/* ==========================================================================
   MomoMochi — Light, premium landing page
   Raw CSS. No frameworks, no build step.
   ========================================================================== */

:root {
  /* Light palette */
  --bg: #FDFBFA;
  --bg-elevated: #FFFFFF;
  --surface: #FFFFFF;
  --surface-2: #FFF0ED;
  --border: #F0EAE8;
  --ink: #1A1A1A;
  --muted: #666666;
  --accent: #E66A5C;        /* coral */
  --accent-strong: #FF7B6D; /* bright coral */

  /* Design system */
  --radius-lg: 28px;
  --radius-sm: 12px;
  --max-width: 1200px;
  --shadow-soft: 0 20px 40px rgba(0, 0, 0, 0.06);
  --shadow-strong: 0 30px 60px rgba(255, 123, 109, 0.15);
  --transition: all 0.4s cubic-bezier(0.23, 1, 0.32, 1);
}

* {
  box-sizing: border-box;
}

html {
  scroll-behavior: smooth;
  overflow-x: hidden;
}

body {
  margin: 0;
  font-family: -apple-system, BlinkMacSystemFont, "Inter", "Segoe UI", Roboto, Helvetica, Arial, sans-serif;
  color: var(--ink);
  background:
    radial-gradient(1100px 500px at 85% -10%, rgba(255, 123, 109, 0.08), transparent 60%),
    var(--bg);
  line-height: 1.6;
  -webkit-font-smoothing: antialiased;
  overflow-x: hidden;
  width: 100%;
  position: relative;
}

a {
  color: var(--accent);
  text-decoration: none;
  transition: color 0.2s ease;
}

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

h1, h2, h3 {
  line-height: 1.1;
  margin: 0;
  font-weight: 800;
  letter-spacing: -0.03em;
  text-wrap: balance;
}

::selection {
  background: var(--accent);
  color: var(--bg);
}

a:focus-visible,
button:focus-visible {
  outline: 2px solid var(--accent);
  outline-offset: 3px;
}

[id] {
  scroll-margin-top: 5rem;
}

/* --------------------------------------------------------------------------
   Header
   -------------------------------------------------------------------------- */

.site-header {
  position: sticky;
  top: 0;
  z-index: 100;
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 1.2rem clamp(1.5rem, 5vw, 3rem);
  background: rgba(253, 251, 250, 0.72);
  backdrop-filter: blur(16px);
  -webkit-backdrop-filter: blur(16px);
  border-bottom: 1px solid var(--border);
}

.brand {
  display: inline-flex;
  align-items: center;
  gap: 0.5rem;
  font-weight: 800;
  font-size: 1.25rem;
  color: var(--ink);
}

.brand-mark {
  width: 24px;
  height: 20px;
  flex-shrink: 0;
}

.site-nav {
  display: flex;
  gap: 2rem;
  font-size: 0.95rem;
  font-weight: 500;
}

.site-nav a {
  color: var(--muted);
}

.site-nav a:hover {
  color: var(--ink);
}

.nav-toggle {
  display: none;
  flex-direction: column;
  gap: 6px;
  padding: 10px;
  background: none;
  border: 0;
  cursor: pointer;
}

.nav-toggle-bar {
  width: 24px;
  height: 2px;
  background: var(--ink);
  border-radius: 2px;
}

/* --------------------------------------------------------------------------
   Hero
   -------------------------------------------------------------------------- */

.hero {
  display: grid;
  grid-template-columns: 1.2fr 0.8fr;
  align-items: center;
  gap: 4rem;
  max-width: var(--max-width);
  margin: 0 auto;
  padding: clamp(4rem, 12vw, 10rem) clamp(1.5rem, 5vw, 3rem);
}

.hero-title {
  font-size: clamp(3rem, 10vw, 5rem);
  margin-bottom: 1.5rem;
  color: var(--ink);
}

.hero-sub {
  font-size: clamp(1.1rem, 3vw, 1.3rem);
  color: var(--muted);
  max-width: 42em;
}

.hero-visual {
  display: flex;
  justify-content: center;
  perspective: 1000px;
}

.phone-container {
  position: relative;
  transform: rotateY(-10deg) rotateX(5deg);
  transition: var(--transition);
}

.phone-container:hover {
  transform: rotateY(0deg) rotateX(0deg);
}

.phone-glow {
  position: absolute;
  inset: -40px;
  background: radial-gradient(circle at 50% 55%, rgba(255, 123, 109, 0.15), transparent 65%);
  pointer-events: none;
}

.phone {
  position: relative;
  width: min(300px, 78vw);
  aspect-ratio: 300 / 620;
  border-radius: 50px;
  background: #0C0C10;
  padding: 12px;
  border: 1px solid #2A2A33;
  box-shadow: var(--shadow-strong);
}

.dynamic-island {
  position: absolute;
  top: 22px;
  left: 50%;
  transform: translateX(-50%);
  width: 100px;
  height: 30px;
  background: #000;
  border-radius: 999px;
  z-index: 10;
}

.phone-screen {
  width: 100%;
  height: 100%;
  border-radius: 38px;
  background: var(--bg-elevated);
  overflow: hidden;
  position: relative;
}

.app-home {
  padding: 60px 20px 20px;
  display: flex;
  flex-direction: column;
  gap: 24px;
}

.app-header {
  display: flex;
  justify-content: space-between;
  align-items: center;
  margin-bottom: 10px;
}

.app-greeting {
  font-weight: 800;
  font-size: 1.1rem;
  color: var(--ink);
}

.app-avatar {
  width: 36px;
  height: 36px;
  display: flex;
  align-items: center;
  justify-content: center;
  border-radius: 50%;
  background: var(--surface-2);
  border: 1px solid var(--border);
}

.app-avatar svg {
  width: 22px;
  height: 18px;
}

.section-label {
  font-size: 0.8rem;
  font-weight: 700;
  color: var(--muted);
  text-transform: uppercase;
  letter-spacing: 0.05em;
  margin-bottom: 12px;
  display: block;
}

.app-card {
  display: flex;
  align-items: center;
  gap: 12px;
  padding: 12px;
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius-sm);
  margin-bottom: 12px;
  transition: var(--transition);
}

.app-card:hover {
  transform: scale(1.02);
  box-shadow: var(--shadow-soft);
}

.card-art {
  width: 50px;
  height: 70px;
  border-radius: 8px;
  flex-shrink: 0;
}

.card-info {
  display: flex;
  flex-direction: column;
}

.card-title {
  font-weight: 700;
  font-size: 0.9rem;
  color: var(--ink);
}

.card-meta {
  font-size: 0.75rem;
  color: var(--muted);
}

.hero-mochi {
  position: absolute;
  bottom: -16px;
  left: -34px;
  width: 84px;
  pointer-events: none;
}

.hero-mochi svg {
  display: block;
}

/* --------------------------------------------------------------------------
   Features
   -------------------------------------------------------------------------- */

.features {
  max-width: var(--max-width);
  margin: 0 auto;
  padding: clamp(6rem, 15vw, 12rem) clamp(1.5rem, 5vw, 3rem);
}

.feature-row {
  display: grid;
  grid-template-columns: 1fr 1fr;
  align-items: center;
  gap: 6rem;
  margin-bottom: clamp(6rem, 12vw, 10rem);
}

.feature-row:last-child {
  margin-bottom: 0;
}

/* Flip columns for alternating rows without touching inner text direction */
.feature-row.reverse .feature-visual {
  order: -1;
}

.feature-eyebrow {
  display: inline-block;
  color: var(--accent);
  font-weight: 700;
  font-size: 0.9rem;
  text-transform: uppercase;
  letter-spacing: 0.1em;
  margin-bottom: 1rem;
}

.feature-text h2 {
  font-size: clamp(2rem, 5vw, 3rem);
  margin-bottom: 1.5rem;
  color: var(--ink);
}

.feature-text p {
  font-size: 1.15rem;
  color: var(--muted);
  max-width: 32em;
}

.feature-visual {
  display: flex;
  justify-content: center;
}

/* Mockup screens */
.mockup-screen {
  width: min(280px, 80vw);
  aspect-ratio: 280 / 500;
  background: var(--bg-elevated);
  border-radius: var(--radius-lg);
  box-shadow: var(--shadow-strong);
  border: 1px solid var(--border);
  padding: 24px;
  position: relative;
  overflow: hidden;
}

/* Discover */
.mockup-screen.discover .mockup-search {
  background: var(--surface);
  border: 1px solid var(--border);
  padding: 12px;
  border-radius: var(--radius-sm);
  font-size: 0.8rem;
  color: var(--muted);
  margin-bottom: 20px;
  display: flex;
  align-items: center;
  gap: 8px;
}

.mockup-screen.discover .mockup-grid {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 12px;
}

.mockup-screen.discover .grid-item {
  aspect-ratio: 2/3;
  border-radius: var(--radius-sm);
}

.mockup-screen.discover .grid-item:nth-child(1) { background: linear-gradient(135deg, #ff9a9e, #fecfef); }
.mockup-screen.discover .grid-item:nth-child(2) { background: linear-gradient(135deg, #a18cd1, #fbc2eb); }
.mockup-screen.discover .grid-item:nth-child(3) { background: linear-gradient(135deg, #fbc2eb, #a6c1ee); }
.mockup-screen.discover .grid-item:nth-child(4) { background: linear-gradient(135deg, #fdcbf1, #e6dee9); }
.mockup-screen.discover .grid-item:nth-child(5) { background: linear-gradient(135deg, #f6d365, #fda085); }
.mockup-screen.discover .grid-item:nth-child(6) { background: linear-gradient(135deg, #84fab0, #8fd3f4); }

/* Track */
.mockup-screen.track .track-header {
  font-weight: 800;
  margin-bottom: 20px;
  text-align: center;
  color: var(--ink);
}

.mockup-screen.track .track-item {
  display: flex;
  align-items: center;
  gap: 12px;
  padding: 12px 0;
  border-bottom: 1px solid var(--border);
}

.mockup-screen.track .track-item.active {
  flex-wrap: wrap;
}

.mockup-screen.track .track-check {
  width: 20px;
  height: 20px;
  border: 2px solid var(--border);
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 0.7rem;
  font-weight: 800;
  color: var(--bg);
}

.mockup-screen.track .track-item.done .track-check {
  background: var(--accent);
  border-color: var(--accent);
}

.mockup-screen.track .track-item.active .track-check {
  border-color: var(--accent);
}

.mockup-screen.track .track-details {
  display: flex;
  flex-direction: column;
  flex: 1;
}

.mockup-screen.track .track-title {
  font-weight: 600;
  font-size: 0.9rem;
  color: var(--ink);
}

.mockup-screen.track .track-status {
  font-size: 0.7rem;
  color: var(--muted);
}

.mockup-screen.track .track-progress-bar {
  flex-basis: 100%;
  height: 4px;
  background: var(--surface-2);
  border-radius: 2px;
  margin-top: 8px;
  overflow: hidden;
}

.mockup-screen.track .progress-fill {
  height: 100%;
  background: var(--accent);
}

/* Rate */
.mockup-screen.rate .rate-header {
  font-weight: 800;
  text-align: center;
  margin-bottom: 30px;
  color: var(--ink);
}

.mockup-screen.rate .star-rating {
  display: flex;
  justify-content: center;
  gap: 8px;
  font-size: 2rem;
  color: var(--accent);
  margin-bottom: 30px;
}

.mockup-screen.rate .star-rating .muted {
  color: var(--surface-2);
}

.mockup-screen.rate .comment-box {
  background: var(--surface);
  border: 1px solid var(--border);
  padding: 16px;
  border-radius: var(--radius-sm);
  font-size: 0.85rem;
  color: var(--muted);
  margin-bottom: 24px;
  min-height: 80px;
}

.mockup-screen.rate .rate-btn {
  background: var(--accent);
  color: var(--bg);
  text-align: center;
  padding: 12px;
  border-radius: var(--radius-sm);
  font-weight: 700;
  font-size: 0.9rem;
}

/* Library */
.mockup-screen.library .lib-tabs {
  display: flex;
  gap: 8px;
  margin-bottom: 20px;
}

.mockup-screen.library .tab {
  font-size: 0.7rem;
  padding: 4px 12px;
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: 999px;
  color: var(--muted);
  font-weight: 600;
}

.mockup-screen.library .tab.active {
  background: var(--accent);
  border-color: var(--accent);
  color: var(--bg);
}

.mockup-screen.library .lib-row {
  display: flex;
  justify-content: space-between;
  padding: 12px 0;
  border-bottom: 1px solid var(--border);
  font-size: 0.85rem;
  font-weight: 500;
  color: var(--ink);
}

.mockup-screen.library .lib-status {
  color: var(--muted);
  font-weight: 400;
}

/* --------------------------------------------------------------------------
   Info sections
   -------------------------------------------------------------------------- */

.info-sections {
  max-width: var(--max-width);
  margin: 0 auto;
  padding: clamp(4rem, 10vw, 8rem) clamp(1.5rem, 5vw, 3rem);
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 4rem;
}

.info-block h3 {
  font-size: 1.2rem;
  margin-bottom: 1rem;
  color: var(--ink);
}

.info-block p {
  color: var(--muted);
  font-size: 0.95rem;
}

/* --------------------------------------------------------------------------
   Footer
   -------------------------------------------------------------------------- */

.site-footer {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  justify-content: space-between;
  gap: 2rem;
  padding: 2rem clamp(1.5rem, 5vw, 3rem);
  border-top: 1px solid var(--border);
  color: var(--muted);
  font-size: 0.9rem;
}

.site-footer nav {
  display: flex;
  gap: 2rem;
}

.site-footer a {
  color: var(--muted);
}

.site-footer a:hover {
  color: var(--ink);
}

/* --------------------------------------------------------------------------
   Reveal (progressive enhancement — content is visible without JS)
   -------------------------------------------------------------------------- */

.js .reveal {
  opacity: 0;
  transform: translateY(30px);
  transition: opacity 0.8s cubic-bezier(0.23, 1, 0.32, 1),
              transform 0.8s cubic-bezier(0.23, 1, 0.32, 1);
}

.js .reveal.visible {
  opacity: 1;
  transform: none;
}

/* --------------------------------------------------------------------------
   Responsive
   -------------------------------------------------------------------------- */

@media (max-width: 1024px) {
  .feature-row {
    gap: 3rem;
  }
}

@media (max-width: 860px) {
  .hero {
    grid-template-columns: 1fr;
    text-align: center;
  }

  .hero-content {
    display: flex;
    flex-direction: column;
    align-items: center;
  }

  .hero-sub {
    margin-left: auto;
    margin-right: auto;
  }

  .hero-visual {
    order: -1;
  }
}

@media (max-width: 768px) {
  .feature-row {
    grid-template-columns: 1fr;
    text-align: center;
    gap: 3rem;
  }

  .feature-row.reverse .feature-visual {
    order: 0;
  }

  .feature-text {
    display: flex;
    flex-direction: column;
    align-items: center;
  }

  .feature-text p {
    margin: 0 auto;
  }

  .info-sections {
    grid-template-columns: 1fr;
    gap: 3rem;
  }
}

@media (max-width: 600px) {
  .site-nav {
    display: none;
    position: absolute;
    top: 100%;
    left: 0;
    right: 0;
    flex-direction: column;
    gap: 0;
    background: var(--bg);
    border-bottom: 1px solid var(--border);
    box-shadow: 0 20px 40px rgba(0, 0, 0, 0.08);
    padding: 1rem 0;
    text-align: center;
  }

  .site-nav.open {
    display: flex;
  }

  .site-nav a {
    padding: 1rem;
  }

  .nav-toggle {
    display: flex;
  }

  .phone-container {
    transform: none;
  }

  .phone-glow {
    inset: -20px;
  }

  .hero-mochi {
    left: -12px;
    bottom: -12px;
    width: 64px;
  }
}

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

  .js .reveal {
    transition: none;
    opacity: 1;
    transform: none;
  }

  .phone-container {
    transition: none;
  }
}