/* ============================================================
   NetSweep — Personal Wi-Fi Diagnostics
   Design language: "quiet instrument" — deep night canvas,
   mint-teal pulse glow, soft glass surfaces, monospace telemetry.
   The motif is a heartbeat/pulse (diagnostics), not a radar
   sweep (scanner).
   ============================================================ */

@import url('https://fonts.googleapis.com/css2?family=Space+Grotesk:wght@400;500;600;700&family=JetBrains+Mono:wght@400;500;700&display=swap');

:root {
  --canvas-top: #070b12;
  --canvas-bottom: #0c1220;
  --surface: #10161f;
  --surface-hi: #161e2a;
  --accent: #53d6c6;          /* pulse mint-teal */
  --accent-deep: #2ba99b;
  --good: #6ee7a8;
  --amber: #f5c469;
  --danger: #f87f7f;
  --info: #7aa7ff;
  --purple: #b495f7;
  --text: #edf2f7;
  --text-dim: #8d97a8;
  --text-faint: #5b6577;
  --stroke: rgba(255,255,255,0.07);
  --card-glow: rgba(255,255,255,0.14);
  --nav-bg: rgba(7,11,18,0.72);
  --display: 'Space Grotesk', sans-serif;
  --mono: 'JetBrains Mono', monospace;
  --maxw: 1140px;
  --radius: 20px;
}

/* Light theme — "morning kitchen table": warm paper, deep teal */
[data-theme="light"] {
  --canvas-top: #f5f7fa;
  --canvas-bottom: #eaeef4;
  --surface: #ffffff;
  --surface-hi: #eef2f7;
  --accent: #0e8d80;
  --accent-deep: #0a6e64;
  --good: #1f9d63;
  --amber: #b07f1c;
  --danger: #c94848;
  --info: #2f63c4;
  --purple: #7c54c9;
  --text: #141a23;
  --text-dim: #57606e;
  --text-faint: #97a0ad;
  --stroke: rgba(10,15,25,0.10);
  --card-glow: rgba(10,15,25,0.05);
  --nav-bg: rgba(245,247,250,0.78);
}

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

html { scroll-behavior: smooth; }

body {
  font-family: var(--display);
  background: var(--canvas-top);
  color: var(--text);
  line-height: 1.6;
  -webkit-font-smoothing: antialiased;
  overflow-x: hidden;
  transition: background 0.5s ease, color 0.5s ease;
}

/* Atmosphere: gradient blooms + faint blueprint grid */
body::before {
  content: '';
  position: fixed;
  inset: 0;
  background:
    radial-gradient(ellipse 75% 50% at 50% -8%, color-mix(in srgb, var(--accent) 13%, transparent), transparent 60%),
    radial-gradient(ellipse 55% 45% at 88% 100%, color-mix(in srgb, var(--info) 9%, transparent), transparent 55%),
    radial-gradient(ellipse 40% 35% at 5% 70%, color-mix(in srgb, var(--purple) 6%, transparent), transparent 60%),
    linear-gradient(180deg, var(--canvas-top), var(--canvas-bottom));
  z-index: -2;
  transition: background 0.5s ease;
}
body::after {
  content: '';
  position: fixed;
  inset: 0;
  background-image:
    linear-gradient(var(--stroke) 1px, transparent 1px),
    linear-gradient(90deg, var(--stroke) 1px, transparent 1px);
  background-size: 52px 52px;
  mask-image: radial-gradient(ellipse 90% 70% at 50% 25%, #000 25%, transparent 75%);
  opacity: 0.45;
  z-index: -1;
}

/* ---------- Layout ---------- */
.wrap { max-width: var(--maxw); margin: 0 auto; padding: 0 24px; }
section.wrap { padding: 96px 24px; max-width: var(--maxw); margin: 0 auto; position: relative; }

.eyebrow {
  font-family: var(--mono);
  font-size: 0.78rem;
  letter-spacing: 0.22em;
  text-transform: uppercase;
  color: var(--accent);
  margin-bottom: 18px;
  display: inline-flex;
  align-items: center;
  gap: 10px;
}
.eyebrow::before {
  content: '';
  width: 22px; height: 1px;
  background: var(--accent);
}

h1, h2, h3 { font-weight: 700; line-height: 1.1; letter-spacing: -0.025em; }
h1 { font-size: clamp(2.6rem, 6vw, 4.4rem); }
h2 { font-size: clamp(1.9rem, 4vw, 2.9rem); margin-bottom: 18px; }
h3 { font-size: 1.28rem; }
p { color: var(--text-dim); }
.lead { font-size: 1.18rem; color: var(--text-dim); max-width: 640px; }

.gradient-text {
  background: linear-gradient(115deg, var(--accent), var(--info));
  -webkit-background-clip: text; background-clip: text;
  -webkit-text-fill-color: transparent;
}

/* ---------- Nav ---------- */
nav {
  position: sticky; top: 0; z-index: 100;
  backdrop-filter: blur(16px);
  background: var(--nav-bg);
  border-bottom: 1px solid var(--stroke);
  transition: background 0.5s ease;
}
.nav-inner {
  max-width: var(--maxw); margin: 0 auto; padding: 15px 24px;
  display: flex; align-items: center; justify-content: space-between;
}
.brand { display: flex; align-items: center; gap: 11px; font-weight: 700; font-size: 1.15rem; letter-spacing: -0.01em; text-decoration: none; color: var(--text); }
.brand .mark { width: 30px; height: 30px; }
.brand .mark .pulse-core { filter: drop-shadow(0 0 6px var(--accent)); }
.nav-links { display: flex; gap: 28px; align-items: center; }
.nav-links a { color: var(--text-dim); text-decoration: none; font-size: 0.95rem; transition: color 0.2s; }
.nav-links a:hover, .nav-links a.active { color: var(--text); }
.nav-links a.cta {
  color: var(--canvas-top); background: var(--accent);
  padding: 9px 18px; border-radius: 11px; font-weight: 600;
  box-shadow: 0 6px 20px color-mix(in srgb, var(--accent) 28%, transparent);
  transition: transform 0.2s, box-shadow 0.2s;
}
.nav-links a.cta:hover { transform: translateY(-2px); box-shadow: 0 10px 28px color-mix(in srgb, var(--accent) 38%, transparent); color: var(--canvas-top); }
.nav-toggle { display: none; background: none; border: none; color: var(--text); font-size: 1.5rem; cursor: pointer; }

/* ---------- Theme toggle ---------- */
.theme-toggle {
  background: var(--surface);
  border: 1px solid var(--stroke);
  width: 38px; height: 38px;
  border-radius: 11px;
  display: grid; place-items: center;
  cursor: pointer;
  color: var(--text-dim);
  transition: color 0.2s, border-color 0.2s, transform 0.2s, background 0.5s;
  position: relative;
  overflow: hidden;
}
.theme-toggle:hover { color: var(--accent); border-color: var(--accent); transform: translateY(-1px); }
.theme-toggle svg { width: 18px; height: 18px; transition: opacity 0.3s, transform 0.4s; position: absolute; }
.theme-toggle .icon-sun { opacity: 0; transform: rotate(-90deg) scale(0.5); }
.theme-toggle .icon-moon { opacity: 1; transform: rotate(0) scale(1); }
[data-theme="light"] .theme-toggle .icon-sun { opacity: 1; transform: rotate(0) scale(1); }
[data-theme="light"] .theme-toggle .icon-moon { opacity: 0; transform: rotate(90deg) scale(0.5); }

/* ---------- Hero ---------- */
.hero { padding: 88px 0 56px; text-align: center; }
.hero h1 { margin-bottom: 24px; }
.hero .lead { margin: 0 auto 36px; }
.hero-actions { display: flex; gap: 16px; justify-content: center; flex-wrap: wrap; }

.btn {
  font-family: var(--display); font-weight: 600; font-size: 1rem;
  padding: 14px 28px; border-radius: 13px; text-decoration: none;
  cursor: pointer; border: none;
  transition: transform 0.2s, box-shadow 0.2s, background 0.2s, border-color 0.2s;
  display: inline-flex; align-items: center; gap: 9px;
}
.btn-primary {
  background: var(--accent); color: var(--canvas-top);
  box-shadow: 0 8px 24px color-mix(in srgb, var(--accent) 30%, transparent);
  position: relative; overflow: hidden;
}
.btn-primary:hover { transform: translateY(-2px); box-shadow: 0 12px 32px color-mix(in srgb, var(--accent) 42%, transparent); }
.btn-primary::after {
  content: '';
  position: absolute; top: 0; left: -120%;
  width: 60%; height: 100%;
  background: linear-gradient(100deg, transparent, rgba(255,255,255,0.35), transparent);
  transform: skewX(-20deg);
  transition: left 0.6s cubic-bezier(0.2,0.8,0.2,1);
}
.btn-primary:hover::after { left: 130%; }
.btn-ghost { background: var(--surface); color: var(--text); border: 1px solid var(--stroke); }
.btn-ghost:hover { transform: translateY(-2px); border-color: var(--accent); }

/* ---------- Pulse hero visual ----------
   Concentric "home" rings with expanding pulse waves and
   device nodes that light up — a diagnostic heartbeat, not a sweep. */
.pulse-viz {
  width: min(440px, 80vw); aspect-ratio: 1;
  margin: 52px auto 0; position: relative;
}
.pulse-viz svg { width: 100%; height: 100%; overflow: visible; }
.pulse-viz .ring { fill: none; stroke: var(--accent); opacity: 0.28; stroke-width: 1.2; }
.pulse-viz .ring.outer { opacity: 0.5; stroke-width: 1.6; }
.pulse-viz .spoke { stroke: var(--accent); opacity: 0.14; stroke-width: 1; }
.pulse-viz .core {
  fill: var(--accent);
  filter: drop-shadow(0 0 16px var(--accent));
  transform-box: fill-box; transform-origin: center;
  animation: corePulse 2.6s ease-in-out infinite;
}
.pulse-viz .wave {
  fill: none; stroke: var(--accent); stroke-width: 1.6;
  transform-box: fill-box; transform-origin: center;
  animation: wave 4.2s cubic-bezier(0.2,0.6,0.4,1) infinite;
  opacity: 0;
}
.pulse-viz .wave.w2 { animation-delay: 1.4s; }
.pulse-viz .wave.w3 { animation-delay: 2.8s; }
.pulse-viz .node { fill: var(--info); opacity: 0.35; animation: nodeGlow 4.2s ease-in-out infinite; }
.pulse-viz .node.n2 { animation-delay: 0.5s; fill: var(--good); }
.pulse-viz .node.n3 { animation-delay: 1.1s; fill: var(--amber); }
.pulse-viz .node.n4 { animation-delay: 1.7s; }
.pulse-viz .node.n5 { animation-delay: 2.3s; fill: var(--purple); }
.pulse-viz .node-label {
  font-family: var(--mono); font-size: 7.5px; fill: var(--text-faint);
  letter-spacing: 0.08em;
}

@keyframes corePulse { 0%,100% { opacity: 0.85; transform: scale(1); } 50% { opacity: 1; transform: scale(1.07); } }
@keyframes wave { 0% { transform: scale(0.08); opacity: 0.6; } 70% { opacity: 0.18; } 100% { transform: scale(1); opacity: 0; } }
@keyframes nodeGlow { 0%, 25%, 100% { opacity: 0.35; } 35% { opacity: 1; filter: drop-shadow(0 0 8px currentColor); } 55% { opacity: 0.35; } }

/* ---------- Badges / pills ---------- */
.pill {
  display: inline-flex; align-items: center; gap: 7px;
  font-family: var(--mono); font-size: 0.74rem; letter-spacing: 0.08em;
  padding: 6px 13px; border-radius: 999px;
  background: color-mix(in srgb, var(--accent) 10%, transparent);
  color: var(--accent);
  border: 1px solid color-mix(in srgb, var(--accent) 22%, transparent);
}
.pill.dot::before { content: ''; width: 6px; height: 6px; border-radius: 50%; background: var(--good); box-shadow: 0 0 8px var(--good); }

/* ---------- Cards & grids ---------- */
.grid { display: grid; gap: 22px; }
.grid-3 { grid-template-columns: repeat(3, 1fr); }
.grid-2 { grid-template-columns: repeat(2, 1fr); }

.card {
  background: var(--surface);
  border: 1px solid var(--stroke);
  border-radius: var(--radius);
  padding: 28px;
  position: relative;
  overflow: hidden;
  transition: transform 0.35s cubic-bezier(0.2,0.8,0.2,1), border-color 0.35s, box-shadow 0.35s;
}
.card::before {
  content: '';
  position: absolute; top: 0; left: 0; right: 0; height: 1px;
  background: linear-gradient(90deg, transparent, var(--card-glow), transparent);
}
.card:hover {
  transform: translateY(-4px);
  border-color: color-mix(in srgb, var(--accent) 30%, transparent);
  box-shadow: 0 18px 50px -20px color-mix(in srgb, var(--accent) 35%, transparent);
}
.card .ic {
  width: 46px; height: 46px; border-radius: 13px;
  background: color-mix(in srgb, var(--accent) 12%, transparent);
  color: var(--accent);
  display: grid; place-items: center; margin-bottom: 18px;
  font-size: 1.35rem;
  transition: transform 0.35s cubic-bezier(0.2,0.8,0.2,1), box-shadow 0.35s;
}
.card:hover .ic {
  transform: scale(1.06);
  box-shadow: 0 0 24px -4px color-mix(in srgb, var(--accent) 50%, transparent);
}
.card h3 { margin-bottom: 9px; }
.card p { font-size: 0.96rem; }

/* ---------- Tool chips (mirrors the in-app tool canvas) ---------- */
.tools-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 16px;
}
.tool-chip {
  display: flex; align-items: center; gap: 14px;
  background: var(--surface);
  border: 1px solid var(--stroke);
  border-radius: 16px;
  padding: 16px 18px;
  transition: transform 0.3s cubic-bezier(0.2,0.8,0.2,1), border-color 0.3s, box-shadow 0.3s;
}
.tool-chip:hover {
  transform: translateY(-3px);
  border-color: color-mix(in srgb, var(--chip, var(--accent)) 45%, transparent);
  box-shadow: 0 14px 36px -16px color-mix(in srgb, var(--chip, var(--accent)) 45%, transparent);
}
.tool-chip .glyph {
  flex: none;
  width: 42px; height: 42px; border-radius: 12px;
  display: grid; place-items: center;
  font-family: var(--mono); font-size: 1.15rem; font-weight: 700;
  background: color-mix(in srgb, var(--chip, var(--accent)) 13%, transparent);
  color: var(--chip, var(--accent));
}
.tool-chip .t-name { font-weight: 600; font-size: 0.98rem; line-height: 1.3; }
.tool-chip .t-sub { font-family: var(--mono); font-size: 0.72rem; color: var(--text-faint); letter-spacing: 0.06em; text-transform: lowercase; }
.tool-chip.is-teal   { --chip: var(--accent); }
.tool-chip.is-amber  { --chip: var(--amber); }
.tool-chip.is-info   { --chip: var(--info); }
.tool-chip.is-good   { --chip: var(--good); }
.tool-chip.is-purple { --chip: var(--purple); }
.tool-chip.is-danger { --chip: var(--danger); }

/* ---------- Scope guard band ---------- */
.guard {
  background: linear-gradient(180deg,
    color-mix(in srgb, var(--accent) 6%, var(--surface)),
    var(--surface));
  border: 1px solid color-mix(in srgb, var(--accent) 22%, transparent);
  border-radius: calc(var(--radius) + 6px);
  padding: 48px;
  position: relative;
  overflow: hidden;
}
.guard::before {
  content: '';
  position: absolute; top: 0; left: 0; right: 0; height: 2px;
  background: linear-gradient(90deg, transparent, var(--accent), transparent);
  opacity: 0.6;
}
.guard-steps { display: grid; grid-template-columns: repeat(3, 1fr); gap: 22px; margin-top: 36px; }
.guard-step {
  background: var(--surface-hi);
  border: 1px solid var(--stroke);
  border-radius: 16px;
  padding: 24px;
}
.guard-step .step-num {
  font-family: var(--mono); font-size: 0.74rem; letter-spacing: 0.18em;
  color: var(--accent); margin-bottom: 12px; display: block;
}
.guard-step h3 { font-size: 1.08rem; margin-bottom: 8px; }
.guard-step p { font-size: 0.92rem; }

/* ---------- Telemetry mock (terminal-style readout) ---------- */
.mock {
  font-family: var(--mono); font-size: 0.82rem; line-height: 1.9;
}
.mock .row { display: flex; justify-content: space-between; gap: 16px; padding: 6px 0; border-bottom: 1px solid var(--stroke); }
.mock .row:last-child { border: none; }
.mock .k { color: var(--text-dim); }
.mock .v { color: var(--accent); text-align: right; }
.mock .v.warn { color: var(--amber); }
.mock .v.bad { color: var(--danger); }
.mock .v.ok { color: var(--good); }
.mock .v.dim { color: var(--text-faint); }

/* ---------- Section header ---------- */
.sec-head { max-width: 660px; margin-bottom: 50px; }
.sec-head.center { margin-left: auto; margin-right: auto; text-align: center; }
.sec-head[data-num]::before {
  content: attr(data-num);
  font-family: var(--mono);
  font-size: 0.8rem;
  color: var(--text-faint);
  letter-spacing: 0.2em;
  display: block;
  margin-bottom: 12px;
}

/* ---------- Use-case rows ---------- */
.usecase {
  display: grid; grid-template-columns: 1fr 1fr; gap: 48px; align-items: center;
  margin-bottom: 90px;
}
.usecase:last-child { margin-bottom: 0; }
.usecase:nth-child(even) .uc-visual { order: -1; }
.uc-visual {
  background: var(--surface); border: 1px solid var(--stroke);
  border-radius: var(--radius); padding: 32px; min-height: 280px;
  display: flex; flex-direction: column; gap: 14px; justify-content: center;
  position: relative; overflow: hidden;
}
.uc-visual::before {
  content: '';
  position: absolute; top: 0; left: 0; right: 0; height: 1px;
  background: linear-gradient(90deg, transparent, var(--card-glow), transparent);
}
.uc-tag { font-family: var(--mono); font-size: 0.75rem; letter-spacing: 0.15em; text-transform: uppercase; color: var(--accent); }
.uc-list { list-style: none; margin-top: 18px; }
.uc-list li { padding: 11px 0 11px 28px; position: relative; color: var(--text-dim); border-bottom: 1px solid var(--stroke); }
.uc-list li:last-child { border-bottom: none; }
.uc-list li::before {
  content: '›'; position: absolute; left: 6px; color: var(--accent); font-family: var(--mono); font-weight: 700;
}

/* ---------- Stat band ---------- */
.stats { display: grid; grid-template-columns: repeat(4, 1fr); gap: 20px; text-align: center; }
.stat .num {
  font-family: var(--mono); font-size: 2.4rem; font-weight: 700;
  background: linear-gradient(135deg, var(--accent), var(--info));
  -webkit-background-clip: text; background-clip: text;
  -webkit-text-fill-color: transparent;
}
.stat .lbl { font-size: 0.85rem; color: var(--text-dim); margin-top: 6px; }

/* ---------- Prose (privacy) ---------- */
.prose { max-width: 760px; margin: 0 auto; }
.prose h2 { margin-top: 48px; font-size: 1.7rem; }
.prose h3 { margin-top: 30px; color: var(--accent); font-size: 1.15rem; }
.prose p, .prose li { color: var(--text-dim); margin-bottom: 14px; }
.prose ul { margin: 0 0 16px 22px; }
.prose li { margin-bottom: 8px; }
.prose strong { color: var(--text); }
.prose a { color: var(--accent); }
.prose .updated { font-family: var(--mono); font-size: 0.85rem; color: var(--text-faint); }

.callout {
  background: var(--surface); border: 1px solid var(--stroke);
  border-left: 3px solid var(--accent); border-radius: 13px;
  padding: 20px 24px; margin: 24px 0;
}
.callout p { margin: 0; color: var(--text); }

/* ---------- Footer ---------- */
footer { border-top: 1px solid var(--stroke); padding: 50px 0 40px; margin-top: 40px; }
.foot-inner { display: flex; justify-content: space-between; align-items: flex-start; flex-wrap: wrap; gap: 30px; }
.foot-links { display: flex; gap: 40px; flex-wrap: wrap; }
.foot-col h4 { font-size: 0.8rem; text-transform: uppercase; letter-spacing: 0.12em; color: var(--text-faint); margin-bottom: 14px; font-weight: 600; }
.foot-col a { display: block; color: var(--text-dim); text-decoration: none; font-size: 0.92rem; margin-bottom: 9px; transition: color 0.2s; }
.foot-col a:hover { color: var(--accent); }
.foot-bottom { margin-top: 40px; padding-top: 24px; border-top: 1px solid var(--stroke); font-size: 0.85rem; color: var(--text-faint); display: flex; justify-content: space-between; flex-wrap: wrap; gap: 12px; }

/* ---------- Reveal animation ---------- */
.reveal { opacity: 0; transform: translateY(24px); transition: opacity 0.7s cubic-bezier(0.2,0.8,0.2,1), transform 0.7s cubic-bezier(0.2,0.8,0.2,1); }
.reveal.in { opacity: 1; transform: none; }
.reveal.in .eyebrow::before { animation: lineGrow 0.6s cubic-bezier(0.2,0.8,0.2,1) both; }
@keyframes lineGrow { from { width: 0; opacity: 0; } to { width: 22px; opacity: 1; } }

/* ---------- Accessibility ---------- */
a:focus-visible, button:focus-visible, .btn:focus-visible {
  outline: 2px solid var(--accent);
  outline-offset: 3px;
  border-radius: 8px;
}

@media (prefers-reduced-motion: reduce) {
  *, *::before, *::after {
    animation-duration: 0.001ms !important;
    animation-iteration-count: 1 !important;
    transition-duration: 0.01ms !important;
    scroll-behavior: auto !important;
  }
  .pulse-viz .wave, .pulse-viz .core, .pulse-viz .node { animation: none !important; }
  .pulse-viz .wave { opacity: 0; }
  .reveal { opacity: 1 !important; transform: none !important; }
}

/* Light-mode glow tuning */
[data-theme="light"] .pulse-viz .core { filter: drop-shadow(0 0 8px var(--accent)); }
[data-theme="light"] .btn-primary::after { background: linear-gradient(100deg, transparent, rgba(255,255,255,0.6), transparent); }

/* ---------- Responsive ---------- */
@media (max-width: 880px) {
  .grid-3, .grid-2 { grid-template-columns: 1fr; }
  .tools-grid { grid-template-columns: 1fr 1fr; }
  .guard { padding: 32px 24px; }
  .guard-steps { grid-template-columns: 1fr; }
  .usecase { grid-template-columns: 1fr; gap: 24px; }
  .usecase:nth-child(even) .uc-visual { order: 0; }
  .stats { grid-template-columns: repeat(2, 1fr); gap: 30px; }
  .nav-links {
    position: fixed; inset: 64px 0 auto 0; flex-direction: column;
    background: var(--canvas-bottom); padding: 24px; gap: 18px;
    border-bottom: 1px solid var(--stroke);
    transform: translateY(-130%); transition: transform 0.3s;
  }
  .nav-links.open { transform: none; }
  .nav-toggle { display: block; }
  section.wrap { padding: 70px 24px; }
}

@media (max-width: 520px) {
  .tools-grid { grid-template-columns: 1fr; }
}