/* ========================================
   MeetingBurn Landing Page - Styles
   ======================================== */

/* --- Custom Properties --- */
:root {
  --color-primary: #FF6B35;
  --color-secondary: #F7931E;
  --color-bg-peach: #FFEDDC;
  --color-bg-light-peach: #FFF8F3;
  --color-bg-gray: #F5F5F5;
  --color-text: #212121;
  --color-text-secondary: #757575;
  --color-text-light: #9E9E9E;
  --color-white: #FFFFFF;
  --color-dark: #1A1A1A;

  /* Burn levels */
  --burn-0: #FFFFFF;
  --burn-1: #FFF9E6;
  --burn-2: #FFE5B4;
  --burn-3: #FFB366;
  --burn-4: #FF6B35;
  --burn-5: #FF4444;

  --font-family: 'Noto Sans JP', -apple-system, BlinkMacSystemFont, sans-serif;
  --max-width: 1200px;
  --header-height: 64px;
  --radius: 16px;
  --radius-sm: 8px;
  --shadow: 0 4px 24px rgba(0,0,0,0.08);
  --shadow-lg: 0 8px 40px rgba(0,0,0,0.12);
  --transition: 0.3s ease;
}

/* --- Reset --- */
*, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }
html { scroll-behavior: smooth; scroll-padding-top: var(--header-height); }
body {
  font-family: var(--font-family);
  color: var(--color-text);
  line-height: 1.8;
  font-size: 16px;
  -webkit-font-smoothing: antialiased;
  overflow-x: hidden;
}
img { max-width: 100%; height: auto; display: block; }
a { color: inherit; text-decoration: none; }
button { cursor: pointer; border: none; background: none; font-family: inherit; }

/* --- Utility --- */
.container {
  max-width: var(--max-width);
  margin: 0 auto;
  padding: 0 24px;
}
.text-primary { color: var(--color-primary); }
.sp-only { display: none; }

/* --- Animations --- */
.fade-in {
  opacity: 0;
  transform: translateY(30px);
  transition: opacity 0.6s ease, transform 0.6s ease;
}
.fade-in.visible {
  opacity: 1;
  transform: translateY(0);
}

/* ========== HEADER ========== */
.header {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  z-index: 100;
  background: rgba(255, 255, 255, 0.95);
  backdrop-filter: blur(10px);
  -webkit-backdrop-filter: blur(10px);
  border-bottom: 1px solid rgba(0,0,0,0.06);
  height: var(--header-height);
}
.header-inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: 100%;
}
.logo {
  display: flex;
  align-items: center;
  gap: 10px;
  font-weight: 700;
  font-size: 18px;
}
.logo-icon { border-radius: 8px; }
.nav { display: flex; align-items: center; gap: 32px; }
.nav-link {
  font-size: 14px;
  font-weight: 700;
  color: var(--color-text-secondary);
  transition: color var(--transition);
}
.nav-link:hover { color: var(--color-primary); }
.nav-link--cta {
  background: var(--color-primary);
  color: var(--color-white) !important;
  padding: 8px 20px;
  border-radius: 24px;
  font-size: 13px;
}
.nav-link--cta:hover { opacity: 0.9; }
.hamburger { display: none; flex-direction: column; gap: 5px; padding: 4px; }
.hamburger span {
  display: block;
  width: 24px;
  height: 2px;
  background: var(--color-text);
  transition: var(--transition);
  border-radius: 2px;
}

/* ========== HERO ========== */
.hero {
  padding-top: calc(var(--header-height) + 60px);
  padding-bottom: 80px;
  background: linear-gradient(180deg, var(--color-white) 0%, var(--color-bg-peach) 100%);
  min-height: 100vh;
  display: flex;
  align-items: center;
}
.hero-inner {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 48px;
  align-items: center;
}
.hero-icon { border-radius: 20px; margin-bottom: 20px; }
.hero-title {
  font-size: 48px;
  font-weight: 900;
  line-height: 1.3;
  letter-spacing: -0.02em;
  margin-bottom: 20px;
}
.hero-sub {
  font-size: 18px;
  color: var(--color-text-secondary);
  margin-bottom: 32px;
  line-height: 1.8;
}
.hero-badges {
  display: flex;
  gap: 16px;
  flex-wrap: wrap;
}
.badge-link { display: inline-block; transition: transform var(--transition); }
.badge-link:hover { transform: scale(1.05); }
.badge-img { height: 48px; width: auto; }
.badge-img--large { height: 56px; }
.hero-visual { display: flex; justify-content: center; }
.hero-screenshot {
  max-height: 600px;
  width: auto;
  border-radius: 12px;
  filter: drop-shadow(0 20px 60px rgba(0,0,0,0.15));
}

/* ========== SECTIONS ========== */
.section {
  padding: 100px 0;
}
.section--gray { background: var(--color-bg-gray); }
.section--peach { background: var(--color-bg-light-peach); }
.section-title {
  text-align: center;
  font-size: 36px;
  font-weight: 900;
  margin-bottom: 16px;
  letter-spacing: -0.02em;
}
.section-sub {
  text-align: center;
  color: var(--color-text-secondary);
  font-size: 16px;
  margin-bottom: 48px;
}

/* --- Grid --- */
.grid-3 {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 24px;
}
.grid-2 {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 24px;
}

/* --- Cards (Pain Points) --- */
.pain-cards { margin-top: 48px; }
.card {
  background: var(--color-white);
  border-radius: var(--radius);
  padding: 40px 32px;
  text-align: center;
  box-shadow: var(--shadow);
  transition: transform var(--transition);
}
.card:hover { transform: translateY(-4px); }
.card-icon {
  color: var(--color-primary);
  margin-bottom: 20px;
}
.card-title {
  font-size: 20px;
  font-weight: 700;
  margin-bottom: 12px;
}
.card-text {
  color: var(--color-text-secondary);
  font-size: 15px;
}

/* --- Features --- */
.feature-row {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 64px;
  align-items: center;
  margin-bottom: 80px;
}
.feature-row:last-child { margin-bottom: 0; }
.feature-row--reverse .feature-visual { order: 2; }
.feature-row--reverse .feature-text { order: 1; }
.feature-screenshot {
  max-height: 500px;
  width: auto;
  margin: 0 auto;
  border-radius: 12px;
  filter: drop-shadow(0 12px 40px rgba(0,0,0,0.1));
}
.feature-label {
  display: inline-block;
  font-size: 12px;
  font-weight: 700;
  color: var(--color-primary);
  letter-spacing: 0.1em;
  margin-bottom: 12px;
}
.feature-title {
  font-size: 28px;
  font-weight: 900;
  margin-bottom: 16px;
  line-height: 1.4;
}
.feature-desc {
  color: var(--color-text-secondary);
  font-size: 15px;
  line-height: 1.9;
}

/* --- Steps --- */
.steps {
  display: flex;
  align-items: flex-start;
  justify-content: center;
  gap: 16px;
  margin-top: 48px;
}
.step {
  text-align: center;
  flex: 1;
  max-width: 300px;
}
.step-number {
  width: 48px;
  height: 48px;
  border-radius: 50%;
  background: var(--color-primary);
  color: var(--color-white);
  font-size: 22px;
  font-weight: 900;
  display: flex;
  align-items: center;
  justify-content: center;
  margin: 0 auto 20px;
}
.step-img {
  max-height: 360px;
  width: auto;
  margin: 0 auto 16px;
  border-radius: 10px;
  filter: drop-shadow(0 8px 24px rgba(0,0,0,0.1));
}
.step-title {
  font-size: 18px;
  font-weight: 700;
  margin-bottom: 8px;
}
.step-text {
  font-size: 14px;
  color: var(--color-text-secondary);
}
.step-arrow {
  display: flex;
  align-items: center;
  padding-top: 200px;
}

/* --- Demo --- */
.demo-section {
  background: linear-gradient(180deg, var(--color-white) 0%, var(--color-bg-light-peach) 100%);
}
.demo-box {
  max-width: 480px;
  margin: 0 auto;
  background: var(--color-white);
  border-radius: var(--radius);
  padding: 40px;
  box-shadow: var(--shadow-lg);
  text-align: center;
  transition: background-color 0.8s ease;
}
.demo-participants {
  margin-bottom: 24px;
}
.demo-label {
  font-size: 14px;
  font-weight: 700;
  color: var(--color-text-secondary);
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 12px;
}
.demo-label select {
  font-family: var(--font-family);
  font-size: 14px;
  padding: 8px 16px;
  border: 2px solid #E0E0E0;
  border-radius: var(--radius-sm);
  background: var(--color-white);
  color: var(--color-text);
  cursor: pointer;
}
.demo-timer {
  font-size: 24px;
  font-weight: 700;
  color: var(--color-text-secondary);
  margin-bottom: 8px;
  font-variant-numeric: tabular-nums;
}
.demo-cost {
  font-size: 56px;
  font-weight: 900;
  color: var(--color-text);
  margin-bottom: 8px;
  font-variant-numeric: tabular-nums;
  transition: color 0.8s ease;
}
.demo-level {
  font-size: 14px;
  font-weight: 700;
  padding: 4px 16px;
  border-radius: 20px;
  display: inline-block;
  margin-bottom: 24px;
  background: #E8F5E9;
  color: #388E3C;
  transition: background-color 0.8s ease, color 0.8s ease;
}
.demo-controls {
  display: flex;
  gap: 12px;
  justify-content: center;
}
.btn {
  padding: 14px 40px;
  border-radius: 28px;
  font-size: 16px;
  font-weight: 700;
  transition: all var(--transition);
}
.btn--primary {
  background: var(--color-primary);
  color: var(--color-white);
}
.btn--primary:hover { opacity: 0.9; transform: scale(1.03); }
.btn--outline {
  border: 2px solid #E0E0E0;
  color: var(--color-text-secondary);
  background: var(--color-white);
}
.btn--outline:hover { border-color: var(--color-primary); color: var(--color-primary); }
.btn:disabled { opacity: 0.4; cursor: not-allowed; transform: none; }

/* --- Use Cases --- */
.usecase-card {
  background: var(--color-white);
  border-radius: var(--radius);
  padding: 32px;
  box-shadow: var(--shadow);
  transition: transform var(--transition);
}
.usecase-card:hover { transform: translateY(-4px); }
.usecase-icon {
  color: var(--color-primary);
  margin-bottom: 16px;
}
.usecase-title {
  font-size: 18px;
  font-weight: 700;
  margin-bottom: 12px;
}
.usecase-text {
  font-size: 14px;
  color: var(--color-text-secondary);
  line-height: 1.8;
}

/* --- Icon Cards (More Features) --- */
.feature-icons { margin-top: 48px; }
.icon-card {
  text-align: center;
  padding: 32px 16px;
}
.icon-card svg { margin: 0 auto 16px; }
.icon-card h4 {
  font-size: 16px;
  font-weight: 700;
  margin-bottom: 8px;
}
.icon-card p {
  font-size: 14px;
  color: var(--color-text-secondary);
}

/* --- CTA --- */
.cta-section {
  background: linear-gradient(135deg, var(--color-primary) 0%, var(--burn-5) 100%);
  text-align: center;
  color: var(--color-white);
}
.cta-title {
  font-size: 40px;
  font-weight: 900;
  line-height: 1.4;
  margin-bottom: 16px;
}
.cta-title span {
  text-decoration: underline;
  text-decoration-thickness: 3px;
  text-underline-offset: 6px;
}
.cta-sub {
  font-size: 18px;
  opacity: 0.9;
  margin-bottom: 40px;
}
.cta-badges {
  display: flex;
  gap: 20px;
  justify-content: center;
  flex-wrap: wrap;
  margin-bottom: 24px;
}
.cta-hashtag {
  font-size: 14px;
  opacity: 0.7;
}

/* --- Footer --- */
.footer {
  background: var(--color-dark);
  color: rgba(255,255,255,0.7);
  padding: 48px 0;
  text-align: center;
}
.footer-inner { display: flex; flex-direction: column; align-items: center; gap: 16px; }
.footer-brand {
  display: flex;
  align-items: center;
  gap: 10px;
  color: var(--color-white);
  font-weight: 700;
  font-size: 18px;
}
.footer-brand img { border-radius: 8px; }
.footer-tagline { font-size: 14px; opacity: 0.6; }
.footer-links { display: flex; gap: 24px; }
.footer-links a {
  font-size: 14px;
  transition: color var(--transition);
}
.footer-links a:hover { color: var(--color-primary); }
.footer-copy {
  font-size: 12px;
  opacity: 0.5;
  margin-top: 8px;
}

/* ========================================
   RESPONSIVE
   ======================================== */

@media (max-width: 1023px) {
  .hero-inner {
    grid-template-columns: 1fr;
    text-align: center;
  }
  .hero-badges { justify-content: center; }
  .hero-title { font-size: 36px; }
  .hero-screenshot { max-height: 450px; }
  .feature-row {
    grid-template-columns: 1fr;
    gap: 32px;
    text-align: center;
  }
  .feature-row--reverse .feature-visual { order: 0; }
  .feature-row--reverse .feature-text { order: 0; }
  .feature-screenshot { max-height: 400px; }
}

@media (max-width: 767px) {
  .sp-only { display: inline; }
  .nav { display: none; }
  .nav.open {
    display: flex;
    flex-direction: column;
    position: fixed;
    top: var(--header-height);
    left: 0;
    right: 0;
    background: rgba(255,255,255,0.98);
    backdrop-filter: blur(10px);
    padding: 24px;
    gap: 16px;
    border-bottom: 1px solid rgba(0,0,0,0.06);
    animation: slideDown 0.3s ease;
  }
  @keyframes slideDown {
    from { opacity: 0; transform: translateY(-10px); }
    to { opacity: 1; transform: translateY(0); }
  }
  .hamburger { display: flex; }

  .hero {
    padding-top: calc(var(--header-height) + 40px);
    padding-bottom: 60px;
    min-height: auto;
  }
  .hero-title { font-size: 28px; }
  .hero-sub { font-size: 15px; }
  .hero-icon { width: 60px; height: 60px; }
  .hero-screenshot { max-height: 350px; }
  .badge-img { height: 40px; }
  .badge-img--large { height: 48px; }

  .section { padding: 64px 0; }
  .section-title { font-size: 26px; }

  .grid-3 { grid-template-columns: 1fr; }
  .grid-2 { grid-template-columns: 1fr; }

  .steps {
    flex-direction: column;
    align-items: center;
  }
  .step-arrow {
    padding-top: 0;
    transform: rotate(90deg);
  }
  .step-img { max-height: 280px; }

  .feature-title { font-size: 22px; }
  .feature-row { margin-bottom: 48px; }

  .demo-cost { font-size: 40px; }
  .demo-box { padding: 24px; }

  .cta-title { font-size: 28px; }
  .cta-sub { font-size: 16px; }
}