/* ==========================================================================
   Main Stylesheet — ColorBase Cortex
   ==========================================================================
   Imports design tokens, component library, and defines all section-specific
   styles for the single-page marketing site.
   ========================================================================== */

@import url('https://fonts.googleapis.com/css2?family=Inter:wght@400;500;600;700&family=Source+Sans+3:wght@400;600;700&family=JetBrains+Mono:wght@400;500&display=swap');
@import url('./tokens.css');
@import url('./components.css');


/* ==========================================================================
   Global Reset & Base
   ========================================================================== */

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

html {
  scroll-behavior: smooth;
  scroll-padding-top: 80px;
  -webkit-text-size-adjust: 100%;
}

body {
  font-family: var(--font-body);
  font-size: var(--text-body);
  font-weight: var(--fw-regular);
  line-height: var(--lh-body);
  color: var(--color-text-primary);
  background-color: var(--color-white);
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
  overflow-x: hidden;
}

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

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

a:focus-visible,
button:focus-visible,
input:focus-visible,
textarea:focus-visible,
select:focus-visible {
  outline: 2px solid var(--color-primary);
  outline-offset: 2px;
}

h1, h2, h3, h4, h5, h6 {
  font-family: var(--font-display);
  font-weight: var(--fw-bold);
  line-height: var(--lh-heading);
  color: var(--color-text-primary);
}

ul, ol {
  list-style: none;
}

button {
  font-family: inherit;
  font-size: inherit;
  cursor: pointer;
  border: none;
  background: none;
}

input, textarea, select {
  font-family: inherit;
  font-size: inherit;
}


/* ==========================================================================
   Skip-to-Content Link (Accessibility)
   ========================================================================== */

.skip-to-content {
  position: fixed;
  top: -100%;
  left: var(--space-md);
  z-index: 10000;
  padding: var(--space-sm) var(--space-md);
  background-color: var(--color-primary);
  color: var(--color-white);
  font-weight: var(--fw-semibold);
  border-radius: var(--radius-sm);
  transition: top var(--transition-fast);
}

.skip-to-content:focus {
  top: var(--space-md);
}


/* ==========================================================================
   Section Containers
   ========================================================================== */

.section {
  padding: var(--space-section) var(--grid-gutter);
}

.section-alt {
  padding: var(--space-section) var(--grid-gutter);
  background-color: var(--color-light-fill);
}

.container {
  width: 100%;
  max-width: var(--grid-max-width);
  margin-left: auto;
  margin-right: auto;
  padding-left: var(--grid-gutter);
  padding-right: var(--grid-gutter);
}

.section-header {
  text-align: center;
  max-width: 720px;
  margin-left: auto;
  margin-right: auto;
  margin-bottom: var(--space-3xl);
}

.section-header h2 {
  font-size: var(--text-h1);
  margin-bottom: var(--space-md);
}

.section-header p {
  font-size: 1.125rem;
  color: var(--color-text-secondary);
  line-height: var(--lh-body);
}

.section-label {
  display: inline-block;
  font-family: var(--font-mono);
  font-size: var(--text-caption);
  font-weight: var(--fw-medium);
  letter-spacing: 0.08em;
  text-transform: uppercase;
  color: var(--color-primary);
  margin-bottom: var(--space-sm);
}


/* ==========================================================================
   Navigation (#navbar)
   ========================================================================== */

#navbar {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  z-index: 900;
  height: 72px;
  background-color: var(--color-white);
  transition: box-shadow var(--transition-base);
}

#navbar.scrolled {
  box-shadow: 0 1px 12px rgba(0, 0, 0, 0.08);
}

.nav-inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: 100%;
  max-width: var(--grid-max-width);
  margin: 0 auto;
  padding: 0 var(--grid-gutter);
}

.nav-logo img {
  height: 140px;
  width: auto;
}

.nav-links {
  display: flex;
  align-items: center;
  gap: var(--space-xl);
}

.nav-links a {
  font-size: 0.9375rem;
  font-weight: var(--fw-medium);
  color: var(--color-dark);
  position: relative;
  padding-bottom: 4px;
  transition: color var(--transition-fast);
}

.nav-links a:hover,
.nav-links a:focus {
  color: var(--color-primary);
}

.nav-links a.active {
  color: var(--color-primary);
}

.nav-links a.active::after {
  content: "";
  position: absolute;
  bottom: -2px;
  left: 0;
  right: 0;
  height: 2px;
  background-color: var(--color-primary);
  border-radius: var(--radius-pill);
}

.nav-cta {
  display: inline-flex;
  align-items: center;
  padding: 8px 20px;
  font-size: 0.875rem;
  font-weight: var(--fw-semibold);
  color: var(--color-white);
  background-color: var(--color-primary);
  border-radius: var(--radius-pill);
  transition: background-color var(--transition-fast);
}

.nav-cta:hover,
.nav-cta:focus {
  background-color: var(--color-hover);
  color: var(--color-white);
}

.nav-share {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 36px;
  height: 36px;
  border: none;
  background: transparent;
  cursor: pointer;
  border-radius: var(--radius-sm);
  color: var(--color-text-secondary);
  transition: color var(--transition-fast), background-color var(--transition-fast);
}

.nav-share:hover {
  color: var(--color-primary);
  background-color: var(--color-light-fill);
}

.nav-share svg {
  width: 20px;
  height: 20px;
}

/* Hamburger (mobile) */

.hamburger {
  display: none;
  flex-direction: column;
  justify-content: center;
  gap: 5px;
  width: 36px;
  height: 36px;
  cursor: pointer;
  background: none;
  border: none;
  padding: 6px;
}

.hamburger span {
  display: block;
  width: 100%;
  height: 2px;
  background-color: var(--color-dark);
  border-radius: 2px;
  transition: transform var(--transition-base), opacity var(--transition-fast);
}

.hamburger.open span:nth-child(1) {
  transform: translateY(7px) rotate(45deg);
}

.hamburger.open span:nth-child(2) {
  opacity: 0;
}

.hamburger.open span:nth-child(3) {
  transform: translateY(-7px) rotate(-45deg);
}

/* Mobile menu drawer */

.mobile-menu {
  display: none;
  position: fixed;
  top: 72px;
  left: 0;
  right: 0;
  background-color: var(--color-white);
  box-shadow: 0 8px 24px rgba(0, 0, 0, 0.1);
  padding: var(--space-lg) var(--grid-gutter);
  transform: translateY(-20px);
  opacity: 0;
  transition: transform var(--transition-slow), opacity var(--transition-base);
  z-index: 899;
}

.mobile-menu.active {
  display: flex;
  flex-direction: column;
  transform: translateY(0);
  opacity: 1;
}

.mobile-menu a {
  display: block;
  padding: var(--space-sm) 0;
  font-size: 1.125rem;
  font-weight: var(--fw-medium);
  color: var(--color-dark);
  border-bottom: 1px solid var(--color-border);
}

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

.mobile-menu a:hover,
.mobile-menu a:focus {
  color: var(--color-primary);
}

.mobile-menu .nav-cta {
  display: block;
  text-align: center;
  margin-top: var(--space-lg);
  padding: 12px 24px;
  font-size: 1rem;
}


/* ==========================================================================
   S1 — Hero (#hero)
   ========================================================================== */

#hero {
  position: relative;
  min-height: 100vh;
  display: flex;
  align-items: center;
  overflow: hidden;
  background: linear-gradient(135deg, #0f172a 0%, #4338ca 50%, #22d3ee 100%);
}

.hero-content {
  position: relative;
  z-index: 1;
  display: flex;
  align-items: center;
  gap: var(--space-2xl);
  color: var(--color-text-inverse);
  padding: var(--space-section) var(--grid-gutter);
  margin-left: auto;
  margin-right: auto;
  width: 100%;
  max-width: var(--grid-max-width);
  padding-left: var(--grid-gutter);
  padding-right: var(--grid-gutter);
}

.hero-text {
  flex: 1 1 55%;
  min-width: 0;
}

.hero-eye {
  flex: 0 0 auto;
  width: 510px;
  height: 510px;
  border-radius: 50%;
  overflow: hidden;
  box-shadow: 0 0 60px rgba(0, 180, 216, 0.3), 0 0 120px rgba(67, 56, 202, 0.2);
}

.hero-eye img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  display: block;
}

.hero-content h1 {
  font-family: var(--font-display);
  font-size: clamp(var(--text-display-min), 5vw, var(--text-display-max));
  font-weight: var(--fw-bold);
  line-height: var(--lh-display);
  color: var(--color-text-inverse);
  margin-bottom: var(--space-lg);
}

.hero-sub {
  font-size: 1.125rem;
  color: #A8D4F0;
  line-height: var(--lh-body);
  margin-bottom: var(--space-xl);
  max-width: 540px;
}

.hero-ctas {
  display: flex;
  flex-wrap: wrap;
  gap: var(--space-md);
}

.scroll-indicator {
  position: absolute;
  bottom: 40px;
  left: 50%;
  transform: translateX(-50%);
  z-index: 2;
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: var(--space-xs);
  color: rgba(255, 255, 255, 0.6);
  font-size: var(--text-caption);
  font-weight: var(--fw-medium);
  letter-spacing: 0.05em;
}

.scroll-indicator svg {
  width: 24px;
  height: 24px;
  animation: bounce 2s ease-in-out infinite;
}


/* ==========================================================================
   S2 — The Problem (#problem)
   ========================================================================== */

#problem {
  /* inherits .section styles from markup */
}

.problem-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: var(--space-xl);
}

.problem-card {
  background-color: var(--color-white);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-card);
  padding: var(--space-xl);
  transition: box-shadow var(--transition-base), transform var(--transition-base);
}

.problem-card:hover {
  box-shadow: var(--shadow-raised);
  transform: translateY(-2px);
}

.problem-card .card-icon {
  width: 48px;
  height: 48px;
  margin-bottom: var(--space-lg);
  color: var(--color-primary);
}

.problem-card .card-icon svg {
  width: 100%;
  height: 100%;
}

.problem-card h3 {
  font-size: var(--text-h3);
  margin-bottom: var(--space-sm);
}

.problem-card p {
  color: var(--color-text-secondary);
  font-size: 0.9375rem;
  line-height: var(--lh-body);
}


/* ==========================================================================
   S3 — Cortex Overview (#overview)
   ========================================================================== */

#overview {
  /* inherits .section-alt styles from markup */
}

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

.overview-claim h2 {
  font-size: var(--text-h1);
  margin-bottom: var(--space-md);
}

.overview-claim .delta-e-value {
  font-family: var(--font-mono);
  font-size: var(--text-display-min);
  font-weight: var(--fw-bold);
  color: var(--color-primary);
}

.cascade-diagram {
  display: block;
  max-width: 800px;
  margin: 0 auto var(--space-3xl);
}

.metric-strip {
  display: flex;
  justify-content: center;
  gap: var(--space-3xl);
  flex-wrap: wrap;
}

.metric-strip .metric-item {
  text-align: center;
}

.metric-strip .metric-value {
  font-family: var(--font-display);
  font-size: var(--text-h1);
  font-weight: var(--fw-bold);
  color: var(--color-primary);
  line-height: 1;
  margin-bottom: var(--space-xs);
}

.metric-strip .metric-label {
  font-size: var(--text-caption);
  color: var(--color-text-secondary);
  text-transform: uppercase;
  letter-spacing: 0.06em;
  font-weight: var(--fw-medium);
}


/* ==========================================================================
   S4 — How It Works (#how-it-works)
   ========================================================================== */

#how-it-works {
  /* inherits .section styles from markup */
}

.how-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: var(--space-3xl);
}

.how-column h3 {
  font-size: var(--text-h2);
  margin-bottom: var(--space-xl);
}

/* Override stepper in How It Works to be vertical inside cards */
.onboarding-track .stepper {
  flex-direction: column;
  align-items: stretch;
  gap: var(--space-lg);
}

.onboarding-track .step {
  flex-direction: row;
  align-items: flex-start;
  text-align: left;
  gap: var(--space-md);
}

.onboarding-track .step::before {
  margin-bottom: 0;
  flex-shrink: 0;
}

.onboarding-track .step:not(:last-child)::after {
  display: none;
}

.onboarding-track .step .step-content h4 {
  font-size: 1rem;
  font-weight: var(--fw-semibold);
  margin-bottom: var(--space-xs);
}

.onboarding-track .step .step-content p {
  color: var(--color-text-secondary);
  font-size: 0.9375rem;
  line-height: var(--lh-body);
}

.onboarding-title {
  display: flex;
  align-items: center;
  gap: var(--space-sm);
  font-size: var(--text-h3);
  margin-bottom: var(--space-lg);
  color: var(--color-primary);
}


/* ==========================================================================
   S5 — Accuracy (#accuracy)
   ========================================================================== */

#accuracy {
  /* inherits .section-alt styles from markup */
}

/* --- ΔE Scale with Magnifier ----------------------------------------- */

.de-scale {
  max-width: 960px;
  margin: var(--space-2xl) auto 0;
  padding: 0 var(--space-xl);
}

/* ---- Main scale (30+ → 0) ---- */

.de-main-labels {
  position: relative;
  height: 56px;
  margin-bottom: 6px;
}

.de-ml {
  position: absolute;
  left: var(--pos);
  bottom: 0;
  transform: translateX(-50%);
  text-align: center;
}

.de-ml:first-child {
  transform: translateX(0);
  text-align: left;
}

.de-ml-val {
  display: block;
  font-family: var(--font-mono);
  font-weight: var(--fw-bold);
  font-size: 0.8125rem;
  color: var(--color-text-secondary);
}

.de-ml-txt {
  display: block;
  font-size: 0.6875rem;
  line-height: 1.3;
  color: var(--color-text-tertiary);
  font-style: italic;
}

/* Main gradient track */
.de-main-track {
  position: relative;
  height: 16px;
  background: linear-gradient(90deg, #dc2626 0%, #ef4444 15%, #f97316 30%, #eab308 50%, #84cc16 70%, #22c55e 84%, #0066CC 92%, #0044aa 100%);
  border-radius: var(--radius-pill);
}

.de-main-tick {
  position: absolute;
  left: var(--pos);
  top: -3px;
  width: 2px;
  height: 22px;
  background: rgba(255, 255, 255, 0.45);
  transform: translateX(-50%);
}

/* Danger line at ΔE 2.0 */
.de-danger-line {
  position: absolute;
  left: var(--pos);
  top: -10px;
  bottom: -10px;
  width: 3px;
  background: #dc2626;
  transform: translateX(-50%);
  z-index: 1;
}

.de-danger-label {
  position: absolute;
  top: -22px;
  left: 50%;
  transform: translateX(-50%);
  font-family: var(--font-mono);
  font-size: 0.6875rem;
  font-weight: var(--fw-bold);
  color: #dc2626;
  white-space: nowrap;
  background: var(--color-fill-light);
  padding: 1px 6px;
  border-radius: 3px;
  border: 1px solid #fca5a5;
}

/* Tiny Cortex sliver on main scale */
.de-main-cortex-zone {
  position: absolute;
  right: 0;
  left: 84%;
  top: 0;
  bottom: 0;
  border-radius: 0 var(--radius-pill) var(--radius-pill) 0;
  background: rgba(255, 255, 255, 0.12);
  border: 2px solid rgba(255, 255, 255, 0.35);
  border-left: none;
}

/* Labels below the main track */
.de-main-bottom {
  display: flex;
  justify-content: space-between;
  align-items: center;
  margin-top: 8px;
  padding: 0 2px;
}

.de-zone-bad {
  font-size: 0.75rem;
  font-weight: var(--fw-semibold);
  color: #dc2626;
}

.de-zone-good {
  font-size: 0.75rem;
  font-weight: var(--fw-semibold);
  color: var(--color-primary);
}

/* ---- Magnifying glass connector ---- */
.de-magnifier-connector {
  position: relative;
  width: 100%;
  height: 120px;
  margin-top: -50px;
  pointer-events: none;
}

.de-mag-svg {
  width: 100%;
  height: 100%;
  display: block;
  overflow: visible;
}

/* ---- Magnifier box ---- */
.de-zoom-box {
  background: var(--color-fill-light);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-lg);
  padding: var(--space-lg) var(--space-xl) var(--space-md);
  margin-top: var(--space-sm);
}

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

.de-zoom-title {
  font-family: var(--font-display);
  font-size: 0.9375rem;
  font-weight: var(--fw-semibold);
  color: var(--color-text-primary);
}

/* Zoom track (ΔE 2.0 → 0) */
.de-zoom-track {
  position: relative;
  height: 20px;
  background: linear-gradient(90deg, #22c55e 0%, #0066CC 40%, #0052b3 70%, #003d99 100%);
  border-radius: var(--radius-pill);
  margin-bottom: 56px;
}

/* Zoom tick marks + labels */
.de-zt {
  position: absolute;
  left: var(--pos);
  top: 0;
  transform: translateX(-50%);
  display: flex;
  flex-direction: column;
  align-items: center;
}

.de-zt:first-child {
  transform: translateX(0);
  align-items: flex-start;
}

.de-zt:last-child {
  transform: translateX(-100%);
  align-items: flex-end;
}

.de-zt-tick {
  width: 2px;
  height: 32px;
  background: rgba(255, 255, 255, 0.4);
  margin-top: -6px;
}

.de-zt-val {
  display: block;
  font-family: var(--font-mono);
  font-weight: var(--fw-bold);
  font-size: 0.9375rem;
  color: var(--color-text-secondary);
  margin-top: 4px;
}

.de-zt-lbl {
  display: block;
  font-size: 0.6875rem;
  color: var(--color-text-tertiary);
  margin-top: 1px;
}

/* Cortex markers in zoom */
.de-zt-cortex .de-zt-tick {
  width: 3px;
  height: 36px;
  margin-top: -8px;
  background: rgba(255, 255, 255, 0.7);
}

.de-zt-cortex .de-zt-val {
  color: var(--color-primary);
  font-size: 1.0625rem;
}

.de-zt-cortex .de-zt-lbl {
  color: var(--color-primary);
  font-weight: var(--fw-semibold);
  font-size: 0.75rem;
}

/* Best marker (UV) */
.de-zt-best .de-zt-tick {
  width: 4px;
  height: 40px;
  margin-top: -10px;
  background: white;
  box-shadow: 0 0 10px rgba(0, 180, 216, 0.5);
}

.de-zt-best .de-zt-val {
  color: var(--color-accent);
  font-size: 1.1875rem;
  font-weight: var(--fw-bold);
}

.de-zt-best .de-zt-lbl {
  color: var(--color-accent);
  font-weight: var(--fw-bold);
  font-size: 0.8125rem;
}

.de-zt-zero .de-zt-val {
  color: var(--color-text-tertiary);
}

.de-zt-zero .de-zt-lbl {
  color: var(--color-text-tertiary);
}


.accuracy-note {
  text-align: center;
  margin-top: var(--space-2xl);
  font-size: var(--text-caption);
  color: var(--color-text-secondary);
  max-width: 600px;
  margin-left: auto;
  margin-right: auto;
}


/* ==========================================================================
   S6 — ColorBase 5 Database (#database)
   ========================================================================== */

#database {
  /* inherits .section styles from markup */
}

.database-metrics {
  display: flex;
  justify-content: center;
  gap: var(--space-3xl);
  flex-wrap: wrap;
  margin-bottom: var(--space-2xl);
}

.database-metric {
  text-align: center;
}

.database-metric .metric-number {
  font-family: var(--font-display);
  font-size: clamp(2.5rem, 5vw, var(--text-display-max));
  font-weight: var(--fw-bold);
  color: var(--color-primary);
  line-height: 1.1;
  margin-bottom: var(--space-xs);
}

.database-metric .metric-desc {
  font-size: 1rem;
  color: var(--color-text-secondary);
  font-weight: var(--fw-medium);
}

.database-text {
  text-align: center;
  max-width: 640px;
  margin: 0 auto;
  color: var(--color-text-secondary);
  font-size: 1rem;
  line-height: var(--lh-body);
}


/* ==========================================================================
   S7 — Audiences / Personas (#audiences)
   ========================================================================== */

#audiences {
  /* inherits .section-alt styles from markup */
}

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

.persona-card {
  background-color: var(--color-white);
  border: 1px solid var(--color-border);
  border-left: 4px solid var(--color-primary);
  border-radius: var(--radius-card);
  padding: var(--space-xl);
  box-shadow: var(--shadow-card);
  transition: box-shadow var(--transition-base), transform var(--transition-base);
}

.persona-card:hover {
  box-shadow: var(--shadow-raised);
  transform: translateY(-2px);
}

.persona-card:nth-child(2) {
  border-left-color: var(--color-accent);
}

.persona-card:nth-child(3) {
  border-left-color: var(--color-success);
}

.persona-card:nth-child(4) {
  border-left-color: var(--color-mid-blue);
}

.persona-card .persona-icon {
  width: 40px;
  height: 40px;
  margin-bottom: var(--space-md);
  color: var(--color-primary);
}

.persona-card .persona-icon svg {
  width: 100%;
  height: 100%;
}

.persona-card h3 {
  font-size: var(--text-h3);
  margin-bottom: var(--space-sm);
}

.persona-card .persona-pain {
  color: var(--color-text-secondary);
  font-size: 0.9375rem;
  line-height: var(--lh-body);
  margin-bottom: var(--space-md);
}

.persona-card .persona-expand {
  font-size: 0.875rem;
  font-weight: var(--fw-semibold);
  color: var(--color-primary);
  cursor: pointer;
  background: none;
  border: none;
  padding: 0;
  display: inline-flex;
  align-items: center;
  gap: var(--space-xs);
  transition: color var(--transition-fast);
}

.persona-card .persona-expand:hover {
  color: var(--color-hover);
}

.persona-card .persona-expand svg {
  width: 16px;
  height: 16px;
  transition: transform var(--transition-fast);
}

.persona-card .persona-expand.open svg {
  transform: rotate(180deg);
}

.persona-card .persona-detail {
  max-height: 0;
  overflow: hidden;
  transition: max-height 0.4s ease;
}

.persona-card.expanded .persona-detail {
  max-height: 300px;
}

.persona-card .persona-detail p {
  padding-top: var(--space-md);
  font-size: 0.9375rem;
  color: var(--color-text-secondary);
  line-height: var(--lh-body);
}

.persona-toggle {
  cursor: pointer;
  color: var(--color-primary);
  font-weight: var(--fw-semibold);
  font-size: 0.9375rem;
  background: none;
  border: none;
  padding: 0;
  display: inline-flex;
  align-items: center;
  gap: var(--space-xs);
  margin-top: var(--space-sm);
}

.persona-toggle:hover {
  color: var(--color-hover);
}

.toggle-icon {
  transition: transform 0.3s ease;
  font-size: 1.2em;
}

.persona-card.expanded .toggle-icon {
  transform: rotate(45deg);
}


/* ==========================================================================
   S8 — API & Building Blocks (#api)
   ========================================================================== */

#api {
  /* inherits .section styles from markup */
}

.pipeline-diagram {
  display: block;
  max-width: 800px;
  margin: 0 auto var(--space-3xl);
}

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

.block-card {
  background-color: var(--color-light-fill);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-card);
  padding: var(--space-lg);
  text-align: center;
  transition: box-shadow var(--transition-base), transform var(--transition-base);
}

.block-card:hover {
  box-shadow: var(--shadow-card);
  transform: translateY(-2px);
}

.block-card .block-icon {
  width: 40px;
  height: 40px;
  margin: 0 auto var(--space-sm);
  color: var(--color-primary);
}

.block-card .block-icon svg {
  width: 100%;
  height: 100%;
}

.block-card h4 {
  font-size: 0.9375rem;
  font-weight: var(--fw-semibold);
  margin-bottom: var(--space-xs);
}

.block-card p {
  font-size: var(--text-caption);
  color: var(--color-text-secondary);
}

.code-section {
  margin-top: var(--space-3xl);
}

.code-section h3 {
  margin-bottom: var(--space-xl);
}

.code-block {
  background-color: var(--color-dark);
  border-radius: var(--radius-lg);
  padding: var(--space-xl);
  overflow-x: auto;
  max-width: 720px;
  margin: 0 auto;
}

.code-endpoint {
  margin-top: var(--space-xl);
  text-align: center;
  font-size: var(--text-caption);
  color: var(--color-text-secondary);
  max-width: 720px;
  margin-left: auto;
  margin-right: auto;
}

.code-block pre {
  margin: 0;
  font-family: var(--font-mono);
  font-size: 0.875rem;
  line-height: 1.6;
  color: #E0E6ED;
}

.code-block .code-comment {
  color: #5A6272;
}

.code-block .code-keyword {
  color: var(--color-accent);
}

.code-block .code-string {
  color: #A8D4F0;
}

.code-block .code-number {
  color: var(--color-success);
}


/* ==========================================================================
   S9 — Output Formats (#outputs)
   ========================================================================== */

#outputs {
  /* inherits .section-alt styles from markup */
}

.format-grid {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: var(--space-lg);
}

.format-item {
  display: flex;
  flex-direction: column;
  align-items: center;
  text-align: center;
  padding: var(--space-lg);
  background-color: var(--color-white);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-card);
  transition: box-shadow var(--transition-base);
}

.format-item:hover {
  box-shadow: var(--shadow-card);
}

.format-item .format-icon {
  width: 48px;
  height: 48px;
  margin-bottom: var(--space-md);
  color: var(--color-primary);
}

.format-item .format-icon svg {
  width: 100%;
  height: 100%;
}

.format-item h4 {
  font-size: 0.9375rem;
  font-weight: var(--fw-semibold);
  margin-bottom: var(--space-xs);
}

.format-item p {
  font-size: var(--text-caption);
  color: var(--color-text-secondary);
  line-height: var(--lh-caption);
}


/* ==========================================================================
   S10 — Contact (#contact)
   ========================================================================== */

#contact {
  background-color: var(--color-dark);
  color: var(--color-text-inverse);
  padding: var(--space-section) var(--grid-gutter);
}

.contact-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: var(--space-3xl);
  max-width: var(--grid-max-width);
  margin: 0 auto;
}

.contact-info h2 {
  font-size: var(--text-h1);
  color: var(--color-text-inverse);
  margin-bottom: var(--space-md);
}

.contact-info p {
  color: #A8BDD4;
  font-size: 1.0625rem;
  line-height: var(--lh-body);
  margin-bottom: var(--space-xl);
}

.contact-info a {
  color: var(--color-accent);
  transition: color var(--transition-fast);
}

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

.contact-form {
  display: flex;
  flex-direction: column;
  gap: var(--space-lg);
}

.contact-form label {
  display: block;
  font-size: var(--text-caption);
  font-weight: var(--fw-medium);
  color: #A8BDD4;
  margin-bottom: var(--space-xs);
  text-transform: uppercase;
  letter-spacing: 0.04em;
}

.contact-form input,
.contact-form textarea {
  width: 100%;
  padding: 12px 16px;
  background-color: rgba(255, 255, 255, 0.08);
  border: 1px solid rgba(255, 255, 255, 0.15);
  border-radius: var(--radius-sm);
  color: var(--color-text-inverse);
  font-size: 1rem;
  transition: border-color var(--transition-fast), background-color var(--transition-fast);
}

.contact-form input::placeholder,
.contact-form textarea::placeholder {
  color: rgba(255, 255, 255, 0.35);
}

.contact-form input:focus,
.contact-form textarea:focus {
  outline: none;
  border-color: var(--color-accent);
  background-color: rgba(255, 255, 255, 0.12);
}

.contact-form textarea {
  resize: vertical;
  min-height: 120px;
}

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

.contact-form .form-submit {
  align-self: flex-start;
}

.contact-form .form-message {
  font-size: 0.875rem;
  padding: var(--space-sm) var(--space-md);
  border-radius: var(--radius-sm);
  display: none;
}

.contact-form .form-message.success {
  display: block;
  background-color: rgba(39, 174, 96, 0.15);
  color: var(--color-success);
  border: 1px solid rgba(39, 174, 96, 0.3);
}

.contact-form .form-message.error {
  display: block;
  background-color: rgba(220, 53, 69, 0.15);
  color: #FF6B6B;
  border: 1px solid rgba(220, 53, 69, 0.3);
}


/* ==========================================================================
   S11 — Footer (#footer)
   ========================================================================== */

#footer {
  background-color: #0A1420;
  color: #A8BDD4;
  padding: var(--space-2xl) var(--grid-gutter);
}

.footer-inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  max-width: var(--grid-max-width);
  margin: 0 auto;
  gap: var(--space-xl);
}

.footer-logo img {
  height: 28px;
  width: auto;
  opacity: 0.7;
  transition: opacity var(--transition-fast);
}

.footer-logo img:hover {
  opacity: 1;
}

.footer-links {
  display: flex;
  align-items: center;
  gap: var(--space-lg);
}

.footer-links a {
  font-size: var(--text-caption);
  font-weight: var(--fw-medium);
  color: #A8BDD4;
  transition: color var(--transition-fast);
}

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

.footer-right {
  display: flex;
  align-items: center;
  gap: var(--space-lg);
}

.footer-social {
  display: flex;
  gap: var(--space-md);
}

.footer-social a {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 32px;
  height: 32px;
  color: #A8BDD4;
  border-radius: var(--radius-sm);
  transition: color var(--transition-fast), background-color var(--transition-fast);
}

.footer-social a:hover {
  color: var(--color-white);
  background-color: rgba(255, 255, 255, 0.08);
}

.footer-social a svg {
  width: 18px;
  height: 18px;
}

.footer-legal {
  font-size: var(--text-caption);
  color: #5A6272;
}


/* ==========================================================================
   Modal Overlay
   ========================================================================== */

.modal-overlay {
  position: fixed;
  inset: 0;
  z-index: 1000;
  background-color: rgba(0, 0, 0, 0.6);
  display: flex;
  align-items: center;
  justify-content: center;
  padding: var(--space-lg);
  opacity: 0;
  visibility: hidden;
  transition: opacity var(--transition-base), visibility var(--transition-base);
}

.modal-overlay.active {
  opacity: 1;
  visibility: visible;
}

.modal {
  position: relative;
  background-color: var(--color-white);
  max-width: 560px;
  width: 100%;
  border-radius: var(--radius-lg);
  padding: 40px;
  box-shadow: 0 16px 48px rgba(0, 0, 0, 0.2);
  transform: scale(0.95);
  transition: transform var(--transition-base);
  max-height: 90vh;
  overflow-y: auto;
}

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

.modal-overlay .modal {
  display: none;
}

.modal-overlay .modal.active {
  display: block;
}

.modal-close {
  position: absolute;
  top: 16px;
  right: 16px;
  width: 36px;
  height: 36px;
  display: flex;
  align-items: center;
  justify-content: center;
  background: none;
  border: none;
  cursor: pointer;
  color: var(--color-text-secondary);
  border-radius: var(--radius-sm);
  transition: color var(--transition-fast), background-color var(--transition-fast);
}

.modal-close:hover {
  color: var(--color-text-primary);
  background-color: var(--color-light-fill);
}

.modal-close svg {
  width: 20px;
  height: 20px;
}

.modal h2 {
  font-size: var(--text-h2);
  margin-bottom: var(--space-sm);
}

.modal .modal-desc {
  color: var(--color-text-secondary);
  margin-bottom: var(--space-xl);
  font-size: 0.9375rem;
}

.modal form {
  display: flex;
  flex-direction: column;
  gap: var(--space-md);
}

.modal form label {
  display: block;
  font-size: var(--text-caption);
  font-weight: var(--fw-medium);
  color: var(--color-text-secondary);
  margin-bottom: var(--space-xs);
}

.modal form input,
.modal form textarea,
.modal form select {
  width: 100%;
  padding: 10px 14px;
  border: 1px solid var(--color-border);
  border-radius: var(--radius-sm);
  font-size: 1rem;
  color: var(--color-text-primary);
  background-color: var(--color-white);
  transition: border-color var(--transition-fast);
}

.modal form input:focus,
.modal form textarea:focus,
.modal form select:focus {
  outline: none;
  border-color: var(--color-primary);
  box-shadow: 0 0 0 3px var(--color-focus-ring);
}

.modal form textarea {
  resize: vertical;
  min-height: 100px;
}

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


/* ==========================================================================
   Cookie Banner (#cookie-banner)
   ========================================================================== */

#cookie-banner {
  position: fixed;
  bottom: 0;
  left: 0;
  right: 0;
  z-index: 950;
  background-color: var(--color-white);
  box-shadow: 0 -2px 16px rgba(0, 0, 0, 0.1);
  padding: var(--space-lg) var(--grid-gutter);
  transform: translateY(100%);
  transition: transform var(--transition-slow);
}

#cookie-banner.visible {
  transform: translateY(0);
}

.cookie-inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: var(--space-xl);
  max-width: var(--grid-max-width);
  margin: 0 auto;
}

.cookie-inner p {
  font-size: 0.875rem;
  color: var(--color-text-secondary);
  line-height: var(--lh-body);
}

.cookie-inner a {
  color: var(--color-primary);
  text-decoration: underline;
}

.cookie-dismiss {
  flex-shrink: 0;
  padding: 8px 20px;
  font-size: 0.875rem;
  font-weight: var(--fw-semibold);
  color: var(--color-white);
  background-color: var(--color-primary);
  border: none;
  border-radius: var(--radius-pill);
  cursor: pointer;
  transition: background-color var(--transition-fast);
}

.cookie-dismiss:hover {
  background-color: var(--color-hover);
}


/* ==========================================================================
   Scroll-Reveal & Animations
   ========================================================================== */

@keyframes bounce {
  0%, 20%, 50%, 80%, 100% {
    transform: translateY(0);
  }
  40% {
    transform: translateY(-8px);
  }
  60% {
    transform: translateY(-4px);
  }
}

@keyframes fadeInUp {
  from {
    opacity: 0;
    transform: translateY(24px);
  }
  to {
    opacity: 1;
    transform: translateY(0);
  }
}

@keyframes fadeIn {
  from {
    opacity: 0;
  }
  to {
    opacity: 1;
  }
}

.reveal {
  opacity: 0;
  transform: translateY(24px);
  transition: opacity 0.6s ease-out, transform 0.6s ease-out;
}

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

/* Staggered children */
.reveal-stagger > * {
  opacity: 0;
  transform: translateY(16px);
  transition: opacity 0.5s ease-out, transform 0.5s ease-out;
}

.reveal-stagger.visible > *:nth-child(1) { transition-delay: 0ms; }
.reveal-stagger.visible > *:nth-child(2) { transition-delay: 100ms; }
.reveal-stagger.visible > *:nth-child(3) { transition-delay: 200ms; }
.reveal-stagger.visible > *:nth-child(4) { transition-delay: 300ms; }
.reveal-stagger.visible > *:nth-child(5) { transition-delay: 400ms; }
.reveal-stagger.visible > *:nth-child(6) { transition-delay: 500ms; }
.reveal-stagger.visible > *:nth-child(7) { transition-delay: 600ms; }
.reveal-stagger.visible > *:nth-child(8) { transition-delay: 700ms; }
.reveal-stagger.visible > *:nth-child(9) { transition-delay: 800ms; }

.reveal-stagger.visible > * {
  opacity: 1;
  transform: translateY(0);
}


/* ==========================================================================
   Responsive — Tablet (max-width: 1024px)
   ========================================================================== */

@media (max-width: 1024px) {

  .problem-grid {
    grid-template-columns: 1fr;
    max-width: 560px;
    margin: 0 auto;
  }

  .how-grid {
    grid-template-columns: 1fr;
    gap: var(--space-2xl);
  }

  .persona-grid {
    grid-template-columns: 1fr;
    max-width: 600px;
    margin: 0 auto;
  }

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

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

  .contact-grid {
    grid-template-columns: 1fr;
    gap: var(--space-2xl);
  }
}


/* ==========================================================================
   Responsive — Mobile (max-width: 768px)
   ========================================================================== */

@media (max-width: 768px) {

  /* Navigation */
  .nav-links {
    display: none;
  }

  .nav-cta {
    display: none;
  }

  .hamburger {
    display: flex;
  }

  .mobile-menu {
    display: block;
  }

  /* Hero */
  .hero-content h1 {
    font-size: clamp(2rem, 8vw, var(--text-display-min));
  }

  .hero-sub {
    font-size: 1rem;
  }

  .hero-ctas {
    flex-direction: column;
  }

  .scroll-indicator {
    display: none;
  }

  /* Sections */
  .section,
  .section-alt {
    padding-top: var(--space-3xl);
    padding-bottom: var(--space-3xl);
  }

  .section-header {
    margin-bottom: var(--space-2xl);
  }

  .section-header h2 {
    font-size: var(--text-h2);
  }

  /* ΔE Scale */
  .de-scale {
    overflow-x: auto;
    -webkit-overflow-scrolling: touch;
    padding-bottom: var(--space-md);
  }

  .de-main-labels,
  .de-main-track,
  .de-main-bottom {
    min-width: 600px;
  }

  .de-zoom-connector {
    width: 30%;
  }

  /* Overview */
  .metric-strip {
    gap: var(--space-xl);
  }

  /* How it works */
  .how-grid {
    grid-template-columns: 1fr;
  }

  /* Accuracy */
  .accuracy-bars {
    max-width: 100%;
  }

  /* Database */
  .database-metrics {
    flex-direction: column;
    align-items: center;
    gap: var(--space-xl);
  }

  /* API */
  .building-blocks {
    grid-template-columns: 1fr;
  }

  .code-block {
    padding: var(--space-md);
  }

  .code-block pre {
    font-size: 0.8125rem;
  }

  /* Output Formats */
  .format-grid {
    grid-template-columns: repeat(2, 1fr);
  }

  /* Contact */
  .contact-form .form-row {
    grid-template-columns: 1fr;
  }

  /* Footer */
  .footer-inner {
    flex-direction: column;
    text-align: center;
    gap: var(--space-lg);
  }

  .footer-links {
    flex-wrap: wrap;
    justify-content: center;
  }

  /* Modal */
  .modal {
    padding: var(--space-xl);
    margin: var(--space-md);
  }

  .modal .form-row {
    grid-template-columns: 1fr;
  }

  /* Cookie banner */
  .cookie-inner {
    flex-direction: column;
    text-align: center;
    gap: var(--space-md);
  }
}


/* ==========================================================================
   Responsive — Small Mobile (max-width: 480px)
   ========================================================================== */

@media (max-width: 480px) {

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

  .database-metric .metric-number {
    font-size: 2.5rem;
  }

  .metric-strip {
    flex-direction: column;
    align-items: center;
  }
}