/* ==========================================================================
   HiFi Buddy — marketing site
   Dark, modern, restrained. Inspired by Linear/Vercel/Resend aesthetics.
   ========================================================================== */

/* ---------- Reset & base ---------- */
*,
*::before,
*::after {
  box-sizing: border-box;
}

html {
  scroll-behavior: smooth;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
  text-rendering: optimizeLegibility;
}

body {
  margin: 0;
  background: #0a0a0f;
  color: #e6e6ee;
  font-family: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
  font-weight: 400;
  font-size: 16px;
  line-height: 1.55;
  letter-spacing: -0.01em;
  overflow-x: hidden;
  position: relative;
}

img,
svg {
  display: block;
  max-width: 100%;
}

a {
  color: inherit;
  text-decoration: none;
  transition: color 0.2s ease, opacity 0.2s ease;
}

button {
  font-family: inherit;
  cursor: pointer;
}

p {
  margin: 0 0 1em;
  color: #b6b6c4;
}

h1, h2, h3 {
  margin: 0;
  font-weight: 700;
  letter-spacing: -0.025em;
  color: #f4f4f8;
}

h1 {
  font-size: clamp(2.6rem, 5.5vw, 4.4rem);
  line-height: 1.05;
  font-weight: 800;
}

h2 {
  font-size: clamp(1.85rem, 3.4vw, 2.75rem);
  line-height: 1.15;
}

h3 {
  font-size: 1.125rem;
  line-height: 1.3;
}

ul, ol {
  margin: 0;
  padding: 0;
  list-style: none;
}

::selection {
  background: rgba(155, 89, 182, 0.45);
  color: #fff;
}

/* ---------- Tokens ---------- */
:root {
  --bg: #0a0a0f;
  --bg-alt: #0e0e16;
  --surface: #14141d;
  --surface-2: #1a1a25;
  --border: rgba(255, 255, 255, 0.06);
  --border-strong: rgba(255, 255, 255, 0.1);
  --text: #f4f4f8;
  --text-muted: #b6b6c4;
  --text-dim: #7a7a8a;

  --purple: #9b59b6;
  --indigo: #667eea;
  --emerald: #2ecc71;

  --grad: linear-gradient(135deg, #9b59b6 0%, #667eea 100%);
  --grad-soft: linear-gradient(135deg, rgba(155,89,182,0.18), rgba(102,126,234,0.18));

  --radius-sm: 8px;
  --radius: 14px;
  --radius-lg: 20px;

  --shadow-sm: 0 1px 3px rgba(0, 0, 0, 0.3);
  --shadow-glow: 0 0 60px -10px rgba(102, 126, 234, 0.45);
}

/* ---------- Layout ---------- */
.container {
  width: 100%;
  max-width: 1180px;
  margin: 0 auto;
  padding: 0 24px;
}

.section {
  padding: 120px 0;
  position: relative;
}

@media (max-width: 720px) {
  .section { padding: 80px 0; }
}

.section-head {
  max-width: 720px;
  margin: 0 auto 64px;
  text-align: center;
}

.section-tag {
  display: inline-block;
  font-size: 0.78rem;
  font-weight: 500;
  text-transform: uppercase;
  letter-spacing: 0.14em;
  color: var(--indigo);
  margin-bottom: 18px;
  padding: 6px 12px;
  border-radius: 999px;
  background: rgba(102, 126, 234, 0.1);
  border: 1px solid rgba(102, 126, 234, 0.25);
}

.section-sub {
  margin-top: 18px;
  color: var(--text-muted);
  font-size: 1.075rem;
  line-height: 1.6;
}

/* ---------- Ambient background ---------- */
.ambient {
  position: fixed;
  inset: 0;
  z-index: 0;
  overflow: hidden;
  pointer-events: none;
}

.blob {
  position: absolute;
  width: 620px;
  height: 620px;
  border-radius: 50%;
  filter: blur(120px);
  opacity: 0.32;
  will-change: transform;
}

.blob-purple {
  background: #9b59b6;
  top: -180px;
  left: -120px;
  animation: float1 22s ease-in-out infinite;
}

.blob-indigo {
  background: #667eea;
  top: 30%;
  right: -180px;
  opacity: 0.28;
  animation: float2 26s ease-in-out infinite;
}

.blob-emerald {
  background: #2ecc71;
  bottom: -200px;
  left: 30%;
  width: 500px;
  height: 500px;
  opacity: 0.12;
  animation: float3 30s ease-in-out infinite;
}

@keyframes float1 {
  0%, 100% { transform: translate(0, 0) scale(1); }
  50%      { transform: translate(80px, 50px) scale(1.08); }
}
@keyframes float2 {
  0%, 100% { transform: translate(0, 0) scale(1); }
  50%      { transform: translate(-60px, 40px) scale(0.95); }
}
@keyframes float3 {
  0%, 100% { transform: translate(0, 0) scale(1); }
  50%      { transform: translate(40px, -60px) scale(1.05); }
}

body > *:not(.ambient) {
  position: relative;
  z-index: 1;
}

/* ---------- Navigation ---------- */
.nav {
  position: sticky;
  top: 0;
  z-index: 50;
  backdrop-filter: blur(18px) saturate(180%);
  -webkit-backdrop-filter: blur(18px) saturate(180%);
  background: rgba(10, 10, 15, 0.65);
  border-bottom: 1px solid transparent;
  transition: border-color 0.2s ease, background 0.2s ease;
}

.nav.scrolled {
  border-bottom-color: var(--border);
  background: rgba(10, 10, 15, 0.85);
}

.nav-inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: 68px;
}

.logo {
  display: flex;
  align-items: center;
  gap: 10px;
  font-weight: 700;
  font-size: 1.05rem;
  letter-spacing: -0.02em;
  color: var(--text);
}

.logo:hover { opacity: 0.85; }

.nav-links {
  display: flex;
  align-items: center;
  gap: 28px;
}

.nav-links a {
  color: var(--text-muted);
  font-size: 0.92rem;
  font-weight: 500;
}

.nav-links a:hover { color: var(--text); }

.nav-cta {
  padding: 8px 16px;
  border: 1px solid var(--border-strong);
  border-radius: 999px;
  background: rgba(255, 255, 255, 0.03);
  color: var(--text) !important;
  transition: background 0.2s ease, border-color 0.2s ease, transform 0.2s ease;
}

.nav-cta:hover {
  background: rgba(255, 255, 255, 0.06);
  border-color: rgba(255, 255, 255, 0.18);
  transform: translateY(-1px);
}

@media (max-width: 720px) {
  .nav-links a:not(.nav-cta) { display: none; }
}

/* ---------- Buttons ---------- */
.btn {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 13px 22px;
  border-radius: 10px;
  font-size: 0.95rem;
  font-weight: 500;
  letter-spacing: -0.01em;
  border: 1px solid transparent;
  cursor: pointer;
  transition: transform 0.2s ease, background 0.2s ease, border-color 0.2s ease, box-shadow 0.2s ease;
  white-space: nowrap;
}

.btn-primary {
  background: var(--grad);
  color: #fff;
  box-shadow: 0 1px 0 rgba(255, 255, 255, 0.18) inset, 0 8px 24px -8px rgba(102, 126, 234, 0.55);
}

.btn-primary:hover {
  transform: translateY(-1px);
  box-shadow: 0 1px 0 rgba(255, 255, 255, 0.22) inset, 0 14px 30px -8px rgba(102, 126, 234, 0.7);
}

.btn-ghost {
  background: rgba(255, 255, 255, 0.03);
  color: var(--text);
  border-color: var(--border-strong);
}

.btn-ghost:hover {
  background: rgba(255, 255, 255, 0.07);
  border-color: rgba(255, 255, 255, 0.18);
  transform: translateY(-1px);
}

/* ---------- Hero ---------- */
.hero {
  padding: 100px 0 80px;
  position: relative;
}

@media (max-width: 720px) {
  .hero { padding: 64px 0 48px; }
}

.hero-inner {
  display: grid;
  grid-template-columns: 1.05fr 0.95fr;
  gap: 64px;
  align-items: center;
}

@media (max-width: 980px) {
  .hero-inner {
    grid-template-columns: 1fr;
    gap: 48px;
  }
}

.eyebrow {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 6px 14px 6px 12px;
  border-radius: 999px;
  background: rgba(46, 204, 113, 0.08);
  border: 1px solid rgba(46, 204, 113, 0.22);
  color: #6fe2a4;
  font-size: 0.82rem;
  font-weight: 500;
  letter-spacing: -0.01em;
  margin-bottom: 28px;
}

.eyebrow-dot {
  width: 7px;
  height: 7px;
  border-radius: 50%;
  background: var(--emerald);
  box-shadow: 0 0 10px var(--emerald);
  animation: pulse 2.4s ease-in-out infinite;
}

@keyframes pulse {
  0%, 100% { opacity: 1; transform: scale(1); }
  50%      { opacity: 0.55; transform: scale(0.9); }
}

.hero h1 {
  margin-bottom: 24px;
}

.grad-text {
  display: block;
  background: var(--grad);
  -webkit-background-clip: text;
  background-clip: text;
  color: transparent;
  -webkit-text-fill-color: transparent;
}

.lede {
  font-size: 1.15rem;
  line-height: 1.6;
  color: var(--text-muted);
  margin-bottom: 36px;
  max-width: 560px;
}

.hero-ctas {
  display: flex;
  gap: 12px;
  flex-wrap: wrap;
  margin-bottom: 36px;
}

.hero-meta {
  display: flex;
  flex-wrap: wrap;
  gap: 22px;
  font-size: 0.88rem;
  color: var(--text-dim);
  font-weight: 500;
}

.hero-meta li {
  display: inline-flex;
  align-items: center;
  gap: 8px;
}

.hero-meta .dot {
  width: 5px;
  height: 5px;
  border-radius: 50%;
  background: var(--indigo);
  box-shadow: 0 0 8px rgba(102, 126, 234, 0.7);
}

/* ---------- Hero visual ---------- */
.hero-visual {
  position: relative;
}

.visual-card {
  position: relative;
  background: linear-gradient(180deg, rgba(20, 20, 29, 0.9), rgba(14, 14, 22, 0.85));
  border: 1px solid var(--border-strong);
  border-radius: var(--radius-lg);
  padding: 22px;
  backdrop-filter: blur(10px);
  box-shadow: 0 30px 60px -20px rgba(0, 0, 0, 0.6), 0 0 80px -30px rgba(155, 89, 182, 0.3);
  overflow: hidden;
}

.visual-card::before {
  content: '';
  position: absolute;
  inset: 0;
  border-radius: var(--radius-lg);
  padding: 1px;
  background: linear-gradient(135deg, rgba(155,89,182,0.45), rgba(102,126,234,0.15) 50%, transparent 70%);
  -webkit-mask: linear-gradient(#000 0 0) content-box, linear-gradient(#000 0 0);
  -webkit-mask-composite: xor;
          mask-composite: exclude;
  pointer-events: none;
}

.visual-header {
  display: flex;
  justify-content: space-between;
  align-items: center;
  margin-bottom: 18px;
  font-size: 0.85rem;
}

.vh-track {
  font-weight: 600;
  color: var(--text);
  letter-spacing: -0.01em;
}

.vh-source {
  color: var(--text-dim);
  font-family: 'JetBrains Mono', ui-monospace, monospace;
  font-size: 0.74rem;
  padding: 4px 9px;
  border-radius: 6px;
  background: rgba(46, 204, 113, 0.08);
  border: 1px solid rgba(46, 204, 113, 0.2);
  color: #6fe2a4;
}

.waveform {
  height: 88px;
  margin: 6px 0 22px;
  display: grid;
  grid-template-columns: repeat(60, 1fr);
  gap: 3px;
  align-items: center;
}

.waveform::before,
.waveform::after { display: none; }

.waveform .bar {
  width: 100%;
  border-radius: 3px;
  background: linear-gradient(180deg, rgba(102,126,234,0.85), rgba(155,89,182,0.9));
  animation: barPulse 2.4s ease-in-out infinite;
  transform-origin: center;
}

@keyframes barPulse {
  0%, 100% { transform: scaleY(0.5); opacity: 0.55; }
  50%      { transform: scaleY(1);   opacity: 1; }
}

.timestamps {
  display: flex;
  flex-direction: column;
  gap: 8px;
}

.ts {
  display: flex;
  gap: 12px;
  padding: 10px 12px;
  border-radius: var(--radius-sm);
  border: 1px solid transparent;
  transition: background 0.2s ease, border-color 0.2s ease, transform 0.2s ease;
  cursor: pointer;
}

.ts:hover {
  background: rgba(255, 255, 255, 0.03);
  border-color: var(--border);
}

.ts.active {
  background: rgba(102, 126, 234, 0.08);
  border-color: rgba(102, 126, 234, 0.3);
}

.ts-time {
  font-family: 'JetBrains Mono', ui-monospace, monospace;
  font-size: 0.78rem;
  color: var(--indigo);
  font-weight: 500;
  padding-top: 2px;
  min-width: 38px;
}

.ts-body strong {
  display: block;
  font-size: 0.88rem;
  color: var(--text);
  margin-bottom: 2px;
  font-weight: 600;
}

.ts-body p {
  margin: 0;
  font-size: 0.82rem;
  color: var(--text-muted);
  line-height: 1.45;
}

.visual-footer {
  display: flex;
  justify-content: space-between;
  align-items: center;
  margin-top: 18px;
  padding-top: 16px;
  border-top: 1px solid var(--border);
  font-size: 0.78rem;
  color: var(--text-dim);
}

.abx-pill {
  display: inline-flex;
  align-items: center;
  gap: 7px;
  padding: 4px 10px;
  border-radius: 999px;
  background: rgba(155, 89, 182, 0.1);
  border: 1px solid rgba(155, 89, 182, 0.28);
  color: #c194d8;
  font-weight: 500;
  font-size: 0.74rem;
  letter-spacing: 0.01em;
}

.abx-dot {
  width: 5px;
  height: 5px;
  border-radius: 50%;
  background: var(--purple);
  box-shadow: 0 0 8px var(--purple);
}

.visual-shortcut {
  font-family: 'JetBrains Mono', ui-monospace, monospace;
  font-size: 0.72rem;
}

/* ---------- Why grid ---------- */
.why-grid {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 16px;
}

@media (max-width: 720px) {
  .why-grid { grid-template-columns: 1fr; }
}

.why-card {
  position: relative;
  padding: 32px 28px;
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  transition: border-color 0.25s ease, transform 0.25s ease, background 0.25s ease;
}

.why-card:hover {
  border-color: var(--border-strong);
  background: var(--surface-2);
  transform: translateY(-2px);
}

.why-num {
  font-family: 'JetBrains Mono', ui-monospace, monospace;
  font-size: 0.78rem;
  color: var(--indigo);
  font-weight: 500;
  margin-bottom: 18px;
  letter-spacing: 0.06em;
}

.why-card h3 {
  font-size: 1.25rem;
  margin-bottom: 12px;
  letter-spacing: -0.02em;
}

.why-card p {
  font-size: 0.95rem;
  margin: 0;
  line-height: 1.6;
}

.why-card em {
  color: var(--text);
  font-style: italic;
}

/* ---------- Feature grid ---------- */
.feature-grid {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 16px;
}

@media (max-width: 1080px) {
  .feature-grid { grid-template-columns: repeat(2, 1fr); }
}

@media (max-width: 540px) {
  .feature-grid { grid-template-columns: 1fr; }
}

.feature-card {
  position: relative;
  padding: 28px 24px;
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  transition: border-color 0.25s ease, transform 0.25s ease, background 0.25s ease;
  overflow: hidden;
}

.feature-card:hover {
  border-color: var(--border-strong);
  background: var(--surface-2);
  transform: translateY(-2px);
}

.feature-icon {
  width: 42px;
  height: 42px;
  border-radius: 10px;
  display: grid;
  place-items: center;
  background: var(--grad-soft);
  color: #c5b3e8;
  margin-bottom: 18px;
  border: 1px solid rgba(155, 89, 182, 0.18);
}

.feature-card h3 {
  font-size: 1.05rem;
  margin-bottom: 10px;
  letter-spacing: -0.015em;
}

.feature-card p {
  font-size: 0.9rem;
  margin: 0;
  line-height: 1.6;
  color: var(--text-muted);
}

.soon-pill {
  position: absolute;
  top: 18px;
  right: 18px;
  font-size: 0.66rem;
  font-weight: 600;
  letter-spacing: 0.1em;
  text-transform: uppercase;
  padding: 3px 8px;
  border-radius: 4px;
  background: rgba(46, 204, 113, 0.1);
  color: #6fe2a4;
  border: 1px solid rgba(46, 204, 113, 0.25);
}

/* ---------- Steps ---------- */
.steps {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 16px;
  counter-reset: step;
}

@media (max-width: 980px) { .steps { grid-template-columns: repeat(2, 1fr); } }
@media (max-width: 540px) { .steps { grid-template-columns: 1fr; } }

.step {
  position: relative;
  padding: 28px 24px;
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius);
}

.step-num {
  width: 32px;
  height: 32px;
  border-radius: 50%;
  display: grid;
  place-items: center;
  background: var(--grad);
  color: #fff;
  font-weight: 600;
  font-size: 0.85rem;
  margin-bottom: 18px;
  box-shadow: 0 0 24px -8px rgba(102, 126, 234, 0.6);
}

.step h3 {
  font-size: 1.05rem;
  margin-bottom: 10px;
}

.step p {
  font-size: 0.9rem;
  margin: 0;
  color: var(--text-muted);
  line-height: 1.6;
}

/* ---------- The science ---------- */
.section-science {
  background: linear-gradient(180deg, transparent, rgba(155, 89, 182, 0.04), transparent);
}

.science-grid {
  display: grid;
  grid-template-columns: 1.05fr 0.95fr;
  gap: 64px;
  align-items: center;
}

@media (max-width: 880px) {
  .science-grid {
    grid-template-columns: 1fr;
    gap: 40px;
  }
}

.science-copy h2 {
  margin: 14px 0 24px;
}

.science-copy p {
  font-size: 1rem;
  line-height: 1.7;
}

.science-copy strong {
  color: var(--text);
  font-weight: 600;
}

.science-card {
  background: linear-gradient(180deg, rgba(20, 20, 29, 0.9), rgba(14, 14, 22, 0.85));
  border: 1px solid var(--border-strong);
  border-radius: var(--radius-lg);
  padding: 32px;
  position: relative;
  overflow: hidden;
  box-shadow: 0 30px 60px -20px rgba(0, 0, 0, 0.6);
}

.science-card::before {
  content: '';
  position: absolute;
  inset: 0;
  background: radial-gradient(600px 300px at 100% 0%, rgba(155,89,182,0.18), transparent 60%);
  pointer-events: none;
}

.science-card-head {
  display: flex;
  justify-content: space-between;
  align-items: center;
  margin-bottom: 28px;
  position: relative;
}

.science-label {
  font-family: 'JetBrains Mono', ui-monospace, monospace;
  font-size: 0.74rem;
  letter-spacing: 0.1em;
  text-transform: uppercase;
  color: var(--text-dim);
}

.science-status {
  display: inline-flex;
  align-items: center;
  gap: 7px;
  padding: 4px 10px;
  border-radius: 999px;
  background: rgba(46, 204, 113, 0.1);
  border: 1px solid rgba(46, 204, 113, 0.3);
  color: #6fe2a4;
  font-size: 0.74rem;
  font-weight: 500;
}

.science-status::before {
  content: '';
  width: 6px;
  height: 6px;
  border-radius: 50%;
  background: var(--emerald);
  box-shadow: 0 0 8px var(--emerald);
}

.science-stat {
  display: flex;
  align-items: baseline;
  gap: 6px;
  position: relative;
}

.stat-num {
  font-size: 4.4rem;
  font-weight: 800;
  letter-spacing: -0.04em;
  line-height: 1;
  background: var(--grad);
  -webkit-background-clip: text;
  background-clip: text;
  color: transparent;
  -webkit-text-fill-color: transparent;
}

.stat-denom {
  font-size: 1.4rem;
  color: var(--text-dim);
  font-weight: 500;
}

.stat-caption {
  margin: 6px 0 24px;
  font-size: 0.86rem;
  color: var(--text-dim);
}

.pvalue-row {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 12px;
  margin-bottom: 18px;
  position: relative;
}

.pvalue-row > div {
  background: rgba(255, 255, 255, 0.03);
  border: 1px solid var(--border);
  border-radius: var(--radius-sm);
  padding: 12px 14px;
  display: flex;
  flex-direction: column;
  gap: 4px;
}

.pv-label {
  font-size: 0.72rem;
  text-transform: uppercase;
  letter-spacing: 0.1em;
  color: var(--text-dim);
  font-family: 'JetBrains Mono', ui-monospace, monospace;
}

.pv-num {
  font-size: 1.1rem;
  color: var(--text);
  font-weight: 600;
  font-family: 'JetBrains Mono', ui-monospace, monospace;
  letter-spacing: -0.01em;
}

.bar {
  height: 6px;
  background: rgba(255, 255, 255, 0.05);
  border-radius: 999px;
  overflow: hidden;
  margin-bottom: 16px;
  position: relative;
}

.bar-fill {
  height: 100%;
  background: var(--grad);
  border-radius: 999px;
  box-shadow: 0 0 18px rgba(102, 126, 234, 0.6);
}

.science-blurb {
  margin: 0;
  font-size: 0.9rem;
  color: var(--text-muted);
  line-height: 1.55;
  position: relative;
}

/* ---------- Install ---------- */
.install-grid {
  display: grid;
  grid-template-columns: 1.2fr 0.8fr;
  gap: 32px;
  align-items: stretch;
}

@media (max-width: 880px) {
  .install-grid { grid-template-columns: 1fr; }
}

.install-code {
  position: relative;
  background: linear-gradient(180deg, #14141d, #0f0f17);
  border: 1px solid var(--border-strong);
  border-radius: var(--radius);
  overflow: hidden;
  box-shadow: 0 20px 60px -20px rgba(0,0,0,0.6);
}

.code-tabs {
  display: flex;
  align-items: center;
  gap: 8px;
  padding: 12px 16px;
  border-bottom: 1px solid var(--border);
  background: rgba(255, 255, 255, 0.02);
}

.code-tab {
  font-family: 'JetBrains Mono', ui-monospace, monospace;
  font-size: 0.75rem;
  color: var(--text-muted);
  padding: 4px 10px;
  border-radius: 5px;
  background: rgba(255,255,255,0.04);
  border: 1px solid var(--border);
}

.code-tab.active {
  color: var(--text);
  background: rgba(102, 126, 234, 0.1);
  border-color: rgba(102, 126, 234, 0.25);
}

.code-dot {
  width: 9px;
  height: 9px;
  border-radius: 50%;
  background: rgba(255, 255, 255, 0.08);
}

.code-dot:nth-of-type(2) { background: rgba(155, 89, 182, 0.3); }
.code-dot:nth-of-type(3) { background: rgba(102, 126, 234, 0.3); }
.code-dot:nth-of-type(4) { background: rgba(46, 204, 113, 0.3); }

.install-code pre {
  margin: 0;
  padding: 26px 24px 28px;
  overflow-x: auto;
  font-family: 'JetBrains Mono', ui-monospace, monospace;
  font-size: 0.92rem;
  line-height: 1.85;
  color: var(--text);
}

.c-prompt { color: #6fe2a4; user-select: none; margin-right: 6px; }
.c-cmd    { color: #c194d8; }
.c-comment{ color: var(--text-dim); font-style: italic; }

.copy-btn {
  position: absolute;
  top: 14px;
  right: 16px;
  display: inline-flex;
  align-items: center;
  gap: 6px;
  padding: 6px 12px;
  font-size: 0.78rem;
  color: var(--text-muted);
  background: rgba(255, 255, 255, 0.04);
  border: 1px solid var(--border);
  border-radius: 6px;
  transition: background 0.2s ease, color 0.2s ease, border-color 0.2s ease;
}

.copy-btn:hover {
  background: rgba(255, 255, 255, 0.08);
  color: var(--text);
  border-color: var(--border-strong);
}

.copy-btn.copied {
  color: #6fe2a4;
  background: rgba(46, 204, 113, 0.1);
  border-color: rgba(46, 204, 113, 0.3);
}

.reqs {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 28px 26px;
}

.reqs h3 {
  font-size: 0.95rem;
  margin-bottom: 18px;
  text-transform: uppercase;
  letter-spacing: 0.12em;
  font-weight: 600;
  color: var(--text-dim);
}

.req-list {
  display: flex;
  flex-direction: column;
  gap: 16px;
}

.req-list li {
  display: flex;
  gap: 12px;
}

.req-dot {
  flex-shrink: 0;
  width: 8px;
  height: 8px;
  border-radius: 50%;
  background: var(--grad);
  margin-top: 8px;
  box-shadow: 0 0 10px rgba(102, 126, 234, 0.5);
}

.req-list strong {
  display: block;
  font-size: 0.95rem;
  font-weight: 600;
  color: var(--text);
  margin-bottom: 2px;
}

.req-list span {
  display: block;
  font-size: 0.86rem;
  color: var(--text-muted);
  line-height: 1.5;
}

/* ---------- Open source ---------- */
.section-os {
  padding-top: 80px;
  padding-bottom: 120px;
}

.os-inner {
  text-align: center;
  max-width: 760px;
  margin: 0 auto;
}

.os-inner h2 {
  margin: 14px 0 24px;
}

.os-inner p {
  font-size: 1rem;
  line-height: 1.7;
  color: var(--text-muted);
}

.os-actions {
  display: flex;
  justify-content: center;
  gap: 12px;
  margin: 36px 0 36px;
  flex-wrap: wrap;
}

.built-with {
  display: flex;
  flex-wrap: wrap;
  justify-content: center;
  align-items: center;
  gap: 10px;
  font-size: 0.85rem;
  color: var(--text-dim);
}

.bw-label {
  text-transform: uppercase;
  letter-spacing: 0.14em;
  font-size: 0.72rem;
  margin-right: 6px;
  color: var(--text-dim);
}

.bw-item {
  font-family: 'JetBrains Mono', ui-monospace, monospace;
  font-size: 0.82rem;
  color: var(--text-muted);
}

.bw-sep {
  color: rgba(255, 255, 255, 0.15);
}

/* ---------- Footer ---------- */
.footer {
  border-top: 1px solid var(--border);
  padding: 40px 0;
}

.footer-inner {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  justify-content: space-between;
  gap: 18px;
}

.footer-brand {
  display: flex;
  align-items: center;
  gap: 10px;
  font-weight: 600;
  color: var(--text);
}

.footer-note {
  margin: 0;
  font-size: 0.86rem;
  color: var(--text-dim);
}

.footer-links {
  display: flex;
  gap: 22px;
  font-size: 0.86rem;
}

.footer-links a {
  color: var(--text-muted);
}

.footer-links a:hover { color: var(--text); }

@media (max-width: 540px) {
  .footer-inner { flex-direction: column; align-items: flex-start; gap: 16px; text-align: left; }
}

/* ---------- Reveal animations ---------- */
.reveal {
  opacity: 0;
  transform: translateY(16px);
  transition: opacity 0.7s ease, transform 0.7s ease;
}

.reveal.visible {
  opacity: 1;
  transform: translateY(0);
}

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

/* Product tour */
.section-tour { padding-top: 40px; }
.tour-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 32px;
  max-width: 1200px;
  margin: 0 auto;
}
.tour-shot {
  margin: 0;
  background: rgba(255, 255, 255, 0.02);
  border: 1px solid rgba(255, 255, 255, 0.06);
  border-radius: 14px;
  overflow: hidden;
  transition: border-color 200ms ease, transform 200ms ease;
}
.tour-shot:hover {
  border-color: rgba(155, 89, 182, 0.35);
  transform: translateY(-2px);
}
.tour-shot-wide { grid-column: 1 / -1; }
.tour-shot img {
  display: block;
  width: 100%;
  height: auto;
  background: #0b0a14;
}
.tour-shot figcaption {
  padding: 20px 24px 24px;
  font-size: 0.95rem;
  line-height: 1.55;
  color: var(--muted, #a8a4b8);
}
.tour-shot figcaption strong {
  display: block;
  color: var(--text, #f3f1f8);
  font-weight: 600;
  margin-bottom: 6px;
}
@media (max-width: 768px) {
  .tour-grid { grid-template-columns: 1fr; gap: 20px; }
  .tour-shot figcaption { padding: 16px 18px 20px; font-size: 0.9rem; }
}