/* Kelvex Cooling Expert — Landing styles
   Mobile-first · Sin dependencias externas */

:root {
  --bg: #02060f;
  --bg2: #050d1f;
  --bg3: #081224;
  --panel: rgba(8, 18, 36, 0.62);
  --panel-hover: rgba(12, 28, 52, 0.78);
  --border: rgba(80, 180, 255, 0.14);
  --border2: rgba(80, 180, 255, 0.28);
  --accent: #00c8ff;
  --accent2: #4ec1ff;
  --accent3: #6edcff;
  --industrial: #1a4a8a;
  --text: #aac0d8;
  --text2: #c5d5e8;
  --text3: #5a7a9a;
  --white: #eef6ff;
  --dark: #0a1628;
  --grad: linear-gradient(135deg, #0080ff, #00c8ff);
  --grad-soft: linear-gradient(135deg, rgba(0, 128, 255, 0.18), rgba(0, 200, 255, 0.08));
  --shadow: 0 8px 32px rgba(0, 40, 80, 0.45);
  --shadow-glow: 0 0 40px rgba(0, 200, 255, 0.15);
  --max: 1180px;
  --pad: clamp(1.25rem, 5vw, 3.5rem);
  --radius: 14px;
  --radius-sm: 10px;
  --ease: cubic-bezier(0.22, 1, 0.36, 1);
  --font-display: "Segoe UI", system-ui, -apple-system, sans-serif;
  --font-body: system-ui, -apple-system, "Segoe UI", Roboto, sans-serif;
  --font-mono: "Cascadia Code", "Consolas", "Courier New", monospace;
  --header-h: 64px;
  --focus: #00c8ff;
}

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

html {
  scroll-behavior: smooth;
  -webkit-text-size-adjust: 100%;
}

body {
  font-family: var(--font-body);
  font-size: 1rem;
  line-height: 1.65;
  color: var(--text);
  background: var(--bg);
  overflow-x: hidden;
  -webkit-font-smoothing: antialiased;
}

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

a {
  color: var(--accent);
  text-decoration: none;
  transition: color 0.2s ease;
}

a:hover { color: var(--white); }

a:focus-visible,
button:focus-visible,
summary:focus-visible {
  outline: 2px solid var(--focus);
  outline-offset: 3px;
}

h1, h2, h3, h4 {
  font-family: var(--font-display);
  color: var(--white);
  letter-spacing: -0.02em;
  line-height: 1.15;
}

ul, ol { list-style: none; }

/* Skip link */
.skip-link {
  position: absolute;
  top: -100%;
  left: var(--pad);
  z-index: 200;
  padding: 0.75rem 1.25rem;
  background: var(--accent);
  color: var(--bg);
  font-weight: 700;
  border-radius: var(--radius-sm);
  transition: top 0.2s ease;
}

.skip-link:focus { top: 0.75rem; }

/* Background */
.bg-grid {
  position: fixed;
  inset: 0;
  z-index: 0;
  pointer-events: none;
  background-image:
    linear-gradient(rgba(0, 200, 255, 0.03) 1px, transparent 1px),
    linear-gradient(90deg, rgba(0, 200, 255, 0.03) 1px, transparent 1px);
  background-size: 48px 48px;
  mask-image: radial-gradient(ellipse 80% 70% at 50% 30%, black 20%, transparent 75%);
}

.bg-glow {
  position: fixed;
  inset: 0;
  z-index: 0;
  pointer-events: none;
  background:
    radial-gradient(ellipse 90% 55% at 15% 0%, rgba(26, 74, 138, 0.35), transparent 55%),
    radial-gradient(ellipse 70% 45% at 90% 25%, rgba(0, 200, 255, 0.12), transparent 50%),
    radial-gradient(ellipse 55% 40% at 50% 100%, rgba(0, 128, 255, 0.08), transparent 60%);
}

.page { position: relative; z-index: 1; }

/* Header */
.header {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  z-index: 100;
  height: var(--header-h);
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 0 var(--pad);
  background: rgba(5, 10, 20, 0.82);
  backdrop-filter: blur(18px);
  -webkit-backdrop-filter: blur(18px);
  border-bottom: 1px solid var(--border);
}

.brand {
  display: flex;
  align-items: center;
  gap: 0.75rem;
  color: inherit;
}

.brand:hover { color: inherit; }

.brand__mark {
  width: 2.375rem;
  height: 2.375rem;
  border-radius: 0.625rem;
  background: var(--grad);
  display: flex;
  align-items: center;
  justify-content: center;
  font-family: var(--font-display);
  font-weight: 800;
  font-size: 0.85rem;
  color: #001a26;
  box-shadow: 0 0 18px rgba(0, 200, 255, 0.35);
  flex-shrink: 0;
}

.brand__text { display: flex; flex-direction: column; }

.brand__name {
  font-family: var(--font-display);
  font-weight: 700;
  font-size: 1.05rem;
  color: var(--white);
  letter-spacing: 0.03em;
}

.brand__tag {
  font-size: 0.625rem;
  color: var(--accent);
  letter-spacing: 0.12em;
  text-transform: uppercase;
}

.nav { display: none; align-items: center; gap: 0.25rem; }

.nav a {
  color: var(--text);
  font-size: 0.8125rem;
  font-weight: 500;
  padding: 0.5rem 0.875rem;
  border-radius: 0.4375rem;
  transition: background 0.2s, color 0.2s;
}

.nav a:hover {
  color: var(--white);
  background: rgba(0, 200, 255, 0.07);
}

.nav__cta {
  margin-left: 0.5rem;
  padding: 0.5rem 1rem !important;
  background: rgba(0, 200, 255, 0.1);
  border: 1px solid var(--border2);
  color: var(--white) !important;
}

.nav__cta:hover {
  background: rgba(0, 200, 255, 0.18) !important;
  border-color: var(--accent);
}

.menu-btn {
  display: flex;
  align-items: center;
  justify-content: center;
  width: 2.5rem;
  height: 2.5rem;
  border: 1px solid var(--border2);
  border-radius: var(--radius-sm);
  background: rgba(0, 200, 255, 0.05);
  color: var(--white);
  cursor: pointer;
}

.menu-btn svg { width: 1.25rem; height: 1.25rem; }

.mobile-nav {
  position: fixed;
  top: var(--header-h);
  left: 0;
  right: 0;
  z-index: 99;
  padding: 1rem var(--pad) 1.5rem;
  background: rgba(5, 10, 20, 0.96);
  backdrop-filter: blur(20px);
  border-bottom: 1px solid var(--border);
  transform: translateY(-110%);
  opacity: 0;
  visibility: hidden;
  transition: transform 0.3s var(--ease), opacity 0.3s, visibility 0.3s;
}

.mobile-nav.is-open {
  transform: translateY(0);
  opacity: 1;
  visibility: visible;
}

.mobile-nav a {
  display: block;
  padding: 0.875rem 0;
  color: var(--text2);
  font-weight: 500;
  border-bottom: 1px solid var(--border);
}

.mobile-nav a:last-child { border-bottom: none; }

/* Buttons */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 0.5rem;
  padding: 0.8125rem 1.625rem;
  border-radius: var(--radius-sm);
  font-family: var(--font-body);
  font-weight: 600;
  font-size: 0.875rem;
  border: none;
  cursor: pointer;
  text-decoration: none;
  white-space: nowrap;
  transition: transform 0.25s var(--ease), box-shadow 0.25s, background 0.25s, border-color 0.25s;
}

.btn--primary {
  background: var(--grad);
  color: #001a26;
  box-shadow: 0 8px 24px rgba(0, 200, 255, 0.22);
}

.btn--primary:hover {
  color: #001a26;
  transform: translateY(-2px);
  box-shadow: 0 12px 32px rgba(0, 200, 255, 0.38);
}

.btn--ghost {
  background: rgba(0, 200, 255, 0.04);
  border: 1px solid var(--border2);
  color: var(--white);
}

.btn--ghost:hover {
  border-color: var(--accent);
  background: rgba(0, 200, 255, 0.1);
  color: var(--accent);
  transform: translateY(-1px);
}

.btn--lg { padding: 1rem 2rem; font-size: 0.9375rem; }

.btn svg { width: 1.125rem; height: 1.125rem; flex-shrink: 0; }

/* Hero */
.hero {
  padding: calc(var(--header-h) + 3rem) var(--pad) 4rem;
  max-width: var(--max);
  margin: 0 auto;
}

.hero__inner {
  display: grid;
  gap: 3rem;
  align-items: center;
}

.badge {
  display: inline-flex;
  align-items: center;
  gap: 0.5rem;
  padding: 0.375rem 0.875rem;
  border-radius: 100px;
  background: rgba(0, 200, 255, 0.08);
  border: 1px solid var(--border2);
  color: var(--accent);
  font-size: 0.6875rem;
  font-weight: 700;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  margin-bottom: 1.25rem;
}

.badge__dot {
  width: 0.375rem;
  height: 0.375rem;
  border-radius: 50%;
  background: var(--accent3);
  box-shadow: 0 0 10px var(--accent3);
  animation: pulse 2.2s ease-in-out infinite;
}

@keyframes pulse {
  0%, 100% { opacity: 1; transform: scale(1); }
  50% { opacity: 0.5; transform: scale(1.25); }
}

.hero__title {
  font-size: clamp(2.25rem, 8vw, 3.75rem);
  font-weight: 800;
  margin-bottom: 1rem;
}

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

.hero__subtitle {
  font-size: clamp(1.125rem, 2.5vw, 1.375rem);
  color: var(--text2);
  font-weight: 500;
  margin-bottom: 0.75rem;
  max-width: 36rem;
}

.hero__ai-tagline {
  font-size: clamp(1rem, 2vw, 1.125rem);
  font-weight: 600;
  color: var(--accent2);
  margin-bottom: 0.625rem;
  max-width: 36rem;
}

.hero__ai-pitch {
  color: var(--text2);
  font-size: clamp(0.9375rem, 1.5vw, 1.0625rem);
  max-width: 36rem;
  margin-bottom: 1.25rem;
}

.hero__features {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 0.5rem 1rem;
  max-width: 36rem;
  margin-bottom: 1.5rem;
  padding: 1rem 1.125rem;
  background: rgba(0, 200, 255, 0.05);
  border: 1px solid var(--border);
  border-radius: var(--radius-sm);
}

.hero__feature {
  display: flex;
  align-items: center;
  gap: 0.5rem;
  font-size: 0.8125rem;
  font-weight: 600;
  color: var(--text2);
}

.hero__feature-icon {
  flex-shrink: 0;
  width: 1.125rem;
  height: 1.125rem;
  border-radius: 50%;
  background: rgba(0, 200, 255, 0.12);
  border: 1px solid var(--border2);
  display: flex;
  align-items: center;
  justify-content: center;
  color: var(--accent);
}

.hero__feature-icon svg { width: 0.625rem; height: 0.625rem; }

.hero__desc {
  color: var(--text);
  font-size: clamp(1rem, 1.5vw, 1.0625rem);
  max-width: 38rem;
  margin-bottom: 2rem;
}

.hero__cta {
  display: flex;
  flex-wrap: wrap;
  gap: 0.875rem;
}

/* Phone mockup */
.mockup {
  position: relative;
  display: flex;
  justify-content: center;
  padding: 1rem 0;
}

.mockup__glow {
  position: absolute;
  width: 70%;
  height: 70%;
  top: 15%;
  left: 15%;
  background: radial-gradient(circle, rgba(0, 200, 255, 0.25), transparent 70%);
  filter: blur(40px);
  pointer-events: none;
}

.phone {
  position: relative;
  width: min(280px, 78vw);
  aspect-ratio: 9 / 19;
  border-radius: 2.25rem;
  background: linear-gradient(160deg, #1a2a42 0%, #0a1424 100%);
  border: 2px solid rgba(0, 200, 255, 0.25);
  box-shadow: var(--shadow), var(--shadow-glow), inset 0 1px 0 rgba(255, 255, 255, 0.08);
  padding: 0.625rem;
  z-index: 1;
}

.phone__notch {
  position: absolute;
  top: 0.75rem;
  left: 50%;
  transform: translateX(-50%);
  width: 5rem;
  height: 1.25rem;
  background: #0a1424;
  border-radius: 0 0 1rem 1rem;
  z-index: 3;
}

.phone__screen {
  width: 100%;
  height: 100%;
  border-radius: 1.75rem;
  background: linear-gradient(180deg, #0c1a30 0%, #061018 100%);
  overflow: hidden;
  display: flex;
  flex-direction: column;
  padding: 2.25rem 0.75rem 0.75rem;
}

.phone__header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  margin-bottom: 0.75rem;
  padding: 0 0.25rem;
}

.phone__app-name {
  font-family: var(--font-display);
  font-size: 0.6875rem;
  font-weight: 700;
  color: var(--accent);
  letter-spacing: 0.05em;
}

.phone__status {
  display: flex;
  gap: 0.25rem;
}

.phone__status span {
  width: 0.375rem;
  height: 0.375rem;
  border-radius: 50%;
  background: var(--accent2);
  opacity: 0.6;
}

.phone__tabs {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 0.375rem;
  margin-bottom: 0.75rem;
}

.phone__tab {
  padding: 0.375rem 0.25rem;
  border-radius: 0.5rem;
  font-size: 0.5rem;
  font-weight: 600;
  text-align: center;
  color: var(--text3);
  background: rgba(0, 200, 255, 0.05);
  border: 1px solid transparent;
}

.phone__tab--active {
  color: var(--accent);
  border-color: var(--border2);
  background: rgba(0, 200, 255, 0.12);
}

.phone__cards {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 0.5rem;
  flex: 1;
}

.phone__card {
  border-radius: 0.625rem;
  padding: 0.5rem;
  background: rgba(0, 200, 255, 0.06);
  border: 1px solid var(--border);
  display: flex;
  flex-direction: column;
  gap: 0.25rem;
}

.phone__card--wide { grid-column: span 2; }

.phone__card-icon {
  width: 1.25rem;
  height: 1.25rem;
  color: var(--accent);
}

.phone__card-label {
  font-size: 0.5rem;
  font-weight: 700;
  color: var(--white);
  letter-spacing: 0.03em;
}

.phone__card-value {
  font-family: var(--font-mono);
  font-size: 0.5625rem;
  color: var(--accent3);
}

.phone__chart {
  display: flex;
  align-items: flex-end;
  gap: 0.1875rem;
  height: 1.5rem;
  margin-top: 0.125rem;
}

.phone__chart span {
  flex: 1;
  background: var(--grad);
  border-radius: 2px 2px 0 0;
  opacity: 0.8;
}

.phone__chart span:nth-child(1) { height: 40%; }
.phone__chart span:nth-child(2) { height: 65%; }
.phone__chart span:nth-child(3) { height: 50%; }
.phone__chart span:nth-child(4) { height: 80%; }
.phone__chart span:nth-child(5) { height: 55%; }

.phone__ai-bubble {
  font-size: 0.5rem;
  color: var(--text2);
  line-height: 1.4;
  padding: 0.375rem;
  background: rgba(0, 128, 255, 0.12);
  border-radius: 0.5rem;
  border-left: 2px solid var(--accent);
}

/* Sections */
.section {
  padding: 4.5rem var(--pad);
  max-width: var(--max);
  margin: 0 auto;
}

.section--alt {
  background: rgba(5, 13, 31, 0.5);
  border-top: 1px solid var(--border);
  border-bottom: 1px solid var(--border);
  max-width: none;
}

.section--alt > .section__inner {
  max-width: var(--max);
  margin: 0 auto;
}

.section__tag {
  display: inline-block;
  font-size: 0.6875rem;
  font-weight: 700;
  letter-spacing: 0.14em;
  text-transform: uppercase;
  color: var(--accent);
  padding: 0.25rem 0.75rem;
  border-radius: 100px;
  background: rgba(0, 200, 255, 0.08);
  border: 1px solid var(--border2);
  margin-bottom: 0.875rem;
}

.section__title {
  font-size: clamp(1.75rem, 4.5vw, 2.5rem);
  font-weight: 800;
  margin-bottom: 1rem;
}

.section__lead {
  color: var(--text2);
  font-size: clamp(1rem, 1.5vw, 1.0625rem);
  max-width: 42rem;
  margin-bottom: 2.5rem;
}

.section__text {
  color: var(--text2);
  font-size: clamp(1rem, 1.5vw, 1.0625rem);
  max-width: 42rem;
}

/* Cards grid */
.cards {
  display: grid;
  gap: 1rem;
  grid-template-columns: 1fr;
}

.card {
  background: var(--panel);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 1.5rem;
  backdrop-filter: blur(8px);
  -webkit-backdrop-filter: blur(8px);
  transition: transform 0.3s var(--ease), border-color 0.3s, background 0.3s;
}

.card:hover {
  transform: translateY(-3px);
  border-color: var(--border2);
  background: var(--panel-hover);
}

.card__icon {
  width: 2.5rem;
  height: 2.5rem;
  border-radius: 0.625rem;
  background: var(--grad-soft);
  border: 1px solid var(--border2);
  display: flex;
  align-items: center;
  justify-content: center;
  color: var(--accent);
  margin-bottom: 1rem;
}

.card__icon svg { width: 1.25rem; height: 1.25rem; }

.card__title {
  font-size: 1.125rem;
  font-weight: 700;
  margin-bottom: 0.75rem;
}

.card__list li {
  position: relative;
  padding-left: 1.125rem;
  color: var(--text);
  font-size: 0.9375rem;
  margin-bottom: 0.375rem;
}

.card__list li::before {
  content: "";
  position: absolute;
  left: 0;
  top: 0.55em;
  width: 0.375rem;
  height: 0.375rem;
  border-radius: 50%;
  background: var(--accent);
  opacity: 0.7;
}

/* Base técnica */
.tech-base {
  display: grid;
  gap: 2rem;
}

.tech-base__col-title {
  font-size: 1rem;
  font-weight: 700;
  color: var(--white);
  margin-bottom: 1rem;
}

.chips {
  display: flex;
  flex-wrap: wrap;
  gap: 0.5rem;
}

.chip {
  display: inline-flex;
  align-items: center;
  padding: 0.4375rem 0.875rem;
  border-radius: 100px;
  font-size: 0.8125rem;
  font-weight: 600;
  color: var(--text2);
  background: var(--panel);
  border: 1px solid var(--border);
  transition: border-color 0.2s, background 0.2s;
}

.chip:hover {
  border-color: var(--border2);
  background: var(--panel-hover);
}

.chip--ref {
  font-family: var(--font-mono);
  font-size: 0.75rem;
  letter-spacing: 0.02em;
}

/* Diagnóstico en acción — chat cards */
.chat-cases {
  display: grid;
  gap: 1rem;
  grid-template-columns: 1fr;
}

.chat-card {
  background: var(--panel);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  overflow: hidden;
  backdrop-filter: blur(8px);
  -webkit-backdrop-filter: blur(8px);
  transition: border-color 0.3s, transform 0.3s var(--ease);
}

.chat-card:hover {
  border-color: var(--border2);
  transform: translateY(-2px);
}

.chat-card__header {
  display: flex;
  align-items: center;
  gap: 0.625rem;
  padding: 0.875rem 1.125rem;
  background: rgba(0, 200, 255, 0.06);
  border-bottom: 1px solid var(--border);
}

.chat-card__avatar {
  width: 2rem;
  height: 2rem;
  border-radius: 50%;
  background: var(--grad);
  display: flex;
  align-items: center;
  justify-content: center;
  color: #001a26;
  font-size: 0.625rem;
  font-weight: 800;
  flex-shrink: 0;
}

.chat-card__label {
  font-size: 0.75rem;
  font-weight: 700;
  color: var(--accent);
  letter-spacing: 0.06em;
  text-transform: uppercase;
}

.chat-card__body { padding: 1.125rem; }

.chat-card__symptom {
  margin-bottom: 1rem;
}

.chat-card__symptom-label,
.chat-card__response-label {
  font-size: 0.6875rem;
  font-weight: 700;
  letter-spacing: 0.1em;
  text-transform: uppercase;
  color: var(--text3);
  margin-bottom: 0.375rem;
}

.chat-card__symptom-text {
  font-size: 0.9375rem;
  font-weight: 600;
  color: var(--white);
  padding: 0.625rem 0.875rem;
  background: rgba(0, 200, 255, 0.05);
  border: 1px solid var(--border);
  border-radius: var(--radius-sm);
}

.chat-card__response-text {
  font-size: 0.9375rem;
  color: var(--text2);
  margin-bottom: 0.75rem;
  padding: 0.75rem 0.875rem;
  background: rgba(0, 128, 255, 0.08);
  border-left: 3px solid var(--accent);
  border-radius: 0 var(--radius-sm) var(--radius-sm) 0;
}

.chat-card__checks li {
  position: relative;
  padding-left: 1rem;
  font-size: 0.875rem;
  color: var(--text);
  margin-bottom: 0.3125rem;
}

.chat-card__checks li::before {
  content: "•";
  position: absolute;
  left: 0;
  color: var(--accent);
}

/* Credibilidad */
.credibility {
  text-align: center;
  padding: 4rem var(--pad);
  max-width: var(--max);
  margin: 0 auto;
}

.credibility__title {
  font-size: clamp(1.5rem, 3.5vw, 2rem);
  font-weight: 800;
  margin-bottom: 2rem;
}

.credibility__grid {
  display: flex;
  flex-wrap: wrap;
  justify-content: center;
  gap: 0.625rem;
}

.credibility__badge {
  display: inline-flex;
  align-items: center;
  gap: 0.5rem;
  padding: 0.625rem 1rem;
  border-radius: 100px;
  background: var(--panel);
  border: 1px solid var(--border);
  font-size: 0.8125rem;
  font-weight: 600;
  color: var(--text2);
  transition: border-color 0.25s, background 0.25s;
}

.credibility__badge:hover {
  border-color: var(--border2);
  background: var(--panel-hover);
}

.credibility__badge svg {
  width: 1rem;
  height: 1rem;
  color: var(--accent);
  flex-shrink: 0;
}

/* SEO HVAC/R */
.seo-section {
  padding: 4.5rem var(--pad);
  max-width: var(--max);
  margin: 0 auto;
  border-top: 1px solid var(--border);
}

.seo-section__intro {
  color: var(--text2);
  font-size: clamp(1rem, 1.5vw, 1.0625rem);
  max-width: 42rem;
  margin-bottom: 2rem;
}

.seo-topics {
  display: grid;
  gap: 1.25rem;
}

.seo-topic {
  padding: 1.25rem 1.5rem;
  background: var(--panel);
  border: 1px solid var(--border);
  border-radius: var(--radius-sm);
}

.seo-topic h2 {
  font-size: 1.125rem;
  font-weight: 700;
  margin-bottom: 0.5rem;
}

.seo-topic p {
  font-size: 0.9375rem;
  color: var(--text);
  margin: 0;
}

/* Legal subpages */
.legal-page {
  padding: calc(var(--header-h) + 3rem) var(--pad) 4rem;
  max-width: 760px;
  margin: 0 auto;
}

.legal-page__back {
  display: inline-flex;
  align-items: center;
  gap: 0.375rem;
  font-size: 0.875rem;
  font-weight: 600;
  color: var(--accent);
  margin-bottom: 2rem;
}

.legal-page__title {
  font-size: clamp(1.75rem, 4vw, 2.25rem);
  margin-bottom: 0.5rem;
}

.legal-page__updated {
  font-size: 0.8125rem;
  color: var(--text3);
  margin-bottom: 2rem;
}

.legal-page__content h2 {
  font-size: 1.125rem;
  margin: 2rem 0 0.75rem;
}

.legal-page__content p,
.legal-page__content li {
  color: var(--text);
  font-size: 0.9375rem;
  margin-bottom: 0.75rem;
}

.legal-page__content ul {
  list-style: disc;
  padding-left: 1.25rem;
  margin-bottom: 1rem;
}

.legal-page__content a { color: var(--accent); }

/* AI section */
.ai-section {
  display: grid;
  gap: 2.5rem;
  align-items: center;
}

.ai-list li {
  display: flex;
  align-items: flex-start;
  gap: 0.75rem;
  margin-bottom: 0.875rem;
  color: var(--text2);
  font-size: 0.9375rem;
}

.ai-list__check {
  flex-shrink: 0;
  width: 1.375rem;
  height: 1.375rem;
  border-radius: 50%;
  background: rgba(0, 200, 255, 0.12);
  border: 1px solid var(--border2);
  display: flex;
  align-items: center;
  justify-content: center;
  color: var(--accent);
  margin-top: 0.125rem;
}

.ai-list__check svg { width: 0.75rem; height: 0.75rem; }

.ai-illustration {
  position: relative;
  aspect-ratio: 4 / 3;
  border-radius: var(--radius);
  background: var(--panel);
  border: 1px solid var(--border);
  overflow: hidden;
  display: flex;
  align-items: center;
  justify-content: center;
  padding: 2rem;
}

.ai-illustration__core {
  position: relative;
  width: 8rem;
  height: 8rem;
}

.ai-illustration__ring {
  position: absolute;
  inset: 0;
  border-radius: 50%;
  border: 2px solid rgba(0, 200, 255, 0.2);
  animation: spin 12s linear infinite;
}

.ai-illustration__ring:nth-child(2) {
  inset: 0.75rem;
  animation-direction: reverse;
  animation-duration: 8s;
}

.ai-illustration__ring:nth-child(3) {
  inset: 1.5rem;
  border-style: dashed;
  animation-duration: 16s;
}

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

.ai-illustration__brain {
  position: absolute;
  inset: 2rem;
  border-radius: 50%;
  background: var(--grad);
  display: flex;
  align-items: center;
  justify-content: center;
  box-shadow: 0 0 40px rgba(0, 200, 255, 0.35);
}

.ai-illustration__brain svg {
  width: 2.5rem;
  height: 2.5rem;
  color: #001a26;
}

.ai-illustration__nodes {
  position: absolute;
  inset: -1rem;
}

.ai-illustration__node {
  position: absolute;
  width: 0.5rem;
  height: 0.5rem;
  border-radius: 50%;
  background: var(--accent3);
  box-shadow: 0 0 8px var(--accent3);
}

.ai-illustration__node:nth-child(1) { top: 10%; left: 20%; }
.ai-illustration__node:nth-child(2) { top: 5%; right: 25%; }
.ai-illustration__node:nth-child(3) { bottom: 15%; left: 10%; }
.ai-illustration__node:nth-child(4) { bottom: 10%; right: 15%; }
.ai-illustration__node:nth-child(5) { top: 50%; left: 0; }
.ai-illustration__node:nth-child(6) { top: 45%; right: 0; }

/* Audience pills */
.audience {
  display: grid;
  gap: 0.875rem;
  grid-template-columns: repeat(2, 1fr);
}

.audience__item {
  display: flex;
  align-items: center;
  gap: 0.75rem;
  padding: 1rem 1.125rem;
  background: var(--panel);
  border: 1px solid var(--border);
  border-radius: var(--radius-sm);
  transition: border-color 0.25s, background 0.25s;
}

.audience__item:hover {
  border-color: var(--border2);
  background: var(--panel-hover);
}

.audience__icon {
  width: 2.25rem;
  height: 2.25rem;
  border-radius: 0.5rem;
  background: rgba(0, 200, 255, 0.1);
  display: flex;
  align-items: center;
  justify-content: center;
  color: var(--accent);
  flex-shrink: 0;
}

.audience__icon svg { width: 1.125rem; height: 1.125rem; }

.audience__label {
  font-size: 0.875rem;
  font-weight: 600;
  color: var(--text2);
}

/* Before / After */
.compare {
  display: grid;
  gap: 1.25rem;
}

.compare__col {
  border-radius: var(--radius);
  padding: 1.75rem;
  border: 1px solid var(--border);
}

.compare__col--before {
  background: rgba(20, 30, 50, 0.4);
}

.compare__col--after {
  background: linear-gradient(135deg, rgba(0, 128, 255, 0.12), rgba(0, 200, 255, 0.06));
  border-color: var(--border2);
  box-shadow: var(--shadow-glow);
}

.compare__label {
  display: inline-block;
  font-size: 0.6875rem;
  font-weight: 800;
  letter-spacing: 0.14em;
  text-transform: uppercase;
  margin-bottom: 1.25rem;
  padding: 0.25rem 0.625rem;
  border-radius: 0.375rem;
}

.compare__col--before .compare__label {
  color: var(--text3);
  background: rgba(90, 122, 154, 0.15);
}

.compare__col--after .compare__label {
  color: var(--accent);
  background: rgba(0, 200, 255, 0.12);
}

.compare__list li {
  display: flex;
  align-items: flex-start;
  gap: 0.625rem;
  margin-bottom: 0.75rem;
  font-size: 0.9375rem;
  color: var(--text);
}

.compare__col--after .compare__list li { color: var(--text2); }

.compare__icon {
  flex-shrink: 0;
  width: 1.25rem;
  height: 1.25rem;
  margin-top: 0.125rem;
}

.compare__col--before .compare__icon { color: #e07070; }
.compare__col--after .compare__icon { color: var(--accent); }

/* Privacy */
.privacy-grid {
  display: grid;
  gap: 1rem;
  grid-template-columns: 1fr;
}

.privacy-card {
  text-align: center;
  padding: 1.75rem 1.25rem;
  background: var(--panel);
  border: 1px solid var(--border);
  border-radius: var(--radius);
}

.privacy-card__icon {
  width: 3rem;
  height: 3rem;
  margin: 0 auto 1rem;
  border-radius: 50%;
  background: rgba(0, 200, 255, 0.1);
  border: 1px solid var(--border2);
  display: flex;
  align-items: center;
  justify-content: center;
  color: var(--accent);
}

.privacy-card__icon svg { width: 1.375rem; height: 1.375rem; }

.privacy-card__title {
  font-size: 1rem;
  font-weight: 700;
  margin-bottom: 0.375rem;
}

.privacy-card__text {
  font-size: 0.875rem;
  color: var(--text3);
}

/* FAQ */
.faq { max-width: 42rem; }

.faq__item {
  border-bottom: 1px solid var(--border);
}

.faq__question {
  width: 100%;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 1rem;
  padding: 1.25rem 0;
  background: none;
  border: none;
  color: var(--white);
  font-family: var(--font-display);
  font-size: 1rem;
  font-weight: 600;
  text-align: left;
  cursor: pointer;
}

.faq__icon {
  flex-shrink: 0;
  width: 1.5rem;
  height: 1.5rem;
  border-radius: 50%;
  border: 1px solid var(--border2);
  display: flex;
  align-items: center;
  justify-content: center;
  color: var(--accent);
  transition: transform 0.3s var(--ease);
}

.faq__item.is-open .faq__icon { transform: rotate(45deg); }

.faq__answer {
  max-height: 0;
  overflow: hidden;
  transition: max-height 0.35s var(--ease);
}

.faq__answer-inner {
  padding: 0 0 1.25rem;
  color: var(--text);
  font-size: 0.9375rem;
}

.faq__item.is-open .faq__answer { max-height: var(--faq-height, 20rem); }

.faq__highlight {
  margin-top: 1.5rem;
  padding: 1.25rem;
  border-radius: var(--radius-sm);
  background: rgba(0, 128, 255, 0.08);
  border: 1px solid var(--border2);
  color: var(--text2);
  font-size: 0.9375rem;
}

/* CTA final */
.cta-final {
  text-align: center;
  padding: 5rem var(--pad);
  max-width: var(--max);
  margin: 0 auto;
}

.cta-final__box {
  padding: 3rem 1.5rem;
  border-radius: var(--radius);
  background: linear-gradient(135deg, rgba(0, 128, 255, 0.15), rgba(0, 200, 255, 0.06));
  border: 1px solid var(--border2);
  box-shadow: var(--shadow-glow);
}

.cta-final__title {
  font-size: clamp(1.75rem, 4vw, 2.25rem);
  margin-bottom: 0.875rem;
}

.cta-final__text {
  color: var(--text2);
  max-width: 32rem;
  margin: 0 auto 0.75rem;
  font-size: 1rem;
}

.cta-final__subtext {
  color: var(--text3);
  max-width: 28rem;
  margin: 0 auto 1.75rem;
  font-size: 0.9375rem;
}

/* Footer */
.footer {
  border-top: 1px solid var(--border);
  padding: 3rem var(--pad) 2rem;
  background: rgba(2, 6, 15, 0.9);
}

.footer__inner {
  max-width: var(--max);
  margin: 0 auto;
  display: grid;
  gap: 2rem;
}

.footer__brand-name {
  font-family: var(--font-display);
  font-size: 1.25rem;
  font-weight: 800;
  color: var(--white);
  margin-bottom: 0.25rem;
}

.footer__brand-tag {
  font-size: 0.75rem;
  color: var(--text3);
}

.footer__links {
  display: flex;
  flex-wrap: wrap;
  gap: 0.5rem 1.5rem;
}

.footer__links a {
  font-size: 0.875rem;
  color: var(--text);
}

.footer__copy {
  font-size: 0.8125rem;
  color: var(--text3);
  padding-top: 1.5rem;
  border-top: 1px solid var(--border);
}

/* Reveal animation */
.reveal {
  opacity: 0;
  transform: translateY(1.5rem);
  transition: opacity 0.6s var(--ease), transform 0.6s var(--ease);
}

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

/* Tablet */
@media (min-width: 600px) {
  .cards { grid-template-columns: repeat(2, 1fr); }
  .privacy-grid { grid-template-columns: repeat(3, 1fr); }
  .compare { grid-template-columns: 1fr 1fr; }
  .audience { grid-template-columns: repeat(3, 1fr); }
  .chat-cases { grid-template-columns: repeat(3, 1fr); }
  .tech-base { grid-template-columns: 1fr 1fr; }
  .seo-topics { grid-template-columns: repeat(2, 1fr); }
}

/* Desktop */
@media (min-width: 768px) {
  .menu-btn { display: none; }
  .nav { display: flex; }

  .hero__inner {
    grid-template-columns: 1fr 1fr;
    gap: 2rem;
  }

  .hero { padding-top: calc(var(--header-h) + 4rem); }

  .mockup { justify-content: flex-end; }

  .ai-section { grid-template-columns: 1fr 1fr; }

  .section { padding: 5.5rem var(--pad); }
}

@media (min-width: 900px) {
  .cards { grid-template-columns: repeat(3, 1fr); }
}

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