/* 零一拓饮 V7 · shared 零一 family look: black space, heavy type, thin-edged cards, gradient titles. */
:root{
  --bg:#000;--bg-soft:#060606;--card:#0a0a0a;--card-2:#121212;
  --ink:#f6f6f6;--ink-2:#cfcfcf;--muted:#8d8d8d;--line:#ffffff1a;--line-2:#ffffff33;
  --grad:linear-gradient(90deg,#4a8bff 0%,#7a62ff 52%,#a65bff 100%);
  --tea:#bcd8b0;--tea-deep:#7fa874;--tea-soft:#bcd8b014;
  --radius:28px;--header:76px;
  --sans:"HarmonyOS Sans SC","PingFang SC","Microsoft YaHei","Noto Sans SC",system-ui,sans-serif;
  --serif:"Songti SC","STSong","Noto Serif SC","SimSun",serif;
  color-scheme:dark;
}
html[data-theme="light"]{
  --bg:#f6f6f3;--bg-soft:#efefeb;--card:#fff;--card-2:#f3f3ef;
  --ink:#0b0b0b;--ink-2:#333;--muted:#6c6c6c;--line:#0000001a;--line-2:#00000030;
  --grad:linear-gradient(90deg,#2864f0 0%,#5d45ea 52%,#8a35e6 100%);
  --tea:#3f6b45;--tea-deep:#3f6b45;--tea-soft:#3f6b4512;
  color-scheme:light;
}
*,*::before,*::after{box-sizing:border-box}
html{scroll-behavior:smooth;scroll-padding-top:calc(var(--header) + 12px);-webkit-text-size-adjust:100%}
body{margin:0;background:var(--bg);color:var(--ink);font-family:var(--sans);line-height:1.7;overflow-x:hidden;transition:background-color .3s,color .3s}
img{display:block;max-width:100%;height:auto}
a{color:inherit;text-decoration:none}
button{font:inherit;color:inherit;cursor:pointer}
h1,h2,h3,p{margin:0}
:focus-visible{outline:2px solid #7a62ff;outline-offset:3px}
.wrap{width:min(1180px,calc(100% - 64px));margin-inline:auto}
.skip-link{position:fixed;left:16px;top:-60px;z-index:100;padding:10px 16px;border-radius:12px;background:var(--ink);color:var(--bg)}
.skip-link:focus{top:12px}
.sr-only{position:absolute;width:1px;height:1px;overflow:hidden;clip:rect(0 0 0 0);white-space:nowrap}

/* Moving tunnel grid that sits behind the whole page, like the 零一 AI 日新社 site. */
#tunnel{position:fixed;inset:0;z-index:-2;width:100%;height:100%;pointer-events:none}
.tunnel-shade{position:fixed;inset:0;z-index:-1;pointer-events:none;background:radial-gradient(ellipse at 50% 45%,transparent 0,var(--bg) 78%);opacity:.55}

/* Header */
.site-header{position:fixed;inset:0 0 auto;z-index:30;height:var(--header);display:flex;align-items:center;justify-content:space-between;gap:20px;padding:0 32px;transition:background-color .25s,border-color .25s,backdrop-filter .25s;border-bottom:1px solid transparent}
.site-header.scrolled{background:color-mix(in srgb,var(--bg) 78%,transparent);backdrop-filter:blur(14px);border-bottom-color:var(--line)}
.wordmark{display:flex;align-items:center;gap:12px;font-weight:900;font-size:16px;letter-spacing:.04em}
.logo-tile{width:36px;height:36px;border-radius:10px;overflow:hidden;background:#000;border:1px solid #ffffff26;flex:none}
.logo-tile img{width:100%;height:100%;object-fit:cover;transform:scale(1.35)}
.main-nav{display:flex;gap:30px;font-size:14px;color:var(--muted)}
.main-nav a{position:relative;padding:8px 0;transition:color .2s}
.main-nav a:hover,.main-nav a[aria-current="true"]{color:var(--ink)}
.main-nav a[aria-current="true"]::after{content:"";position:absolute;left:0;right:0;bottom:0;height:2px;border-radius:2px;background:var(--grad)}
.header-tools{display:flex;align-items:center;gap:12px}
.tool-button{display:inline-flex;align-items:center;gap:8px;height:40px;padding:0 15px;border-radius:12px;border:1px solid var(--line-2);background:var(--card);font-size:13px;font-weight:700;white-space:nowrap}
.tool-button:hover{background:var(--card-2)}
.tool-button b{font-size:18px;font-weight:400;line-height:1}

/* Shared parts */
.chip{display:inline-flex;align-items:center;gap:8px;height:32px;padding:0 15px;border-radius:999px;border:1px solid var(--line-2);background:color-mix(in srgb,var(--card) 80%,transparent);font-size:12px;font-weight:700;letter-spacing:.04em;color:var(--ink-2);white-space:nowrap}
.chip i{width:6px;height:6px;border-radius:50%;background:var(--grad);display:block}
.btn{display:inline-flex;align-items:center;justify-content:center;gap:12px;min-height:54px;padding:0 28px;border-radius:16px;border:1px solid var(--line-2);background:var(--card);font-size:15px;font-weight:700;letter-spacing:.02em;transition:transform .2s,background-color .2s,border-color .2s;white-space:nowrap}
.btn:hover{transform:translateY(-2px);background:var(--card-2);border-color:color-mix(in srgb,var(--ink) 40%,transparent)}
.btn-primary{background:var(--ink);color:var(--bg);border-color:var(--ink)}
.btn-primary:hover{background:var(--ink);opacity:.9}
.btn .arrow{transition:transform .2s}
.btn:hover .arrow{transform:translateX(4px)}
.section{padding:120px 0 40px;position:relative}
.sec-title{display:inline-block;font-size:clamp(34px,4.4vw,52px);font-weight:900;line-height:1.25;letter-spacing:.02em;background:var(--grad);-webkit-background-clip:text;background-clip:text;color:transparent}
.sec-lead{margin-top:14px;font-size:17px;color:var(--ink-2);font-weight:500}
.panel{border:1px solid var(--line);border-radius:var(--radius);background:var(--card);position:relative;overflow:hidden}
.reveal{opacity:0;transform:translateY(26px);transition:opacity .8s ease,transform .8s ease}
.reveal.visible,.no-motion .reveal{opacity:1;transform:none}

/* Dialogs */
dialog{border:1px solid var(--line-2);border-radius:24px;background:var(--bg-soft);color:var(--ink);padding:0;max-width:calc(100vw - 32px);max-height:calc(100dvh - 32px)}
dialog::backdrop{background:#000c;backdrop-filter:blur(6px)}
.close-button{position:absolute;top:16px;right:16px;z-index:3;width:44px;height:44px;border-radius:50%;border:1px solid var(--line-2);background:var(--card);font-size:16px;display:grid;place-items:center}
.close-button:hover{background:var(--card-2)}
body.modal-open{overflow:hidden}
.nav-dialog{margin:0 0 0 auto;height:100dvh;max-height:100dvh;width:min(420px,100vw);border-radius:0;border-width:0 0 0 1px;padding:96px 36px 40px}
.nav-dialog nav{display:grid}
.nav-dialog nav a{display:flex;justify-content:space-between;padding:20px 0;border-bottom:1px solid var(--line);font-size:22px;font-weight:900}
.nav-dialog p{margin-top:32px;color:var(--muted);font-size:14px;font-weight:700}
.photo-dialog{width:min(1200px,96vw);height:92dvh;overflow:hidden}
.photo-dialog[open]{display:flex;flex-direction:column}
.photo-stage{flex:1;min-height:0;position:relative;padding:70px 24px 10px}
.photo-stage img{width:100%;height:100%;object-fit:contain}
.photo-stage .step{position:absolute;top:50%;transform:translateY(-50%);width:48px;height:48px;border-radius:50%;border:1px solid #ffffff40;background:#000a;color:#fff;font-size:18px}
.photo-stage .prev{left:20px}.photo-stage .next{right:20px}
.photo-foot{display:flex;justify-content:space-between;align-items:center;gap:20px;padding:16px 28px 22px;font-size:14px;font-weight:700}
.photo-foot span:last-child{color:var(--muted);font-family:Consolas,monospace;letter-spacing:.1em}
.image-dialog{width:min(820px,96vw);height:92dvh;overflow:hidden}
.image-dialog[open]{display:flex}
.image-dialog img{width:100%;height:100%;object-fit:contain;padding:64px 20px 20px}

/* Footer */
.site-footer{margin-top:120px;border-top:1px solid var(--line);padding:42px 0 52px}
.site-footer .wrap{display:flex;flex-wrap:wrap;align-items:center;justify-content:space-between;gap:20px}
.site-footer p{color:var(--muted);font-size:13px;font-weight:700}
.footer-links{display:flex;flex-wrap:wrap;gap:22px;font-size:13px;color:var(--muted)}
.footer-links a:hover{color:var(--ink)}

/* Light theme fine-tuning */
html[data-theme="light"] .logo-tile{border-color:#0000}
html[data-theme="light"] dialog::backdrop{background:#0008}

@media(max-width:960px){
  .main-nav{display:none}
}
@media(max-width:760px){
  :root{--header:64px;--radius:22px}
  .wrap{width:calc(100% - 32px)}
  .site-header{padding:0 16px}
  .wordmark{font-size:15px;gap:10px}
  .logo-tile{width:32px;height:32px}
  .tool-button{height:38px;padding:0 12px}
  .section{padding:84px 0 24px}
  .sec-lead{font-size:15px}
  .btn{min-height:50px;padding:0 22px;font-size:14px}
  .photo-stage{padding:64px 8px 8px}
  .photo-stage .prev{left:10px}.photo-stage .next{right:10px}
  .photo-foot{padding:14px 18px 18px;font-size:13px}
  .nav-dialog{padding:84px 24px 32px}
}
@media(max-width:380px){.theme-label{display:none}}
@media(prefers-reduced-motion:reduce){
  html{scroll-behavior:auto}
  *,*::before,*::after{transition-duration:.01ms!important;animation-duration:.01ms!important;animation-iteration-count:1!important}
}

/* ===== V7.1 polish, following the apple-design principles: respond on press, critically damped
   motion on transform/opacity only, translucent materials, motion that can be reduced. ===== */
:root{--ease-out:cubic-bezier(.22,1,.36,1);--ease-press:cubic-bezier(.3,.7,.4,1);--edge:#ffffff2e;--edge-soft:#ffffff08;--glow:#7a62ff26}
html[data-theme="light"]{--edge:#ffffffd9;--edge-soft:#0000000a;--glow:#5d45ea18}

/* Section titles: the blue-violet gradient keeps flowing. The gradient repeats seamlessly. */
.sec-title{background-image:linear-gradient(90deg,#4a8bff 0%,#7a62ff 25%,#c46bff 50%,#7a62ff 75%,#4a8bff 100%);background-size:200% 100%;background-repeat:repeat-x;animation:title-flow 7s linear infinite;letter-spacing:.01em}
html[data-theme="light"] .sec-title{background-image:linear-gradient(90deg,#2864f0 0%,#5d45ea 25%,#a03be6 50%,#5d45ea 75%,#2864f0 100%)}
@keyframes title-flow{to{background-position:200% 0}}

/* Translucent header material. */
.site-header.scrolled{background:color-mix(in srgb,var(--bg) 62%,transparent);-webkit-backdrop-filter:saturate(180%) blur(20px);backdrop-filter:saturate(180%) blur(20px)}

/* Feedback starts on press, not on release. */
.btn,.tool-button,.filter,.close-button,.photo-stage .step,.moment-arrows button{transition:transform .35s var(--ease-out),background-color .2s,border-color .2s,opacity .2s}
.btn:active,.tool-button:active,.filter:active,.close-button:active,.photo-stage .step:active,.moment-arrows button:active{transform:scale(.96);transition-duration:.08s}
.btn:hover{transform:translateY(-2px)}
.btn:hover:active{transform:translateY(-1px) scale(.97)}
.btn-primary{position:relative;overflow:hidden;isolation:isolate;box-shadow:0 10px 30px -12px color-mix(in srgb,var(--ink) 55%,transparent)}
.btn-primary::after{content:"";position:absolute;inset:0;z-index:-1;background:linear-gradient(105deg,transparent 35%,color-mix(in srgb,var(--bg) 22%,transparent) 50%,transparent 65%);transform:translateX(-110%);transition:transform .9s var(--ease-out)}
.btn-primary:hover::after{transform:translateX(110%)}

/* Cards get a lit top edge and a soft light that follows the pointer (set by ui.js). */
.panel{isolation:isolate;transition:transform .5s var(--ease-out),border-color .3s,box-shadow .5s var(--ease-out)}
.panel::before{content:"";position:absolute;inset:0;border-radius:inherit;padding:1px;pointer-events:none;z-index:2;background:linear-gradient(180deg,var(--edge),var(--edge-soft) 40%,transparent);-webkit-mask:linear-gradient(#000 0 0) content-box,linear-gradient(#000 0 0);-webkit-mask-composite:xor;mask:linear-gradient(#000 0 0) content-box exclude,linear-gradient(#000 0 0)}
.panel::after{content:"";position:absolute;inset:0;border-radius:inherit;pointer-events:none;z-index:1;opacity:0;transition:opacity .4s;background:radial-gradient(420px circle at var(--mx,50%) var(--my,50%),var(--glow),transparent 65%)}
.panel.lit::after{opacity:1}
html[data-theme="light"] .panel{box-shadow:0 1px 2px #0000000a,0 12px 40px -24px #00000033}

/* Reveal: rise with a critically damped curve; children follow one after another. */
.reveal{transform:translateY(28px);transition:opacity 1s var(--ease-out),transform 1.1s var(--ease-out);transition-delay:calc(var(--stagger,0) * 90ms)}

/* Dialogs grow out of the thing that opened them (origin set by ui.js). */
dialog[open]{animation:dialog-in .5s var(--ease-out) both}
dialog[open]::backdrop{animation:fade-in .35s ease both}
@keyframes dialog-in{from{opacity:0;transform:scale(.94)}to{opacity:1;transform:none}}
@keyframes fade-in{from{opacity:0}}
.nav-dialog[open]{animation:sheet-in .55s var(--ease-out) both}
@keyframes sheet-in{from{transform:translateX(40px);opacity:0}}

/* QR tiles respond like the cards. */
.qr-tile{transition:transform .5s var(--ease-out),border-color .3s}
.qr-tile:hover{transform:translateY(-4px);border-color:var(--line-2)}

@media(prefers-reduced-transparency:reduce){.site-header.scrolled{background:var(--bg);backdrop-filter:none;-webkit-backdrop-filter:none}}
@media(prefers-contrast:more){:root{--line:#ffffff55;--line-2:#ffffff88}html[data-theme="light"]{--line:#00000055;--line-2:#00000088}.sec-title{animation:none;background:none;color:var(--ink)}}
@media(prefers-reduced-motion:reduce){
  .sec-title{animation:none}
  .reveal{transform:none;transition:opacity .4s ease}
  dialog[open],.nav-dialog[open]{animation:fade-in .2s ease both}
  .btn:active,.tool-button:active,.filter:active{transform:none}
  .btn-primary::after{display:none}
}

/* ===== V7.2 apple-design pass ===== */
/* Critically damped spring (damping 1.0, response 0.4 s), sampled into CSS. */
:root{--spring:linear(0,0.0579,0.1813,0.3223,0.457,0.5749,0.673,0.7519,0.8138,0.8615,0.8977,0.925,0.9453,0.9602,0.9712,0.9793,0.9851,0.9893,0.9924,0.9946,0.9961,0.9973,0.9981,0.9986,1);--spring-time:.59s}
.btn,.tool-button,.filter,.close-button,.photo-stage .step,.moment-arrows button,.qr-tile,.panel,.wall-card,.brand-products a{transition-timing-function:var(--spring);transition-duration:var(--spring-time)}
.btn:active,.tool-button:active,.filter:active,.close-button:active,.photo-stage .step:active,.moment-arrows button:active{transform:scale(.97);transition:transform .1s ease-out}

/* Tracking follows size: large text tighter, small labels slightly open, body at zero. */
.sec-title{letter-spacing:0;line-height:1.15}
.sec-lead,.contact-copy p,.brand-text{letter-spacing:0}

/* Header: a soft scroll-edge fade instead of a hard 1px divider; vibrancy-friendly nav text. */
.site-header.scrolled{border-bottom-color:transparent}
.site-header::after{content:"";position:absolute;left:0;right:0;top:100%;height:22px;pointer-events:none;opacity:0;transition:opacity .3s;background:linear-gradient(color-mix(in srgb,var(--bg) 55%,transparent),transparent)}
.site-header.scrolled::after{opacity:1}
.main-nav{color:var(--ink-2)}
.main-nav a{font-weight:500;letter-spacing:.01em}

/* The navigation sheet is a heavier material over the page; no hard divider lines inside. */
.nav-dialog{background:color-mix(in srgb,var(--bg-soft) 72%,transparent);-webkit-backdrop-filter:blur(30px) saturate(180%);backdrop-filter:blur(30px) saturate(180%);border-color:var(--line)}
.nav-dialog nav a{border-bottom-color:color-mix(in srgb,var(--line) 60%,transparent)}
.nav-dialog::backdrop{background:#0006}

/* Modal scrim materialises: dims and blurs in together. */
dialog[open]::backdrop{animation:scrim-in .45s ease both}
@keyframes scrim-in{from{opacity:0;-webkit-backdrop-filter:blur(0);backdrop-filter:blur(0)}}
@keyframes dialog-in{from{opacity:0;transform:scale(.92)}to{opacity:1;transform:none}}
dialog[open]{animation:dialog-in var(--spring-time) var(--spring) both}
.nav-dialog[open]{animation:sheet-in var(--spring-time) var(--spring) both}
@keyframes sheet-in{from{transform:translateX(100%)}}

/* Touch screens have no hover: never leave a card or button stuck in its lifted state. */
@media(hover:none){
  .btn:hover,.panel:hover,.qr-tile:hover,.wall-card:hover,.brand-products a:hover,.product:hover,.poster:hover,.act-list .panel:hover{transform:none}
  .btn-primary::after{display:none}
}
@media(prefers-reduced-transparency:reduce){
  .nav-dialog,.ribbon,.hero .chip{background:var(--bg-soft);-webkit-backdrop-filter:none;backdrop-filter:none}
}
@media(prefers-reduced-motion:reduce){
  dialog[open],.nav-dialog[open]{animation:fade-in .2s ease both}
  dialog[open]::backdrop{animation:fade-in .2s ease both}
}