/* ============================================================
   Arc Power - website styles
   Palette mirrors the app: dark surfaces (#0f131f family) with
   the signature accent blue #4cc2ff.
   ============================================================ */

:root {
  --bg: #0a0d14;
  --bg-2: #0f131f;
  --surface: rgba(255, 255, 255, 0.035);
  --surface-2: #131a2b;
  --border: rgba(255, 255, 255, 0.09);
  --border-strong: rgba(76, 194, 255, 0.35);
  --accent: #4cc2ff;
  --accent-soft: rgba(76, 194, 255, 0.14);
  --accent-2: #8fd8ff;
  --text: #e8eef7;
  --muted: #93a0b4;
  --muted-2: #64748b;
  --ok: #34d399;
  --warn: #fbbf24;
  --est: #a78bfa;
  --danger: #f87171;
  --radius: 16px;
  --font: 'Inter', system-ui, -apple-system, 'Segoe UI', sans-serif;
  --mono: 'JetBrains Mono', ui-monospace, 'Cascadia Code', Consolas, monospace;
  --maxw: 1120px;
}

* { margin: 0; padding: 0; box-sizing: border-box; }

html { scroll-behavior: smooth; }

body {
  font-family: var(--font);
  background: var(--bg);
  color: var(--text);
  line-height: 1.6;
  overflow-x: hidden;
}

::selection { background: var(--accent); color: #06121c; }

a { color: var(--accent); text-decoration: none; }
a:hover { text-decoration: underline; }

.mono { font-family: var(--mono); }

.wrap { max-width: var(--maxw); margin: 0 auto; padding: 0 24px; }

.glass {
  background: linear-gradient(160deg, var(--surface), rgba(255,255,255,0.015));
  border: 1px solid var(--border);
  border-radius: var(--radius);
}

/* ---------- ambient background ---------- */
.bg-grid {
  position: fixed; inset: 0; z-index: -3; pointer-events: none;
  background-image:
    linear-gradient(rgba(76,194,255,0.035) 1px, transparent 1px),
    linear-gradient(90deg, rgba(76,194,255,0.035) 1px, transparent 1px);
  background-size: 44px 44px;
  mask-image: radial-gradient(ellipse 90% 60% at 50% 0%, black 30%, transparent 75%);
  -webkit-mask-image: radial-gradient(ellipse 90% 60% at 50% 0%, black 30%, transparent 75%);
}

.bg-glow {
  position: fixed; z-index: -2; pointer-events: none; border-radius: 50%;
  filter: blur(110px); opacity: 0.5;
}
.bg-glow-a { width: 640px; height: 640px; top: -220px; left: 50%; transform: translateX(-50%); background: radial-gradient(circle, rgba(76,194,255,0.22), transparent 65%); }
.bg-glow-b { width: 520px; height: 520px; bottom: -260px; right: -160px; background: radial-gradient(circle, rgba(76,194,255,0.10), transparent 65%); }

/* ---------- nav ---------- */
.nav {
  position: sticky; top: 0; z-index: 50;
  display: flex; align-items: center; gap: 24px;
  padding: 14px 24px; max-width: var(--maxw); margin: 0 auto;
  backdrop-filter: blur(14px);
  background: rgba(10, 13, 20, 0.72);
  border-bottom: 1px solid transparent;
}
.nav.scrolled { border-bottom-color: var(--border); }

.nav-brand { display: flex; align-items: center; gap: 10px; color: var(--text); }
.nav-brand:hover { text-decoration: none; }
.nav-logo { filter: drop-shadow(0 0 10px rgba(76,194,255,0.35)); }
.nav-name { font-weight: 800; font-size: 17px; letter-spacing: -0.02em; }
.nav-ver {
  font-size: 10.5px; color: var(--muted-2); border: 1px solid var(--border);
  padding: 2px 8px; border-radius: 999px; background: rgba(255,255,255,0.03);
}

.nav-links { display: flex; gap: 26px; margin-left: 8px; }
.nav-links a { color: var(--muted); font-size: 14px; font-weight: 500; transition: color 0.2s; }
.nav-links a:hover { color: var(--text); text-decoration: none; }

.nav-actions { margin-left: auto; display: flex; align-items: center; gap: 10px; }

/* ---------- mobile nav (hamburger; shown below 960px) ---------- */
.nav-burger {
  display: none;
  flex-direction: column; justify-content: center; gap: 4px;
  width: 40px; height: 40px; padding: 0;
  background: rgba(255,255,255,0.04); border: 1px solid var(--border);
  border-radius: 10px; cursor: pointer;
  -webkit-tap-highlight-color: transparent;
}
.nav-burger span {
  display: block; width: 18px; height: 2px; margin: 0 auto;
  border-radius: 2px; background: var(--text);
  transition: transform 0.25s, opacity 0.2s;
}
.nav-burger:hover { border-color: var(--border-strong); }

/* ---------- buttons ---------- */
.btn {
  display: inline-flex; align-items: center; gap: 8px;
  padding: 10px 20px; border-radius: 10px;
  font-weight: 600; font-size: 14.5px; line-height: 1.2;
  transition: transform 0.15s, box-shadow 0.2s, background 0.2s, border-color 0.2s;
  cursor: pointer;
}
.btn:hover { text-decoration: none; transform: translateY(-1px); }

.btn-primary {
  background: linear-gradient(135deg, var(--accent), #2ea3e6);
  color: #06121c; box-shadow: 0 6px 24px rgba(76,194,255,0.35);
}
.btn-primary:hover { box-shadow: 0 8px 32px rgba(76,194,255,0.5); }

.btn-ghost {
  background: rgba(255,255,255,0.04); color: var(--text);
  border: 1px solid var(--border);
}
.btn-ghost:hover { border-color: var(--border-strong); background: rgba(76,194,255,0.08); }

/* ---------- hero ---------- */
.hero {
  max-width: var(--maxw); margin: 0 auto; padding: 88px 24px 64px;
  display: grid; grid-template-columns: 1.05fr 0.95fr; gap: 64px; align-items: center;
}

.hero-badge {
  display: inline-flex; align-items: center; gap: 10px;
  font-size: 13px; font-weight: 600; color: var(--accent-2);
  background: var(--accent-soft); border: 1px solid rgba(76,194,255,0.25);
  padding: 7px 14px; border-radius: 999px; margin-bottom: 26px;
}

.pulse-dot {
  width: 8px; height: 8px; border-radius: 50%; background: var(--accent);
  box-shadow: 0 0 0 0 rgba(76,194,255,0.6);
  animation: pulse 2s infinite;
}
@keyframes pulse {
  0% { box-shadow: 0 0 0 0 rgba(76,194,255,0.55); }
  70% { box-shadow: 0 0 0 9px rgba(76,194,255,0); }
  100% { box-shadow: 0 0 0 0 rgba(76,194,255,0); }
}

.hero-title {
  font-size: clamp(52px, 7vw, 84px); font-weight: 800;
  letter-spacing: -0.04em; line-height: 1.02; margin-bottom: 22px;
}
.grad-text {
  background: linear-gradient(100deg, var(--accent) 10%, var(--accent-2) 55%, #7ee0ff 90%);
  -webkit-background-clip: text; background-clip: text; color: transparent;
  filter: drop-shadow(0 0 24px rgba(76,194,255,0.28));
}

.hero-sub { font-size: 17px; color: var(--muted); max-width: 520px; margin-bottom: 34px; }

.hero-actions { display: flex; flex-direction: column; align-items: flex-start; gap: 14px; margin-bottom: 30px; }
.hero-actions-row { display: flex; gap: 14px; flex-wrap: wrap; }

.hero-trust {
  display: flex; align-items: center; gap: 14px; flex-wrap: wrap;
  font-size: 12.5px; color: var(--muted-2);
}
.hero-trust i { width: 3px; height: 3px; border-radius: 50%; background: var(--muted-2); }

/* ---------- hero dashboard card ---------- */
.hero-card { padding: 24px; box-shadow: 0 30px 80px rgba(0,0,0,0.5); position: relative; overflow: hidden; }
.hero-card::before {
  content: ''; position: absolute; inset: 0; pointer-events: none;
  background: radial-gradient(600px 240px at 85% -10%, rgba(76,194,255,0.12), transparent 60%);
}

.card-head { display: flex; align-items: center; justify-content: space-between; margin-bottom: 20px; }
.card-head-left { display: flex; align-items: center; gap: 12px; }
.card-head-left img { filter: drop-shadow(0 0 8px rgba(76,194,255,0.4)); }
.card-title { font-weight: 700; font-size: 15.5px; }
.card-sub { font-size: 11.5px; color: var(--muted-2); }

.live-chip {
  display: inline-flex; align-items: center; gap: 7px;
  font-size: 11px; font-weight: 600; letter-spacing: 0.08em;
  color: var(--ok); background: rgba(52,211,153,0.1);
  border: 1px solid rgba(52,211,153,0.3);
  padding: 4px 10px; border-radius: 999px;
}
.live-chip .pulse-dot { background: var(--ok); box-shadow: none; animation-name: pulse-green; }
@keyframes pulse-green {
  0% { box-shadow: 0 0 0 0 rgba(52,211,153,0.55); }
  70% { box-shadow: 0 0 0 7px rgba(52,211,153,0); }
  100% { box-shadow: 0 0 0 0 rgba(52,211,153,0); }
}

.readouts { display: grid; grid-template-columns: repeat(3, 1fr); gap: 12px; margin-bottom: 20px; }
.readout {
  background: rgba(255,255,255,0.03); border: 1px solid var(--border);
  border-radius: 12px; padding: 12px 14px;
}
.readout-label { font-size: 10.5px; color: var(--muted-2); letter-spacing: 0.06em; text-transform: uppercase; margin-bottom: 4px; }
.readout-val { font-size: 20px; font-weight: 700; color: var(--text); }
.readout-val .unit { font-size: 11px; color: var(--muted-2); margin-left: 4px; font-weight: 500; }

.power-block { background: rgba(255,255,255,0.03); border: 1px solid var(--border); border-radius: 12px; padding: 14px; }
.power-meta { display: flex; justify-content: space-between; gap: 4px; font-size: 12px; color: var(--muted); margin-bottom: 8px; }
.power-meta .js-anim { margin-left: auto; color: var(--accent); font-weight: 600; }
.power-track { position: relative; height: 8px; border-radius: 999px; background: rgba(255,255,255,0.08); overflow: hidden; }
.power-marker {
  position: absolute; top: -3px; bottom: -3px; left: 50%; width: 2px;
  background: var(--danger); border-radius: 2px;
  box-shadow: 0 0 6px rgba(248,113,113,0.9);
  transition: left 1.2s cubic-bezier(0.22, 1, 0.36, 1);
}
.power-fill {
  height: 100%; width: 82%; border-radius: 999px;
  background: linear-gradient(90deg, #2ea3e6, var(--accent), #7ee0ff);
  box-shadow: 0 0 14px rgba(76,194,255,0.7);
  transition: width 1.4s cubic-bezier(0.22, 1, 0.36, 1);
}
.power-scale { position: relative; margin-top: 8px; height: 16px; font-size: 10.5px; color: var(--muted-2); }
.power-scale > span { position: absolute; top: 0; line-height: 1; }
.power-scale #powerMin { left: 0; }
.power-scale #powerMax { transform: translateX(-50%); }
.power-ext { color: var(--accent); font-weight: 600; right: 0; }

.card-foot { margin-top: 14px; font-size: 11.5px; color: var(--muted); display: flex; gap: 18px; }
.card-foot .ok { color: var(--ok); margin-right: 2px; }

/* ---------- stats ---------- */
.stats { display: grid; grid-template-columns: repeat(4, 1fr); gap: 16px; padding-bottom: 20px; }
.stat { padding: 22px 24px; text-align: center; }
.stat-num {
  font-size: 34px; font-weight: 700; color: var(--accent);
  background: linear-gradient(120deg, var(--accent), #7ee0ff);
  -webkit-background-clip: text; background-clip: text; color: transparent;
  margin-bottom: 4px; letter-spacing: -0.02em;
}
.stat-label { font-size: 13px; color: var(--muted); }

/* ---------- sections ---------- */
.section { padding: 84px 24px; }

.section-head { margin-bottom: 44px; }
.kicker {
  display: inline-block; font-size: 12px; font-weight: 700; letter-spacing: 0.16em;
  text-transform: uppercase; color: var(--accent); margin-bottom: 14px;
}
.section-head h2 {
  font-size: clamp(28px, 4vw, 40px); font-weight: 800; letter-spacing: -0.03em;
  line-height: 1.12; margin-bottom: 14px;
}
.section-sub { color: var(--muted); max-width: 640px; font-size: 15.5px; }

/* ---------- feature grid ---------- */
.feature-grid { display: grid; grid-template-columns: repeat(3, 1fr); gap: 18px; }

.card {
  padding: 28px; border-radius: var(--radius); position: relative; overflow: hidden;
  transition: transform 0.25s, border-color 0.25s, box-shadow 0.25s;
}
.card:hover {
  transform: translateY(-4px);
  border-color: var(--border-strong);
  box-shadow: 0 18px 50px rgba(0,0,0,0.45), 0 0 30px rgba(76,194,255,0.07);
}

.card-icon {
  width: 46px; height: 46px; border-radius: 12px; display: grid; place-items: center;
  background: var(--accent-soft); border: 1px solid rgba(76,194,255,0.25);
  color: var(--accent); margin-bottom: 18px;
}
.card-icon svg { width: 22px; height: 22px; }

.card h3 { font-size: 17px; font-weight: 700; margin-bottom: 10px; letter-spacing: -0.01em; }
.card p { font-size: 14.5px; color: var(--muted); }
.card p strong { color: var(--text); font-weight: 600; }

/* ---------- GPU table ---------- */
.gpu-table { overflow: hidden; }
.gpu-row {
  display: grid; grid-template-columns: 1.4fr 1fr 1.6fr; gap: 16px; align-items: center;
  padding: 18px 26px; border-bottom: 1px solid var(--border);
}
.gpu-row:last-child { border-bottom: none; }
.gpu-row:not(.gpu-head) { transition: background 0.2s; }
.gpu-row:not(.gpu-head):hover { background: rgba(76,194,255,0.05); }

.gpu-head { font-size: 11.5px; text-transform: uppercase; letter-spacing: 0.12em; color: var(--muted-2); background: rgba(255,255,255,0.025); }
.gpu-name { display: flex; align-items: center; gap: 10px; font-weight: 600; font-size: 15px; }
.gpu-name img { opacity: 0.9; filter: drop-shadow(0 0 6px rgba(76,194,255,0.35)); }

.chip {
  justify-self: start; display: inline-flex; flex-direction: column; gap: 2px;
  font-size: 12.5px; font-weight: 700; padding: 5px 12px; border-radius: 999px;
}
.chip-sub { font-size: 10.5px; font-weight: 500; opacity: 0.75; }
.chip-ok  { color: var(--ok);  background: rgba(52,211,153,0.1);  border: 1px solid rgba(52,211,153,0.3); }
.chip-warn{ color: var(--warn); background: rgba(251,191,36,0.1);  border: 1px solid rgba(251,191,36,0.3); }
.chip-est { color: var(--est); background: rgba(167,139,250,0.1); border: 1px solid rgba(167,139,250,0.3); }

.gpu-note { margin-top: 18px; font-size: 13.5px; color: var(--muted-2); }
.gpu-note strong { color: var(--text); }

/* ---------- safety ---------- */
.safety-grid { display: grid; grid-template-columns: repeat(3, 1fr); gap: 18px; }
.card-num {
  font-family: var(--mono); font-size: 13px; font-weight: 700; color: var(--accent);
  opacity: 0.85; margin-bottom: 16px; letter-spacing: 0.1em;
}

/* ---------- requirements ---------- */
.req-grid { display: grid; grid-template-columns: repeat(3, 1fr); gap: 18px; }
.req {
  display: flex; gap: 16px; align-items: flex-start;
  padding: 24px; border-radius: var(--radius);
}
.req svg { width: 26px; height: 26px; color: var(--accent); flex-shrink: 0; margin-top: 2px; }
.req h3 { font-size: 15.5px; font-weight: 700; margin-bottom: 6px; }
.req p { font-size: 13.5px; color: var(--muted); }

/* ---------- footer ---------- */
.footer { border-top: 1px solid var(--border); background: rgba(7, 10, 16, 0.6); margin-top: 40px; }
.footer-inner {
  display: flex; align-items: center; justify-content: space-between;
  gap: 24px; padding-top: 44px; padding-bottom: 30px; flex-wrap: wrap;
}
.footer-brand { display: flex; align-items: center; gap: 14px; }
.footer-brand img { filter: drop-shadow(0 0 12px rgba(76,194,255,0.35)); }
.footer-name { font-weight: 800; font-size: 17px; }
.footer-tag { font-size: 12.5px; color: var(--muted-2); }
.footer-links { display: flex; gap: 22px; font-size: 13.5px; flex-wrap: wrap; }
.footer-legal { padding-top: 22px; padding-bottom: 44px; border-top: 1px solid var(--border); }
.footer-legal p { font-size: 12.5px; color: var(--muted-2); margin-bottom: 8px; max-width: 760px; }
.footer-legal a { color: var(--muted); }
.footer-legal a:hover { color: var(--accent); }

/* ---------- scroll reveal ---------- */
.reveal { opacity: 0; transform: translateY(22px); transition: opacity 0.6s ease, transform 0.6s ease; }
.reveal.visible { opacity: 1; transform: none; }

/* ---------- responsive ---------- */
@media (max-width: 960px) {
  .hero { grid-template-columns: 1fr; gap: 48px; padding-top: 64px; }
  .hero-text { text-align: center; }
  .hero-sub { margin-left: auto; margin-right: auto; }
  .hero-actions, .hero-actions-row, .hero-trust { justify-content: center; }
  .hero-actions { align-items: center; }
  .feature-grid, .safety-grid, .req-grid { grid-template-columns: 1fr; }
  .stats { grid-template-columns: repeat(2, 1fr); }

  .nav-burger { display: flex; margin-left: auto; }
  .nav-actions { margin-left: 0; }
  .nav-links {
    display: none;
    position: absolute; top: calc(100% + 8px); left: 12px; right: 12px;
    flex-direction: column; gap: 4px; padding: 10px;
    background: rgba(10, 13, 20, 0.97); border: 1px solid var(--border);
    border-radius: 14px; backdrop-filter: blur(16px);
    box-shadow: 0 24px 60px rgba(0,0,0,0.55);
  }
  .nav.open .nav-links { display: flex; }
  .nav-links a { padding: 13px 14px; border-radius: 10px; font-size: 15px; }
  .nav-links a:hover { background: var(--accent-soft); }
}

@media (max-width: 560px) {
  .stats { grid-template-columns: 1fr 1fr; gap: 12px; }
  .readouts { grid-template-columns: repeat(2, 1fr); }
  .gpu-row { grid-template-columns: 1fr; gap: 6px; padding: 16px 20px; }
  .gpu-head { display: none; }
  .hero { padding-top: 48px; }
}

/* ---------- mobile mode (auto-detected: coarse pointer or narrow screen) ---------- */
html.mobile .hero { padding: 40px 20px 48px; }
html.mobile .hero-title { font-size: clamp(42px, 11vw, 84px); }
html.mobile .section { padding: 56px 20px; }
html.mobile .section-head { margin-bottom: 30px; }
html.mobile .card { padding: 22px 20px; }
html.mobile .stat { padding: 18px 14px; }
html.mobile .stat-num { font-size: 28px; }
html.mobile .readout { padding: 10px 12px; }
html.mobile .readout-val { font-size: 18px; }
html.mobile .power-scale { height: auto; }
html.mobile .power-scale #powerMax { font-size: 10px; }
html.mobile .power-ext { position: static; display: block; text-align: right; margin-top: 6px; }
html.mobile .gpu-row { padding: 14px 18px; }
html.mobile .btn { padding: 12px 18px; }
html.mobile .nav { padding: 12px 16px; }
html.mobile .nav-actions .btn { padding: 10px 12px; }
html.mobile .nav-actions span { display: none; }

/* touch devices: no hover lifts, no tap flash */
@media (hover: none) {
  .card:hover { transform: none; box-shadow: none; }
  .btn:hover { transform: none; }
  .gpu-row:not(.gpu-head):hover { background: none; }
}
html.mobile { -webkit-tap-highlight-color: transparent; }