/* ===== CUSTOM PROPERTIES ===== */
:root {
  /* Light mode (default) — matches hajimete app Theme.swift */
  --bg: #C7B89C;
  --bg-alt: #BFB093;
  --txt: #2E261E;
  --sub: #6B6152;
  --accent: #52483B;
  --star: #9E8045;
  --line: rgba(46, 38, 31, 0.15);
  --card-bg: rgba(46, 38, 31, 0.05);
  --card-border: rgba(46, 38, 31, 0.12);
  --btn-bg: rgba(46, 38, 31, 0.06);
  --btn-border: rgba(46, 38, 31, 0.20);
  --primary-bg: #2E261E;
  --primary-fg: #C7B89C;

  /* Spacing — matches app spXS..spXL */
  --sp-xs: 4px;
  --sp-sm: 8px;
  --sp-md: 16px;
  --sp-lg: 24px;
  --sp-xl: 40px;
  --sp-2xl: 64px;
  --sp-3xl: 96px;

  /* Typography */
  --font: 'Shippori Mincho', 'Hiragino Mincho ProN', serif;
  --tracking: 0.08em;
  --tracking-wide: 0.15em;
}

[data-theme="dark"] {
  --bg: #121311;
  --bg-alt: #1A1918;
  --txt: #C7BAAB;
  --sub: #807366;
  --accent: #999980;
  --star: #D1B884;
  --line: rgba(199, 186, 171, 0.12);
  --card-bg: rgba(199, 186, 171, 0.05);
  --card-border: rgba(199, 186, 171, 0.10);
  --btn-bg: rgba(199, 186, 171, 0.06);
  --btn-border: rgba(199, 186, 171, 0.15);
  --primary-bg: #C7BAAB;
  --primary-fg: #121311;
}

/* ===== RESET & BASE ===== */
*,
*::before,
*::after {
  margin: 0;
  padding: 0;
  box-sizing: border-box;
}

html {
  scroll-behavior: smooth;
  scroll-padding-top: 72px;
}

body {
  font-family: var(--font);
  font-weight: 400;
  color: var(--txt);
  background-color: transparent;
  letter-spacing: var(--tracking);
  line-height: 1.9;
  font-size: 15px;
  -webkit-font-smoothing: antialiased;
  transition: color 0.4s ease;
}

/* Noise texture removed for performance */

/* Living paper background — animated blurred blobs */
.living-bg {
  position: fixed;
  inset: 0;
  width: 100%;
  height: 100%;
  z-index: -1;
  overflow: hidden;
  background: var(--bg);
  border: 1px solid var(--line);
  transition: background-color 0.4s ease, border-color 0.4s ease;
}

.blob {
  position: absolute;
  border-radius: 50%;
}

/* Light mode blobs — static positioning for performance */
.blob-1 {
  width: 60vmax;
  height: 55vmax;
  background: rgba(217, 140, 133, 0.55);
  filter: blur(80px);
  transform: translate(20vw, 30vh);
}
.blob-2 {
  width: 55vmax;
  height: 60vmax;
  background: rgba(133, 179, 122, 0.50);
  filter: blur(75px);
  transform: translate(-18vw, -30vh);
}
.blob-3 {
  width: 65vmax;
  height: 52vmax;
  background: rgba(242, 204, 102, 0.55);
  filter: blur(85px);
  transform: translate(-15vw, 35vh);
}
.blob-4 {
  width: 50vmax;
  height: 58vmax;
  background: rgba(140, 148, 184, 0.45);
  filter: blur(70px);
  transform: translate(20vw, -32vh);
}
.blob-5 {
  width: 60vmax;
  height: 65vmax;
  background: rgba(217, 184, 115, 0.50);
  filter: blur(90px);
  transform: translate(18vw, -26vh);
}

/* Dark mode blobs */
[data-theme="dark"] .blob-1 { background: rgba(46, 20, 18, 0.90); }
[data-theme="dark"] .blob-2 { background: rgba(15, 36, 13, 0.88); }
[data-theme="dark"] .blob-3 { background: rgba(51, 38, 10, 0.90); }
[data-theme="dark"] .blob-4 { background: rgba(18, 18, 36, 0.85); }
[data-theme="dark"] .blob-5 { background: rgba(36, 26, 13, 0.90); }

/* Keyframe animations removed — using static positioning for performance */

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

.external-link::after {
  content: ' ↗';
  font-size: 0.85em;
  opacity: 0.6;
  margin-left: 2px;
}

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

/* ===== HEADER ===== */
.header {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  z-index: 100;
  background: rgba(199, 184, 156, 0.02);
  backdrop-filter: blur(12px);
  -webkit-backdrop-filter: blur(12px);
  border-bottom: 1px solid var(--line);
  transition: background 0.4s ease;
}

[data-theme="dark"] .header {
  background: rgba(18, 19, 17, 0.02);
}

.header-inner {
  max-width: 960px;
  margin: 0 auto;
  padding: 0 var(--sp-lg);
  height: 56px;
  display: flex;
  align-items: center;
  justify-content: space-between;
}

.logo-text {
  font-size: 17px;
  font-weight: 500;
  letter-spacing: var(--tracking-wide);
}

.nav {
  display: flex;
  gap: var(--sp-lg);
}

.nav-link {
  font-size: 12px;
  color: var(--sub);
  letter-spacing: var(--tracking-wide);
  transition: color 0.2s;
}

.nav-link:hover {
  color: var(--txt);
}

.header-controls {
  display: flex;
  gap: var(--sp-sm);
}

.toggle-btn {
  display: flex;
  align-items: center;
  gap: 2px;
  background: var(--btn-bg);
  border: 1px solid var(--btn-border);
  border-radius: 20px;
  padding: 3px 4px;
  cursor: pointer;
  font-family: var(--font);
  transition: all 0.2s;
}

.toggle-option {
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 11px;
  padding: 3px 8px;
  border-radius: 14px;
  color: var(--sub);
  transition: all 0.25s ease;
  letter-spacing: 0.04em;
  line-height: 1;
}

.toggle-option.active {
  background: var(--primary-bg);
  color: var(--primary-fg);
}

/* ===== HERO ===== */
.hero {
  min-height: 100svh;
  display: flex;
  align-items: center;
  justify-content: center;
  text-align: center;
  padding: var(--sp-3xl) var(--sp-lg);
}

.hero-inner {
  max-width: 1400px;
  width: 100%;
  display: flex;
  gap: var(--sp-3xl);
  align-items: center;
  justify-content: center;
}

.hero-content {
  text-align: left;
  max-width: 500px;
  flex-shrink: 0;
}

.hero-sub {
  font-size: 12px;
  color: var(--sub);
  letter-spacing: var(--tracking-wide);
  margin-bottom: var(--sp-lg);
}

.hero-title {
  font-size: clamp(28px, 6vw, 40px);
  font-weight: 500;
  line-height: 1.6;
  letter-spacing: var(--tracking-wide);
  margin-bottom: var(--sp-xl);
}

.hero-desc {
  font-size: 14px;
  color: var(--sub);
  line-height: 2.2;
  margin-bottom: var(--sp-xl);
}

.cta-btn {
  display: inline-block;
  font-family: var(--font);
  font-size: 14px;
  font-weight: 500;
  letter-spacing: var(--tracking-wide);
  color: var(--primary-fg);
  background: var(--primary-bg);
  padding: 14px 32px;
  border-radius: 40px;
  transition: transform 0.25s cubic-bezier(0.34, 1.56, 0.64, 1), opacity 0.2s;
}

.cta-btn:hover {
  transform: scale(1.03);
}

.cta-btn:active {
  transform: scale(0.97);
  opacity: 0.85;
}

.cta-btn--coming {
  cursor: default;
  opacity: 0.7;
}

.cta-btn--coming:hover {
  transform: none;
}

.cta-btn--coming:active {
  transform: none;
  opacity: 0.7;
}

.hero-badges {
  display: flex;
  justify-content: flex-start;
  gap: var(--sp-sm);
  margin-top: var(--sp-lg);
  flex-wrap: wrap;
}

.hero-device {
  display: flex;
  justify-content: center;
  align-items: center;
  flex-shrink: 0;
}

.iphone-frame {
  position: relative;
  width: 280px;
  height: 580px;
  background: #000;
  border-radius: 44px;
  padding: 8px;
  box-shadow: 0 20px 60px rgba(0, 0, 0, 0.3);
}

.iphone-frame img {
  display: block;
  width: 100%;
  height: 100%;
  border-radius: 38px;
  object-fit: cover;
}

/* ===== Screens Gallery ===== */
.screens-scroll {
  display: flex;
  gap: var(--sp-xl);
  justify-content: center;
  flex-wrap: nowrap;
  overflow-x: auto;
  -webkit-overflow-scrolling: touch;
  scrollbar-width: none;
  padding: var(--sp-xl) 0;
}

.screens-scroll::-webkit-scrollbar {
  display: none;
}

.screen-item {
  flex-shrink: 0;
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: var(--sp-md);
}

.screen-label {
  font-size: 12px;
  color: var(--sub);
  letter-spacing: var(--tracking-wide);
}

.iphone-frame--sm {
  width: 180px;
  height: 373px;
}

.iphone-frame--sm img {
  border-radius: 28px;
}

.badge {
  font-size: 11px;
  color: var(--sub);
  letter-spacing: var(--tracking);
  padding: 4px 12px;
  border: 1px solid var(--btn-border);
  border-radius: 20px;
}

/* ===== SECTIONS ===== */
.section {
  padding: var(--sp-3xl) var(--sp-lg);
}

.section-inner {
  max-width: 720px;
  margin: 0 auto;
}

.section-label {
  font-size: 11px;
  color: var(--sub);
  letter-spacing: var(--tracking-wide);
  text-align: center;
  margin-bottom: var(--sp-md);
  text-transform: uppercase;
}

.section-title {
  font-size: clamp(22px, 4.5vw, 30px);
  font-weight: 500;
  text-align: center;
  line-height: 1.6;
  letter-spacing: var(--tracking);
  margin-bottom: var(--sp-xl);
}

/* ===== CONCEPT ===== */
.concept-body {
  max-width: 560px;
  margin: 0 auto;
}

.concept-text {
  font-size: 15px;
  color: var(--sub);
  line-height: 2.2;
  margin-bottom: var(--sp-lg);
  text-align: center;
}

.concept-text:last-child {
  margin-bottom: 0;
}

/* ===== EXAMPLES ===== */
.examples-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: var(--sp-lg);
}

.example-card {
  background: var(--card-bg);
  border-radius: 16px;
  padding: var(--sp-lg);
  text-align: center;
}

.example-icon {
  display: block;
  font-size: 24px;
  margin-bottom: var(--sp-md);
}

.example-title {
  font-size: 15px;
  font-weight: 500;
  margin-bottom: var(--sp-md);
  letter-spacing: var(--tracking);
}

.example-list {
  list-style: none;
  font-size: 13px;
  color: var(--sub);
  line-height: 2;
}

/* ===== WORLDVIEW ===== */
.worldview-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: var(--sp-lg);
}

.worldview-item {
  text-align: center;
}

.worldview-visual {
  width: 96px;
  height: 96px;
  margin: 0 auto var(--sp-md);
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
  background: var(--card-bg);
  color: var(--txt);
}

.color-palette-visual {
  background: linear-gradient(145deg,
    rgba(46, 38, 31, 0.04) 0%,
    rgba(46, 38, 31, 0.08) 100%);
}

[data-theme="dark"] .color-palette-visual {
  background: linear-gradient(145deg,
    rgba(199, 186, 171, 0.04) 0%,
    rgba(199, 186, 171, 0.08) 100%);
}

.palette-svg {
  display: block;
}

.photo-frame-visual {
  background: var(--card-bg);
  color: var(--sub);
}

.photo-frame-visual svg {
  display: block;
}

.star-visual {
  background: var(--card-bg);
  color: var(--star);
}

.star-visual svg,
.frame-svg {
  display: block;
}

.star-svg {
  display: block;
  width: 36px;
  height: 36px;
}

.worldview-title {
  font-size: 15px;
  font-weight: 500;
  margin-bottom: var(--sp-sm);
  letter-spacing: var(--tracking);
}

.worldview-desc {
  font-size: 13px;
  color: var(--sub);
  line-height: 2;
}

/* ===== HOW TO USE ===== */
.steps {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: var(--sp-xl);
  counter-reset: step;
}

.step {
  text-align: center;
}

.step-num {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 36px;
  height: 36px;
  border-radius: 50%;
  border: 1.5px solid var(--btn-border);
  font-size: 14px;
  color: var(--sub);
  margin-bottom: var(--sp-md);
  font-weight: 500;
}

.step-title {
  font-size: 15px;
  font-weight: 500;
  margin-bottom: var(--sp-sm);
  letter-spacing: var(--tracking);
}

.step-desc {
  font-size: 13px;
  color: var(--sub);
  line-height: 2;
}

/* ===== PREMIUM ===== */
.premium {
  background: rgba(46, 38, 31, 0.04);
}

[data-theme="dark"] .premium {
  background: rgba(199, 186, 171, 0.03);
}

.premium-intro {
  font-size: 17px;
  font-weight: 500;
  color: var(--txt);
  text-align: center;
  line-height: 2.2;
  margin-bottom: var(--sp-2xl);
}

.premium-features {
  max-width: 480px;
  margin: 0 auto var(--sp-xl);
  display: flex;
  flex-direction: column;
  gap: var(--sp-lg);
}

.premium-feature {
  display: flex;
  align-items: flex-start;
  gap: var(--sp-md);
  padding: var(--sp-lg);
  background: var(--card-bg);

  border-radius: 16px;
}

.premium-icon {
  flex-shrink: 0;
  margin-top: 2px;
  color: var(--sub);
  display: flex;
  align-items: center;
  justify-content: center;
  width: 48px;
  height: 48px;
  border-radius: 50%;
  background: var(--card-bg);
}

.premium-icon svg {
  display: block;
  width: 22px;
  height: 22px;
}

.premium-title {
  font-size: 15px;
  font-weight: 500;
  margin-bottom: var(--sp-xs);
  letter-spacing: var(--tracking);
}

.premium-desc {
  font-size: 13px;
  color: var(--sub);
  line-height: 1.9;
}

.premium-price {
  text-align: center;
}

.price {
  display: block;
  font-size: 20px;
  font-weight: 500;
  letter-spacing: 0.04em;
  margin-bottom: var(--sp-xs);
  color: var(--sub);
}

.price-note {
  font-size: 12px;
  color: var(--sub);
  letter-spacing: var(--tracking);
}

/* ===== PRIVACY ===== */
.privacy-box {
  max-width: 480px;
  margin: 0 auto;
  text-align: center;
  padding: var(--sp-xl);
  background: var(--card-bg);

  border-radius: 16px;
}

.privacy-title {
  font-size: 17px;
  font-weight: 500;
  margin-bottom: var(--sp-md);
  letter-spacing: var(--tracking);
}

.privacy-desc {
  font-size: 13px;
  color: var(--sub);
  line-height: 2;
}

/* ===== FAQ ===== */
.faq-list {
  max-width: 560px;
  margin: 0 auto;
}

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

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

.faq-q {
  display: block;
  padding: var(--sp-lg) 0;
  font-size: 15px;
  font-weight: 500;
  cursor: pointer;
  letter-spacing: var(--tracking);
  list-style: none;
  position: relative;
  padding-right: 32px;
}

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

.faq-q::after {
  content: '+';
  position: absolute;
  right: 0;
  top: 50%;
  transform: translateY(-50%);
  font-size: 18px;
  font-weight: 400;
  color: var(--sub);
  transition: transform 0.3s ease;
}

.faq-item[open] .faq-q::after {
  transform: translateY(-50%) rotate(45deg);
}

.faq-a {
  font-size: 14px;
  color: var(--sub);
  line-height: 2;
  padding-bottom: var(--sp-lg);
}

/* ===== BOTTOM CTA ===== */
.bottom-cta {
  text-align: center;
  padding: var(--sp-3xl) var(--sp-lg) var(--sp-2xl);
}

.cta-title {
  font-size: clamp(22px, 4.5vw, 30px);
  font-weight: 500;
  line-height: 1.8;
  letter-spacing: var(--tracking);
  margin-bottom: var(--sp-xl);
}

/* ===== FOOTER ===== */
.footer {
  border-top: 1px solid var(--line);
  padding: var(--sp-xl) var(--sp-lg);
}

.footer-inner {
  max-width: 720px;
  margin: 0 auto;
  text-align: center;
}

.footer-links {
  display: flex;
  justify-content: center;
  gap: var(--sp-lg);
  margin-bottom: var(--sp-md);
}

.footer-links a {
  font-size: 12px;
  color: var(--sub);
  letter-spacing: var(--tracking);
  transition: color 0.2s;
}

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

.footer-copy {
  font-size: 11px;
  color: var(--sub);
  opacity: 0.7;
  letter-spacing: var(--tracking);
}

/* ===== SCROLL ANIMATIONS ===== */
.section-inner,
.hero-inner {
  opacity: 0;
  transform: translateY(20px);
  transition: opacity 0.8s ease, transform 0.8s ease;
}

.section-inner.visible,
.hero-inner.visible {
  opacity: 1;
  transform: translateY(0);
}

/* ===== HAMBURGER MENU (mobile) ===== */
.menu-toggle {
  display: none;
  flex-direction: column;
  justify-content: center;
  gap: 5px;
  width: 32px;
  height: 32px;
  background: none;
  border: none;
  cursor: pointer;
  padding: 6px;
}

.menu-bar {
  display: block;
  width: 100%;
  height: 1.5px;
  background: var(--txt);
  transition: transform 0.3s ease, opacity 0.3s ease;
}

.menu-toggle[aria-expanded="true"] .menu-bar:first-child {
  transform: translateY(3.25px) rotate(45deg);
}

.menu-toggle[aria-expanded="true"] .menu-bar:last-child {
  transform: translateY(-3.25px) rotate(-45deg);
}

/* ===== RESPONSIVE ===== */
@media (max-width: 768px) {
  .menu-toggle {
    display: flex;
  }

  .nav {
    display: none;
    position: absolute;
    top: 48px;
    left: 0;
    right: 0;
    background: var(--bg);
    border-bottom: 1px solid var(--line);
    flex-direction: column;
    padding: var(--sp-md) var(--sp-lg);
    gap: var(--sp-md);
  }

  .nav.open {
    display: flex;
  }

  .nav-link {
    font-size: 14px;
  }

  .header-inner {
    height: 48px;
  }

  .hero {
    padding: var(--sp-2xl) var(--sp-md);
  }

  .hero-inner {
    flex-direction: column;
    gap: var(--sp-2xl);
    text-align: center;
    justify-content: center;
  }

  .hero-content {
    text-align: center;
    max-width: none;
  }

  .hero-badges {
    justify-content: center;
  }

  .iphone-frame {
    width: 240px;
    height: 498px;
  }

  .section {
    padding: var(--sp-2xl) var(--sp-md);
  }

  .examples-grid,
  .worldview-grid,
  .steps {
    grid-template-columns: 1fr;
    gap: var(--sp-md);
  }

  .worldview-visual {
    width: 96px;
    height: 96px;
  }

  .example-card {
    padding: var(--sp-md);
  }

  .screens-scroll {
    justify-content: flex-start;
    padding: var(--sp-lg) var(--sp-md);
    gap: var(--sp-lg);
  }

  .iphone-frame--sm {
    width: 150px;
    height: 311px;
  }

  .iphone-frame--sm img {
    border-radius: 24px;
  }
}

@media (max-width: 480px) {
  body {
    font-size: 14px;
  }

  .hero-title {
    font-size: 26px;
  }

  .section-title {
    font-size: 20px;
  }
}

/* ===== PREFERS COLOR SCHEME (initial state before JS loads) ===== */
@media (prefers-color-scheme: dark) {
  :root:not([data-theme="light"]) {
    --bg: #121311;
    --bg-alt: #1A1918;
    --txt: #C7BAAB;
    --sub: #807366;
    --accent: #999980;
    --star: #D1B884;
    --line: rgba(199, 186, 171, 0.12);
    --card-bg: rgba(199, 186, 171, 0.05);
    --card-border: rgba(199, 186, 171, 0.10);
    --btn-bg: rgba(199, 186, 171, 0.06);
    --btn-border: rgba(199, 186, 171, 0.15);
    --primary-bg: #C7BAAB;
    --primary-fg: #121311;
  }
}