/* ========== DESIGN TOKENS ========== */
:root {
  /* Type scale */
  --text-xs: clamp(0.75rem, 0.7rem + 0.25vw, 0.875rem);
  --text-sm: clamp(0.875rem, 0.8rem + 0.35vw, 1rem);
  --text-base: clamp(1rem, 0.95rem + 0.25vw, 1.125rem);
  --text-lg: clamp(1.125rem, 1rem + 0.75vw, 1.5rem);
  --text-xl: clamp(1.5rem, 1.2rem + 1.25vw, 2.25rem);
  --text-2xl: clamp(2rem, 1.2rem + 2.5vw, 3.5rem);
  --text-3xl: clamp(2.5rem, 1rem + 4vw, 5rem);

  /* Spacing (4px base) */
  --space-1: 0.25rem;
  --space-2: 0.5rem;
  --space-3: 0.75rem;
  --space-4: 1rem;
  --space-5: 1.25rem;
  --space-6: 1.5rem;
  --space-8: 2rem;
  --space-10: 2.5rem;
  --space-12: 3rem;
  --space-16: 4rem;
  --space-20: 5rem;
  --space-24: 6rem;
  --space-32: 8rem;

  /* Radius */
  --radius-sm: 0.375rem;
  --radius-md: 0.5rem;
  --radius-lg: 0.75rem;
  --radius-xl: 1rem;
  --radius-2xl: 1.5rem;
  --radius-full: 9999px;

  /* Transitions */
  --transition-interactive: 180ms cubic-bezier(0.16, 1, 0.3, 1);

  /* Content widths */
  --content-narrow: 640px;
  --content-default: 960px;
  --content-wide: 1200px;

  /* Fonts */
  --font-body: 'General Sans', 'Inter', sans-serif;
  --font-display: 'Cabinet Grotesk', 'General Sans', sans-serif;
}

/* ========== ShiftScan Dark Theme (Default) ========== */
:root,
[data-theme='dark'] {
  --color-bg: #0D1117;
  --color-surface: #141B22;
  --color-surface-2: #1A2330;
  --color-surface-offset: #111820;
  --color-surface-offset-2: #1E2A38;
  --color-surface-dynamic: #243040;
  --color-divider: #1E2A38;
  --color-border: #2A3545;
  --color-text: #E2E8F0;
  --color-text-muted: #8B9AB5;
  --color-text-faint: #4A5568;
  --color-text-inverse: #0D1117;

  /* Primary Accent — Teal/Mint matching the app */
  --color-primary: #2DD4A8;
  --color-primary-hover: #38E8B8;
  --color-primary-active: #20C098;
  --color-primary-highlight: rgba(45, 212, 168, 0.12);
  --color-primary-glow: rgba(45, 212, 168, 0.15);

  /* Semantic */
  --color-success: #2DD4A8;
  --color-error: #F87171;
  --color-warning: #FBBF24;

  /* Shadows */
  --shadow-sm: 0 1px 2px rgba(0, 0, 0, 0.3);
  --shadow-md: 0 4px 12px rgba(0, 0, 0, 0.4);
  --shadow-lg: 0 12px 32px rgba(0, 0, 0, 0.5);
  --shadow-glow: 0 0 40px rgba(45, 212, 168, 0.15);
}

/* ========== Light Theme ========== */
[data-theme='light'] {
  --color-bg: #F0F4F8;
  --color-surface: #FFFFFF;
  --color-surface-2: #F7FAFC;
  --color-surface-offset: #EDF2F7;
  --color-surface-offset-2: #E2E8F0;
  --color-surface-dynamic: #CBD5E0;
  --color-divider: #E2E8F0;
  --color-border: #CBD5E0;
  --color-text: #1A202C;
  --color-text-muted: #4A5568;
  --color-text-faint: #A0AEC0;
  --color-text-inverse: #F7FAFC;

  --color-primary: #0D9373;
  --color-primary-hover: #0B7D63;
  --color-primary-active: #096B55;
  --color-primary-highlight: rgba(13, 147, 115, 0.1);
  --color-primary-glow: rgba(13, 147, 115, 0.08);

  --color-success: #0D9373;
  --color-error: #E53E3E;
  --color-warning: #D69E2E;

  --shadow-sm: 0 1px 2px rgba(0, 0, 0, 0.06);
  --shadow-md: 0 4px 12px rgba(0, 0, 0, 0.08);
  --shadow-lg: 0 12px 32px rgba(0, 0, 0, 0.12);
  --shadow-glow: 0 0 40px rgba(13, 147, 115, 0.08);
}

@media (prefers-color-scheme: light) {
  :root:not([data-theme]) {
    --color-bg: #F0F4F8;
    --color-surface: #FFFFFF;
    --color-surface-2: #F7FAFC;
    --color-surface-offset: #EDF2F7;
    --color-surface-offset-2: #E2E8F0;
    --color-surface-dynamic: #CBD5E0;
    --color-divider: #E2E8F0;
    --color-border: #CBD5E0;
    --color-text: #1A202C;
    --color-text-muted: #4A5568;
    --color-text-faint: #A0AEC0;
    --color-text-inverse: #F7FAFC;
    --color-primary: #0D9373;
    --color-primary-hover: #0B7D63;
    --color-primary-active: #096B55;
    --color-primary-highlight: rgba(13, 147, 115, 0.1);
    --color-primary-glow: rgba(13, 147, 115, 0.08);
    --color-success: #0D9373;
    --color-error: #E53E3E;
    --color-warning: #D69E2E;
    --shadow-sm: 0 1px 2px rgba(0, 0, 0, 0.06);
    --shadow-md: 0 4px 12px rgba(0, 0, 0, 0.08);
    --shadow-lg: 0 12px 32px rgba(0, 0, 0, 0.12);
    --shadow-glow: 0 0 40px rgba(13, 147, 115, 0.08);
  }
}

/* ========== LAYOUT ========== */
.container {
  width: 100%;
  max-width: var(--content-wide);
  margin-inline: auto;
  padding-inline: var(--space-6);
}

.container--narrow {
  max-width: var(--content-default);
}

/* ========== HEADER ========== */
.header {
  position: sticky;
  top: 0;
  z-index: 50;
  background: oklch(from var(--color-bg) l c h / 0.85);
  backdrop-filter: blur(16px);
  -webkit-backdrop-filter: blur(16px);
  border-bottom: 1px solid var(--color-divider);
  transition: box-shadow 0.3s cubic-bezier(0.16, 1, 0.3, 1);
}

.header--scrolled {
  box-shadow: var(--shadow-md);
}

.header__inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding-block: var(--space-4);
}

.header__logo {
  display: flex;
  align-items: center;
  gap: var(--space-3);
  text-decoration: none;
  color: var(--color-text);
}

.header__logo-text {
  font-family: var(--font-display);
  font-weight: 700;
  font-size: var(--text-lg);
  letter-spacing: -0.02em;
}

.header__nav {
  display: flex;
  align-items: center;
  gap: var(--space-6);
}

.header__nav a {
  font-size: var(--text-sm);
  color: var(--color-text-muted);
  text-decoration: none;
  font-weight: 500;
  position: relative;
}

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

.header__nav a::after {
  content: '';
  position: absolute;
  bottom: -4px;
  left: 0;
  width: 0;
  height: 2px;
  background: var(--color-primary);
  border-radius: var(--radius-full);
  transition: width var(--transition-interactive);
}

.header__nav a:hover::after {
  width: 100%;
}

.theme-toggle {
  padding: var(--space-2);
  border-radius: var(--radius-md);
  color: var(--color-text-muted);
  display: flex;
  align-items: center;
  justify-content: center;
}

.theme-toggle:hover {
  color: var(--color-primary);
  background: var(--color-primary-highlight);
}

/* Mobile nav toggle */
.nav-toggle {
  display: none;
  padding: var(--space-2);
  color: var(--color-text-muted);
}

@media (max-width: 768px) {
  .nav-toggle {
    display: flex;
    align-items: center;
  }
  .header__nav {
    display: none;
    position: absolute;
    top: 100%;
    left: 0;
    right: 0;
    background: var(--color-surface);
    border-bottom: 1px solid var(--color-divider);
    flex-direction: column;
    padding: var(--space-6);
    gap: var(--space-4);
  }
  .header__nav.open {
    display: flex;
  }
}

/* ========== HERO ========== */
.hero {
  padding-block: clamp(var(--space-16), 12vw, var(--space-32));
  text-align: center;
  position: relative;
  overflow: hidden;
}

.hero::before {
  content: '';
  position: absolute;
  top: -40%;
  left: 50%;
  transform: translateX(-50%);
  width: 600px;
  height: 600px;
  background: radial-gradient(circle, var(--color-primary-glow) 0%, transparent 70%);
  border-radius: 50%;
  pointer-events: none;
  z-index: 0;
}

.hero__content {
  position: relative;
  z-index: 1;
  max-width: 720px;
  margin-inline: auto;
}

.hero__badge {
  display: inline-flex;
  align-items: center;
  gap: var(--space-2);
  padding: var(--space-1) var(--space-4);
  background: var(--color-primary-highlight);
  border: 1px solid rgba(45, 212, 168, 0.2);
  border-radius: var(--radius-full);
  font-size: var(--text-xs);
  color: var(--color-primary);
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.05em;
  margin-bottom: var(--space-6);
}

.hero__title {
  font-family: var(--font-display);
  font-size: var(--text-2xl);
  font-weight: 800;
  color: var(--color-text);
  margin-bottom: var(--space-6);
  letter-spacing: -0.03em;
}

.hero__title-accent {
  color: var(--color-primary);
}

.hero__subtitle {
  font-size: var(--text-base);
  color: var(--color-text-muted);
  max-width: 540px;
  margin-inline: auto;
  margin-bottom: var(--space-8);
  line-height: 1.7;
}

.hero__cta-group {
  display: flex;
  gap: var(--space-4);
  justify-content: center;
  flex-wrap: wrap;
}

/* ========== BUTTONS ========== */
.btn {
  display: inline-flex;
  align-items: center;
  gap: var(--space-2);
  padding: var(--space-3) var(--space-6);
  border-radius: var(--radius-lg);
  font-size: var(--text-sm);
  font-weight: 600;
  text-decoration: none;
  cursor: pointer;
  border: none;
  white-space: nowrap;
}

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

.btn--primary:hover {
  background: var(--color-primary-hover);
  box-shadow: var(--shadow-glow);
  transform: translateY(-1px);
}

.btn--secondary {
  background: var(--color-surface-2);
  color: var(--color-text);
  border: 1px solid var(--color-border);
}

.btn--secondary:hover {
  border-color: var(--color-primary);
  color: var(--color-primary);
}

/* ========== FEATURES ========== */
.features {
  padding-block: clamp(var(--space-12), 8vw, var(--space-24));
}

.section-label {
  display: inline-flex;
  align-items: center;
  gap: var(--space-2);
  font-size: var(--text-xs);
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.08em;
  color: var(--color-primary);
  margin-bottom: var(--space-4);
}

.section-title {
  font-family: var(--font-display);
  font-size: var(--text-xl);
  font-weight: 700;
  color: var(--color-text);
  margin-bottom: var(--space-4);
  letter-spacing: -0.02em;
}

.section-desc {
  font-size: var(--text-base);
  color: var(--color-text-muted);
  max-width: 560px;
  margin-bottom: var(--space-12);
}

.features__grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
  gap: var(--space-6);
}

.feature-card {
  background: var(--color-surface);
  border: 1px solid var(--color-divider);
  border-radius: var(--radius-xl);
  padding: var(--space-8);
  transition: border-color var(--transition-interactive),
    box-shadow var(--transition-interactive),
    transform var(--transition-interactive);
}

.feature-card:hover {
  border-color: var(--color-primary);
  box-shadow: var(--shadow-glow);
  transform: translateY(-2px);
}

.feature-card__icon {
  width: 48px;
  height: 48px;
  display: flex;
  align-items: center;
  justify-content: center;
  background: var(--color-primary-highlight);
  border-radius: var(--radius-lg);
  margin-bottom: var(--space-5);
  color: var(--color-primary);
}

.feature-card__title {
  font-family: var(--font-display);
  font-size: var(--text-lg);
  font-weight: 700;
  color: var(--color-text);
  margin-bottom: var(--space-3);
}

.feature-card__desc {
  font-size: var(--text-sm);
  color: var(--color-text-muted);
  line-height: 1.6;
}

/* ========== HOW IT WORKS ========== */
.how-it-works {
  padding-block: clamp(var(--space-12), 8vw, var(--space-24));
  background: var(--color-surface);
}

.steps {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(240px, 1fr));
  gap: var(--space-8);
  counter-reset: step;
}

.step {
  counter-increment: step;
  position: relative;
  display: grid;
  grid-template-columns: 48px 1fr;
  grid-template-rows: auto auto;
  gap: 0 var(--space-4);
}

.step::before {
  content: counter(step);
  grid-row: 1 / -1;
  grid-column: 1;
  width: 44px;
  height: 44px;
  display: flex;
  align-items: center;
  justify-content: center;
  background: var(--color-primary);
  color: var(--color-text-inverse);
  font-family: var(--font-display);
  font-weight: 700;
  font-size: var(--text-sm);
  border-radius: var(--radius-full);
  flex-shrink: 0;
}

.step__title {
  grid-column: 2;
  font-family: var(--font-display);
  font-size: var(--text-lg);
  font-weight: 700;
  margin-bottom: var(--space-1);
  color: var(--color-text);
  align-self: end;
}

.step__desc {
  grid-column: 2;
  font-size: var(--text-sm);
  color: var(--color-text-muted);
  line-height: 1.6;
  align-self: start;
}

/* ========== PRIVACY ========== */
.privacy-section {
  padding-block: clamp(var(--space-12), 8vw, var(--space-24));
}

.privacy-card {
  background: var(--color-surface);
  border: 1px solid var(--color-divider);
  border-radius: var(--radius-2xl);
  padding: clamp(var(--space-8), 4vw, var(--space-12));
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: var(--space-10);
  align-items: center;
}

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

.privacy-card__icon {
  width: 64px;
  height: 64px;
  display: flex;
  align-items: center;
  justify-content: center;
  background: var(--color-primary-highlight);
  border-radius: var(--radius-xl);
  margin-bottom: var(--space-5);
  color: var(--color-primary);
}

.privacy-features {
  display: flex;
  flex-direction: column;
  gap: var(--space-4);
}

.privacy-feature {
  display: flex;
  align-items: flex-start;
  gap: var(--space-3);
}

.privacy-feature__check {
  flex-shrink: 0;
  width: 24px;
  height: 24px;
  display: flex;
  align-items: center;
  justify-content: center;
  background: var(--color-primary-highlight);
  border-radius: var(--radius-full);
  color: var(--color-primary);
  margin-top: 2px;
}

.privacy-feature__text {
  font-size: var(--text-sm);
  color: var(--color-text-muted);
}

/* ========== CTA SECTION ========== */
.cta-section {
  padding-block: clamp(var(--space-12), 8vw, var(--space-24));
}

.cta-box {
  text-align: center;
  padding: clamp(var(--space-10), 5vw, var(--space-16));
  background: linear-gradient(
    135deg,
    var(--color-surface-2) 0%,
    var(--color-surface) 100%
  );
  border: 1px solid var(--color-divider);
  border-radius: var(--radius-2xl);
  position: relative;
  overflow: hidden;
}

.cta-box::before {
  content: '';
  position: absolute;
  top: -50%;
  right: -20%;
  width: 400px;
  height: 400px;
  background: radial-gradient(circle, var(--color-primary-glow) 0%, transparent 70%);
  pointer-events: none;
}

.cta-box__title {
  font-family: var(--font-display);
  font-size: var(--text-xl);
  font-weight: 700;
  color: var(--color-text);
  margin-bottom: var(--space-4);
  position: relative;
}

.cta-box__desc {
  font-size: var(--text-base);
  color: var(--color-text-muted);
  margin-bottom: var(--space-8);
  max-width: 480px;
  margin-inline: auto;
  position: relative;
}

/* ========== IMPRESSUM ========== */
.impressum {
  padding-block: clamp(var(--space-12), 8vw, var(--space-24));
  background: var(--color-surface);
}

.impressum__content {
  max-width: var(--content-narrow);
}

.impressum__block {
  margin-bottom: var(--space-6);
}

.impressum__block h3 {
  font-family: var(--font-display);
  font-size: var(--text-lg);
  font-weight: 700;
  color: var(--color-text);
  margin-bottom: var(--space-2);
}

.impressum__block p,
.impressum__block address {
  font-size: var(--text-sm);
  color: var(--color-text-muted);
  font-style: normal;
  line-height: 1.7;
}

.impressum__block a {
  color: var(--color-primary);
  text-decoration: none;
}

.impressum__block a:hover {
  text-decoration: underline;
}

/* ========== FOOTER ========== */
.footer {
  padding-block: var(--space-8);
  border-top: 1px solid var(--color-divider);
}

.footer__inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  flex-wrap: wrap;
  gap: var(--space-4);
}

.footer__copy {
  font-size: var(--text-xs);
  color: var(--color-text-faint);
}

.footer__links {
  display: flex;
  gap: var(--space-6);
}

.footer__links a {
  font-size: var(--text-xs);
  color: var(--color-text-faint);
  text-decoration: none;
}

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

.footer__social {
  display: flex;
  justify-content: center;
  padding-bottom: var(--space-6);
  margin-bottom: var(--space-6);
  border-bottom: 1px solid var(--color-divider);
}

.footer__instagram {
  gap: var(--space-3);
}

.footer__instagram:hover svg {
  color: var(--color-primary);
}

/* ========== SCROLL ANIMATIONS ========== */
.fade-in {
  opacity: 0;
  transform: translateY(20px);
  transition: opacity 0.6s cubic-bezier(0.16, 1, 0.3, 1),
    transform 0.6s cubic-bezier(0.16, 1, 0.3, 1);
}

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

/* ========== APP STORE BADGE ========== */
.app-store-badge {
  display: inline-flex;
  align-items: center;
  gap: var(--space-3);
  padding: var(--space-3) var(--space-5);
  background: var(--color-surface-2);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-lg);
  text-decoration: none;
  color: var(--color-text);
  font-size: var(--text-sm);
  font-weight: 600;
  transition: all var(--transition-interactive);
}

.app-store-badge:hover {
  border-color: var(--color-primary);
  box-shadow: var(--shadow-glow);
}

.app-store-badge svg {
  flex-shrink: 0;
}