/* ═══════════════════════════════════════════
   Authority Brand Builder — Platform Landing
   Dark SaaS theme · .io domain
   ═══════════════════════════════════════════ */

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

:root {
  --bg:        #0B0E17;
  --bg-card:   #111627;
  --bg-card2:  #161B2E;
  --bg-hover:  #1C2240;
  --border:    rgba(255,255,255,.06);
  --border-l:  rgba(255,255,255,.10);
  --text:      #C5C9D6;
  --text-dim:  #7C8298;
  --text-bright: #ECEEF4;
  --white:     #FFFFFF;
  --accent:    #5B7FFF;
  --accent-l:  #7B9AFF;
  --accent-glow: rgba(91,127,255,.15);
  --accent-glow2: rgba(91,127,255,.08);
  --gold:      #C8A44E;
  --green:     #34D399;
  --red:       #EF4444;
  --radius:    12px;
  --radius-lg: 20px;
  --radius-sm: 8px;
  --font:      'Inter', -apple-system, BlinkMacSystemFont, sans-serif;
  --font-d:    'Playfair Display', Georgia, serif;
  --shadow:    0 4px 24px rgba(0,0,0,.3);
  --shadow-lg: 0 12px 48px rgba(0,0,0,.4);
  --transition: .25s cubic-bezier(.4,0,.2,1);
}

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

body {
  font-family: var(--font);
  background: var(--bg);
  color: var(--text);
  line-height: 1.65;
  font-size: 16px;
  overflow-x: hidden;
  -webkit-font-smoothing: antialiased;
}

.container {
  max-width: 1200px;
  margin: 0 auto;
  padding: 0 24px;
}

a { color: inherit; text-decoration: none; }
img { max-width: 100%; display: block; }
ul { list-style: none; }

h1, h2, h3, h4 { color: var(--white); line-height: 1.15; }
h1 { font-family: var(--font-d); font-size: clamp(2.4rem, 5vw, 3.6rem); font-weight: 800; letter-spacing: -.02em; }
h2 { font-family: var(--font-d); font-size: clamp(1.8rem, 3.5vw, 2.8rem); font-weight: 700; letter-spacing: -.015em; }
h3 { font-size: clamp(1.15rem, 2vw, 1.4rem); font-weight: 700; }
h4 { font-size: 1.05rem; font-weight: 600; }

.accent { color: var(--accent-l); }

.section-tag {
  font-size: .8rem;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: .14em;
  color: var(--accent);
  margin-bottom: 12px;
}

/* ─── Buttons ─── */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  font-family: var(--font);
  font-weight: 600;
  font-size: .95rem;
  padding: 14px 28px;
  border-radius: var(--radius);
  border: none;
  cursor: pointer;
  transition: var(--transition);
  text-decoration: none;
  gap: 8px;
}

.btn-accent {
  background: var(--accent);
  color: var(--white);
  box-shadow: 0 4px 20px rgba(91,127,255,.3);
}
.btn-accent:hover {
  background: var(--accent-l);
  box-shadow: 0 6px 28px rgba(91,127,255,.4);
  transform: translateY(-2px);
}

.btn-lg { padding: 18px 36px; font-size: 1.05rem; }
.btn-full { width: 100%; }

.btn-outline {
  background: transparent;
  color: var(--accent-l);
  border: 1.5px solid var(--accent);
}
.btn-outline:hover {
  background: var(--accent-glow);
  border-color: var(--accent-l);
}

/* ═══════════════ NAVIGATION ═══════════════ */
.nav {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  z-index: 1000;
  padding: 16px 0;
  transition: var(--transition);
}

.nav.scrolled {
  background: rgba(11,14,23,.92);
  backdrop-filter: blur(16px);
  -webkit-backdrop-filter: blur(16px);
  border-bottom: 1px solid var(--border);
  padding: 10px 0;
}

.nav-inner {
  max-width: 1200px;
  margin: 0 auto;
  padding: 0 24px;
  display: flex;
  align-items: center;
  justify-content: space-between;
}

.nav-logo {
  display: flex;
  align-items: center;
  gap: 10px;
  font-weight: 700;
  font-size: .95rem;
  color: var(--white);
}

.logo-icon {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 36px;
  height: 36px;
  background: var(--accent);
  color: var(--white);
  font-weight: 800;
  font-size: .8rem;
  border-radius: 8px;
}

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

.nav-links a {
  font-size: .88rem;
  font-weight: 500;
  color: var(--text-dim);
  transition: var(--transition);
}
.nav-links a:hover { color: var(--white); }

.nav-cta {
  padding: 8px 18px !important;
  border-radius: var(--radius-sm) !important;
  font-weight: 600 !important;
  color: var(--accent-l) !important;
  border: 1px solid rgba(91,127,255,.25);
}
.nav-cta:hover { background: var(--accent-glow) !important; }

.nav-cta-primary {
  background: var(--accent) !important;
  color: var(--white) !important;
  border: none !important;
}
.nav-cta-primary:hover { background: var(--accent-l) !important; }

.nav-toggle {
  display: none;
  flex-direction: column;
  gap: 5px;
  background: none;
  border: none;
  cursor: pointer;
  padding: 4px;
  z-index: 1001;
}
.nav-toggle span {
  width: 24px;
  height: 2px;
  background: var(--white);
  border-radius: 2px;
  transition: var(--transition);
}
.nav-toggle.open span:nth-child(1) { transform: rotate(45deg) translate(5px, 5px); }
.nav-toggle.open span:nth-child(2) { opacity: 0; }
.nav-toggle.open span:nth-child(3) { transform: rotate(-45deg) translate(5px, -5px); }

.nav-overlay {
  position: fixed;
  inset: 0;
  background: rgba(0,0,0,.6);
  backdrop-filter: blur(4px);
  z-index: 999;
  opacity: 0;
  pointer-events: none;
  transition: var(--transition);
}
.nav-overlay.active {
  opacity: 1;
  pointer-events: all;
}

/* ═══════════════ HERO ═══════════════ */
.hero {
  position: relative;
  padding: 160px 0 100px;
  overflow: hidden;
}

.hero-glow {
  position: absolute;
  top: -120px;
  left: 50%;
  transform: translateX(-50%);
  width: 800px;
  height: 600px;
  background: radial-gradient(ellipse at center, var(--accent-glow) 0%, transparent 70%);
  pointer-events: none;
  z-index: 0;
}

.hero-grid-bg {
  position: absolute;
  inset: 0;
  background-image:
    linear-gradient(rgba(91,127,255,.03) 1px, transparent 1px),
    linear-gradient(90deg, rgba(91,127,255,.03) 1px, transparent 1px);
  background-size: 60px 60px;
  mask-image: radial-gradient(ellipse 70% 60% at 50% 30%, black 30%, transparent 100%);
  -webkit-mask-image: radial-gradient(ellipse 70% 60% at 50% 30%, black 30%, transparent 100%);
  pointer-events: none;
  z-index: 0;
}

.hero-layout {
  position: relative;
  z-index: 1;
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 60px;
  align-items: center;
}

.hero-badge {
  display: inline-block;
  background: var(--accent-glow);
  color: var(--accent-l);
  font-size: .78rem;
  font-weight: 600;
  padding: 6px 14px;
  border-radius: 50px;
  border: 1px solid rgba(91,127,255,.2);
  margin-bottom: 24px;
  text-transform: uppercase;
  letter-spacing: .08em;
}

.hero h1 { margin-bottom: 20px; }

.hero-sub {
  font-size: 1.1rem;
  line-height: 1.7;
  color: var(--text);
  max-width: 540px;
  margin-bottom: 32px;
}

.hero-actions { display: flex; flex-direction: column; align-items: flex-start; gap: 12px; }

.hero-note {
  font-size: .82rem;
  color: var(--text-dim);
  padding-left: 4px;
}

/* Video placeholder */
.video-wrapper {
  position: relative;
  border-radius: var(--radius-lg);
  overflow: hidden;
  background: var(--bg-card);
  border: 1px solid var(--border-l);
  box-shadow: var(--shadow-lg);
}

.video-placeholder {
  position: relative;
  cursor: pointer;
}

.video-placeholder img {
  width: 100%;
  height: auto;
  display: block;
  aspect-ratio: 16 / 9;
  object-fit: cover;
}

.play-btn {
  position: absolute;
  top: 50%;
  left: 50%;
  transform: translate(-50%, -50%);
  width: 64px;
  height: 64px;
  background: var(--accent);
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
  color: var(--white);
  box-shadow: 0 4px 20px rgba(91,127,255,.4);
  transition: var(--transition);
  z-index: 2;
}
.video-placeholder:hover .play-btn {
  transform: translate(-50%, -50%) scale(1.08);
  box-shadow: 0 6px 30px rgba(91,127,255,.5);
}

.video-label {
  position: absolute;
  bottom: 16px;
  left: 50%;
  transform: translateX(-50%);
  background: rgba(11,14,23,.8);
  color: var(--text-dim);
  font-size: .78rem;
  font-weight: 500;
  padding: 6px 14px;
  border-radius: 50px;
  backdrop-filter: blur(8px);
  z-index: 2;
  white-space: nowrap;
}

/* ═══════════════ TRUST BAR ═══════════════ */
.trust-bar {
  padding: 40px 0;
  border-top: 1px solid var(--border);
  border-bottom: 1px solid var(--border);
  background: var(--bg-card);
}

.trust-stats {
  display: flex;
  justify-content: center;
  gap: 60px;
}

.trust-stat {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 4px;
}

.trust-num {
  font-size: 1.5rem;
  font-weight: 800;
  color: var(--white);
}

.trust-label {
  font-size: .78rem;
  color: var(--text-dim);
  font-weight: 500;
  text-transform: uppercase;
  letter-spacing: .06em;
}

/* ═══════════════ PROBLEM ═══════════════ */
.problem-section {
  padding: 100px 0;
}

.problem-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 60px;
  align-items: start;
}

.problem-content p {
  font-size: 1.05rem;
  margin-top: 16px;
  line-height: 1.75;
}

.problem-cards {
  display: flex;
  flex-direction: column;
  gap: 16px;
}

.pain-card {
  display: flex;
  align-items: flex-start;
  gap: 16px;
  padding: 24px;
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  transition: var(--transition);
}
.pain-card:hover {
  border-color: var(--border-l);
  background: var(--bg-card2);
}

.pain-icon {
  flex-shrink: 0;
  width: 40px;
  height: 40px;
  display: flex;
  align-items: center;
  justify-content: center;
  background: rgba(239,68,68,.1);
  color: var(--red);
  border-radius: 10px;
}

.pain-card h4 { font-size: .95rem; margin-bottom: 4px; }
.pain-card p { font-size: .88rem; color: var(--text-dim); line-height: 1.6; }

/* ═══════════════ MECHANISM (Knowledge Brain) ═══════════════ */
.mechanism-section {
  padding: 100px 0;
  background: var(--bg-card);
  border-top: 1px solid var(--border);
  border-bottom: 1px solid var(--border);
}

.mech-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 60px;
  align-items: center;
}

/* Animated brain card */
.brain-card {
  background: var(--bg);
  border: 1px solid var(--border-l);
  border-radius: var(--radius-lg);
  overflow: hidden;
  box-shadow: var(--shadow-lg);
}

.brain-header {
  display: flex;
  align-items: center;
  gap: 10px;
  padding: 16px 20px;
  background: var(--bg-card2);
  border-bottom: 1px solid var(--border);
  font-size: .82rem;
  font-weight: 600;
  color: var(--text-dim);
}

.brain-dot {
  width: 8px;
  height: 8px;
  background: var(--green);
  border-radius: 50%;
  box-shadow: 0 0 8px rgba(52,211,153,.4);
  animation: pulse-dot 2s infinite;
}

@keyframes pulse-dot {
  0%, 100% { opacity: 1; }
  50% { opacity: .5; }
}

.brain-items {
  padding: 20px;
  display: flex;
  flex-direction: column;
  gap: 10px;
}

.brain-item {
  display: flex;
  align-items: center;
  gap: 12px;
  padding: 12px 16px;
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: var(--radius-sm);
  font-size: .88rem;
  font-weight: 500;
  color: var(--text-bright);
  transition: var(--transition);
}
.brain-item:hover {
  border-color: var(--accent);
  background: var(--accent-glow2);
}

.bi-icon {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 28px;
  height: 28px;
  background: var(--accent-glow);
  color: var(--accent-l);
  font-weight: 700;
  font-size: .72rem;
  border-radius: 6px;
  flex-shrink: 0;
}

.brain-footer {
  display: flex;
  align-items: center;
  gap: 10px;
  padding: 14px 20px;
  background: var(--bg-card2);
  border-top: 1px solid var(--border);
  font-size: .8rem;
  font-weight: 600;
  color: var(--accent-l);
}

.brain-pulse {
  width: 6px;
  height: 6px;
  background: var(--accent);
  border-radius: 50%;
  animation: pulse-dot 1.5s infinite;
}

.mech-content p {
  font-size: 1.05rem;
  margin-top: 16px;
  line-height: 1.75;
}

.mech-content .mech-lead {
  font-size: 1.1rem;
  color: var(--text-bright);
}

.mech-content .btn { margin-top: 24px; }

/* ═══════════════ AGENTS ═══════════════ */
.agents-section {
  padding: 100px 0;
}

.agents-section > .container > h2 { margin-bottom: 12px; }
.agents-sub {
  font-size: 1.05rem;
  color: var(--text);
  max-width: 640px;
  line-height: 1.7;
  margin-bottom: 48px;
}

.agents-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 20px;
}

.agent-card {
  padding: 32px 28px;
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  transition: var(--transition);
  position: relative;
}
.agent-card:hover {
  border-color: rgba(91,127,255,.2);
  background: var(--bg-card2);
  transform: translateY(-3px);
  box-shadow: var(--shadow);
}

.agent-num {
  font-size: 2rem;
  font-weight: 800;
  color: rgba(91,127,255,.15);
  margin-bottom: 12px;
  font-family: var(--font);
}

.agent-card h3 { margin-bottom: 10px; }
.agent-card p {
  font-size: .9rem;
  line-height: 1.65;
  color: var(--text-dim);
  margin-bottom: 16px;
}

.agent-tag {
  display: inline-block;
  font-size: .72rem;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: .1em;
  color: var(--accent);
  padding: 4px 10px;
  background: var(--accent-glow);
  border-radius: 50px;
}

.agent-card-featured {
  border-color: rgba(91,127,255,.25);
  background: linear-gradient(135deg, var(--bg-card) 0%, rgba(91,127,255,.04) 100%);
}
.agent-card-featured .agent-num { color: rgba(91,127,255,.3); }

/* ═══════════════ EXPLAINER VIDEO ═══════════════ */
.explainer-section {
  padding: 100px 0;
  background: var(--bg-card);
  border-top: 1px solid var(--border);
  border-bottom: 1px solid var(--border);
  text-align: center;
}

.explainer-sub {
  font-size: 1.05rem;
  color: var(--text);
  max-width: 580px;
  margin: 16px auto 40px;
  line-height: 1.7;
}

.video-wide {
  max-width: 900px;
  margin: 0 auto;
}

/* ═══════════════ STEPS ═══════════════ */
.steps-section {
  padding: 100px 0;
  text-align: center;
}

.steps-section > .container > h2 { margin-bottom: 48px; }

.steps-grid {
  display: flex;
  align-items: flex-start;
  justify-content: center;
  gap: 0;
}

.step-card {
  flex: 1;
  max-width: 320px;
  padding: 32px 28px;
  text-align: center;
}

.step-num {
  width: 52px;
  height: 52px;
  margin: 0 auto 20px;
  display: flex;
  align-items: center;
  justify-content: center;
  background: var(--accent);
  color: var(--white);
  font-size: 1.2rem;
  font-weight: 800;
  border-radius: 50%;
  box-shadow: 0 4px 16px rgba(91,127,255,.3);
}

.step-card h3 { margin-bottom: 10px; }
.step-card p {
  font-size: .92rem;
  color: var(--text-dim);
  line-height: 1.65;
}

.step-line {
  width: 80px;
  height: 2px;
  background: linear-gradient(90deg, var(--accent), rgba(91,127,255,.15));
  margin-top: 56px;
  flex-shrink: 0;
}

/* ═══════════════ FIT SECTION ═══════════════ */
.fit-section {
  padding: 100px 0;
  background: var(--bg-card);
  border-top: 1px solid var(--border);
  border-bottom: 1px solid var(--border);
}

.fit-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 60px;
  align-items: center;
}

.fit-list {
  margin-top: 28px;
  display: flex;
  flex-direction: column;
  gap: 18px;
}

.fit-list li {
  display: flex;
  align-items: flex-start;
  gap: 14px;
  font-size: 1rem;
  color: var(--text-bright);
  line-height: 1.6;
}

.fit-list li svg {
  flex-shrink: 0;
  color: var(--green);
  margin-top: 3px;
}

.fit-image img {
  border-radius: var(--radius-lg);
  box-shadow: var(--shadow-lg);
}

/* ═══════════════ BUILDERS (Sonia + James story) ═══════════════ */
.builders-section {
  padding: 80px 0;
}

.builders-inner {
  display: grid;
  grid-template-columns: auto 1fr;
  gap: 40px;
  align-items: center;
  padding: 40px 48px;
  background: linear-gradient(135deg, var(--bg-card) 0%, rgba(91,127,255,.03) 100%);
  border: 1px solid var(--border-l);
  border-radius: var(--radius-lg);
}

.builders-photos {
  display: flex;
  gap: 0;
}

.builders-photos img {
  width: 80px;
  height: 80px;
  border-radius: 50%;
  object-fit: cover;
  object-position: top;
  border: 3px solid var(--bg);
}
.builders-photos img:nth-child(2) { margin-left: -20px; }

.builders-text p {
  font-size: 1rem;
  line-height: 1.7;
}
.builders-text p + p { margin-top: 10px; }
.builders-text strong { color: var(--white); }

/* ═══════════════ PRICING ═══════════════ */
.pricing-section {
  padding: 100px 0;
  text-align: center;
}

.pricing-section > .container > h2 { margin-bottom: 48px; }

.pricing-card {
  max-width: 540px;
  margin: 0 auto;
  background: var(--bg-card);
  border: 1px solid var(--border-l);
  border-radius: var(--radius-lg);
  overflow: hidden;
  box-shadow: var(--shadow-lg);
  text-align: center;
}

.pricing-header {
  padding: 40px 36px 32px;
  background: linear-gradient(135deg, var(--bg-card2) 0%, rgba(91,127,255,.04) 100%);
  border-bottom: 1px solid var(--border);
}

.pricing-badge {
  display: inline-block;
  font-size: .72rem;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: .12em;
  color: var(--accent-l);
  background: var(--accent-glow);
  padding: 5px 14px;
  border-radius: 50px;
  margin-bottom: 16px;
}

.pricing-header h3 {
  font-size: 1.3rem;
  margin-bottom: 16px;
}

.pricing-amount {
  display: flex;
  align-items: baseline;
  justify-content: center;
  gap: 4px;
}

.pricing-price {
  font-size: 3.5rem;
  font-weight: 800;
  color: var(--white);
  line-height: 1;
}

.pricing-period {
  font-size: 1.1rem;
  color: var(--text-dim);
  font-weight: 500;
}

.pricing-trial {
  font-size: .92rem;
  color: var(--text-dim);
  margin-top: 12px;
}

.pricing-features {
  padding: 32px 36px;
}

.pricing-features ul {
  text-align: left;
  display: flex;
  flex-direction: column;
  gap: 14px;
}

.pricing-features li {
  font-size: .92rem;
  color: var(--text);
  padding-left: 28px;
  position: relative;
  line-height: 1.5;
}

.pricing-features li::before {
  content: '✓';
  position: absolute;
  left: 0;
  color: var(--green);
  font-weight: 700;
}

.pricing-cta {
  padding: 0 36px 36px;
}

.pricing-guarantee {
  font-size: .82rem;
  color: var(--text-dim);
  margin-top: 12px;
}

.pricing-upgrade {
  margin-top: 40px;
  padding: 32px;
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 20px;
  max-width: 700px;
  margin-left: auto;
  margin-right: auto;
}

.pricing-upgrade p {
  font-size: .95rem;
  color: var(--text);
}

/* ═══════════════ FAQ ═══════════════ */
.faq-section {
  padding: 100px 0;
  background: var(--bg-card);
  border-top: 1px solid var(--border);
  border-bottom: 1px solid var(--border);
}

.faq-section > .container > h2 { margin-bottom: 48px; }

.faq-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 24px;
}

.faq-item {
  padding: 28px;
  background: var(--bg);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  transition: var(--transition);
}
.faq-item:hover {
  border-color: var(--border-l);
}

.faq-item h4 {
  margin-bottom: 10px;
  font-size: 1rem;
}

.faq-item p {
  font-size: .9rem;
  color: var(--text-dim);
  line-height: 1.65;
}

.faq-item a {
  color: var(--accent-l);
  text-decoration: underline;
  text-underline-offset: 3px;
}
.faq-item a:hover { color: var(--white); }

/* ═══════════════ FINAL CTA ═══════════════ */
.final-cta {
  padding: 120px 0;
  text-align: center;
  position: relative;
  overflow: hidden;
}

.final-glow {
  position: absolute;
  top: 50%;
  left: 50%;
  transform: translate(-50%, -50%);
  width: 700px;
  height: 400px;
  background: radial-gradient(ellipse at center, var(--accent-glow) 0%, transparent 70%);
  pointer-events: none;
}

.final-cta .container { position: relative; z-index: 1; }

.final-cta h2 { margin-bottom: 16px; }

.final-sub {
  font-size: 1.1rem;
  color: var(--text);
  margin-bottom: 32px;
}

.final-note {
  font-size: .82rem;
  color: var(--text-dim);
  margin-top: 12px;
}

/* ═══════════════ FOOTER ═══════════════ */
.footer {
  padding: 64px 0 32px;
  border-top: 1px solid var(--border);
}

.footer-grid {
  display: grid;
  grid-template-columns: 2fr 1fr 1fr;
  gap: 40px;
  margin-bottom: 40px;
}

.footer-brand h3 {
  font-size: 1.1rem;
  margin-bottom: 10px;
}
.footer-brand p {
  font-size: .88rem;
  color: var(--text-dim);
  line-height: 1.6;
}

.footer-links h4 {
  font-size: .82rem;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: .1em;
  color: var(--text-dim);
  margin-bottom: 14px;
}

.footer-links a {
  display: block;
  font-size: .88rem;
  color: var(--text);
  padding: 5px 0;
  transition: var(--transition);
}
.footer-links a:hover { color: var(--accent-l); }

.footer-bottom {
  border-top: 1px solid var(--border);
  padding-top: 24px;
  text-align: center;
}

.footer-bottom p {
  font-size: .78rem;
  color: var(--text-dim);
}

/* ═══════════════════════════════════════════
   RESPONSIVE
   ═══════════════════════════════════════════ */

/* ─── Tablet (≤1024) ─── */
@media (max-width: 1024px) {
  .hero-layout { grid-template-columns: 1fr; gap: 40px; }
  .hero-content { text-align: center; }
  .hero-sub { margin-left: auto; margin-right: auto; }
  .hero-actions { align-items: center; }
  .hero-video { max-width: 600px; margin: 0 auto; }

  .problem-grid { grid-template-columns: 1fr; gap: 40px; }
  .mech-grid { grid-template-columns: 1fr; gap: 40px; }
  .mech-visual { order: 2; max-width: 500px; margin: 0 auto; }
  .fit-grid { grid-template-columns: 1fr; gap: 40px; }
  .fit-image { order: -1; max-width: 500px; margin: 0 auto; }

  .agents-grid { grid-template-columns: repeat(2, 1fr); }

  .footer-grid { grid-template-columns: 1fr 1fr; }
  .footer-brand { grid-column: 1 / -1; }
}

/* ─── Mobile (≤768) ─── */
@media (max-width: 768px) {
  body { font-size: 15px; }

  .hero { padding: 130px 0 60px; }
  h1 { font-size: clamp(1.9rem, 7vw, 2.6rem); }
  h2 { font-size: clamp(1.5rem, 5vw, 2rem); }

  .nav-links {
    position: fixed;
    top: 0;
    right: -100%;
    width: 280px;
    height: 100dvh;
    background: var(--bg-card);
    border-left: 1px solid var(--border);
    flex-direction: column;
    align-items: flex-start;
    padding: 80px 28px 28px;
    gap: 0;
    transition: right .3s ease;
    z-index: 1000;
    overflow-y: auto;
  }
  .nav-links.open { right: 0; }
  .nav-links a {
    padding: 14px 0;
    width: 100%;
    border-bottom: 1px solid var(--border);
    font-size: .95rem;
    color: var(--text-bright);
  }
  .nav-cta { margin-top: 12px; text-align: center !important; }
  .nav-toggle { display: flex; }

  .trust-stats { flex-wrap: wrap; gap: 20px 40px; }

  .problem-section,
  .mechanism-section,
  .agents-section,
  .explainer-section,
  .steps-section,
  .fit-section,
  .pricing-section,
  .faq-section { padding: 64px 0; }

  .agents-grid { grid-template-columns: 1fr; }
  .agent-card { padding: 24px 20px; }

  .steps-grid { flex-direction: column; gap: 8px; align-items: center; }
  .step-line { width: 2px; height: 40px; background: linear-gradient(180deg, var(--accent), rgba(91,127,255,.15)); margin: 0; }

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

  .pricing-upgrade {
    flex-direction: column;
    text-align: center;
  }

  .final-cta { padding: 80px 0; }

  .footer-grid { grid-template-columns: 1fr; gap: 28px; }

  .builders-inner {
    grid-template-columns: 1fr;
    text-align: center;
    padding: 28px 24px;
    gap: 24px;
  }
  .builders-photos { justify-content: center; }
}

/* ─── Small phones (≤480) ─── */
@media (max-width: 480px) {
  .container { padding: 0 16px; }

  h1 { font-size: clamp(1.7rem, 8vw, 2.2rem); }

  .hero { padding: 120px 0 48px; }
  .hero-badge { font-size: .72rem; padding: 5px 12px; }

  .btn-lg { padding: 15px 28px; font-size: .95rem; }

  .trust-stats { gap: 16px 24px; }
  .trust-num { font-size: 1.2rem; }
  .trust-label { font-size: .7rem; }

  .brain-items { padding: 12px; gap: 8px; }
  .brain-item { padding: 10px 12px; font-size: .82rem; }

  .pricing-header { padding: 28px 20px 24px; }
  .pricing-features { padding: 24px 20px; }
  .pricing-cta { padding: 0 20px 28px; }
  .pricing-price { font-size: 2.8rem; }

  .faq-item { padding: 20px; }
}