/* ============================================================
   LVCHA VPN (绿茶VPN) — style.css
   ============================================================ */
:root{
  --green:#1faa59; --green-dark:#178347; --green-light:#e9f8f0; --green-mid:#39c274;
  --red:#e5392f; --gold:#f4c451; --ink:#1a1f24; --ink2:#3a4148; --muted:#6b7480;
  --bg:#ffffff; --bg-alt:#f6f8f7; --border:#e6eae8;
  --radius:14px; --radius-lg:22px; --radius-xl:28px;
  --shadow:0 6px 24px rgba(20,40,30,.08); --shadow-lg:0 18px 50px rgba(20,40,30,.14);
  --maxw:1180px; --accent-strip:#b7a87e;
  --ease-out: cubic-bezier(0.23, 1, 0.32, 1);
  --ease-in-out: cubic-bezier(0.77, 0, 0.175, 1);
}
*,*::before,*::after{box-sizing:border-box;margin:0;padding:0}
html,body{max-width:100%;overflow-x:hidden}
html{scroll-behavior:smooth}
body{font-family:"PingFang SC","Microsoft YaHei","Helvetica Neue",Arial,"Noto Sans SC",sans-serif;
  color:var(--ink);background:var(--bg);line-height:1.65;-webkit-font-smoothing:antialiased;font-size:16px}
img{max-width:100%;height:auto;display:block}
a{color:inherit;text-decoration:none}
ul{list-style:none}
.container{width:100%;max-width:var(--maxw);margin:0 auto;padding:0 20px}
.section{padding:72px 0}
.section-alt{background:var(--bg-alt)}
.section-head{text-align:center;max-width:720px;margin:0 auto 44px}
.section-head h2{font-size:clamp(24px,3.4vw,36px);font-weight:800;letter-spacing:-.01em}
.section-head p{color:var(--muted);margin-top:12px;font-size:17px}

/* ---------- buttons (feedback tier: 140ms press) ---------- */
.btn{display:inline-flex;align-items:center;justify-content:center;gap:10px;
  font-weight:700;border-radius:999px;padding:14px 28px;cursor:pointer;border:0;
  transition:transform .14s var(--ease-out),box-shadow .14s var(--ease-out),background .18s ease;font-size:16px}
@media (hover:hover) and (pointer:fine){ .btn:hover{transform:translateY(-2px)} }
.btn:active{transform:translateY(0) scale(.98)}
.btn-primary{background:var(--green);color:#fff;box-shadow:0 8px 20px rgba(31,170,89,.3)}
.btn-primary:hover{background:var(--green-dark)}
.btn-dark{background:var(--ink);color:#fff;padding:18px 30px;border-radius:16px;font-size:17px;width:100%;max-width:420px}
.btn-dark small{display:block;font-weight:500;font-size:13px;opacity:.7}
.btn-dark:hover{background:#000}
.btn-outline{background:#fff;color:var(--ink);border:1px solid var(--border)}

/* ---------- top accent strip + header ---------- */
.top-strip{height:6px;background:var(--accent-strip)}
.header{position:sticky;top:0;z-index:1000;background:rgba(255,255,255,.9);
  backdrop-filter:saturate(180%) blur(12px);border-bottom:1px solid var(--border)}
.nav{display:flex;align-items:center;justify-content:space-between;height:64px;position:relative}
.nav-logo{display:flex;align-items:center;font-weight:900;font-size:22px;letter-spacing:.5px;color:var(--ink)}
.nav-logo .dot{color:var(--green)}
.nav-right{display:flex;align-items:center;gap:26px}
.nav-links{display:flex;align-items:center;gap:26px}
.nav-links a{position:relative;font-weight:600;color:var(--ink2);font-size:15px;padding:4px 0}
.nav-links a::after{content:"";position:absolute;left:0;right:0;bottom:-4px;height:2px;background:var(--green);
  transform:scaleX(0);transform-origin:left;transition:transform .18s var(--ease-out)}
.nav-links a:hover,.nav-links a.active{color:var(--green)}
.nav-links a:hover::after,.nav-links a.active::after{transform:scaleX(1)}
/* mobile-only rows inside .nav-links — hidden on desktop */
.mobile-lang,.mobile-cta{display:none}
/* language dropdown — hover-intent, 180ms */
.lang{position:relative}
.lang-btn{display:inline-flex;align-items:center;gap:6px;border:1px solid var(--border);
  background:#fff;border-radius:999px;padding:7px 14px;font-size:14px;font-weight:600;cursor:pointer;color:var(--ink2)}
.lang-menu{position:absolute;right:0;top:115%;background:#fff;border:1px solid var(--border);
  border-radius:12px;box-shadow:var(--shadow);min-width:140px;padding:6px;z-index:1001;
  opacity:0;visibility:hidden;transform:translateY(-6px) scale(.97);transform-origin:top right;
  transition:opacity .18s var(--ease-out),transform .18s var(--ease-out),visibility .18s}
.lang-menu.open{opacity:1;visibility:visible;transform:translateY(0) scale(1)}
.lang-menu a{display:block;padding:9px 14px;border-radius:8px;font-size:14px;font-weight:600;color:var(--ink2)}
.lang-menu a:hover{background:var(--green-light);color:var(--green-dark)}
.lang-menu a.active{color:var(--green);background:var(--green-light)}
.nav-toggle{display:none;background:none;border:0;cursor:pointer;width:42px;height:42px;font-size:26px;color:var(--ink)}

/* ---------- warning banner ---------- */
.warn{background:#23282d;color:#f4c451;font-size:14px;overflow:hidden;
  transition:opacity .2s ease,transform .2s var(--ease-out)}
.warn .container{display:flex;align-items:center;justify-content:center;gap:14px;
  padding-top:12px;padding-bottom:12px;text-align:center}
.warn .x{cursor:pointer;color:#9aa1a8;font-weight:700;flex:none;transition:color .15s ease}
.warn .x:hover{color:#fff}
.warn.hide{opacity:0;transform:translateY(-6px)}

/* ---------- hero ---------- */
.hero{padding:64px 0 40px}
.hero .container{display:grid;grid-template-columns:1.05fr .95fr;gap:40px;align-items:center}
.hero-badge{display:inline-flex;align-items:center;gap:8px;background:var(--green-light);
  color:var(--green-dark);font-weight:700;font-size:14px;padding:8px 16px;border-radius:999px;margin-bottom:22px}
.hero h1{font-size:clamp(34px,5.4vw,60px);font-weight:900;letter-spacing:-.02em;line-height:1.12}
.hero .lead{margin-top:18px;background:var(--bg-alt);border-radius:999px;padding:12px 22px;
  display:inline-block;color:var(--ink2);font-size:15px}
.trust{display:flex;gap:40px;margin:34px 0 30px}
.trust .item{text-align:center}
.trust .ic{width:52px;height:52px;margin:0 auto 8px}
.trust .t{color:var(--red);font-weight:800;font-size:18px}
.trust .s{color:var(--muted);font-size:14px}
.dl-other{margin-top:18px;color:var(--green);font-weight:700;font-size:15px;display:inline-block;
  transition:transform .15s var(--ease-out)}
.dl-other:hover{transform:translateX(3px)}
.dl-mini{display:flex;flex-wrap:wrap;gap:10px;margin-top:18px;align-items:center}
.dl-mini a{display:inline-flex;align-items:center;gap:7px;border:1px solid var(--border);
  background:#fff;border-radius:10px;padding:9px 14px;font-size:14px;font-weight:600;color:var(--ink2);
  transition:border-color .15s ease,color .15s ease,transform .15s var(--ease-out)}
@media (hover:hover) and (pointer:fine){ .dl-mini a:hover{border-color:var(--green);color:var(--green);transform:translateY(-1px)} }
.dl-mini .soon{color:var(--muted);font-size:13px}

/* phone mockup (CSS, no external image) */
.phone-wrap{display:flex;justify-content:center}
.phone{width:280px;height:560px;border-radius:42px;background:linear-gradient(160deg,#2a2f36,#11151a);
  padding:14px;box-shadow:var(--shadow-lg);position:relative}
.phone::before{content:"";position:absolute;top:18px;left:50%;transform:translateX(-50%);
  width:120px;height:24px;background:#0c0f13;border-radius:0 0 16px 16px;z-index:2}
.phone .screen{width:100%;height:100%;border-radius:30px;background:linear-gradient(165deg,#eafaf1,#d4f3e1);
  overflow:hidden;position:relative;display:flex;flex-direction:column;align-items:center;padding:48px 18px 18px}
.phone .pill{width:90%;background:#fff;border-radius:14px;box-shadow:0 4px 14px rgba(0,0,0,.06);padding:14px;margin-bottom:12px}
.phone .pill .bar{height:8px;border-radius:6px;background:#e6eae8;margin:6px 0;width:80%}
.phone .pill .bar.s{width:50%}
.phone .conn{width:120px;height:120px;border-radius:50%;background:var(--green);margin:18px auto;
  display:flex;align-items:center;justify-content:center;color:#fff;font-weight:800;font-size:18px;
  box-shadow:0 0 0 0 rgba(31,170,89,.45);animation:pulse-ring 2.4s var(--ease-in-out) infinite}
@keyframes pulse-ring{
  0%{box-shadow:0 0 0 0 rgba(31,170,89,.45)}
  70%{box-shadow:0 0 0 22px rgba(31,170,89,0)}
  100%{box-shadow:0 0 0 0 rgba(31,170,89,0)}
}
@media (prefers-reduced-motion: reduce){ .phone .conn{animation:none} }

/* ---------- referral / promo ---------- */
.promo{background:linear-gradient(135deg,#10331f,#1faa59);color:#fff}
.promo .grid{display:grid;grid-template-columns:1fr 1fr;gap:40px;align-items:center}
.promo h2{font-size:clamp(24px,3vw,34px);font-weight:800}
.promo p{opacity:.92;margin-top:14px}
.promo .cards{display:grid;gap:16px}
.promo .card{background:rgba(255,255,255,.1);border:1px solid rgba(255,255,255,.18);
  border-radius:var(--radius);padding:22px}
.promo .card h3{font-size:17px;margin-bottom:6px}
.promo .card p{font-size:14px;margin-top:4px;opacity:.9}

/* ---------- feature grid (stagger reveal) ---------- */
.feat-grid{display:grid;grid-template-columns:repeat(5,1fr);gap:18px}
.feat{background:#fff;border:1px solid var(--border);border-radius:var(--radius);
  padding:24px 16px;text-align:center;transition:transform .18s var(--ease-out),box-shadow .18s var(--ease-out)}
@media (hover:hover) and (pointer:fine){ .feat:hover{transform:translateY(-4px);box-shadow:var(--shadow)} }
.feat .ic{width:46px;height:46px;margin:0 auto 12px}
.feat .t{font-weight:700;font-size:15px}

/* generic feature-card (used on /features) */
.feature-grid{display:grid;grid-template-columns:repeat(auto-fit,minmax(250px,1fr));gap:18px}
.feature-card{background:#fff;border:1px solid var(--border);border-radius:var(--radius);padding:26px;
  transition:transform .18s var(--ease-out),box-shadow .18s var(--ease-out)}
@media (hover:hover) and (pointer:fine){ .feature-card:hover{transform:translateY(-4px);box-shadow:var(--shadow)} }
.feature-card i{width:46px;height:46px;border-radius:12px;background:var(--green-light);color:var(--green-dark);
  display:flex;align-items:center;justify-content:center;font-size:20px;margin-bottom:14px;font-style:normal;font-weight:800}
.feature-card h3{font-size:17px;font-weight:800;margin-bottom:8px}
.feature-card p{color:var(--muted);font-size:14.5px}

/* ---------- highlight blocks ---------- */
.hl{display:grid;grid-template-columns:1fr 1fr;gap:48px;align-items:center;padding:56px 0;border-bottom:1px solid var(--border)}
.hl:nth-child(even) .hl-media{order:-1}
.hl h3{font-size:clamp(22px,2.6vw,30px);font-weight:800;margin:10px 0 14px}
.hl .sub{color:var(--green);font-weight:700;margin-bottom:8px}
.hl p{color:var(--ink2)}
.hl-media{height:260px;border-radius:var(--radius-lg);background:linear-gradient(150deg,var(--green-light),#cdeeda);
  display:flex;align-items:center;justify-content:center;color:var(--green-dark);font-weight:800;font-size:18px}
.hl-media.alt{background:linear-gradient(150deg,#eef2ff,#dbe4ff);color:#3b4fb0}
.hl-media.v{background:linear-gradient(150deg,#fff1e6,#ffe0c2);color:#b96b1e}
.hl-media.g{background:linear-gradient(150deg,#f3eaff,#e3d2ff);color:#7a44c9}

/* ---------- testimonials ---------- */
.testi-grid{display:grid;grid-template-columns:repeat(3,1fr);gap:20px;max-width:1000px;margin:0 auto}
.testi{background:#fff;border:1px solid var(--border);border-radius:var(--radius-lg);padding:26px;
  box-shadow:var(--shadow);transition:transform .18s var(--ease-out)}
@media (hover:hover) and (pointer:fine){ .testi:hover{transform:translateY(-3px)} }
.testi .stars{color:var(--gold);font-size:15px;margin-bottom:10px;letter-spacing:2px}
.testi .quote{font-size:15.5px;color:var(--ink2);line-height:1.75}
.testi .who{font-weight:700;margin-top:16px}
.testi .src{color:var(--muted);font-size:13px}

/* ---------- pricing table ---------- */
.table-wrap{overflow-x:auto;border:1px solid var(--border);border-radius:var(--radius);background:#fff}
table.pricing{width:100%;border-collapse:collapse;min-width:480px}
table.pricing th,table.pricing td{padding:14px 18px;text-align:center;border-bottom:1px solid var(--border);font-size:15px}
table.pricing thead th{background:var(--ink);color:#fff;font-weight:700}
table.pricing thead th.hl-col{background:var(--green)}
table.pricing tbody td:first-child{text-align:left;color:var(--ink2);font-weight:600}
table.pricing .chk{color:var(--green);font-weight:800}
.cta-row{text-align:center;margin-top:30px}

/* ---------- social ---------- */
.social{display:flex;justify-content:center;gap:16px;margin:22px 0}
.social a{width:48px;height:48px;border-radius:50%;background:var(--green-light);color:var(--green-dark);
  display:flex;align-items:center;justify-content:center;transition:transform .18s var(--ease-out),background .18s ease,color .18s ease}
@media (hover:hover) and (pointer:fine){ .social a:hover{transform:translateY(-3px);background:var(--green);color:#fff} }
.social svg{width:22px;height:22px}

/* ---------- footer ---------- */
.footer{background:#11151a;color:#c3cad1;padding:56px 0 28px}
.footer .cols{display:grid;grid-template-columns:1.4fr 1fr 1fr;gap:36px;margin-bottom:34px}
.footer h4{color:#fff;font-size:15px;margin-bottom:16px}
.footer a{display:block;color:#9aa3ac;padding:5px 0;font-size:14px;transition:color .15s ease}
.footer a:hover{color:var(--green)}
.footer .brand{font-weight:900;font-size:22px;color:#fff;letter-spacing:.5px}
.footer .brand .dot{color:var(--green)}
.footer .tagline{margin-top:12px;font-size:14px;color:#8b949e;max-width:280px}
.footer .bottom{border-top:1px solid #232a31;padding-top:20px;text-align:center;font-size:13px;color:#7b848d}

/* ---------- inner page hero ---------- */
.page-hero{background:linear-gradient(135deg,#10331f,#1faa59);color:#fff;text-align:center;padding:64px 0}
.page-hero h1{font-size:clamp(28px,4vw,42px);font-weight:900}
.page-hero p{opacity:.9;margin-top:10px}
.prose{max-width:820px;margin:0 auto;padding:56px 20px}
.prose h2{font-size:22px;font-weight:800;margin:30px 0 12px}
.prose h3{font-size:18px;font-weight:700;margin:22px 0 8px}
.prose p,.prose li{color:var(--ink2);margin-bottom:10px}
.prose ul{padding-left:20px;list-style:disc}
.prose ul li{margin-bottom:6px}
.prose table{width:100%;border-collapse:collapse;margin:16px 0}
.prose th,.prose td{border:1px solid var(--border);padding:10px 12px;text-align:left;font-size:14.5px}
.prose thead th{background:var(--bg-alt)}

/* ---------- FAQ accordion (height tolerated — no transform equivalent) ---------- */
.faq-list{max-width:780px;margin:0 auto}
.faq-item{border-bottom:1px solid var(--border)}
.faq-q{width:100%;background:none;border:0;text-align:left;padding:18px 0;font-size:16px;font-weight:700;
  cursor:pointer;display:flex;justify-content:space-between;align-items:center;color:var(--ink);gap:16px}
.faq-q .chev{transition:transform .2s var(--ease-out);color:var(--green);flex:none}
.faq-item.open .faq-q .chev{transform:rotate(180deg)}
.faq-a{max-height:0;overflow:hidden;transition:max-height .25s var(--ease-in-out)}
.faq-a p{padding:0 0 18px;color:var(--muted);font-size:15px;line-height:1.7}
.faq-item.open .faq-a{max-height:400px}

/* ---------- platform / download grid ---------- */
.platform-grid{display:grid;grid-template-columns:repeat(auto-fit,minmax(150px,1fr));gap:16px}
.platform-card{background:#fff;border:1px solid var(--border);border-radius:var(--radius);
  padding:26px 16px;text-align:center;transition:transform .18s var(--ease-out),box-shadow .18s var(--ease-out)}
@media (hover:hover) and (pointer:fine){ .platform-card:hover{transform:translateY(-3px);box-shadow:var(--shadow)} }
.platform-card .ic{width:44px;height:44px;margin:0 auto 10px;color:var(--green)}
.platform-card span{font-weight:700;font-size:14.5px;display:block}
.platform-card small{color:var(--muted);font-size:12.5px}

/* ---------- CTA band ---------- */
.cta-band{background:var(--green-light);border-radius:var(--radius-lg);padding:36px;text-align:center;margin:40px 0}
.cta-band h3{font-size:20px;font-weight:800;color:var(--green-dark);margin-bottom:14px}

/* ---------- blog / news ---------- */
.blog-grid{display:grid;grid-template-columns:repeat(3,1fr);gap:22px}
.blog-card{background:#fff;border:1px solid var(--border);border-radius:var(--radius-lg);padding:26px;
  transition:transform .18s var(--ease-out),box-shadow .18s var(--ease-out)}
@media (hover:hover) and (pointer:fine){ .blog-card:hover{transform:translateY(-4px);box-shadow:var(--shadow)} }
.blog-card .tag{display:inline-block;color:var(--green);font-weight:700;font-size:13px;margin-bottom:10px}
.blog-card h3{font-size:17px;font-weight:800;margin-bottom:8px;line-height:1.4}
.blog-card p{color:var(--muted);font-size:14px}
.blog-card .more{display:inline-block;margin-top:14px;font-weight:700;color:var(--green);font-size:14px}

/* ---------- contact form ---------- */
.contact-grid{display:grid;grid-template-columns:1fr 1fr;gap:48px}
.contact-form{display:flex;flex-direction:column;gap:14px}
.form-group{display:flex;flex-direction:column;gap:6px}
.form-group label{font-size:14px;font-weight:700}
.form-group input,.form-group textarea{padding:12px 16px;border:1px solid var(--border);border-radius:var(--radius);
  font-size:15px;font-family:inherit;background:#fff;transition:border-color .15s ease}
.form-group input:focus,.form-group textarea:focus{outline:none;border-color:var(--green)}
.form-group textarea{min-height:120px;resize:vertical}

/* ---------- scroll-reveal (IntersectionObserver-driven) ---------- */
.reveal{opacity:0;transform:translateY(16px);transition:opacity .5s var(--ease-out),transform .5s var(--ease-out)}
.reveal.in{opacity:1;transform:translateY(0)}
.reveal-stagger > *{opacity:0;transform:translateY(14px);transition:opacity .45s var(--ease-out),transform .45s var(--ease-out)}
.reveal-stagger.in > *{opacity:1;transform:translateY(0)}
.reveal-stagger.in > *:nth-child(1){transition-delay:0ms}
.reveal-stagger.in > *:nth-child(2){transition-delay:50ms}
.reveal-stagger.in > *:nth-child(3){transition-delay:100ms}
.reveal-stagger.in > *:nth-child(4){transition-delay:150ms}
.reveal-stagger.in > *:nth-child(5){transition-delay:200ms}
.reveal-stagger.in > *:nth-child(6){transition-delay:250ms}
.reveal-stagger.in > *:nth-child(7){transition-delay:300ms}
.reveal-stagger.in > *:nth-child(8){transition-delay:350ms}
.reveal-stagger.in > *:nth-child(9){transition-delay:400ms}
@media (prefers-reduced-motion: reduce){
  .reveal,.reveal-stagger > *{transition:opacity .25s ease !important;transform:none !important;opacity:1}
  /* safety net for smaller hover lifts elsewhere — instant instead of animated, never removed */
  *,*::before,*::after{transition-duration:.01ms !important;scroll-behavior:auto !important}
}

/* ============================================================
   RESPONSIVE — mobile nav fix + layout collapse
   ============================================================ */
@media (max-width:900px){
  .hero .container{grid-template-columns:1fr;text-align:center}
  .hero-badge{margin-left:auto;margin-right:auto}
  .trust{justify-content:center;gap:30px}
  .dl-mini{justify-content:center}
  .promo .grid,.hl{grid-template-columns:1fr;gap:26px}
  .hl:nth-child(even) .hl-media{order:0}
  .hl-media{height:200px}
  .feat-grid{grid-template-columns:repeat(3,1fr)}
  .testi-grid{grid-template-columns:1fr}
  .blog-grid{grid-template-columns:repeat(2,1fr)}
  .contact-grid{grid-template-columns:1fr}
  .footer .cols{grid-template-columns:1fr 1fr}
}
@media (max-width:768px){
  .section{padding:52px 0}
  .container.nav{padding-right:8px}
  .nav-right{display:none}
  .nav-toggle{display:block}
  /* .nav-links doubles as the mobile panel: full-width dropdown below the header */
  .nav-links{display:none;position:fixed;top:70px;left:0;right:0;width:100vw;height:calc(100vh - 70px);
    background:#fff;z-index:999;flex-direction:column;align-items:center;gap:0;padding:10px 20px 26px;
    overflow-y:auto;border-top:1px solid var(--border)}
  .nav-links.open{display:flex}
  .nav-links li{width:100%;max-width:420px}
  .nav-links a{display:block;width:100%;text-align:center;padding:16px 0;font-size:18px;
    border-bottom:1px solid var(--border)}
  .nav-links a::after{display:none}
  .nav-links a:hover{color:var(--green)}
  .mobile-lang{display:flex;justify-content:center;gap:10px;margin-top:22px;padding:0}
  .mobile-lang a{display:inline-flex;align-items:center;justify-content:center;flex:none;
    border:1px solid var(--border);border-radius:999px;white-space:nowrap;height:38px;line-height:38px;
    padding:0 20px;font-weight:700;font-size:15px;color:var(--ink2);width:auto;text-align:center}
  .mobile-lang a.active{background:var(--green);color:#fff;border-color:var(--green)}
  .mobile-cta{display:block;margin-top:18px;text-align:center}
  .mobile-cta .btn{width:auto;display:inline-flex}
  .blog-grid{grid-template-columns:1fr}
}
@media (max-width:560px){
  .feat-grid{grid-template-columns:repeat(2,1fr)}
  .footer .cols{grid-template-columns:1fr}
  .trust{gap:20px}
  .trust .ic{width:44px;height:44px}
  .phone{width:240px;height:480px}
  .hero h1{font-size:34px}
}
@media (min-width:769px){ .nav-toggle{display:none} }