/* 3G Hub — landing + login. Dark OLED ops theme (design system: ui-ux-pro-max). */
:root {
  --bg: #020617;
  --surface: #0F172A;
  --surface-2: #1E293B;
  --border: #334155;
  --fg: #F8FAFC;
  --muted: #94A3B8;
  --accent: #22C55E;
  --accent-dim: rgba(34, 197, 94, .14);
  --danger: #EF4444;
  --mono: 'Fira Code', ui-monospace, monospace;
  --sans: 'Fira Sans', system-ui, sans-serif;
}

* { box-sizing: border-box; }

body {
  margin: 0;
  font: 400 16px/1.6 var(--sans);
  color: var(--fg);
  background:
    radial-gradient(60rem 32rem at 70% -10%, rgba(30, 58, 138, .35), transparent 60%),
    radial-gradient(40rem 24rem at 15% 110%, rgba(34, 197, 94, .10), transparent 60%),
    linear-gradient(rgba(148, 163, 184, .045) 1px, transparent 1px),
    linear-gradient(90deg, rgba(148, 163, 184, .045) 1px, transparent 1px),
    var(--bg);
  background-size: auto, auto, 3rem 3rem, 3rem 3rem, auto;
  min-height: 100dvh;
}

h1, h2, .brand, .pipe-line { font-family: var(--mono); }
a { color: var(--accent); }

/* --- nav ------------------------------------------------------------- */
.nav {
  display: flex; justify-content: space-between; align-items: center;
  max-width: 72rem; margin: 0 auto; padding: 1.25rem 1.5rem;
}
.brand { font-weight: 700; font-size: 1.25rem; letter-spacing: -.02em; }
.brand-accent { color: var(--accent); }

/* --- buttons ---------------------------------------------------------- */
.btn {
  display: inline-flex; align-items: center; justify-content: center;
  min-height: 48px; padding: .65rem 1.4rem; border-radius: .6rem;
  font: 600 1rem var(--sans); text-decoration: none; cursor: pointer;
  border: 1px solid transparent; transition: transform .15s ease, box-shadow .15s ease, background .15s ease;
}
.btn-sm { min-height: 44px; padding: .4rem 1.1rem; }
.btn-primary { background: var(--accent); color: #04160A; }
.btn-primary:hover { transform: translateY(-1px); box-shadow: 0 0 24px rgba(34, 197, 94, .35); }
.btn-ghost { border-color: var(--border); color: var(--fg); }
.btn-ghost:hover { background: var(--surface); }
:focus-visible { outline: 2px solid var(--accent); outline-offset: 3px; border-radius: .4rem; }

/* --- hero ------------------------------------------------------------- */
.hero { max-width: 72rem; margin: 0 auto; padding: 4.5rem 1.5rem 3.5rem; text-align: center; }
.badge {
  display: inline-flex; align-items: center; gap: .5rem;
  font: 500 .85rem var(--mono); color: var(--muted);
  border: 1px solid var(--border); border-radius: 99px; padding: .35rem 1rem;
  background: rgba(15, 23, 42, .6);
}
.dot {
  width: .5rem; height: .5rem; border-radius: 50%; background: var(--accent);
  box-shadow: 0 0 8px var(--accent); animation: pulse 2.4s ease-in-out infinite;
}
@keyframes pulse { 50% { opacity: .35; } }
h1 { font-size: clamp(2.1rem, 5.5vw, 3.6rem); line-height: 1.15; letter-spacing: -.03em; margin: 1.4rem 0 0; }
.hl {
  background: linear-gradient(90deg, var(--accent), #86EFAC);
  -webkit-background-clip: text; background-clip: text; color: transparent;
  text-shadow: 0 0 24px rgba(34, 197, 94, .25);
}
.sub { max-width: 42rem; margin: 1.25rem auto 0; color: var(--muted); font-size: 1.1rem; }
.cta-row { display: flex; gap: .9rem; justify-content: center; flex-wrap: wrap; margin-top: 2.2rem; }
.metrics {
  display: flex; gap: .75rem; justify-content: center; flex-wrap: wrap;
  list-style: none; padding: 0; margin: 3rem 0 0;
}
.metrics li {
  display: inline-flex; align-items: center; gap: .5rem;
  font: 500 .85rem var(--mono); color: var(--muted);
  background: var(--surface); border: 1px solid var(--border);
  border-radius: .5rem; padding: .5rem .9rem;
}

/* --- feature cards ------------------------------------------------------ */
.features {
  display: grid; grid-template-columns: repeat(auto-fit, minmax(19rem, 1fr));
  gap: 1.25rem; max-width: 60rem; margin: 0 auto; padding: 1rem 1.5rem;
  scroll-margin-top: 2rem;
}
.card {
  background: linear-gradient(180deg, var(--surface), rgba(15, 23, 42, .55));
  border: 1px solid var(--border); border-radius: 1rem; padding: 1.75rem;
  transition: transform .2s ease, border-color .2s ease;
}
.card:hover { transform: translateY(-3px); border-color: var(--accent); }
.card-icon {
  width: 2.9rem; height: 2.9rem; border-radius: .75rem;
  display: flex; align-items: center; justify-content: center;
  background: var(--accent-dim); color: var(--accent);
}
.card-icon svg { width: 1.5rem; height: 1.5rem; }
.card h2 { font-size: 1.35rem; margin: 1rem 0 .25rem; }
.card > p { color: var(--muted); margin: .25rem 0 .75rem; }
.card ul { margin: 0; padding: 0; list-style: none; }
.card li { padding: .4rem 0 .4rem 1.4rem; position: relative; color: var(--fg); }
.card li::before { content: '▸'; position: absolute; left: 0; color: var(--accent); }
.card-note {
  margin-top: 1rem; padding: .7rem .9rem; border-radius: .6rem;
  background: var(--accent-dim); border: 1px solid rgba(34, 197, 94, .3);
  font-size: .9rem; color: #BBF7D0;
}

/* --- pipeline ------------------------------------------------------------ */
.pipeline { max-width: 60rem; margin: 0 auto; padding: 3.5rem 1.5rem; text-align: center; }
.pipeline h2 { font-size: 1.6rem; letter-spacing: -.02em; }
.pipe-line { font-size: clamp(1rem, 3vw, 1.35rem); color: var(--fg); margin: 1.25rem 0; }
.pipe-line span { color: var(--accent); padding: 0 .5rem; }
.pipeline .sub { font-size: 1rem; }

/* --- footer --------------------------------------------------------------- */
.footer {
  display: flex; justify-content: space-between; gap: 1rem; flex-wrap: wrap;
  max-width: 72rem; margin: 2rem auto 0; padding: 1.5rem;
  border-top: 1px solid var(--border); color: var(--muted); font-size: .9rem;
}

/* --- login ------------------------------------------------------------------ */
.login-body { display: flex; align-items: center; justify-content: center; padding: 1.5rem; }
.login-card {
  width: 100%; max-width: 24rem; padding: 2.25rem;
  background: linear-gradient(180deg, var(--surface), rgba(15, 23, 42, .55));
  border: 1px solid var(--border); border-radius: 1rem;
}
.login-brand { font: 700 1.2rem var(--mono); color: var(--fg); text-decoration: none; }
.login-card h1 { font-size: 1.5rem; margin: 1.25rem 0 1rem; }
.login-card label { display: block; font: 500 .9rem var(--sans); color: var(--muted); margin: 1rem 0 .35rem; }
.login-card input {
  width: 100%; min-height: 48px; padding: .6rem .9rem; border-radius: .6rem;
  border: 1px solid var(--border); background: var(--bg); color: var(--fg);
  font: 400 1rem var(--sans);
}
.login-card input:focus { border-color: var(--accent); outline: none; }
.login-card form button {
  width: 100%; margin-top: 1.5rem;
  min-height: 48px; border: none; border-radius: .6rem; cursor: pointer;
  background: var(--accent); color: #04160A; font: 600 1rem var(--sans);
  transition: box-shadow .15s ease;
}
.login-card form button:hover { box-shadow: 0 0 24px rgba(34, 197, 94, .35); }
.login-error {
  padding: .7rem .9rem; border-radius: .6rem; font-size: .9rem;
  background: rgba(239, 68, 68, .12); border: 1px solid rgba(239, 68, 68, .4); color: #FECACA;
}
.login-hint { color: var(--muted); font-size: .85rem; margin-top: 1.25rem; text-align: center; }

/* --- entrance reveal ------------------------------------------------------------ */
.reveal { opacity: 0; transform: translateY(14px); animation: rise .6s ease-out forwards; }
.r1 { animation-delay: .05s; } .r2 { animation-delay: .15s; } .r3 { animation-delay: .25s; }
.r4 { animation-delay: .35s; } .r5 { animation-delay: .45s; }
@keyframes rise { to { opacity: 1; transform: none; } }

@media (prefers-reduced-motion: reduce) {
  .reveal { animation: none; opacity: 1; transform: none; }
  .dot { animation: none; }
  .btn, .card { transition: none; }
}

@media (max-width: 768px) {
  .hero { padding-top: 3rem; }
  .footer { justify-content: center; text-align: center; }
}