/* ============================================================
   Blue Sky VPN — design system
   Refined dark theme, 4px spacing scale, single accent.
   ============================================================ */
:root{
  /* surfaces */
  --bg:        #070a14;
  --bg-soft:   #0b1020;
  --surface:   #10162b;
  --surface-2: #161d36;
  --line:      #222b48;
  --line-soft: #1a2138;

  /* text */
  --ink:       #eef2ff;
  --ink-dim:   #9aa6c8;
  --ink-faint: #5e6a8c;

  /* accent */
  --accent:    #4f7cff;
  --accent-2:  #6ea0ff;
  --accent-ink:#ffffff;
  --glow:      rgba(79,124,255,.45);

  /* status */
  --ok:#34d399; --ok-bg:rgba(52,211,153,.12);
  --warn:#f5b14c; --warn-bg:rgba(245,177,76,.12);
  --bad:#fb6a6a; --bad-bg:rgba(251,106,106,.12);

  --r-lg:20px; --r:14px; --r-sm:10px;
  --shadow:0 24px 60px -20px rgba(0,0,0,.6);
  --shadow-sm:0 8px 24px -12px rgba(0,0,0,.5);
  --maxw:1120px;
  --font:-apple-system,BlinkMacSystemFont,"Segoe UI",Roboto,Inter,Helvetica,Arial,sans-serif;
}

*{box-sizing:border-box}
html{-webkit-text-size-adjust:100%}
body{
  margin:0; font-family:var(--font); color:var(--ink); background:var(--bg);
  line-height:1.55; -webkit-font-smoothing:antialiased; text-rendering:optimizeLegibility;
  overflow-x:hidden;
}
a{color:inherit;text-decoration:none}
h1,h2,h3,h4{margin:0;line-height:1.12;letter-spacing:-.02em;font-weight:700}
p{margin:0}
img{max-width:100%;display:block}
.wrap{max-width:var(--maxw);margin:0 auto;padding:0 24px}
.muted{color:var(--ink-dim)}
.faint{color:var(--ink-faint)}
.hidden{display:none!important}

/* ambient background glows */
body::before{
  content:"";position:fixed;inset:0;z-index:-1;pointer-events:none;
  background:
    radial-gradient(800px 420px at 78% -8%, rgba(79,124,255,.18), transparent 62%),
    radial-gradient(700px 380px at -6% 6%, rgba(110,160,255,.12), transparent 58%);
}

/* ---------------- buttons ---------------- */
.btn{
  display:inline-flex;align-items:center;justify-content:center;gap:8px;
  padding:12px 20px;border-radius:var(--r);font-weight:600;font-size:15px;
  cursor:pointer;border:1px solid transparent;transition:transform .12s ease,
  filter .15s ease,background .15s ease,border-color .15s ease;white-space:nowrap;
  font-family:inherit;
}
.btn:active{transform:translateY(1px)}
.btn-primary{background:linear-gradient(180deg,var(--accent-2),var(--accent));
  color:var(--accent-ink);box-shadow:0 10px 30px -10px var(--glow)}
.btn-primary:hover{filter:brightness(1.07)}
.btn-ghost{background:rgba(255,255,255,.045);border-color:var(--line);color:var(--ink)}
.btn-ghost:hover{background:rgba(255,255,255,.08);border-color:var(--accent)}
.btn-soft{background:var(--surface-2);border-color:var(--line);color:var(--ink)}
.btn-soft:hover{border-color:var(--accent)}
.btn-block{width:100%}
.btn-sm{padding:9px 14px;font-size:14px;border-radius:var(--r-sm)}
.btn:disabled{opacity:.5;cursor:not-allowed}

/* ---------------- nav ---------------- */
.nav{position:sticky;top:0;z-index:30;backdrop-filter:blur(14px);
  background:rgba(7,10,20,.7);border-bottom:1px solid var(--line-soft)}
.nav-inner{display:flex;align-items:center;height:66px;gap:20px}
.brand{display:flex;align-items:center;gap:9px;font-weight:800;font-size:19px;letter-spacing:-.02em}
.brand .dot{width:22px;height:22px;border-radius:7px;
  background:linear-gradient(135deg,var(--accent-2),var(--accent));
  box-shadow:0 4px 14px -2px var(--glow)}
.brand b{font-weight:800}.brand span{color:var(--accent-2)}
.nav-links{display:flex;gap:26px;margin-left:18px}
.nav-links a{color:var(--ink-dim);font-size:15px;transition:color .15s}
.nav-links a:hover{color:var(--ink)}
.nav .spacer{flex:1}

/* ---------------- hero ---------------- */
.hero{padding:84px 0 56px;position:relative}
.hero-grid{display:grid;grid-template-columns:1.05fr .95fr;gap:56px;align-items:center}
.eyebrow{display:inline-flex;align-items:center;gap:8px;padding:7px 14px;border-radius:999px;
  border:1px solid var(--line);background:rgba(79,124,255,.07);color:var(--accent-2);
  font-size:13px;font-weight:600;margin-bottom:22px}
.eyebrow .pulse{width:7px;height:7px;border-radius:50%;background:var(--ok);
  box-shadow:0 0 0 0 rgba(52,211,153,.6);animation:pulse 2s infinite}
@keyframes pulse{0%{box-shadow:0 0 0 0 rgba(52,211,153,.5)}70%{box-shadow:0 0 0 8px rgba(52,211,153,0)}100%{box-shadow:0 0 0 0 rgba(52,211,153,0)}}
.hero h1{font-size:clamp(34px,5vw,56px);font-weight:800;letter-spacing:-.03em}
.hero h1 .grad{background:linear-gradient(120deg,var(--accent-2),#a9c2ff);
  -webkit-background-clip:text;background-clip:text;-webkit-text-fill-color:transparent}
.hero .lead{color:var(--ink-dim);font-size:clamp(16px,2vw,19px);margin:22px 0 30px;max-width:520px}
.hero-cta{display:flex;gap:12px;flex-wrap:wrap}
.trust{display:flex;gap:22px;flex-wrap:wrap;margin-top:30px}
.trust span{display:flex;align-items:center;gap:8px;color:var(--ink-dim);font-size:14px}
.trust svg{width:16px;height:16px;color:var(--accent-2);flex:none}

/* hero device mockup */
.hero-visual{position:relative}
.device{background:linear-gradient(180deg,var(--surface),var(--bg-soft));
  border:1px solid var(--line);border-radius:24px;padding:22px;box-shadow:var(--shadow);
  position:relative;overflow:hidden}
.device::before{content:"";position:absolute;inset:0;
  background:radial-gradient(400px 160px at 80% -10%,rgba(79,124,255,.16),transparent 70%)}
.device-head{display:flex;align-items:center;justify-content:space-between;position:relative}
.device-head .title{font-weight:700;font-size:15px}
.device-head .conn{display:flex;align-items:center;gap:7px;color:var(--ok);font-size:13px;font-weight:600}
.device-head .conn i{width:8px;height:8px;border-radius:50%;background:var(--ok);box-shadow:0 0 10px var(--ok)}
.shield{margin:26px auto 18px;width:96px;height:96px;border-radius:26px;display:grid;place-items:center;
  background:radial-gradient(circle at 50% 30%,rgba(79,124,255,.3),rgba(79,124,255,.06));
  border:1px solid rgba(79,124,255,.3);position:relative}
.shield svg{width:46px;height:46px;color:var(--accent-2)}
.metrics{display:grid;grid-template-columns:repeat(3,1fr);gap:10px;position:relative}
.metric{background:rgba(255,255,255,.03);border:1px solid var(--line-soft);border-radius:12px;padding:12px;text-align:center}
.metric .v{font-weight:700;font-size:16px}
.metric .k{color:var(--ink-faint);font-size:12px;margin-top:2px}

/* ---------------- sections ---------------- */
.section{padding:64px 0}
.section-head{text-align:center;max-width:620px;margin:0 auto 40px}
.section-head h2{font-size:clamp(26px,3.5vw,36px)}
.section-head p{color:var(--ink-dim);margin-top:12px;font-size:17px}

.features{display:grid;grid-template-columns:repeat(3,1fr);gap:18px}
.feature{background:var(--surface);border:1px solid var(--line-soft);border-radius:var(--r-lg);
  padding:26px;transition:transform .18s ease,border-color .18s ease}
.feature:hover{transform:translateY(-4px);border-color:var(--line)}
.feature .ic{width:46px;height:46px;border-radius:13px;display:grid;place-items:center;
  background:rgba(79,124,255,.12);color:var(--accent-2);margin-bottom:16px}
.feature .ic svg{width:24px;height:24px}
.feature h3{font-size:18px;margin-bottom:8px}
.feature p{color:var(--ink-dim);font-size:15px}

/* steps */
.steps{display:grid;grid-template-columns:repeat(3,1fr);gap:18px;counter-reset:s}
.step{position:relative;background:var(--surface);border:1px solid var(--line-soft);
  border-radius:var(--r-lg);padding:26px}
.step .n{width:34px;height:34px;border-radius:10px;display:grid;place-items:center;
  font-weight:700;color:var(--accent-ink);background:linear-gradient(180deg,var(--accent-2),var(--accent));
  margin-bottom:14px;box-shadow:0 8px 20px -8px var(--glow)}
.step h3{font-size:17px;margin-bottom:6px}
.step p{color:var(--ink-dim);font-size:15px}

/* tariffs */
.tariffs{display:grid;grid-template-columns:1fr 1fr;gap:22px;max-width:840px;margin:0 auto}
.plan{position:relative;background:var(--surface);border:1px solid var(--line);
  border-radius:var(--r-lg);padding:30px;display:flex;flex-direction:column}
.plan.pro{border-color:rgba(79,124,255,.5);
  background:linear-gradient(180deg,rgba(79,124,255,.06),var(--surface));
  box-shadow:0 0 0 1px rgba(79,124,255,.18),0 30px 70px -30px var(--glow)}
.plan .tag{position:absolute;top:-12px;left:50%;transform:translateX(-50%);
  background:linear-gradient(180deg,var(--accent-2),var(--accent));color:var(--accent-ink);
  font-size:12px;font-weight:700;padding:5px 14px;border-radius:999px;letter-spacing:.01em}
.plan h3{font-size:23px}
.plan .sub{color:var(--ink-dim);font-size:14px;margin:6px 0 18px}
.plan .from{display:flex;align-items:baseline;gap:6px;margin-bottom:18px}
.plan .from .big{font-size:34px;font-weight:800;letter-spacing:-.03em}
.plan .from .per{color:var(--ink-faint);font-size:14px}
.feat-list{list-style:none;padding:0;margin:0 0 22px;display:grid;gap:11px}
.feat-list li{display:flex;gap:10px;align-items:flex-start;font-size:15px;color:var(--ink-dim)}
.feat-list svg{width:18px;height:18px;color:var(--accent-2);flex:none;margin-top:2px}
.plan .btn{margin-top:auto}
.price-mini{display:flex;flex-wrap:wrap;gap:8px;margin-bottom:20px}
.price-mini span{font-size:13px;color:var(--ink-dim);background:rgba(255,255,255,.04);
  border:1px solid var(--line-soft);border-radius:999px;padding:5px 11px}
.price-mini b{color:var(--ink)}

/* faq */
.faq{max-width:760px;margin:0 auto;display:grid;gap:12px}
.faq details{background:var(--surface);border:1px solid var(--line-soft);border-radius:var(--r);
  padding:4px 20px;transition:border-color .15s}
.faq details[open]{border-color:var(--line)}
.faq summary{cursor:pointer;font-weight:600;list-style:none;padding:16px 0;display:flex;
  justify-content:space-between;align-items:center;gap:12px}
.faq summary::-webkit-details-marker{display:none}
.faq summary::after{content:"+";color:var(--accent-2);font-size:20px;font-weight:400;transition:transform .2s}
.faq details[open] summary::after{transform:rotate(45deg)}
.faq p{color:var(--ink-dim);padding:0 0 18px;font-size:15px}

/* cta band */
.cta-band{background:linear-gradient(135deg,rgba(79,124,255,.14),rgba(110,160,255,.05));
  border:1px solid var(--line);border-radius:var(--r-lg);padding:48px;text-align:center}
.cta-band h2{font-size:clamp(24px,3vw,32px)}
.cta-band p{color:var(--ink-dim);margin:12px 0 26px;font-size:17px}

/* footer */
.footer{border-top:1px solid var(--line-soft);margin-top:40px;padding:34px 0}
.footer-inner{display:flex;justify-content:space-between;align-items:center;gap:18px;flex-wrap:wrap}
.footer .brand{font-size:17px}
.footer-links{display:flex;gap:22px;flex-wrap:wrap}
.footer-links a{color:var(--ink-dim);font-size:14px}
.footer-links a:hover{color:var(--ink)}

/* reveal on scroll */
.reveal{opacity:0;transform:translateY(18px);transition:opacity .6s ease,transform .6s ease}
.reveal.in{opacity:1;transform:none}

/* ============================================================
   App (dashboard) — shared components
   ============================================================ */
.app-shell{max-width:560px;margin:0 auto;padding:24px 18px 72px;min-height:100vh}
.app-top{display:flex;align-items:center;gap:12px;margin-bottom:22px}
.app-top .spacer{flex:1}

.card{background:var(--surface);border:1px solid var(--line-soft);border-radius:var(--r-lg);
  padding:22px;margin-bottom:16px;box-shadow:var(--shadow-sm)}
.card h2{font-size:20px;margin-bottom:4px}
.card h3{font-size:15px;font-weight:700;margin-bottom:14px;color:var(--ink)}
.card .sub{color:var(--ink-dim);font-size:14px}

.row-kv{display:flex;justify-content:space-between;align-items:center;gap:12px;
  padding:13px 0;border-bottom:1px solid var(--line-soft);font-size:15px}
.row-kv:first-of-type{padding-top:0}
.row-kv:last-child{border-bottom:none;padding-bottom:0}
.row-kv .k{color:var(--ink-dim)}
.row-kv .v{font-weight:600;text-align:right}

.badge{display:inline-flex;align-items:center;gap:6px;padding:4px 11px;border-radius:999px;
  font-size:13px;font-weight:600}
.badge.ok{background:var(--ok-bg);color:var(--ok)}
.badge.warn{background:var(--warn-bg);color:var(--warn)}
.badge.bad{background:var(--bad-bg);color:var(--bad)}
.badge i{width:7px;height:7px;border-radius:50%;background:currentColor}

.meter{height:9px;border-radius:6px;background:rgba(255,255,255,.06);overflow:hidden;margin:10px 0 6px}
.meter i{display:block;height:100%;border-radius:6px;
  background:linear-gradient(90deg,var(--accent),var(--accent-2));transition:width .5s ease}
.meter.warn i{background:linear-gradient(90deg,var(--warn),#ffd089)}

.field{width:100%;padding:14px 16px;border-radius:var(--r);border:1px solid var(--line);
  background:var(--bg-soft);color:var(--ink);font-size:16px;outline:none;
  transition:border-color .15s;font-family:inherit}
.field:focus{border-color:var(--accent)}
.field::placeholder{color:var(--ink-faint)}
.label{font-size:13px;color:var(--ink-dim);margin-bottom:8px;font-weight:600}

.grid-2{display:grid;grid-template-columns:1fr 1fr;gap:10px}
.actions{display:grid;gap:10px;margin-top:4px}

.seg{display:grid;grid-template-columns:1fr 1fr;gap:8px;margin-bottom:8px}
.seg.cols-2{grid-template-columns:1fr 1fr}
.seg button{padding:13px 10px;border-radius:var(--r);border:1px solid var(--line);
  background:var(--bg-soft);color:var(--ink);cursor:pointer;font-weight:600;font-size:14px;
  font-family:inherit;transition:border-color .15s,background .15s}
.seg button:hover{border-color:var(--accent)}
.seg button.active{border-color:var(--accent);background:rgba(79,124,255,.14);color:var(--accent-2)}
.seg button .p2{display:block;font-size:12px;font-weight:500;color:var(--ink-faint);margin-top:2px}
.seg button.active .p2{color:var(--accent-2)}

.opt{display:flex;justify-content:space-between;align-items:center;gap:12px;padding:14px;
  border:1px solid var(--line-soft);border-radius:var(--r);margin-bottom:10px}
.opt .t{font-size:14px}.opt .t span{display:block;color:var(--ink-faint);font-size:13px;margin-top:2px}
.stepper{display:flex;align-items:center;gap:8px}
.stepper button{width:36px;height:36px;border-radius:10px;border:1px solid var(--line);
  background:var(--bg-soft);color:var(--ink);font-size:18px;cursor:pointer;display:grid;place-items:center}
.stepper button:hover{border-color:var(--accent)}
.stepper .n{min-width:22px;text-align:center;font-weight:700}

.total-row{display:flex;justify-content:space-between;align-items:center;
  padding-top:14px;margin-top:6px;border-top:1px solid var(--line-soft)}
.total-row .v{font-size:22px;font-weight:800;letter-spacing:-.02em}

.list-row{display:flex;justify-content:space-between;align-items:center;gap:10px;
  padding:13px 14px;border:1px solid var(--line-soft);border-radius:var(--r);margin-bottom:9px;font-size:14px}
.list-row .meta{color:var(--ink-faint);font-size:13px;margin-top:2px}

.back{display:inline-flex;align-items:center;gap:7px;color:var(--ink-dim);cursor:pointer;
  font-size:14px;margin-bottom:16px;font-weight:500}
.back:hover{color:var(--ink)}

.note{color:var(--ink-dim);font-size:14px}
.note-warn{color:var(--warn);font-size:14px;margin-top:8px}
.empty{text-align:center;padding:14px 0;color:var(--ink-dim);font-size:14px}

.copy-box{display:flex;gap:8px;align-items:center;background:var(--bg-soft);
  border:1px solid var(--line);border-radius:var(--r);padding:10px 12px;margin:10px 0}
.copy-box input{flex:1;border:none;background:none;color:var(--ink);font-size:13px;outline:none;font-family:inherit}

.spinner{width:24px;height:24px;border:3px solid rgba(255,255,255,.15);
  border-top-color:var(--accent-2);border-radius:50%;animation:spin .8s linear infinite;display:inline-block}
@keyframes spin{to{transform:rotate(360deg)}}
.center{text-align:center}

.toast{position:fixed;left:50%;bottom:26px;transform:translate(-50%,16px);opacity:0;
  background:var(--surface-2);border:1px solid var(--line);color:var(--ink);padding:13px 18px;
  border-radius:var(--r);box-shadow:var(--shadow);font-size:14px;z-index:80;max-width:90vw;
  transition:opacity .25s,transform .25s;pointer-events:none}
.toast.show{opacity:1;transform:translate(-50%,0)}

/* ---------------- responsive ---------------- */
@media (max-width:880px){
  .hero{padding:56px 0 40px}
  .hero-grid{grid-template-columns:1fr;gap:40px}
  .hero-visual{max-width:420px}
  .features,.steps{grid-template-columns:1fr}
  .tariffs{grid-template-columns:1fr;max-width:440px}
  .nav-links{display:none}
  .section{padding:48px 0}
  .cta-band{padding:34px 22px}
}
@media (max-width:480px){
  .wrap{padding:0 18px}
  .grid-2{grid-template-columns:1fr}
}