/* ===== Sfera-Ex — style.css ===== */

:root{
  --bg-0: #05070f;
  --bg-1: #070c1c;
  --bg-2: #0b1330;
  --panel: rgba(255,255,255,0.055);
  --panel-border: rgba(255,255,255,0.18);
  --text-0: #eaf2ff;
  --text-1: #b8c6e6;
  --text-2: #7e8db3;
  --blue: #3b6ff0;
  --cyan: #3fd6f0;
  --green: #5cf2c6;
  --grad: linear-gradient(90deg, var(--cyan), var(--blue));
  --grad-2: linear-gradient(90deg, var(--green), var(--cyan));
  --radius: 16px;
  --container: 1160px;
  --font-body: 'Inter', system-ui, -apple-system, Segoe UI, sans-serif;
  --font-head: 'Space Grotesk', 'Inter', system-ui, sans-serif;
}

*, *::before, *::after{ box-sizing: border-box; }
html{ scroll-behavior: smooth; }
body{
  margin:0;
  font-family: var(--font-body);
  color: var(--text-1);
  background-color: var(--bg-0);
  background-image:
    radial-gradient(ellipse 120% 60% at 50% 0%, #101c45 0%, var(--bg-1) 45%, var(--bg-0) 100%),
    radial-gradient(1.5px 1.5px at 20% 8%, rgba(255,255,255,0.85) 100%, transparent 0),
    radial-gradient(1px 1px at 70% 18%, rgba(255,255,255,0.65) 100%, transparent 0),
    radial-gradient(1.5px 1.5px at 85% 4%, rgba(207,228,255,0.75) 100%, transparent 0),
    radial-gradient(1px 1px at 40% 24%, rgba(255,255,255,0.55) 100%, transparent 0),
    radial-gradient(1.5px 1.5px at 92% 14%, rgba(255,255,255,0.65) 100%, transparent 0),
    radial-gradient(1px 1px at 10% 19%, rgba(207,228,255,0.55) 100%, transparent 0),
    radial-gradient(1.5px 1.5px at 55% 3%, rgba(255,255,255,0.65) 100%, transparent 0),
    radial-gradient(1px 1px at 30% 16%, rgba(255,255,255,0.55) 100%, transparent 0),
    radial-gradient(1.5px 1.5px at 65% 27%, rgba(255,255,255,0.65) 100%, transparent 0),
    radial-gradient(1px 1px at 5% 7%, rgba(255,255,255,0.55) 100%, transparent 0);
  background-repeat: no-repeat, repeat, repeat, repeat, repeat, repeat, repeat, repeat, repeat, repeat, repeat;
  background-size: 100% 900px, 600px 600px, 600px 600px, 600px 600px, 600px 600px, 600px 600px, 600px 600px, 600px 600px, 600px 600px, 600px 600px, 600px 600px;
  background-position: top center;
  line-height: 1.6;
  -webkit-font-smoothing: antialiased;
}

h1,h2,h3,h4{ font-family: var(--font-head); color: var(--text-0); margin: 0 0 .5em; line-height: 1.2; }
p{ margin: 0 0 1em; }
a{ color: var(--cyan); text-decoration: none; }
a:hover{ color: var(--green); }
ul{ margin:0; padding:0; list-style:none; }
img{ max-width:100%; display:block; }
button{ font-family: inherit; cursor:pointer; }

.container{
  width: 100%;
  max-width: var(--container);
  margin: 0 auto;
  padding: 0 24px;
}

/* Buttons */
.btn{
  display:inline-flex; align-items:center; gap:.5em;
  padding: 13px 22px;
  border-radius: 999px;
  font-weight: 600;
  font-size: .95rem;
  border: 1px solid transparent;
  white-space: nowrap;
}
.btn-primary{
  background: var(--grad);
  color: #04101f;
}
.btn-primary:hover{ filter: brightness(1.08); color:#04101f; }
.btn-ghost{
  background: transparent;
  border-color: var(--panel-border);
  color: var(--text-0);
}
.btn-ghost:hover{ border-color: var(--cyan); color: var(--cyan); }
.btn-sm{ padding: 9px 16px; font-size: .85rem; }

/* Header */
.site-header{
  position: sticky; top:0; z-index: 50;
  background: rgba(5,7,15,0.85);
  -webkit-backdrop-filter: blur(10px);
  backdrop-filter: blur(10px);
  border-bottom: 1px solid var(--panel-border);
}
.header-inner{
  display:flex; align-items:center; gap: 24px;
  height: 92px;
}
.brand-logo{ height: 42px; width:auto; }
.main-nav{
  display:flex; gap: 28px; margin-left: 12px; flex: 1;
}
.main-nav a{
  color: var(--text-1); font-weight:500; font-size:.95rem;
}
.main-nav a:hover{ color: var(--text-0); }
.header-cta{ margin-left:auto; }
.nav-toggle{
  display:none;
  flex-direction:column; gap:5px;
  background:none; border:none; padding:8px; margin-left: 8px;
}
.nav-toggle span{
  width:22px; height:2px; background: var(--text-0); border-radius:2px;
}

/* Hero */
.hero{ padding: 72px 0 40px; overflow:hidden; }
.hero-inner{
  display:grid; grid-template-columns: 1.05fr 1fr; gap: 40px; align-items:center;
}
.eyebrow{
  font-family: var(--font-body);
  color: var(--cyan); font-weight:600; letter-spacing:2px; text-transform:uppercase; font-size:.8rem;
  line-height: 1.6;
  margin: 0 0 14px;
}
.hero-headline{
  font-family: var(--font-head);
  font-weight: 700;
  line-height: 1.2;
  margin: 0 0 .5em;
  font-size: clamp(2rem, 4vw, 3rem);
  background: linear-gradient(90deg, #ffffff, #c9dcff 55%, var(--cyan));
  -webkit-background-clip:text; background-clip:text; color:transparent;
}
.hero-lead{ font-size: 1.05rem; color: var(--text-1); max-width: 52ch; }
.hero-actions{ display:flex; gap:16px; flex-wrap:wrap; margin: 22px 0 14px; }
.hero-note{ color: var(--text-2); font-size: .9rem; }

/* Orbit */
.hero-orbit{
  position: relative;
  aspect-ratio: 1/1;
  max-width: 560px;
  margin: 0 auto;
}
.orbit-svg{ width:100%; height:100%; }
.ring{ fill:none; stroke-width: 1.4; }
.ring-1{ stroke: rgba(63,214,240,0.35); }
.ring-2{ stroke: rgba(59,111,240,0.4); }
.ring-3{ stroke: rgba(92,242,198,0.35); }

.orbit-center{
  position:absolute; top:50%; left:50%; transform: translate(-50%,-50%);
  text-align:center; z-index:2;
}
.orbit-center-text{
  font-family: system-ui, -apple-system, 'Segoe UI', Roboto, sans-serif;
  font-weight: 900;
  font-style: italic;
  font-size: clamp(1.5rem, 3.2vw, 2.1rem);
  letter-spacing: -0.5px;
}
.orbit-center-text .oct-1{
  background: linear-gradient(135deg, #ffffff 0%, #e0f2fe 60%, #bae6fd 100%);
  -webkit-background-clip:text; background-clip:text; color:transparent;
}
.orbit-center-text .oct-2{
  background: linear-gradient(90deg, #38bdf8 0%, #0369a1 100%);
  -webkit-background-clip:text; background-clip:text; color:transparent;
}

.orbit-layer{
  position:absolute; inset:0;
}
.coin{
  position:absolute;
  filter: drop-shadow(0 0 10px rgba(63,214,240,0.35));
}
/* positions approximate an elliptical arrangement */
.coin-a{ top: 6%;  left: 47%; }
.coin-b{ top: 46%; left: 88%; }
.coin-c{ top: 14%; left: 84%; }
.coin-d{ top: 68%; left: 76%; }
.coin-e{ top: 22%; left: 10%; }
.coin-f{ top: 62%; left: 6%; }
.coin-g{ top: 82%; left: 26%; }
.coin-h{ top: 84%; left: 50%; }

.spin-slow{ animation: spin 40s linear infinite; }
.spin-med{ animation: spin 30s linear infinite reverse; }
.spin-fast{ animation: spin 24s linear infinite; }

@keyframes spin{
  from{ transform: rotate(0deg); }
  to{ transform: rotate(360deg); }
}
.orbit-layer .coin{ animation: counter-spin inherit; }
.spin-slow .coin{ animation: counterspin-slow 40s linear infinite; }
.spin-med .coin{ animation: counterspin-med 30s linear infinite reverse; }
.spin-fast .coin{ animation: counterspin-fast 24s linear infinite; }

@keyframes counterspin-slow{ from{ transform: rotate(0deg);} to{ transform: rotate(-360deg);} }
@keyframes counterspin-med{ from{ transform: rotate(0deg);} to{ transform: rotate(360deg);} }
@keyframes counterspin-fast{ from{ transform: rotate(0deg);} to{ transform: rotate(-360deg);} }

@media (prefers-reduced-motion: reduce){
  .spin-slow, .spin-med, .spin-fast,
  .spin-slow .coin, .spin-med .coin, .spin-fast .coin{ animation: none !important; }
}

/* About */
.about{ padding: 20px 0 64px; }
.about-text{
  max-width: 820px; margin: 0 auto; text-align:center;
  font-size: 1.05rem; color: var(--text-1);
  padding: 28px 32px; border-radius: var(--radius);
  background: var(--panel); border: 1px solid var(--panel-border);
}

/* Sections */
.section{ padding: 72px 0; }
.section-alt{ background: linear-gradient(180deg, rgba(255,255,255,0.02), transparent); }
.section-title{ font-size: clamp(1.6rem, 3vw, 2.1rem); text-align:center; }
.section-sub{ text-align:center; color: var(--text-2); max-width: 60ch; margin: 0 auto 40px; }
.subsection-title{ margin-top: 56px; text-align:center; font-size: 1.2rem; }

/* Coin grid */
.coin-grid{
  display:grid; grid-template-columns: repeat(4, 1fr); gap: 16px;
}
.coin-card{
  display:flex; align-items:center; gap:14px;
  padding: 18px 20px; border-radius: var(--radius);
  background: var(--panel); border: 1px solid var(--panel-border);
  transition: transform .2s ease, border-color .2s ease;
}
.coin-card:hover{ transform: translateY(-3px); border-color: rgba(63,214,240,0.4); }
.coin-card span{ display:flex; flex-direction:column; color: var(--text-0); font-weight:600; }
.coin-card span em{ font-style:normal; color: var(--text-2); font-size:.8rem; font-weight:500; }

/* Methods */
.method-grid{
  display:grid; grid-template-columns: 1fr 1fr; gap: 20px; margin-top: 24px;
}
.method-card{
  padding: 26px 28px; border-radius: var(--radius);
  background: var(--panel); border: 1px solid var(--panel-border);
}
.method-card h4{ margin-bottom: 14px; }
.method-card li{
  padding: 8px 0; color: var(--text-1);
  border-top: 1px solid var(--panel-border);
}
.method-card li:first-child{ border-top:none; }

/* Steps */
.steps-grid{
  display:grid; grid-template-columns: repeat(4, 1fr); gap: 20px;
}
.step-card{
  padding: 26px 22px; border-radius: var(--radius);
  background: var(--panel); border: 1px solid var(--panel-border);
}
.step-num{
  display:inline-block; font-family: var(--font-head); font-weight:700;
  font-size: 1.4rem; color: transparent;
  background: var(--grad); -webkit-background-clip:text; background-clip:text;
  margin-bottom: 10px;
}
.step-card p{ color: var(--text-1); font-size: .95rem; margin:0; }

/* Advantages */
.advantages-grid{
  display:grid; grid-template-columns: repeat(3, 1fr); gap: 20px;
}
.advantage{
  display:flex; gap:14px; padding: 20px; border-radius: var(--radius);
  background: var(--panel); border: 1px solid var(--panel-border);
}
.advantage svg{ flex-shrink:0; margin-top:2px; }
.advantage h4{ margin-bottom:4px; font-size: 1rem; }
.advantage p{ margin:0; font-size:.9rem; color: var(--text-2); }

/* Contact */
.contact-grid{
  display:grid; grid-template-columns: 1fr 1.1fr; gap: 48px; align-items:start;
}
.contact-line{
  display:flex; align-items:center; gap:12px;
  padding: 14px 18px; margin-bottom: 12px;
  border-radius: 999px; background: var(--panel); border: 1px solid var(--panel-border);
  color: var(--text-0); font-weight:600; width:fit-content;
}
.contact-line:hover{ border-color: var(--cyan); color: var(--cyan); }
.contact-hint{ color: var(--text-2); font-size: .92rem; margin-top: 18px; max-width: 48ch; }

.contact-form{
  padding: 28px; border-radius: var(--radius);
  background: var(--panel); border: 1px solid var(--panel-border);
}
.form-row{ margin-bottom: 18px; }
.form-row-split{ display:grid; grid-template-columns: 1fr 1fr; gap: 16px; }
.form-row label{
  display:block; font-size:.85rem; font-weight:600; color: var(--text-1); margin-bottom:6px;
}
.form-row input, .form-row textarea{
  width:100%; padding: 12px 14px; border-radius: 10px;
  background: rgba(255,255,255,0.03); border: 1px solid var(--panel-border);
  color: var(--text-0); font-family: inherit; font-size: .95rem;
}
.form-row input:focus, .form-row textarea:focus{
  outline:none; border-color: var(--cyan);
}
.form-actions{ display:flex; gap: 14px; flex-wrap:wrap; margin-top: 6px; }
.form-status{ margin: 14px 0 0; font-size:.88rem; color: var(--green); min-height: 1.2em; }

/* Footer */
.site-footer{
  padding: 40px 0 32px; border-top: 1px solid var(--panel-border); text-align:center;
}
.footer-logo{ height: 32px; margin: 0 auto 14px; opacity:.9; }
.footer-copy{ color: var(--text-1); font-size:.9rem; margin-bottom: 6px; }
.footer-disclaimer{ color: var(--text-2); font-size:.8rem; max-width: 60ch; margin: 0 auto; }

/* Responsive */
@media (max-width: 980px){
  .hero-inner{ grid-template-columns: 1fr; }
  .hero-orbit{ order:-1; max-width: 420px; }
  .coin-grid{ grid-template-columns: repeat(2, 1fr); }
  .steps-grid{ grid-template-columns: repeat(2, 1fr); }
  .advantages-grid{ grid-template-columns: repeat(2, 1fr); }
  .contact-grid{ grid-template-columns: 1fr; }
}

@media (max-width: 720px){
  .main-nav{
    position:absolute; top:92px; left:0; right:0;
    flex-direction:column; background: rgba(5,7,15,0.98);
    border-bottom: 1px solid var(--panel-border);
    padding: 16px 24px; gap: 14px;
    display:none;
  }
  .main-nav.open{ display:flex; }
  .nav-toggle{ display:flex; }
  .header-cta{ margin-left:auto; }
  .method-grid{ grid-template-columns: 1fr; }
  .form-row-split{ grid-template-columns: 1fr; }
}

@media (max-width: 560px){
  .coin-grid{ grid-template-columns: 1fr 1fr; }
  .steps-grid{ grid-template-columns: 1fr; }
  .advantages-grid{ grid-template-columns: 1fr; }
  .header-cta span{ display:none; }

  .hero-orbit{ max-width: 300px; }
  .coin{ width: 30px !important; height: 30px !important; }
  .coin-a, .coin-c, .coin-e{ width: 34px !important; height: 34px !important; }
  .orbit-center-text{ font-size: 1.1rem; }
}