/* ============================================
   ByteThirst Design System & Styles
   Version: 1.0
   ============================================ */

/* --- CSS Custom Properties --- */
:root {
  /* Primary */
  --color-primary: #1B6B4A;
  --color-secondary: #2980B9;
  --color-accent: #E67E22;

  /* Neutrals */
  --color-surface: #F8FAFB;
  --color-surface-alt: #ECF0F1;
  --color-text-primary: #2C3E50;
  --color-text-secondary: #7F8C8D;
  --color-border: #D5DBDB;

  /* Semantic */
  --color-success: #27AE60;
  --color-error: #E74C3C;
  --color-premium: #5B2C8E;

  /* Gradients */
  --gradient-card: linear-gradient(135deg, #0D3B3B 0%, #1B6B4A 100%);
  --gradient-premium: linear-gradient(135deg, #1B6B4A 0%, #5B2C8E 100%);

  /* Typography */
  --font-heading: 'DM Sans', sans-serif;
  --font-body: 'Source Sans 3', sans-serif;
  --font-mono: 'JetBrains Mono', monospace;

  /* Spacing */
  --space-xs: 4px;
  --space-sm: 8px;
  --space-md: 16px;
  --space-lg: 24px;
  --space-xl: 32px;
  --space-2xl: 48px;
  --space-3xl: 64px;
  --space-4xl: 80px;

  /* Layout */
  --max-width: 1120px;
  --max-width-reading: 768px;
  --section-padding: var(--space-4xl);
  --border-radius: 12px;
  --border-radius-sm: 8px;
  --border-radius-lg: 16px;
}

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

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

body {
  font-family: var(--font-body);
  font-size: 1.125rem;
  font-weight: 400;
  line-height: 1.7;
  color: var(--color-text-primary);
  background-color: var(--color-surface);
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}

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

a {
  color: var(--color-secondary);
  text-decoration: none;
  transition: color 0.2s ease;
}

a:hover {
  color: var(--color-primary);
}

a:focus-visible,
button:focus-visible,
input:focus-visible {
  outline: 3px solid var(--color-secondary);
  outline-offset: 2px;
}

ul, ol {
  list-style: none;
}

/* --- Typography --- */
h1, h2, h3, h4, h5, h6 {
  font-family: var(--font-heading);
  color: var(--color-text-primary);
  font-weight: 700;
}

h1 {
  font-size: 3.5rem;
  font-weight: 800;
  line-height: 1.1;
}

h2 {
  font-size: 2.25rem;
  line-height: 1.2;
}

h3 {
  font-size: 1.5rem;
  line-height: 1.3;
}

p {
  margin-bottom: var(--space-md);
}

p:last-child {
  margin-bottom: 0;
}

.text-secondary {
  color: var(--color-text-secondary);
}

.text-small {
  font-size: 0.875rem;
  line-height: 1.6;
}

.text-mono {
  font-family: var(--font-mono);
}

.metric-number {
  font-family: var(--font-mono);
  font-size: 3rem;
  font-weight: 700;
  line-height: 1.1;
}

/* --- Layout --- */
.container {
  width: 100%;
  max-width: var(--max-width);
  margin: 0 auto;
  padding: 0 var(--space-lg);
}

.container--reading {
  max-width: var(--max-width-reading);
}

.section {
  padding: var(--section-padding) 0;
}

.section--alt {
  background-color: var(--color-surface-alt);
}

.section--dark {
  background: var(--gradient-card);
  color: #fff;
}

.section--dark h2,
.section--dark h3 {
  color: #fff;
}

/* --- Header --- */
.site-header {
  position: sticky;
  top: 0;
  z-index: 100;
  background: rgba(248, 250, 251, 0.95);
  backdrop-filter: blur(12px);
  -webkit-backdrop-filter: blur(12px);
  border-bottom: 1px solid var(--color-border);
  padding: var(--space-md) 0;
}

.site-header .container {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: var(--space-md);
}

.site-logo {
  display: flex;
  align-items: center;
  gap: var(--space-sm);
  text-decoration: none;
  flex-shrink: 0;
}

.site-logo__icon {
  width: 32px;
  height: 32px;
}

.site-logo__text {
  font-family: var(--font-heading);
  font-weight: 700;
  font-size: 1.25rem;
  color: var(--color-primary);
}

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

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

.site-nav__link {
  font-family: var(--font-body);
  font-size: 0.9375rem;
  font-weight: 600;
  color: var(--color-text-primary);
  text-decoration: none;
  transition: color 0.2s ease;
}

.site-nav__link:hover {
  color: var(--color-primary);
}

.mobile-nav-toggle {
  display: none;
  background: none;
  border: none;
  cursor: pointer;
  padding: var(--space-sm);
  color: var(--color-text-primary);
}

.mobile-nav-toggle svg {
  width: 24px;
  height: 24px;
}

/* --- Buttons --- */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: var(--space-sm);
  font-family: var(--font-heading);
  font-weight: 700;
  font-size: 1rem;
  padding: 14px 28px;
  border: none;
  border-radius: var(--border-radius-sm);
  cursor: pointer;
  text-decoration: none;
  transition: transform 0.2s ease, box-shadow 0.2s ease, background-color 0.2s ease;
  line-height: 1.2;
}

.btn:hover {
  transform: translateY(-1px);
  box-shadow: 0 4px 12px rgba(0, 0, 0, 0.15);
}

.btn:active {
  transform: translateY(0);
}

.btn--primary {
  background-color: var(--color-accent);
  color: #fff;
}

.btn--primary:hover {
  background-color: #cf711a;
  color: #fff;
}

.btn--header {
  font-size: 0.875rem;
  padding: 10px 20px;
}

.btn--large {
  font-size: 1.125rem;
  padding: 18px 36px;
  border-radius: var(--border-radius);
}

.btn--pulse {
  animation: pulse 2.5s ease-in-out infinite;
}

.btn--pulse:hover {
  animation: none;
}

@keyframes pulse {
  0%, 100% { box-shadow: 0 0 0 0 rgba(230, 126, 34, 0.4); }
  50% { box-shadow: 0 0 0 12px rgba(230, 126, 34, 0); }
}

/* --- Hero Section --- */
.hero {
  background: var(--gradient-card);
  color: #fff;
  padding: 120px 0 var(--section-padding);
  overflow: hidden;
}

.hero .container {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: var(--space-3xl);
  align-items: center;
}

.hero__content {
  max-width: 560px;
}

.hero h1 {
  color: #fff;
  margin-bottom: var(--space-lg);
}

.hero__subtitle {
  font-size: 1.25rem;
  line-height: 1.6;
  color: rgba(255, 255, 255, 0.9);
  margin-bottom: var(--space-xl);
}

.hero__ctas {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: var(--space-md);
  margin-bottom: var(--space-xl);
}

.hero__secondary-link {
  color: #fff;
  text-decoration: underline;
  text-underline-offset: 4px;
  font-weight: 600;
  font-size: 0.9375rem;
}

.hero__secondary-link:hover {
  color: rgba(255, 255, 255, 0.8);
}

.hero__trust {
  font-size: 0.875rem;
  color: rgba(255, 255, 255, 0.7);
  display: flex;
  align-items: center;
  gap: var(--space-sm);
}

.hero__trust svg {
  width: 16px;
  height: 16px;
  flex-shrink: 0;
}

/* Hero animation states */
.hero__content > * {
  opacity: 0;
  transform: translateY(24px);
}

.hero__content.animated > *:nth-child(1) {
  animation: fadeSlideUp 0.6s ease forwards;
  animation-delay: 0s;
}

.hero__content.animated > *:nth-child(2) {
  animation: fadeSlideUp 0.6s ease forwards;
  animation-delay: 0.15s;
}

.hero__content.animated > *:nth-child(3) {
  animation: fadeSlideUp 0.6s ease forwards;
  animation-delay: 0.3s;
}

.hero__content.animated > *:nth-child(4) {
  animation: fadeSlideUp 0.6s ease forwards;
  animation-delay: 0.45s;
}

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

/* --- Dashboard Mockup --- */
.dashboard-mockup {
  background: #fff;
  border-radius: var(--border-radius-lg);
  padding: var(--space-lg);
  box-shadow: 0 20px 60px rgba(0, 0, 0, 0.3), 0 8px 20px rgba(0, 0, 0, 0.15);
  transform: perspective(800px) rotateY(-4deg) rotateX(2deg);
  max-width: 360px;
  margin-left: auto;
  color: var(--color-text-primary);
  position: relative;
}

.dashboard-mockup::before {
  content: '';
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  height: 4px;
  background: var(--gradient-card);
  border-radius: var(--border-radius-lg) var(--border-radius-lg) 0 0;
}

.dashboard-mockup__header {
  font-family: var(--font-heading);
  font-weight: 700;
  font-size: 0.875rem;
  color: var(--color-text-secondary);
  text-transform: uppercase;
  letter-spacing: 0.05em;
  margin-bottom: var(--space-md);
  padding-top: var(--space-sm);
}

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

.dashboard-metric {
  display: flex;
  align-items: baseline;
  gap: var(--space-sm);
}

.dashboard-metric__icon {
  font-size: 1.25rem;
  flex-shrink: 0;
  width: 28px;
  text-align: center;
}

.dashboard-metric__value {
  font-family: var(--font-mono);
  font-weight: 700;
  font-size: 1.75rem;
  color: var(--color-text-primary);
  line-height: 1;
}

.dashboard-metric__unit {
  font-family: var(--font-body);
  font-size: 0.875rem;
  color: var(--color-text-secondary);
  font-weight: 400;
}

.dashboard-metric--water .dashboard-metric__value {
  color: var(--color-secondary);
}

.dashboard-metric--energy .dashboard-metric__value {
  color: var(--color-accent);
}

.dashboard-metric--carbon .dashboard-metric__value {
  color: var(--color-primary);
}

.dashboard-mockup__equiv {
  margin-top: var(--space-md);
  padding: var(--space-sm) var(--space-md);
  background: var(--color-surface-alt);
  border-radius: var(--border-radius-sm);
  font-size: 0.875rem;
  color: var(--color-text-secondary);
  text-align: center;
}

.dashboard-mockup__footer {
  margin-top: var(--space-md);
  font-size: 0.75rem;
  color: var(--color-text-secondary);
  text-align: center;
  padding-top: var(--space-sm);
  border-top: 1px solid var(--color-border);
}

/* --- How It Works --- */
.steps-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: var(--space-xl);
  margin-top: var(--space-2xl);
}

.step-card {
  text-align: center;
  padding: var(--space-xl);
  opacity: 0;
  transform: translateY(20px);
  transition: opacity 0.5s ease, transform 0.5s ease;
}

.step-card.visible {
  opacity: 1;
  transform: translateY(0);
}

.step-card__icon {
  width: 72px;
  height: 72px;
  margin: 0 auto var(--space-lg);
  display: flex;
  align-items: center;
  justify-content: center;
  background: var(--color-surface-alt);
  border-radius: 50%;
}

.step-card__icon svg {
  width: 36px;
  height: 36px;
  color: var(--color-primary);
}

.step-card__number {
  font-family: var(--font-mono);
  font-weight: 700;
  font-size: 0.75rem;
  color: var(--color-accent);
  text-transform: uppercase;
  letter-spacing: 0.1em;
  margin-bottom: var(--space-sm);
}

.step-card h3 {
  margin-bottom: var(--space-sm);
}

.step-card p {
  color: var(--color-text-secondary);
  font-size: 1rem;
}

/* --- Features / Pricing --- */
.features-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: var(--space-xl);
  margin-top: var(--space-2xl);
}

.pricing-card {
  border-radius: var(--border-radius-lg);
  padding: var(--space-2xl);
  opacity: 0;
  transform: translateY(20px);
  transition: opacity 0.5s ease, transform 0.5s ease;
}

.pricing-card.visible {
  opacity: 1;
  transform: translateY(0);
}

.pricing-card--free {
  background: #fff;
  border: 2px solid var(--color-border);
}

.pricing-card--premium {
  background: var(--gradient-premium);
  color: #fff;
  position: relative;
  overflow: hidden;
}

.pricing-card--premium::before {
  content: '';
  position: absolute;
  top: -50%;
  right: -50%;
  width: 200%;
  height: 200%;
  background: radial-gradient(circle, rgba(255,255,255,0.05) 0%, transparent 60%);
  pointer-events: none;
}

.pricing-card--premium h3,
.pricing-card--premium .pricing-card__subheading {
  color: #fff;
}

.pricing-card__badge {
  display: inline-block;
  font-family: var(--font-heading);
  font-weight: 700;
  font-size: 0.75rem;
  text-transform: uppercase;
  letter-spacing: 0.08em;
  padding: var(--space-xs) var(--space-md);
  border-radius: 100px;
  margin-bottom: var(--space-md);
}

.pricing-card--free .pricing-card__badge {
  background: var(--color-surface-alt);
  color: var(--color-primary);
}

.pricing-card--premium .pricing-card__badge {
  background: rgba(255, 255, 255, 0.2);
  color: #fff;
}

.pricing-card__price {
  display: flex;
  align-items: baseline;
  gap: var(--space-sm);
  margin-bottom: var(--space-sm);
}

.pricing-card__amount {
  font-family: var(--font-mono);
  font-weight: 700;
  font-size: 3rem;
  line-height: 1;
}

.pricing-card--free .pricing-card__amount {
  color: var(--color-primary);
}

.pricing-card__period {
  font-size: 1rem;
  color: var(--color-text-secondary);
}

.pricing-card--premium .pricing-card__period {
  color: rgba(255, 255, 255, 0.7);
}

.pricing-card__subheading {
  font-size: 0.9375rem;
  color: var(--color-text-secondary);
  margin-bottom: var(--space-lg);
}

.pricing-card__features {
  display: flex;
  flex-direction: column;
  gap: var(--space-sm);
  margin-bottom: var(--space-xl);
}

.pricing-card__feature {
  display: flex;
  align-items: flex-start;
  gap: var(--space-sm);
  font-size: 0.9375rem;
  line-height: 1.5;
}

.pricing-card__feature-icon {
  flex-shrink: 0;
  width: 20px;
  height: 20px;
  margin-top: 2px;
}

.pricing-card--free .pricing-card__feature-icon {
  color: var(--color-success);
}

.pricing-card--premium .pricing-card__feature-icon {
  color: rgba(255, 255, 255, 0.9);
}

.pricing-card__note {
  font-size: 0.8125rem;
  color: var(--color-text-secondary);
  margin-top: var(--space-md);
}

.pricing-card--premium .pricing-card__note {
  color: rgba(255, 255, 255, 0.6);
}

/* --- Social Impact Card --- */
.social-card-wrapper {
  display: flex;
  justify-content: center;
  padding: var(--space-xl) 0;
}

.social-card {
  background: var(--gradient-card);
  color: #fff;
  border-radius: var(--border-radius-lg);
  padding: var(--space-2xl) var(--space-xl);
  max-width: 600px;
  width: 100%;
  box-shadow: 0 20px 60px rgba(0, 0, 0, 0.2);
  transform: perspective(600px) rotateX(2deg) rotateY(-2deg);
  position: relative;
}

.social-card__logo {
  display: flex;
  align-items: center;
  gap: var(--space-sm);
  margin-bottom: var(--space-xl);
}

.social-card__logo svg {
  width: 24px;
  height: 24px;
}

.social-card__logo span {
  font-family: var(--font-heading);
  font-weight: 700;
  font-size: 0.875rem;
  opacity: 0.8;
}

.social-card__intro {
  font-size: 1.125rem;
  opacity: 0.9;
  margin-bottom: var(--space-lg);
}

.social-card__metrics {
  display: flex;
  flex-wrap: wrap;
  gap: var(--space-lg);
  margin-bottom: var(--space-lg);
}

.social-card__metric {
  display: flex;
  align-items: center;
  gap: var(--space-sm);
}

.social-card__metric-icon {
  font-size: 1.25rem;
}

.social-card__metric-value {
  font-family: var(--font-mono);
  font-weight: 700;
  font-size: 1.5rem;
}

.social-card__metric-unit {
  font-size: 0.875rem;
  opacity: 0.8;
}

.social-card__equiv {
  font-size: 1rem;
  opacity: 0.8;
  margin-bottom: var(--space-sm);
}

.social-card__queries {
  font-size: 0.875rem;
  opacity: 0.6;
  margin-bottom: var(--space-xl);
}

.social-card__footer {
  display: flex;
  justify-content: space-between;
  align-items: flex-end;
  padding-top: var(--space-md);
  border-top: 1px solid rgba(255, 255, 255, 0.15);
}

.social-card__cta {
  font-size: 0.8125rem;
  opacity: 0.6;
}

.social-card__hashtag {
  font-family: var(--font-heading);
  font-weight: 700;
  font-size: 0.875rem;
  opacity: 0.7;
}

/* --- Privacy Promise --- */
.privacy-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: var(--space-2xl);
  margin-top: var(--space-2xl);
}

.privacy-column h3 {
  margin-bottom: var(--space-lg);
}

.privacy-list {
  display: flex;
  flex-direction: column;
  gap: var(--space-sm);
}

.privacy-list__item {
  display: flex;
  align-items: flex-start;
  gap: var(--space-sm);
  font-size: 0.9375rem;
  line-height: 1.5;
}

.privacy-list__icon {
  flex-shrink: 0;
  width: 20px;
  height: 20px;
  margin-top: 2px;
}

.privacy-list__icon--no {
  color: var(--color-error);
}

.privacy-list__icon--yes {
  color: var(--color-success);
}

.privacy-summary {
  margin-top: var(--space-2xl);
  text-align: center;
  max-width: 720px;
  margin-left: auto;
  margin-right: auto;
}

.privacy-summary p {
  font-size: 0.9375rem;
  color: var(--color-text-secondary);
  margin-bottom: var(--space-md);
}

/* --- Methodology Teaser --- */
.pipeline-flow {
  display: flex;
  align-items: center;
  justify-content: center;
  flex-wrap: wrap;
  gap: var(--space-sm);
  margin: var(--space-2xl) 0;
  padding: var(--space-lg);
}

.pipeline-step {
  background: var(--color-surface-alt);
  border: 1px solid var(--color-border);
  border-radius: var(--border-radius-sm);
  padding: var(--space-sm) var(--space-md);
  font-family: var(--font-mono);
  font-size: 0.8125rem;
  font-weight: 500;
  color: var(--color-text-primary);
  white-space: nowrap;
}

.pipeline-arrow {
  color: var(--color-primary);
  font-size: 1.25rem;
  font-weight: 700;
}

.data-callouts {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: var(--space-lg);
  margin-top: var(--space-2xl);
}

.data-callout {
  text-align: center;
  padding: var(--space-lg);
  background: var(--color-surface-alt);
  border-radius: var(--border-radius);
  border: 1px solid var(--color-border);
  opacity: 0;
  transform: translateY(20px);
  transition: opacity 0.5s ease, transform 0.5s ease;
}

.data-callout.visible {
  opacity: 1;
  transform: translateY(0);
}

.data-callout__value {
  font-family: var(--font-mono);
  font-weight: 700;
  font-size: 2rem;
  color: var(--color-primary);
  line-height: 1.2;
}

.data-callout__label {
  font-size: 0.9375rem;
  color: var(--color-text-primary);
  margin: var(--space-sm) 0;
}

.data-callout__source {
  font-size: 0.75rem;
  color: var(--color-text-secondary);
}

/* --- Donation Section --- */
.donation-counter {
  display: flex;
  flex-wrap: wrap;
  justify-content: center;
  gap: var(--space-2xl);
  margin: var(--space-2xl) 0;
}

.donation-stat {
  text-align: center;
}

.donation-stat__value {
  font-family: var(--font-mono);
  font-weight: 700;
  font-size: 3rem;
  line-height: 1;
  color: #fff;
}

.donation-stat__label {
  font-size: 0.875rem;
  color: rgba(255, 255, 255, 0.7);
  margin-top: var(--space-sm);
}

.donation-note {
  text-align: center;
  font-size: 0.9375rem;
  color: rgba(255, 255, 255, 0.7);
  margin-top: var(--space-sm);
}

.donation-partner {
  text-align: center;
  font-size: 0.875rem;
  color: rgba(255, 255, 255, 0.6);
  margin-top: var(--space-xl);
}

/* --- Beta Signup --- */
.beta-signup {
  text-align: center;
  max-width: 560px;
  margin: 0 auto;
}

.beta-form {
  margin-top: var(--space-xl);
}

.beta-form__row {
  display: flex;
  gap: var(--space-sm);
  max-width: 480px;
  margin: 0 auto;
}

.beta-form__input {
  flex: 1;
  font-family: var(--font-body);
  font-size: 1rem;
  padding: 14px 20px;
  border: 2px solid var(--color-border);
  border-radius: var(--border-radius-sm);
  background: #fff;
  color: var(--color-text-primary);
  transition: border-color 0.2s ease;
}

.beta-form__input::placeholder {
  color: var(--color-text-secondary);
}

.beta-form__input:focus {
  border-color: var(--color-secondary);
  outline: none;
}

.beta-form__input--error {
  border-color: var(--color-error);
}

.beta-form__error {
  font-size: 0.8125rem;
  color: var(--color-error);
  margin-top: var(--space-sm);
  text-align: left;
  display: none;
}

.beta-form__error.visible {
  display: block;
}

.beta-form__note {
  font-size: 0.8125rem;
  color: var(--color-text-secondary);
  margin-top: var(--space-md);
}

/* Honeypot */
.beta-form__hp {
  position: absolute;
  left: -9999px;
  opacity: 0;
  height: 0;
  width: 0;
  overflow: hidden;
}

/* Success state */
.beta-success {
  text-align: center;
  display: none;
}

.beta-success.visible {
  display: block;
}

.beta-success__icon {
  font-size: 2.5rem;
  margin-bottom: var(--space-md);
}

.beta-success h3 {
  margin-bottom: var(--space-sm);
}

.beta-success p {
  color: var(--color-text-secondary);
}

/* Follow-up options */
.beta-followup {
  display: none;
  margin-top: var(--space-xl);
  padding: var(--space-lg);
  background: var(--color-surface-alt);
  border-radius: var(--border-radius-sm);
  max-width: 480px;
  margin-left: auto;
  margin-right: auto;
  text-align: left;
}

.beta-followup.visible {
  display: block;
}

.beta-followup__title {
  font-family: var(--font-heading);
  font-weight: 700;
  font-size: 0.9375rem;
  margin-bottom: var(--space-md);
}

.beta-followup__option {
  display: flex;
  align-items: center;
  gap: var(--space-sm);
  margin-bottom: var(--space-sm);
  cursor: pointer;
  font-size: 0.9375rem;
}

.beta-followup__option input[type="checkbox"] {
  width: 18px;
  height: 18px;
  accent-color: var(--color-primary);
}

.beta-followup__submit {
  margin-top: var(--space-md);
  width: 100%;
}

.beta-followup__thanks {
  display: none;
  margin-top: var(--space-md);
  font-size: 0.9375rem;
  color: var(--color-primary);
  font-weight: 600;
  text-align: center;
  cursor: pointer;
}

/* --- Footer --- */
.site-footer {
  background: var(--color-text-primary);
  color: rgba(255, 255, 255, 0.7);
  padding: var(--space-2xl) 0 var(--space-xl);
}

.site-footer .container {
  display: grid;
  grid-template-columns: 1fr auto 1fr;
  gap: var(--space-xl);
  align-items: start;
}

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

.footer-brand__logo svg {
  width: 28px;
  height: 28px;
}

.footer-brand__text {
  font-family: var(--font-heading);
  font-weight: 700;
  color: #fff;
  font-size: 1rem;
}

.footer-brand__copy {
  font-size: 0.8125rem;
  color: rgba(255, 255, 255, 0.5);
  margin-left: var(--space-md);
}

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

.footer-link {
  color: rgba(255, 255, 255, 0.7);
  font-size: 0.875rem;
  text-decoration: none;
  transition: color 0.2s ease;
}

.footer-link:hover {
  color: #fff;
}

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

.footer-social__link {
  color: rgba(255, 255, 255, 0.6);
  transition: color 0.2s ease;
}

.footer-social__link:hover {
  color: #fff;
}

.footer-social__link svg {
  width: 20px;
  height: 20px;
}

.footer-donation {
  grid-column: 1 / -1;
  text-align: center;
  font-size: 0.8125rem;
  color: rgba(255, 255, 255, 0.5);
  padding-top: var(--space-lg);
  border-top: 1px solid rgba(255, 255, 255, 0.1);
  margin-top: var(--space-md);
}

/* --- Section Headers --- */
.section-header {
  text-align: center;
  max-width: 640px;
  margin: 0 auto var(--space-xl);
}

.section-header h2 {
  margin-bottom: var(--space-sm);
}

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

/* --- Legal / Content Pages --- */
.legal-content {
  padding-top: 40px;
}

.legal-content h1 {
  font-size: 2.5rem;
  margin-bottom: var(--space-sm);
}

.legal-content .legal-meta {
  color: var(--color-text-secondary);
  font-size: 0.875rem;
  margin-bottom: var(--space-2xl);
  padding-bottom: var(--space-lg);
  border-bottom: 1px solid var(--color-border);
}

.legal-content h2 {
  font-size: 1.75rem;
  margin-top: var(--space-2xl);
  margin-bottom: var(--space-md);
}

.legal-content h3 {
  font-size: 1.25rem;
  margin-top: var(--space-xl);
  margin-bottom: var(--space-sm);
}

.legal-content p {
  margin-bottom: var(--space-md);
  line-height: 1.8;
}

.legal-content ul,
.legal-content ol {
  margin-bottom: var(--space-md);
  padding-left: var(--space-xl);
}

.legal-content ul {
  list-style-type: disc;
}

.legal-content ol {
  list-style-type: decimal;
}

.legal-content li {
  margin-bottom: var(--space-sm);
  line-height: 1.7;
}

.legal-content strong {
  font-weight: 600;
}

.legal-content a {
  color: var(--color-secondary);
  text-decoration: underline;
  text-underline-offset: 3px;
}

/* Short version callout */
.legal-callout {
  background: var(--color-surface-alt);
  border-left: 4px solid var(--color-primary);
  padding: var(--space-lg);
  border-radius: 0 var(--border-radius-sm) var(--border-radius-sm) 0;
  margin-bottom: var(--space-xl);
}

.legal-callout p:last-child {
  margin-bottom: 0;
}

.legal-callout ul {
  margin-bottom: 0;
}

/* --- Methodology-specific --- */
.methodology-table {
  width: 100%;
  border-collapse: collapse;
  margin: var(--space-lg) 0;
  font-size: 0.9375rem;
}

.methodology-table th,
.methodology-table td {
  padding: var(--space-sm) var(--space-md);
  text-align: left;
  border-bottom: 1px solid var(--color-border);
}

.methodology-table th {
  font-family: var(--font-heading);
  font-weight: 700;
  font-size: 0.8125rem;
  text-transform: uppercase;
  letter-spacing: 0.05em;
  color: var(--color-text-secondary);
  background: var(--color-surface-alt);
}

.methodology-table td {
  vertical-align: top;
}

.methodology-table tr:last-child td {
  border-bottom: none;
}

.methodology-table code {
  font-family: var(--font-mono);
  font-size: 0.8125rem;
  background: var(--color-surface-alt);
  padding: 2px 6px;
  border-radius: 4px;
}

.code-block {
  font-family: var(--font-mono);
  font-size: 0.875rem;
  background: var(--color-surface-alt);
  border: 1px solid var(--color-border);
  border-radius: var(--border-radius-sm);
  padding: var(--space-md);
  margin: var(--space-md) 0;
  overflow-x: auto;
}

.methodology-pipeline {
  display: flex;
  align-items: center;
  justify-content: center;
  flex-wrap: wrap;
  gap: var(--space-sm);
  margin: var(--space-xl) 0;
  padding: var(--space-xl);
  background: var(--color-surface-alt);
  border-radius: var(--border-radius);
  border: 1px solid var(--color-border);
}

.methodology-pipeline .pipeline-step {
  background: #fff;
}

/* Changelog table */
.changelog-table {
  width: 100%;
  border-collapse: collapse;
  margin: var(--space-md) 0;
}

.changelog-table th,
.changelog-table td {
  padding: var(--space-sm) var(--space-md);
  text-align: left;
  border-bottom: 1px solid var(--color-border);
  font-size: 0.9375rem;
}

.changelog-table th {
  font-family: var(--font-heading);
  font-weight: 700;
  font-size: 0.8125rem;
  text-transform: uppercase;
  letter-spacing: 0.05em;
  color: var(--color-text-secondary);
}


/* --- 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);
}

.fade-in-delay-1 { transition-delay: 0.1s; }
.fade-in-delay-2 { transition-delay: 0.2s; }
.fade-in-delay-3 { transition-delay: 0.3s; }

/* ============================================
   Responsive Styles
   ============================================ */

/* Tablet and below */
@media (max-width: 1024px) {
  .hero .container {
    grid-template-columns: 1fr;
    gap: var(--space-2xl);
  }

  .dashboard-mockup {
    margin: 0 auto;
    transform: perspective(800px) rotateY(-2deg) rotateX(1deg);
  }
}

/* Mobile */
@media (max-width: 768px) {
  :root {
    --section-padding: var(--space-2xl);
  }

  h1 {
    font-size: 2.25rem;
  }

  h2 {
    font-size: 1.75rem;
  }

  h3 {
    font-size: 1.25rem;
  }

  body {
    font-size: 1rem;
  }

  .metric-number {
    font-size: 2rem;
  }

  /* Header mobile */
  .site-nav__links {
    display: none;
    position: absolute;
    top: 100%;
    left: 0;
    right: 0;
    background: var(--color-surface);
    flex-direction: column;
    padding: var(--space-md) var(--space-lg);
    border-bottom: 1px solid var(--color-border);
    box-shadow: 0 4px 12px rgba(0, 0, 0, 0.08);
  }

  .site-nav__links.open {
    display: flex;
  }

  .site-nav .btn--header {
    display: none;
  }

  .mobile-nav-toggle {
    display: block;
  }

  /* Hero mobile */
  .hero {
    padding: 80px 0 var(--section-padding);
  }

  .hero__subtitle {
    font-size: 1.0625rem;
  }

  .hero__ctas {
    flex-direction: column;
    align-items: flex-start;
  }

  .dashboard-mockup {
    max-width: 100%;
    transform: none;
  }

  /* Steps mobile */
  .steps-grid {
    grid-template-columns: 1fr;
    gap: var(--space-lg);
  }

  /* Features mobile */
  .features-grid {
    grid-template-columns: 1fr;
  }

  /* Privacy grid mobile */
  .privacy-grid {
    grid-template-columns: 1fr;
    gap: var(--space-xl);
  }

  /* Data callouts mobile */
  .data-callouts {
    grid-template-columns: 1fr;
    gap: var(--space-md);
  }

  /* Pipeline mobile */
  .pipeline-flow,
  .methodology-pipeline {
    flex-direction: column;
  }

  .pipeline-arrow {
    transform: rotate(90deg);
  }

  /* Social card mobile */
  .social-card {
    transform: none;
    padding: var(--space-xl) var(--space-md);
  }

  .social-card__metrics {
    flex-direction: column;
    gap: var(--space-md);
  }

  /* Beta form mobile */
  .beta-form__row {
    flex-direction: column;
  }

  /* Footer mobile */
  .site-footer .container {
    grid-template-columns: 1fr;
    text-align: center;
    gap: var(--space-lg);
  }

  .footer-brand {
    justify-content: center;
  }

  .footer-links {
    flex-wrap: wrap;
    gap: var(--space-md);
  }

  .footer-social {
    justify-content: center;
  }

  /* Donation counter mobile */
  .donation-counter {
    flex-direction: column;
    gap: var(--space-lg);
  }

  .donation-stat__value {
    font-size: 2.25rem;
  }

  /* Tables mobile */
  .methodology-table {
    font-size: 0.8125rem;
  }

  .methodology-table th,
  .methodology-table td {
    padding: var(--space-xs) var(--space-sm);
  }

  /* Pricing amount mobile */
  .pricing-card__amount {
    font-size: 2.25rem;
  }

  .data-callout__value {
    font-size: 1.5rem;
  }

  .legal-content h1 {
    font-size: 1.75rem;
  }

  .legal-content h2 {
    font-size: 1.375rem;
  }
}

/* Small mobile */
@media (max-width: 375px) {
  .container {
    padding: 0 var(--space-md);
  }

  .social-card__footer {
    flex-direction: column;
    align-items: center;
    gap: var(--space-sm);
  }
}