/* ============================================================
   Kalimba Tunes — css/style.css
   Design system: MyDoremi — dark navy / terracotta / off-white
   ============================================================ */

/* 1. Custom Properties
   ---------------------------------------------------------- */
:root {
  --color-primary:    #1a1a2e;
  --color-accent:     #e2725b;
  --color-bg:         #f5f7f6;
  --color-text:       #2d2d3a;
  --color-text-light: #4b5563;
  --color-border:     #d5d9d7;

  --font-stack: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, sans-serif;

  --space-xs:   0.5rem;
  --space-sm:   1rem;
  --space-sm-2: 1.5rem;
  --space-md:   2rem;
  --space-lg:   4rem;
  --space-xl:   8rem;

  --max-width: 1100px;
  --radius: 6px;
  --radius-lg: 20px;
  --transition: 0.2s ease;
}

/* 2. Reset
   ---------------------------------------------------------- */
*, *::before, *::after {
  box-sizing: border-box;
  margin: 0;
  padding: 0;
}

ul, ol { list-style: none; }
img, svg { display: block; max-width: 100%; }

/* 3. Base
   ---------------------------------------------------------- */
body {
  font-family: var(--font-stack);
  font-size: 1.05rem;
  line-height: 1.75;
  color: var(--color-text);
  background: var(--color-bg);
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
  text-rendering: optimizeLegibility;
}

h1, h2, h3, h4 {
  color: var(--color-primary);
  line-height: 1.2;
  font-weight: 600;
}

h1 { font-size: 3.5rem; }
h2 { font-size: 1.5rem; }
h3 { font-size: 1.15rem; }

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

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

/* 4. Layout
   ---------------------------------------------------------- */
.container {
  width: 100%;
  max-width: var(--max-width);
  margin: 0 auto;
  padding: 0 var(--space-md);
}

/* 5. Header
   ---------------------------------------------------------- */
.site-header {
  border-bottom: 1px solid var(--color-border);
  padding: var(--space-sm) 0;
  position: sticky;
  top: 0;
  background: var(--color-bg);
  z-index: 10;
}

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

.site-name {
  font-size: 1.1rem;
  font-weight: 700;
  letter-spacing: -0.01em;
  color: var(--color-primary);
}

.nav-links {
  display: flex;
  gap: var(--space-md);
}

.nav-links a {
  font-size: 0.75rem;
  font-weight: 500;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  color: var(--color-text-light);
}

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

/* 6. Section label
   ---------------------------------------------------------- */
.section-label {
  font-size: 0.75rem;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.1em;
  color: var(--color-text-light);
  margin-bottom: var(--space-md);
  padding-bottom: var(--space-xs);
  border-bottom: 1px solid var(--color-border);
}

/* 7. Buttons
   ---------------------------------------------------------- */
.btn {
  display: inline-flex;
  align-items: center;
  gap: 0.5rem;
  padding: 0.65rem 1.5rem;
  border-radius: var(--radius);
  font-weight: 600;
  font-size: 0.9rem;
  transition: background var(--transition);
  cursor: pointer;
  border: none;
}

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

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

.btn-disabled {
  background: var(--color-border);
  color: var(--color-text-light);
  cursor: not-allowed;
  pointer-events: none;
}

/* App Store badge style */
.btn-appstore {
  background: var(--color-primary);
  color: #fff;
  padding: 0.7rem 1.6rem;
  border-radius: var(--radius);
  font-size: 0.85rem;
  font-weight: 600;
  letter-spacing: 0.01em;
  display: inline-flex;
  flex-direction: column;
  align-items: flex-start;
  gap: 0;
  line-height: 1.2;
}

.btn-appstore .badge-label {
  font-size: 0.65rem;
  font-weight: 400;
  text-transform: uppercase;
  letter-spacing: 0.08em;
  opacity: 0.8;
}

.btn-appstore .badge-store {
  font-size: 1rem;
  font-weight: 700;
}

.btn-appstore:hover {
  background: var(--color-text);
  color: #fff;
}

.btn-appstore.btn-disabled {
  background: var(--color-border);
  color: var(--color-text-light);
  pointer-events: none;
}

.btn-appstore.btn-disabled .badge-label,
.btn-appstore.btn-disabled .badge-store {
  color: var(--color-text-light);
}

/* 8. Hero — centered text + screenshots below
   ---------------------------------------------------------- */
.app-hero {
  padding: var(--space-xl) 0 var(--space-lg);
  overflow: hidden;
  text-align: center;
}

.hero-eyebrow {
  font-size: 0.75rem;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.1em;
  color: var(--color-accent);
  margin-bottom: var(--space-sm);
}

.app-hero h1 {
  font-size: 3.5rem;
  font-weight: 700;
  line-height: 1.1;
  color: var(--color-primary);
  margin-bottom: var(--space-sm);
}

.app-hero .tagline {
  font-size: 1.1rem;
  line-height: 1.65;
  color: var(--color-text-light);
  max-width: 520px;
  margin: 0 auto var(--space-sm);
}

.hero-note {
  font-size: 0.8rem;
  font-weight: 500;
  color: var(--color-text-light);
  letter-spacing: 0.04em;
}

/* 9. Screenshots strip (inside hero, no heading)
   ---------------------------------------------------------- */
.screenshot-strip {
  display: flex;
  gap: var(--space-sm-2);
  justify-content: center;
  align-items: flex-start;
  margin-top: var(--space-lg);
  padding: 0 var(--space-md);
  overflow-x: auto;
  -webkit-overflow-scrolling: touch;
  scrollbar-width: none;
}

.screenshot-strip::-webkit-scrollbar { display: none; }

.screenshot-item {
  flex: 0 0 auto;
  width: 260px;
}

.screenshot-item img {
  width: 100%;
  height: auto;
  border-radius: var(--radius-lg);
  display: block;
}

/* 10. Features section
   ---------------------------------------------------------- */
.features-section {
  padding: var(--space-lg) 0;
  border-top: 1px solid var(--color-border);
}

.features-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: var(--space-sm) var(--space-lg);
  margin-top: var(--space-md);
}

.feature-item {
  display: flex;
  gap: var(--space-sm);
  align-items: flex-start;
  padding-bottom: var(--space-sm);
  border-bottom: 1px solid var(--color-border);
}

.feature-item:last-child,
.feature-item:nth-last-child(2):nth-child(odd) {
  border-bottom: none;
}

.feature-dot {
  flex-shrink: 0;
  width: 6px;
  height: 6px;
  border-radius: 50%;
  background: var(--color-accent);
  margin-top: 0.65rem;
}

.feature-item h3 {
  font-size: 0.95rem;
  font-weight: 600;
  color: var(--color-primary);
  margin-bottom: 0.15rem;
}

.feature-item p {
  font-size: 0.875rem;
  color: var(--color-text-light);
  line-height: 1.55;
}

/* 11. About
   ---------------------------------------------------------- */
.about-section {
  padding: var(--space-lg) 0;
  border-top: 1px solid var(--color-border);
}

.about-section p {
  color: var(--color-text-light);
  line-height: 1.8;
  text-align: justify;
  margin-bottom: var(--space-sm);
}

.about-section p:last-child {
  margin-bottom: 0;
}

/* 12. Contact / CTA section
   ---------------------------------------------------------- */
.contact-section {
  padding: var(--space-lg) 0;
  border-top: 1px solid var(--color-border);
}

.contact-email {
  display: inline-block;
  margin-top: var(--space-sm);
  font-size: 1.25rem;
  font-weight: 600;
  color: var(--color-primary);
  border-bottom: 2px solid var(--color-primary);
  padding-bottom: 2px;
}

.contact-email:hover {
  color: var(--color-accent);
  border-color: var(--color-accent);
}

/* 13. Footer
   ---------------------------------------------------------- */
.site-footer {
  border-top: 1px solid var(--color-border);
  padding: var(--space-md) 0;
  font-size: 0.8rem;
  color: var(--color-text-light);
}

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

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

.footer-links a {
  font-size: 0.75rem;
  font-weight: 500;
  letter-spacing: 0.02em;
  color: var(--color-text-light);
}

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

/* 14. Support page
   ---------------------------------------------------------- */
.support-page {
  padding: var(--space-lg) 0;
}

.support-page h1 {
  font-size: 3rem;
  margin-bottom: var(--space-sm);
}

.support-page .intro {
  font-size: 1.05rem;
  color: var(--color-text-light);
  max-width: 540px;
  margin-bottom: var(--space-lg);
}

.faq-list {
  margin-top: var(--space-md);
}

.faq-item {
  border-bottom: 1px solid var(--color-border);
  padding: var(--space-sm) 0;
}

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

.faq-item summary {
  font-weight: 600;
  font-size: 1rem;
  color: var(--color-primary);
  cursor: pointer;
  list-style: none;
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding: var(--space-xs) 0;
}

.faq-item summary::-webkit-details-marker { display: none; }

.faq-item summary::after {
  content: "+";
  font-size: 1.25rem;
  font-weight: 400;
  color: var(--color-text-light);
  flex-shrink: 0;
  margin-left: var(--space-sm);
  transition: transform var(--transition);
}

.faq-item[open] summary::after {
  content: "−";
}

.faq-item .answer {
  padding: var(--space-xs) 0 var(--space-sm);
  color: var(--color-text-light);
  font-size: 0.95rem;
  line-height: 1.7;
  max-width: 640px;
}

.support-contact {
  margin-top: var(--space-lg);
  padding-top: var(--space-lg);
  border-top: 1px solid var(--color-border);
}

/* 15. Legal pages
   ---------------------------------------------------------- */
.legal-page {
  padding: var(--space-lg) 0;
}

.legal-page h1 {
  font-size: 3rem;
  margin-bottom: var(--space-sm);
}

.legal-page .last-updated {
  font-size: 0.9rem;
  color: var(--color-text-light);
  margin-bottom: var(--space-lg);
  padding-bottom: var(--space-lg);
  border-bottom: 1px solid var(--color-border);
}

.legal-page h2 {
  font-size: 1.2rem;
  font-weight: 600;
  color: var(--color-primary);
  margin-top: var(--space-lg);
  margin-bottom: var(--space-sm);
}

.legal-page h3 {
  font-size: 1.05rem;
  font-weight: 600;
  color: var(--color-primary);
  margin-top: var(--space-md);
  margin-bottom: var(--space-xs);
}

.legal-page p { margin-bottom: var(--space-sm); }
.legal-page p:last-child { margin-bottom: 0; }

.legal-page ul,
.legal-page ol {
  list-style: disc;
  padding-left: var(--space-md);
  margin-bottom: var(--space-sm);
}

.legal-page ol { list-style: decimal; }
.legal-page li { margin-bottom: var(--space-xs); }

.legal-page a {
  color: var(--color-primary);
  border-bottom: 1px solid var(--color-border);
  padding-bottom: 1px;
}

.legal-page a:hover {
  color: var(--color-accent);
  border-color: var(--color-accent);
}

/* 16. 404 page
   ---------------------------------------------------------- */
.not-found {
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  min-height: 60vh;
  text-align: center;
  padding: var(--space-lg) var(--space-md);
}

.not-found h1 {
  font-size: 5rem;
  font-weight: 600;
  color: var(--color-primary);
  line-height: 1;
  margin-bottom: var(--space-sm);
}

.not-found p {
  color: var(--color-text-light);
  margin-bottom: var(--space-md);
}

/* 17. Mobile (≤640px)
   ---------------------------------------------------------- */
@media (max-width: 640px) {
  h1 { font-size: 2.25rem; }
  h2 { font-size: 1.25rem; }

  .nav-links { gap: var(--space-sm); }

  /* Hero */
  .app-hero { padding: var(--space-lg) 0 var(--space-md); }
  .app-hero h1 { font-size: 2.5rem; }

  /* Screenshots: horizontal scroll on mobile */
  .screenshot-strip {
    justify-content: flex-start;
    margin-top: var(--space-md);
  }

  .screenshot-item { width: 200px; }

  /* Features: single column */
  .features-grid { grid-template-columns: 1fr; }
  .feature-item { border-bottom: 1px solid var(--color-border) !important; }

  /* Footer */
  .site-footer .container {
    flex-direction: column;
    align-items: flex-start;
  }

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

  /* Legal / support */
  .legal-page h1,
  .support-page h1 { font-size: 2.25rem; }

  .contact-email { font-size: 1.05rem; }
}