/* ═══════════════════════════════════════════════════════════════
   SimDiag — Stylesheet v2
   Paleta: Fundo carbono (#080C14) · Azul ativo (#2B8EFF) 
           Verde confirmação (#00D4A0) · Vermelho alerta (#F25C6E)
           Âmbar aviso (#F5A623) · Cinza dados (#6B7A99)
   Tipografia: Sora (display) · Inter (corpo) · JetBrains Mono (dados)
   Assinatura: Monitor cardíaco pulsante no hero + scan line nos cards
═══════════════════════════════════════════════════════════════ */

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

:root {
  /* Fundos */
  --bg-deep:      #080C14;
  --bg-mid:       #0D1220;
  --bg-card:      #111827;
  --bg-card-alt:  #0F1520;
  --bg-input:     #0A0F1C;

  /* Cores de ação */
  --blue:         #2B8EFF;
  --blue-glow:    rgba(43, 142, 255, 0.18);
  --blue-border:  rgba(43, 142, 255, 0.28);
  --blue-light:   #6DB3FF;

  /* Semântica clínica */
  --green:        #00D4A0;
  --green-glow:   rgba(0, 212, 160, 0.12);
  --green-border: rgba(0, 212, 160, 0.3);
  --red:          #F25C6E;
  --red-glow:     rgba(242, 92, 110, 0.12);
  --red-border:   rgba(242, 92, 110, 0.3);
  --amber:        #F5A623;

  /* Texto */
  --text:         #E8EDF8;
  --text-muted:   #6B7A99;
  --text-dim:     #3A4560;

  /* Bordas */
  --border:       rgba(255, 255, 255, 0.06);
  --border-mid:   rgba(255, 255, 255, 0.1);

  /* Tipografia */
  --font-display: 'Sora', sans-serif;
  --font-body:    'Inter', sans-serif;
  --font-mono:    'JetBrains Mono', monospace;

  /* Geometria */
  --radius-sm:    8px;
  --radius-md:    14px;
  --radius-lg:    20px;
  --radius-xl:    28px;
}

/* ─── Reset & Base ──────────────────────────────────────────── */
html { scroll-behavior: smooth; }

body {
  font-family: var(--font-body);
  background: var(--bg-deep);
  color: var(--text);
  line-height: 1.6;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
  overflow-x: hidden;
}

::-webkit-scrollbar { width: 5px; }
::-webkit-scrollbar-track { background: var(--bg-deep); }
::-webkit-scrollbar-thumb { background: var(--blue); border-radius: 3px; }

/* ═══════════════════════════ NAV ═════════════════════════════ */
.nav {
  position: fixed; top: 0; left: 0; right: 0; z-index: 200;
  height: 58px;
  background: rgba(8, 12, 20, 0.9);
  backdrop-filter: blur(20px) saturate(180%);
  -webkit-backdrop-filter: blur(20px) saturate(180%);
  border-bottom: 1px solid var(--border);
}

.nav-inner {
  max-width: 1120px; margin: 0 auto;
  height: 100%;
  display: flex; align-items: center; justify-content: space-between;
  padding: 0 28px;
}

.logo {
  display: flex; align-items: center; gap: 10px;
  text-decoration: none; color: var(--text);
  font-family: var(--font-display);
  font-weight: 700; font-size: 1.05rem; letter-spacing: -0.02em;
}

.logo-mark {
  width: 30px; height: 30px;
  background: var(--blue);
  border-radius: 7px;
  display: grid; place-items: center;
  font-size: 0.9rem;
  box-shadow: 0 0 16px rgba(43, 142, 255, 0.4);
  flex-shrink: 0;
}

.nav-links {
  display: flex; gap: 36px; align-items: center;
}

.nav-links a {
  color: var(--text-muted); text-decoration: none;
  font-size: 0.855rem; font-weight: 500;
  transition: color 0.2s;
  position: relative;
}

.nav-links a::after {
  content: '';
  position: absolute; bottom: -3px; left: 0; right: 0;
  height: 1px; background: var(--blue);
  transform: scaleX(0); transition: transform 0.2s;
}

.nav-links a:hover { color: var(--text); }
.nav-links a:hover::after { transform: scaleX(1); }

/* ═══════════════════════════ HERO ════════════════════════════ */
.hero {
  position: relative;
  min-height: 100vh;
  display: grid;
  grid-template-columns: 1fr 1fr;
  align-items: center;
  gap: 48px;
  padding: 100px 28px 72px;
  max-width: 1120px;
  margin: 0 auto;
}

/* Grid de fundo radial */
.hero::before {
  content: '';
  position: fixed; inset: 0; z-index: -2;
  background:
    radial-gradient(ellipse 700px 500px at 15% 50%, rgba(43,142,255,0.06) 0%, transparent 70%),
    radial-gradient(ellipse 500px 400px at 85% 30%, rgba(0,212,160,0.04) 0%, transparent 70%);
  pointer-events: none;
}

/* Linha de scan sutil no fundo */
.hero-scanlines {
  position: absolute; inset: 0; z-index: 0; pointer-events: none;
  background: repeating-linear-gradient(
    0deg,
    transparent,
    transparent 3px,
    rgba(255,255,255,0.008) 3px,
    rgba(255,255,255,0.008) 4px
  );
  border-radius: 0;
}

.hero-left {
  position: relative; z-index: 1;
}

.hero-eyebrow {
  display: inline-flex; align-items: center; gap: 8px;
  font-family: var(--font-mono); font-size: 0.72rem;
  color: var(--blue-light); letter-spacing: 0.1em; text-transform: uppercase;
  margin-bottom: 24px;
}

.hero-eyebrow-dot {
  width: 6px; height: 6px; border-radius: 50%;
  background: var(--green);
  animation: blink 2s ease-in-out infinite;
}

@keyframes blink {
  0%, 100% { opacity: 1; }
  50% { opacity: 0.2; }
}

.hero-title {
  font-family: var(--font-display);
  font-size: clamp(2.4rem, 4.5vw, 3.8rem);
  font-weight: 800;
  letter-spacing: -0.04em;
  line-height: 1.05;
  margin-bottom: 22px;
}

.hero-title em {
  font-style: normal;
  color: transparent;
  background: linear-gradient(135deg, var(--blue-light) 0%, var(--green) 100%);
  -webkit-background-clip: text;
  background-clip: text;
}

.hero-subtitle {
  font-size: 1rem; color: var(--text-muted);
  max-width: 460px; line-height: 1.75;
  margin-bottom: 36px;
}

.hero-subtitle strong {
  color: var(--text); font-weight: 600;
}

.hero-actions {
  display: flex; gap: 12px; flex-wrap: wrap;
  margin-bottom: 52px;
}

.btn-primary {
  display: inline-flex; align-items: center; gap: 8px;
  background: var(--blue); color: #fff;
  padding: 12px 26px; border-radius: var(--radius-sm);
  text-decoration: none; font-weight: 600; font-size: 0.9rem;
  font-family: var(--font-body);
  transition: background 0.2s, box-shadow 0.2s, transform 0.15s;
  box-shadow: 0 4px 20px rgba(43,142,255,0.3);
}

.btn-primary:hover {
  background: #4AA2FF;
  box-shadow: 0 6px 28px rgba(43,142,255,0.45);
  transform: translateY(-1px);
}

.btn-outline {
  display: inline-flex; align-items: center; gap: 8px;
  border: 1px solid var(--border-mid); color: var(--text-muted);
  padding: 12px 26px; border-radius: var(--radius-sm);
  text-decoration: none; font-weight: 500; font-size: 0.9rem;
  transition: border-color 0.2s, color 0.2s;
}

.btn-outline:hover { border-color: var(--blue); color: var(--text); }

.hero-metrics {
  display: flex; gap: 0;
  border: 1px solid var(--border);
  border-radius: var(--radius-md);
  overflow: hidden;
  background: var(--bg-card);
  width: fit-content;
}

.hero-metric {
  padding: 14px 24px;
  border-right: 1px solid var(--border);
  display: flex; flex-direction: column; gap: 2px;
}

.hero-metric:last-child { border-right: none; }

.metric-val {
  font-family: var(--font-mono);
  font-size: 1.4rem; font-weight: 600;
  color: var(--blue-light); line-height: 1;
}

.metric-lbl {
  font-size: 0.68rem; color: var(--text-dim);
  text-transform: uppercase; letter-spacing: 0.06em;
}

/* Hero — painel visual direito */
.hero-right {
  position: relative; z-index: 1;
  display: flex; align-items: center; justify-content: center;
}

.monitor-frame {
  width: 100%;
  max-width: 440px;
  background: var(--bg-card);
  border: 1px solid var(--border-mid);
  border-radius: var(--radius-lg);
  overflow: hidden;
  box-shadow:
    0 0 60px rgba(43,142,255,0.08),
    0 24px 80px rgba(0,0,0,0.5);
}

.monitor-header {
  display: flex; align-items: center; justify-content: space-between;
  padding: 12px 16px;
  background: rgba(255,255,255,0.03);
  border-bottom: 1px solid var(--border);
}

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

.monitor-dot {
  width: 10px; height: 10px; border-radius: 50%;
}

.monitor-dot:nth-child(1) { background: #FF5F57; }
.monitor-dot:nth-child(2) { background: #FEBC2E; }
.monitor-dot:nth-child(3) { background: #28C840; }

.monitor-title {
  font-family: var(--font-mono); font-size: 0.7rem;
  color: var(--text-dim); letter-spacing: 0.05em;
}

.monitor-status {
  display: flex; align-items: center; gap: 6px;
  font-family: var(--font-mono); font-size: 0.68rem; color: var(--green);
}

.monitor-status-dot {
  width: 6px; height: 6px; border-radius: 50%;
  background: var(--green);
  animation: blink 1.5s ease-in-out infinite;
}

/* ECG display */
.ecg-screen {
  padding: 20px 16px 8px;
  background: linear-gradient(180deg, #060A12 0%, #0A0F1C 100%);
}

.ecg-label {
  font-family: var(--font-mono); font-size: 0.62rem;
  color: rgba(0,212,160,0.5); margin-bottom: 4px;
  letter-spacing: 0.08em;
}

.ecg-wrap { overflow: hidden; }

.ecg-svg { width: 100%; display: block; }

.ecg-line {
  stroke: var(--green); stroke-width: 2;
  fill: none; stroke-linecap: round; stroke-linejoin: round;
  filter: drop-shadow(0 0 4px rgba(0,212,160,0.6));
  stroke-dasharray: 1200;
  stroke-dashoffset: 1200;
  animation: ecgDraw 2.8s cubic-bezier(0.4, 0, 0.2, 1) forwards 0.8s;
}

@keyframes ecgDraw { to { stroke-dashoffset: 0; } }

/* Vitals grid dentro do monitor */
.vitals-grid {
  display: grid; grid-template-columns: 1fr 1fr 1fr;
  gap: 1px; background: var(--border);
  border-top: 1px solid var(--border);
}

.vital {
  background: var(--bg-card-alt);
  padding: 14px 12px;
  display: flex; flex-direction: column; gap: 3px;
}

.vital-lbl {
  font-family: var(--font-mono); font-size: 0.58rem;
  color: var(--text-dim); letter-spacing: 0.08em; text-transform: uppercase;
}

.vital-val {
  font-family: var(--font-mono); font-size: 1.1rem; font-weight: 500;
  line-height: 1;
}

.vital-val.ok    { color: var(--green); }
.vital-val.warn  { color: var(--amber); }
.vital-val.alert { color: var(--red); }

.vital-unit {
  font-family: var(--font-mono); font-size: 0.58rem; color: var(--text-dim);
}

/* Diagnóstico pendente dentro do monitor */
.monitor-diagnose-row {
  padding: 14px 16px;
  border-top: 1px solid var(--border);
  display: flex; align-items: center; justify-content: space-between;
}

.monitor-diagnose-status {
  font-family: var(--font-mono); font-size: 0.7rem; color: var(--text-muted);
}

.monitor-bar {
  height: 4px; background: var(--border);
  border-radius: 2px; flex: 1; margin-left: 16px;
  overflow: hidden;
}

.monitor-bar-fill {
  height: 100%; background: linear-gradient(90deg, var(--blue), var(--green));
  border-radius: 2px;
  animation: barLoad 2.5s ease-out forwards 0.8s;
  width: 0;
}

@keyframes barLoad { to { width: 100%; } }

/* ═══════════════════════ SEÇÕES GERAIS ═══════════════════════ */
.section { padding: 96px 28px; }

.section-alt {
  background: var(--bg-mid);
  border-top: 1px solid var(--border);
  border-bottom: 1px solid var(--border);
}

.container { max-width: 1120px; margin: 0 auto; }

.section-header { margin-bottom: 52px; }

.section-eyebrow {
  font-family: var(--font-mono); font-size: 0.7rem; font-weight: 500;
  letter-spacing: 0.12em; text-transform: uppercase;
  color: var(--blue); margin-bottom: 12px;
  display: flex; align-items: center; gap: 10px;
}

.section-eyebrow::before {
  content: '';
  display: block; width: 20px; height: 1px; background: var(--blue);
}

.section-title {
  font-family: var(--font-display);
  font-size: clamp(1.9rem, 3vw, 2.8rem);
  font-weight: 700; letter-spacing: -0.03em;
  line-height: 1.15; margin-bottom: 14px;
}

.section-desc {
  font-size: 1rem; color: var(--text-muted);
  max-width: 560px; line-height: 1.75;
}

/* ═══════════════════════ COMO FUNCIONA ══════════════════════ */
.chain-flow {
  display: grid;
  grid-template-columns: 1fr auto 1fr auto 1fr;
  align-items: start;
  gap: 8px;
  margin-bottom: 60px;
}

.chain-connector {
  display: flex; align-items: center; justify-content: center;
  padding-top: 32px;
}

.chain-connector-line {
  display: flex; align-items: center; gap: 0;
}

.connector-dot {
  width: 6px; height: 6px; border-radius: 50%;
  background: var(--blue); flex-shrink: 0;
}

.connector-body {
  width: 40px; height: 2px;
  background: linear-gradient(90deg, var(--blue), rgba(43,142,255,0.3));
}

.chain-card {
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: var(--radius-md);
  padding: 22px;
  position: relative;
  transition: border-color 0.25s, box-shadow 0.25s;
}

.chain-card:hover {
  border-color: var(--blue-border);
  box-shadow: 0 8px 32px rgba(43,142,255,0.08);
}

.chain-step {
  font-family: var(--font-mono); font-size: 0.65rem; font-weight: 500;
  color: var(--blue); background: var(--blue-glow);
  border: 1px solid var(--blue-border);
  border-radius: 4px; padding: 2px 8px;
  display: inline-block; margin-bottom: 12px;
  letter-spacing: 0.06em;
}

.chain-name {
  font-family: var(--font-display);
  font-weight: 700; font-size: 1rem; margin-bottom: 14px;
}

.chain-features { display: flex; flex-wrap: wrap; gap: 6px; }

.feat-tag {
  font-family: var(--font-mono); font-size: 0.65rem;
  padding: 3px 10px; border-radius: 100px;
  background: rgba(255,255,255,0.04);
  border: 1px solid var(--border);
  color: var(--text-muted);
}

.feat-tag.pred {
  background: var(--blue-glow);
  border-color: var(--blue-border);
  color: var(--blue-light);
}

.chain-output {
  font-family: var(--font-mono); font-size: 0.65rem;
  color: var(--text-dim); margin-top: 14px;
  padding-top: 12px; border-top: 1px solid var(--border);
}

.chain-output.terminal { color: var(--green); }

/* Cartões de conceito */
.concepts {
  display: grid; grid-template-columns: repeat(3, 1fr); gap: 20px;
}

.concept-card {
  background: var(--bg-card-alt);
  border: 1px solid var(--border);
  border-radius: var(--radius-md);
  padding: 24px 22px;
  transition: border-color 0.2s, transform 0.2s;
}

.concept-card:hover {
  border-color: var(--border-mid);
  transform: translateY(-2px);
}

.concept-icon {
  width: 42px; height: 42px; border-radius: var(--radius-sm);
  background: var(--bg-card);
  border: 1px solid var(--border);
  display: grid; place-items: center;
  font-size: 1.2rem; margin-bottom: 16px;
}

.concept-title { font-weight: 600; font-size: 0.95rem; margin-bottom: 8px; }
.concept-text  { font-size: 0.85rem; color: var(--text-muted); line-height: 1.65; }

/* ═══════════════════════ SIMULADOR ══════════════════════════ */
.sim-shell {
  background: var(--bg-card);
  border: 1px solid var(--border-mid);
  border-radius: var(--radius-xl);
  overflow: hidden;
  box-shadow: 0 24px 80px rgba(0,0,0,0.4), 0 0 0 1px var(--border);
}

/* Barra de status de treinamento */
.train-bar {
  display: flex; align-items: center; gap: 12px;
  padding: 12px 24px;
  background: rgba(43,142,255,0.06);
  border-bottom: 1px solid rgba(43,142,255,0.15);
  font-family: var(--font-mono); font-size: 0.78rem; color: var(--blue-light);
  transition: opacity 0.4s;
}

.train-bar.hidden { display: none; }

.train-spinner {
  width: 13px; height: 13px;
  border: 2px solid rgba(43,142,255,0.2);
  border-top-color: var(--blue);
  border-radius: 50%;
  animation: spin 0.8s linear infinite; flex-shrink: 0;
}

@keyframes spin { to { transform: rotate(360deg); } }

.train-bar.done {
  background: rgba(0,212,160,0.06);
  border-color: rgba(0,212,160,0.2);
}
.train-bar.done .train-spinner {
  border-color: var(--green); border-top-color: transparent;
  animation: none;
}
.train-bar.done span { color: var(--green); }

/* Header do simulador */
.sim-topbar {
  display: flex; align-items: center; justify-content: space-between;
  padding: 20px 28px 0;
}

.sim-topbar-title {
  font-family: var(--font-mono); font-size: 0.72rem; color: var(--text-dim);
  letter-spacing: 0.1em; text-transform: uppercase;
}

.sim-topbar-badge {
  font-family: var(--font-mono); font-size: 0.68rem;
  color: var(--blue-light); background: var(--blue-glow);
  border: 1px solid var(--blue-border);
  padding: 3px 10px; border-radius: 100px;
}

/* Formulário */
.sim-form { padding: 20px 28px 28px; }

.sim-grid {
  display: grid;
  grid-template-columns: repeat(5, 1fr);
  gap: 16px;
  margin-bottom: 20px;
}

.form-field { display: flex; flex-direction: column; gap: 6px; }

.field-label {
  font-size: 0.78rem; font-weight: 600;
  color: var(--text-muted); display: flex; align-items: center; gap: 6px;
}

.field-unit {
  font-family: var(--font-mono); font-size: 0.63rem;
  background: var(--bg-input); color: var(--blue-light);
  border: 1px solid var(--blue-border);
  padding: 2px 6px; border-radius: 4px;
  margin-left: auto;
}

.field-input {
  background: var(--bg-input);
  border: 1px solid var(--border-mid);
  border-radius: var(--radius-sm); color: var(--text);
  font-family: var(--font-mono); font-size: 1rem; font-weight: 500;
  padding: 10px 13px; outline: none;
  transition: border-color 0.2s, box-shadow 0.2s;
  -moz-appearance: textfield;
  width: 100%;
}
.field-input::-webkit-inner-spin-button,
.field-input::-webkit-outer-spin-button { -webkit-appearance: none; }

.field-input:focus {
  border-color: var(--blue);
  box-shadow: 0 0 0 3px rgba(43,142,255,0.12);
}

.field-input.error {
  border-color: var(--red);
  box-shadow: 0 0 0 3px rgba(242,92,110,0.1);
}

.field-hint {
  font-size: 0.63rem; color: var(--text-dim);
  font-family: var(--font-mono); line-height: 1.4;
}

/* Botão de diagnóstico */
.btn-diagnose-wrap {
  display: flex; align-items: flex-end;
}

.btn-diagnose {
  width: 100%; padding: 11px 16px;
  background: var(--blue);
  color: #fff; border: none; border-radius: var(--radius-sm);
  font-family: var(--font-display); font-size: 0.88rem; font-weight: 700;
  cursor: pointer;
  display: flex; align-items: center; justify-content: center; gap: 8px;
  transition: background 0.2s, transform 0.15s, box-shadow 0.2s;
  box-shadow: 0 4px 20px rgba(43,142,255,0.3);
  letter-spacing: -0.01em;
}

.btn-diagnose:hover:not(:disabled) {
  background: #4AA2FF;
  transform: translateY(-1px);
  box-shadow: 0 6px 24px rgba(43,142,255,0.45);
}

.btn-diagnose:disabled { opacity: 0.35; cursor: not-allowed; }

/* Painel de resultados */
.results-area {
  border-top: 1px solid var(--border);
  padding: 24px 28px 28px;
  background: linear-gradient(180deg, rgba(0,0,0,0.25) 0%, transparent 100%);
}

.results-header {
  display: flex; align-items: center; justify-content: space-between;
  margin-bottom: 18px;
}

.results-label {
  font-family: var(--font-mono); font-size: 0.68rem;
  letter-spacing: 0.1em; text-transform: uppercase; color: var(--text-dim);
}

.results-row {
  display: grid; grid-template-columns: repeat(3, 1fr); gap: 14px;
  margin-bottom: 16px;
}

.result-card {
  background: var(--bg-card-alt);
  border: 1px solid var(--border);
  border-radius: var(--radius-md);
  padding: 18px 16px;
  text-align: center;
  transition: border-color 0.3s, box-shadow 0.3s, transform 0.2s;
  position: relative; overflow: hidden;
}

/* scan line sutil nos result cards */
.result-card::after {
  content: '';
  position: absolute; top: 0; left: 0; right: 0;
  height: 1px;
  background: linear-gradient(90deg, transparent, var(--blue), transparent);
  opacity: 0;
  transition: opacity 0.3s;
}

.result-card.positive::after { background: linear-gradient(90deg, transparent, var(--red), transparent); opacity: 1; }
.result-card.negative::after { background: linear-gradient(90deg, transparent, var(--green), transparent); opacity: 1; }

.result-card.positive {
  border-color: var(--red-border);
  box-shadow: 0 0 32px var(--red-glow);
}

.result-card.negative {
  border-color: var(--green-border);
  box-shadow: 0 0 32px var(--green-glow);
}

.result-card.pulse { animation: pulse-up 0.35s ease; }

@keyframes pulse-up {
  0%   { transform: translateY(0) scale(1); }
  40%  { transform: translateY(-3px) scale(1.015); }
  100% { transform: translateY(0) scale(1); }
}

.result-icon { font-size: 1.5rem; margin-bottom: 6px; }
.result-name { font-weight: 600; font-size: 0.8rem; margin-bottom: 10px; color: var(--text-muted); }

.result-badge {
  display: inline-block;
  font-family: var(--font-mono); font-size: 0.7rem; font-weight: 700;
  letter-spacing: 0.04em;
  padding: 4px 12px; border-radius: 100px;
  background: rgba(255,255,255,0.05);
  color: var(--text-dim);
  transition: all 0.3s;
}

.result-card.positive .result-badge {
  background: var(--red-glow); color: var(--red);
  border: 1px solid var(--red-border);
}
.result-card.negative .result-badge {
  background: var(--green-glow); color: var(--green);
  border: 1px solid var(--green-border);
}

.result-detail {
  font-size: 0.65rem; color: var(--text-dim);
  font-family: var(--font-mono); margin-top: 7px; min-height: 14px;
}

.disclaimer {
  display: flex; align-items: flex-start; gap: 10px;
  font-size: 0.75rem; color: var(--text-dim);
  background: rgba(245,166,35,0.05);
  border: 1px solid rgba(245,166,35,0.12);
  padding: 10px 14px; border-radius: var(--radius-sm);
  line-height: 1.5;
}

.disclaimer-icon { flex-shrink: 0; font-size: 0.85rem; margin-top: 1px; }

/* ═══════════════════════════ SOBRE ══════════════════════════ */
.about-grid {
  display: grid; grid-template-columns: repeat(2, 1fr);
  gap: 1px; background: var(--border);
  border: 1px solid var(--border); border-radius: var(--radius-lg);
  overflow: hidden;
}

.about-item {
  background: var(--bg-card);
  padding: 30px 28px;
  display: flex; gap: 18px;
  transition: background 0.2s;
}

.about-item:hover { background: rgba(43,142,255,0.03); }

.about-num {
  font-family: var(--font-mono); font-size: 0.9rem; font-weight: 600;
  color: rgba(43,142,255,0.3); flex-shrink: 0; margin-top: 2px;
  letter-spacing: 0.02em;
}

.about-title { font-weight: 600; font-size: 0.95rem; margin-bottom: 8px; }
.about-body  { font-size: 0.855rem; color: var(--text-muted); line-height: 1.65; }

/* ═══════════════════════════ FOOTER ═════════════════════════ */
.footer {
  border-top: 1px solid var(--border);
  padding: 36px 28px;
}

.footer-inner {
  max-width: 1120px; margin: 0 auto;
  display: flex; align-items: center; justify-content: space-between;
  gap: 16px; flex-wrap: wrap;
}

.footer-brand {
  display: flex; align-items: center; gap: 10px;
  font-family: var(--font-display); font-weight: 700; font-size: 0.95rem;
}

.footer-note { font-size: 0.78rem; color: var(--text-dim); }
.footer-tech { font-family: var(--font-mono); font-size: 0.68rem; color: var(--text-dim); opacity: 0.5; }

/* ═══════════════════════════ RESPONSIVE ═════════════════════ */
@media (max-width: 1000px) {
  .hero {
    grid-template-columns: 1fr;
    padding-top: 90px;
  }
  .hero-right { display: none; }
  .chain-flow {
    grid-template-columns: 1fr;
    gap: 0;
  }
  .chain-connector { display: none; }
  .chain-card { border-radius: 0; }
  .chain-card:first-child { border-radius: var(--radius-md) var(--radius-md) 0 0; }
  .chain-card:last-child  { border-radius: 0 0 var(--radius-md) var(--radius-md); border-top: none; }
  .concepts { grid-template-columns: 1fr 1fr; }
  .sim-grid { grid-template-columns: repeat(3, 1fr); }
}

@media (max-width: 700px) {
  .nav-links  { display: none; }
  .hero       { padding: 82px 20px 56px; }
  .section    { padding: 64px 20px; }
  .sim-form   { padding: 16px 18px 22px; }
  .sim-topbar { padding: 16px 18px 0; }
  .results-area { padding: 20px 18px 22px; }
  .train-bar  { padding: 10px 18px; }
  .sim-grid   { grid-template-columns: 1fr 1fr; }
  .results-row { grid-template-columns: 1fr; }
  .concepts   { grid-template-columns: 1fr; }
  .about-grid { grid-template-columns: 1fr; }
  .footer-inner { flex-direction: column; align-items: center; text-align: center; }
  .hero-metrics { width: 100%; }
}

@media (max-width: 440px) {
  .sim-grid { grid-template-columns: 1fr; }
}

@media (prefers-reduced-motion: reduce) {
  .ecg-line  { animation: none; stroke-dashoffset: 0; }
  .train-spinner { animation: none; }
  .hero-eyebrow-dot { animation: none; }
  .monitor-bar-fill { animation: none; width: 100%; }
  .btn-primary:hover,
  .btn-diagnose:hover:not(:disabled),
  .info-card:hover,
  .concept-card:hover { transform: none; }
}