/* styles.css — Mobile-first responsive styles for SteppiFi
   Clean fintech-style UI with neutral palette and single accent color.
*/

:root{
  --bg: #ffffff;
  --bg-end: #ffffff;
  --card: #ffffff;
  --muted: #6b7280; /* gray-500 */
  --text: #0b1220; /* very dark */
  --accent: #0d9488; /* teal */
  --accent-600: #0b7b72;
  --radius: 12px;
  --shadow: 0 8px 28px rgba(10, 15, 20, 0.06);
  --max-width: 1080px;
}

/* Dark theme variables — applied when user chooses dark or OS prefers dark */
:root[data-theme="dark"]{
  --bg: #0b1220;
  --bg-end: #0b1220;
  --card: #0f1724;
  --muted: #94a3b8;
  --text: #e6eef6;
  --accent: #34d399; /* green-400 */
  --accent-600: #10b981;
  --shadow: 0 10px 30px rgba(2,6,23,0.6);
}

@media (prefers-color-scheme: dark){
  :root:not([data-theme="light"]) {
    --bg: #0b1220;
    --card: #0f1724;
    --muted: #94a3b8;
    --text: #e6eef6;
    --accent: #34d399;
    --accent-600: #10b981;
    --shadow: 0 10px 30px rgba(2,6,23,0.6);
  }
}

/* Ensure light theme explicitly uses white backgrounds */
:root:not([data-theme="dark"]) {
  --bg: #ffffff;
  --bg-end: #ffffff;
  --card: #ffffff;
  --text: #0b1220;
  --muted: #6b7280;
}

/* Base reset */
*{box-sizing:border-box}
html,body{height:100%}
html{background:var(--bg);transition:background .25s ease}
body{
  margin:0;
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "Helvetica Neue", Arial;
  color:var(--text);
  background:linear-gradient(180deg,var(--bg),var(--bg-end) 120%);
  -webkit-font-smoothing:antialiased;
  -moz-osx-font-smoothing:grayscale;
  line-height:1.5;
  transition:background .25s ease,color .18s ease;
}

/* Theme transition overlay (expanding circle from toggle) */
.theme-overlay{
  position:fixed;left:0;top:0;border-radius:50%;pointer-events:none;z-index:9999;transform:translate(-50%,-50%) scale(0);transition:transform .45s cubic-bezier(.2,.9,.2,1),width .45s cubic-bezier(.2,.9,.2,1),height .45s cubic-bezier(.2,.9,.2,1);will-change:transform,width,height,opacity;background:var(--bg);}

.theme-animating *:not(.theme-overlay){transition:none !important}
.container{
  width:clamp(300px,92%,1200px);
  max-width:var(--max-width);
  margin:0 auto;
  padding:1.25rem;
}

/* Accessibility helper */
.sr-only{position:absolute;height:1px;width:1px;overflow:hidden;clip:rect(1px,1px,1px,1px);white-space:nowrap}

/* Header */
.site-header{background:transparent;padding:1rem 0}
.header-grid{display:flex;align-items:center;justify-content:space-between}
.brand .logo{margin:0;font-size:1.125rem;letter-spacing:0.4px}
.brand .tagline{margin:0;font-size:0.875rem;color:var(--muted)}
.nav a{margin-left:1rem;color:var(--muted);text-decoration:none;font-weight:600}
.nav a:hover{color:var(--text)}

.header-actions{display:flex;align-items:center;margin-left:0.75rem}
.theme-toggle{background:transparent;border:1px solid rgba(0,0,0,0.06);padding:0.4rem 0.6rem;border-radius:8px;cursor:pointer;font-size:1rem}
.theme-toggle:focus{outline:2px solid var(--accent);outline-offset:2px}

/* Hero */
.hero{display:grid;grid-template-columns:1fr;gap:1.25rem;align-items:center;padding-top:2rem;padding-bottom:2rem}
.hero-title{font-size:1.6rem;margin:0 0 0.5rem;color:var(--text);font-weight:800}
.hero-sub{color:var(--muted);margin:0 0 1rem}
.hero-ctas{display:flex;gap:0.75rem;flex-wrap:wrap}

.btn-primary{background:linear-gradient(180deg,var(--accent),var(--accent-600));color:#fff;border-color:transparent;box-shadow:0 10px 30px rgba(13, 121, 114, 0.12)}
.btn-ghost{background:transparent;color:var(--accent);border:1px solid rgba(13,148,136,0.12)}

.btn{background:transparent;border:1px solid transparent;padding:0.6rem 1rem;border-radius:10px;font-weight:700;cursor:pointer;transition:transform .18s ease, box-shadow .18s ease}
.btn:hover{transform:translateY(-3px)}
.btn:active{transform:translateY(0)}

.btn-primary{background:linear-gradient(180deg,var(--accent),var(--accent-600));color:#fff;border-color:transparent;box-shadow:0 6px 18px rgba(37,99,235,0.18)}
.btn-ghost{background:transparent;color:var(--accent);border:1px solid rgba(37,99,235,0.12)}

/* Visual card */
.hero-visual{display:flex;justify-content:center}
.mock-card{width:220px;border-radius:16px;background:var(--card);box-shadow:var(--shadow);padding:1rem;display:flex;flex-direction:column;align-items:flex-start}
.mock-card .card-top{font-size:2rem}
.mock-card .card-body{margin-top:0.5rem;color:var(--muted)}

/* About */
.about h3,.features h3,.how h3,.contact h3{margin-top:0;margin-bottom:0.75rem}
.muted{color:var(--muted)}
.mission-vision{display:grid;grid-template-columns:1fr;gap:0.75rem;margin-top:1rem}
.card.small{padding:1rem;border-radius:12px;background:var(--card);box-shadow:var(--shadow)}

/* Features */
.features-grid{display:grid;grid-template-columns:1fr;gap:0.75rem;margin-top:0.75rem}
.feature-card{display:flex;gap:0.75rem;align-items:flex-start;padding:1rem;border-radius:12px;background:var(--card);box-shadow:var(--shadow);transition:transform .2s ease}
.feature-card:hover{transform:translateY(-6px)}
.feature-card .icon{font-size:1.5rem}

/* How it works */
.steps{list-style:none;padding:0;margin:0;margin-top:0.75rem;display:grid;gap:0.75rem}
.step{display:flex;gap:0.75rem;align-items:flex-start;padding:1rem;border-radius:12px;background:var(--card);box-shadow:var(--shadow)}
.step-num{background:linear-gradient(180deg,var(--accent),var(--accent-600));color:white;width:44px;height:44px;border-radius:10px;display:flex;align-items:center;justify-content:center;font-weight:800}

/* Contact */
.contact-row{display:flex;gap:1rem;align-items:center;flex-wrap:wrap;margin-top:0.75rem}
.socials a{margin-left:0.5rem;text-decoration:none;font-size:1.25rem}

/* Non-action label for CTA state */
.coming-label{font-weight:700;color:var(--muted);padding:0.15rem 0.4rem;border-radius:8px;display:inline-block}

/* Footer */
.site-footer{padding:1.25rem 0;border-top:1px solid rgba(0,0,0,0.06);margin-top:2rem;background:transparent;transition:border-color .18s ease}

:root[data-theme="dark"] .site-footer{border-top-color:rgba(255,255,255,0.06)}
.footer-grid{display:flex;align-items:center;justify-content:space-between}
.footer-contact a{color:var(--muted);text-decoration:none}

/* Modal */
.modal{position:fixed;inset:0;display:flex;align-items:center;justify-content:center;background:rgba(7,9,15,0.45);opacity:0;pointer-events:none;transition:opacity .18s ease}
.modal[aria-hidden="false"]{opacity:1;pointer-events:auto}
.modal-panel{background:var(--card);padding:1.25rem;border-radius:14px;box-shadow:var(--shadow);max-width:480px;width:92%;position:relative}
.modal-close{position:absolute;right:0.6rem;top:0.6rem;background:transparent;border:none;font-size:1rem;cursor:pointer}

/* Responsive adjustments */
@media(min-width:720px){
  .hero{grid-template-columns:1fr 360px;padding-top:3.25rem;padding-bottom:3.25rem}
  .hero-title{font-size:2rem}
  .features-grid{grid-template-columns:repeat(2,1fr)}
  .mission-vision{grid-template-columns:repeat(2,1fr)}
  .steps{grid-template-columns:repeat(3,1fr)}
  .header-grid{padding:0}
}

@media(min-width:1100px){
  .container{padding:2rem}
}

/* small visual touches */
.card{transition:transform .18s ease, box-shadow .18s ease}

/* subtle entrance animations */
@keyframes fadeUp{from{opacity:0;transform:translateY(8px)}to{opacity:1;transform:none}}
.hero, .features, .how, .about, .contact{animation:fadeUp .55s ease both}