/* ===== Linva website ===== */
:root{
  --bg:#FBF8F4; --bg2:#F4F1EC; --card:#FFFFFF;
  --ink:#26242E; --muted:#6F6B79; --line:rgba(38,36,46,.08);
  --accent:#6E78CE; --accent-d:#5660B8; --accent-l:#8A94E4;
  --coral:#ECA294; --coral-l:#F2B7AB;
  --dark:#14152B; --dark-2:#1E2040;
  --hdr-bg:rgba(251,248,244,.82); --field-bg:rgba(38,36,46,.05); --body:#43414d;
  --radius:22px; --maxw:1120px;
  --shadow:0 22px 60px -24px rgba(60,55,110,.30);
  --shadow-sm:0 8px 24px -12px rgba(60,55,110,.22);
}
/* ---- dark theme (manual override + system preference) ---- */
:root[data-theme="dark"]{
  --bg:#101119; --bg2:#161826; --card:#1E2030;
  --ink:#ECEAF3; --muted:#9D99AA; --line:rgba(255,255,255,.09);
  --accent:#8A94E4; --accent-d:#9AA2EC; --accent-l:#8A94E4;
  --dark:#0C0D18; --dark-2:#161936;
  --hdr-bg:rgba(16,17,25,.80); --field-bg:rgba(255,255,255,.07); --body:#CBC8D6;
  --shadow:0 22px 60px -24px rgba(0,0,0,.6);
  --shadow-sm:0 10px 28px -14px rgba(0,0,0,.55);
}
@media (prefers-color-scheme: dark){
  :root:not([data-theme="light"]){
    --bg:#101119; --bg2:#161826; --card:#1E2030;
    --ink:#ECEAF3; --muted:#9D99AA; --line:rgba(255,255,255,.09);
    --accent:#8A94E4; --accent-d:#9AA2EC; --accent-l:#8A94E4;
    --dark:#0C0D18; --dark-2:#161936;
    --hdr-bg:rgba(16,17,25,.80); --field-bg:rgba(255,255,255,.07); --body:#CBC8D6;
    --shadow:0 22px 60px -24px rgba(0,0,0,.6);
    --shadow-sm:0 10px 28px -14px rgba(0,0,0,.55);
  }
}
*{box-sizing:border-box;margin:0;padding:0}
html{scroll-behavior:smooth}
body{
  font-family:-apple-system,BlinkMacSystemFont,"Segoe UI","PingFang SC","Hiragino Sans","Noto Sans CJK SC",system-ui,sans-serif;
  color:var(--ink); background:var(--bg); line-height:1.65; -webkit-font-smoothing:antialiased;
}
a{color:inherit;text-decoration:none}
img{max-width:100%;display:block}
.wrap{max-width:var(--maxw);margin:0 auto;padding:0 24px}
.eyebrow{font-size:13px;font-weight:800;letter-spacing:.16em;text-transform:uppercase;color:var(--accent)}
h1,h2,h3{line-height:1.15;letter-spacing:-.02em;font-weight:800}
.btn{display:inline-flex;align-items:center;gap:8px;font-weight:700;font-size:15px;
  padding:13px 22px;border-radius:14px;border:1px solid transparent;cursor:pointer;transition:.2s}
.btn-primary{background:var(--accent);color:#fff;box-shadow:0 10px 24px -10px rgba(110,120,206,.7)}
.btn-primary:hover{background:var(--accent-d);transform:translateY(-1px)}
.btn-ghost{background:rgba(110,120,206,.08);color:var(--accent-d)}
.btn-ghost:hover{background:rgba(110,120,206,.14)}
.btn-light{background:#fff;color:var(--accent-d)} :root[data-theme=dark] .btn-light{background:#fff} .btn-light:hover{transform:translateY(-1px)}

/* ---- header ---- */
.hdr{position:sticky;top:0;z-index:50;background:var(--hdr-bg);backdrop-filter:saturate(180%) blur(14px);border-bottom:1px solid var(--line)}
.hdr .wrap{display:flex;align-items:center;gap:18px;height:66px}
.brand{display:flex;align-items:center;gap:10px;font-weight:800;font-size:19px}
.brand img{width:30px;height:30px;border-radius:8px}
.nav{display:flex;gap:26px;margin-left:14px}
.nav a{color:var(--muted);font-weight:600;font-size:15px}
.nav a:hover{color:var(--ink)}
.hdr-right{margin-left:auto;display:flex;align-items:center;gap:12px}
.lang{position:relative;display:flex;align-items:center}
.lang svg{position:absolute;left:10px;width:16px;height:16px;color:var(--muted);pointer-events:none}
select.langSelect{appearance:none;-webkit-appearance:none;background:var(--field-bg);border:1px solid var(--line);
  border-radius:11px;padding:8px 30px 8px 32px;font:inherit;font-size:14px;font-weight:600;color:var(--ink);cursor:pointer}
.lang::after{content:"";position:absolute;right:12px;width:7px;height:7px;border-right:2px solid var(--muted);border-bottom:2px solid var(--muted);transform:rotate(45deg);pointer-events:none;margin-top:-2px}
.nav-cta{}
@media(max-width:860px){.nav{display:none}.nav-cta{display:none}}

/* ---- hero ---- */
.hero{position:relative;overflow:hidden}
.hero .wrap{display:grid;grid-template-columns:1.05fr .95fr;gap:40px;align-items:center;padding-top:72px;padding-bottom:84px}
.blob{position:absolute;border-radius:50%;filter:blur(70px);opacity:.5;z-index:0}
.blob.a{width:520px;height:520px;background:var(--accent-l);top:-180px;right:-120px;opacity:.35}
.blob.b{width:420px;height:420px;background:var(--coral);bottom:-160px;left:-120px;opacity:.28}
.hero-copy{position:relative;z-index:2}
.badge{display:inline-flex;align-items:center;gap:8px;background:var(--card);border:1px solid var(--line);
  padding:7px 14px;border-radius:999px;font-size:13px;font-weight:700;color:var(--accent-d);box-shadow:var(--shadow-sm)}
.badge .dot{width:8px;height:8px;border-radius:50%;background:var(--accent)}
.hero h1{font-size:54px;margin:22px 0 16px}
.hero p.lead{font-size:18.5px;color:var(--muted);max-width:30em}
.hero-actions{display:flex;gap:12px;margin-top:30px;flex-wrap:wrap}
.platforms{margin-top:18px;font-size:14px;color:var(--muted);font-weight:600}
.hero-art{position:relative;z-index:2;display:flex;justify-content:center}
.phone{border-radius:40px;background:#0e0e16;padding:8px;box-shadow:var(--shadow);transform:rotate(2deg)}
.phone img{border-radius:33px;width:300px}
@media(max-width:860px){
  .hero .wrap{grid-template-columns:1fr;text-align:center;padding-top:44px}
  .hero h1{font-size:38px}.hero-actions{justify-content:center}.hero p.lead{margin:0 auto}
  .badge{margin:0 auto}.phone img{width:250px}
}

/* ---- section base ---- */
section{padding:84px 0}
.sec-head{text-align:center;max-width:660px;margin:0 auto 52px}
.sec-head h2{font-size:38px;margin:14px 0 12px}
.sec-head p{color:var(--muted);font-size:17px}
.reveal{opacity:0;transform:translateY(22px);transition:.7s cubic-bezier(.2,.7,.2,1)}
.reveal.in{opacity:1;transform:none}

/* ---- features ---- */
.features{background:linear-gradient(180deg,var(--bg),var(--bg2))}
.grid3{display:grid;grid-template-columns:repeat(3,1fr);gap:22px}
.card{background:var(--card);border:1px solid var(--line);border-radius:var(--radius);padding:28px;box-shadow:var(--shadow-sm);transition:.25s}
.card:hover{transform:translateY(-4px);box-shadow:var(--shadow)}
.chip{width:50px;height:50px;border-radius:14px;display:grid;place-items:center;margin-bottom:18px;
  background:linear-gradient(135deg,rgba(110,120,206,.16),rgba(236,162,148,.16))}
.chip svg{width:26px;height:26px;color:var(--accent-d)}
.card h3{font-size:19px;margin-bottom:8px}
.card p{color:var(--muted);font-size:15px}
@media(max-width:860px){.grid3{grid-template-columns:1fr}}

/* ---- how ---- */
.steps{display:grid;grid-template-columns:repeat(4,1fr);gap:20px;counter-reset:step}
.step{position:relative;padding:30px 22px 26px;background:var(--card);border:1px solid var(--line);border-radius:var(--radius);box-shadow:var(--shadow-sm)}
.step .num{width:40px;height:40px;border-radius:12px;background:var(--accent);color:#fff;font-weight:800;display:grid;place-items:center;margin-bottom:16px}
.step h3{font-size:17px;margin-bottom:6px}
.step p{color:var(--muted);font-size:14.5px}
@media(max-width:860px){.steps{grid-template-columns:1fr 1fr}}
@media(max-width:520px){.steps{grid-template-columns:1fr}}

/* ---- screenshots ---- */
.screens{background:linear-gradient(180deg,var(--bg2),var(--bg))}
.shot-grid{display:grid;grid-template-columns:repeat(3,1fr);gap:30px}
.shotcard{text-align:center}
.shotcard .frame{border-radius:34px;background:#0e0e16;padding:7px;box-shadow:var(--shadow);display:inline-block}
.shotcard .frame img{border-radius:28px;width:240px}
.shotcard p{margin-top:16px;font-weight:600;color:var(--ink);font-size:15px}
@media(max-width:860px){.shot-grid{grid-template-columns:1fr 1fr;gap:22px}.shotcard .frame img{width:100%}}
@media(max-width:520px){.shot-grid{grid-template-columns:1fr}}

/* ---- cta band ---- */
.cta{padding:0}
.cta-inner{position:relative;overflow:hidden;background:radial-gradient(120% 140% at 20% 0%,var(--dark-2),var(--dark));
  border-radius:32px;padding:70px 40px;text-align:center;color:#fff;box-shadow:var(--shadow)}
.cta-inner .glow{position:absolute;width:480px;height:480px;border-radius:50%;background:var(--accent);filter:blur(110px);opacity:.45;top:-220px;left:50%;transform:translateX(-50%)}
.cta-inner h2{font-size:38px;position:relative;margin-bottom:12px}
.cta-inner p{position:relative;color:rgba(255,255,255,.8);font-size:17px;margin-bottom:26px}
.cta-inner .btn{position:relative}
.cta-wrap{padding:40px 0 90px}

/* ---- footer ---- */
.ftr{background:var(--dark);color:rgba(255,255,255,.72);padding:56px 0 40px}
.ftr .wrap{display:flex;gap:40px;flex-wrap:wrap;align-items:flex-start;justify-content:space-between}
.ftr .brand{color:#fff}
.ftr-tag{margin-top:12px;max-width:24em;font-size:14.5px}
.ftr-links{display:flex;gap:48px;flex-wrap:wrap}
.ftr-col h4{font-size:13px;letter-spacing:.1em;text-transform:uppercase;color:rgba(255,255,255,.5);margin-bottom:14px;font-weight:700}
.ftr-col a{display:block;color:rgba(255,255,255,.78);margin-bottom:10px;font-size:15px}
.ftr-col a:hover{color:#fff}
.ftr-bottom{border-top:1px solid rgba(255,255,255,.1);margin-top:42px;padding-top:24px;display:flex;justify-content:space-between;gap:16px;flex-wrap:wrap;font-size:13.5px;color:rgba(255,255,255,.55)}
.ftr select.langSelect{background:rgba(255,255,255,.08);border-color:rgba(255,255,255,.16);color:#fff}
.ftr .lang svg,.ftr .lang::after{color:rgba(255,255,255,.7);border-color:rgba(255,255,255,.7)}

/* ---- doc pages (privacy / support) ---- */
.doc-hero{padding:64px 0 24px;background:linear-gradient(180deg,var(--bg2),var(--bg))}
.doc-hero h1{font-size:42px}
.doc-hero .upd{color:var(--muted);margin-top:10px;font-size:14.5px}
.doc{max-width:760px;margin:0 auto;padding:36px 24px 90px}
.doc .lede{font-size:18px;color:var(--muted);margin-bottom:30px}
.doc h2{font-size:21px;margin:30px 0 8px}
.doc p{color:var(--body);margin-bottom:6px}
.doc a{color:var(--accent-d);font-weight:600}
.faq-item{border:1px solid var(--line);border-radius:16px;background:#fff;margin-bottom:14px;overflow:hidden;box-shadow:var(--shadow-sm)}
.faq-q{display:flex;justify-content:space-between;align-items:center;gap:16px;padding:20px 22px;cursor:pointer;font-weight:700;font-size:16.5px}
.faq-q .ic{flex:0 0 auto;width:20px;height:20px;transition:.25s;color:var(--accent)}
.faq-item.open .faq-q .ic{transform:rotate(45deg)}
.faq-a{max-height:0;overflow:hidden;transition:max-height .3s ease;padding:0 22px}
.faq-item.open .faq-a{max-height:320px;padding-bottom:20px}
.faq-a p{color:var(--muted);font-size:15.5px}
.contact-box{margin-top:40px;background:linear-gradient(135deg,rgba(110,120,206,.10),rgba(236,162,148,.10));
  border:1px solid var(--line);border-radius:var(--radius);padding:32px;text-align:center}
.contact-box h2{margin:0 0 8px}
.contact-box p{color:var(--muted);margin-bottom:20px}

/* ---- App Store badge ---- */
.store-badge{display:inline-block;transition:.2s;line-height:0}
.store-badge:hover{transform:translateY(-2px)}
.store-badge img,.store-badge svg{height:54px;width:auto;display:block}
.hero-actions .store-badge img{height:56px}

/* ---- theme toggle ---- */
.theme-toggle{width:40px;height:40px;flex:0 0 auto;border-radius:11px;border:1px solid var(--line);
  background:var(--field-bg);color:var(--ink);display:grid;place-items:center;cursor:pointer;transition:.2s}
.theme-toggle:hover{background:rgba(110,120,206,.14)}
.theme-toggle svg{width:19px;height:19px}
.theme-toggle .moon{display:none}
:root[data-theme="dark"] .theme-toggle .sun{display:none}
:root[data-theme="dark"] .theme-toggle .moon{display:block}

/* ---- download row + QR ---- */
.download-row{display:flex;align-items:center;justify-content:center;gap:28px;flex-wrap:wrap;margin-top:8px;position:relative}
.qr-box{display:flex;align-items:center;gap:14px;background:#fff;border-radius:18px;padding:13px 18px 13px 13px;box-shadow:var(--shadow)}
.qr-box img{width:94px;height:94px;display:block;border-radius:8px}
.qr-cap{text-align:left;max-width:150px}
.qr-cap b{display:block;color:#15162C;font-size:14.5px;margin-bottom:2px}
.qr-cap span{color:#6F6B79;font-size:12.5px;line-height:1.4}
@media(max-width:600px){.qr-box{display:none}}
.ftr-badge{display:inline-block;margin-top:18px}
.ftr-badge img{height:46px;width:auto}