:root{
  /* Paleta neón consistente */
  --bg:#0a0a0f;
  --bg-2:#0f0f16;
  --surface:#12121a;
  --surface-2:#181822;
  --surface-hi:#1e1e2a;
  --border:rgba(0,243,255,.14);
  --border-strong:rgba(0,243,255,.28);

  --text:#e8f4ff;
  --text-2:#a9b8cc;
  --muted:#6b7a8f;

  --cyan:#00f3ff;
  --cyan-soft:rgba(0,243,255,.12);
  --purple:#bc13fe;
  --purple-soft:rgba(188,19,254,.12);
  --mint:#00ffd5;
  --mint-soft:rgba(0,255,213,.12);
  --amber:#ffb547;

  --grad:linear-gradient(135deg,#00f3ff 0%,#7b2cbf 55%,#bc13fe 100%);
  --grad-soft:linear-gradient(135deg,rgba(0,243,255,.18),rgba(188,19,254,.18));

  --shadow-sm:0 4px 20px rgba(0,0,0,.35);
  --shadow:0 10px 40px rgba(0,0,0,.5);
  --shadow-glow:0 0 40px rgba(0,243,255,.18);
  --shadow-glow-strong:0 0 60px rgba(0,243,255,.35);

  --radius:14px;
  --radius-lg:22px;
  --ease:cubic-bezier(.22,1,.36,1);
}

*{box-sizing:border-box}
html{scroll-behavior:smooth}
html,body{background:var(--bg)}
body{
  margin:0;
  min-height:100vh;
  font-family:'Inter',system-ui,-apple-system,Segoe UI,Roboto,sans-serif;
  color:var(--text);
  background:
    radial-gradient(1000px 500px at 15% 10%, rgba(188,19,254,.15), transparent 60%),
    radial-gradient(900px 500px at 90% 20%, rgba(0,243,255,.12), transparent 60%),
    radial-gradient(800px 500px at 50% 100%, rgba(0,255,213,.08), transparent 60%),
    linear-gradient(180deg,#0f0f16 0%, #0a0a0f 100%);
  -webkit-font-smoothing:antialiased;
  text-rendering:optimizeLegibility;
}

/* Fondo decorativo */
.bg-decor{position:fixed;inset:0;pointer-events:none;z-index:0;overflow:hidden}
.blob{position:absolute;border-radius:50%;filter:blur(80px);opacity:.5;animation:float 22s var(--ease) infinite;mix-blend-mode:screen}
.blob-1{width:640px;height:640px;background:radial-gradient(circle,rgba(0,243,255,.28),transparent 60%);top:-200px;left:-160px}
.blob-2{width:560px;height:560px;background:radial-gradient(circle,rgba(188,19,254,.24),transparent 60%);top:20%;right:-180px;animation-delay:-8s}
.blob-3{width:500px;height:500px;background:radial-gradient(circle,rgba(0,255,213,.20),transparent 60%);bottom:-180px;left:25%;animation-delay:-14s}
@keyframes float{
  0%,100%{transform:translate(0,0) scale(1)}
  50%{transform:translate(40px,-30px) scale(1.08)}
}
.grid-overlay{
  position:absolute;inset:0;
  background-image:
    linear-gradient(rgba(0,243,255,.045) 1px,transparent 1px),
    linear-gradient(90deg,rgba(0,243,255,.045) 1px,transparent 1px);
  background-size:64px 64px;
  mask-image:radial-gradient(ellipse at center,black 30%,transparent 75%);
  -webkit-mask-image:radial-gradient(ellipse at center,black 30%,transparent 75%);
}

a{color:inherit;text-decoration:none}
img{max-width:100%;display:block}

/* Header */
.site-header{
  position:sticky;top:0;z-index:50;
  display:flex;align-items:center;justify-content:space-between;gap:20px;
  padding:16px clamp(18px,4vw,56px);
  background:rgba(10,10,15,.55);
  border-bottom:1px solid transparent;
  backdrop-filter:blur(20px) saturate(1.4);
  -webkit-backdrop-filter:blur(20px) saturate(1.4);
  transition:border-color .3s var(--ease), background .3s var(--ease), padding .3s var(--ease);
}
.site-header.scrolled{
  background:rgba(10,10,15,.82);
  border-bottom-color:var(--border);
  padding-top:12px;padding-bottom:12px;
  box-shadow:0 8px 32px rgba(0,0,0,.3);
}
.brand{display:flex;align-items:center;gap:10px;font-weight:700;letter-spacing:.01em;font-size:15px;color:var(--text)}
.brand-icon{display:block;width:34px;height:34px;flex:none;filter:drop-shadow(0 0 7px rgba(0,243,255,.35))}
.brand em{font-style:normal;background:var(--grad);-webkit-background-clip:text;background-clip:text;color:transparent}
.main-nav{display:flex;gap:28px;font:600 12px/1 'Inter',sans-serif;letter-spacing:.14em;text-transform:uppercase}
.main-nav a{position:relative;padding:6px 0;color:var(--text-2);transition:color .2s var(--ease)}
.main-nav a::after{
  content:"";position:absolute;left:0;right:0;bottom:-2px;height:2px;
  background:var(--grad);transform:scaleX(0);transform-origin:left;
  transition:transform .3s var(--ease);
  box-shadow:0 0 10px rgba(0,243,255,.6);
}
.main-nav a:hover{color:var(--cyan)}
.main-nav a:hover::after{transform:scaleX(1)}
.header-controls{display:flex;align-items:center;gap:12px}
.language-switch{display:flex;padding:3px;border:1px solid var(--border);border-radius:999px;background:rgba(24,24,34,.6);backdrop-filter:blur(10px)}
.language-switch button{min-width:34px;padding:7px 10px;border:0;border-radius:999px;background:transparent;color:var(--muted);font:700 11px/1 'Inter',sans-serif;cursor:pointer;letter-spacing:.06em}
.language-switch button[aria-pressed="true"]{background:var(--grad);color:#0a0a0f;box-shadow:0 0 16px rgba(0,243,255,.4)}
.language-switch button:focus-visible{outline:3px solid rgba(0,243,255,.4);outline-offset:2px}
.header-action{
  font:700 12px/1 'Inter',sans-serif;letter-spacing:.08em;text-transform:uppercase;color:#0a0a0f;
  background:var(--grad);
  padding:12px 18px;border-radius:999px;
  box-shadow:0 0 24px rgba(0,243,255,.35), 0 0 0 1px rgba(255,255,255,.08) inset;
  transition:transform .2s var(--ease), box-shadow .2s var(--ease);
}
.header-action:hover{transform:translateY(-2px);box-shadow:0 0 36px rgba(0,243,255,.55), 0 0 0 1px rgba(255,255,255,.12) inset}

/* Hero */
.hero{
  position:relative;z-index:1;
  min-height:calc(100svh - 72px);
  display:grid;
  grid-template-columns:minmax(0,1fr) minmax(300px,.65fr);
  gap:clamp(28px,4vw,62px);
  align-items:center;
  padding:clamp(28px,4vw,56px) clamp(18px,6vw,82px) 40px;
}
.hero-inner{max-width:680px}
.eyebrow{
  display:inline-flex;align-items:center;gap:10px;
  margin:0 0 22px;
  font:700 11px/1 'Inter',sans-serif;
  letter-spacing:.22em;text-transform:uppercase;
  color:var(--cyan);
  padding:9px 16px;border-radius:999px;
  background:var(--surface-2);
  border:1px solid rgba(0,243,255,.32);
  box-shadow:0 0 20px rgba(0,243,255,.15) inset, 0 0 20px rgba(0,243,255,.1);
}
.eyebrow .dot{width:7px;height:7px;border-radius:50%;background:var(--cyan);box-shadow:0 0 12px var(--cyan),0 0 24px rgba(0,243,255,.5);animation:pulse 2.4s ease-in-out infinite}
@keyframes pulse{0%,100%{opacity:1}50%{opacity:.4}}

h1,h2,h3,h4,p{margin-top:0}
h1{
  font-family:'Inter',system-ui,sans-serif;
  font-weight:800;
  font-size:clamp(40px,5.4vw,72px);
  line-height:1.03;
  letter-spacing:-.02em;
  margin-bottom:22px;
  color:var(--text);
}
.grad-text{
  background:var(--grad);
  -webkit-background-clip:text;background-clip:text;color:transparent;
  filter:drop-shadow(0 0 20px rgba(0,243,255,.35));
}
.hero-text{
  font-size:clamp(16px,1.4vw,19px);
  line-height:1.7;color:var(--text-2);
  margin-bottom:28px;max-width:580px;
}
.hero-actions{display:flex;gap:12px;flex-wrap:wrap;margin-bottom:26px}

.button{
  display:inline-flex;align-items:center;justify-content:center;gap:10px;
  min-height:52px;
  border:1px solid transparent;
  border-radius:999px;
  padding:0 26px;
  font:700 12px/1 'Inter',sans-serif;
  letter-spacing:.1em;text-transform:uppercase;
  cursor:pointer;
  transition:transform .22s var(--ease), box-shadow .22s var(--ease), background .22s var(--ease), color .22s var(--ease), border-color .22s var(--ease);
  white-space:nowrap;
  position:relative;overflow:hidden;
}
.button:hover{transform:translateY(-2px)}
.button:active{transform:translateY(0)}
.button:focus-visible{outline:3px solid rgba(0,243,255,.4);outline-offset:3px}
.button svg{flex-shrink:0}
.button.primary{
  color:#0a0a0f;
  background:var(--grad);
  box-shadow:0 0 30px rgba(0,243,255,.35), 0 10px 30px rgba(0,0,0,.4);
}
.button.primary:hover{box-shadow:0 0 44px rgba(0,243,255,.55), 0 14px 38px rgba(0,0,0,.5)}
.button.secondary,
.button.ghost{
  color:var(--text);
  background:rgba(24,24,34,.6);
  border-color:var(--border-strong);
  backdrop-filter:blur(10px);
}
.button.secondary:hover,
.button.ghost:hover{background:rgba(30,30,42,.8);border-color:var(--cyan);color:var(--cyan);box-shadow:0 0 24px rgba(0,243,255,.2)}

.trust-row{display:flex;gap:10px;flex-wrap:wrap;align-items:stretch}
.trust-row span{
  display:inline-flex;align-items:center;justify-content:flex-start;gap:8px;
  padding:10px 16px;
  border:1px solid var(--border);
  border-radius:999px;
  background:var(--surface-2);
  font:600 11px/1.2 'Inter',sans-serif;letter-spacing:.08em;text-transform:uppercase;
  color:var(--text-2);
  transition:border-color .2s var(--ease), color .2s var(--ease);
}
.trust-row span:hover{border-color:var(--cyan);color:var(--cyan)}
.trust-row span svg{color:var(--mint);flex-shrink:0;filter:drop-shadow(0 0 4px rgba(0,255,213,.5))}

/* Phone frame */
.hero-visual{justify-self:center;width:min(100%,400px);position:relative}
.phone-frame{
  position:relative;
  width:min(100%,400px);
  height:min(710px,calc(100svh - 100px));
  aspect-ratio:9/16;
  border:12px solid #05050a;
  border-radius:48px;
  background:#05050a;
  box-shadow:
    0 0 0 1px rgba(0,243,255,.25) inset,
    0 30px 80px rgba(0,0,0,.6),
    0 0 60px rgba(0,243,255,.2);
  overflow:hidden;
  transition:transform .5s var(--ease);
}
.phone-frame::before{
  content:"";position:absolute;inset:-2px;border-radius:50px;pointer-events:none;
  background:conic-gradient(from 0deg, rgba(0,243,255,.4), rgba(188,19,254,.3), rgba(0,255,213,.3), rgba(0,243,255,.4));
  filter:blur(22px);opacity:.55;z-index:-1;
}
.phone-frame:hover{transform:translateY(-6px) rotate(-.3deg)}
.phone-notch{
  position:absolute;top:12px;left:50%;z-index:3;
  width:96px;height:24px;transform:translateX(-50%);
  border-radius:999px;background:#000;
  box-shadow:0 0 0 1px rgba(0,243,255,.15) inset;
}
.phone-notch::after{
  content:"";position:absolute;top:50%;right:14px;
  width:8px;height:8px;border-radius:50%;
  background:radial-gradient(circle,#1a2a30 30%,#000 70%);
  transform:translateY(-50%);box-shadow:0 0 6px rgba(0,243,255,.4)
}
.phone-glow{display:none}
.phone-frame iframe{position:relative;z-index:1;width:100%;height:100%;border:0;background:#0a0a0f}
.hero-caption{
  margin-top:18px;
  display:flex;align-items:center;justify-content:center;gap:8px;
  font:600 11px/1 'Inter',sans-serif;letter-spacing:.14em;text-transform:uppercase;color:var(--muted);
}
.live-dot{
  width:8px;height:8px;border-radius:50%;background:var(--mint);
  box-shadow:0 0 0 0 rgba(0,255,213,.6),0 0 14px rgba(0,255,213,.6);
  animation:livePulse 2s ease-out infinite;
}
@keyframes livePulse{
  0%{box-shadow:0 0 0 0 rgba(0,255,213,.6),0 0 14px rgba(0,255,213,.6)}
  70%{box-shadow:0 0 0 12px rgba(0,255,213,0),0 0 20px rgba(0,255,213,0)}
  100%{box-shadow:0 0 0 0 rgba(0,255,213,0),0 0 0 rgba(0,255,213,0)}
}

/* Sections */
.section{
  position:relative;z-index:1;
  padding:100px clamp(18px,6vw,82px);
  border-top:1px solid var(--border);
}
.section-intro{max-width:820px;margin-bottom:56px}
.section-kicker{
  display:inline-block;
  margin:0 0 18px;
  font:700 11px/1 'Inter',sans-serif;
  letter-spacing:.22em;text-transform:uppercase;
  color:var(--cyan);
  padding:7px 14px;border-radius:6px;
  background:var(--cyan-soft);
  border:1px solid rgba(0,243,255,.28);
}
h2{
  font-family:'Inter',system-ui,sans-serif;
  font-weight:800;
  font-size:clamp(34px,4.2vw,58px);
  line-height:1.08;
  letter-spacing:-.02em;
  margin-bottom:0;
  color:var(--text);
}
.section-lead{
  margin-top:18px;
  font-size:clamp(16px,1.3vw,18px);
  line-height:1.65;color:var(--text-2);
  max-width:640px;
}

/* Steps */
.steps{display:grid;grid-template-columns:repeat(3,1fr);gap:22px}
.step{
  position:relative;
  background:var(--surface);
  border:1px solid var(--border);
  border-radius:var(--radius);
  padding:32px 28px;
  box-shadow:var(--shadow-sm);
  transition:transform .3s var(--ease), box-shadow .3s var(--ease), border-color .3s var(--ease);
  overflow:hidden;
}
.step::before{
  content:"";position:absolute;top:0;left:0;right:0;height:3px;
  background:var(--grad);
  transform:scaleX(0);transform-origin:left;
  transition:transform .4s var(--ease);
  box-shadow:0 0 10px rgba(0,243,255,.6);
}
.step:hover{transform:translateY(-4px);box-shadow:var(--shadow-glow);border-color:var(--border-strong)}
.step:hover::before{transform:scaleX(1)}
.step-num{
  font:700 12px/1 'Inter',sans-serif;
  color:var(--cyan);letter-spacing:.14em;
  margin-bottom:20px;
}
.step-icon{
  width:52px;height:52px;border-radius:14px;
  display:grid;place-items:center;
  background:linear-gradient(135deg,rgba(0,243,255,.14),rgba(188,19,254,.10));
  color:var(--cyan);
  margin-bottom:20px;
  border:1px solid rgba(0,243,255,.2);
}
.step-icon svg{width:26px;height:26px;filter:drop-shadow(0 0 6px rgba(0,243,255,.4))}
.step h3{
  font-weight:700;
  font-size:20px;line-height:1.25;
  margin-bottom:10px;letter-spacing:-.01em;
  color:var(--text);
}
.step p{font:400 14.5px/1.65 'Inter',sans-serif;color:var(--text-2);margin-bottom:0}

/* Benefits */
.benefit-grid{display:grid;grid-template-columns:repeat(4,1fr);gap:20px}
.benefit{
  background:var(--surface);
  border:1px solid var(--border);
  border-radius:var(--radius);
  padding:28px 24px;
  box-shadow:var(--shadow-sm);
  transition:transform .3s var(--ease), box-shadow .3s var(--ease), border-color .3s var(--ease);
}
.benefit:hover{transform:translateY(-4px);box-shadow:var(--shadow-glow);border-color:var(--border-strong)}
.benefit-icon{
  width:46px;height:46px;border-radius:12px;
  display:grid;place-items:center;
  background:color-mix(in srgb, var(--accent) 18%, transparent);
  color:var(--accent);
  margin-bottom:18px;
  border:1px solid color-mix(in srgb, var(--accent) 30%, transparent);
}
.benefit{--accent:var(--cyan)}
.benefit:nth-child(2){--accent:var(--purple)}
.benefit:nth-child(3){--accent:var(--mint)}
.benefit:nth-child(4){--accent:var(--amber)}
.benefit-icon svg{width:22px;height:22px;filter:drop-shadow(0 0 6px color-mix(in srgb, var(--accent) 60%, transparent))}
.benefit h3{
  font-weight:700;font-size:18px;line-height:1.25;
  margin-bottom:8px;letter-spacing:-.01em;
  color:var(--text);
}
.benefit p{font:400 14px/1.6 'Inter',sans-serif;color:var(--text-2);margin-bottom:0}

/* Listening guide */
.tutorial-section{background:linear-gradient(180deg,rgba(0,243,255,.02) 0%,transparent 60%)}
.tutorial-copy{display:grid;grid-template-columns:repeat(2,minmax(0,1fr));gap:28px;max-width:980px;margin-bottom:38px}
.tutorial-copy p{margin:0;font:400 16px/1.75 'Inter',sans-serif;color:var(--text-2)}
.wave-guide{display:grid;grid-template-columns:repeat(5,minmax(0,1fr));gap:14px}
.wave-guide-item{
  min-height:240px;padding:24px 20px;
  border:1px solid var(--border);
  border-top:3px solid var(--accent);
  border-radius:var(--radius);
  background:var(--surface);
  box-shadow:var(--shadow-sm);
  transition:transform .3s var(--ease), box-shadow .3s var(--ease), border-color .3s var(--ease);
}
.wave-guide-item:hover{transform:translateY(-4px);box-shadow:0 0 30px color-mix(in srgb, var(--accent) 30%, transparent);border-color:color-mix(in srgb, var(--accent) 40%, transparent)}
.wave-guide-item.delta{--accent:#6f7aff}
.wave-guide-item.theta{--accent:#bc13fe}
.wave-guide-item.alpha{--accent:#00ffd5}
.wave-guide-item.beta{--accent:#00f3ff}
.wave-guide-item.gamma{--accent:#ffb547}
.wave-range{display:block;margin-bottom:14px;font:700 11px/1 'Inter',sans-serif;letter-spacing:.14em;text-transform:uppercase;color:var(--accent);text-shadow:0 0 10px color-mix(in srgb, var(--accent) 50%, transparent)}
.wave-guide-item h3{margin-bottom:9px;font:700 20px/1.2 'Inter',sans-serif;color:var(--text);letter-spacing:-.01em}
.wave-guide-item p{margin:0;font:400 13.5px/1.65 'Inter',sans-serif;color:var(--text-2)}

.tutorial-deep-dive{display:grid;grid-template-columns:repeat(3,minmax(0,1fr));gap:20px;max-width:1120px;margin-top:46px}
.tutorial-deep-dive article{
  padding:28px 26px;
  border:1px solid var(--border);
  border-radius:var(--radius);
  background:var(--surface);
  box-shadow:var(--shadow-sm);
}
.tutorial-index{display:block;margin-bottom:18px;font:700 11px/1 'Inter',sans-serif;letter-spacing:.18em;color:var(--mint)}
.tutorial-deep-dive h3{margin-bottom:12px;font:700 22px/1.25 'Inter',sans-serif;color:var(--text);letter-spacing:-.01em}
.tutorial-deep-dive p{margin:0;font:400 14.5px/1.7 'Inter',sans-serif;color:var(--text-2)}

.frequency-reference{max-width:1120px;margin-top:44px;padding:32px;border:1px solid var(--border);border-radius:var(--radius-lg);background:var(--surface);box-shadow:var(--shadow-sm)}
.frequency-reference h3{margin-bottom:8px;font:700 24px/1.25 'Inter',sans-serif;color:var(--text);letter-spacing:-.01em}
.frequency-reference > p{max-width:680px;margin:0;font:400 14.5px/1.7 'Inter',sans-serif;color:var(--text-2)}
.frequency-table-wrap{margin-top:24px;overflow-x:auto;border:1px solid var(--border);border-radius:var(--radius);background:var(--surface-2)}
.frequency-table{width:100%;border-collapse:collapse;min-width:620px}
.frequency-table th,
.frequency-table td{
  padding:13px 16px;border-bottom:1px solid var(--border);text-align:left;
  font:400 13.5px/1.5 'Inter',sans-serif;color:var(--text-2);
}
.frequency-table th{
  background:rgba(0,243,255,.08);
  font:700 11px/1 'Inter',sans-serif;letter-spacing:.14em;text-transform:uppercase;
  color:var(--cyan);
}
.frequency-table td:first-child,
.frequency-table td:nth-child(2){white-space:nowrap;font-weight:600;color:var(--text)}
.frequency-table tbody tr:last-child td{border-bottom:0}
.frequency-table tbody tr:hover{background:rgba(0,243,255,.04)}

.frequency-use-grid{display:grid;grid-template-columns:repeat(4,minmax(0,1fr));gap:12px;margin-top:24px}
.frequency-use-grid article{
  padding:18px;border-radius:var(--radius);
  border:1px solid var(--border);border-left:3px solid var(--cyan);
  background:var(--surface-2);
  transition:border-color .2s var(--ease), background .2s var(--ease);
}
.frequency-use-grid article:hover{border-left-color:var(--mint);background:var(--surface-hi)}
.frequency-use-grid h4{margin:0 0 8px;font:700 11px/1 'Inter',sans-serif;letter-spacing:.16em;text-transform:uppercase;color:var(--cyan)}
.frequency-use-grid p{margin:0;font-size:13px;line-height:1.55;color:var(--text-2)}
.frequency-examples{max-width:none !important;margin-top:24px !important;padding-top:20px;border-top:1px solid var(--border);color:var(--text-2) !important}
.frequency-examples b{color:var(--text)}
.tutorial-note{
  max-width:980px;margin-top:26px;padding:18px 22px;
  border:1px solid rgba(255,181,71,.28);border-left:3px solid var(--amber);border-radius:var(--radius);
  background:rgba(255,181,71,.06);
  font:500 14px/1.7 'Inter',sans-serif;color:var(--text-2);
}

/* Advice band */
.advice-band{
  background:
    radial-gradient(600px 300px at 80% 20%, rgba(188,19,254,.14), transparent 60%),
    linear-gradient(135deg,#0a0a12 0%, #14141f 100%);
  border-top:1px solid var(--border);
  border-bottom:1px solid var(--border);
}
.advice-band .section-kicker{color:var(--amber);background:rgba(255,181,71,.10);border-color:rgba(255,181,71,.28)}
.advice-band h2{color:var(--text);max-width:760px}
.advice-band .section-intro{margin-bottom:44px}
.advice-list{display:grid;grid-template-columns:repeat(4,1fr);gap:16px}
.advice-list p{
  min-height:160px;padding:24px;
  border:1px solid var(--border);
  border-radius:var(--radius);
  background:var(--surface);
  color:var(--text-2);
  font:400 14.5px/1.65 'Inter',sans-serif;
  transition:transform .3s var(--ease), background .3s var(--ease), border-color .3s var(--ease);
}
.advice-list p:hover{transform:translateY(-3px);background:var(--surface-hi);border-color:var(--border-strong)}
.advice-list p strong{color:var(--text);font-weight:600}

/* Install */
.install-section{
  display:block;
  background:linear-gradient(135deg,rgba(0,243,255,.08) 0%, rgba(188,19,254,.10) 100%);
  border:1px solid var(--border-strong);
  border-radius:var(--radius-lg);
  padding:48px;
  box-shadow:var(--shadow-glow);
  position:relative;overflow:hidden;
}
.install-section::before{
  content:"";position:absolute;inset:0;pointer-events:none;
  background:
    radial-gradient(400px 200px at 15% 10%, rgba(0,243,255,.14), transparent 60%),
    radial-gradient(400px 200px at 85% 90%, rgba(188,19,254,.14), transparent 60%);
}
.install-text{position:relative;z-index:1}
.install-text h2{margin-bottom:16px}
.install-text .section-lead{color:var(--text-2)}
.install-actions{display:flex;gap:12px;flex-wrap:wrap;margin-top:28px;position:relative;z-index:1}

/* Footer */
.site-footer{
  position:relative;z-index:1;
  display:flex;justify-content:space-between;align-items:center;gap:18px;
  padding:28px clamp(18px,6vw,82px);
  border-top:1px solid var(--border);
  background:rgba(10,10,15,.6);
  backdrop-filter:blur(10px);
}
.footer-brand{display:flex;align-items:center;gap:10px;font:600 13px/1 'Inter',sans-serif;color:var(--text-2);letter-spacing:.04em}
.footer-brand-icon{display:block;width:22px;height:22px;flex:none}
.footer-cta{
  font:700 12px/1 'Inter',sans-serif;letter-spacing:.1em;text-transform:uppercase;
  color:var(--cyan);
  padding:11px 18px;border-radius:999px;
  background:var(--cyan-soft);
  border:1px solid rgba(0,243,255,.32);
  transition:background .2s var(--ease), transform .2s var(--ease), box-shadow .2s var(--ease);
}
.footer-cta:hover{background:rgba(0,243,255,.18);transform:translateX(2px);box-shadow:0 0 20px rgba(0,243,255,.25)}

/* Reveal animations */
.reveal{opacity:0;transform:translateY(24px);transition:opacity .8s var(--ease), transform .8s var(--ease)}
.reveal.visible{opacity:1;transform:translateY(0)}

/* Responsive */
@media (max-width:1080px){
  .benefit-grid{grid-template-columns:repeat(2,1fr)}
  .advice-list{grid-template-columns:repeat(2,1fr)}
  .wave-guide{grid-template-columns:repeat(3,minmax(0,1fr))}
  .tutorial-deep-dive{grid-template-columns:1fr}
  .frequency-use-grid{grid-template-columns:repeat(2,minmax(0,1fr))}
}
@media (max-width:900px){
  .main-nav{display:none}
  .hero{grid-template-columns:1fr;min-height:auto;padding-top:40px}
  .hero-visual{width:min(100%,330px);margin:0 auto}
  .steps{grid-template-columns:1fr}
  .install-section{padding:36px 28px}
}
@media (max-width:620px){
  .site-header{padding:12px 16px}
  .brand span{font-size:14px}
  .header-controls{gap:8px}
  .language-switch button{min-width:30px;padding:7px 8px}
  .header-action{padding:10px 14px;font-size:11px}
  h1{font-size:clamp(34px,9vw,46px)}
  .hero{padding:28px 16px 24px}
  .section{padding:70px 16px}
  .benefit-grid,.advice-list{grid-template-columns:1fr}
  .tutorial-copy,.wave-guide,.tutorial-deep-dive{grid-template-columns:1fr}
  .wave-guide-item{min-height:auto}
  .frequency-use-grid{grid-template-columns:1fr}
  .advice-list p{min-height:auto}
  .button{width:100%;max-width:100%}
  .trust-row{flex-direction:column}
  .trust-row span{width:100%;justify-content:flex-start}
  .phone-frame{border-width:9px;border-radius:36px}
  .site-footer{flex-direction:column;align-items:flex-start;padding:24px 16px;gap:14px}
  .footer-cta{width:100%;text-align:center}
}
@media (prefers-reduced-motion:reduce){
  *,*::before,*::after{animation-duration:.01ms !important;transition-duration:.01ms !important}
}