logos>span{font-size:.78rem;letter-spacing:.16em;text-transform:uppercase;color:var(--txt-3)}
.hero__logos-row{display:flex;flex-wrap:wrap;gap:1.4rem;justify-content:center;align-items:center}
.hero__logos-row .tlogo{display:flex;align-items:center;gap:.5rem;color:var(--txt-2);font-weight:600;font-size:.9rem;
  padding:.5rem .9rem;border:1px solid var(--line);border-radius:12px;background:rgba(255,255,255,.85);transition:.25s;box-shadow:var(--shadow-sm)}
.hero__logos-row .tlogo:hover{border-color:var(--orange);color:var(--txt);transform:translateY(-2px)}
.hero__logos-row .tlogo svg{width:20px;height:20px}

/* ============ STRIP ============ */
.strip{border-block:1px solid var(--line);background:rgba(255,255,255,.7)}
.strip__inner{display:flex;flex-wrap:wrap;justify-content:space-between;gap:1rem;padding:1.6rem 0}
.strip__item{display:flex;flex-direction:column;align-items:center;flex:1;min-width:130px}
.strip__k{font-weight:800;font-size:1.05rem}
.strip__v{font-size:.8rem;color:var(--txt-3);font-family:var(--mono)}

/* ============ SECTIONS ============ */
.section{padding:100px 0;position:relative}
.section__head{text-align:center;max-width:44rem;margin:0 auto 3.4rem;position:relative}
.section__head h2{font-size:clamp(1.8rem,3.8vw,2.7rem);font-weight:900;letter-spacing:-.02em;line-height:1.15}
.section__head p{margin-top:1rem;color:var(--txt-2);font-size:1.05rem}
.section .container{position:relative}
/* per-section soft background images */
#features{background:linear-gradient(rgba(246,247,251,.86),rgba(246,247,251,.93)),url('img/bg-mesh.png') center/cover fixed}
#pricing{background:linear-gradient(rgba(238,241,248,.84),rgba(238,241,248,.92)),url('img/bg-cool.png') center/cover fixed}
#models{background:linear-gradient(rgba(246,247,251,.87),rgba(246,247,251,.94)),url('img/bg-warm.png') center/cover fixed}
#tools{background:linear-gradient(rgba(238,241,248,.82),rgba(238,241,248,.9)),url('img/bg-tools.png') center/cover fixed}
#formats{background:linear-gradient(rgba(246,247,251,.88),rgba(246,247,251,.95)),url('img/bg-mesh.png') center/cover fixed}

/* ============ card spotlight (shared) ============ */
.glow{--mx:50%;--my:50%;position:relative;overflow:hidden}
.glow::after{content:"";position:absolute;inset:0;border-radius:inherit;pointer-events:none;z-index:2;opacity:0;transition:opacity .35s;
  background:radial-gradient(360px circle at var(--mx) var(--my),rgba(14,165,233,.18),rgba(37,99,235,.12) 35%,transparent 62%)}
.glow:hover::after{opacity:1}
/* animated gradient ring on hover */
.glow::before{content:"";position:absolute;inset:0;border-radius:inherit;padding:1.4px;pointer-events:none;z-index:1;opacity:0;transition:opacity .35s;
  background:conic-gradient(from var(--a,0deg),var(--orange),var(--blue-2),var(--orange-3),var(--blue),var(--orange));
  -webkit-mask:linear-gradient(#000 0 0) content-box,linear-gradient(#000 0 0);-webkit-mask-composite:xor;mask-composite:exclude}
.glow:hover::before{opacity:1;animation:spin 4s linear infinite}
@keyframes spin{to{--a:360deg}}
@property --a{syntax:'<angle>';initial-value:0deg;inherits:false}

/* features */
.features{display:grid;grid-template-columns:repeat(3,1fr);gap:1.3rem}
.feature-card{background:linear-gradient(180deg,var(--panel),var(--panel-2));border:1px solid var(--line);
  border-radius:var(--radius);padding:2rem 1.7rem;transition:transform .3s,box-shadow .3s;box-shadow:var(--shadow-sm)}
.feature-card:hover{transform:translateY(-6px);box-shadow:var(--shadow)}
.feature-card>*{position:relative;z-index:3}
.feature-card__ico{width:52px;height:52px;border-radius:14px;background:var(--grad);margin-bottom:1.1rem;
  display:grid;place-items:center;box-shadow:0 12px 26px -12px rgba(37,99,235,.55)}
.feature-card__ico::after{content:"";width:26px;height:26px;background:#fff;-webkit-mask:var(--i) center/contain no-repeat;mask:var(--i) center/contain no-repeat}
.ico-shield{--i:url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' viewBox='0 0 24 24' fill='none' stroke='black' stroke-width='2'%3E%3Cpath d='M12 2l8 4v6c0 5-3.5 8-8 10-4.5-2-8-5-8-10V6z'/%3E%3Cpath d='M9 12l2 2 4-4'/%3E%3C/svg%3E")}
.ico-server{--i:url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' viewBox='0 0 24 24' fill='none' stroke='black' stroke-width='2'%3E%3Crect x='3' y='4' width='18' height='7' rx='2'/%3E%3Crect x='3' y='13' width='18' height='7' rx='2'/%3E%3Cpath d='M7 7.5h.01M7 16.5h.01'/%3E%3C/svg%3E")}
.ico-coin{--i:url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' viewBox='0 0 24 24' fill='none' stroke='black' stroke-width='2'%3E%3Ccircle cx='12' cy='12' r='9'/%3E%3Cpath d='M12 7v10M9.5 9.5h4a1.5 1.5 0 010 3h-3a1.5 1.5 0 000 3h4'/%3E%3C/svg%3E")}
.ico-spark{--i:url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' viewBox='0 0 24 24' fill='none' stroke='black' stroke-width='2'%3E%3Cpath d='M12 3l2 6 6 2-6 2-2 6-2-6-6-2 6-2z'/%3E%3C/svg%3E")}
.ico-plug{--i:url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' viewBox='0 0 24 24' fill='none' stroke='black' stroke-width='2'%3E%3Cpath d='M9 2v6M15 2v6M7 8h10v3a5 5 0 01-10 0z'/%3E%3Cpath d='M12 16v6'/%3E%3C/svg%3E")}
.ico-code{--i:url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' viewBox='0 0 24 24' fill='none' stroke='black' stroke-width='2'%3E%3Cpath d='M8 8l-4 4 4 4M16 8l4 4-4 4M13 5l-2 14'/%3E%3C/svg%3E")}
.feature-card h3{font-size:1.2rem;font-weight:700;margin-bottom:.55rem}
.feature-card p{color:var(--txt-2);font-size:.95rem}
.feature-card b{color:var(--orange-2);font-weight:700}

/* ============ PRICING ============ */
.price-grid{display:grid;grid-template-columns:repeat(5,1fr);gap:1rem}
.price-card{background:linear-gradient(180deg,var(--panel),var(--panel-2));border:1px solid var(--line);
  border-radius:var(--radius);padding:1.8rem 1.3rem;text-align:center;transition:transform .3s,box-shadow .3s;box-shadow:var(--shadow-sm)}
.price-card:hover{transform:translateY(-6px);box-shadow:var(--shadow)}
.price-card>*{position:relative;z-index:3}
.price-card__bar{position:absolute;inset:0 0 auto 0;height:4px;background:var(--grad);z-index:3}
.price-card__logo{width:56px;height:56px;margin:0 auto 1rem;border-radius:16px;display:grid;place-items:center;
  font-weight:800;font-size:1.4rem;color:#fff;box-shadow:var(--shadow-sm)}
.price-card__name{font-weight:700;font-size:1rem}
.price-card__sub{font-size:.78rem;color:var(--txt-3);margin-bottom:1rem}
.price-card__x{font-size:2.5rem;font-weight:900;line-height:1;background:var(--grad);-webkit-background-clip:text;background-clip:text;color:transparent}
.price-card__x small{font-size:.9rem;color:var(--txt-3);font-weight:600;-webkit-text-fill-color:var(--txt-3)}
.price-card__desc{font-size:.8rem;color:var(--txt-2);margin-top:.5rem}
.price-note{display:flex;flex-wrap:wrap;justify-content:center;gap:1.6rem;margin-top:2.4rem;position:relative}
.price-note__item{display:flex;align-items:center;gap:.5rem;color:var(--txt-2);font-size:.9rem}
.tick{width:18px;height:18px;border-radius:50%;background:var(--grad);display:inline-grid;place-items:center;flex:none}
.tick::after{content:"";width:9px;height:9px;background:#fff;-webkit-mask:url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' viewBox='0 0 24 24' fill='none' stroke='black' stroke-width='3'%3E%3Cpath d='M5 12l5 5L20 6'/%3E%3C/svg%3E") center/contain no-repeat;mask:url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' viewBox='0 0 24 24' fill='none' stroke='black' stroke-width='3'%3E%3Cpath d='M5 12l5 5L20 6'/%3E%3C/svg%3E") center/contain no-repeat}
.price-note__item b{color:var(--orange-2)}

/* ============ MODELS ============ */
.models{display:grid;grid-template-columns:repeat(3,1fr);gap:1.2rem}
.model-card{background:linear-gradient(180deg,var(--panel),var(--panel-2));border:1px solid var(--line);
  border-radius:var(--radius);padding:1.6rem;transition:transform .3s,box-shadow .3s;box-shadow:var(--shadow-sm)}
.model-card:hover{transform:translateY(-5px);box-shadow:var(--shadow)}
.model-card>*{position:relative;z-index:3}
.model-card__top{display:flex;align-items:center;gap:.8rem;margin-bottom:1rem}
.model-card__logo{width:44px;height:44px;border-radius:12px;display:grid;place-items:center;font-weight:800;color:#fff;flex:none;box-shadow:var(--shadow-sm)}
.model-card__name{font-weight:700;font-size:1.05rem}
.model-card__vendor{font-size:.78rem;color:var(--txt-3);font-family:var(--mono)}
.model-card__tags{display:flex;flex-wrap:wrap;gap:.4rem;margin-top:.4rem}
.model-card__tags span{font-size:.72rem;padding:.2rem .55rem;border:1px solid var(--line-2);border-radius:100px;color:var(--txt-2)}
.model-card__src{margin-top:1rem;font-size:.82rem;color:var(--txt-2);display:flex;align-items:center;gap:.4rem}
.model-card__src .d{width:7px;height:7px;border-radius:50%;background:#20b880}

/* ============ TOOLS ============ */
.tools{display:grid;grid-template-columns:repeat(6,1fr);gap:1rem}
.tool-card{background:var(--panel);border:1px solid var(--line);border-radius:16px;padding:1.5rem 1rem;
  display:flex;flex-direction:column;align-items:center;gap:.7rem;text-align:center;transition:transform .3s,box-shadow .3s;box-shadow:var(--shadow-sm)}
.tool-card:hover{transform:translateY(-5px);box-shadow:var(--shadow)}
.tool-card>*{position:relative;z-index:3}
.tool-card__ico{width:52px;height:52px;border-radius:14px;display:grid;place-items:center;background:var(--bg-2);border:1px solid var(--line)}
.tool-card__ico svg{width:30px;height:30px}
.tool-card__name{font-weight:600;font-size:.9rem}
.tool-card__sub{font-size:.72rem;color:var(--txt-3)}
.tools__more{text-align:center;margin-top:1.6rem;color:var(--txt-3);font-size:.9rem;position:relative}

/* ============ FORMATS ============ */
.formats{display:grid;grid-template-columns:repeat(3,1fr);gap:1.2rem}
.format-card{background:var(--panel);border:1px solid var(--line);border-radius:var(--radius);padding:1.6rem;transition:transform .3s,box-shadow .3s;box-shadow:var(--shadow-sm)}
.format-card--hot{box-shadow:0 0 0 1.5px rgba(37,99,235,.45),var(--shadow-sm)}
.format-card:hover{transform:translateY(-4px);box-shadow:var(--shadow)}
.format-card>*{position:relative;z-index:3}
.format-card__tag{display:inline-block;font-size:.72rem;font-weight:700;letter-spacing:.05em;color:var(--blue-3);
  padding:.2rem .6rem;border:1px solid var(--line-2);border-radius:100px;margin-bottom:.7rem}
.format-card h3{font-size:1.15rem;margin-bottom:1rem}
.format-card h3 em{font-style:normal;font-size:.8rem;color:var(--txt-3);font-weight:400}
.format-card pre{background:#f2f4fa;border:1px solid var(--line);border-radius:12px;padding:1rem;overflow-x:auto}
.format-card code{font-family:var(--mono);font-size:.78rem;line-height:1.7;color:var(--txt-2);white-space:pre}
.c-k{color:var(--orange-2);font-weight:700}.c-p{color:var(--blue-3)}.c-a{color:#8b5cf6}.c-s{color:#0f9d63}.c-n{color:#d98014}

/* ============ CTA ============ */
.cta{padding:110px 0}
.cta__inner{position:relative;text-align:center;overflow:hidden;border-radius:32px;padding:4rem 2rem;
  border:1px solid var(--line-2);
  background:linear-gradient(rgba(255,255,255,.55),rgba(255,255,255,.7)),url('img/bg-cta.png') center/cover;
  box-shadow:var(--shadow)}
.cta__glow{position:absolute;inset:0;background:radial-gradient(520px 300px at 50% 0%,rgba(14,165,233,.22),transparent 62%);pointer-events:none}
.cta h2{font-size:clamp(1.9rem,4vw,3rem);font-weight:900;position:relative}
.cta p{color:var(--txt-2);margin:1rem 0 2rem;font-size:1.1rem;position:relative}
.cta__actions{display:flex;gap:1rem;justify-content:center;flex-wrap:wrap;position:relative}

/* ============ FOOTER ============ */
.footer{border-top:1px solid var(--line);background:#eef1f8;padding:3.5rem 0 1.5rem}
.footer__inner{display:grid;grid-template-columns:1.4fr 2fr;gap:3rem}
.footer__brand p{color:var(--txt-3);font-size:.9rem;margin-top:1rem;max-width:26rem}
.footer__endpoint code{font-family:var(--mono);color:var(--orange-2);font-size:.82rem}
.footer__cols{display:grid;grid-template-columns:repeat(3,1fr);gap:1.5rem}
.footer__cols h4{font-size:.85rem;letter-spacing:.1em;text-transform:uppercase;color:var(--txt-3);margin-bottom:.9rem}
.footer__cols a{display:block;color:var(--txt-2);font-size:.9rem;padding:.28rem 0;transition:.2s}
.footer__cols a:hover{color:var(--orange-2)}
.footer__bottom{display:flex;justify-content:space-between;gap:1rem;flex-wrap:wrap;margin-top:2.6rem;padding-top:1.6rem;
  border-top:1px solid var(--line);color:var(--txt-3);font-size:.82rem}

/* ============ REVEAL ANIM ============ */
[data-reveal]{opacity:0;transform:translateY(28px);transition:.7s cubic-bezier(.2,.7,.2,1)}
[data-reveal].in{opacity:1;transform:none}

/* ============ RESPONSIVE ============ */
@media(max-width:1000px){
  .hero__inner{grid-template-columns:1fr;gap:2.5rem}
  .reveal{max-width:420px;margin-inline:auto}
  .features,.models{grid-template-columns:repeat(2,1fr)}
  .price-grid{grid-template-columns:repeat(3,1fr)}
  .tools{grid-template-columns:repeat(3,1fr)}
  .formats{grid-template-columns:1fr}
  .footer__inner{grid-template-columns:1fr}
  /* disable fixed backgrounds on mobile for perf */
  #features,#pricing,#models,#tools,#formats{background-attachment:scroll}
}
@media(max-width:640px){
  .nav__links,.nav__cta{display:none}
  .nav__burger{display:flex}
  .nav.open .nav__links{display:flex;position:absolute;top:72px;left:0;right:0;flex-direction:column;
    background:rgba(255,255,255,.97);padding:1.2rem 6vw;gap:1rem;border-bottom:1px solid var(--line);box-shadow:var(--shadow-sm)}
  .hero__stats{grid-template-columns:repeat(2,1fr);gap:1.4rem}
  .features,.models,.price-grid,.tools{grid-template-columns:repeat(2,1fr)}
  .strip__inner{gap:1.2rem}
  .price-card__x{font-size:2rem}
}
@media(max-width:420px){
  .price-grid,.tools{grid-template-columns:1fr}
}