/* ==========================================================================
   Mobile Device Testing Tools — Design System
   Developer light theme: editor-inspired surfaces, syntax-accent palette,
   monospace utility type, terminal + device-frame signature motifs.
   ========================================================================== */ 

:root {
  /* Color */
  --bg: #FAFBFC;
  --surface: #FFFFFF;
  --surface-alt: #F6F8FA;
  --surface-sunken: #EEF1F4;
  --ink: #1B1F23;
  --ink-soft: #33393F;
  --muted: #6E7681;
  --border: #D7DCE1;
  --border-soft: #E7EBEF;

  --blue: #0969DA;
  --blue-dim: #DDEBFF;
  --purple: #8250DF;
  --purple-dim: #F1E9FE;
  --green: #1A7F37;
  --green-dim: #DBFCE3;
  --orange: #BC4C00;
  --orange-dim: #FFF1E5;

  /* Type */
  --font-display: 'Space Grotesk', 'Segoe UI', sans-serif;
  --font-body: 'Inter', 'Segoe UI', sans-serif;
  --font-mono: 'JetBrains Mono', 'SFMono-Regular', Consolas, monospace;

  /* Layout */
  --max-w: 1180px;
  --radius: 10px;
  --radius-sm: 6px;
  --shadow-sm: 0 1px 2px rgba(27, 31, 35, 0.06);
  --shadow-md: 0 6px 20px rgba(27, 31, 35, 0.08);
  --shadow-lg: 0 20px 48px rgba(27, 31, 35, 0.12);
}

* { box-sizing: border-box; }
html { scroll-behavior: smooth; }

@media (prefers-reduced-motion: reduce) {
  html { scroll-behavior: auto; }
  *, *::before, *::after {
    animation-duration: 0.001ms !important;
    animation-iteration-count: 1 !important;
    transition-duration: 0.001ms !important;
    scroll-behavior: auto !important;
  }
}

body {
  margin: 0;
  background: var(--bg);
  color: var(--ink);
  font-family: var(--font-body);
  font-size: 16px;
  line-height: 1.6;
  -webkit-font-smoothing: antialiased;
}

/* subtle dot-grid backdrop, editor-canvas feel */
body {
  background-image: radial-gradient(circle, #E1E6EB 1px, transparent 1px);
  background-size: 22px 22px;
  background-position: -10px -10px;
}

h1, h2, h3, h4 {
  font-family: var(--font-display);
  color: var(--ink);
  margin: 0 0 0.5em;
  letter-spacing: -0.01em;
  line-height: 1.15;
}

p { margin: 0 0 1em; color: var(--ink-soft); }
a { color: var(--blue); text-decoration: none; }
img, svg { max-width: 100%; display: block; }

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

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

.eyebrow {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  font-family: var(--font-mono);
  font-size: 12.5px;
  font-weight: 500;
  letter-spacing: 0.02em;
  color: var(--purple);
  background: var(--purple-dim);
  border: 1px solid #E4D6FC;
  padding: 5px 12px 5px 10px;
  border-radius: 999px;
  margin-bottom: 16px;
}
.eyebrow::before {
  content: "";
  width: 6px;
  height: 6px;
  border-radius: 50%;
  background: var(--purple);
}

.section {
  padding: 96px 0;
  border-bottom: 1px dashed var(--border);
  position: relative;
}
.section-alt { background: var(--surface-alt); }

.section-head {
  max-width: 640px;
  margin: 0 0 48px;
}
.section-head.center { margin-left: auto; margin-right: auto; text-align: center; }
.section-head h2 { font-size: clamp(28px, 3.6vw, 38px); }
.section-head p { font-size: 17px; }

/* reveal-on-scroll */
.reveal {
  opacity: 0;
  transform: translateY(18px);
  transition: opacity 0.6s ease, transform 0.6s ease;
}
.reveal.is-visible { opacity: 1; transform: translateY(0); }

/* ==========================================================================
   Buttons
   ========================================================================== */
.btn {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  font-family: var(--font-body);
  font-weight: 600;
  font-size: 15px;
  padding: 12px 22px;
  border-radius: var(--radius-sm);
  border: 1px solid transparent;
  cursor: pointer;
  transition: transform 0.15s ease, box-shadow 0.15s ease, background 0.15s ease, border-color 0.15s ease;
}
.btn:active { transform: translateY(1px); }

.btn-primary {
  background: var(--ink);
  color: #fff;
  box-shadow: var(--shadow-sm);
}
.btn-primary:hover { background: #000; box-shadow: var(--shadow-md); transform: translateY(-1px); }

.btn-ghost {
  background: var(--surface);
  color: var(--ink);
  border-color: var(--border);
}
.btn-ghost:hover { border-color: var(--ink); transform: translateY(-1px); }

.btn-sm { padding: 8px 14px; font-size: 13.5px; }

/* ==========================================================================
   Header
   ========================================================================== */
.site-header {
  position: sticky;
  top: 0;
  z-index: 100;
  background: rgba(250, 251, 252, 0.85);
  backdrop-filter: saturate(180%) blur(10px);
  border-bottom: 1px solid var(--border-soft);
}
.header-inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: 68px;
}
.brand {
  display: flex;
  align-items: center;
  gap: 10px;
  font-family: var(--font-display);
  font-weight: 700;
  font-size: 18px;
  color: var(--ink);
}
.brand-mark {
  width: 32px;
  height: 32px;
  border-radius: 8px;
  background: linear-gradient(135deg, var(--blue), var(--purple));
  display: flex;
  align-items: center;
  justify-content: center;
  color: #fff;
  font-family: var(--font-mono);
  font-size: 15px;
  font-weight: 700;
  box-shadow: var(--shadow-sm);
}
.nav-links {
  display: flex;
  align-items: center;
  gap: 28px;
  list-style: none;
  margin: 0;
  padding: 0;
}
.nav-links a {
  color: var(--ink-soft);
  font-size: 14.5px;
  font-weight: 500;
  position: relative;
}
.nav-links a:hover { color: var(--ink); }
.nav-actions { display: flex; align-items: center; gap: 12px; }
.nav-toggle {
  display: none;
  background: none;
  border: 1px solid var(--border);
  border-radius: var(--radius-sm);
  width: 40px;
  height: 40px;
  align-items: center;
  justify-content: center;
  cursor: pointer;
}
.nav-toggle span, .nav-toggle span::before, .nav-toggle span::after {
  content: "";
  display: block;
  width: 18px;
  height: 2px;
  background: var(--ink);
  position: relative;
  transition: transform 0.2s ease;
}
.nav-toggle span::before { position: absolute; top: -6px; }
.nav-toggle span::after { position: absolute; top: 6px; }

/* ==========================================================================
   Hero
   ========================================================================== */
.hero {
  padding: 88px 0 80px;
  border-bottom: 1px dashed var(--border);
  overflow: hidden;
}
.hero-grid {
  display: grid;
  grid-template-columns: 1.05fr 0.95fr;
  gap: 56px;
  align-items: center;
}
.hero h1 {
  font-size: clamp(34px, 4.6vw, 54px);
  margin-bottom: 20px;
}
.hero h1 .accent { color: var(--blue); }
.hero-lede {
  font-size: 18px;
  max-width: 520px;
}
.hero-actions { display: flex; gap: 14px; margin: 28px 0 34px; flex-wrap: wrap; }

.hero-meta {
  display: flex;
  gap: 22px;
  flex-wrap: wrap;
  font-family: var(--font-mono);
  font-size: 13px;
  color: var(--muted);
}
.hero-meta span { display: flex; align-items: center; gap: 6px; }
.hero-meta .dot { width: 6px; height: 6px; border-radius: 50%; background: var(--green); }

/* Terminal signature element */
.terminal {
  background: #1B1F23;
  border-radius: 12px;
  box-shadow: var(--shadow-lg);
  overflow: hidden;
  font-family: var(--font-mono);
  transform: rotate(1deg);
  transition: transform 0.4s ease;
}
.terminal:hover { transform: rotate(0deg); }
.terminal-bar {
  display: flex;
  align-items: center;
  gap: 8px;
  padding: 12px 14px;
  background: #22272E;
  border-bottom: 1px solid #30363D;
}
.terminal-dot { width: 10px; height: 10px; border-radius: 50%; }
.terminal-dot.red { background: #FF5F56; }
.terminal-dot.yellow { background: #FFBD2E; }
.terminal-dot.green { background: #27C93F; }
.terminal-title {
  margin-left: 8px;
  color: #8B949E;
  font-size: 12px;
}
.terminal-body {
  padding: 20px 18px 26px;
  min-height: 220px;
  color: #C9D1D9;
  font-size: 13.5px;
  line-height: 1.9;
}
.terminal-line { white-space: pre-wrap; word-break: break-word; }
.terminal-prompt { color: #27C93F; }
.terminal-path { color: #79C0FF; }
.terminal-flag { color: #D2A8FF; }
.terminal-value { color: #A5D6FF; }
.terminal-out { color: #8B949E; }
.terminal-out .ok { color: #3FB950; }
.cursor {
  display: inline-block;
  width: 8px;
  height: 15px;
  background: #C9D1D9;
  vertical-align: text-bottom;
  animation: blink 1s steps(1) infinite;
}
@keyframes blink { 50% { opacity: 0; } }

/* device readout under the terminal */
.device-readout {
  margin-top: 18px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 14px 18px;
  box-shadow: var(--shadow-sm);
}
.device-readout .label {
  font-family: var(--font-mono);
  font-size: 12px;
  color: var(--muted);
  text-transform: uppercase;
  letter-spacing: 0.04em;
}
.device-readout .value {
  font-family: var(--font-mono);
  font-size: 15px;
  font-weight: 600;
  color: var(--ink);
}
.device-frame-mini {
  width: 26px;
  height: 44px;
  border: 2px solid var(--ink);
  border-radius: 5px;
  position: relative;
  transition: width 0.5s ease, height 0.5s ease;
}
.device-frame-mini::after {
  content: "";
  position: absolute;
  top: -2px; left: 50%;
  transform: translateX(-50%);
  width: 8px; height: 2px;
  background: var(--ink);
  border-radius: 2px;
}

/* ==========================================================================
   Stats strip
   ========================================================================== */
.stats-strip {
  padding: 40px 0;
  border-bottom: 1px dashed var(--border);
  background: var(--surface);
}
.stats-grid {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 24px;
}
.stat {
  text-align: center;
  border-right: 1px solid var(--border-soft);
}
.stat:last-child { border-right: none; }
.stat .num {
  font-family: var(--font-display);
  font-size: 32px;
  font-weight: 700;
  color: var(--ink);
}
.stat .num .accent { color: var(--blue); }
.stat .lbl {
  font-family: var(--font-mono);
  font-size: 12.5px;
  color: var(--muted);
  margin-top: 4px;
}

/* ==========================================================================
   Tools grid
   ========================================================================== */
.tools-toolbar {
  display: flex;
  align-items: center;
  justify-content: space-between;
  flex-wrap: wrap;
  gap: 16px;
  margin-bottom: 32px;
}
.filter-pills {
  display: flex;
  gap: 8px;
  flex-wrap: wrap;
}
.filter-pill {
  font-family: var(--font-mono);
  font-size: 12.5px;
  padding: 7px 13px;
  border-radius: 999px;
  border: 1px solid var(--border);
  background: var(--surface);
  color: var(--ink-soft);
  cursor: pointer;
  transition: all 0.15s ease;
}
.filter-pill:hover { border-color: var(--ink); }
.filter-pill.active {
  background: var(--ink);
  border-color: var(--ink);
  color: #fff;
}

.tools-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 20px;
}
.tool-card {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  overflow: hidden;
  box-shadow: var(--shadow-sm);
  transition: transform 0.2s ease, box-shadow 0.2s ease, border-color 0.2s ease;
  display: flex;
  flex-direction: column;
}
.tool-card:hover {
  transform: translateY(-4px);
  box-shadow: var(--shadow-md);
  border-color: #C4CCD4;
}
.tool-card-chrome {
  display: flex;
  align-items: center;
  gap: 6px;
  padding: 10px 14px;
  background: var(--surface-alt);
  border-bottom: 1px solid var(--border-soft);
}
.tool-card-chrome .dot { width: 8px; height: 8px; border-radius: 50%; }
.tool-card-chrome .dot:nth-child(1) { background: #FF5F56; }
.tool-card-chrome .dot:nth-child(2) { background: #FFBD2E; }
.tool-card-chrome .dot:nth-child(3) { background: #27C93F; }
.tool-card-chrome .path {
  margin-left: 8px;
  font-family: var(--font-mono);
  font-size: 11px;
  color: var(--muted);
}
.tool-card-body { padding: 20px; flex: 1; display: flex; flex-direction: column; }
.tool-icon {
  font-size: 24px;
  width: 44px;
  height: 44px;
  display: flex;
  align-items: center;
  justify-content: center;
  border-radius: 9px;
  background: var(--blue-dim);
  margin-bottom: 14px;
}
.tool-card h3 { font-size: 17px; margin-bottom: 6px; }
.tool-card p { font-size: 14px; color: var(--muted); margin-bottom: 16px; flex: 1; }
.tool-card-footer {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding-top: 14px;
  border-top: 1px solid var(--border-soft);
}
.tool-tag {
  font-family: var(--font-mono);
  font-size: 11px;
  color: var(--purple);
  background: var(--purple-dim);
  padding: 3px 9px;
  border-radius: 999px;
}
.tool-status {
  font-family: var(--font-mono);
  font-size: 11px;
  color: var(--orange);
  display: flex;
  align-items: center;
  gap: 5px;
}
.tool-status::before {
  content: "";
  width: 6px; height: 6px;
  border-radius: 50%;
  background: var(--orange);
}
.tool-status.live { color: var(--green); }
.tool-status.live::before { background: var(--green); }
.tool-link {
  font-family: var(--font-mono);
  font-size: 13px;
  font-weight: 600;
  color: var(--ink);
  display: inline-flex;
  align-items: center;
  gap: 6px;
}
.tool-link svg { width: 14px; height: 14px; transition: transform 0.15s ease; }
.tool-card:hover .tool-link svg { transform: translate(2px, -2px); }

.tools-empty {
  grid-column: 1 / -1;
  text-align: center;
  padding: 40px;
  color: var(--muted);
  font-family: var(--font-mono);
  font-size: 14px;
}

/* ==========================================================================
   How it works
   ========================================================================== */
.steps {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 20px;
}
.step {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 24px;
  position: relative;
}
.step-num {
  font-family: var(--font-mono);
  font-size: 12px;
  color: var(--blue);
  background: var(--blue-dim);
  display: inline-block;
  padding: 3px 10px;
  border-radius: 999px;
  margin-bottom: 14px;
}
.step h3 { font-size: 16px; margin-bottom: 6px; }
.step p { font-size: 13.5px; color: var(--muted); margin: 0; }
.step-connector {
  position: absolute;
  top: 50%;
  right: -20px;
  width: 20px;
  height: 1px;
  background: var(--border);
  display: none;
}

/* ==========================================================================
   Feature grid
   ========================================================================== */
.feature-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 20px;
}
.feature-card {
  padding: 26px;
  border-radius: var(--radius);
  background: var(--surface);
  border: 1px solid var(--border);
  transition: border-color 0.2s ease, transform 0.2s ease;
}
.feature-card:hover { border-color: var(--ink); transform: translateY(-3px); }
.feature-icon {
  width: 40px; height: 40px;
  border-radius: 9px;
  display: flex; align-items: center; justify-content: center;
  margin-bottom: 16px;
  font-size: 20px;
}
.feature-icon.blue { background: var(--blue-dim); }
.feature-icon.purple { background: var(--purple-dim); }
.feature-icon.green { background: var(--green-dim); }
.feature-card h3 { font-size: 16.5px; margin-bottom: 6px; }
.feature-card p { font-size: 14px; margin: 0; }

/* ==========================================================================
   Use cases
   ========================================================================== */
.usecase-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 20px;
}
.usecase-card {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 24px;
  border-left: 3px solid var(--blue);
}
.usecase-card:nth-child(2) { border-left-color: var(--purple); }
.usecase-card:nth-child(3) { border-left-color: var(--green); }
.usecase-card .tag {
  font-family: var(--font-mono);
  font-size: 11.5px;
  color: var(--muted);
  text-transform: uppercase;
  letter-spacing: 0.04em;
}
.usecase-card h3 { font-size: 17px; margin: 8px 0; }
.usecase-card p { font-size: 14px; margin: 0; }

/* ==========================================================================
   Comparison table
   ========================================================================== */
.compare-table {
  width: 100%;
  border-collapse: collapse;
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  overflow: hidden;
  font-size: 14.5px;
}
.compare-table th, .compare-table td {
  padding: 14px 18px;
  text-align: left;
  border-bottom: 1px solid var(--border-soft);
}
.compare-table th {
  font-family: var(--font-mono);
  font-size: 12.5px;
  text-transform: uppercase;
  letter-spacing: 0.03em;
  color: var(--muted);
  background: var(--surface-alt);
}
.compare-table td:first-child { color: var(--ink-soft); }
.compare-table tr:last-child td { border-bottom: none; }
.check { color: var(--green); font-weight: 700; }
.cross { color: var(--muted); }

/* ==========================================================================
   FAQ
   ========================================================================== */
.faq-list { max-width: 760px; margin: 0 auto; }
.faq-item {
  border: 1px solid var(--border);
  border-radius: var(--radius-sm);
  background: var(--surface);
  margin-bottom: 12px;
  overflow: hidden;
}
.faq-question {
  width: 100%;
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 18px 20px;
  background: none;
  border: none;
  text-align: left;
  font-family: var(--font-body);
  font-size: 15.5px;
  font-weight: 600;
  color: var(--ink);
  cursor: pointer;
}
.faq-icon {
  font-family: var(--font-mono);
  color: var(--muted);
  transition: transform 0.2s ease;
  flex-shrink: 0;
  margin-left: 12px;
}
.faq-item.open .faq-icon { transform: rotate(45deg); color: var(--blue); }
.faq-answer {
  max-height: 0;
  overflow: hidden;
  transition: max-height 0.25s ease;
}
.faq-answer p { padding: 0 20px 18px; font-size: 14.5px; margin: 0; }

/* ==========================================================================
   CTA band
   ========================================================================== */
.cta-band {
  background: var(--ink);
  border-radius: 16px;
  padding: 56px 48px;
  text-align: center;
  color: #fff;
  background-image: radial-gradient(circle, rgba(255,255,255,0.06) 1px, transparent 1px);
  background-size: 20px 20px;
}
.cta-band h2 { color: #fff; font-size: clamp(24px, 3.2vw, 32px); }
.cta-band p { color: #B7BEC6; max-width: 480px; margin: 0 auto 26px; }
.cta-band .btn-primary { background: #fff; color: var(--ink); }
.cta-band .btn-primary:hover { background: var(--blue-dim); }
.cta-band .btn-ghost { background: transparent; color: #fff; border-color: #3A4048; }

/* ==========================================================================
   Footer
   ========================================================================== */
.site-footer {
  background: var(--surface-alt);
  border-top: 1px solid var(--border);
  padding: 64px 0 28px;
}
.footer-grid {
  display: grid;
  grid-template-columns: 1.4fr repeat(3, 1fr);
  gap: 32px;
  margin-bottom: 48px;
}
.footer-brand p { font-size: 14px; max-width: 280px; }
.footer-col h4 {
  font-family: var(--font-mono);
  font-size: 12.5px;
  text-transform: uppercase;
  letter-spacing: 0.04em;
  color: var(--muted);
  margin-bottom: 14px;
}
.footer-col ul { list-style: none; margin: 0; padding: 0; }
.footer-col li { margin-bottom: 10px; }
.footer-col a { color: var(--ink-soft); font-size: 14px; }
.footer-col a:hover { color: var(--blue); }
.footer-bottom {
  display: flex;
  align-items: center;
  justify-content: space-between;
  flex-wrap: wrap;
  gap: 12px;
  padding-top: 24px;
  border-top: 1px solid var(--border);
  font-size: 13px;
  color: var(--muted);
  font-family: var(--font-mono);
}
.footer-bottom a { color: var(--muted); }

/* ==========================================================================
   Responsive
   ========================================================================== */
@media (max-width: 980px) {
  .hero-grid { grid-template-columns: 1fr; }
  .terminal { transform: none; margin-top: 12px; }
  .stats-grid { grid-template-columns: repeat(2, 1fr); }
  .stat:nth-child(2) { border-right: none; }
  .tools-grid, .feature-grid, .usecase-grid { grid-template-columns: repeat(2, 1fr); }
  .steps { grid-template-columns: repeat(2, 1fr); }
  .footer-grid { grid-template-columns: 1fr 1fr; }
}

@media (max-width: 720px) {
  .nav-links, .nav-actions .btn-ghost { display: none; }
  .nav-toggle { display: flex; }
  .site-header.nav-open .nav-links {
    display: flex;
    position: absolute;
    top: 68px; left: 0; right: 0;
    flex-direction: column;
    background: var(--surface);
    border-bottom: 1px solid var(--border);
    padding: 16px 24px;
    gap: 16px;
  }
  .section { padding: 64px 0; }
  .stats-grid { grid-template-columns: repeat(2, 1fr); row-gap: 24px; }
  .stat { border-right: none; }
  .tools-grid, .feature-grid, .usecase-grid, .steps { grid-template-columns: 1fr; }
  .footer-grid { grid-template-columns: 1fr; gap: 28px; }
  .compare-table { display: block; overflow-x: auto; }
  .cta-band { padding: 40px 24px; }
  .hero-actions { flex-direction: column; align-items: stretch; }
  .hero-actions .btn { justify-content: center; }
}