/* ═══════════════════════════════════════════════
   Snap That Piece — Landing Page Styles
   Light, clean, mobile-first.
   ═══════════════════════════════════════════════ */

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

:root {
  --color-bg: #fafaf9;
  --color-surface: #ffffff;
  --color-border: #e8e5e1;
  --color-border-light: #f0eeeb;
  --color-text: #1a1a1a;
  --color-text-secondary: #5c5c5c;
  --color-text-muted: #8a8a8a;
  --color-accent: #2d6a4f;
  --color-accent-light: #d8f3dc;
  --color-accent-dark: #1b4332;
  --font-sans: -apple-system, BlinkMacSystemFont, "Segoe UI", system-ui, sans-serif;
  --font-serif: Georgia, "Times New Roman", serif;
  --container-max: 1080px;
  --container-narrow: 720px;
  --space-xs: 4px;
  --space-sm: 8px;
  --space-md: 16px;
  --space-lg: 24px;
  --space-xl: 40px;
  --space-2xl: 64px;
  --space-3xl: 96px;
  --radius-sm: 8px;
  --radius-md: 12px;
  --radius-lg: 16px;
  --radius-full: 9999px;
}

html {
  font-size: 16px;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
  scroll-behavior: smooth;
}

body {
  font-family: var(--font-sans);
  background-color: var(--color-bg);
  color: var(--color-text);
  line-height: 1.6;
  min-height: 100vh;
}

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

a {
  color: var(--color-accent);
  text-decoration: none;
  transition: color 0.15s ease;
}

a:hover {
  color: var(--color-accent-dark);
}

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

/* ── Buttons ── */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: var(--space-sm);
  padding: 12px 28px;
  font-size: 0.938rem;
  font-weight: 600;
  line-height: 1.4;
  border-radius: var(--radius-full);
  border: 1.5px solid transparent;
  cursor: pointer;
  transition: all 0.2s ease;
  text-decoration: none;
  white-space: nowrap;
}

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

.btn-primary:hover {
  background: #333;
  color: var(--color-surface);
  border-color: #333;
}

.btn-secondary {
  background: transparent;
  color: var(--color-text);
  border-color: var(--color-border);
}

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

.btn-lg {
  padding: 16px 36px;
  font-size: 1rem;
}

/* ═══════════════════════════════════════════════
   Header
   ═══════════════════════════════════════════════ */
.site-header {
  position: sticky;
  top: 0;
  z-index: 100;
  background: rgba(255, 255, 255, 0.92);
  backdrop-filter: blur(12px);
  -webkit-backdrop-filter: blur(12px);
  border-bottom: 1px solid var(--color-border-light);
}

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

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

.logo:hover {
  color: var(--color-text);
}

.logo-icon {
  flex-shrink: 0;
  border-radius: 6px;
}

.logo-text {
  font-weight: 700;
  font-size: 1.05rem;
  letter-spacing: -0.01em;
}

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

.header-nav a {
  font-size: 0.875rem;
  font-weight: 500;
  color: var(--color-text-secondary);
  text-decoration: none;
  transition: color 0.15s ease;
}

.header-nav a:hover {
  color: var(--color-text);
}

/* Mobile menu toggle */
.menu-toggle {
  display: none;
  background: none;
  border: none;
  cursor: pointer;
  color: var(--color-text);
  padding: var(--space-sm);
}

/* Mobile nav overlay */
.mobile-nav {
  display: grid;
  grid-template-rows: 0fr;
  transition: grid-template-rows 0.3s ease;
  background: var(--color-bg);
  overflow: hidden;
}

.mobile-nav > nav {
  min-height: 0;
  overflow: hidden;
  display: flex;
  flex-direction: column;
}

.mobile-nav.is-open {
  grid-template-rows: 1fr;
  border-bottom: 1px solid var(--color-border-light);
}

.mobile-nav nav a {
  padding: 12px var(--space-lg);
  font-size: 1rem;
  font-weight: 500;
  color: var(--color-text-secondary);
  border-bottom: 1px solid var(--color-border-light);
  text-decoration: none;
}

.mobile-nav nav a:first-child {
  padding-top: var(--space-md);
}

.mobile-nav nav a:last-child {
  border-bottom: none;
  padding-bottom: var(--space-lg);
}

.mobile-nav nav a:hover {
  color: var(--color-text);
}

@media (max-width: 640px) {
  .header-nav {
    display: none;
  }
  .menu-toggle {
    display: block;
  }
}

/* ═══════════════════════════════════════════════
   Hero
   ═══════════════════════════════════════════════ */
.hero {
  padding: var(--space-3xl) 0 var(--space-2xl);
  text-align: center;
}

.hero-inner {
  max-width: var(--container-narrow);
  margin: 0 auto;
}

.hero-badge {
  display: inline-flex;
  align-items: center;
  gap: var(--space-sm);
  padding: 6px 18px;
  font-size: 0.8rem;
  font-weight: 600;
  letter-spacing: 0.04em;
  text-transform: uppercase;
  color: var(--color-accent-dark);
  background: var(--color-accent-light);
  border-radius: var(--radius-full);
  margin-bottom: var(--space-xl);
}

.hero h1 {
  font-size: clamp(2.25rem, 5vw, 3.5rem);
  font-weight: 800;
  line-height: 1.12;
  letter-spacing: -0.03em;
  margin-bottom: var(--space-lg);
  color: var(--color-text);
}

.hero-sub {
  font-size: clamp(1rem, 2.5vw, 1.2rem);
  line-height: 1.65;
  color: var(--color-text-secondary);
  max-width: 540px;
  margin: 0 auto var(--space-xl);
}

.hero-cta {
  display: flex;
  flex-wrap: wrap;
  gap: var(--space-md);
  justify-content: center;
  margin-bottom: var(--space-xl);
}

.hero-platforms {
  display: inline-flex;
  align-items: center;
  gap: var(--space-sm);
  font-size: 0.85rem;
  color: var(--color-text-muted);
}

/* ═══════════════════════════════════════════════
   Section headers
   ═══════════════════════════════════════════════ */
.section-header {
  text-align: center;
  max-width: var(--container-narrow);
  margin: 0 auto var(--space-2xl);
}

.section-header h2 {
  font-size: clamp(1.5rem, 3.5vw, 2.2rem);
  font-weight: 800;
  letter-spacing: -0.02em;
  margin-bottom: var(--space-sm);
}

.section-header p {
  font-size: 1.05rem;
  color: var(--color-text-secondary);
}

/* ═══════════════════════════════════════════════
   How It Works
   ═══════════════════════════════════════════════ */
.how-it-works {
  padding: var(--space-3xl) 0;
}

.value-props {
  max-width: 640px;
  margin: 0 auto;
  display: flex;
  flex-direction: column;
  gap: 0;
  position: relative;
}

/* vertical connector line between circles 1 and 3 */
.value-prop:not(:last-child)::after {
  content: "";
  position: absolute;
  left: 21px;
  top: 44px;
  bottom: -1px;
  width: 1px;
  background: var(--color-border);
}

.value-prop {
  display: flex;
  align-items: flex-start;
  gap: var(--space-lg);
  padding: var(--space-lg) 0;
  position: relative;
}

.value-prop-num {
  flex-shrink: 0;
  display: flex;
  align-items: center;
  justify-content: center;
  width: 44px;
  height: 44px;
  border-radius: 50%;
  background: var(--color-text);
  color: var(--color-surface);
  font-weight: 800;
  font-size: 1rem;
  position: relative;
  z-index: 1;
}

.value-prop-body h3 {
  font-size: 1.15rem;
  font-weight: 700;
  letter-spacing: -0.01em;
  margin-bottom: var(--space-xs);
  line-height: 1.3;
}

.value-prop-body p {
  font-size: 0.95rem;
  line-height: 1.65;
  color: var(--color-text-secondary);
}

@media (max-width: 640px) {
  .value-prop:not(:last-child)::after {
    left: 17px;
    top: 36px;
  }

  .value-prop-num {
    width: 36px;
    height: 36px;
    font-size: 0.875rem;
  }

  .value-prop {
    gap: var(--space-md);
  }
}

/* ═══════════════════════════════════════════════
   CTA Section
   ═══════════════════════════════════════════════ */
.cta-section {
  padding: var(--space-3xl) 0;
}

.cta-inner {
  text-align: center;
  max-width: var(--container-narrow);
  margin: 0 auto;
}

.ios-badge {
  display: inline-flex;
  align-items: center;
  gap: var(--space-md);
  padding: 12px 24px;
  background: var(--color-text);
  color: var(--color-surface);
  border-radius: var(--radius-md);
  margin-bottom: var(--space-xl);
  text-decoration: none;
}

.ios-badge-text {
  display: flex;
  flex-direction: column;
  text-align: left;
  line-height: 1.2;
}

.ios-badge-small {
  font-size: 0.65rem;
  font-weight: 400;
  letter-spacing: 0.02em;
  opacity: 0.85;
}

.ios-badge-large {
  font-size: 1.15rem;
  font-weight: 700;
  letter-spacing: -0.01em;
}

.cta-inner h2 {
  font-size: clamp(1.5rem, 3vw, 2rem);
  font-weight: 800;
  letter-spacing: -0.02em;
  margin-bottom: var(--space-sm);
}

.cta-inner p {
  font-size: 1.05rem;
  color: var(--color-text-secondary);
  margin-bottom: var(--space-xl);
  max-width: 480px;
  margin-left: auto;
  margin-right: auto;
}

/* ═══════════════════════════════════════════════
   404 Page
   ═══════════════════════════════════════════════ */
.error-page {
  padding: var(--space-3xl) 0;
  text-align: center;
  min-height: 60vh;
  display: flex;
  align-items: center;
}

.error-page .container {
  display: flex;
  flex-direction: column;
  align-items: center;
}

.error-board {
  width: 200px;
  height: 200px;
  margin-bottom: var(--space-xl);
  border-radius: var(--radius-md);
  overflow: hidden;
  box-shadow: 0 4px 24px rgba(0, 0, 0, 0.08);
  position: relative;
}

.error-grid {
  display: grid;
  grid-template-columns: repeat(8, 1fr);
  width: 100%;
  height: 100%;
}

.sq {
  display: flex;
  align-items: center;
  justify-content: center;
  aspect-ratio: 1;
  transition: background 0.3s ease;
}

.sq-l {
  background: #f0eeeb;
}

.sq-d {
  background: #c4b9a8;
}

.sq-l.sq-visited {
  background: #d8f3dc;
}

.sq-d.sq-visited {
  background: #95d5b2;
}

.knight-piece {
  position: absolute;
  top: 0;
  left: 0;
  width: 25px;
  height: 25px;
  padding: 2px;
  pointer-events: none;
  opacity: 0;
  z-index: 2;
  filter: drop-shadow(0 1px 2px rgba(0,0,0,0.2));
}

.error-page h1 {
  font-size: clamp(3rem, 10vw, 6rem);
  font-weight: 900;
  letter-spacing: -0.04em;
  line-height: 1;
  margin-bottom: var(--space-sm);
  color: var(--color-text);
}

.error-msg {
  font-size: 1.15rem;
  color: var(--color-text-secondary);
  margin-bottom: var(--space-xl);
}

/* ═══════════════════════════════════════════════
   Footer
   ═══════════════════════════════════════════════ */
.site-footer {
  padding: var(--space-2xl) 0 0;
  background: var(--color-surface);
  border-top: 1px solid var(--color-border);
}

.footer-inner {
  display: flex;
  justify-content: space-between;
  gap: var(--space-2xl);
  padding-bottom: var(--space-2xl);
}

.footer-brand .logo {
  margin-bottom: var(--space-sm);
}

.footer-tagline {
  font-size: 0.875rem;
  color: var(--color-text-muted);
}

.footer-links {
  display: flex;
  gap: var(--space-2xl);
}

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

.footer-col h4 {
  font-size: 0.75rem;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.06em;
  color: var(--color-text-muted);
  margin-bottom: var(--space-xs);
}

.footer-col a {
  font-size: 0.875rem;
  color: var(--color-text-secondary);
  text-decoration: none;
}

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

.footer-bottom {
  padding: var(--space-lg) 0;
}

.footer-bottom p {
  font-size: 0.8rem;
  color: var(--color-text-muted);
}

@media (max-width: 540px) {
  .footer-inner {
    flex-direction: column;
    gap: var(--space-xl);
  }

  .footer-links {
    gap: var(--space-xl);
  }
}

/* ═══════════════════════════════════════════════
   Legal / Privacy Page
   ═══════════════════════════════════════════════ */
.legal {
  padding: var(--space-2xl) 0 var(--space-3xl);
}

.legal-inner {
  max-width: var(--container-narrow);
  margin: 0 auto;
}

.legal-inner h1 {
  font-size: clamp(1.75rem, 4vw, 2.5rem);
  font-weight: 800;
  letter-spacing: -0.02em;
  margin-bottom: var(--space-sm);
}

.legal-updated {
  font-size: 0.875rem;
  color: var(--color-text-muted);
  margin-bottom: var(--space-xl);
}

.legal-intro {
  font-size: 1.05rem;
  line-height: 1.7;
  color: var(--color-text-secondary);
  margin-bottom: var(--space-2xl);
  padding-bottom: var(--space-2xl);
  border-bottom: 1px solid var(--color-border-light);
}

.legal-inner h2 {
  font-size: 1.25rem;
  font-weight: 700;
  margin-top: var(--space-xl);
  margin-bottom: var(--space-md);
  letter-spacing: -0.01em;
}

.legal-inner h3 {
  font-size: 1rem;
  font-weight: 600;
  margin-top: var(--space-lg);
  margin-bottom: var(--space-sm);
}

.legal-inner p {
  font-size: 0.938rem;
  line-height: 1.7;
  color: var(--color-text-secondary);
  margin-bottom: var(--space-md);
}

.legal-inner ul {
  list-style: none;
  margin-bottom: var(--space-md);
}

.legal-inner ul li {
  position: relative;
  padding-left: var(--space-lg);
  margin-bottom: var(--space-sm);
  font-size: 0.938rem;
  line-height: 1.7;
  color: var(--color-text-secondary);
}

.legal-inner ul li::before {
  content: "";
  position: absolute;
  left: 0;
  top: 10px;
  width: 6px;
  height: 6px;
  border-radius: 50%;
  background: var(--color-accent);
}

.legal-inner a {
  color: var(--color-accent);
  text-decoration: underline;
  text-underline-offset: 2px;
}

.legal-inner a:hover {
  color: var(--color-accent-dark);
}