:root {
  --color-bg-light: #edebe7;
  --color-primary: #182740;
  --color-secondary: #8c7a5a;  
  --container-max: 1200px;
  --container-pad: clamp(1rem, 4vw, 2rem);
}

* {
  box-sizing: border-box;
}

html {
  -webkit-text-size-adjust: 100%;
}

body {
  margin: 0;
  font-family: "Zen Old Mincho", serif;
  color: var(--color-primary);
  line-height: 1.6;
  -webkit-font-smoothing: antialiased;
}

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

.container {
  width: 100%;
  max-width: var(--container-max);
  margin-inline: auto;
  padding-inline: var(--container-pad);
}

@media (prefers-reduced-motion: reduce) {
  * {
    animation-duration: 0.001ms !important;
    transition-duration: 0.001ms !important;
  }
}

/* ==========================================================================
   Hero / ファーストビュー
   ========================================================================== */
.hero {
  background: var(--color-bg-light);
  padding-block: clamp(1.75rem, 3.5vw, 2rem) clamp(2.5rem, 6vw, 3rem);
}

/* Logo */
.logo {
  padding: 0 clamp(2rem, 5vw, 4rem) 0;
}

.logo img {
  width: clamp(100px, 12vw, 150px);
  height: auto;
}

/* Hero body: text + illustration */
.hero__body {
  display: flex;
  flex-wrap: wrap-reverse;
  align-items: center;
  gap: clamp(2rem, 5vw, 3.5rem);
}

.hero__text {
  flex: 1 1 420px;
}

.hero__illust {
  flex: 1 1 380px;
  max-width: 560px;
  margin-inline: auto;
}

@media (max-width: 938px) {
  .hero__illust {
    max-width: 240px;
  }
}

.eyebrow {
  margin: 0 0 0.9rem;
  font-weight: 500;
  font-size: clamp(0.95rem, 1vw + 0.5rem, 1.15rem);
  color: var(--color-secondary);
}

.headline {
  margin: 0 0 1.25rem;
  display: flex;
  flex-direction: column;
  font-weight: 900;
  font-size: clamp(2rem, 1.273rem + 3.64vw, 4rem);
  font-feature-settings: "palt";
  line-height: 1.25;
  color: var(--color-primary);
  letter-spacing: 0.01em;
}

.lead {
  margin: 0;
  max-width: 46ch;
  font-weight: 600;
  font-size: clamp(0.95rem, 0.4vw + 0.85rem, 1.1rem);
  color: rgba(26, 32, 44, 0.8);
}

/* ==========================================================================
   Demo section / 本編セクション
   ========================================================================== */
.demo {
  background: #182740;
  background: linear-gradient(0deg, rgba(24, 39, 64, 1) 85%, rgba(32, 52, 85, 1) 100%);
  padding-block: clamp(2.5rem, 6vw, 4.5rem);
  
}

.demo__grid {
  /* 中身の幅を90%にして、3つの高さを10%小さくする */
  width: calc((min(100%, var(--container-max)) - 2 * var(--container-pad)) * 0.9 + 2 * var(--container-pad));
  /* PDF(A4縦 595:842)と動画(9:16)の高さが揃う比率: 1 : 0.796 */
  display: grid;
  grid-template-columns: 1fr 0.796fr 0.9fr;
  align-items: stretch;
  gap: clamp(1rem, 2.5vw, 2.5rem);
}

.demo__col {
  display: flex;
  flex-direction: column;
  gap: 0.75rem;
  min-width: 0;
}

.demo__video,
.demo__pdf {
  width: 100%;
}

.demo__video {
  position: relative;
  aspect-ratio: 9 / 16;
}

.demo__video video {
  width: 100%;
  height: 100%;
  display: block;
  border-radius: 12px;
  background: #e4e7ec;
  object-fit: cover;
  outline: none;
}

.demo__pdf {
  position: relative;
  aspect-ratio: 595 / 842;
  display: block;
  cursor: pointer;
  border-radius: 12px;
  overflow: hidden;
  background: #ffffff;
  box-shadow: 0 12px 28px rgba(0, 0, 0, 0.18);
  transition: transform 0.15s ease, filter 0.15s ease;
}

.demo__pdf img {
  width: 100%;
  height: 100%;
  display: block;
  object-fit: cover;
}

.demo__pdf:hover,
.demo__pdf:focus-visible {
  transform: translateY(-3px);
  filter: brightness(1.04);
}

/* 動画の再生ボタン */
.demo__play {
  position: absolute;
  inset: 0;
  padding: 0;
  border: none;
  border-radius: 12px;
  background: rgba(24, 39, 64, 0.35);
  font-family: inherit;
  cursor: pointer;
  transition: background 0.15s ease;
}

.demo__play[hidden] {
  display: none;
}

.demo__play:hover,
.demo__play:focus-visible {
  background: rgba(24, 39, 64, 0.2);
}

.demo__play-icon {
  position: absolute;
  top: 50%;
  left: 50%;
  display: grid;
  place-items: center;
  width: 72px;
  height: 72px;
  transform: translate(-50%, -50%);
  border-radius: 50%;
  background: #ffffff;
  color: #A18F6D;
  font-size: 1.6rem;
  box-shadow: 0 6px 16px rgba(0, 0, 0, 0.3);
}

.demo__play-icon i {
  margin-left: 4px;
}

.demo__pdf-button {
  position: absolute;
  top: 50%;
  left: 50%;
  transform: translate(-50%, -50%);
  padding: 1rem 1.75rem;
  border-radius: 999px;
  background: linear-gradient(180deg, rgba(161, 143, 109, 1) 85%, rgba(140, 122, 90, 1) 100%);
  color: #ffffff;
  font-weight: 700;
  font-size: clamp(1.1rem, 1.6vw, 1.4rem);
  white-space: nowrap;
  box-shadow: 0 8px 20px rgba(0, 0, 0, 0.35);
}

.demo__qr {
  flex: 1 1 auto;
  display: flex;
  flex-direction: column;
  justify-content: center;
  background: #ffffff;
  border-radius: 16px;
  padding: clamp(1.5rem, 2.5vw, 2rem) clamp(1rem, 2vw, 1rem);
  text-align: center;
  box-shadow: 0 12px 28px rgba(0, 0, 0, 0.18);
}

.demo__qr-note {
  margin: 0;
  font-size: 0.75rem;
  line-height: 1.5;
}

/* QR列の中身の高さを行の高さに含めず、PDF・動画の高さに揃える */
@media (min-width: 768px) {
  .demo__col--qr {
    contain: size;
  }
}

@media (max-width: 767px) {
  .demo__grid {
    width: 100%;
    grid-template-columns: minmax(0, 1fr);
    justify-items: center;
  }

  .demo__col {
    width: min(100%, 320px);
  }

}

.demo__qr-text {
  margin: 0 0 0.5rem;
  font-weight: 900;
  font-size: clamp(1rem, 0.4vw + 0.9rem, 1.15rem);
  color: var(--color-secondary);
  line-height: 1.5;
}

.demo__qr-code {
  width: min(100%, 200px);
  margin-inline: auto;
  padding: 0.6rem;
  filter: drop-shadow(0 0 10px rgba(0, 0, 0, 0.12));
}

.demo__qr-code img {
  width: 100%;
  height: auto;
}

.demo__qr-button {
  display: block;
  width: 100%;
  margin: 0 0 1.25rem;
  padding: 0.85rem 1.5rem;
  border: none;
  border-radius: 8px;
  background: #A18F6D;
  background: linear-gradient(180deg, rgba(161, 143, 109, 1) 85%, rgba(140, 122, 90, 1) 100%);
  color: #ffffff;
  font-family: inherit;
  font-weight: 700;
  font-size: clamp(0.9rem, 0.733rem + 1.02vw, 1.2rem);
  text-align: center;
  text-decoration: none;
  cursor: pointer;
  transition: filter 0.15s ease;
}
 
.demo__qr-button:hover,
.demo__qr-button:focus-visible {
  filter: brightness(1.08);
}