/* ============================================================
   TruMouse — Shared stylesheet
   Theme switching via body class: .theme-blue | .theme-green | .theme-violet
   ============================================================ */

:root {
  --bg: #04091a;
  --bg2: #070e22;
  --surface: #0d1730;
  --text: #e2eeff;
  --muted: #7a96b8;
  --mono: 'IBM Plex Mono', monospace;
  --sans: 'Sora', sans-serif;
}

body.theme-blue {
  --accent: #38bdf8;
  --accent-rgb: 56, 189, 248;
  --accent-hover: #7dd3fc;
}

body.theme-green {
  --accent: #34d399;
  --accent-rgb: 52, 211, 153;
  --accent-hover: #6ee7b7;
}

body.theme-violet {
  --accent: #a78bfa;
  --accent-rgb: 167, 139, 250;
  --accent-hover: #c4b5fd;
}

body {
  --border: rgba(var(--accent-rgb), 0.12);
  --accent-dim: rgba(var(--accent-rgb), 0.1);
}

/* ── Reset ── */
*,
*::before,
*::after {
  box-sizing: border-box;
  margin: 0;
  padding: 0;
}

html {
  scroll-behavior: smooth;
}

body {
  background: var(--bg);
  color: var(--text);
  font-family: var(--sans);
  font-size: 16px;
  line-height: 1.7;
  overflow-x: hidden;
}

/* Fixed grid background */
body::before {
  content: '';
  position: fixed;
  inset: 0;
  background-image:
    linear-gradient(rgba(var(--accent-rgb), 0.03) 1px, transparent 1px),
    linear-gradient(90deg, rgba(var(--accent-rgb), 0.03) 1px, transparent 1px);
  background-size: 60px 60px;
  pointer-events: none;
  z-index: 0;
}

/* ── Nav ── */
nav {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  z-index: 100;
  padding: 0 48px;
  height: 64px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  background: rgba(4, 9, 26, 0.85);
  backdrop-filter: blur(12px);
  border-bottom: 1px solid var(--border);
}

.nav-left {
  display: flex;
  align-items: center;
  gap: 32px;
}

.nav-logo {
  font-family: var(--mono);
  font-size: 13px;
  font-weight: 600;
  color: var(--accent);
  letter-spacing: 0.08em;
  text-decoration: none;
}

.nav-products {
  display: flex;
  gap: 24px;
  list-style: none;
}

.nav-products a {
  font-size: 13px;
  color: var(--muted);
  text-decoration: none;
  letter-spacing: 0.04em;
  transition: color 0.2s;
}

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

.nav-products a.active {
  color: var(--accent);
}

.nav-links {
  display: flex;
  gap: 36px;
  list-style: none;
}

.nav-links a {
  font-size: 13px;
  color: var(--muted);
  text-decoration: none;
  letter-spacing: 0.04em;
  transition: color 0.2s;
}

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

.nav-links a.active {
  color: var(--accent);
}

/* ── Section frames ── */
section {
  position: relative;
  z-index: 1;
}

.container {
  max-width: 1080px;
  margin: 0 auto;
  padding: 0 48px;
}

.section-pad {
  padding: 120px 0;
}

.divider {
  height: 1px;
  background: var(--border);
  margin: 0 48px;
}

.section-label {
  font-family: var(--mono);
  font-size: 11px;
  letter-spacing: 0.18em;
  text-transform: uppercase;
  color: var(--accent);
  margin-bottom: 20px;
  display: flex;
  align-items: center;
  gap: 12px;
}

.section-label::before {
  content: '';
  width: 24px;
  height: 1px;
  background: var(--accent);
}

.section-label.center {
  justify-content: center;
  margin-bottom: 16px;
}

h2 {
  font-size: clamp(28px, 4vw, 44px);
  font-weight: 700;
  letter-spacing: -0.02em;
  line-height: 1.15;
  margin-bottom: 20px;
}

.section-intro {
  font-size: 17px;
  color: var(--muted);
  max-width: 520px;
  line-height: 1.7;
  margin-bottom: 72px;
}

/* ── Hero ── */
#hero {
  min-height: 100vh;
  display: flex;
  align-items: center;
  padding: 120px 0 80px;
}

.hero-inner {
  max-width: 1080px;
  margin: 0 auto;
  padding: 0 48px;
  width: 100%;
}

.hero-label {
  font-family: var(--mono);
  font-size: 11px;
  letter-spacing: 0.18em;
  text-transform: uppercase;
  color: var(--accent);
  margin-bottom: 32px;
  display: flex;
  align-items: center;
  gap: 12px;
  opacity: 0;
  animation: fadeUp 0.8s 0.1s forwards;
}

.hero-label::before {
  content: '';
  width: 32px;
  height: 1px;
  background: var(--accent);
}

h1 {
  font-size: clamp(44px, 7vw, 80px);
  font-weight: 700;
  line-height: 1.05;
  letter-spacing: -0.02em;
  margin-bottom: 28px;
  opacity: 0;
  animation: fadeUp 0.8s 0.2s forwards;
}

h1 em {
  font-style: normal;
  color: var(--accent);
}

.hero-sub {
  font-size: 18px;
  color: var(--muted);
  max-width: 620px;
  line-height: 1.65;
  margin-bottom: 52px;
  opacity: 0;
  animation: fadeUp 0.8s 0.35s forwards;
}

.hero-pills,
.hero-badges {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  margin-bottom: 56px;
  opacity: 0;
  animation: fadeUp 0.8s 0.45s forwards;
}

.pill {
  font-family: var(--mono);
  font-size: 11px;
  letter-spacing: 0.1em;
  padding: 7px 16px;
  border: 1px solid var(--border);
  border-radius: 100px;
  color: var(--muted);
  background: rgba(var(--accent-rgb), 0.04);
}

.badge {
  font-family: var(--mono);
  font-size: 11px;
  letter-spacing: 0.1em;
  padding: 7px 16px;
  border-radius: 100px;
  color: var(--accent);
  background: var(--accent-dim);
  border: 1px solid rgba(var(--accent-rgb), 0.25);
}

.badge.neutral {
  color: var(--muted);
  background: rgba(var(--accent-rgb), 0.04);
  border: 1px solid var(--border);
}

.hero-cta {
  display: flex;
  gap: 16px;
  flex-wrap: wrap;
  opacity: 0;
  animation: fadeUp 0.8s 0.55s forwards;
}

/* ── Buttons ── */
.btn-primary {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 14px 28px;
  background: var(--accent);
  color: #04091a;
  font-family: var(--sans);
  font-size: 14px;
  font-weight: 600;
  letter-spacing: 0.02em;
  text-decoration: none;
  border-radius: 6px;
  transition: background 0.2s, transform 0.15s;
  border: none;
  cursor: pointer;
}

.btn-primary:hover {
  background: var(--accent-hover);
  transform: translateY(-1px);
}

.btn-secondary {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 14px 28px;
  background: transparent;
  color: var(--text);
  font-family: var(--sans);
  font-size: 14px;
  font-weight: 400;
  letter-spacing: 0.02em;
  text-decoration: none;
  border-radius: 6px;
  border: 1px solid var(--border);
  transition: border-color 0.2s, color 0.2s;
  cursor: pointer;
}

.btn-secondary:hover {
  border-color: rgba(var(--accent-rgb), 0.4);
  color: var(--accent);
}

/* ── Problem: two-card grid (NLP) ── */
.problem-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 2px;
  background: var(--border);
  border: 1px solid var(--border);
  border-radius: 12px;
  overflow: hidden;
}

.problem-card {
  background: var(--surface);
  padding: 48px;
}

.problem-card:first-child {
  border-right: 1px solid var(--border);
}

.problem-num {
  font-family: var(--mono);
  font-size: 11px;
  color: var(--accent);
  letter-spacing: 0.12em;
  margin-bottom: 20px;
}

.problem-card h3 {
  font-size: 20px;
  font-weight: 600;
  margin-bottom: 14px;
  letter-spacing: -0.01em;
}

.problem-card p {
  font-size: 15px;
  color: var(--muted);
  line-height: 1.7;
}

.problem-solution {
  margin-top: 2px;
  background: rgba(var(--accent-rgb), 0.06);
  border: 1px solid rgba(var(--accent-rgb), 0.2);
  border-radius: 0 0 12px 12px;
  padding: 36px 48px;
  display: flex;
  align-items: center;
  gap: 20px;
}

.solution-badge {
  font-family: var(--mono);
  font-size: 10px;
  letter-spacing: 0.14em;
  text-transform: uppercase;
  color: var(--accent);
  white-space: nowrap;
  padding: 6px 14px;
  border: 1px solid rgba(var(--accent-rgb), 0.3);
  border-radius: 100px;
  background: rgba(var(--accent-rgb), 0.06);
}

.solution-text {
  font-size: 15px;
  color: var(--text);
  line-height: 1.6;
}

/* ── Problem: single card with split body (MouseScope) ── */
.problem-single {
  border: 1px solid var(--border);
  border-radius: 12px;
  overflow: hidden;
}

.problem-body {
  padding: 48px;
  background: var(--surface);
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 48px;
  align-items: start;
}

.problem-body h3 {
  font-size: 22px;
  font-weight: 600;
  margin-bottom: 16px;
  letter-spacing: -0.01em;
  grid-column: 1 / -1;
}

.problem-col p {
  font-size: 15px;
  color: var(--muted);
  line-height: 1.7;
}

.problem-single .problem-solution {
  margin-top: 0;
  padding: 32px 48px;
  background: var(--accent-dim);
  border: none;
  border-top: 1px solid rgba(var(--accent-rgb), 0.2);
  border-radius: 0;
}

/* ── Steps grid (NLP system architecture) ── */
.steps {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 1px;
  background: var(--border);
  border: 1px solid var(--border);
  border-radius: 12px;
  overflow: hidden;
}

.step {
  background: var(--bg2);
  padding: 48px 40px;
  position: relative;
}

.step-num {
  font-family: var(--mono);
  font-size: 48px;
  font-weight: 300;
  color: rgba(var(--accent-rgb), 0.15);
  line-height: 1;
  margin-bottom: 28px;
  display: block;
}

.step-icon {
  width: 40px;
  height: 40px;
  background: rgba(var(--accent-rgb), 0.08);
  border: 1px solid rgba(var(--accent-rgb), 0.2);
  border-radius: 8px;
  display: flex;
  align-items: center;
  justify-content: center;
  margin-bottom: 24px;
  font-size: 18px;
}

.step h3 {
  font-size: 18px;
  font-weight: 600;
  margin-bottom: 12px;
  letter-spacing: -0.01em;
}

.step p {
  font-size: 14px;
  color: var(--muted);
  line-height: 1.7;
}

.step-tag {
  font-family: var(--mono);
  font-size: 10px;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  color: var(--accent);
  margin-bottom: 16px;
  display: block;
}

/* ── Callout ── */
.callout {
  margin-top: 24px;
  padding: 28px 36px;
  background: rgba(var(--accent-rgb), 0.04);
  border-left: 3px solid var(--accent);
  border-radius: 0 8px 8px 0;
}

.callout p {
  font-size: 15px;
  color: var(--text);
  line-height: 1.65;
}

.callout strong {
  color: var(--accent);
}

/* ── Metrics ── */
.metrics-grid {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 24px;
}

.metric-group {
  border: 1px solid var(--border);
  border-radius: 12px;
  overflow: hidden;
}

.metric-group-header {
  padding: 20px 28px;
  background: var(--surface);
  display: flex;
  align-items: center;
  justify-content: space-between;
  border-bottom: 1px solid var(--border);
}

.metric-group-header h3 {
  font-size: 14px;
  font-weight: 600;
  letter-spacing: 0.01em;
}

.metric-count {
  font-family: var(--mono);
  font-size: 11px;
  color: var(--accent);
  background: rgba(var(--accent-rgb), 0.08);
  padding: 3px 10px;
  border-radius: 100px;
  border: 1px solid rgba(var(--accent-rgb), 0.2);
}

.metric-list {
  padding: 20px 28px;
  display: flex;
  flex-direction: column;
  gap: 10px;
}

.metric-item {
  display: flex;
  align-items: flex-start;
  gap: 12px;
  font-size: 13px;
}

.metric-item::before {
  content: '—';
  color: var(--accent);
  font-family: var(--mono);
  font-size: 11px;
  margin-top: 3px;
  flex-shrink: 0;
}

.metric-item strong {
  font-weight: 500;
  color: var(--text);
  display: block;
}

.metric-item span {
  color: var(--muted);
  font-size: 12px;
}

/* ── Video frame ── */
.video-frame {
  margin-top: 48px;
  border: 1px solid var(--border);
  border-radius: 12px;
  overflow: hidden;
  background: var(--surface);
}

.video-header {
  padding: 16px 24px;
  border-bottom: 1px solid var(--border);
  display: flex;
  align-items: center;
  gap: 10px;
}

.video-dots {
  display: flex;
  gap: 6px;
}

.dot {
  width: 10px;
  height: 10px;
  border-radius: 50%;
  background: var(--border);
}

.video-title {
  font-family: var(--mono);
  font-size: 11px;
  color: var(--muted);
  letter-spacing: 0.08em;
  margin-left: 8px;
}

.video-body {
  aspect-ratio: 16/9;
  background: #02060f;
  display: flex;
  align-items: center;
  justify-content: center;
  flex-direction: column;
  gap: 16px;
  position: relative;
  overflow: hidden;
}

.video-body::before {
  content: '';
  position: absolute;
  inset: 0;
  background: radial-gradient(ellipse at center, rgba(var(--accent-rgb), 0.04) 0%, transparent 70%);
}

.play-btn {
  width: 64px;
  height: 64px;
  border-radius: 50%;
  border: 2px solid rgba(var(--accent-rgb), 0.3);
  display: flex;
  align-items: center;
  justify-content: center;
  color: var(--accent);
  font-size: 22px;
  cursor: pointer;
  transition: border-color 0.2s, background 0.2s;
  position: relative;
  z-index: 1;
}

.play-btn:hover {
  border-color: var(--accent);
  background: rgba(var(--accent-rgb), 0.06);
}

.video-caption {
  font-family: var(--mono);
  font-size: 11px;
  color: var(--muted);
  letter-spacing: 0.06em;
  position: relative;
  z-index: 1;
}

/* ── Result frame (hierarchy chart) ── */
.result-frame {
  margin-top: 24px;
  border: 1px solid var(--border);
  border-radius: 12px;
  overflow: hidden;
  background: var(--surface);
}

.result-header {
  padding: 20px 28px;
  border-bottom: 1px solid var(--border);
  display: flex;
  align-items: center;
  justify-content: space-between;
}

.result-header span {
  font-family: var(--mono);
  font-size: 11px;
  color: var(--muted);
  letter-spacing: 0.06em;
}

.result-header .tag {
  font-family: var(--mono);
  font-size: 10px;
  color: var(--accent);
  background: rgba(var(--accent-rgb), 0.08);
  padding: 4px 10px;
  border-radius: 100px;
  border: 1px solid rgba(var(--accent-rgb), 0.2);
  letter-spacing: 0.1em;
  text-transform: uppercase;
}

.result-body {
  padding: 36px 40px;
}

.chart-area {
  background: #02060f;
  border-radius: 8px;
  padding: 32px;
  display: flex;
  align-items: flex-end;
  gap: 10px;
  height: 160px;
  position: relative;
  overflow: hidden;
}

.chart-area::before {
  content: '';
  position: absolute;
  inset: 0;
  background:
    repeating-linear-gradient(0deg, transparent, transparent 31px, rgba(var(--accent-rgb), 0.04) 31px, rgba(var(--accent-rgb), 0.04) 32px);
}

.chart-bar {
  flex: 1;
  border-radius: 3px 3px 0 0;
  position: relative;
  z-index: 1;
  transition: opacity 0.2s;
}

.chart-bar:hover {
  opacity: 0.8;
}

.result-caption {
  margin-top: 20px;
  font-size: 13px;
  color: var(--muted);
  line-height: 1.65;
}

.result-caption strong {
  color: var(--text);
}

/* ── Stats bar ── */
.stats-bar {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 1px;
  background: var(--border);
  border: 1px solid var(--border);
  border-radius: 12px;
  overflow: hidden;
  margin-bottom: 48px;
}

.stat {
  background: var(--bg2);
  padding: 40px 36px;
  text-align: center;
}

.stat-num {
  font-family: var(--mono);
  font-size: 42px;
  font-weight: 300;
  color: var(--accent);
  letter-spacing: -0.02em;
  line-height: 1;
  margin-bottom: 10px;
}

.stat-label {
  font-size: 13px;
  color: var(--muted);
}

/* ── Validation / feature cards ── */
.validation-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 24px;
}

.validation-card {
  border: 1px solid var(--border);
  border-radius: 12px;
  padding: 40px;
  background: var(--surface);
  position: relative;
  overflow: hidden;
}

.validation-card::before {
  content: '';
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  height: 3px;
  background: linear-gradient(90deg, var(--accent), transparent);
}

.val-icon {
  font-size: 28px;
  margin-bottom: 20px;
  display: block;
}

.validation-card h3 {
  font-size: 16px;
  font-weight: 600;
  margin-bottom: 12px;
}

.validation-card p {
  font-size: 14px;
  color: var(--muted);
  line-height: 1.7;
}

/* ── Paradigm table (MouseScope) ── */
.paradigm-table {
  width: 100%;
  border-collapse: collapse;
  border: 1px solid var(--border);
  border-radius: 12px;
  overflow: hidden;
}

.paradigm-table thead tr {
  background: var(--surface);
}

.paradigm-table th {
  padding: 16px 24px;
  text-align: left;
  font-size: 12px;
  font-weight: 600;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  color: var(--muted);
  border-bottom: 1px solid var(--border);
}

.paradigm-table td {
  padding: 20px 24px;
  font-size: 14px;
  border-bottom: 1px solid var(--border);
  vertical-align: top;
}

.paradigm-table tr:last-child td {
  border-bottom: none;
}

.paradigm-table tbody tr {
  background: var(--bg2);
  transition: background 0.15s;
}

.paradigm-table tbody tr:hover {
  background: var(--surface);
}

.paradigm-name {
  font-weight: 600;
  color: var(--text);
  display: block;
  margin-bottom: 4px;
}

.paradigm-abbr {
  font-family: var(--mono);
  font-size: 10px;
  color: var(--accent);
  letter-spacing: 0.1em;
  background: var(--accent-dim);
  padding: 2px 8px;
  border-radius: 4px;
  border: 1px solid rgba(var(--accent-rgb), 0.2);
}

/* ── Paradigm Grid ── */
.paradigm-showcase {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 24px;
  margin-bottom: 24px;
}

.paradigm-grid-small {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 24px;
}

.paradigm-card {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: 12px;
  overflow: hidden;
  display: flex;
  flex-direction: column;
}

.paradigm-card-media {
  width: 100%;
  border-bottom: 1px solid var(--border);
  background: #000;
  display: block;
}

.paradigm-card-img {
  width: 100%;
  display: block;
  object-fit: contain;
}

.paradigm-card-body {
  padding: 24px;
  display: flex;
  flex-direction: column;
  flex: 1;
}

.paradigm-card-head {
  display: flex;
  align-items: center;
  justify-content: space-between;
  margin-bottom: 16px;
}

.paradigm-card-title {
  font-size: 16px;
  font-weight: 600;
  color: var(--text);
  margin: 0;
}

.paradigm-app {
  font-size: 14px;
  color: var(--muted);
  line-height: 1.6;
  margin-bottom: 16px;
}

.paradigm-metrics {
  margin-top: auto;
}

.paradigm-metrics .metric-label {
  font-family: var(--mono);
  font-size: 11px;
  color: var(--accent);
  text-transform: uppercase;
  letter-spacing: 0.1em;
  margin-bottom: 8px;
  display: block;
}

.metric-tags {
  display: flex;
  flex-wrap: wrap;
  gap: 6px;
}

.metric-tag {
  font-family: var(--mono);
  font-size: 11px;
  color: var(--muted);
  background: rgba(var(--accent-rgb), 0.04);
  border: 1px solid var(--border);
  padding: 3px 8px;
}

.paradigm-img-group {
  display: flex;
  gap: 8px;
  margin-top: 12px;
}

.paradigm-img {
  width: 100%;
  max-width: 160px;
  border-radius: 6px;
  border: 1px solid var(--border);
  display: block;
}

.validation-card img {
  width: 100%;
  border-radius: 8px;
  border: 1px solid var(--border);
  margin-bottom: 20px;
  background: #fff;
}
  border-radius: 4px;
}

.app-text {
  font-size: 13px;
  color: var(--muted);
  line-height: 1.6;
}

/* ── Workflow (MouseScope) ── */
.workflow {
  display: flex;
  flex-direction: column;
  gap: 1px;
  background: var(--border);
  border: 1px solid var(--border);
  border-radius: 12px;
  overflow: hidden;
}

.workflow-step {
  background: var(--bg2);
  padding: 32px 40px;
  display: grid;
  grid-template-columns: 72px 1fr;
  gap: 32px;
  align-items: start;
  transition: background 0.15s;
}

.workflow-step:hover {
  background: var(--surface);
}

.step-num-large {
  font-family: var(--mono);
  font-size: 36px;
  font-weight: 300;
  color: rgba(var(--accent-rgb), 0.25);
  line-height: 1;
  text-align: right;
  padding-top: 4px;
}

.step-content h3 {
  font-size: 16px;
  font-weight: 600;
  margin-bottom: 8px;
}

.step-content p {
  font-size: 14px;
  color: var(--muted);
  line-height: 1.65;
}

/* ── Output grid (MouseScope) ── */
.output-grid {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 16px;
}

.output-card {
  border: 1px solid var(--border);
  border-radius: 12px;
  padding: 32px;
  background: var(--surface);
  display: flex;
  gap: 20px;
  align-items: flex-start;
  transition: border-color 0.2s;
}

.output-card:hover {
  border-color: rgba(var(--accent-rgb), 0.25);
}

.output-icon {
  width: 40px;
  height: 40px;
  background: var(--accent-dim);
  border: 1px solid rgba(var(--accent-rgb), 0.2);
  border-radius: 8px;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 17px;
  flex-shrink: 0;
}

.output-info h3 {
  font-size: 14px;
  font-weight: 600;
  margin-bottom: 6px;
}

.output-info .filename {
  font-family: var(--mono);
  font-size: 11px;
  color: var(--accent);
  margin-bottom: 8px;
  letter-spacing: 0.04em;
}

.output-info p {
  font-size: 13px;
  color: var(--muted);
  line-height: 1.6;
}

/* ── Specs table ── */
.specs-table {
  width: 100%;
  border-collapse: collapse;
  border: 1px solid var(--border);
  border-radius: 12px;
  overflow: hidden;
}

.specs-table tr {
  border-bottom: 1px solid var(--border);
}

.specs-table tr:last-child {
  border-bottom: none;
}

.specs-table tr:nth-child(odd) td {
  background: var(--surface);
}

.specs-table tr:nth-child(even) td {
  background: var(--bg2);
}

.specs-table td {
  padding: 18px 28px;
  font-size: 14px;
  vertical-align: top;
}

.specs-table td:first-child {
  font-family: var(--mono);
  font-size: 12px;
  color: var(--muted);
  letter-spacing: 0.06em;
  width: 200px;
  border-right: 1px solid var(--border);
}

.specs-table td:last-child {
  color: var(--text);
}

/* ── Advantages grid (MouseScope) ── */
.advantages-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 1px;
  background: var(--border);
  border: 1px solid var(--border);
  border-radius: 12px;
  overflow: hidden;
}

.adv-card {
  background: var(--bg2);
  padding: 40px 32px;
  position: relative;
  overflow: hidden;
}

.adv-card::before {
  content: '';
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  height: 2px;
  background: linear-gradient(90deg, var(--accent), transparent);
}

.adv-icon {
  font-size: 22px;
  margin-bottom: 16px;
  display: block;
}

.adv-card h3 {
  font-size: 15px;
  font-weight: 600;
  margin-bottom: 10px;
}

.adv-card p {
  font-size: 13px;
  color: var(--muted);
  line-height: 1.65;
}

/* ── Product cards (landing) ── */
.product-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 24px;
}

.product-card {
  border: 1px solid var(--border);
  border-radius: 16px;
  padding: 40px 36px;
  background: var(--surface);
  display: flex;
  flex-direction: column;
  gap: 20px;
  text-decoration: none;
  color: inherit;
  position: relative;
  overflow: hidden;
  transition: border-color 0.2s, transform 0.2s;
}

.product-card::before {
  content: '';
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  height: 3px;
  background: linear-gradient(90deg, var(--card-accent, var(--accent)), transparent);
}

.product-card:hover {
  border-color: rgba(var(--accent-rgb), 0.3);
  transform: translateY(-4px);
}

.product-role {
  font-family: var(--mono);
  font-size: 10px;
  letter-spacing: 0.14em;
  text-transform: uppercase;
  color: var(--card-accent, var(--accent));
}

.product-card h3 {
  font-size: 24px;
  font-weight: 700;
  letter-spacing: -0.01em;
  line-height: 1.2;
}

.product-tagline {
  font-size: 15px;
  color: var(--muted);
  line-height: 1.65;
  flex: 1;
}

.product-meta {
  font-family: var(--mono);
  font-size: 11px;
  color: var(--muted);
  letter-spacing: 0.06em;
  padding-top: 16px;
  border-top: 1px solid var(--border);
}

.product-arrow {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  font-size: 13px;
  font-weight: 500;
  color: var(--card-accent, var(--accent));
  margin-top: 4px;
}

.product-card.card-blue {
  --card-accent: #38bdf8;
}

.product-card.card-green {
  --card-accent: #34d399;
}

.product-card.card-violet {
  --card-accent: #a78bfa;
}

/* ── Narrative flow (landing) ── */
.flow-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 1px;
  background: var(--border);
  border: 1px solid var(--border);
  border-radius: 12px;
  overflow: hidden;
}

.flow-step {
  background: var(--bg2);
  padding: 40px 32px;
}

.flow-stage {
  font-family: var(--mono);
  font-size: 10px;
  letter-spacing: 0.14em;
  text-transform: uppercase;
  color: var(--accent);
  margin-bottom: 14px;
}

.flow-step h3 {
  font-size: 18px;
  font-weight: 600;
  margin-bottom: 10px;
  letter-spacing: -0.01em;
}

.flow-step p {
  font-size: 14px;
  color: var(--muted);
  line-height: 1.65;
  margin-bottom: 16px;
}

.flow-answer {
  font-family: var(--mono);
  font-size: 11px;
  letter-spacing: 0.06em;
  color: var(--muted);
  padding-top: 14px;
  border-top: 1px solid var(--border);
}

.flow-answer strong {
  color: var(--text);
  font-weight: 500;
}

/* ── About page ── */
.about-block {
  max-width: 760px;
  margin: 0 auto 56px;
  padding: 32px 36px;
  border: 1px solid var(--border);
  border-radius: 12px;
  background: var(--surface);
}

.about-block:last-child {
  margin-bottom: 0;
}

.about-en {
  font-size: 17px;
  color: var(--text);
  line-height: 1.75;
}

/* ── CTA ── */
#cta {
  padding: 120px 0;
}

.cta-inner {
  border: 1px solid var(--border);
  border-radius: 16px;
  padding: 80px;
  background: var(--surface);
  text-align: center;
  position: relative;
  overflow: hidden;
}

.cta-inner::before {
  content: '';
  position: absolute;
  top: -100px;
  left: 50%;
  transform: translateX(-50%);
  width: 400px;
  height: 400px;
  background: radial-gradient(ellipse, rgba(var(--accent-rgb), 0.06) 0%, transparent 70%);
  pointer-events: none;
}

.cta-inner h2 {
  margin-bottom: 16px;
  position: relative;
  z-index: 1;
}

.cta-inner p {
  font-size: 16px;
  color: var(--muted);
  max-width: 480px;
  margin: 0 auto 40px;
  position: relative;
  z-index: 1;
}

.cta-buttons {
  display: flex;
  gap: 16px;
  justify-content: center;
  flex-wrap: wrap;
  position: relative;
  z-index: 1;
}

.cta-note,
.pricing-note {
  margin-top: 28px;
  font-family: var(--mono);
  font-size: 12px;
  color: var(--muted);
  letter-spacing: 0.04em;
  position: relative;
  z-index: 1;
}

/* ── Footer ── */
footer {
  border-top: 1px solid var(--border);
  padding: 40px 48px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 24px;
  position: relative;
  z-index: 1;
  flex-wrap: wrap;
}

.footer-logo {
  font-family: var(--mono);
  font-size: 12px;
  color: var(--muted);
  letter-spacing: 0.08em;
}

.footer-links {
  display: flex;
  gap: 24px;
  list-style: none;
}

.footer-links a {
  font-size: 12px;
  color: var(--muted);
  text-decoration: none;
  letter-spacing: 0.04em;
  transition: color 0.2s;
}

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

.footer-note {
  font-size: 12px;
  color: var(--muted);
}

.footer-note a {
  color: var(--accent);
  text-decoration: none;
}

/* ── Animations ── */
@keyframes fadeUp {
  from {
    opacity: 0;
    transform: translateY(20px);
  }

  to {
    opacity: 1;
    transform: translateY(0);
  }
}

.reveal {
  opacity: 0;
  transform: translateY(24px);
  transition: opacity 0.7s, transform 0.7s;
}

.reveal.visible {
  opacity: 1;
  transform: none;
}

/* ── Responsive ── */
@media (max-width: 768px) {
  nav {
    padding: 0 24px;
  }

  .container,
  .hero-inner {
    padding: 0 24px;
  }

  .problem-grid {
    grid-template-columns: 1fr;
  }

  .problem-body {
    grid-template-columns: 1fr;
  }

  .steps {
    grid-template-columns: 1fr;
  }

  .metrics-grid {
    grid-template-columns: 1fr;
  }

  .validation-grid {
    grid-template-columns: 1fr;
  }

  .stats-bar {
    grid-template-columns: 1fr;
  }

  .output-grid {
    grid-template-columns: 1fr;
  }

  .advantages-grid {
    grid-template-columns: 1fr;
  }

  .product-grid {
    grid-template-columns: 1fr;
  }

  .flow-grid {
    grid-template-columns: 1fr;
  }

  .cta-inner {
    padding: 48px 32px;
  }

  footer {
    flex-direction: column;
    gap: 12px;
    text-align: center;
    justify-content: center;
  }

  .footer-links {
    justify-content: center;
    flex-wrap: wrap;
  }

  .nav-links,
  .nav-products {
    display: none;
  }

  .divider {
    margin: 0 24px;
  }

  .paradigm-table {
    font-size: 13px;
  }

  .paradigm-table th,
  .paradigm-table td {
    padding: 14px 16px;
  }
}