/* ZEROTECH landing — nguồn thiết kế: landing-design/Main.dc.html (desktop) + Mobile.dc.html (≤640px) */
/* Font tự host (@fontsource, subset latin + latin-ext + vietnamese) */
@font-face{font-family:"Chakra Petch";font-style:normal;font-weight:500;font-display:swap;src:url(/assets/fonts/chakra-petch-vietnamese-500-normal.woff2?v=1) format("woff2");unicode-range:U+0102-0103,U+0110-0111,U+0128-0129,U+0168-0169,U+01A0-01A1,U+01AF-01B0,U+0300-0301,U+0303-0304,U+0308-0309,U+0323,U+0329,U+1EA0-1EF9,U+20AB}
@font-face{font-family:"Chakra Petch";font-style:normal;font-weight:500;font-display:swap;src:url(/assets/fonts/chakra-petch-latin-ext-500-normal.woff2?v=1) format("woff2");unicode-range:U+0100-02BA,U+02BD-02C5,U+02C7-02CC,U+02CE-02D7,U+02DD-02FF,U+0304,U+0308,U+0329,U+1D00-1DBF,U+1E00-1E9F,U+1EF2-1EFF,U+2020,U+20A0-20AB,U+20AD-20C0,U+2113,U+2C60-2C7F,U+A720-A7FF}
@font-face{font-family:"Chakra Petch";font-style:normal;font-weight:500;font-display:swap;src:url(/assets/fonts/chakra-petch-latin-500-normal.woff2?v=1) format("woff2");unicode-range:U+0000-00FF,U+0131,U+0152-0153,U+02BB-02BC,U+02C6,U+02DA,U+02DC,U+0304,U+0308,U+0329,U+2000-206F,U+20AC,U+2122,U+2191,U+2193,U+2212,U+2215,U+FEFF,U+FFFD}
@font-face{font-family:"Chakra Petch";font-style:normal;font-weight:600;font-display:swap;src:url(/assets/fonts/chakra-petch-vietnamese-600-normal.woff2?v=1) format("woff2");unicode-range:U+0102-0103,U+0110-0111,U+0128-0129,U+0168-0169,U+01A0-01A1,U+01AF-01B0,U+0300-0301,U+0303-0304,U+0308-0309,U+0323,U+0329,U+1EA0-1EF9,U+20AB}
@font-face{font-family:"Chakra Petch";font-style:normal;font-weight:600;font-display:swap;src:url(/assets/fonts/chakra-petch-latin-ext-600-normal.woff2?v=1) format("woff2");unicode-range:U+0100-02BA,U+02BD-02C5,U+02C7-02CC,U+02CE-02D7,U+02DD-02FF,U+0304,U+0308,U+0329,U+1D00-1DBF,U+1E00-1E9F,U+1EF2-1EFF,U+2020,U+20A0-20AB,U+20AD-20C0,U+2113,U+2C60-2C7F,U+A720-A7FF}
@font-face{font-family:"Chakra Petch";font-style:normal;font-weight:600;font-display:swap;src:url(/assets/fonts/chakra-petch-latin-600-normal.woff2?v=1) format("woff2");unicode-range:U+0000-00FF,U+0131,U+0152-0153,U+02BB-02BC,U+02C6,U+02DA,U+02DC,U+0304,U+0308,U+0329,U+2000-206F,U+20AC,U+2122,U+2191,U+2193,U+2212,U+2215,U+FEFF,U+FFFD}
@font-face{font-family:"Chakra Petch";font-style:normal;font-weight:700;font-display:swap;src:url(/assets/fonts/chakra-petch-vietnamese-700-normal.woff2?v=1) format("woff2");unicode-range:U+0102-0103,U+0110-0111,U+0128-0129,U+0168-0169,U+01A0-01A1,U+01AF-01B0,U+0300-0301,U+0303-0304,U+0308-0309,U+0323,U+0329,U+1EA0-1EF9,U+20AB}
@font-face{font-family:"Chakra Petch";font-style:normal;font-weight:700;font-display:swap;src:url(/assets/fonts/chakra-petch-latin-ext-700-normal.woff2?v=1) format("woff2");unicode-range:U+0100-02BA,U+02BD-02C5,U+02C7-02CC,U+02CE-02D7,U+02DD-02FF,U+0304,U+0308,U+0329,U+1D00-1DBF,U+1E00-1E9F,U+1EF2-1EFF,U+2020,U+20A0-20AB,U+20AD-20C0,U+2113,U+2C60-2C7F,U+A720-A7FF}
@font-face{font-family:"Chakra Petch";font-style:normal;font-weight:700;font-display:swap;src:url(/assets/fonts/chakra-petch-latin-700-normal.woff2?v=1) format("woff2");unicode-range:U+0000-00FF,U+0131,U+0152-0153,U+02BB-02BC,U+02C6,U+02DA,U+02DC,U+0304,U+0308,U+0329,U+2000-206F,U+20AC,U+2122,U+2191,U+2193,U+2212,U+2215,U+FEFF,U+FFFD}
@font-face{font-family:"Be Vietnam Pro";font-style:normal;font-weight:400;font-display:swap;src:url(/assets/fonts/be-vietnam-pro-vietnamese-400-normal.woff2?v=1) format("woff2");unicode-range:U+0102-0103,U+0110-0111,U+0128-0129,U+0168-0169,U+01A0-01A1,U+01AF-01B0,U+0300-0301,U+0303-0304,U+0308-0309,U+0323,U+0329,U+1EA0-1EF9,U+20AB}
@font-face{font-family:"Be Vietnam Pro";font-style:normal;font-weight:400;font-display:swap;src:url(/assets/fonts/be-vietnam-pro-latin-ext-400-normal.woff2?v=1) format("woff2");unicode-range:U+0100-02BA,U+02BD-02C5,U+02C7-02CC,U+02CE-02D7,U+02DD-02FF,U+0304,U+0308,U+0329,U+1D00-1DBF,U+1E00-1E9F,U+1EF2-1EFF,U+2020,U+20A0-20AB,U+20AD-20C0,U+2113,U+2C60-2C7F,U+A720-A7FF}
@font-face{font-family:"Be Vietnam Pro";font-style:normal;font-weight:400;font-display:swap;src:url(/assets/fonts/be-vietnam-pro-latin-400-normal.woff2?v=1) format("woff2");unicode-range:U+0000-00FF,U+0131,U+0152-0153,U+02BB-02BC,U+02C6,U+02DA,U+02DC,U+0304,U+0308,U+0329,U+2000-206F,U+20AC,U+2122,U+2191,U+2193,U+2212,U+2215,U+FEFF,U+FFFD}
@font-face{font-family:"Be Vietnam Pro";font-style:normal;font-weight:500;font-display:swap;src:url(/assets/fonts/be-vietnam-pro-vietnamese-500-normal.woff2?v=1) format("woff2");unicode-range:U+0102-0103,U+0110-0111,U+0128-0129,U+0168-0169,U+01A0-01A1,U+01AF-01B0,U+0300-0301,U+0303-0304,U+0308-0309,U+0323,U+0329,U+1EA0-1EF9,U+20AB}
@font-face{font-family:"Be Vietnam Pro";font-style:normal;font-weight:500;font-display:swap;src:url(/assets/fonts/be-vietnam-pro-latin-ext-500-normal.woff2?v=1) format("woff2");unicode-range:U+0100-02BA,U+02BD-02C5,U+02C7-02CC,U+02CE-02D7,U+02DD-02FF,U+0304,U+0308,U+0329,U+1D00-1DBF,U+1E00-1E9F,U+1EF2-1EFF,U+2020,U+20A0-20AB,U+20AD-20C0,U+2113,U+2C60-2C7F,U+A720-A7FF}
@font-face{font-family:"Be Vietnam Pro";font-style:normal;font-weight:500;font-display:swap;src:url(/assets/fonts/be-vietnam-pro-latin-500-normal.woff2?v=1) format("woff2");unicode-range:U+0000-00FF,U+0131,U+0152-0153,U+02BB-02BC,U+02C6,U+02DA,U+02DC,U+0304,U+0308,U+0329,U+2000-206F,U+20AC,U+2122,U+2191,U+2193,U+2212,U+2215,U+FEFF,U+FFFD}
@font-face{font-family:"Be Vietnam Pro";font-style:normal;font-weight:600;font-display:swap;src:url(/assets/fonts/be-vietnam-pro-vietnamese-600-normal.woff2?v=1) format("woff2");unicode-range:U+0102-0103,U+0110-0111,U+0128-0129,U+0168-0169,U+01A0-01A1,U+01AF-01B0,U+0300-0301,U+0303-0304,U+0308-0309,U+0323,U+0329,U+1EA0-1EF9,U+20AB}
@font-face{font-family:"Be Vietnam Pro";font-style:normal;font-weight:600;font-display:swap;src:url(/assets/fonts/be-vietnam-pro-latin-ext-600-normal.woff2?v=1) format("woff2");unicode-range:U+0100-02BA,U+02BD-02C5,U+02C7-02CC,U+02CE-02D7,U+02DD-02FF,U+0304,U+0308,U+0329,U+1D00-1DBF,U+1E00-1E9F,U+1EF2-1EFF,U+2020,U+20A0-20AB,U+20AD-20C0,U+2113,U+2C60-2C7F,U+A720-A7FF}
@font-face{font-family:"Be Vietnam Pro";font-style:normal;font-weight:600;font-display:swap;src:url(/assets/fonts/be-vietnam-pro-latin-600-normal.woff2?v=1) format("woff2");unicode-range:U+0000-00FF,U+0131,U+0152-0153,U+02BB-02BC,U+02C6,U+02DA,U+02DC,U+0304,U+0308,U+0329,U+2000-206F,U+20AC,U+2122,U+2191,U+2193,U+2212,U+2215,U+FEFF,U+FFFD}
@font-face{font-family:"JetBrains Mono";font-style:normal;font-weight:400;font-display:swap;src:url(/assets/fonts/jetbrains-mono-vietnamese-400-normal.woff2?v=1) format("woff2");unicode-range:U+0102-0103,U+0110-0111,U+0128-0129,U+0168-0169,U+01A0-01A1,U+01AF-01B0,U+0300-0301,U+0303-0304,U+0308-0309,U+0323,U+0329,U+1EA0-1EF9,U+20AB}
@font-face{font-family:"JetBrains Mono";font-style:normal;font-weight:400;font-display:swap;src:url(/assets/fonts/jetbrains-mono-latin-ext-400-normal.woff2?v=1) format("woff2");unicode-range:U+0100-02BA,U+02BD-02C5,U+02C7-02CC,U+02CE-02D7,U+02DD-02FF,U+0304,U+0308,U+0329,U+1D00-1DBF,U+1E00-1E9F,U+1EF2-1EFF,U+2020,U+20A0-20AB,U+20AD-20C0,U+2113,U+2C60-2C7F,U+A720-A7FF}
@font-face{font-family:"JetBrains Mono";font-style:normal;font-weight:400;font-display:swap;src:url(/assets/fonts/jetbrains-mono-latin-400-normal.woff2?v=1) format("woff2");unicode-range:U+0000-00FF,U+0131,U+0152-0153,U+02BB-02BC,U+02C6,U+02DA,U+02DC,U+0304,U+0308,U+0329,U+2000-206F,U+20AC,U+2122,U+2191,U+2193,U+2212,U+2215,U+FEFF,U+FFFD}
@font-face{font-family:"JetBrains Mono";font-style:normal;font-weight:500;font-display:swap;src:url(/assets/fonts/jetbrains-mono-vietnamese-500-normal.woff2?v=1) format("woff2");unicode-range:U+0102-0103,U+0110-0111,U+0128-0129,U+0168-0169,U+01A0-01A1,U+01AF-01B0,U+0300-0301,U+0303-0304,U+0308-0309,U+0323,U+0329,U+1EA0-1EF9,U+20AB}
@font-face{font-family:"JetBrains Mono";font-style:normal;font-weight:500;font-display:swap;src:url(/assets/fonts/jetbrains-mono-latin-ext-500-normal.woff2?v=1) format("woff2");unicode-range:U+0100-02BA,U+02BD-02C5,U+02C7-02CC,U+02CE-02D7,U+02DD-02FF,U+0304,U+0308,U+0329,U+1D00-1DBF,U+1E00-1E9F,U+1EF2-1EFF,U+2020,U+20A0-20AB,U+20AD-20C0,U+2113,U+2C60-2C7F,U+A720-A7FF}
@font-face{font-family:"JetBrains Mono";font-style:normal;font-weight:500;font-display:swap;src:url(/assets/fonts/jetbrains-mono-latin-500-normal.woff2?v=1) format("woff2");unicode-range:U+0000-00FF,U+0131,U+0152-0153,U+02BB-02BC,U+02C6,U+02DA,U+02DC,U+0304,U+0308,U+0329,U+2000-206F,U+20AC,U+2122,U+2191,U+2193,U+2212,U+2215,U+FEFF,U+FFFD}

/* ───────── Tokens (landing-page-build.md §4) ───────── */
:root{
  /* Night Court — dark-only, có chủ đích */
  --ink:#06090F;      /* nền trang */
  --ink-2:#080C14;    /* nền section xen kẽ: Công nghệ, Sản phẩm */
  --panel:#0C121C;    /* thẻ, khung */
  --screen:#0A0F18;   /* nền khung minh hoạ */
  --line:#1B2636;     /* viền, kẻ */
  --line-2:#2A3850;   /* viền nút phụ, CTA box */
  --fg:#E4EBF3;       /* chữ chính */
  --fg-2:#A3B0C2;     /* lead, chip */
  --muted:#8392A6;    /* chữ phụ */
  --dim:#5B6B80;      /* nhãn mono, timestamp */
  --lime:#D4FF3A;     /* màu "bóng" — nhấn, CTA, dữ liệu */
  --cyan:#3BE0FF;     /* màu "máy" — khung AI, eyebrow */
  --red:#FF5A4E;      /* chấm LIVE */
  --red-text:#FF7A70; /* chữ lỗi trên nền tối */
  --f-display:"Chakra Petch", "Be Vietnam Pro", system-ui, sans-serif;
  --f-body:"Be Vietnam Pro", system-ui, -apple-system, "Segoe UI", sans-serif;
  --f-mono:"JetBrains Mono", ui-monospace, "SF Mono", Menlo, monospace;
  color-scheme: dark;

  --gutter:clamp(16px,5vw,80px);
  --hdr-h:76px;
}

/* ───────── Base ───────── */
*,*::before,*::after{box-sizing:border-box}
html{-webkit-text-size-adjust:100%;text-size-adjust:100%;scroll-padding-top:var(--hdr-h);background:var(--ink)}
body{margin:0;background:var(--ink);color:var(--fg);font-family:var(--f-body);font-size:16px;line-height:1.65;overflow-x:clip;-webkit-font-smoothing:antialiased}
a{color:var(--fg);text-decoration:none}
:where(a:hover){color:var(--lime)}
img,svg{max-width:100%}
h1,h2,h3,p,ol,address{margin:0}
address{font-style:normal}
button{font:inherit;color:inherit}
:focus-visible{outline:2px solid var(--lime);outline-offset:3px}
[hidden]{display:none!important}
.i18n-wait body{visibility:hidden}
.hl,.c-lime{color:var(--lime)}
.c-fg{color:var(--fg)}
.c-err{color:var(--red-text)}

.skip{position:absolute;left:16px;top:-100px;z-index:100;background:var(--lime);color:var(--ink);font-family:var(--f-display);font-weight:600;padding:0 16px;min-height:44px;display:inline-flex;align-items:center;border-radius:4px}
.skip:focus{top:16px;color:var(--ink)}

.wrap{max-width:1280px;margin:0 auto}
.sq{display:inline-block;background:var(--lime);flex:none}
.sq--8{width:8px;height:8px}
.sq--6{width:6px;height:6px}
.dot{display:inline-block;border-radius:50%;background:var(--red);flex:none}
.dot--7{width:7px;height:7px}
.dot--6{width:6px;height:6px}
.live{display:flex;align-items:center;gap:7px}

/* ───────── Buttons ───────── */
.btn{display:inline-flex;align-items:center;justify-content:center;gap:10px;border-radius:4px;font-family:var(--f-display);font-weight:600;letter-spacing:.06em;line-height:1.2;text-align:center}
.btn--pri{background:var(--lime);color:var(--ink)}
.btn--pri:hover{color:var(--ink);background:#E0FF6E}
.btn--sec{border:1px solid var(--line-2);color:var(--fg)}
.btn--sec:hover{border-color:var(--fg-2);color:var(--fg)}
.btn--sm{font-size:14px;padding:0 18px;min-height:44px}
.btn--lg{font-size:15px;padding:0 24px;min-height:52px}
.btn--xl{font-size:15px;padding:0 26px;min-height:54px}
.btn--block{display:flex;width:100%;min-height:52px;font-size:15px}
.btn,.card,.prod{transition:background-color .2s,border-color .2s,color .2s,translate .2s}

/* ───────── 1 · Header ───────── */
.hdr{position:sticky;top:0;z-index:50;background:var(--ink);border-bottom:1px solid var(--line);padding:0 var(--gutter);transition:background-color .2s}
.hdr.is-scrolled{background:rgba(6,9,15,.82);-webkit-backdrop-filter:blur(12px) saturate(140%);backdrop-filter:blur(12px) saturate(140%)}
.hdr__in{max-width:1280px;margin:0 auto;display:flex;align-items:center;justify-content:space-between;gap:16px 32px;min-height:var(--hdr-h)}
.brand{display:flex;align-items:center;gap:12px;min-height:44px;flex:none}
.brand__word{font-family:var(--f-display);font-weight:600;font-size:19px;letter-spacing:.2em;color:var(--fg)}
.nav{display:flex;align-items:center;gap:0 clamp(16px,2vw,28px);font-size:15px}
.nav a{min-height:44px;display:inline-flex;align-items:center;white-space:nowrap}
.hdr__act{display:flex;align-items:center;gap:12px;flex:none}
.hdr__cta{white-space:nowrap}
.lang{display:flex;border:1px solid var(--line);border-radius:4px;overflow:hidden;font-family:var(--f-mono);font-size:12px;letter-spacing:.08em}
.lang a{display:inline-flex;align-items:center;justify-content:center;min-width:44px;min-height:44px;padding:0 12px;color:var(--muted)}
.lang a:hover{color:var(--fg)}
.lang a[aria-current="true"]{background:var(--fg);color:var(--ink)}
.burger{display:none;background:transparent;border:1px solid var(--line);border-radius:4px;width:44px;height:44px;place-items:center;cursor:pointer;padding:0}
.burger:hover{border-color:var(--line-2)}

/* Drawer (menu mobile) */
.drawer{position:fixed;inset:0;z-index:60;background:var(--ink);display:flex;flex-direction:column;padding:0 16px 24px;overflow-y:auto;overscroll-behavior:contain}
.drawer__bar{display:flex;align-items:center;justify-content:space-between;min-height:64px;border-bottom:1px solid var(--line);margin:0 -16px;padding:0 16px}
.drawer__bar .brand{gap:10px}
.drawer__bar .brand__word{font-size:17px}
.drawer .burger{display:grid}
.drawer__nav{display:flex;flex-direction:column;margin-top:16px}
.drawer__nav a{display:flex;align-items:baseline;gap:16px;min-height:64px;padding:14px 0;border-bottom:1px solid var(--line);font-family:var(--f-display);font-weight:600;font-size:28px;line-height:1.2}
.drawer__n{font-family:var(--f-mono);font-weight:400;font-size:12px;color:var(--dim);letter-spacing:.08em}
.drawer__foot{margin-top:auto;padding-top:32px;display:flex;flex-direction:column;gap:16px;align-items:stretch}
.drawer__foot .lang{align-self:flex-start}
html.is-locked,html.is-locked body{overflow:hidden}
@media (prefers-reduced-motion:no-preference){
  .drawer:not([hidden]){animation:zt-drawer .24s cubic-bezier(.2,.7,.2,1)}
}
@keyframes zt-drawer{from{opacity:0;transform:translateY(-8px)}to{opacity:1;transform:none}}

/* ───────── 2 · Hero ───────── */
.hero{padding:clamp(48px,7vw,96px) var(--gutter) clamp(56px,7vw,104px);position:relative}
.hero__in{display:flex;flex-wrap:wrap;align-items:center;gap:48px 64px}
.hero__copy{flex:1 1 520px;min-width:0}
.hero__eye{font-family:var(--f-mono);font-size:12px;letter-spacing:.14em;color:var(--muted);display:flex;align-items:center;gap:10px}
.hero__h1{font-family:var(--f-display);font-weight:700;font-size:clamp(40px,5.6vw,80px);line-height:1.04;letter-spacing:-.01em;margin:22px 0 0;text-wrap:balance}
.hero__lead{margin:26px 0 0;max-width:56ch;font-size:clamp(16px,1.3vw,19px);color:var(--fg-2)}
.hero__cta{display:flex;flex-wrap:wrap;gap:12px;margin-top:34px}
.hero__areas{margin-top:48px;display:grid;grid-template-columns:repeat(auto-fit,minmax(220px,1fr));gap:1px;background:var(--line);border:1px solid var(--line);border-radius:6px;overflow:hidden}
.hero__area{background:var(--ink);padding:14px 16px}
.hero__area-t{font-family:var(--f-display);font-weight:600;font-size:16px;display:flex;align-items:center;gap:8px}
.hero__area-d{font-size:13.5px;color:var(--muted);line-height:1.5;margin-top:4px}
.hero__viz{flex:1 1 460px;min-width:0;max-width:640px}
.hero__viz-m{display:none;margin-top:28px;border:1px solid var(--line);border-radius:8px;background:var(--screen);overflow:hidden}
.screen{position:relative;border:1px solid var(--line);border-radius:8px;background:var(--screen);overflow:hidden}
.screen__hud{position:absolute;left:14px;right:14px;top:12px;display:flex;justify-content:space-between;gap:12px;font-family:var(--f-mono);font-size:11px;letter-spacing:.1em;color:var(--muted);z-index:1}
.zt-svg{display:block;width:100%;height:auto}

/* ───────── Section chung ───────── */
.sec{padding:clamp(64px,8vw,120px) var(--gutter);border-top:1px solid var(--line)}
.sec--alt{background:var(--ink-2)}
.sec__head{display:flex;flex-wrap:wrap;justify-content:space-between;align-items:flex-end;gap:16px 48px}
.sec__title{min-width:0;flex:1 1 520px}
.sec__intro{max-width:44ch;color:var(--muted);flex:0 1 440px}
.eyebrow{font-family:var(--f-mono);font-size:12px;letter-spacing:.14em;color:var(--cyan)}
.h2{font-family:var(--f-display);font-weight:600;font-size:clamp(30px,3.6vw,52px);line-height:1.1;margin:14px 0 0;text-wrap:balance}
.chips{display:flex;flex-wrap:wrap;gap:6px;font-family:var(--f-mono);font-size:11px;letter-spacing:.04em;color:var(--fg-2);line-height:1.65}
.chips span{border:1px solid var(--line);border-radius:3px;padding:4px 8px}

/* ───────── 3 · Lĩnh vực ───────── */
.cards{margin-top:56px;display:grid;grid-template-columns:repeat(auto-fit,minmax(270px,1fr));gap:16px}
.card{background:var(--panel);border:1px solid var(--line);border-radius:8px;padding:28px 26px 30px;display:flex;flex-direction:column;gap:16px;min-width:0}
.card:hover,.prod:hover{border-color:var(--line-2);translate:0 -2px}
.card__head{display:flex;justify-content:space-between;align-items:flex-start}
.card__ico{flex:none}
.card__tag{font-family:var(--f-mono);font-size:11px;color:var(--dim);letter-spacing:.1em}
.card__h{font-family:var(--f-display);font-weight:600;font-size:23px;line-height:1.2}
.card__p{color:var(--muted);font-size:15px}
.card .chips{margin-top:auto;padding-top:8px}

/* ───────── 4 · Công nghệ ───────── */
.tech{display:flex;flex-wrap:wrap;gap:48px 64px;align-items:flex-start}
.tech__copy{flex:1 1 380px;min-width:0}
.tech__intro{margin:20px 0 0;max-width:48ch;color:var(--muted)}
.tech__viz{flex:1.4 1 520px;min-width:0}
.tech__viz-m{display:none}
.techlist{margin-top:36px;display:flex;flex-direction:column}
.techlist__row{display:grid;grid-template-columns:44px minmax(0,1fr);gap:4px 14px;padding:18px 0;border-top:1px solid var(--line)}
.techlist__row:last-child{border-bottom:1px solid var(--line)}
.techlist__k{font-family:var(--f-mono);font-size:12px;color:var(--lime);padding-top:4px}
.techlist__h{font-family:var(--f-display);font-weight:600;font-size:18px}
.techlist__d{color:var(--muted);font-size:15px}
.panel{border:1px solid var(--line);border-radius:8px;background:var(--panel);overflow:hidden}
.panel__hud{display:flex;justify-content:space-between;gap:12px;padding:12px 16px;border-bottom:1px solid var(--line);font-family:var(--f-mono);font-size:11px;letter-spacing:.1em;color:var(--muted);flex-wrap:wrap}
.log{display:grid;grid-template-columns:repeat(2,minmax(0,1fr));border-top:1px solid var(--line);font-family:var(--f-mono);font-size:12px;letter-spacing:.04em}
.log>div{padding:12px 16px;display:flex;gap:12px}
.log:not(.log--m)>div:nth-child(odd){border-right:1px solid var(--line)}
.log:not(.log--m)>div:nth-child(n+3){border-top:1px solid var(--line)}
.log__t{color:var(--dim)}
.tech__video{display:block;width:100%;height:auto;aspect-ratio:1280/808;background:#0A1019;object-fit:cover}
/* .panel có overflow:hidden → vẽ viền focus vào trong */
.tech__video:focus,.tech__video:focus-within{outline:2px solid var(--lime);outline-offset:-2px}

/* ───────── 5 · Tầm nhìn ───────── */
.sec--vision{padding:clamp(72px,9vw,136px) var(--gutter)}
.vision__h2{font-family:var(--f-display);font-weight:700;font-size:clamp(38px,6vw,92px);line-height:1;margin:18px 0 0;letter-spacing:-.015em;text-wrap:balance}
.vision__lead{margin:28px 0 0;max-width:60ch;color:var(--muted);font-size:clamp(16px,1.3vw,19px)}
.steps{margin-top:64px;position:relative}
.steps__track,.steps__fill{position:absolute;left:0;right:0;top:7px;height:2px;background:var(--line)}
.steps__fill{background:var(--lime);transform-origin:left center}
.steps__list{list-style:none;padding:0;display:grid;grid-template-columns:repeat(auto-fit,minmax(220px,1fr));gap:32px;position:relative}
.step{min-width:0}
.step__dot{display:block;width:16px;height:16px;border-radius:50%;background:var(--ink);border:2px solid var(--lime)}
.step__dot--on{background:var(--lime)}
.step__n{font-family:var(--f-mono);font-size:12px;color:var(--dim);margin-top:22px}
.step__h{font-family:var(--f-display);font-weight:600;font-size:24px;margin-top:4px}
.step__p{margin:8px 0 0;color:var(--muted);font-size:15px}

/* ───────── 6 · Sản phẩm ───────── */
.prods{margin-top:56px;display:grid;grid-template-columns:repeat(auto-fit,minmax(300px,1fr));gap:16px}
.prod{background:var(--panel);border:1px solid var(--line);border-radius:8px;overflow:hidden;display:flex;flex-direction:column;min-width:0}
.prod__shot,.prod__img{display:block;width:100%;aspect-ratio:16/10;max-width:100%;background:#0A1019;border-bottom:1px solid var(--line);object-fit:cover;object-position:top center;height:auto}
.prod__shot{display:grid;place-items:center;font-family:var(--f-mono);font-size:12px;color:var(--dim);letter-spacing:.08em;text-align:center;padding:0 16px}
.prod__body{padding:24px 24px 26px;display:flex;flex-direction:column;gap:12px;flex:1}
.prod__top{display:flex;justify-content:space-between;align-items:baseline;gap:12px}
.prod__h{font-family:var(--f-display);font-weight:600;font-size:24px;line-height:1.3}
.prod__dom{font-family:var(--f-mono);font-size:12px;color:var(--muted)}
.prod__p{color:var(--muted);font-size:15px}
.prod__link{margin-top:auto;padding-top:8px;font-family:var(--f-display);font-weight:600;font-size:14px;letter-spacing:.06em;color:var(--lime);display:inline-flex;align-items:center;gap:8px;min-height:44px;align-self:flex-start}
.prod__link:hover{color:var(--fg)}
.prod--next{background:transparent;border:1px dashed var(--line-2);justify-content:center;gap:12px;padding:32px 28px;min-height:280px}
.prod__h--next{font-size:22px}

/* ───────── 7 · Về Zerotech ───────── */
.about{display:flex;flex-wrap:wrap;gap:40px 64px;align-items:flex-start}
.about__copy{flex:1 1 420px;min-width:0;max-width:720px}
.about__h2{font-family:var(--f-display);font-weight:600;font-size:clamp(28px,3.2vw,44px);line-height:1.15;margin:14px 0 0;text-wrap:balance}
.about__p{margin:20px 0 0;max-width:56ch;color:var(--muted)}

/* ───────── 8 · Liên hệ ───────── */
.cta-sec{padding:0 var(--gutter) clamp(64px,8vw,120px)}
.cta{border:1px solid var(--line-2);border-radius:10px;background:var(--panel);padding:clamp(32px,5vw,64px);display:flex;flex-wrap:wrap;justify-content:space-between;align-items:center;gap:32px;position:relative;overflow:hidden}
.cta__copy{min-width:0;flex:1 1 480px}
.cta__h2{font-family:var(--f-display);font-weight:700;font-size:clamp(28px,3.4vw,48px);line-height:1.1;text-wrap:balance}
.cta__p{margin:16px 0 0;color:var(--muted);max-width:52ch}
.cta__act{display:flex;flex-direction:column;gap:12px;min-width:0}
.cta__info{font-family:var(--f-mono);font-size:13px;color:var(--fg-2);text-align:center}

/* ───────── 9 · Footer ───────── */
.ftr{border-top:1px solid var(--line);padding:56px var(--gutter) 32px}
.ftr__grid{display:grid;grid-template-columns:repeat(auto-fit,minmax(220px,1fr));gap:40px}
.ftr__brand{display:flex;align-items:center;gap:14px;min-width:0;align-self:start}
.ftr__brand svg{flex:none}
.ftr__word{font-family:var(--f-display);font-weight:600;font-size:21px;letter-spacing:.2em;line-height:1}
.ftr__sub{font-family:var(--f-mono);font-size:10px;letter-spacing:.22em;color:var(--muted);margin-top:7px}
.ftr__col{min-width:0;font-size:14px;color:var(--muted);line-height:1.7}
.ftr__h{font-family:var(--f-mono);font-weight:400;font-size:11px;letter-spacing:.12em;color:var(--dim);margin:0 0 10px;line-height:1.65}
.ftr__mt{margin-top:4px}
.ftr__mail{display:inline-flex;align-items:center;min-height:44px;color:var(--muted)}
.ftr__links{display:flex;flex-direction:column;align-items:flex-start;line-height:1.9}
.ftr__links .ftr__h{margin-bottom:0}
.ftr__links a{min-height:44px;display:inline-flex;align-items:center}
.ftr__bar{margin-top:48px;padding-top:20px;border-top:1px solid var(--line);display:flex;flex-wrap:wrap;justify-content:space-between;align-items:center;gap:12px;font-family:var(--f-mono);font-size:12px;color:var(--dim);letter-spacing:.04em}
.ftr__lang a{color:var(--muted);display:inline-flex;align-items:center;justify-content:center;min-width:44px;min-height:44px}
.ftr__lang a[aria-current="true"]{color:var(--fg)}
.ftr__lang a:hover{color:var(--lime)}

/* ───────── Responsive ───────── */
@media (max-width:1100px){
  .hdr__in{gap:16px}
  .nav{gap:0 14px;font-size:14px}
  .hdr__cta{padding:0 14px}
  .brand__word{letter-spacing:.16em}
}
@media (max-width:900px){
  .js .nav,.js .hdr__cta{display:none}
  .js .burger{display:grid}
  /* Không có JS: menu xuống dòng thay cho drawer */
  html:not(.js) .hdr__in{flex-wrap:wrap;padding-bottom:8px}
  html:not(.js) .nav{order:3;flex-basis:100%;flex-wrap:wrap}
}
@media (max-width:640px){
  :root{--hdr-h:64px}
  body{font-size:15px;line-height:1.6}
  .hdr{padding:0 16px}
  .hdr__act{gap:8px}
  .brand{gap:10px}
  .brand__mark{width:30px;height:30px}
  .brand__word{font-size:17px}

  .hero{padding:36px 16px 48px}
  .hero__eye{font-size:11px;letter-spacing:.12em;gap:8px}
  .hero__eye .sq--8{width:7px;height:7px}
  .hero__eye-co{display:none}
  .hero__h1{font-size:40px;line-height:1.05;margin-top:16px}
  .hero__lead{margin-top:18px;font-size:16px}
  .hero__viz-m{display:block}
  .hero__viz,.hero__areas{display:none}
  .hero__cta{flex-direction:column;gap:10px;margin-top:24px}
  .hero__cta .btn{display:flex;width:100%;padding:0 16px}
  .hero__cta .btn__arrow{display:none}

  .sec{padding:48px 16px}
  .eyebrow{font-size:11px}
  .h2{font-size:30px;line-height:1.12;margin-top:12px}
  .sec__intro{flex-basis:auto}
  .sec__head{gap:12px}

  .cards{margin-top:28px;gap:12px;grid-template-columns:minmax(0,1fr)}
  .card{padding:22px 20px;display:grid;grid-template-columns:auto minmax(0,1fr);align-items:center;gap:10px 12px}
  .card__head{display:contents}
  .card__ico{width:36px;height:36px}
  .card__tag{display:none}
  .card__h{font-size:20px}
  .card__p,.card .chips{grid-column:1/-1;font-size:inherit}
  .card .chips{font-size:11px;padding-top:0}
  .chips--opt{display:none}

  .tech__viz{display:none}
  .tech__viz-m{display:block;margin-top:24px}
  .panel__hud{padding:10px 12px;font-size:10px;flex-wrap:nowrap}
  .panel__hud .live{gap:6px}
  .log--m{display:block;font-size:11px;letter-spacing:0}
  .log--m>div{padding:10px 12px;gap:10px}
  .log--m>div+div{border-top:1px solid var(--line)}
  .techlist{margin-top:20px}
  .techlist__row{grid-template-columns:36px minmax(0,1fr);gap:0 12px;padding:14px 0}
  .techlist__k{padding-top:3px}
  .techlist__h{font-size:17px}
  .techlist__d{font-size:14px}

  .sec--vision{padding:56px 16px}
  .vision__h2{font-size:40px;line-height:1.02;margin-top:14px}
  .vision__lead{margin-top:18px;font-size:15px}
  .steps{margin-top:32px;border-left:2px solid var(--lime);padding-left:22px}
  .steps__track,.steps__fill,.step__dot{display:none}
  .steps__list{grid-template-columns:minmax(0,1fr);gap:26px}
  .step__n{font-size:11px;margin-top:0}
  .step__h{font-size:21px;margin-top:0}
  .step__p{margin-top:4px;font-size:14px}

  .prods{margin-top:28px;gap:12px;grid-template-columns:minmax(0,1fr)}
  .prod__shot,.prod__img{aspect-ratio:auto;height:200px;font-size:11px}
  .prod__body{padding:20px;gap:8px}
  .prod__h{font-size:22px}
  .prod__dom{font-size:11px}
  .prod__p{font-size:14px}
  .prod__link{padding-top:0}
  .prod--next{display:none}

  .about{gap:24px}
  .about__h2{font-size:26px;line-height:1.18;margin-top:12px}

  .cta-sec{padding:0 16px 48px}
  .cta{padding:28px 20px;flex-direction:column;align-items:stretch;gap:16px}
  .cta__copy{flex-basis:auto}
  .cta__h2{font-size:28px;line-height:1.12}
  .cta__p{margin-top:16px;font-size:14px}
  .cta__act .btn{display:flex;width:100%;min-height:52px}
  .cta__info{font-size:12px}

  .ftr{padding:36px 16px 28px}
  .ftr__grid{grid-template-columns:minmax(0,1fr);gap:24px}
  .ftr__brand{gap:12px}
  .ftr__brand svg{width:40px;height:40px}
  .ftr__word{font-size:19px}
  .ftr__sub{font-size:9px;margin-top:6px}
  .ftr__bar{margin-top:24px;padding-top:16px;font-size:11px}
}
@media (max-width:360px){
  .brand__word{letter-spacing:.14em}
}

/* ───────── Animation (landing-page-build.md §7) ───────── */
@keyframes zt-vf{0%,18%{transform:translate(140px,150px)}25%,43%{transform:translate(470px,140px)}50%,68%{transform:translate(460px,390px)}75%,93%{transform:translate(150px,390px)}100%{transform:translate(140px,150px)}}
@keyframes zt-scan{0%{transform:translateY(0)}100%{transform:translateY(520px)}}
@keyframes zt-spin{to{transform:rotate(360deg)}}
@keyframes zt-pulse{0%{r:7;opacity:.9}100%{r:22;opacity:0}}
@keyframes zt-blink{50%{opacity:.25}}
@keyframes zt-draw{from{stroke-dashoffset:120}to{stroke-dashoffset:0}}
@keyframes zt-rise{from{opacity:.001;transform:translateY(28px)}to{opacity:1;transform:none}}
@keyframes zt-fill{from{transform:scaleX(0)}to{transform:scaleX(1)}}
.zt-vf{animation:zt-vf 10s cubic-bezier(.7,0,.3,1) infinite}
.zt-scan{animation:zt-scan 6s linear infinite}
.zt-spin{transform-box:fill-box;transform-origin:center;animation:zt-spin 24s linear infinite}
.zt-pulse{animation:zt-pulse 2.4s ease-out infinite}
.zt-d1{animation-delay:.6s}
.zt-d2{animation-delay:1.2s}
.zt-d3{animation-delay:1.8s}
.zt-blink{animation:zt-blink 1.2s steps(2) infinite}
.zt-logo-draw path{stroke-dasharray:120;animation:zt-draw 1.6s ease-out both}

/* Scroll reveal + đường Tầm nhìn: chỉ ẩn khi <html class="js"> — tắt JS thì mọi khối hiện đầy đủ */
@media (prefers-reduced-motion:no-preference){
  @supports (animation-timeline: view()){
    .js .zt-rv{animation:zt-rise linear both;animation-timeline:view();animation-range:entry 0% entry 60%}
    .js .zt-fill{animation:zt-fill linear both;animation-timeline:view();animation-range:entry 20% cover 45%}
  }
  @supports not (animation-timeline: view()){
    .js .zt-rv{opacity:.001;transform:translateY(28px)}
    .js .zt-rv.is-in{animation:zt-rise .8s cubic-bezier(.2,.7,.2,1) both}
    .js .zt-fill{transform:scaleX(0)}
    .js .zt-fill.is-in{animation:zt-fill 1.8s ease-out both}
  }
  html{scroll-behavior:smooth}
}
@media (prefers-reduced-motion:reduce){
  .zt-vf,.zt-scan,.zt-spin,.zt-pulse,.zt-blink,.zt-rv,.zt-fill,.zt-logo-draw path,.drawer{animation:none!important}
  .zt-vf{transform:translate(140px,150px)}
  *,*::before,*::after{transition:none!important}
}

/* ───────── 404 ───────── */
.nf{min-height:100vh;min-height:100dvh;display:flex;flex-direction:column;justify-content:center;gap:20px;padding:48px var(--gutter);max-width:1280px;margin:0 auto}
.nf__h{font-family:var(--f-display);font-weight:700;font-size:clamp(36px,5vw,64px);line-height:1.05}
.nf__p{color:var(--muted)}
.nf .hero__cta{margin-top:8px}