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

html {
  scroll-behavior: smooth;
  scroll-padding-top: var(--nav-height);
}

body {
  font-family: var(--font-family);
  font-size: var(--body-size);
  color: var(--color-ink);
  background: var(--color-bg);
  line-height: 1.6;
  -webkit-font-smoothing: antialiased;
}

a {
  color: inherit;
  text-decoration: none;
}

img { max-width: 100%; }

.container {
  max-width: var(--max-width);
  margin: 0 auto;
  padding: 0 var(--space-lg);
}

/* ========== Buttons ========== */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  padding: 12px 28px;
  border-radius: var(--border-radius-pill);
  font-family: var(--font-family);
  font-size: var(--body-size);
  font-weight: 600;
  cursor: pointer;
  border: 2px solid transparent;
  transition: all var(--transition-fast);
  text-decoration: none;
}

.btn--primary {
  background: var(--color-primary);
  color: var(--color-white);
}

.btn--primary:hover {
  background: #0a5a3b;
}

.btn--outline {
  background: transparent;
  color: var(--color-primary);
  border-color: var(--color-primary);
}

.btn--outline:hover {
  background: var(--color-surface);
}

.btn--white {
  background: var(--color-white);
  color: var(--color-primary);
}

.btn--white:hover {
  background: var(--color-surface);
}

.btn--white-outline {
  background: transparent;
  color: var(--color-white);
  border-color: var(--color-white);
}

.btn--white-outline:hover {
  background: rgba(255, 255, 255, 0.1);
}

.btn--sm {
  padding: 8px 20px;
  font-size: var(--body-size-sm);
}

/* ========== Navigation ========== */
.nav {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  z-index: 1000;
  height: var(--nav-height);
  background: rgba(250, 252, 251, 0.9);
  backdrop-filter: blur(12px);
  -webkit-backdrop-filter: blur(12px);
  border-bottom: 1px solid rgba(0, 0, 0, 0.06);
  transition: background var(--transition-base);
}

.nav--scrolled {
  background: rgba(250, 252, 251, 0.98);
  box-shadow: var(--shadow-sm);
}

.nav__inner {
  display: flex;
  align-items: center;
  height: 100%;
  gap: var(--space-lg);
}

.nav__logo {
  font-size: 18px;
  font-weight: 700;
  color: var(--color-primary);
  white-space: nowrap;
}

.nav__links {
  display: flex;
  align-items: center;
  gap: var(--space-lg);
  margin-left: auto;
}

.nav__links a {
  font-size: var(--body-size-sm);
  color: var(--color-ink);
  opacity: 0.7;
  transition: opacity var(--transition-fast);
  white-space: nowrap;
}

.nav__links a:hover {
  opacity: 1;
}

.nav__links .btn {
  opacity: 1;
  color: var(--color-white);
  font-weight: 700;
  letter-spacing: 0.02em;
}

.nav__signin {
  opacity: 0.7;
}

.nav__hamburger {
  display: none;
  flex-direction: column;
  gap: 5px;
  background: none;
  border: none;
  cursor: pointer;
  padding: 4px;
  margin-left: auto;
}

.nav__hamburger span {
  display: block;
  width: 22px;
  height: 2px;
  background: var(--color-ink);
  border-radius: 2px;
  transition: all var(--transition-fast);
}

.nav__hamburger.active span:nth-child(1) {
  transform: rotate(45deg) translate(5px, 5px);
}

.nav__hamburger.active span:nth-child(2) {
  opacity: 0;
}

.nav__hamburger.active span:nth-child(3) {
  transform: rotate(-45deg) translate(5px, -5px);
}

/* ========== Hero ========== */
.hero {
  padding-top: calc(var(--nav-height) + var(--space-3xl));
  padding-bottom: var(--space-3xl);
  text-align: center;
  background: var(--color-bg);
}

.hero__inner {
  display: flex;
  flex-direction: column;
  align-items: center;
}

.hero__badge {
  display: inline-flex;
  align-items: center;
  padding: 6px 16px;
  border-radius: var(--border-radius-pill);
  background: var(--color-surface);
  color: var(--color-primary);
  font-size: var(--body-size-sm);
  font-weight: 600;
  border: 1px solid var(--color-accent);
  margin-bottom: var(--space-xl);
}

.hero__title {
  font-size: var(--heading-size);
  font-weight: var(--heading-weight);
  line-height: 1.25;
  color: var(--color-ink);
  max-width: 680px;
  margin-bottom: var(--space-lg);
}

.hero__highlight {
  color: var(--color-primary);
}

.hero__subtitle {
  font-size: var(--body-size);
  color: var(--color-ink);
  opacity: 0.6;
  max-width: 560px;
  margin-bottom: var(--space-xl);
  line-height: 1.7;
}

.hero__ctas {
  display: flex;
  gap: var(--space-md);
  margin-bottom: var(--space-4xl);
}

/* ========== Phone Mockups ========== */
.hero__phones {
  display: flex;
  justify-content: center;
  gap: var(--space-xl);
  position: relative;
}

.phone {
  width: 240px;
  background: var(--color-white);
  border-radius: 32px;
  border: 3px solid #e0e0e0;
  box-shadow: var(--shadow-phone);
  overflow: hidden;
  position: relative;
}

.phone--safe {
  transform: rotate(-3deg) translateY(10px);
}

.phone--critical {
  transform: rotate(3deg) translateY(-10px);
}

.phone__notch {
  width: 80px;
  height: 6px;
  background: #e0e0e0;
  border-radius: 3px;
  margin: 12px auto 8px;
}

.phone__screen {
  padding: 0 12px 16px;
}

.phone__header {
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding: 8px 0;
  margin-bottom: 8px;
}

.phone__brand {
  font-size: 11px;
  font-weight: 700;
  color: var(--color-ink);
}

.phone__brand--critical {
  color: var(--color-critical);
}

.phone__time {
  font-size: 10px;
  color: #999;
}

.phone__score-card {
  background: var(--color-white);
  border: 1px solid #e8e8e8;
  border-radius: var(--border-radius-sm);
  padding: 12px;
  margin-bottom: 8px;
  text-align: center;
}

.phone__score-card--critical {
  border-color: var(--color-critical);
}

.phone__score-label {
  font-size: 8px;
  font-weight: 700;
  letter-spacing: 0.1em;
  color: #888;
  margin-bottom: 4px;
}

.phone__score {
  font-size: var(--score-size-lg);
  font-weight: var(--score-weight);
  line-height: 1;
  margin-bottom: 2px;
}

.phone__score--safe {
  color: var(--color-ink);
}

.phone__score--critical {
  color: var(--color-critical);
}

.phone__score-sub {
  font-size: 9px;
  color: #999;
  margin-bottom: 8px;
}

.phone__score-bar {
  height: 4px;
  background: #eee;
  border-radius: 2px;
  position: relative;
  margin-bottom: 4px;
}

.phone__score-bar-fill {
  height: 100%;
  border-radius: 2px;
  position: absolute;
  left: 0;
  top: 0;
}

.phone__score-bar-fill--safe {
  background: var(--color-accent);
}

.phone__score-bar-fill--critical {
  background: linear-gradient(to right, var(--color-accent), var(--color-warning), var(--color-critical));
}

.phone__score-bar-dot {
  width: 8px;
  height: 8px;
  background: var(--color-accent);
  border-radius: 50%;
  position: absolute;
  top: -2px;
  transform: translateX(-50%);
  border: 2px solid white;
}

.phone__score-range {
  display: flex;
  justify-content: space-between;
  font-size: 8px;
  color: #aaa;
  margin-bottom: 6px;
}

.phone__status {
  display: inline-block;
  padding: 3px 10px;
  border-radius: var(--border-radius-pill);
  font-size: 9px;
  font-weight: 600;
}

.phone__status--cleared {
  background: var(--color-surface);
  color: var(--color-accent);
}

.phone__chart-card {
  background: var(--color-white);
  border: 1px solid #e8e8e8;
  border-radius: var(--border-radius-sm);
  padding: 10px 12px;
  margin-bottom: 8px;
}

.phone__chart-card--critical {
  border-color: var(--color-critical);
}

.phone__chart-title {
  font-size: 8px;
  font-weight: 700;
  letter-spacing: 0.05em;
  color: var(--color-ink);
  margin-bottom: 2px;
}

.phone__chart-title--critical {
  color: var(--color-critical);
}

.phone__chart-sub {
  font-size: 8px;
  color: #999;
  margin-bottom: 6px;
}

.phone__chart-sub--critical {
  color: var(--color-critical);
  opacity: 0.7;
}

.phone__chart-svg {
  width: 100%;
  height: auto;
}

.phone__alert {
  background: #FFF5F5;
  border: 1px solid var(--color-critical);
  border-radius: var(--border-radius-sm);
  padding: 10px;
  text-align: center;
}

.phone__alert-icon {
  margin-bottom: 4px;
}

.phone__alert-content strong {
  font-size: 10px;
  color: var(--color-critical);
  display: block;
  margin-bottom: 3px;
}

.phone__alert-content p {
  font-size: 8px;
  color: #666;
  line-height: 1.4;
  margin-bottom: 8px;
}

.phone__alert-btn {
  display: block;
  width: 100%;
  padding: 6px;
  background: var(--color-critical);
  color: white;
  border: none;
  border-radius: 6px;
  font-size: 9px;
  font-weight: 600;
  cursor: pointer;
  margin-bottom: 4px;
}

.phone__alert-dismiss {
  font-size: 7px;
  color: var(--color-critical);
  opacity: 0.7;
}

/* ========== Section Base ========== */
.section {
  padding: var(--space-4xl) 0;
}

.section__header {
  text-align: center;
  margin-bottom: var(--space-3xl);
}

.section__tag {
  display: inline-block;
  font-size: var(--tag-size);
  font-weight: var(--tag-weight);
  letter-spacing: var(--tag-spacing);
  text-transform: uppercase;
  color: var(--color-primary);
  margin-bottom: var(--space-md);
}

.section__title {
  font-size: 28px;
  font-weight: var(--heading-weight);
  color: var(--color-ink);
  max-width: 640px;
  margin: 0 auto var(--space-md);
  line-height: 1.3;
}

.section__subtitle {
  font-size: var(--body-size);
  color: var(--color-ink);
  opacity: 0.6;
  max-width: 580px;
  margin: 0 auto;
  line-height: 1.7;
}

/* ========== How It Works ========== */
.how-it-works {
  background: var(--color-surface);
}

.steps {
  display: grid;
  gap: var(--space-lg);
  margin-bottom: var(--space-3xl);
}

.step {
  background: var(--color-white);
  border: 1px solid rgba(0, 0, 0, 0.06);
  border-radius: var(--border-radius);
  padding: var(--space-xl) var(--space-xl);
}

.step__header {
  display: flex;
  align-items: center;
  gap: var(--space-md);
  margin-bottom: var(--space-sm);
}

.step__number {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 32px;
  height: 32px;
  border-radius: var(--border-radius-sm);
  background: var(--color-surface);
  color: var(--color-primary);
  font-size: var(--body-size);
  font-weight: 700;
  flex-shrink: 0;
}

.step__title {
  font-size: 16px;
  font-weight: 700;
}

.step__desc {
  font-size: var(--body-size-sm);
  color: var(--color-ink);
  opacity: 0.65;
  line-height: 1.7;
}

/* Response Tiers */
.tiers {
  background: var(--color-white);
  border: 1px solid rgba(0, 0, 0, 0.06);
  border-radius: var(--border-radius);
  padding: var(--space-xl);
}

.tiers__title {
  font-size: var(--tag-size);
  font-weight: var(--tag-weight);
  letter-spacing: var(--tag-spacing);
  text-transform: uppercase;
  color: var(--color-primary);
  margin-bottom: var(--space-lg);
}

.tiers__list {
  display: grid;
  gap: var(--space-sm);
}

.tier {
  display: grid;
  grid-template-columns: 90px 70px 1fr auto;
  align-items: center;
  gap: var(--space-md);
  padding: var(--space-md) var(--space-lg);
  border-radius: var(--border-radius-sm);
  border-left: 4px solid transparent;
}

.tier--low {
  background: rgba(39, 174, 96, 0.15);
  border-left-color: var(--color-accent);
}

.tier--medium {
  background: rgba(217, 119, 6, 0.15);
  border-left-color: var(--color-warning);
}

.tier--high {
  background: rgba(234, 123, 30, 0.18);
  border-left-color: var(--color-high-risk);
}

.tier--critical {
  background: rgba(220, 38, 38, 0.15);
  border-left-color: var(--color-critical);
}

.tier__range {
  font-size: var(--body-size-sm);
  font-weight: 700;
}

.tier--medium .tier__range,
.tier--high .tier__range,
.tier--critical .tier__range {
  color: var(--color-ink);
}

.tier__level {
  font-size: var(--body-size-sm);
  font-weight: 700;
}

.tier__desc {
  font-size: var(--body-size-sm);
  opacity: 0.7;
}

.tier__badge {
  display: inline-block;
  padding: 4px 12px;
  border-radius: var(--border-radius-pill);
  font-size: 11px;
  font-weight: 600;
  white-space: nowrap;
}

.tier__badge--low {
  background: var(--color-surface);
  color: var(--color-accent);
}

.tier__badge--medium {
  background: rgba(217, 119, 6, 0.1);
  color: var(--color-warning);
}

.tier__badge--high {
  background: rgba(234, 123, 30, 0.1);
  color: var(--color-high-risk);
}

.tier__badge--critical {
  background: rgba(220, 38, 38, 0.08);
  color: var(--color-critical);
}

/* ========== Science ========== */
.science {
  background: var(--color-surface);
  padding-bottom: var(--space-2xl);
}

.features {
  display: grid;
  grid-template-columns: 1fr;
  gap: var(--space-lg);
}

.feature {
  background: var(--color-white);
  border: 1px solid rgba(0, 0, 0, 0.06);
  border-radius: var(--border-radius);
  padding: var(--space-xl);
}

.feature__icon {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 44px;
  height: 44px;
  border-radius: 50%;
  background: var(--color-surface);
  color: var(--color-primary);
  margin-bottom: var(--space-md);
}

.feature__title {
  font-size: 16px;
  font-weight: 700;
  margin-bottom: var(--space-sm);
}

.feature__desc {
  font-size: var(--body-size-sm);
  opacity: 0.65;
  line-height: 1.7;
}

/* ========== Differentiators ========== */
.differentiators {
  background: var(--color-bg);
}

.diff-grid {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: var(--space-lg);
}

.diff-card {
  background: var(--color-white);
  border: 1px solid rgba(0, 0, 0, 0.06);
  border-radius: var(--border-radius);
  padding: var(--space-xl);
  border-top: 3px solid var(--color-primary);
}

.diff-card__icon {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 44px;
  height: 44px;
  border-radius: 50%;
  background: var(--color-surface);
  color: var(--color-primary);
  margin-bottom: var(--space-md);
}

.diff-card__title {
  font-size: 16px;
  font-weight: 700;
  color: var(--color-ink);
  margin-bottom: var(--space-sm);
}

.diff-card__desc {
  font-size: var(--body-size-sm);
  color: var(--color-ink);
  opacity: 0.65;
  line-height: 1.7;
}

@media (max-width: 768px) {
  .diff-grid {
    grid-template-columns: 1fr;
  }
}

/* ========== Decision Graph ========== */
.decision-graph {
  background: var(--color-bg);
  padding-top: var(--space-2xl);
}

.graph-toggle {
  display: flex;
  justify-content: center;
  gap: var(--space-sm);
  margin-bottom: var(--space-xl);
  flex-wrap: wrap;
}

.graph-toggle__btn {
  padding: 10px 24px;
  border-radius: var(--border-radius-pill);
  border: 1.5px solid var(--color-border);
  background: var(--color-white);
  font-family: var(--font-family);
  font-size: var(--body-size-sm);
  font-weight: 600;
  color: var(--color-ink);
  cursor: pointer;
  transition: all var(--transition-fast);
}

.graph-toggle__btn--active {
  background: var(--color-primary);
  color: var(--color-white);
  border-color: var(--color-primary);
}

.graph-toggle__btn:hover:not(.graph-toggle__btn--active) {
  border-color: var(--color-primary);
  color: var(--color-primary);
}

/* ========== Walkthrough Panel ========== */
.graph-walkthrough {
  background: var(--color-white);
  border: 1px solid rgba(0, 0, 0, 0.06);
  border-radius: var(--border-radius);
  padding: var(--space-xl);
  margin-bottom: var(--space-lg);
}

.walkthrough__header {
  display: flex;
  align-items: flex-start;
  gap: var(--space-md);
  margin-bottom: var(--space-lg);
  padding-bottom: var(--space-lg);
  border-bottom: 1px solid rgba(0, 0, 0, 0.06);
}

.walkthrough__icon {
  font-size: 28px;
  line-height: 1;
  flex-shrink: 0;
}

.walkthrough__icon:empty {
  display: none;
}

.walkthrough__title {
  font-size: 20px;
  font-weight: 700;
  color: var(--color-ink);
  margin-bottom: 4px;
}

.walkthrough__scenario {
  font-size: var(--body-size);
  color: var(--color-ink);
  opacity: 0.6;
  line-height: 1.6;
}

.walkthrough__body {
  display: grid;
  gap: var(--space-lg);
}

.walkthrough__overview p {
  font-size: var(--body-size);
  line-height: 1.7;
  color: var(--color-ink);
}

.walkthrough__overview strong {
  color: var(--color-primary);
}

.walkthrough__label {
  font-size: var(--tag-size);
  font-weight: var(--tag-weight);
  letter-spacing: var(--tag-spacing);
  text-transform: uppercase;
  color: var(--color-primary);
  margin-bottom: var(--space-md);
}

.walkthrough__phase {
  display: flex;
  gap: var(--space-md);
  margin-bottom: var(--space-md);
}

.walkthrough__phase:last-child {
  margin-bottom: 0;
}

.walkthrough__phase-marker {
  width: 4px;
  border-radius: 2px;
  flex-shrink: 0;
}

.walkthrough__phase-name {
  font-size: var(--body-size);
  font-weight: 700;
  display: block;
  margin-bottom: 2px;
}

.walkthrough__phase-desc {
  font-size: var(--body-size-sm);
  color: var(--color-ink);
  opacity: 0.65;
  line-height: 1.6;
}

.walkthrough__flags {
  display: flex;
  flex-wrap: wrap;
  gap: var(--space-sm);
}

.walkthrough__flag {
  display: inline-block;
  padding: 4px 12px;
  border-radius: var(--border-radius-pill);
  font-size: 12px;
  font-weight: 600;
  background: rgba(220, 38, 38, 0.08);
  color: var(--color-critical);
}

.walkthrough__flag--safe {
  background: rgba(39, 174, 96, 0.1);
  color: var(--color-accent);
}

.walkthrough__no-flags {
  margin-top: 0;
}

.walkthrough__result-card {
  background: var(--color-surface);
  border-radius: var(--border-radius-sm);
  padding: var(--space-lg);
  border-left: 4px solid;
}

.walkthrough__result-header {
  display: flex;
  align-items: center;
  gap: var(--space-md);
  margin-bottom: var(--space-sm);
}

.walkthrough__result-score {
  font-size: 24px;
  font-weight: var(--score-weight);
}

.walkthrough__result-level {
  display: inline-block;
  padding: 3px 10px;
  border-radius: var(--border-radius-pill);
  font-size: 11px;
  font-weight: 700;
  color: white;
  text-transform: uppercase;
  letter-spacing: 0.05em;
}

.walkthrough__result-action {
  font-size: var(--body-size-sm);
  color: var(--color-ink);
  opacity: 0.7;
  line-height: 1.6;
}

.graph-container {
  background: var(--color-white);
  border: 1px solid rgba(0, 0, 0, 0.06);
  border-radius: var(--border-radius);
  padding: var(--space-lg);
  margin-bottom: var(--space-3xl);
  position: relative;
  overflow: visible;
}

/* Fullscreen mode */
.graph-container.fullscreen {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  bottom: 0;
  z-index: 2000;
  border-radius: 0;
  margin: 0;
  padding: var(--space-lg);
  overflow: visible;
}

.graph-container.fullscreen .graph-svg {
  height: calc(100vh - 120px);
}

/* Fullscreen button */
.graph-fullscreen-btn {
  position: absolute;
  top: var(--space-md);
  right: var(--space-md);
  background: var(--color-white);
  border: 1px solid rgba(0, 0, 0, 0.12);
  border-radius: var(--border-radius-sm);
  padding: 6px 10px;
  cursor: pointer;
  display: flex;
  align-items: center;
  gap: 6px;
  font-family: var(--font-family);
  font-size: 12px;
  color: var(--color-ink);
  opacity: 0.7;
  transition: all var(--transition-fast);
  z-index: 5;
}

.graph-fullscreen-btn:hover {
  opacity: 1;
  background: var(--color-surface);
}

.graph-fullscreen-btn svg {
  width: 14px;
  height: 14px;
}

.graph-legend {
  display: flex;
  flex-wrap: wrap;
  gap: var(--space-lg);
  padding-bottom: var(--space-md);
  border-bottom: 1px solid rgba(0, 0, 0, 0.06);
  margin-bottom: var(--space-md);
  font-size: 12px;
}

.graph-legend__section {
  display: flex;
  align-items: center;
  gap: var(--space-md);
  flex-wrap: wrap;
}

.graph-legend__section strong {
  font-size: 11px;
  text-transform: uppercase;
  letter-spacing: 0.05em;
  color: #888;
}

.graph-legend__item {
  display: inline-flex;
  align-items: center;
  gap: 4px;
  color: var(--color-ink);
  opacity: 0.7;
}

.graph-legend__dot {
  width: 10px;
  height: 10px;
  border-radius: 50%;
}

.graph-legend__dot--message { background: var(--color-accent); }
.graph-legend__dot--call { background: var(--color-primary); }
.graph-legend__dot--media { background: var(--color-warning); }
.graph-legend__dot--document { background: var(--color-high-risk); }
.graph-legend__dot--switch { background: var(--color-critical); }

.graph-legend__line {
  display: inline-block;
  width: 20px;
  height: 2px;
}

.graph-legend__line--reply { background: #999; }
.graph-legend__line--pressure { background: var(--color-high-risk); height: 3px; }
.graph-legend__line--contradict { background: var(--color-critical); background: repeating-linear-gradient(90deg, var(--color-critical) 0, var(--color-critical) 4px, transparent 4px, transparent 7px); }
.graph-legend__line--build { background: var(--color-accent); }

.graph-svg {
  width: 100%;
  height: 420px;
  position: relative;
  overflow: auto;
  scrollbar-width: thin;
  scrollbar-color: rgba(0, 0, 0, 0.15) transparent;
}

.graph-svg::-webkit-scrollbar {
  width: 6px;
  height: 6px;
}

.graph-svg::-webkit-scrollbar-track {
  background: transparent;
}

.graph-svg::-webkit-scrollbar-thumb {
  background: rgba(0, 0, 0, 0.15);
  border-radius: 3px;
}

.graph-svg::-webkit-scrollbar-thumb:hover {
  background: rgba(0, 0, 0, 0.3);
}

/* Interact wrapper and overlay */
.graph-interact-wrapper {
  position: relative;
}

.graph-interact-overlay {
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  bottom: 0;
  z-index: 4;
  display: flex;
  align-items: center;
  justify-content: center;
  cursor: pointer;
  background: rgba(250, 252, 251, 0.4);
  transition: all var(--transition-base);
}

.graph-interact-overlay:hover {
  background: rgba(250, 252, 251, 0.6);
}

.graph-interact-overlay.hidden {
  opacity: 0;
  pointer-events: none;
}

.graph-interact-prompt {
  display: flex;
  align-items: center;
  gap: var(--space-sm);
  padding: 10px 20px;
  background: var(--color-white);
  border: 1px solid rgba(0, 0, 0, 0.1);
  border-radius: var(--border-radius-pill);
  box-shadow: var(--shadow-md);
  font-size: var(--body-size-sm);
  font-weight: 600;
  color: var(--color-primary);
  transition: all var(--transition-fast);
}

.graph-interact-overlay:hover .graph-interact-prompt {
  background: var(--color-primary);
  color: var(--color-white);
  border-color: var(--color-primary);
}

.graph-interact-overlay:hover .graph-interact-prompt svg {
  stroke: white;
}

/* When graph is NOT active — disable interaction on the SVG */
.graph-interact-wrapper:not(.active) .graph-svg {
  pointer-events: none;
}

/* When graph is active (investigating) */
.graph-interact-wrapper.active .graph-svg {
  pointer-events: auto;
  outline: 2px solid var(--color-primary);
  outline-offset: -2px;
  border-radius: var(--border-radius-sm);
}

.graph-exit-btn {
  display: none;
  position: absolute;
  top: var(--space-sm);
  left: var(--space-sm);
  z-index: 5;
  padding: 5px 12px;
  background: var(--color-ink);
  color: var(--color-white);
  border: none;
  border-radius: var(--border-radius-pill);
  font-family: var(--font-family);
  font-size: 11px;
  font-weight: 600;
  cursor: pointer;
  opacity: 0.8;
  transition: opacity var(--transition-fast);
}

.graph-exit-btn:hover {
  opacity: 1;
}

.graph-interact-wrapper.active .graph-exit-btn {
  display: block;
}

.graph-svg svg {
  min-width: 100%;
  min-height: 100%;
}

.graph-tooltip {
  position: absolute;
  background: var(--color-ink);
  color: var(--color-white);
  padding: 8px 12px;
  border-radius: var(--border-radius-sm);
  font-size: 12px;
  pointer-events: none;
  opacity: 0;
  transition: opacity var(--transition-fast);
  z-index: 10;
  max-width: 220px;
  line-height: 1.4;
}

.graph-tooltip.visible {
  opacity: 1;
}

/* Node Detail Popup */
#nodePopup {
  position: absolute;
  top: 50%;
  left: 50%;
  transform: translate(-50%, -50%) scale(0.9);
  background: var(--color-white);
  border-radius: var(--border-radius);
  box-shadow: 0 12px 40px rgba(0, 0, 0, 0.18);
  width: 300px;
  max-width: 90%;
  z-index: 20;
  opacity: 0;
  transition: opacity 0.2s ease, transform 0.2s ease;
  overflow: hidden;
}

#nodePopup.visible {
  opacity: 1;
  transform: translate(-50%, -50%) scale(1);
}

.node-popup__header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 12px 16px;
  background: var(--color-bg);
  border-bottom: 1px solid rgba(0, 0, 0, 0.06);
}

.node-popup__type {
  font-size: 12px;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.05em;
}

.node-popup__close {
  background: none;
  border: none;
  font-size: 20px;
  color: #999;
  cursor: pointer;
  line-height: 1;
  padding: 0 2px;
}

.node-popup__close:hover {
  color: var(--color-ink);
}

.node-popup__body {
  padding: 16px;
}

.node-popup__label {
  font-size: 14px;
  color: var(--color-ink);
  line-height: 1.5;
  margin-bottom: 12px;
}

.node-popup__meta {
  display: flex;
  gap: 6px;
  flex-wrap: wrap;
}

.node-popup__badge {
  display: inline-block;
  padding: 3px 8px;
  border-radius: var(--border-radius-pill);
  font-size: 11px;
  font-weight: 600;
}

/* Scoring */
.scoring__title {
  font-size: 18px;
  font-weight: 700;
  text-align: center;
  margin-bottom: var(--space-xl);
}

.scoring__grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
  gap: var(--space-md);
  margin-bottom: var(--space-xl);
}

.scoring__card {
  background: var(--color-surface);
  border-radius: var(--border-radius);
  padding: var(--space-lg);
  text-align: center;
}

.scoring__icon {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 40px;
  height: 40px;
  border-radius: 50%;
  background: var(--color-white);
  color: var(--color-primary);
  margin-bottom: var(--space-sm);
}

.scoring__card h4 {
  font-size: 15px;
  font-weight: 700;
  margin-bottom: var(--space-xs);
  color: var(--color-ink);
}

.scoring__card p {
  font-size: 12px;
  opacity: 0.6;
  line-height: 1.5;
}

.scoring__formula {
  background: var(--color-surface);
  border-radius: var(--border-radius);
  padding: var(--space-xl);
  text-align: center;
}

.scoring__formula-label {
  display: block;
  font-size: var(--tag-size);
  font-weight: var(--tag-weight);
  letter-spacing: var(--tag-spacing);
  text-transform: uppercase;
  color: var(--color-primary);
  margin-bottom: var(--space-sm);
}

.scoring__formula code {
  display: block;
  font-family: 'Courier New', monospace;
  font-size: 14px;
  color: var(--color-ink);
  padding: var(--space-md);
  background: var(--color-white);
  border-radius: var(--border-radius-sm);
  margin-bottom: var(--space-sm);
  overflow-x: auto;
}

.scoring__formula-note {
  font-size: 12px;
  opacity: 0.5;
}

/* ========== Testimonials ========== */
.testimonials {
  background: var(--color-surface);
}

.testimonials__grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: var(--space-lg);
  margin-bottom: var(--space-3xl);
}

.testimonial {
  background: var(--color-white);
  border: 1px solid rgba(0, 0, 0, 0.06);
  border-radius: var(--border-radius);
  padding: var(--space-xl);
}

.testimonial__quote {
  font-size: var(--body-size);
  font-style: italic;
  line-height: 1.7;
  color: var(--color-ink);
  margin-bottom: var(--space-lg);
}

.testimonial__author {
  display: flex;
  align-items: center;
  gap: var(--space-md);
}

.testimonial__avatar {
  display: flex;
  align-items: center;
  justify-content: center;
  width: 40px;
  height: 40px;
  border-radius: 50%;
  background: var(--color-surface);
  color: var(--color-primary);
  font-weight: 700;
  font-size: 13px;
  flex-shrink: 0;
}

.testimonial__name {
  display: block;
  font-size: var(--body-size);
  font-weight: 700;
}

.testimonial__role {
  font-size: 12px;
  color: var(--color-accent);
}

/* MRI Reference */
.mri-ref {
  background: var(--color-white);
  border: 1px solid rgba(0, 0, 0, 0.06);
  border-radius: var(--border-radius);
  padding: var(--space-xl);
}

.mri-ref__title {
  font-size: var(--tag-size);
  font-weight: var(--tag-weight);
  letter-spacing: var(--tag-spacing);
  text-transform: uppercase;
  color: var(--color-primary);
  margin-bottom: var(--space-lg);
}

.mri-ref__bar {
  display: flex;
  height: 12px;
  border-radius: 6px;
  overflow: hidden;
  margin-bottom: var(--space-sm);
}

.mri-ref__segment--low {
  flex: 30;
  background: var(--color-accent);
}

.mri-ref__segment--medium {
  flex: 25;
  background: var(--color-warning);
}

.mri-ref__segment--high {
  flex: 20;
  background: var(--color-high-risk);
}

.mri-ref__segment--critical {
  flex: 25;
  background: var(--color-critical);
}

.mri-ref__labels {
  position: relative;
  height: 24px;
  font-size: 11px;
  color: #888;
  margin-bottom: var(--space-lg);
}

.mri-ref__label {
  position: absolute;
  transform: translateX(-50%);
}

.mri-ref__label--start {
  left: 0;
  transform: none;
}

.mri-ref__label--end {
  right: 0;
  left: auto;
  transform: none;
}

.mri-ref__tiers {
  display: grid;
  gap: var(--space-sm);
}

.mri-ref__tier {
  display: grid;
  grid-template-columns: 90px 70px 1fr;
  gap: var(--space-md);
  padding: var(--space-md) var(--space-lg);
  border-radius: var(--border-radius-sm);
  align-items: center;
  border-left: 4px solid transparent;
}

.mri-ref__tier--low {
  background: rgba(39, 174, 96, 0.15);
  border-left-color: var(--color-accent);
}

.mri-ref__tier--medium {
  background: rgba(217, 119, 6, 0.15);
  border-left-color: var(--color-warning);
}

.mri-ref__tier--high {
  background: rgba(234, 123, 30, 0.18);
  border-left-color: var(--color-high-risk);
}

.mri-ref__tier--critical {
  background: rgba(220, 38, 38, 0.15);
  border-left-color: var(--color-critical);
}

.mri-ref__tier-range {
  font-size: var(--body-size-sm);
  font-weight: 700;
}

.mri-ref__tier-level {
  font-size: var(--body-size-sm);
  font-weight: 700;
}

.mri-ref__tier-desc {
  font-size: var(--body-size-sm);
  opacity: 0.7;
}

/* ========== CTA Banner ========== */
.cta-banner {
  background: var(--color-primary);
  padding: var(--space-4xl) 0;
  text-align: center;
  border-radius: var(--border-radius);
  margin: 0 var(--space-lg);
}

.cta-banner__title {
  font-size: 28px;
  font-weight: 700;
  color: var(--color-white);
  line-height: 1.3;
  margin-bottom: var(--space-md);
}

.cta-banner__subtitle {
  font-size: var(--body-size);
  color: var(--color-white);
  opacity: 0.8;
  margin-bottom: var(--space-xl);
}

.cta-banner__buttons {
  display: flex;
  justify-content: center;
  gap: var(--space-md);
  flex-wrap: wrap;
}

/* ========== Footer ========== */
.footer {
  background: var(--color-ink);
  color: var(--color-white);
  padding: var(--space-3xl) 0 0;
}

.footer__grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: var(--space-xl);
  padding-bottom: var(--space-3xl);
  border-bottom: 1px solid rgba(255, 255, 255, 0.1);
}

.footer__heading {
  font-size: var(--tag-size);
  font-weight: var(--tag-weight);
  letter-spacing: var(--tag-spacing);
  text-transform: uppercase;
  color: var(--color-accent);
  margin-bottom: var(--space-md);
}

.footer__col p {
  font-size: var(--body-size-sm);
  opacity: 0.7;
  line-height: 1.8;
}

.footer__col strong {
  opacity: 1;
  color: var(--color-white);
}

.footer__bottom {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: var(--space-lg) 0;
  flex-wrap: wrap;
  gap: var(--space-md);
}

.footer__logo {
  font-size: 16px;
  font-weight: 700;
}

.footer__links {
  display: flex;
  gap: var(--space-lg);
}

.footer__links a {
  font-size: var(--body-size-sm);
  opacity: 0.6;
  transition: opacity var(--transition-fast);
}

.footer__links a:hover {
  opacity: 1;
}

.footer__copy {
  font-size: 12px;
  opacity: 0.4;
}

/* ========== Signup Modal ========== */
.modal-overlay {
  position: fixed;
  inset: 0;
  z-index: 2000;
  background: rgba(0, 0, 0, 0.5);
  backdrop-filter: blur(4px);
  -webkit-backdrop-filter: blur(4px);
  display: flex;
  align-items: center;
  justify-content: center;
  opacity: 0;
  pointer-events: none;
  transition: opacity var(--transition-base);
}

.modal-overlay.active {
  opacity: 1;
  pointer-events: auto;
}

.modal {
  background: var(--color-white);
  border-radius: var(--border-radius);
  padding: var(--space-2xl);
  max-width: 440px;
  width: 90%;
  position: relative;
  box-shadow: var(--shadow-lg);
  transform: translateY(20px) scale(0.97);
  transition: transform var(--transition-base);
}

.modal-overlay.active .modal {
  transform: translateY(0) scale(1);
}

.modal__close {
  position: absolute;
  top: 16px;
  right: 16px;
  background: none;
  border: none;
  font-size: 24px;
  color: var(--color-ink);
  cursor: pointer;
  opacity: 0.4;
  transition: opacity var(--transition-fast);
  line-height: 1;
}

.modal__close:hover {
  opacity: 1;
}

.modal__header {
  text-align: center;
  margin-bottom: var(--space-xl);
}

.modal__badge {
  display: inline-block;
  padding: 4px 12px;
  border-radius: var(--border-radius-pill);
  background: var(--color-surface);
  color: var(--color-primary);
  font-size: 12px;
  font-weight: 600;
  margin-bottom: var(--space-md);
}

.modal__title {
  font-size: 22px;
  font-weight: 700;
  color: var(--color-ink);
  margin-bottom: var(--space-sm);
}

.modal__subtitle {
  font-size: var(--body-size-sm);
  color: var(--color-ink);
  opacity: 0.6;
  line-height: 1.5;
}

.modal__form {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: var(--space-md);
}

.modal__field label {
  display: block;
  font-size: 12px;
  font-weight: 600;
  color: var(--color-ink);
  margin-bottom: 4px;
}

.modal__field input {
  width: 100%;
  padding: 10px 14px;
  border: 1.5px solid var(--color-border);
  border-radius: var(--border-radius-sm);
  font-family: var(--font-family);
  font-size: var(--body-size);
  color: var(--color-ink);
  background: var(--color-bg);
  transition: border-color var(--transition-fast);
  outline: none;
}

.modal__field input:focus {
  border-color: var(--color-primary);
}

.modal__field input::placeholder {
  color: #aaa;
}

.modal__field--full {
  grid-column: 1 / -1;
}

.modal__submit {
  grid-column: 1 / -1;
  width: 100%;
  margin-top: var(--space-sm);
}

.modal__error {
  display: block;
  font-size: 12px;
  color: var(--color-critical);
  margin-top: 4px;
}

.modal__input--error {
  border-color: var(--color-critical) !important;
  background: rgba(220, 38, 38, 0.04);
}

.modal__success {
  text-align: center;
  padding: var(--space-lg) 0;
}

.modal__success-icon {
  margin-bottom: var(--space-md);
}

.modal__success h3 {
  font-size: 18px;
  font-weight: 700;
  color: var(--color-ink);
  margin-bottom: var(--space-sm);
}

.modal__success p {
  font-size: var(--body-size-sm);
  color: var(--color-ink);
  opacity: 0.6;
}

/* ========== Scroll Animations ========== */
.fade-in {
  opacity: 0;
  transform: translateY(20px);
  transition: opacity 0.6s ease, transform 0.6s ease;
}

.fade-in.visible {
  opacity: 1;
  transform: translateY(0);
}

/* ========== Responsive ========== */
@media (min-width: 768px) {
  .hero__title {
    font-size: 40px;
  }

  .section__title {
    font-size: 32px;
  }

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

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

  .testimonials__grid {
    grid-template-columns: repeat(3, 1fr);
  }

  .cta-banner__title {
    font-size: 36px;
  }
}

@media (max-width: 768px) {
  .nav__links {
    position: fixed;
    top: var(--nav-height);
    right: -100%;
    width: 280px;
    height: calc(100vh - var(--nav-height));
    background: var(--color-white);
    flex-direction: column;
    padding: var(--space-xl);
    box-shadow: var(--shadow-lg);
    transition: right var(--transition-base);
    align-items: flex-start;
  }

  .nav__links.open {
    right: 0;
  }

  .nav__hamburger {
    display: flex;
  }

  .hero__phones {
    flex-direction: row;
    gap: var(--space-md);
  }

  .phone {
    width: 180px;
  }

  .phone--safe {
    transform: rotate(-2deg) translateY(5px);
  }

  .phone--critical {
    transform: rotate(2deg) translateY(-5px);
  }

  .phone__score {
    font-size: 36px;
  }

  .tier {
    grid-template-columns: 80px 60px 1fr auto;
    padding: var(--space-sm) var(--space-md);
    font-size: 12px;
  }

  .mri-ref__tier {
    grid-template-columns: 80px 60px 1fr;
    padding: var(--space-sm) var(--space-md);
  }

  .footer__grid {
    grid-template-columns: 1fr;
    gap: var(--space-xl);
  }

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

  .graph-legend {
    flex-direction: column;
    gap: var(--space-sm);
  }

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

  .graph-svg {
    height: 350px;
  }

  .graph-toggle {
    flex-wrap: wrap;
  }

  .graph-interact-prompt {
    font-size: 12px;
    padding: 8px 16px;
  }

  .cta-banner {
    margin: 0;
    border-radius: 0;
  }
}

@media (max-width: 480px) {
  .hero__title {
    font-size: 26px;
  }

  .hero__ctas {
    flex-direction: column;
    width: 100%;
    max-width: 300px;
  }

  .hero__phones {
    flex-direction: column;
    align-items: center;
    gap: var(--space-lg);
  }

  .phone--safe,
  .phone--critical {
    transform: none;
  }

  .phone {
    width: 220px;
  }

  .tier {
    grid-template-columns: 1fr;
    gap: var(--space-xs);
  }

  .tier__badge {
    justify-self: start;
  }

  .mri-ref__tier {
    grid-template-columns: 1fr;
    gap: var(--space-xs);
  }

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

  .graph-toggle {
    flex-direction: column;
    align-items: center;
  }

  .graph-svg {
    height: 300px;
  }

  .graph-container {
    padding: var(--space-md);
  }

  .graph-legend {
    font-size: 10px;
    gap: var(--space-xs);
  }

  .graph-legend__section {
    gap: var(--space-sm);
  }

  .cta-banner__buttons {
    flex-direction: column;
    align-items: center;
  }
}