/* ============================================
   Loop Off - Design System & Styles
   ============================================ */

/* --- CSS Variables --- */
:root {
  /* Colors */
  --color-bg: #0D0D0F;
  --color-surface: #18181B;
  --color-border: #27272A;
  --color-text: #FAFAFA;
  --color-text-muted: #A1A1AA;
  --color-accent: #A78BFA;
  --color-accent-hover: #C4B5FD;
  
  /* Typography */
  --font-family: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', sans-serif;
  --font-size-xs: 0.875rem;
  --font-size-sm: 1rem;
  --font-size-md: 1.125rem;
  --font-size-lg: 1.5rem;
  --font-size-xl: 2rem;
  --font-size-2xl: 3rem;
  
  /* Spacing */
  --space-1: 0.25rem;
  --space-2: 0.5rem;
  --space-3: 0.75rem;
  --space-4: 1rem;
  --space-6: 1.5rem;
  --space-8: 2rem;
  --space-12: 3rem;
  --space-16: 4rem;
  --space-20: 5rem;
  
  /* Layout */
  --container-max: 1120px;
  --radius-sm: 6px;
  --radius-md: 8px;
  --radius-lg: 12px;
  
  /* Transitions */
  --transition-fast: 150ms ease;
  --transition-base: 200ms ease;
}

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

html {
  scroll-behavior: smooth;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}

body {
  font-family: var(--font-family);
  font-size: var(--font-size-sm);
  line-height: 1.6;
  color: var(--color-text);
  background-color: var(--color-bg);
}

a {
  color: var(--color-accent);
  text-decoration: none;
  transition: color var(--transition-fast);
}

a:hover {
  color: var(--color-accent-hover);
  text-decoration: underline;
}

a:focus-visible {
  outline: 2px solid var(--color-accent);
  outline-offset: 2px;
}

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

ul {
  list-style: none;
}

/* --- Typography --- */
h1, h2, h3, h4 {
  font-weight: 600;
  line-height: 1.2;
  letter-spacing: -0.02em;
}

h1 {
  font-size: var(--font-size-2xl);
  font-weight: 700;
}

h2 {
  font-size: var(--font-size-xl);
  margin-bottom: var(--space-6);
}

h3 {
  font-size: var(--font-size-lg);
  margin-bottom: var(--space-4);
}

p {
  color: var(--color-text-muted);
}

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

/* --- Layout --- */
.container {
  width: 100%;
  max-width: var(--container-max);
  margin: 0 auto;
  padding: 0 var(--space-6);
}

section {
  padding: var(--space-20) 0;
}

@media (max-width: 768px) {
  section {
    padding: var(--space-12) 0;
  }
}

/* --- Header --- */
.header {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  z-index: 100;
  background: rgba(13, 13, 15, 0.8);
  backdrop-filter: blur(12px);
  border-bottom: 1px solid var(--color-border);
}

.header .container {
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: 64px;
}

.logo {
  font-size: var(--font-size-md);
  font-weight: 700;
  color: var(--color-text);
  text-decoration: none;
}

.logo:hover {
  color: var(--color-text);
  text-decoration: none;
}

.nav {
  display: flex;
  align-items: center;
  gap: var(--space-8);
}

.nav-link {
  font-size: var(--font-size-xs);
  color: var(--color-text-muted);
  transition: color var(--transition-fast);
}

.nav-link:hover {
  color: var(--color-text);
  text-decoration: none;
}

.nav-toggle {
  display: none;
  background: none;
  border: none;
  color: var(--color-text);
  cursor: pointer;
  padding: var(--space-2);
}

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

@media (max-width: 768px) {
  .nav {
    position: fixed;
    top: 64px;
    left: 0;
    right: 0;
    bottom: 0;
    flex-direction: column;
    justify-content: flex-start;
    padding-top: var(--space-8);
    gap: var(--space-6);
    background: var(--color-bg);
    border-top: 1px solid var(--color-border);
    transform: translateX(100%);
    transition: transform var(--transition-base);
  }
  
  .nav.is-open {
    transform: translateX(0);
  }
  
  .nav-toggle {
    display: block;
  }
  
  .nav-link {
    font-size: var(--font-size-md);
  }
}

/* --- Buttons --- */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: var(--space-2);
  padding: var(--space-3) var(--space-6);
  font-family: inherit;
  font-size: var(--font-size-xs);
  font-weight: 500;
  color: var(--color-bg);
  background: var(--color-accent);
  border: none;
  border-radius: var(--radius-md);
  cursor: pointer;
  transition: all var(--transition-fast);
  text-decoration: none;
}

.btn:hover {
  background: var(--color-accent-hover);
  color: var(--color-bg);
  text-decoration: none;
  transform: translateY(-1px);
}

.btn:focus-visible {
  outline: 2px solid var(--color-accent);
  outline-offset: 2px;
}

.btn-lg {
  padding: var(--space-4) var(--space-8);
  font-size: var(--font-size-sm);
}

.btn-outline {
  background: transparent;
  color: var(--color-text);
  border: 1px solid var(--color-border);
}

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

/* App Store Badge */
.app-store-badge {
  display: inline-block;
  transition: transform var(--transition-fast), opacity var(--transition-fast);
}

.app-store-badge:hover {
  transform: translateY(-2px);
  opacity: 0.9;
}

.app-store-badge img {
  height: 48px;
  width: auto;
}

/* --- Hero Section --- */
.hero {
  min-height: 100vh;
  display: flex;
  align-items: center;
  padding-top: 64px;
  text-align: center;
}

.hero .container {
  max-width: 800px;
}

.hero h1 {
  margin-bottom: var(--space-6);
}

.hero-subtitle {
  font-size: var(--font-size-md);
  color: var(--color-text-muted);
  margin-bottom: var(--space-8);
  max-width: 600px;
  margin-left: auto;
  margin-right: auto;
}

.hero-cta {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: var(--space-4);
}

/* --- How It Works Section --- */
.steps {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: var(--space-8);
  margin-top: var(--space-12);
}

.step {
  text-align: center;
}

.step-number {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 48px;
  height: 48px;
  font-size: var(--font-size-lg);
  font-weight: 600;
  color: var(--color-accent);
  background: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: 50%;
  margin-bottom: var(--space-4);
}

.step h3 {
  color: var(--color-text);
  margin-bottom: var(--space-2);
}

.step p {
  font-size: var(--font-size-xs);
}

@media (max-width: 768px) {
  .steps {
    grid-template-columns: 1fr;
    gap: var(--space-8);
  }
}

/* --- Features Section --- */
.features {
  background: var(--color-surface);
  border-top: 1px solid var(--color-border);
  border-bottom: 1px solid var(--color-border);
}

.features-grid {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: var(--space-6);
  margin-top: var(--space-12);
}

.feature-card {
  padding: var(--space-6);
  background: var(--color-bg);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-lg);
  transition: border-color var(--transition-fast);
}

.feature-card:hover {
  border-color: var(--color-text-muted);
}

.feature-icon {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 40px;
  height: 40px;
  color: var(--color-accent);
  background: rgba(167, 139, 250, 0.1);
  border-radius: var(--radius-md);
  margin-bottom: var(--space-4);
}

.feature-icon svg {
  width: 20px;
  height: 20px;
}

.feature-card h3 {
  font-size: var(--font-size-sm);
  margin-bottom: var(--space-2);
}

.feature-card p {
  font-size: var(--font-size-xs);
}

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

/* --- Privacy Section --- */
.privacy-section {
  text-align: center;
}

.privacy-section .container {
  max-width: 720px;
}

.privacy-list {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: var(--space-4);
  margin: var(--space-8) 0;
  text-align: left;
}

.privacy-item {
  display: flex;
  align-items: flex-start;
  gap: var(--space-3);
  padding: var(--space-4);
  background: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-md);
}

.privacy-item svg {
  flex-shrink: 0;
  width: 20px;
  height: 20px;
  color: var(--color-accent);
  margin-top: 2px;
}

.privacy-item span {
  font-size: var(--font-size-xs);
  color: var(--color-text);
}

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

/* --- FAQ Section --- */
.faq-list {
  max-width: 720px;
  margin: var(--space-12) auto 0;
}

.faq-item {
  border-bottom: 1px solid var(--color-border);
}

.faq-item:first-child {
  border-top: 1px solid var(--color-border);
}

.faq-question {
  width: 100%;
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: var(--space-6) 0;
  font-family: inherit;
  font-size: var(--font-size-sm);
  font-weight: 500;
  color: var(--color-text);
  text-align: left;
  background: none;
  border: none;
  cursor: pointer;
  transition: color var(--transition-fast);
}

.faq-question:hover {
  color: var(--color-accent);
}

.faq-question svg {
  flex-shrink: 0;
  width: 20px;
  height: 20px;
  color: var(--color-text-muted);
  transition: transform var(--transition-base);
}

.faq-item.is-open .faq-question svg {
  transform: rotate(45deg);
}

.faq-answer {
  max-height: 0;
  overflow: hidden;
  transition: max-height var(--transition-base);
}

.faq-item.is-open .faq-answer {
  max-height: 500px;
}

.faq-answer p {
  padding-bottom: var(--space-6);
  font-size: var(--font-size-xs);
}

/* --- CTA Section --- */
.cta-section {
  text-align: center;
  background: linear-gradient(180deg, var(--color-surface) 0%, var(--color-bg) 100%);
  border-top: 1px solid var(--color-border);
}

.cta-section .container {
  max-width: 600px;
}

.cta-section h2 {
  margin-bottom: var(--space-4);
}

.cta-section p {
  margin-bottom: var(--space-8);
}

/* --- Footer --- */
.footer {
  padding: var(--space-12) 0;
  border-top: 1px solid var(--color-border);
}

.footer .container {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: var(--space-6);
  text-align: center;
}

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

.footer-links a {
  font-size: var(--font-size-xs);
  color: var(--color-text-muted);
}

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

.footer-copy {
  font-size: var(--font-size-xs);
  color: var(--color-text-muted);
}

.footer-tagline {
  font-size: var(--font-size-xs);
  font-style: italic;
  color: var(--color-text-muted);
}

/* --- Legal Pages --- */
.legal-page {
  padding-top: calc(64px + var(--space-12));
  padding-bottom: var(--space-16);
}

.legal-page .container {
  max-width: 720px;
}

.legal-page h1 {
  margin-bottom: var(--space-2);
}

.legal-date {
  font-size: var(--font-size-xs);
  color: var(--color-text-muted);
  margin-bottom: var(--space-8);
}

.legal-content h2 {
  font-size: var(--font-size-lg);
  margin-top: var(--space-8);
  margin-bottom: var(--space-4);
}

.legal-content h3 {
  font-size: var(--font-size-sm);
  margin-top: var(--space-6);
  margin-bottom: var(--space-3);
}

.legal-content p {
  margin-bottom: var(--space-4);
}

.legal-content ul {
  margin-bottom: var(--space-4);
  padding-left: var(--space-6);
}

.legal-content li {
  position: relative;
  margin-bottom: var(--space-2);
  color: var(--color-text-muted);
}

.legal-content li::before {
  content: "•";
  position: absolute;
  left: calc(-1 * var(--space-4));
  color: var(--color-accent);
}

.legal-content a {
  color: var(--color-accent);
}

.legal-content strong {
  color: var(--color-text);
  font-weight: 500;
}

/* --- Section Headers --- */
.section-header {
  text-align: center;
  margin-bottom: var(--space-12);
}

.section-header p {
  max-width: 600px;
  margin: 0 auto;
}

/* --- Utilities --- */
.text-center {
  text-align: center;
}

.sr-only {
  position: absolute;
  width: 1px;
  height: 1px;
  padding: 0;
  margin: -1px;
  overflow: hidden;
  clip: rect(0, 0, 0, 0);
  white-space: nowrap;
  border-width: 0;
}

/* --- Print Styles --- */
@media print {
  .header,
  .footer,
  .nav-toggle {
    display: none;
  }
  
  body {
    background: white;
    color: black;
  }
  
  .legal-page {
    padding-top: 0;
  }
}