/* ============================================================
   TOKENS & RESET
   ============================================================ */
:root {
  --navy:       #0a1628;
  --navy-mid:   #0e2044;
  --navy-light: #12305c;
  --blue:       #1d6fa4;
  --blue-mid:   #1a8fd1;
  --blue-light: #4fb3e8;
  --blue-pale:  #e8f4fb;
  --white:      #ffffff;
  --off-white:  #f4f8fc;
  --slate:      #6b7a8d;
  --slate-light:#8fa0b5;
  --text:       #1c2b3a;
  --text-muted: #4a5f74;
  --border:     #d1dde8;
  --success:    #1a9e6e;

  --radius-sm:  6px;
  --radius:     12px;
  --radius-lg:  20px;
  --shadow-sm:  0 1px 4px rgba(10,22,40,.07);
  --shadow:     0 4px 20px rgba(10,22,40,.10);
  --shadow-lg:  0 8px 40px rgba(10,22,40,.14);

  --font:  'Segoe UI', system-ui, -apple-system, sans-serif;
  --font-mono: 'Courier New', monospace;

  --transition: 0.22s ease;
  --max-w: 1120px;
}

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

html { scroll-behavior: smooth; font-size: 16px; }

body {
  font-family: var(--font);
  color: var(--text);
  background: var(--white);
  line-height: 1.65;
  -webkit-font-smoothing: antialiased;
}

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

/* ============================================================
   UTILITY
   ============================================================ */
.container {
  width: 100%;
  max-width: var(--max-w);
  margin-inline: auto;
  padding-inline: 24px;
}

.section {
  padding-block: 96px;
}

.section-tag {
  display: inline-block;
  font-size: 0.75rem;
  font-weight: 700;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  color: var(--blue-mid);
  background: var(--blue-pale);
  border: 1px solid rgba(29,111,164,.15);
  padding: 4px 12px;
  border-radius: 100px;
  margin-bottom: 16px;
}
.section-tag.center { display: block; text-align: center; }

.section-title {
  font-size: clamp(1.75rem, 3vw, 2.6rem);
  font-weight: 700;
  line-height: 1.2;
  color: var(--navy);
  margin-bottom: 20px;
}
.section-title.center { text-align: center; }

.section-intro {
  font-size: 1.05rem;
  color: var(--text-muted);
  max-width: 640px;
  margin-bottom: 56px;
}
.section-intro.center {
  margin-inline: auto;
  text-align: center;
}

/* BUTTONS */
.btn {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  font-size: 0.95rem;
  font-weight: 600;
  padding: 12px 24px;
  border-radius: var(--radius-sm);
  border: 2px solid transparent;
  transition: background var(--transition), color var(--transition), border-color var(--transition), transform var(--transition);
  white-space: nowrap;
}
.btn:hover { transform: translateY(-1px); }
.btn:active { transform: translateY(0); }

.btn-primary {
  background: var(--blue);
  color: var(--white);
  border-color: var(--blue);
}
.btn-primary:hover { background: var(--blue-mid); border-color: var(--blue-mid); }

.btn-outline {
  background: transparent;
  color: var(--white);
  border-color: rgba(255,255,255,.5);
}
.btn-outline:hover {
  background: rgba(255,255,255,.1);
  border-color: var(--white);
}

.btn-sm { font-size: 0.85rem; padding: 8px 18px; }
.btn-lg { font-size: 1rem; padding: 14px 32px; }
.btn-block { width: 100%; justify-content: center; }

/* CARDS */
.card {
  background: var(--white);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 28px;
  transition: box-shadow var(--transition), transform var(--transition);
}
.card:hover {
  box-shadow: var(--shadow);
  transform: translateY(-3px);
}

/* ============================================================
   NAVIGATION
   ============================================================ */
.nav-header {
  position: fixed;
  top: 0; left: 0; right: 0;
  z-index: 100;
  background: rgba(10,22,40,.0);
  backdrop-filter: blur(0px);
  transition: background 0.3s ease, backdrop-filter 0.3s ease, box-shadow 0.3s ease;
}
.nav-header.scrolled {
  background: rgba(10,22,40,.95);
  backdrop-filter: blur(12px);
  box-shadow: 0 2px 20px rgba(0,0,0,.25);
}

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

.nav-logo {
  font-size: 1.35rem;
  font-weight: 800;
  color: var(--white);
  letter-spacing: -0.02em;
}
.nav-logo span { color: var(--blue-light); }

.nav-links {
  display: flex;
  align-items: center;
  gap: 32px;
}
.nav-links a {
  font-size: 0.875rem;
  font-weight: 500;
  color: rgba(255,255,255,.8);
  transition: color var(--transition);
}
.nav-links a:hover { color: var(--white); }
.nav-links .btn { margin-left: 8px; }

.nav-toggle {
  display: none;
  flex-direction: column;
  gap: 5px;
  background: none;
  border: none;
  padding: 4px;
}
.nav-toggle span {
  display: block;
  width: 24px;
  height: 2px;
  background: var(--white);
  border-radius: 2px;
  transition: transform 0.25s, opacity 0.25s;
}
.nav-toggle.open span:nth-child(1) { transform: translateY(7px) rotate(45deg); }
.nav-toggle.open span:nth-child(2) { opacity: 0; }
.nav-toggle.open span:nth-child(3) { transform: translateY(-7px) rotate(-45deg); }

/* ============================================================
   HERO
   ============================================================ */
.hero {
  position: relative;
  min-height: 100vh;
  display: flex;
  align-items: center;
  overflow: hidden;
  background: var(--navy);
}

.hero-bg {
  position: absolute;
  inset: 0;
  background:
    radial-gradient(ellipse 80% 60% at 60% 40%, rgba(29,111,164,.28) 0%, transparent 70%),
    radial-gradient(ellipse 60% 50% at 20% 80%, rgba(18,48,92,.6) 0%, transparent 60%),
    linear-gradient(135deg, var(--navy) 0%, var(--navy-mid) 50%, #0b1e40 100%);
  pointer-events: none;
}

.hero-bg::after {
  content: '';
  position: absolute;
  inset: 0;
  background-image:
    radial-gradient(circle at 1px 1px, rgba(255,255,255,.04) 1px, transparent 0);
  background-size: 40px 40px;
}

.hero-content {
  position: relative;
  z-index: 1;
  padding-top: 100px;
  padding-bottom: 80px;
  max-width: 760px;
}

.hero-tag {
  display: inline-block;
  font-size: 0.75rem;
  font-weight: 600;
  letter-spacing: 0.14em;
  text-transform: uppercase;
  color: var(--blue-light);
  border: 1px solid rgba(79,179,232,.3);
  padding: 5px 14px;
  border-radius: 100px;
  margin-bottom: 24px;
  background: rgba(79,179,232,.08);
}

.hero-title {
  font-size: clamp(3rem, 8vw, 6rem);
  font-weight: 800;
  color: var(--white);
  line-height: 1;
  letter-spacing: -0.03em;
  margin-bottom: 16px;
}
.hero-title span { color: var(--blue-light); }

.hero-subtitle {
  font-size: clamp(1.1rem, 2.5vw, 1.5rem);
  font-weight: 500;
  color: rgba(255,255,255,.75);
  margin-bottom: 24px;
  letter-spacing: -0.01em;
}

.hero-text {
  font-size: 1.1rem;
  color: rgba(255,255,255,.65);
  max-width: 580px;
  margin-bottom: 40px;
  line-height: 1.7;
}

.hero-actions {
  display: flex;
  gap: 16px;
  flex-wrap: wrap;
}

.hero-image {
  position: absolute;
  right: 0;
  top: 0;
  bottom: 0;
  width: 50%;
  overflow: hidden;
  z-index: 0;
}
.hero-image img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  opacity: 0.5;
  mask-image: linear-gradient(to right, transparent 0%, rgba(0,0,0,0.8) 40%, black 100%);
  -webkit-mask-image: linear-gradient(to right, transparent 0%, rgba(0,0,0,0.8) 40%, black 100%);
}

.card-photo {
  width: 100%;
  height: 160px;
  object-fit: cover;
  border-radius: var(--radius);
  margin-bottom: 20px;
  display: block;
}

.card-photo-placeholder {
  width: 100%;
  height: 160px;
  border-radius: var(--radius);
  margin-bottom: 20px;
  background-size: cover;
  background-position: center;
}
.placeholder-blue   { background: linear-gradient(135deg, #1d6fa4 0%, #4fb3e8 100%); }
.placeholder-teal   { background: linear-gradient(135deg, #1a9e6e 0%, #4fb3e8 100%); }
.placeholder-purple { background: linear-gradient(135deg, #3d4fa4 0%, #8b7fd4 100%); }

.about-image {
  width: 100%;
  border-radius: var(--radius-lg);
  box-shadow: var(--shadow-lg);
  object-fit: cover;
  max-height: 480px;
}

.hero-scroll-hint {
  position: absolute;
  bottom: 36px;
  left: 50%;
  transform: translateX(-50%);
  display: flex;
  flex-direction: column;
  align-items: center;
}
.hero-scroll-hint span {
  display: block;
  width: 2px;
  height: 40px;
  background: linear-gradient(to bottom, rgba(255,255,255,.4), transparent);
  animation: scrollHint 1.8s ease-in-out infinite;
}
@keyframes scrollHint {
  0%, 100% { opacity: 0.4; transform: scaleY(1); }
  50% { opacity: 1; transform: scaleY(0.6); }
}

/* ============================================================
   TRUST STRIP
   ============================================================ */
.trust-strip {
  background: var(--navy-mid);
  border-top: 1px solid rgba(255,255,255,.06);
  border-bottom: 1px solid rgba(255,255,255,.06);
  padding-block: 20px;
}

.trust-inner {
  display: flex;
  align-items: center;
  justify-content: center;
  flex-wrap: wrap;
  gap: 12px 0;
}

.trust-item {
  display: flex;
  align-items: center;
  gap: 10px;
  font-size: 0.875rem;
  color: rgba(255,255,255,.7);
  padding-inline: 24px;
}
.trust-item strong { color: var(--white); }
.trust-icon { color: var(--blue-light); font-size: 0.5rem; }

.trust-divider {
  width: 1px;
  height: 28px;
  background: rgba(255,255,255,.12);
  flex-shrink: 0;
}

/* ============================================================
   ABOUT
   ============================================================ */
.about { background: var(--white); }

.about-inner {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 64px;
  align-items: center;
}

.about-text p {
  color: var(--text-muted);
  margin-bottom: 16px;
  font-size: 1rem;
  line-height: 1.75;
}
.about-text p:last-child { margin-bottom: 0; }

.about-visual {
  display: flex;
  flex-direction: column;
  gap: 16px;
}

.visual-card {
  background: var(--off-white);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 24px;
  display: flex;
  align-items: center;
  gap: 20px;
  transition: box-shadow var(--transition);
}
.visual-card:hover { box-shadow: var(--shadow); }

.visual-icon {
  font-size: 1.75rem;
  flex-shrink: 0;
}

.visual-stat {
  font-size: 1.05rem;
  font-weight: 700;
  color: var(--navy);
  margin-bottom: 2px;
}

.visual-label {
  font-size: 0.85rem;
  color: var(--slate);
}

/* ============================================================
   TREATMENT MODALITIES
   ============================================================ */
.modalities { background: var(--navy); }
.modalities .section-tag { background: rgba(79,179,232,.12); color: var(--blue-light); border-color: rgba(79,179,232,.2); }
.modalities .section-title { color: var(--white); }

.modalities-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 24px;
  margin-top: 48px;
}

.modality-card {
  background: rgba(255,255,255,.04);
  border: 1px solid rgba(255,255,255,.1);
  border-radius: var(--radius-lg);
  padding: 36px 28px;
  transition: background var(--transition), transform var(--transition);
}
.modality-card:hover {
  background: rgba(255,255,255,.07);
  transform: translateY(-4px);
}

.modality-icon {
  font-size: 2rem;
  margin-bottom: 16px;
}

.modality-card h3 {
  font-size: 1.15rem;
  font-weight: 700;
  color: var(--white);
  margin-bottom: 12px;
}

.modality-card p {
  font-size: 0.9rem;
  color: rgba(255,255,255,.6);
  line-height: 1.7;
}

@media (max-width: 900px) {
  .modalities-grid { grid-template-columns: 1fr; }
}

/* ============================================================
   AUDIENCE
   ============================================================ */
.audience { background: var(--off-white); }

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

.audience-card {
  background: var(--white);
}

.card-icon {
  font-size: 1.75rem;
  margin-bottom: 14px;
}

.audience-card h3 {
  font-size: 1.05rem;
  font-weight: 700;
  color: var(--navy);
  margin-bottom: 10px;
}

.audience-card p {
  font-size: 0.9rem;
  color: var(--text-muted);
  line-height: 1.65;
}

/* ============================================================
   HOW IT WORKS
   ============================================================ */
.how-it-works { background: var(--navy); }

.how-it-works .section-tag { background: rgba(79,179,232,.12); color: var(--blue-light); border-color: rgba(79,179,232,.2); }
.how-it-works .section-title { color: var(--white); }
.how-it-works .section-intro { color: rgba(255,255,255,.6); }

.steps {
  display: flex;
  flex-direction: column;
  gap: 0;
  max-width: 760px;
  margin-inline: auto;
}

.step {
  display: grid;
  grid-template-columns: 64px 1fr;
  gap: 24px;
  align-items: start;
}

.step-number {
  font-size: 2.5rem;
  font-weight: 800;
  color: var(--blue-light);
  line-height: 1;
  opacity: 0.6;
  font-variant-numeric: tabular-nums;
  letter-spacing: -0.04em;
  padding-top: 4px;
}

.step-body {
  padding: 28px;
  background: rgba(255,255,255,.04);
  border: 1px solid rgba(255,255,255,.08);
  border-radius: var(--radius);
}

.step-body h3 {
  font-size: 1.1rem;
  font-weight: 700;
  color: var(--white);
  margin-bottom: 8px;
}

.step-body p {
  font-size: 0.95rem;
  color: rgba(255,255,255,.6);
  line-height: 1.65;
}

.step-connector {
  width: 2px;
  height: 24px;
  background: linear-gradient(to bottom, rgba(79,179,232,.4), rgba(79,179,232,.1));
  margin-left: 31px;
}

/* ============================================================
   FEATURES
   ============================================================ */
.features { background: var(--off-white); }

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

.feature-card {
  background: var(--white);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 32px 28px;
  transition: box-shadow var(--transition), transform var(--transition), border-color var(--transition);
}
.feature-card:hover {
  box-shadow: var(--shadow);
  transform: translateY(-4px);
  border-color: rgba(29,111,164,.2);
}

.feature-icon-wrap {
  width: 52px;
  height: 52px;
  background: var(--blue-pale);
  border-radius: 12px;
  display: flex;
  align-items: center;
  justify-content: center;
  margin-bottom: 20px;
}

.feature-icon { font-size: 1.4rem; }

.feature-card h3 {
  font-size: 1rem;
  font-weight: 700;
  color: var(--navy);
  margin-bottom: 10px;
}

.feature-card p {
  font-size: 0.9rem;
  color: var(--text-muted);
  line-height: 1.65;
}

/* 5-card grid: 3 + 2 centered */
.features-grid .feature-card:nth-child(4) {
  grid-column: 1 / 2;
}
.features-grid .feature-card:nth-child(5) {
  grid-column: 2 / 4;
}

/* ============================================================
   CLINICAL RATIONALE
   ============================================================ */
.rationale { background: var(--white); }

.rationale-inner {
  display: grid;
  grid-template-columns: 3fr 2fr;
  gap: 64px;
  align-items: start;
}

.rationale-text p {
  color: var(--text-muted);
  margin-bottom: 16px;
  font-size: 1rem;
  line-height: 1.75;
}
.rationale-text p:last-child { margin-bottom: 0; }

.rationale-note {
  background: var(--blue-pale);
  border-left: 3px solid var(--blue);
  border-radius: 0 var(--radius-sm) var(--radius-sm) 0;
  padding: 14px 18px !important;
  font-size: 0.875rem !important;
  color: var(--blue) !important;
  margin-top: 24px;
}

.rationale-pillars {
  display: flex;
  flex-direction: column;
  gap: 10px;
  padding-top: 60px;
}

.pillar {
  background: linear-gradient(90deg, var(--blue-pale) 0%, rgba(232,244,251,.4) 100%);
  border: 1px solid rgba(29,111,164,.15);
  border-radius: var(--radius-sm);
  padding: 14px 18px;
  transition: background var(--transition);
}
.pillar:hover {
  background: linear-gradient(90deg, rgba(29,111,164,.12) 0%, var(--blue-pale) 100%);
}

.pillar-label {
  font-size: 0.875rem;
  font-weight: 600;
  color: var(--blue);
}

/* ============================================================
   TRACK RECORD
   ============================================================ */
.track-record { background: var(--off-white); }

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

@media (max-width: 900px) {
  .track-grid { grid-template-columns: 1fr; }
}

.track-card {
  background: var(--white);
  border: 1px solid var(--border);
  border-radius: var(--radius-lg);
  padding: 36px;
  display: flex;
  gap: 24px;
  align-items: flex-start;
  transition: box-shadow var(--transition), transform var(--transition);
}
.track-card:hover {
  box-shadow: var(--shadow-lg);
  transform: translateY(-4px);
}

.track-logo {
  flex-shrink: 0;
  width: 64px;
  height: 64px;
  background: var(--navy);
  border-radius: var(--radius);
  display: flex;
  align-items: center;
  justify-content: center;
}
.track-icon { font-size: 1.75rem; }
.track-logo img {
  width: 64px;
  height: 64px;
  object-fit: contain;
  border-radius: var(--radius);
}

.track-content { flex: 1; }

.track-badge {
  display: inline-block;
  font-size: 0.7rem;
  font-weight: 700;
  letter-spacing: 0.1em;
  text-transform: uppercase;
  color: var(--blue);
  background: var(--blue-pale);
  border: 1px solid rgba(29,111,164,.2);
  padding: 3px 10px;
  border-radius: 100px;
  margin-bottom: 10px;
}

.track-content h3 {
  font-size: 1.1rem;
  font-weight: 700;
  color: var(--navy);
  margin-bottom: 10px;
}

.track-content p {
  font-size: 0.9rem;
  color: var(--text-muted);
  line-height: 1.65;
}

/* ============================================================
   DEMO / CONTACT FORM
   ============================================================ */
.demo {
  background: linear-gradient(135deg, var(--navy) 0%, var(--navy-light) 100%);
}

.demo-inner {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 64px;
  align-items: start;
}

.demo .section-tag { background: rgba(79,179,232,.12); color: var(--blue-light); border-color: rgba(79,179,232,.2); }
.demo .section-title { color: var(--white); }

.demo-text > p {
  color: rgba(255,255,255,.7);
  margin-bottom: 28px;
  font-size: 1.05rem;
  line-height: 1.7;
}

.demo-list {
  margin-bottom: 36px;
}
.demo-list li {
  display: flex;
  align-items: flex-start;
  gap: 12px;
  color: rgba(255,255,255,.75);
  font-size: 0.95rem;
  margin-bottom: 12px;
  line-height: 1.5;
}
.demo-list li::before {
  content: '→';
  color: var(--blue-light);
  font-weight: 700;
  flex-shrink: 0;
  margin-top: 1px;
}

/* FORM */
.demo-form-wrap {
  padding-top: 60px;
}

.demo-form {
  background: rgba(255,255,255,.05);
  border: 1px solid rgba(255,255,255,.1);
  backdrop-filter: blur(8px);
  border-radius: var(--radius-lg);
  padding: 36px;
}

.demo-form h3 {
  font-size: 1.15rem;
  font-weight: 700;
  color: var(--white);
  margin-bottom: 24px;
}

.form-group {
  margin-bottom: 18px;
}

.form-group label {
  display: block;
  font-size: 0.825rem;
  font-weight: 600;
  color: rgba(255,255,255,.7);
  margin-bottom: 6px;
  letter-spacing: 0.02em;
}

.form-group input,
.form-group textarea {
  width: 100%;
  background: rgba(255,255,255,.07);
  border: 1px solid rgba(255,255,255,.15);
  border-radius: var(--radius-sm);
  padding: 10px 14px;
  font-size: 0.925rem;
  color: var(--white);
  font-family: var(--font);
  transition: border-color var(--transition), background var(--transition);
  outline: none;
  resize: vertical;
}
.form-group input::placeholder,
.form-group textarea::placeholder {
  color: rgba(255,255,255,.3);
}
.form-group input:focus,
.form-group textarea:focus {
  border-color: var(--blue-light);
  background: rgba(255,255,255,.10);
}
.form-group input.error,
.form-group textarea.error {
  border-color: #e05a5a;
}

.form-error {
  display: block;
  font-size: 0.78rem;
  color: #f08080;
  margin-top: 4px;
  min-height: 18px;
}

.form-success {
  text-align: center;
  font-size: 0.9rem;
  color: #6ee7b7;
  margin-top: 14px;
  min-height: 24px;
  font-weight: 600;
}

/* ============================================================
   FOOTER
   ============================================================ */
.footer {
  background: var(--navy);
  border-top: 1px solid rgba(255,255,255,.06);
}

.footer-inner {
  display: grid;
  grid-template-columns: 2fr 1fr 1fr;
  gap: 48px;
  padding-block: 72px;
}

.footer-logo {
  font-size: 1.5rem;
  font-weight: 800;
  color: var(--white);
  letter-spacing: -0.02em;
  margin-bottom: 10px;
}
.footer-logo span { color: var(--blue-light); }

.footer-tagline {
  font-size: 0.9rem;
  color: rgba(255,255,255,.5);
  margin-bottom: 6px;
}

.footer-built {
  font-size: 0.8rem;
  color: rgba(255,255,255,.35);
}

.footer-contact h4,
.footer-nav h4 {
  font-size: 0.75rem;
  font-weight: 700;
  letter-spacing: 0.1em;
  text-transform: uppercase;
  color: rgba(255,255,255,.4);
  margin-bottom: 18px;
}

.contact-item {
  display: flex;
  flex-direction: column;
  margin-bottom: 12px;
}
.contact-label {
  font-size: 0.75rem;
  font-weight: 600;
  color: rgba(255,255,255,.35);
  text-transform: uppercase;
  letter-spacing: 0.08em;
  margin-bottom: 2px;
}
.contact-item a,
.contact-item span {
  font-size: 0.9rem;
  color: rgba(255,255,255,.7);
  transition: color var(--transition);
}
.contact-item a:hover { color: var(--blue-light); }

.footer-nav {
  display: flex;
  flex-direction: column;
}
.footer-nav a {
  font-size: 0.875rem;
  color: rgba(255,255,255,.55);
  margin-bottom: 10px;
  transition: color var(--transition);
}
.footer-nav a:hover { color: var(--white); }

.footer-bottom {
  border-top: 1px solid rgba(255,255,255,.06);
  padding-block: 20px;
}
.footer-bottom p {
  font-size: 0.78rem;
  color: rgba(255,255,255,.3);
  text-align: center;
  line-height: 1.6;
}

/* ============================================================
   SCROLL REVEAL ANIMATION
   ============================================================ */
.reveal {
  opacity: 0;
  transform: translateY(24px);
  transition: opacity 0.55s ease, transform 0.55s ease;
}
.reveal.visible {
  opacity: 1;
  transform: translateY(0);
}

/* ============================================================
   RESPONSIVE
   ============================================================ */
@media (max-width: 1024px) {
  .about-inner { grid-template-columns: 1fr; gap: 48px; }
  .about-visual { flex-direction: row; flex-wrap: wrap; }
  .visual-card { flex: 1 1 calc(50% - 8px); }

  .rationale-inner { grid-template-columns: 1fr; gap: 40px; }
  .rationale-pillars { padding-top: 0; flex-direction: row; flex-wrap: wrap; }
  .pillar { flex: 1 1 calc(33% - 8px); }
}

@media (max-width: 900px) {
  .cards-grid { grid-template-columns: repeat(2, 1fr); }
  .features-grid { grid-template-columns: repeat(2, 1fr); }
  .features-grid .feature-card:nth-child(4) { grid-column: auto; }
  .features-grid .feature-card:nth-child(5) { grid-column: auto; }

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

  .demo-inner { grid-template-columns: 1fr; gap: 40px; }
  .demo-form-wrap { padding-top: 0; }

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

@media (max-width: 768px) {
  :root { font-size: 15px; }
  .section { padding-block: 64px; }

  .nav-links {
    display: none;
    position: fixed;
    top: 68px; left: 0; right: 0;
    background: var(--navy);
    flex-direction: column;
    align-items: flex-start;
    padding: 24px;
    gap: 0;
    border-top: 1px solid rgba(255,255,255,.07);
    box-shadow: 0 8px 32px rgba(0,0,0,.4);
  }
  .nav-links.open { display: flex; }
  .nav-links a {
    width: 100%;
    padding-block: 14px;
    border-bottom: 1px solid rgba(255,255,255,.06);
    font-size: 1rem;
  }
  .nav-links .btn { margin-left: 0; margin-top: 16px; width: 100%; justify-content: center; }

  .nav-toggle { display: flex; }

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

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

  .step { grid-template-columns: 48px 1fr; }
  .step-number { font-size: 1.8rem; }
  .step-connector { margin-left: 23px; }

  .trust-inner { flex-direction: column; align-items: flex-start; gap: 12px; }
  .trust-divider { display: none; }

  .footer-inner { grid-template-columns: 1fr; gap: 32px; }
}

@media (max-width: 480px) {
  .hero-actions { flex-direction: column; }
  .btn-outline, .btn-primary { width: 100%; justify-content: center; }

  .about-visual { flex-direction: column; }
  .visual-card { flex: 1 1 100%; }

  .track-card { flex-direction: column; }

  .rationale-pillars { flex-direction: column; }
  .pillar { flex: 1 1 100%; }
}