/* ==========================================================================
   KleinBuchhaltung – main.css
   Global layout, design tokens, typography, and section styles
   ========================================================================== */

/* --------------------------------------------------------------------------
   Design Tokens
   -------------------------------------------------------------------------- */
:root {
  /* Brand colors */
  --color-primary:        #1a3a5c;
  --color-primary-dark:   #0f2440;
  --color-primary-light:  #1e4976;
  --color-accent:         #2e7d32;
  --color-accent-hover:   #1b5e20;
  --color-accent-light:   #e8f5e9;
  --color-danger:         #c62828;

  /* Surface colors */
  --color-background:     #f4f6f9;
  --color-surface:        #ffffff;
  --color-surface-raised: #ffffff;
  --color-border:         #d8dde6;
  --color-border-light:   #edf0f5;

  /* Text colors */
  --color-text:           #1a1f2e;
  --color-text-muted:     #6b7280;
  --color-text-inverse:   #ffffff;

  /* Semantic accounting colors */
  --color-credit:         #2e7d32;
  --color-credit-bg:      #e8f5e9;
  --color-debit:          #c62828;
  --color-debit-bg:       #fce8e8;

  /* Spacing scale */
  --space-xs:   0.25rem;   /* 4px  */
  --space-sm:   0.5rem;    /* 8px  */
  --space-md:   1rem;      /* 16px */
  --space-lg:   1.5rem;    /* 24px */
  --space-xl:   2.5rem;    /* 40px */
  --space-2xl:  4rem;      /* 64px */
  --space-3xl:  6rem;      /* 96px */

  /* Typography */
  --font-sans:        system-ui, -apple-system, "Segoe UI", Roboto, sans-serif;
  --font-mono:        ui-monospace, "Cascadia Code", "Courier New", monospace;
  --font-size-xs:     0.75rem;    /* 12px */
  --font-size-sm:     0.875rem;   /* 14px */
  --font-size-base:   1rem;       /* 16px */
  --font-size-lg:     1.125rem;   /* 18px */
  --font-size-xl:     1.375rem;   /* 22px */
  --font-size-2xl:    1.75rem;    /* 28px */
  --font-size-3xl:    2.25rem;    /* 36px */
  --font-size-4xl:    3rem;       /* 48px */
  --font-size-5xl:    3.75rem;    /* 60px */

  /* Layout */
  --container-max:    1200px;
  --container-md:     800px;

  /* Borders */
  --radius-sm:   0.375rem;
  --radius-md:   0.625rem;
  --radius-lg:   1rem;
  --radius-xl:   1.5rem;
  --radius-full: 9999px;

  /* Shadows */
  --shadow-xs:   0 1px 2px rgba(15, 36, 64, 0.06);
  --shadow-sm:   0 1px 4px rgba(15, 36, 64, 0.08), 0 1px 2px rgba(15, 36, 64, 0.04);
  --shadow-md:   0 4px 12px rgba(15, 36, 64, 0.10), 0 2px 4px rgba(15, 36, 64, 0.06);
  --shadow-lg:   0 8px 32px rgba(15, 36, 64, 0.14), 0 4px 8px rgba(15, 36, 64, 0.06);
  --shadow-xl:   0 20px 60px rgba(15, 36, 64, 0.18);

  /* Transitions */
  --transition-fast:   0.12s ease;
  --transition-base:   0.2s ease;
  --transition-slow:   0.35s ease;
}

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

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

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

img,
svg {
  max-width: 100%;
  display: block;
}

ul,
ol {
  list-style: none;
}

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

h1, h2, h3, h4, h5, h6 {
  line-height: 1.25;
  font-weight: 700;
}

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

/* --------------------------------------------------------------------------
   Section Typography Helpers
   -------------------------------------------------------------------------- */
.section__title {
  font-size: var(--font-size-2xl);
  font-weight: 800;
  text-align: center;
  color: var(--color-primary);
  margin-bottom: var(--space-sm);
  letter-spacing: -0.5px;
}

.section__sub {
  font-size: var(--font-size-lg);
  text-align: center;
  color: var(--color-text-muted);
  max-width: 600px;
  margin-inline: auto;
  margin-bottom: var(--space-2xl);
  line-height: 1.7;
}

/* ==========================================================================
   HEADER / NAVIGATION
   ========================================================================== */
.site-header {
  position: sticky;
  top: 0;
  z-index: 200;
  background-color: var(--color-primary);
  box-shadow: 0 1px 0 rgba(255, 255, 255, 0.06), var(--shadow-md);
}

.nav {
  display: flex;
  align-items: center;
  gap: var(--space-md);
  max-width: var(--container-max);
  margin-inline: auto;
  padding: var(--space-sm) var(--space-md);
  min-height: 3.5rem;
}

/* Logo */
.nav__logo {
  display: flex;
  align-items: center;
  gap: var(--space-sm);
  font-size: var(--font-size-lg);
  font-weight: 800;
  color: var(--color-text-inverse);
  letter-spacing: -0.4px;
  white-space: nowrap;
  flex-shrink: 0;
}

.nav__logo-icon {
  flex-shrink: 0;
}

/* Mobile toggle (CSS-only checkbox hack) */
.nav__toggle-input {
  display: none;
}

.nav__burger {
  display: flex;
  flex-direction: column;
  gap: 5px;
  padding: var(--space-xs);
  cursor: pointer;
  margin-left: auto;
  order: 3;
}

.nav__burger span {
  display: block;
  width: 22px;
  height: 2px;
  background-color: rgba(255, 255, 255, 0.85);
  border-radius: var(--radius-full);
  transition: background-color var(--transition-fast);
}

.nav__burger:hover span {
  background-color: #ffffff;
}

/* Nav links */
.nav__links {
  display: none;
  flex-direction: column;
  gap: 0;

  /* Mobile dropdown overlay */
  position: absolute;
  top: 100%;
  left: 0;
  right: 0;
  background-color: var(--color-primary-dark);
  padding: var(--space-sm) 0;
  box-shadow: var(--shadow-lg);
  z-index: 100;
}

.nav__toggle-input:checked ~ .nav__links {
  display: flex;
}

.nav__links li {
  width: 100%;
}

.nav__links a {
  display: block;
  padding: var(--space-sm) var(--space-md);
  color: rgba(255, 255, 255, 0.8);
  font-size: var(--font-size-sm);
  font-weight: 500;
  transition: color var(--transition-fast), background-color var(--transition-fast);
}

.nav__links a:hover {
  color: #ffffff;
  background-color: rgba(255, 255, 255, 0.07);
}

/* CTA in nav */
.nav__cta {
  display: none;
}

/* ==========================================================================
   HERO
   ========================================================================== */
.hero {
  background: linear-gradient(140deg, var(--color-primary-dark) 0%, var(--color-primary) 55%, var(--color-primary-light) 100%);
  color: var(--color-text-inverse);
  padding: var(--space-2xl) var(--space-md);
  position: relative;
  overflow: hidden;
  display: flex;
  align-items: center;
  min-height: calc(100svh - 3.5rem);
}

/* Subtle geometric pattern overlay */
.hero::before {
  content: '';
  position: absolute;
  inset: 0;
  background-image: url("data:image/svg+xml,%3Csvg width='80' height='80' viewBox='0 0 80 80' xmlns='http://www.w3.org/2000/svg'%3E%3Cg fill='%23ffffff' fill-opacity='0.025' fill-rule='evenodd'%3E%3Cpath d='M0 0h40v40H0V0zm40 40h40v40H40V40zm0-40h2l-2 2V0zm0 4l4-4h2l-6 6V4zm0 4l8-8h2L40 10V8zm0 4L52 0h2L40 14v-2zm0 4L56 0h2L40 18v-2zm0 4L60 0h2L40 22v-2zm0 4L64 0h2L40 26v-2zm0 4L68 0h2L40 30v-2zm0 4L72 0h2L40 34v-2zm0 4L76 0h2L40 38v-2zm0 4L80 0v2L42 40h-2zm4 0L80 4v2L46 40h-2zm4 0L80 8v2L50 40h-2zm4 0L80 12v2L54 40h-2zm4 0L80 16v2L58 40h-2zm4 0L80 20v2L62 40h-2zm4 0L80 24v2L66 40h-2zm4 0L80 28v2L70 40h-2zm4 0L80 32v2L74 40h-2zm4 0L80 36v2L78 40h-2zm4 0L80 40L80 40h-2z'/%3E%3C/g%3E%3C/svg%3E");
  pointer-events: none;
}

.hero__content {
  position: relative;
  z-index: 1;
  max-width: 580px;
  width: 100%;
}

.hero__eyebrow {
  display: inline-flex;
  align-items: center;
  gap: var(--space-xs);
  font-size: var(--font-size-sm);
  font-weight: 600;
  color: rgba(255, 255, 255, 0.6);
  text-transform: uppercase;
  letter-spacing: 0.08em;
  margin-bottom: var(--space-md);
  border: 1px solid rgba(255, 255, 255, 0.15);
  padding: var(--space-xs) var(--space-md);
  border-radius: var(--radius-full);
  background: rgba(255, 255, 255, 0.06);
}

.hero__headline {
  font-size: var(--font-size-4xl);
  font-weight: 900;
  line-height: 1.1;
  letter-spacing: -1.5px;
  margin-bottom: var(--space-md);
}

.hero__headline-accent {
  color: #4caf50;
}

.hero__sub {
  font-size: var(--font-size-lg);
  color: rgba(255, 255, 255, 0.75);
  line-height: 1.7;
  margin-bottom: var(--space-xl);
  max-width: 480px;
}

.hero__actions {
  display: flex;
  flex-direction: column;
  align-items: flex-start;
  gap: var(--space-sm);
  margin-bottom: var(--space-md);
}

.hero__note {
  font-size: var(--font-size-xs);
  color: rgba(255, 255, 255, 0.4);
  letter-spacing: 0.02em;
}

/* Dashboard mockup (hidden on small screens, decorative) */
.hero__visual {
  display: none;
  position: relative;
  z-index: 1;
  flex-shrink: 0;
}

/* CSS Dashboard Mockup */
.mockup {
  background: rgba(255, 255, 255, 0.97);
  border-radius: var(--radius-xl);
  box-shadow: var(--shadow-xl), 0 0 0 1px rgba(255, 255, 255, 0.1);
  overflow: hidden;
  width: 340px;
}

.mockup__topbar {
  display: flex;
  align-items: center;
  gap: 6px;
  padding: 0.625rem var(--space-md);
  background: var(--color-border-light);
  border-bottom: 1px solid var(--color-border);
}

.mockup__dot {
  width: 10px;
  height: 10px;
  border-radius: var(--radius-full);
}

.mockup__dot--red    { background: #ff5f57; }
.mockup__dot--yellow { background: #febc2e; }
.mockup__dot--green  { background: #28c840; }

.mockup__address-bar {
  flex: 1;
  height: 8px;
  background: var(--color-border);
  border-radius: var(--radius-full);
  margin-left: var(--space-sm);
  opacity: 0.6;
}

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

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

.mockup__stat-card {
  padding: var(--space-sm) var(--space-md);
  border-radius: var(--radius-md);
  display: flex;
  flex-direction: column;
  gap: var(--space-xs);
}

.mockup__stat-card--credit {
  background: var(--color-credit-bg);
  border: 1px solid rgba(46, 125, 50, 0.2);
}

.mockup__stat-card--debit {
  background: var(--color-debit-bg);
  border: 1px solid rgba(198, 40, 40, 0.2);
}

.mockup__stat-label {
  height: 6px;
  border-radius: var(--radius-full);
  background: currentColor;
  opacity: 0.2;
  width: 60%;
}

.mockup__stat-value {
  height: 18px;
  border-radius: var(--radius-sm);
  background: currentColor;
  opacity: 0.25;
  width: 80%;
}

.mockup__stat-card--credit { color: var(--color-credit); }
.mockup__stat-card--debit  { color: var(--color-debit); }

.mockup__stat-badge {
  width: 20px;
  height: 10px;
  border-radius: var(--radius-full);
  background: currentColor;
  opacity: 0.3;
}

/* Chart bars */
.mockup__chart {
  display: flex;
  align-items: flex-end;
  gap: 6px;
  height: 72px;
  padding: var(--space-xs) 0;
  background: var(--color-background);
  border-radius: var(--radius-md);
  padding: var(--space-sm);
}

.mockup__bar {
  flex: 1;
  border-radius: 3px 3px 0 0;
  background: var(--color-primary);
  opacity: 0.25;
  height: var(--bar-h, 60%);
  transition: opacity var(--transition-base);
}

.mockup__bar--active {
  opacity: 0.8;
  background: var(--color-accent);
}

/* Transaction rows in mockup */
.mockup__rows {
  display: flex;
  flex-direction: column;
  gap: var(--space-sm);
}

.mockup__row {
  display: flex;
  align-items: center;
  gap: var(--space-sm);
  padding: var(--space-xs) 0;
  border-bottom: 1px solid var(--color-border-light);
}

.mockup__row:last-child {
  border-bottom: none;
}

.mockup__row-icon {
  width: 28px;
  height: 28px;
  border-radius: var(--radius-sm);
  background: var(--color-credit-bg);
  flex-shrink: 0;
}

.mockup__row-icon--debit {
  background: var(--color-debit-bg);
}

.mockup__row-text {
  flex: 1;
  display: flex;
  flex-direction: column;
  gap: 4px;
}

.mockup__row-line {
  height: 7px;
  border-radius: var(--radius-full);
  background: var(--color-border);
}

.mockup__row-line--short {
  width: 55%;
  opacity: 0.7;
}

.mockup__row-amount {
  width: 48px;
  height: 12px;
  border-radius: var(--radius-full);
  flex-shrink: 0;
}

.mockup__row-amount--credit { background: var(--color-credit); opacity: 0.35; }
.mockup__row-amount--debit  { background: var(--color-debit);  opacity: 0.35; }

/* ==========================================================================
   FEATURES
   ========================================================================== */
.features {
  padding: var(--space-3xl) var(--space-md);
  background-color: var(--color-surface);
}

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

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

.feature-card:hover {
  box-shadow: var(--shadow-md);
  transform: translateY(-2px);
  border-color: rgba(26, 58, 92, 0.2);
}

.feature-card__icon {
  width: 3rem;
  height: 3rem;
  border-radius: var(--radius-md);
  display: flex;
  align-items: center;
  justify-content: center;
  margin-bottom: var(--space-md);
  flex-shrink: 0;
}

.feature-card__icon--invoice  { background: #1a73e8; }
.feature-card__icon--bank     { background: var(--color-primary); }
.feature-card__icon--calendar { background: var(--color-accent); }
.feature-card__icon--docs     { background: #7b5ea7; }
.feature-card__icon--chart    { background: #e65100; }
.feature-card__icon--shield   { background: #00695c; }

.feature-card h3 {
  font-size: var(--font-size-lg);
  font-weight: 700;
  color: var(--color-primary);
  margin-bottom: var(--space-xs);
}

.feature-card p {
  font-size: var(--font-size-sm);
  color: var(--color-text-muted);
  line-height: 1.75;
}

/* ==========================================================================
   HOW IT WORKS
   ========================================================================== */
.how-it-works {
  padding: var(--space-3xl) var(--space-md);
  background-color: var(--color-background);
  border-top: 1px solid var(--color-border);
  border-bottom: 1px solid var(--color-border);
}

.hiw-steps {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 0;
  max-width: 860px;
  margin-inline: auto;
}

.hiw-step {
  display: flex;
  flex-direction: column;
  align-items: center;
  text-align: center;
  padding: var(--space-lg);
  background: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-lg);
  width: 100%;
  max-width: 300px;
  position: relative;
}

.hiw-step__number {
  position: absolute;
  top: -0.875rem;
  left: 50%;
  transform: translateX(-50%);
  width: 1.75rem;
  height: 1.75rem;
  background: var(--color-primary);
  color: var(--color-text-inverse);
  font-size: var(--font-size-sm);
  font-weight: 800;
  border-radius: var(--radius-full);
  display: flex;
  align-items: center;
  justify-content: center;
  box-shadow: var(--shadow-sm);
}

.hiw-step__icon {
  width: 3.5rem;
  height: 3.5rem;
  border-radius: var(--radius-full);
  background: var(--color-accent-light);
  color: var(--color-accent);
  display: flex;
  align-items: center;
  justify-content: center;
  margin-bottom: var(--space-md);
  margin-top: var(--space-sm);
}

.hiw-step__title {
  font-size: var(--font-size-lg);
  font-weight: 700;
  color: var(--color-primary);
  margin-bottom: var(--space-xs);
}

.hiw-step__desc {
  font-size: var(--font-size-sm);
  color: var(--color-text-muted);
  line-height: 1.7;
}

/* Connector arrow between steps */
.hiw-step__connector {
  color: var(--color-border);
  transform: rotate(90deg);
  margin: var(--space-sm) 0;
  flex-shrink: 0;
}

/* ==========================================================================
   INTEGRATIONS
   ========================================================================== */
.integrations {
  padding: var(--space-3xl) var(--space-md);
  background-color: var(--color-surface);
}

.integration-list {
  display: flex;
  flex-wrap: wrap;
  gap: var(--space-md);
  justify-content: center;
  align-items: stretch;
  max-width: 860px;
  margin-inline: auto;
}

.integration-item {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: var(--space-xs);
  padding: var(--space-md) var(--space-lg);
  background: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-lg);
  min-width: 130px;
  text-align: center;
  transition: box-shadow var(--transition-base), transform var(--transition-base);
}

.integration-item:hover {
  box-shadow: var(--shadow-md);
  transform: translateY(-2px);
}

.integration-item__logo {
  width: 3rem;
  height: 3rem;
  border-radius: var(--radius-md);
  overflow: hidden;
  display: flex;
  align-items: center;
  justify-content: center;
}

.integration-item__name {
  font-size: var(--font-size-sm);
  font-weight: 700;
  color: var(--color-text);
}

.integration-item__desc {
  font-size: var(--font-size-xs);
  color: var(--color-text-muted);
}

/* ==========================================================================
   PRICING
   ========================================================================== */
.pricing {
  padding: var(--space-3xl) var(--space-md);
  background-color: var(--color-background);
  border-top: 1px solid var(--color-border);
}

.pricing-layout {
  display: flex;
  flex-direction: column;
  gap: var(--space-lg);
  max-width: 860px;
  margin-inline: auto;
  align-items: flex-start;
}

.pricing-card {
  background: var(--color-surface);
  border: 2px solid var(--color-border);
  border-radius: var(--radius-xl);
  padding: var(--space-xl);
  position: relative;
  width: 100%;
}

.pricing-card--featured {
  border-color: var(--color-accent);
  box-shadow: var(--shadow-lg);
}

.pricing-card__badge {
  position: absolute;
  top: -0.875rem;
  left: var(--space-xl);
  background: var(--color-accent);
  color: var(--color-text-inverse);
  font-size: var(--font-size-xs);
  font-weight: 700;
  letter-spacing: 0.05em;
  text-transform: uppercase;
  padding: 0.25rem 0.875rem;
  border-radius: var(--radius-full);
}

.pricing-card__header {
  margin-bottom: var(--space-lg);
}

.pricing-card__name {
  font-size: var(--font-size-xl);
  font-weight: 800;
  color: var(--color-primary);
  margin-bottom: var(--space-xs);
}

.pricing-card__tagline {
  font-size: var(--font-size-sm);
  color: var(--color-text-muted);
}

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

.pricing-card__currency {
  font-size: var(--font-size-xl);
  font-weight: 700;
  color: var(--color-text-muted);
  padding-top: var(--space-sm);
}

.pricing-card__amount {
  font-size: var(--font-size-5xl);
  font-weight: 900;
  color: var(--color-text);
  line-height: 1;
  font-variant-numeric: tabular-nums;
}

.pricing-card__period {
  font-size: var(--font-size-sm);
  color: var(--color-text-muted);
  line-height: 1.4;
  padding-top: var(--space-sm);
}

.pricing-card__period small {
  display: block;
  font-size: var(--font-size-xs);
}

.pricing-card__renewal {
  font-size: var(--font-size-sm);
  color: var(--color-text-muted);
  margin-bottom: var(--space-lg);
}

.pricing-card__divider {
  border: none;
  border-top: 1px solid var(--color-border-light);
  margin: var(--space-lg) 0;
}

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

.pricing-card__features li {
  display: flex;
  align-items: flex-start;
  gap: var(--space-sm);
  font-size: var(--font-size-sm);
  color: var(--color-text);
  line-height: 1.5;
}

.pricing-card__check {
  color: var(--color-accent);
  font-weight: 700;
  flex-shrink: 0;
  margin-top: 1px;
}

.pricing-card__note {
  font-size: var(--font-size-xs);
  color: var(--color-text-muted);
  text-align: center;
  margin-top: var(--space-md);
}

/* Pricing aside panel */
.pricing-aside {
  background: linear-gradient(135deg, var(--color-primary) 0%, var(--color-primary-light) 100%);
  color: var(--color-text-inverse);
  border-radius: var(--radius-xl);
  padding: var(--space-xl);
  width: 100%;
}

.pricing-aside__title {
  font-size: var(--font-size-xl);
  font-weight: 800;
  margin-bottom: var(--space-md);
}

.pricing-aside p {
  font-size: var(--font-size-sm);
  color: rgba(255, 255, 255, 0.8);
  line-height: 1.75;
  margin-bottom: var(--space-md);
}

.pricing-aside__savings {
  margin-top: var(--space-lg);
  padding-top: var(--space-lg);
  border-top: 1px solid rgba(255, 255, 255, 0.15);
  text-align: center;
}

.pricing-aside__savings-label {
  font-size: var(--font-size-sm);
  color: rgba(255, 255, 255, 0.7);
  margin-bottom: var(--space-xs);
  margin-top: 0;
}

.pricing-aside__savings-amount {
  font-size: var(--font-size-4xl);
  font-weight: 900;
  color: #4caf50;
  line-height: 1;
  margin: 0;
}

/* ==========================================================================
   CTA BANNER
   ========================================================================== */
.cta-banner {
  background: linear-gradient(135deg, var(--color-primary-dark) 0%, var(--color-primary) 100%);
  color: var(--color-text-inverse);
  text-align: center;
  padding: var(--space-3xl) var(--space-md);
  position: relative;
  overflow: hidden;
}

.cta-banner__title {
  font-size: var(--font-size-2xl);
  font-weight: 800;
  margin-bottom: var(--space-sm);
  letter-spacing: -0.5px;
}

.cta-banner__sub {
  font-size: var(--font-size-lg);
  color: rgba(255, 255, 255, 0.75);
  margin-bottom: var(--space-xl);
  max-width: 500px;
  margin-inline: auto;
  margin-bottom: var(--space-xl);
}

.cta-banner__note {
  margin-top: var(--space-md);
  font-size: var(--font-size-xs);
  color: rgba(255, 255, 255, 0.4);
}

/* ==========================================================================
   FOOTER
   ========================================================================== */
.site-footer {
  background-color: var(--color-primary-dark);
  color: rgba(255, 255, 255, 0.6);
  padding: var(--space-2xl) var(--space-md) var(--space-lg);
}

.site-footer__top {
  display: flex;
  flex-direction: column;
  gap: var(--space-xl);
  margin-bottom: var(--space-xl);
  padding-bottom: var(--space-xl);
  border-bottom: 1px solid rgba(255, 255, 255, 0.08);
}

.site-footer__logo {
  font-size: var(--font-size-xl);
  font-weight: 800;
  color: var(--color-text-inverse);
  display: inline-block;
  margin-bottom: var(--space-sm);
}

.site-footer__tagline {
  font-size: var(--font-size-sm);
  color: rgba(255, 255, 255, 0.5);
  max-width: 240px;
}

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

.site-footer__nav-group h4 {
  font-size: var(--font-size-xs);
  font-weight: 700;
  color: rgba(255, 255, 255, 0.5);
  text-transform: uppercase;
  letter-spacing: 0.1em;
  margin-bottom: var(--space-md);
}

.site-footer__nav-group ul {
  display: flex;
  flex-direction: column;
  gap: var(--space-sm);
}

.site-footer__nav-group a {
  font-size: var(--font-size-sm);
  color: rgba(255, 255, 255, 0.6);
  transition: color var(--transition-fast);
}

.site-footer__nav-group a:hover {
  color: var(--color-text-inverse);
}

.site-footer__bottom {
  display: flex;
  flex-direction: column;
  gap: var(--space-xs);
  text-align: center;
}

.site-footer__copy,
.site-footer__tech {
  font-size: var(--font-size-xs);
  color: rgba(255, 255, 255, 0.35);
}

/* ==========================================================================
   RESPONSIVE — Tablet (≥ 640px)
   ========================================================================== */
@media (min-width: 640px) {
  .hero__actions {
    flex-direction: row;
  }

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

/* ==========================================================================
   RESPONSIVE — Tablet (≥ 768px)
   ========================================================================== */
@media (min-width: 768px) {
  .container {
    padding-inline: var(--space-lg);
  }

  /* Nav: show links, hide burger */
  .nav__burger {
    display: none;
  }

  .nav__links {
    display: flex;
    flex-direction: row;
    position: static;
    background: transparent;
    padding: 0;
    box-shadow: none;
    flex: 1;
    gap: var(--space-lg);
  }

  .nav__links li {
    width: auto;
  }

  .nav__links a {
    padding: var(--space-xs) 0;
  }

  .nav__links a:hover {
    background: transparent;
  }

  .nav__cta {
    display: inline-flex;
    margin-left: auto;
  }

  /* Hero */
  .hero__headline {
    font-size: var(--font-size-5xl);
  }

  /* Section titles */
  .section__title {
    font-size: var(--font-size-3xl);
  }

  /* How it works: horizontal on tablet */
  .hiw-steps {
    flex-direction: row;
    align-items: flex-start;
    justify-content: center;
    gap: 0;
  }

  .hiw-step {
    max-width: none;
    flex: 1;
  }

  .hiw-step__connector {
    transform: none;
    margin: 0;
    margin-top: var(--space-3xl);
    flex-shrink: 0;
  }

  /* Pricing */
  .pricing-layout {
    flex-direction: row;
    align-items: stretch;
  }

  .pricing-card {
    flex: 1.1;
  }

  .pricing-aside {
    flex: 0.9;
  }

  /* Footer */
  .site-footer__top {
    flex-direction: row;
    justify-content: space-between;
  }

  .site-footer__bottom {
    flex-direction: row;
    justify-content: space-between;
    text-align: left;
  }
}

/* ==========================================================================
   RESPONSIVE — Desktop (≥ 1024px)
   ========================================================================== */
@media (min-width: 1024px) {
  /* Hero: two-column layout */
  .hero {
    display: grid;
    grid-template-columns: 1fr auto;
    gap: var(--space-2xl);
    align-items: center;
    padding: var(--space-3xl) var(--space-2xl);
  }

  .hero__content {
    max-width: none;
  }

  .hero__visual {
    display: block;
  }

  /* Features: 3 columns */
  .feature-grid {
    grid-template-columns: repeat(3, 1fr);
  }
}

/* ==========================================================================
   RESPONSIVE — Wide Desktop (≥ 1280px)
   ========================================================================== */
@media (min-width: 1280px) {
  .hero__headline {
    font-size: calc(var(--font-size-5xl) * 1.15);
  }
}

/* ==========================================================================
   Focus styles (accessibility)
   ========================================================================== */
:focus-visible {
  outline: 3px solid var(--color-accent);
  outline-offset: 3px;
  border-radius: var(--radius-sm);
}

/* ==========================================================================
   Reduced motion
   ========================================================================== */
@media (prefers-reduced-motion: reduce) {
  html {
    scroll-behavior: auto;
  }

  *,
  *::before,
  *::after {
    animation-duration: 0.01ms !important;
    transition-duration: 0.01ms !important;
  }
}