/* =========================================
   VFWA — Voice-First Written Assessment
   Design System & Styles
   ========================================= */

/* ---------- Google Font ---------- */
@import url('https://fonts.googleapis.com/css2?family=Inter:wght@300;400;500;600;700;800;900&display=swap');

/* ---------- Custom Properties ---------- */
:root {
  --oxford-blue: #002147;
  --oxford-blue-dark: #001633;
  --oxford-blue-light: #003366;
  --magenta: #E6007E;
  --magenta-hover: #cc006e;
  --magenta-light: #ff3399;
  --white: #FFFFFF;
  --light-grey: #F3F3F3;
  --dark-text: #1a1a2e;
  --body-text: #3a3a4a;
  --border-light: rgba(230, 0, 126, 0.15);

  --font-main: 'Inter', -apple-system, BlinkMacSystemFont, sans-serif;
  --radius-sm: 8px;
  --radius-md: 16px;
  --radius-lg: 24px;
  --shadow-card: 0 8px 32px rgba(0, 33, 71, 0.08);
  --shadow-hover: 0 12px 48px rgba(0, 33, 71, 0.14);
  --transition: 0.3s cubic-bezier(0.4, 0, 0.2, 1);
}

/* ---------- Reset ---------- */
*, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }
html { scroll-behavior: smooth; font-size: 18px; }
body {
  font-family: var(--font-main);
  color: var(--dark-text);
  line-height: 1.7;
  background: var(--white);
  overflow-x: hidden;
}
img { max-width: 100%; display: block; }
a { text-decoration: none; color: inherit; }
ul { list-style: none; }

/* ---------- Typography ---------- */
h1, h2, h3, h4, h5 { line-height: 1.2; font-weight: 700; }
h1 { font-size: clamp(2rem, 5vw, 3.2rem); }
h2 { font-size: clamp(1.6rem, 4vw, 2.4rem); }
h3 { font-size: clamp(1.2rem, 3vw, 1.6rem); }
p { color: var(--body-text); }

.section-label {
  display: inline-block;
  font-size: 0.75rem;
  font-weight: 700;
  letter-spacing: 3px;
  text-transform: uppercase;
  color: var(--magenta);
  margin-bottom: 0.75rem;
}

.section-title {
  margin-bottom: 1.25rem;
}

.section-subtitle {
  font-size: 1.1rem;
  color: var(--body-text);
  max-width: 680px;
  margin: 0 auto 2.5rem;
}

/* ---------- Container ---------- */
.container {
  width: 100%;
  max-width: 1200px;
  margin: 0 auto;
  padding: 0 2rem;
}

/* ---------- Section Padding ---------- */
.section {
  padding: 6rem 0;
}
.section--dark {
  background: var(--oxford-blue);
  color: var(--white);
}
.section--dark p { color: rgba(255,255,255,0.8); }
.section--dark .section-label { color: var(--magenta-light); }
.section--grey {
  background: var(--light-grey);
}
.text-center { text-align: center; }

/* =========================================
   NAVIGATION
   ========================================= */
.nav {
  position: fixed;
  top: 0; left: 0; right: 0;
  z-index: 1000;
  background: rgba(0, 33, 71, 0.92);
  backdrop-filter: blur(20px);
  -webkit-backdrop-filter: blur(20px);
  border-bottom: 1px solid rgba(255,255,255,0.06);
  transition: var(--transition);
}
.nav__inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: 72px;
}
.nav__logo {
  font-weight: 800;
  font-size: 1.1rem;
  color: var(--white);
  display: flex;
  align-items: center;
  gap: 0.5rem;
}
.nav__logo-accent { color: var(--magenta); }
.nav__links {
  display: flex;
  gap: 2rem;
  align-items: center;
}
.nav__links a {
  color: rgba(255,255,255,0.75);
  font-size: 0.82rem;
  font-weight: 500;
  transition: var(--transition);
  position: relative;
}
.nav__links a::after {
  content: '';
  position: absolute;
  bottom: -4px; left: 0;
  width: 0; height: 2px;
  background: var(--magenta);
  transition: var(--transition);
}
.nav__links a:hover { color: var(--white); }
.nav__links a:hover::after { width: 100%; }

/* Hamburger */
.nav__hamburger {
  display: none;
  flex-direction: column;
  gap: 5px;
  cursor: pointer;
  padding: 4px;
}
.nav__hamburger span {
  width: 24px; height: 2px;
  background: var(--white);
  transition: var(--transition);
  border-radius: 2px;
}

/* =========================================
   HERO
   ========================================= */
.hero {
  position: relative;
  min-height: 100vh;
  display: flex;
  align-items: center;
  justify-content: center;
  background: var(--oxford-blue);
  overflow: hidden;
  padding-top: 72px;
}

/* Animated network background */
.hero__network {
  position: absolute;
  inset: 0;
  background:
    radial-gradient(circle at 20% 30%, rgba(230, 0, 126, 0.08) 0%, transparent 50%),
    radial-gradient(circle at 80% 70%, rgba(230, 0, 126, 0.06) 0%, transparent 50%),
    radial-gradient(circle at 50% 50%, rgba(0, 51, 102, 0.4) 0%, transparent 70%);
}

/* Animated dots */
.hero__dots {
  position: absolute;
  inset: 0;
  overflow: hidden;
}
.hero__dot {
  position: absolute;
  width: 4px; height: 4px;
  background: rgba(230, 0, 126, 0.4);
  border-radius: 50%;
  animation: pulse-dot 4s ease-in-out infinite;
}
.hero__dot:nth-child(1) { top: 15%; left: 10%; animation-delay: 0s; }
.hero__dot:nth-child(2) { top: 25%; left: 85%; animation-delay: 0.5s; }
.hero__dot:nth-child(3) { top: 60%; left: 20%; animation-delay: 1s; }
.hero__dot:nth-child(4) { top: 75%; left: 75%; animation-delay: 1.5s; }
.hero__dot:nth-child(5) { top: 40%; left: 50%; animation-delay: 2s; }
.hero__dot:nth-child(6) { top: 85%; left: 35%; animation-delay: 2.5s; }
.hero__dot:nth-child(7) { top: 10%; left: 60%; animation-delay: 0.8s; }
.hero__dot:nth-child(8) { top: 50%; left: 90%; animation-delay: 1.3s; }
.hero__dot:nth-child(9) { top: 30%; left: 40%; animation-delay: 1.8s; }
.hero__dot:nth-child(10) { top: 70%; left: 55%; animation-delay: 0.3s; }
.hero__dot--lg { width: 6px; height: 6px; background: rgba(230, 0, 126, 0.6); }

/* Connecting lines */
.hero__lines {
  position: absolute;
  inset: 0;
  opacity: 0.15;
}
.hero__line {
  position: absolute;
  height: 1px;
  background: linear-gradient(90deg, transparent, var(--magenta), transparent);
  animation: sweep-line 8s linear infinite;
}
.hero__line:nth-child(1) { top: 20%; left: 5%; width: 30%; transform: rotate(15deg); animation-delay: 0s; }
.hero__line:nth-child(2) { top: 50%; left: 55%; width: 35%; transform: rotate(-10deg); animation-delay: 2s; }
.hero__line:nth-child(3) { top: 70%; left: 15%; width: 25%; transform: rotate(8deg); animation-delay: 4s; }
.hero__line:nth-child(4) { top: 35%; left: 40%; width: 20%; transform: rotate(-20deg); animation-delay: 6s; }

@keyframes pulse-dot {
  0%, 100% { transform: scale(1); opacity: 0.4; }
  50% { transform: scale(2.5); opacity: 1; }
}
@keyframes sweep-line {
  0% { opacity: 0; }
  50% { opacity: 0.3; }
  100% { opacity: 0; }
}

.hero__content {
  position: relative;
  z-index: 2;
  text-align: center;
  max-width: 900px;
  padding: 2rem;
}
.hero__banner {
  display: inline-block;
  background: var(--magenta);
  padding: 1.5rem 3rem;
  border-radius: var(--radius-md);
  margin-bottom: 2rem;
  animation: fade-in-up 1s ease-out;
}
.hero__banner h1 {
  color: var(--white);
  font-weight: 900;
  line-height: 1.15;
}
.hero__tagline {
  font-size: clamp(1.1rem, 2.5vw, 1.5rem);
  color: rgba(255,255,255,0.9);
  font-weight: 300;
  margin-bottom: 1rem;
  animation: fade-in-up 1s ease-out 0.2s both;
}
.hero__credit {
  font-size: 0.9rem;
  color: rgba(255,255,255,0.55);
  margin-bottom: 2.5rem;
  animation: fade-in-up 1s ease-out 0.4s both;
}
.hero__cta {
  display: inline-flex;
  align-items: center;
  gap: 0.5rem;
  background: var(--white);
  color: var(--oxford-blue);
  font-weight: 600;
  padding: 1rem 2.5rem;
  border-radius: 100px;
  font-size: 0.95rem;
  transition: var(--transition);
  animation: fade-in-up 1s ease-out 0.6s both;
}
.hero__cta:hover {
  background: var(--magenta);
  color: var(--white);
  transform: translateY(-2px);
  box-shadow: 0 8px 30px rgba(230, 0, 126, 0.35);
}
.hero__scroll-hint {
  position: absolute;
  bottom: 2rem;
  left: 50%;
  transform: translateX(-50%);
  animation: bounce 2s infinite;
  color: rgba(255,255,255,0.4);
  font-size: 1.5rem;
}

@keyframes fade-in-up {
  from { opacity: 0; transform: translateY(30px); }
  to { opacity: 1; transform: translateY(0); }
}
@keyframes bounce {
  0%, 100% { transform: translateX(-50%) translateY(0); }
  50% { transform: translateX(-50%) translateY(10px); }
}

/* =========================================
   PROBLEM SECTION
   ========================================= */
.problem__grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(320px, 1fr));
  gap: 2rem;
  margin-top: 2rem;
}
.problem__card {
  background: var(--white);
  border-radius: var(--radius-md);
  padding: 2.5rem;
  box-shadow: var(--shadow-card);
  border: 1px solid var(--border-light);
  transition: var(--transition);
  position: relative;
  overflow: hidden;
}
.problem__card::before {
  content: '';
  position: absolute;
  top: 0; left: 0;
  width: 4px; height: 100%;
  background: var(--magenta);
  transform: scaleY(0);
  transition: var(--transition);
  transform-origin: top;
}
.problem__card:hover {
  transform: translateY(-4px);
  box-shadow: var(--shadow-hover);
}
.problem__card:hover::before { transform: scaleY(1); }
.problem__icon {
  width: 56px; height: 56px;
  background: linear-gradient(135deg, var(--magenta), var(--magenta-light));
  border-radius: var(--radius-sm);
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 1.5rem;
  margin-bottom: 1.25rem;
  color: var(--white);
}
.problem__card h3 { margin-bottom: 0.75rem; color: var(--oxford-blue); }
.problem__card p { font-size: 0.95rem; }

/* =========================================
   MODEL OVERVIEW (Two-Stage Visual)
   ========================================= */
.model__visual {
  display: grid;
  grid-template-columns: 1fr auto 1fr;
  gap: 0;
  align-items: stretch;
  margin: 3rem 0;
  max-width: 1000px;
  margin-left: auto;
  margin-right: auto;
}
.model__stage {
  background: rgba(255,255,255,0.06);
  border: 1px solid rgba(255,255,255,0.12);
  border-radius: var(--radius-lg);
  padding: 2.5rem 2rem;
  backdrop-filter: blur(12px);
  transition: var(--transition);
  position: relative;
}
.model__stage:hover {
  background: rgba(255,255,255,0.1);
  border-color: var(--magenta);
  transform: translateY(-4px);
}
.model__stage-number {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 48px; height: 48px;
  background: var(--magenta);
  border-radius: 50%;
  font-weight: 800;
  font-size: 1.2rem;
  color: var(--white);
  margin-bottom: 1rem;
}
.model__stage h3 {
  font-size: 1.3rem;
  margin-bottom: 0.5rem;
}
.model__stage-subtitle {
  font-size: 0.85rem;
  color: var(--magenta-light);
  font-weight: 600;
  letter-spacing: 1px;
  text-transform: uppercase;
  margin-bottom: 1rem;
}
.model__stage p {
  font-size: 0.95rem;
  color: rgba(255,255,255,0.75);
}
.model__stage-features {
  margin-top: 1.5rem;
  display: flex;
  flex-direction: column;
  gap: 0.75rem;
}
.model__feature {
  display: flex;
  align-items: center;
  gap: 0.75rem;
  font-size: 0.9rem;
  color: rgba(255,255,255,0.85);
}
.model__feature-icon {
  width: 32px; height: 32px;
  background: rgba(230, 0, 126, 0.15);
  border-radius: 8px;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 0.9rem;
  flex-shrink: 0;
}

/* Arrow connector */
.model__arrow {
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  padding: 0 1.5rem;
  position: relative;
}
.model__arrow-line {
  width: 3px;
  flex: 1;
  background: linear-gradient(180deg, var(--magenta), rgba(230, 0, 126, 0.3));
  border-radius: 2px;
  position: relative;
}
.model__arrow-label {
  background: var(--magenta);
  color: var(--white);
  font-size: 0.7rem;
  font-weight: 700;
  letter-spacing: 1px;
  padding: 0.5rem 1rem;
  border-radius: 100px;
  white-space: nowrap;
  margin: 1rem 0;
}
.model__arrow-icon {
  font-size: 1.5rem;
  color: var(--magenta);
  animation: bounce 2s infinite;
}

/* =========================================
   STAGE DETAIL SECTIONS
   ========================================= */
.stage-detail {
  padding: 5rem 0;
}
.stage-detail__header {
  display: flex;
  align-items: center;
  gap: 1.25rem;
  margin-bottom: 1.5rem;
}
.stage-detail__badge {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 56px; height: 56px;
  background: var(--magenta);
  border-radius: 50%;
  font-weight: 800;
  font-size: 1.4rem;
  color: var(--white);
  flex-shrink: 0;
}
.stage-detail__title { color: var(--oxford-blue); }

.stage-detail__cards {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(260px, 1fr));
  gap: 1.5rem;
  margin-top: 2rem;
}
.detail-card {
  background: var(--white);
  border-radius: var(--radius-md);
  padding: 2rem;
  box-shadow: var(--shadow-card);
  border: 1px solid var(--border-light);
  transition: var(--transition);
  text-align: center;
}
.detail-card:hover {
  transform: translateY(-4px);
  box-shadow: var(--shadow-hover);
  border-color: var(--magenta);
}
.detail-card__icon {
  width: 64px; height: 64px;
  background: linear-gradient(135deg, rgba(230, 0, 126, 0.08), rgba(230, 0, 126, 0.02));
  border: 2px solid rgba(230, 0, 126, 0.15);
  border-radius: var(--radius-md);
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 1.6rem;
  margin: 0 auto 1.25rem;
  transition: var(--transition);
}
.detail-card:hover .detail-card__icon {
  background: var(--magenta);
  border-color: var(--magenta);
  transform: scale(1.1);
}
.detail-card:hover .detail-card__icon span { filter: brightness(10); }
.detail-card h4 { color: var(--oxford-blue); margin-bottom: 0.5rem; font-size: 1rem; }
.detail-card p { font-size: 0.88rem; }

/* Key quote callout */
.callout {
  background: linear-gradient(135deg, var(--oxford-blue), var(--oxford-blue-light));
  border-radius: var(--radius-lg);
  padding: 2.5rem 3rem;
  margin: 3rem 0;
  position: relative;
  overflow: hidden;
}
.callout::before {
  content: '"';
  position: absolute;
  top: -20px; left: 20px;
  font-size: 8rem;
  font-weight: 900;
  color: rgba(230, 0, 126, 0.15);
  line-height: 1;
}
.callout p {
  color: var(--white);
  font-size: 1.2rem;
  font-weight: 500;
  font-style: italic;
  position: relative;
  z-index: 1;
}
.callout cite {
  display: block;
  margin-top: 1rem;
  color: var(--magenta-light);
  font-size: 0.85rem;
  font-style: normal;
  font-weight: 600;
}

/* =========================================
   SAFEGUARD SECTION
   ========================================= */
.safeguard__content {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 3rem;
  align-items: center;
}
.safeguard__visual {
  position: relative;
}
.safeguard__diagram {
  background: var(--white);
  border-radius: var(--radius-lg);
  padding: 3rem;
  box-shadow: var(--shadow-card);
  border: 2px solid var(--border-light);
}
.safeguard__flow {
  display: flex;
  flex-direction: column;
  gap: 1rem;
  align-items: center;
}
.safeguard__node {
  width: 100%;
  padding: 1rem 1.5rem;
  border-radius: var(--radius-sm);
  text-align: center;
  font-weight: 600;
  font-size: 0.9rem;
  transition: var(--transition);
}
.safeguard__node--stage1 {
  background: rgba(0, 33, 71, 0.06);
  border: 2px solid var(--oxford-blue);
  color: var(--oxford-blue);
}
.safeguard__node--check {
  background: rgba(230, 0, 126, 0.06);
  border: 2px dashed var(--magenta);
  color: var(--magenta);
}
.safeguard__node--viva {
  background: var(--magenta);
  color: var(--white);
  border: 2px solid var(--magenta);
}
.safeguard__node--pass {
  background: rgba(0, 33, 71, 0.06);
  border: 2px solid var(--oxford-blue);
  color: var(--oxford-blue);
}
.safeguard__connector {
  width: 2px;
  height: 20px;
  background: var(--oxford-blue);
  position: relative;
}
.safeguard__connector::after {
  content: '▼';
  position: absolute;
  bottom: -8px;
  left: 50%;
  transform: translateX(-50%);
  font-size: 0.6rem;
  color: var(--oxford-blue);
}
.safeguard__text h3 { color: var(--oxford-blue); margin-bottom: 1rem; }
.safeguard__text p { margin-bottom: 1rem; }
.safeguard__highlight {
  background: rgba(230, 0, 126, 0.06);
  border-left: 4px solid var(--magenta);
  padding: 1rem 1.5rem;
  border-radius: 0 var(--radius-sm) var(--radius-sm) 0;
  margin-top: 1.5rem;
}
.safeguard__highlight p {
  color: var(--oxford-blue);
  font-weight: 500;
  font-size: 0.92rem;
}

/* =========================================
   EXAMPLES SECTION
   ========================================= */
.examples__grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(320px, 1fr));
  gap: 2rem;
  margin-top: 2rem;
}
.example-card {
  background: rgba(255,255,255,0.07);
  border: 1px solid rgba(255,255,255,0.12);
  border-radius: var(--radius-lg);
  padding: 2.5rem 2rem;
  backdrop-filter: blur(12px);
  transition: var(--transition);
  position: relative;
  overflow: hidden;
}
.example-card::before {
  content: '';
  position: absolute;
  top: 0; left: 0; right: 0;
  height: 4px;
  background: var(--magenta);
  transform: scaleX(0);
  transition: var(--transition);
}
.example-card:hover {
  background: rgba(255,255,255,0.12);
  transform: translateY(-4px);
  border-color: rgba(230, 0, 126, 0.4);
}
.example-card:hover::before { transform: scaleX(1); }

.example-card__discipline {
  display: inline-block;
  background: var(--magenta);
  color: var(--white);
  font-size: 0.7rem;
  font-weight: 700;
  letter-spacing: 2px;
  text-transform: uppercase;
  padding: 0.35rem 1rem;
  border-radius: 100px;
  margin-bottom: 1rem;
}
.example-card h3 {
  font-size: 1.15rem;
  margin-bottom: 1rem;
}
.example-card__stages {
  display: flex;
  flex-direction: column;
  gap: 1rem;
}
.example-stage {
  padding: 1rem 1.25rem;
  border-radius: var(--radius-sm);
  background: rgba(255,255,255,0.05);
  border: 1px solid rgba(255,255,255,0.08);
}
.example-stage__label {
  font-size: 0.72rem;
  font-weight: 700;
  letter-spacing: 1.5px;
  text-transform: uppercase;
  color: var(--magenta-light);
  margin-bottom: 0.4rem;
}
.example-stage p {
  font-size: 0.88rem;
  color: rgba(255,255,255,0.75);
}

/* =========================================
   COMPASSION SECTION
   ========================================= */
.compassion__grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
  gap: 2rem;
  margin-top: 3rem;
}
.compassion-card {
  background: var(--white);
  border-radius: var(--radius-lg);
  padding: 2.5rem 2rem;
  box-shadow: var(--shadow-card);
  border: 1px solid var(--border-light);
  transition: var(--transition);
  text-align: center;
}
.compassion-card:hover {
  transform: translateY(-4px);
  box-shadow: var(--shadow-hover);
}
.compassion-card__icon {
  width: 72px; height: 72px;
  margin: 0 auto 1.5rem;
  background: linear-gradient(135deg, rgba(230, 0, 126, 0.1), rgba(0, 33, 71, 0.05));
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 2rem;
}
.compassion-card h3 { color: var(--oxford-blue); margin-bottom: 0.75rem; }
.compassion-card p { font-size: 0.92rem; }

.compassion__banner {
  margin-top: 3rem;
  background: var(--magenta);
  border-radius: var(--radius-lg);
  padding: 3rem;
  text-align: center;
}
.compassion__banner h3 {
  color: var(--white);
  font-size: 1.6rem;
  margin-bottom: 0.75rem;
}
.compassion__banner p {
  color: rgba(255,255,255,0.9);
  font-size: 1.1rem;
  max-width: 600px;
  margin: 0 auto;
}

/* =========================================
   RATIONALE TABLE
   ========================================= */
.rationale-table-wrapper {
  overflow-x: auto;
  margin-top: 2rem;
  border-radius: var(--radius-md);
  box-shadow: var(--shadow-card);
}
.rationale-table {
  width: 100%;
  border-collapse: collapse;
  font-size: 0.88rem;
  background: var(--white);
}
.rationale-table thead th {
  background: var(--oxford-blue);
  color: var(--white);
  padding: 1rem 1.25rem;
  text-align: left;
  font-weight: 600;
  font-size: 0.82rem;
  letter-spacing: 0.5px;
}
.rationale-table tbody td {
  padding: 1rem 1.25rem;
  border-bottom: 1px solid rgba(0,0,0,0.06);
  vertical-align: top;
}
.rationale-table tbody tr:hover { background: rgba(230, 0, 126, 0.03); }
.rationale-table tbody tr:last-child td { border-bottom: none; }
.rationale-table .feature-tag {
  display: inline-block;
  background: rgba(230, 0, 126, 0.08);
  color: var(--magenta);
  font-size: 0.75rem;
  font-weight: 600;
  padding: 0.2rem 0.6rem;
  border-radius: 4px;
}

/* =========================================
   FOOTER
   ========================================= */
.footer {
  background: var(--oxford-blue-dark);
  padding: 3rem 0 2rem;
  color: rgba(255,255,255,0.6);
}
.footer__inner {
  display: flex;
  justify-content: space-between;
  align-items: center;
  flex-wrap: wrap;
  gap: 1rem;
}
.footer__brand {
  font-weight: 700;
  font-size: 1rem;
  color: var(--white);
}
.footer__brand span { color: var(--magenta); }
.footer__info { font-size: 0.8rem; }
.footer__links {
  display: flex;
  gap: 1.5rem;
}
.footer__links a {
  font-size: 0.8rem;
  color: rgba(255,255,255,0.5);
  transition: var(--transition);
}
.footer__links a:hover { color: var(--magenta); }

/* =========================================
   SCROLL REVEAL ANIMATIONS
   ========================================= */
.reveal {
  opacity: 0;
  transform: translateY(30px);
  transition: opacity 0.6s ease-out, transform 0.6s ease-out;
}
.reveal.visible {
  opacity: 1;
  transform: translateY(0);
}
.reveal-delay-1 { transition-delay: 0.1s; }
.reveal-delay-2 { transition-delay: 0.2s; }
.reveal-delay-3 { transition-delay: 0.3s; }
.reveal-delay-4 { transition-delay: 0.4s; }

/* =========================================
   RESPONSIVE
   ========================================= */
@media (max-width: 900px) {
  .model__visual {
    grid-template-columns: 1fr;
    gap: 0;
  }
  .model__arrow {
    flex-direction: row;
    padding: 1rem 0;
  }
  .model__arrow-line {
    width: auto;
    height: 3px;
    flex: 1;
    background: linear-gradient(90deg, var(--magenta), rgba(230, 0, 126, 0.3));
  }
  .safeguard__content {
    grid-template-columns: 1fr;
  }
}

@media (max-width: 768px) {
  html { font-size: 16px; }
  .section { padding: 4rem 0; }
  .container { padding: 0 1.25rem; }
  .hero__banner { padding: 1.25rem 2rem; }
  .hero__cta { padding: 0.85rem 2rem; }

  .nav__links {
    display: none;
    position: absolute;
    top: 72px; left: 0; right: 0;
    background: var(--oxford-blue);
    flex-direction: column;
    padding: 2rem;
    gap: 1.25rem;
    border-top: 1px solid rgba(255,255,255,0.1);
  }
  .nav__links.active { display: flex; }
  .nav__hamburger { display: flex; }

  .problem__grid,
  .examples__grid,
  .compassion__grid {
    grid-template-columns: 1fr;
  }

  .callout { padding: 2rem; }
  .callout p { font-size: 1.05rem; }
}

@media (max-width: 480px) {
  .hero__banner h1 { font-size: 1.6rem; }
  .hero__tagline { font-size: 1rem; }
  .stage-detail__header { flex-direction: column; text-align: center; }
}