/* =========================================================
   AIの窓口 for Business — Hero Section
   "Stratus Tenderness" Visual Philosophy
   ========================================================= */

/* ─── Reset & Base ─────────────────────────────────────── */
*,
*::before,
*::after {
  box-sizing: border-box;
  margin: 0;
  padding: 0;
}

:root {
  /* Color Palette — そらの世界観に合わせた水彩パステル */
  --sky-top:        #B6D4E5;  /* 上部の空色 */
  --sky-upper:      #C7D8E8;  /* 上中域 ふんわり青 */
  --sky-mid:        #E8D8E2;  /* 中央 ピンクラベンダー */
  --sky-lower:      #FAD4D0;  /* 下中域 桃色 */
  --sky-bottom:     #FCE5D5;  /* 最下部 クリームピーチ */
  --pearl:          #F1FAEE;
  --gold:           #F4D35E;
  --gold-deep:      #D2A537;
  --peach:          #FCD5CE;
  --peach-warm:     #FAC8AC;
  --deep-sky:       #1D3557;
  --soft-ink:       #4B6482;
  --whisper:        #8FA8BC;

  /* Typography */
  --serif-jp:  "Noto Serif JP", "Yu Mincho", "游明朝", serif;
  --sans-jp:   "Noto Sans JP", "Yu Gothic", "游ゴシック", sans-serif;
  --serif-lat: "Cormorant Garamond", serif;

  /* Layout */
  --container-max: 1280px;
  --header-h: 80px;
  --radius-soft: 24px;
  --radius-pill: 999px;
}

html {
  scroll-behavior: smooth;
}

body {
  font-family: var(--sans-jp);
  font-weight: 400;
  color: var(--deep-sky);
  background:
    /* 上部の柔らかい光（夕焼け感） */
    radial-gradient(ellipse 1200px 600px at 70% 0%, rgba(255, 235, 215, 0.5), transparent 70%),
    /* 左下の柔らかいピンク */
    radial-gradient(ellipse 800px 500px at 0% 90%, rgba(252, 213, 206, 0.55), transparent 70%),
    /* 右下の柔らかい青紫 */
    radial-gradient(ellipse 900px 600px at 100% 100%, rgba(200, 215, 235, 0.6), transparent 70%),
    /* 中央の温かい光 */
    radial-gradient(ellipse 1000px 800px at 50% 50%, rgba(255, 245, 230, 0.4), transparent 65%),
    /* ベースのグラデーション */
    linear-gradient(
      to bottom,
      var(--sky-top) 0%,
      var(--sky-upper) 22%,
      var(--sky-mid) 50%,
      var(--sky-lower) 78%,
      var(--sky-bottom) 100%
    );
  background-attachment: fixed;
  min-height: 100vh;
  overflow-x: hidden;
  line-height: 1.7;
  letter-spacing: 0.02em;
}

a {
  color: inherit;
  text-decoration: none;
  transition: opacity 0.2s ease, color 0.2s ease;
}

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

/* =========================================================
   ─── 背景：雲が流れる空 ──────────────────────────────────
   ========================================================= */

.sky {
  position: fixed;
  inset: 0;
  z-index: -1;
  pointer-events: none;
  overflow: hidden;
}

/* 水彩紙テクスチャ — そらの絵と同じ質感 */
.sky::before {
  content: '';
  position: absolute;
  inset: 0;
  background-image:
    /* 細かい紙のテクスチャ */
    radial-gradient(circle at 20% 30%, rgba(255, 255, 255, 0.04) 0%, transparent 1.5%),
    radial-gradient(circle at 80% 60%, rgba(255, 255, 255, 0.04) 0%, transparent 1.5%),
    radial-gradient(circle at 45% 75%, rgba(255, 255, 255, 0.03) 0%, transparent 1.5%),
    radial-gradient(circle at 65% 25%, rgba(255, 255, 255, 0.04) 0%, transparent 1.5%);
  background-size: 80px 80px, 100px 100px, 70px 70px, 90px 90px;
  mix-blend-mode: overlay;
  opacity: 0.7;
}

/* 水彩のにじみ — 角にふんわり色を散らす */
.sky::after {
  content: '';
  position: absolute;
  inset: 0;
  background:
    radial-gradient(ellipse 600px 400px at 5% 15%, rgba(180, 200, 230, 0.25), transparent 60%),
    radial-gradient(ellipse 500px 350px at 95% 85%, rgba(252, 213, 206, 0.3), transparent 60%),
    radial-gradient(ellipse 400px 300px at 95% 10%, rgba(255, 230, 200, 0.25), transparent 60%);
  filter: blur(1px);
}

/* 星のキラキラ */
.stars { position: absolute; inset: 0; }

.star {
  position: absolute;
  top: var(--top);
  left: var(--left);
  width: 4px;
  height: 4px;
  background: #FFFFFF;
  border-radius: 50%;
  box-shadow: 0 0 8px 2px rgba(255, 255, 255, 0.8),
              0 0 16px 4px rgba(244, 211, 94, 0.3);
  opacity: 0;
  animation: twinkle 4s ease-in-out infinite;
  animation-delay: var(--delay, 0s);
}

@keyframes twinkle {
  0%, 100% { opacity: 0; transform: scale(0.6); }
  50%      { opacity: 0.95; transform: scale(1.2); }
}

/* 水彩風の雲（SVG） */
.watercolor-cloud {
  position: absolute;
  pointer-events: none;
  filter: blur(0.8px);
}

.cloud-wc-1 {
  top: 5%;  left: -10%;
  width: 540px; height: auto;
  opacity: 0.85;
  animation: drift 95s linear infinite;
}
.cloud-wc-2 {
  top: 18%; left: 35%;
  width: 620px; height: auto;
  opacity: 0.75;
  animation: drift 110s linear infinite -30s;
}
.cloud-wc-3 {
  top: 32%; left: 75%;
  width: 460px; height: auto;
  opacity: 0.85;
  animation: drift 85s linear infinite -50s;
}
.cloud-wc-4 {
  top: 50%; left: -15%;
  width: 580px; height: auto;
  opacity: 0.78;
  animation: drift 120s linear infinite -60s;
}
.cloud-wc-5 {
  top: 68%; left: 55%;
  width: 420px; height: auto;
  opacity: 0.88;
  animation: drift 75s linear infinite -20s;
}
.cloud-wc-6 {
  top: 82%; left: 10%;
  width: 520px; height: auto;
  opacity: 0.8;
  animation: drift 100s linear infinite -40s;
}

/* 雲レイヤー */
.cloud-layer {
  position: absolute;
  inset: 0;
}

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

/* 奥の雲：青みがかったふんわり */
.cloud-back-1 {
  top: 10%; left: -15%; width: 520px; height: 200px; opacity: 0.6;
  background: radial-gradient(ellipse at center,
    rgba(220, 235, 250, 0.85) 0%,
    rgba(255, 240, 240, 0.5) 45%,
    transparent 75%);
  filter: blur(3px);
  animation: drift 100s linear infinite;
}
.cloud-back-2 {
  top: 35%; left: 50%; width: 580px; height: 220px; opacity: 0.55;
  background: radial-gradient(ellipse at center,
    rgba(240, 220, 235, 0.85) 0%,
    rgba(255, 230, 230, 0.45) 45%,
    transparent 75%);
  filter: blur(3px);
  animation: drift 120s linear infinite -50s;
}
.cloud-back-3 {
  top: 65%; left: -10%; width: 660px; height: 240px; opacity: 0.55;
  background: radial-gradient(ellipse at center,
    rgba(255, 220, 215, 0.85) 0%,
    rgba(255, 240, 230, 0.5) 45%,
    transparent 75%);
  filter: blur(3px);
  animation: drift 140s linear infinite -70s;
}

/* 中景の雲：白と桃の混ざる */
.cloud-mid-1 {
  top: 20%; left: 22%; width: 360px; height: 150px; opacity: 0.85;
  background: radial-gradient(ellipse at center,
    rgba(255, 255, 255, 0.95) 0%,
    rgba(245, 230, 235, 0.6) 50%,
    transparent 78%);
  filter: blur(1.5px);
  animation: drift 75s linear infinite -10s;
}
.cloud-mid-2 {
  top: 52%; left: 70%; width: 400px; height: 160px; opacity: 0.78;
  background: radial-gradient(ellipse at center,
    rgba(255, 245, 245, 0.92) 0%,
    rgba(252, 213, 206, 0.45) 50%,
    transparent 78%);
  filter: blur(1.5px);
  animation: drift 85s linear infinite -35s;
}
.cloud-mid-3 {
  top: 78%; left: 28%; width: 340px; height: 140px; opacity: 0.75;
  background: radial-gradient(ellipse at center,
    rgba(255, 250, 245, 0.92) 0%,
    rgba(250, 220, 215, 0.5) 50%,
    transparent 78%);
  filter: blur(1.5px);
  animation: drift 80s linear infinite -55s;
}

/* 手前の雲：くっきり */
.cloud-front-1 {
  top: 72%; left: -18%; width: 260px; height: 115px; opacity: 0.95;
  background: radial-gradient(ellipse at center,
    rgba(255, 255, 255, 0.98) 0%,
    rgba(245, 235, 240, 0.65) 50%,
    transparent 80%);
  filter: blur(0.8px);
  animation: drift 55s linear infinite;
}
.cloud-front-2 {
  top: 85%; left: 62%; width: 300px; height: 125px; opacity: 0.92;
  background: radial-gradient(ellipse at center,
    rgba(255, 252, 248, 0.98) 0%,
    rgba(252, 220, 215, 0.55) 50%,
    transparent 80%);
  filter: blur(0.8px);
  animation: drift 60s linear infinite -25s;
}

@keyframes drift {
  0%   { transform: translateX(0); }
  100% { transform: translateX(140vw); }
}

/* =========================================================
   ─── ヘッダー ──────────────────────────────────────────
   ========================================================= */

.site-header {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  height: var(--header-h);
  padding: 0 max(24px, 4vw);
  display: flex;
  align-items: center;
  justify-content: space-between;
  z-index: 100;
  background: linear-gradient(to bottom, rgba(255, 255, 255, 0.4), rgba(255, 255, 255, 0));
  backdrop-filter: blur(10px);
  -webkit-backdrop-filter: blur(10px);
}

.brand {
  display: flex;
  align-items: center;
  gap: 14px;
}

.brand-logo {
  width: 44px;
  height: 44px;
  border-radius: 50%;
  background:
    radial-gradient(circle at 35% 35%, var(--gold) 0%, transparent 35%),
    radial-gradient(circle at 50% 60%, #FFF 0%, var(--peach) 60%, transparent 70%),
    radial-gradient(circle at 50% 50%, #FFF 0%, #DCE8EE 60%, var(--sky-top) 100%);
  box-shadow: 0 4px 16px rgba(168, 218, 220, 0.4), inset 0 0 12px rgba(255, 255, 255, 0.7);
}

.brand-text {
  display: flex;
  flex-direction: column;
  line-height: 1.1;
}

.brand-name {
  font-family: var(--serif-jp);
  font-weight: 500;
  font-size: 18px;
  color: var(--deep-sky);
  letter-spacing: 0.06em;
}

.brand-sub {
  font-family: var(--serif-lat);
  font-style: italic;
  font-size: 12px;
  color: var(--soft-ink);
  letter-spacing: 0.15em;
  margin-top: 2px;
}

.site-nav {
  display: flex;
  align-items: center;
  gap: 28px;
}

.site-nav a {
  font-size: 14px;
  font-weight: 500;
  color: var(--soft-ink);
  letter-spacing: 0.05em;
}

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

.nav-cta {
  padding: 10px 22px;
  background: linear-gradient(135deg, var(--gold), var(--peach));
  color: var(--deep-sky) !important;
  border-radius: var(--radius-pill);
  box-shadow: 0 4px 16px rgba(244, 211, 94, 0.4);
  font-weight: 700 !important;
}

.nav-cta:hover {
  transform: translateY(-1px);
  box-shadow: 0 6px 20px rgba(244, 211, 94, 0.55);
}

/* =========================================================
   ─── ヒーローセクション ───────────────────────────────
   ========================================================= */

.hero {
  min-height: 110vh;
  padding: calc(var(--header-h) + 20px) max(24px, 4vw) 60px;
  display: flex;
  flex-direction: column;
  justify-content: center;
  align-items: center;
  position: relative;
  overflow: visible;
}

.hero-grid {
  width: 100%;
  max-width: var(--container-max);
  display: grid;
  grid-template-columns: 0.9fr 1.3fr;
  gap: 30px;
  align-items: center;
}

/* ── 左：コピー領域 ── */
.hero-copy {
  display: flex;
  flex-direction: column;
  gap: 28px;
  animation: fadeInUp 1.2s ease 0.2s both;
}

.hero-eyebrow {
  font-family: var(--serif-lat);
  font-size: 14px;
  letter-spacing: 0.4em;
  color: var(--soft-ink);
  text-transform: uppercase;
  font-style: italic;
}

.hero-headline {
  font-family: var(--serif-jp);
  font-weight: 500;
  font-size: clamp(32px, 4.8vw, 64px);
  line-height: 1.25;
  letter-spacing: 0.04em;
  color: var(--deep-sky);
  white-space: nowrap;
}

.hero-headline .line {
  display: block;
}

.hero-headline .line-emphasis {
  background: linear-gradient(135deg, var(--deep-sky) 0%, var(--gold-deep) 70%, var(--gold) 100%);
  -webkit-background-clip: text;
  background-clip: text;
  -webkit-text-fill-color: transparent;
  font-weight: 700;
}

.hero-sub {
  font-family: var(--serif-jp);
  font-size: clamp(16px, 1.4vw, 19px);
  font-weight: 400;
  color: var(--soft-ink);
  letter-spacing: 0.15em;
}

.hero-lead {
  font-size: clamp(14px, 1.1vw, 16px);
  color: var(--soft-ink);
  line-height: 1.95;
  letter-spacing: 0.04em;
  font-weight: 400;
}

/* CTAボタン群 */
.hero-cta-group {
  display: flex;
  align-items: center;
  gap: 24px;
  flex-wrap: wrap;
  margin-top: 8px;
}

.cta-primary {
  position: relative;
  display: inline-flex;
  flex-direction: column;
  padding: 18px 36px;
  background: linear-gradient(135deg, #FFFFFF 0%, var(--peach) 60%, var(--gold) 100%);
  color: var(--deep-sky);
  border-radius: var(--radius-pill);
  font-weight: 700;
  letter-spacing: 0.08em;
  box-shadow:
    0 8px 28px rgba(244, 211, 94, 0.35),
    0 2px 8px rgba(252, 213, 206, 0.4),
    inset 0 0 0 1px rgba(255, 255, 255, 0.6);
  transition: all 0.3s ease;
  overflow: hidden;
}

.cta-primary::before {
  content: '';
  position: absolute;
  inset: 0;
  background: radial-gradient(circle at 50% 0%, rgba(255, 255, 255, 0.6), transparent 60%);
  opacity: 0;
  transition: opacity 0.3s ease;
}

.cta-primary:hover {
  transform: translateY(-3px);
  box-shadow:
    0 14px 40px rgba(244, 211, 94, 0.5),
    0 4px 12px rgba(252, 213, 206, 0.5),
    inset 0 0 0 1px rgba(255, 255, 255, 0.8);
}

.cta-primary:hover::before { opacity: 1; }

.cta-label {
  font-size: 17px;
}

.cta-meta {
  font-size: 11px;
  opacity: 0.7;
  letter-spacing: 0.15em;
  font-weight: 400;
  margin-top: 2px;
}

.cta-arrow {
  position: absolute;
  right: 22px;
  top: 50%;
  transform: translateY(-50%);
  font-size: 22px;
  font-weight: 300;
  transition: transform 0.3s ease;
}

.cta-primary:hover .cta-arrow {
  transform: translateY(-50%) translateX(6px);
}

.cta-secondary {
  font-size: 14px;
  color: var(--soft-ink);
  letter-spacing: 0.1em;
  border-bottom: 1px solid currentColor;
  padding-bottom: 4px;
}

.cta-secondary:hover {
  color: var(--deep-sky);
}

.hero-trust {
  list-style: none;
  display: flex;
  flex-wrap: wrap;
  gap: 20px;
  margin-top: 16px;
  font-size: 12px;
  color: var(--whisper);
  letter-spacing: 0.08em;
}

/* ── 右：そら立ち絵 ── */
.sora-stage {
  position: relative;
  display: flex;
  flex-direction: column;
  align-items: center;
  animation: fadeIn 1.6s ease 0.6s both;
}

.sora-halo {
  position: absolute;
  top: 50%;
  left: 50%;
  transform: translate(-50%, -50%);
  width: 130%;
  height: 130%;
  background:
    radial-gradient(circle at 50% 30%, rgba(255, 245, 230, 0.7) 0%, transparent 50%),
    radial-gradient(circle at 50% 70%, rgba(252, 213, 206, 0.5) 0%, transparent 55%),
    radial-gradient(circle at center, rgba(220, 235, 250, 0.4) 0%, transparent 65%);
  filter: blur(50px);
  z-index: 0;
  animation: haloPulse 7s ease-in-out infinite;
}

@keyframes haloPulse {
  0%, 100% { transform: translate(-50%, -50%) scale(1);   opacity: 0.7; }
  50%      { transform: translate(-50%, -50%) scale(1.08); opacity: 0.95; }
}

.sora-frame {
  position: relative;
  width: 100%;
  max-width: 920px;
  max-height: min(110vh, 1280px);
  display: flex;
  align-items: center;
  justify-content: center;
  z-index: 1;
  animation: floatY 7s ease-in-out infinite;
}

@keyframes floatY {
  0%, 100% { transform: translateY(0); }
  50%      { transform: translateY(-14px); }
}

.sora-image {
  width: 100%;
  max-height: min(110vh, 1280px);
  height: auto;
  object-fit: contain;
  /* 透過背景版でもふんわり世界に馴染む光 */
  filter:
    drop-shadow(0 18px 50px rgba(220, 200, 220, 0.5))
    drop-shadow(0 36px 100px rgba(252, 213, 206, 0.4));
  display: block;
}

.sora-placeholder {
  display: none;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  gap: 16px;
  width: 100%;
  height: 100%;
  padding: 24px;
}

.sora-placeholder svg {
  width: 75%;
  height: auto;
  filter: drop-shadow(0 8px 24px rgba(168, 218, 220, 0.5));
}

.placeholder-note {
  text-align: center;
  font-size: 11px;
  color: var(--whisper);
  background: rgba(255, 255, 255, 0.5);
  padding: 8px 14px;
  border-radius: 12px;
  backdrop-filter: blur(8px);
  -webkit-backdrop-filter: blur(8px);
}

.placeholder-note code {
  font-family: ui-monospace, "SFMono-Regular", monospace;
  font-size: 10px;
  color: var(--soft-ink);
  word-break: break-all;
}

.sora-caption {
  margin-top: 18px;
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 4px;
  z-index: 2;
}

.sora-name {
  font-family: var(--serif-jp);
  font-size: 22px;
  font-weight: 500;
  color: var(--deep-sky);
  letter-spacing: 0.4em;
  padding-left: 0.4em;
}

.sora-role {
  font-family: var(--serif-lat);
  font-style: italic;
  font-size: 13px;
  color: var(--soft-ink);
  letter-spacing: 0.3em;
}

/* スクロール誘導 */
.scroll-hint {
  position: absolute;
  bottom: 30px;
  left: 50%;
  transform: translateX(-50%);
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 12px;
  font-family: var(--serif-lat);
  font-style: italic;
  font-size: 12px;
  color: var(--whisper);
  letter-spacing: 0.3em;
  text-transform: lowercase;
  animation: fadeIn 2s ease 1.4s both;
}

.scroll-line {
  width: 1px;
  height: 50px;
  background: linear-gradient(to bottom, transparent, var(--whisper));
  position: relative;
  overflow: hidden;
}

.scroll-line::after {
  content: '';
  position: absolute;
  top: -50%;
  left: 0;
  width: 100%;
  height: 50%;
  background: linear-gradient(to bottom, transparent, var(--deep-sky));
  animation: scrollDot 2.5s ease-in-out infinite;
}

@keyframes scrollDot {
  0%   { top: -50%; }
  100% { top: 100%; }
}

/* =========================================================
   ─── 共通：セクション・コンテナ ─────────────────────
   ========================================================= */
.container {
  width: 100%;
  max-width: var(--container-max);
  margin: 0 auto;
  padding: 0 max(24px, 4vw);
}

.section-eyebrow {
  font-family: var(--serif-lat);
  font-style: italic;
  font-size: 13px;
  letter-spacing: 0.4em;
  color: var(--soft-ink);
  text-transform: uppercase;
  text-align: center;
  margin-bottom: 16px;
}

.section-title {
  font-family: var(--serif-jp);
  font-weight: 500;
  font-size: clamp(28px, 3.6vw, 44px);
  line-height: 1.5;
  letter-spacing: 0.05em;
  color: var(--deep-sky);
  text-align: center;
  margin-bottom: 24px;
}

.section-lead {
  font-size: clamp(14px, 1.1vw, 16px);
  color: var(--soft-ink);
  text-align: center;
  line-height: 1.95;
  letter-spacing: 0.04em;
  max-width: 720px;
  margin: 0 auto 80px;
}

.mobile-only { display: none; }
@media (max-width: 600px) {
  .mobile-only { display: inline; }
}

/* =========================================================
   ─── セクション2：問題提起 ───────────────────────────
   ========================================================= */
.problem {
  padding: 120px 0 100px;
  position: relative;
}

.problem-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
  gap: 32px;
  max-width: 1100px;
  margin: 0 auto;
}

.problem-card {
  background: rgba(255, 255, 255, 0.45);
  backdrop-filter: blur(16px);
  -webkit-backdrop-filter: blur(16px);
  border: 1px solid rgba(255, 255, 255, 0.7);
  border-radius: 28px;
  padding: 36px 28px;
  text-align: center;
  box-shadow:
    0 8px 32px rgba(180, 200, 220, 0.2),
    inset 0 1px 0 rgba(255, 255, 255, 0.6);
  transition: transform 0.4s ease, box-shadow 0.4s ease;
}

.problem-card:hover {
  transform: translateY(-4px);
  box-shadow:
    0 16px 48px rgba(180, 200, 220, 0.3),
    inset 0 1px 0 rgba(255, 255, 255, 0.7);
}

.problem-icon {
  width: 80px;
  height: 80px;
  margin: 0 auto 20px;
}

.problem-icon svg {
  width: 100%;
  height: 100%;
  filter: drop-shadow(0 4px 12px rgba(180, 200, 220, 0.3));
}

.problem-card h3 {
  font-family: var(--serif-jp);
  font-size: 17px;
  font-weight: 500;
  line-height: 1.6;
  color: var(--deep-sky);
  margin-bottom: 16px;
  letter-spacing: 0.04em;
}

.problem-card p {
  font-size: 14px;
  color: var(--soft-ink);
  line-height: 1.85;
  letter-spacing: 0.03em;
}

.problem-bridge {
  margin-top: 80px;
  text-align: center;
  padding: 40px 32px;
  background: linear-gradient(135deg, rgba(255, 255, 255, 0.5), rgba(252, 213, 206, 0.3));
  backdrop-filter: blur(10px);
  border-radius: 24px;
  max-width: 720px;
  margin-left: auto;
  margin-right: auto;
}

.problem-bridge p {
  font-family: var(--serif-jp);
  font-size: clamp(16px, 1.4vw, 20px);
  line-height: 1.85;
  color: var(--deep-sky);
}

.problem-bridge strong {
  color: var(--gold-deep);
  font-weight: 700;
}

/* =========================================================
   ─── セクション3：3つの違い ─────────────────────────
   ========================================================= */
.differentiators {
  padding: 100px 0;
}

.diff-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
  gap: 28px;
  max-width: 1100px;
  margin: 0 auto;
}

.diff-card {
  position: relative;
  background: linear-gradient(135deg, rgba(255, 255, 255, 0.6), rgba(255, 255, 255, 0.35));
  backdrop-filter: blur(20px);
  -webkit-backdrop-filter: blur(20px);
  border: 1px solid rgba(255, 255, 255, 0.6);
  border-radius: 32px;
  padding: 48px 32px 36px;
  text-align: center;
  box-shadow:
    0 12px 40px rgba(180, 200, 220, 0.2),
    inset 0 1px 0 rgba(255, 255, 255, 0.8);
  overflow: hidden;
  transition: transform 0.4s ease, box-shadow 0.4s ease;
}

.diff-card::before {
  content: '';
  position: absolute;
  top: -50%; left: -50%;
  width: 200%; height: 200%;
  background: radial-gradient(circle at 30% 30%, rgba(244, 211, 94, 0.15), transparent 50%);
  opacity: 0;
  transition: opacity 0.5s ease;
  pointer-events: none;
}

.diff-card:hover { transform: translateY(-6px); }
.diff-card:hover::before { opacity: 1; }

.diff-number {
  position: absolute;
  top: 18px;
  right: 24px;
  font-family: var(--serif-lat);
  font-style: italic;
  font-size: 36px;
  color: var(--whisper);
  opacity: 0.6;
}

.diff-icon {
  width: 96px;
  height: 96px;
  margin: 0 auto 28px;
  filter: drop-shadow(0 6px 20px rgba(180, 200, 220, 0.35));
}

.diff-icon svg {
  width: 100%;
  height: 100%;
}

.diff-card h3 {
  font-family: var(--serif-jp);
  font-size: 22px;
  font-weight: 500;
  color: var(--deep-sky);
  margin-bottom: 20px;
  letter-spacing: 0.06em;
}

.diff-card p {
  font-size: 14px;
  color: var(--soft-ink);
  line-height: 1.95;
  letter-spacing: 0.03em;
}

.diff-card em {
  display: inline-block;
  margin-top: 8px;
  color: var(--gold-deep);
  font-style: normal;
  font-weight: 500;
  font-size: 13px;
}

/* =========================================================
   ─── セクション4：プラン ────────────────────────────
   ========================================================= */
.plans {
  padding: 120px 0;
}

.plans-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
  gap: 28px;
  max-width: 1200px;
  margin: 0 auto;
}

.plan-card {
  position: relative;
  background: rgba(255, 255, 255, 0.55);
  backdrop-filter: blur(18px);
  -webkit-backdrop-filter: blur(18px);
  border: 1px solid rgba(255, 255, 255, 0.65);
  border-radius: 32px;
  padding: 44px 32px 36px;
  text-align: center;
  box-shadow: 0 12px 40px rgba(180, 200, 220, 0.22);
  transition: transform 0.4s ease, box-shadow 0.4s ease;
}

.plan-card:hover {
  transform: translateY(-6px);
  box-shadow: 0 20px 56px rgba(180, 200, 220, 0.32);
}

.plan-card.featured {
  background: linear-gradient(135deg, rgba(255, 250, 240, 0.85), rgba(252, 213, 206, 0.5));
  border: 1.5px solid var(--gold);
  box-shadow:
    0 16px 48px rgba(244, 211, 94, 0.3),
    0 4px 16px rgba(252, 213, 206, 0.4);
  transform: scale(1.04);
}

.plan-card.featured:hover {
  transform: scale(1.04) translateY(-6px);
}

.plan-featured-tag {
  position: absolute;
  top: -14px;
  left: 50%;
  transform: translateX(-50%);
  background: linear-gradient(135deg, var(--gold), var(--peach));
  color: var(--deep-sky);
  padding: 6px 22px;
  border-radius: var(--radius-pill);
  font-size: 12px;
  font-weight: 700;
  letter-spacing: 0.15em;
  box-shadow: 0 4px 12px rgba(244, 211, 94, 0.4);
}

.plan-badge {
  display: inline-block;
  font-family: var(--serif-lat);
  font-style: italic;
  font-size: 12px;
  letter-spacing: 0.3em;
  color: var(--soft-ink);
  text-transform: uppercase;
  margin-bottom: 12px;
}

.plan-name {
  font-family: var(--serif-jp);
  font-size: 24px;
  font-weight: 500;
  color: var(--deep-sky);
  margin-bottom: 6px;
  letter-spacing: 0.06em;
}

.plan-tagline {
  font-size: 13px;
  color: var(--soft-ink);
  margin-bottom: 28px;
  letter-spacing: 0.04em;
}

.plan-features {
  list-style: none;
  text-align: left;
  margin-bottom: 28px;
  padding-top: 24px;
  border-top: 1px dashed rgba(180, 200, 220, 0.4);
}

.plan-features li {
  font-size: 14px;
  color: var(--deep-sky);
  line-height: 1.85;
  padding: 10px 0;
  border-bottom: 1px solid rgba(180, 200, 220, 0.25);
  letter-spacing: 0.02em;
}

.plan-features li:last-child { border-bottom: none; }

.plan-best-for {
  background: rgba(244, 211, 94, 0.12);
  border-radius: 16px;
  padding: 18px 22px;
  text-align: left;
  font-size: 13px;
  line-height: 1.85;
  color: var(--deep-sky);
  letter-spacing: 0.02em;
}

.plan-best-for strong {
  display: block;
  font-family: var(--serif-jp);
  color: var(--gold-deep);
  font-size: 12px;
  letter-spacing: 0.15em;
  margin-bottom: 6px;
  font-weight: 700;
}

.plans-note {
  margin-top: 60px;
  text-align: center;
  color: var(--soft-ink);
  font-size: 14px;
  letter-spacing: 0.04em;
  line-height: 1.95;
}

.plans-pricing-note {
  font-family: var(--serif-jp);
  font-size: clamp(15px, 1.3vw, 18px);
  margin-bottom: 16px;
  color: var(--deep-sky);
}

.plans-pricing-note strong {
  color: var(--gold-deep);
  font-weight: 700;
}

.plans-note small {
  display: block;
  margin-top: 6px;
  color: var(--whisper);
  font-size: 12px;
}

.plans-cta-link {
  display: inline-flex;
  align-items: center;
  gap: 12px;
  margin-top: 28px;
  padding: 16px 36px;
  background: linear-gradient(135deg, #FFFFFF 0%, var(--peach) 60%, var(--gold) 100%);
  color: var(--deep-sky);
  border-radius: var(--radius-pill);
  font-weight: 700;
  font-size: 15px;
  letter-spacing: 0.08em;
  box-shadow: 0 6px 24px rgba(244, 211, 94, 0.35);
  transition: all 0.3s ease;
}

.plans-cta-link:hover {
  transform: translateY(-2px);
  box-shadow: 0 10px 32px rgba(244, 211, 94, 0.5);
}

.cta-arrow-mini {
  font-weight: 300;
  font-size: 18px;
}

/* =========================================================
   ─── セクション5：想定事例（ストーリー型） ───────────
   ========================================================= */
.cases {
  padding: 120px 0;
}

.case-story {
  max-width: 1100px;
  margin: 0 auto 60px;
  background: rgba(255, 255, 255, 0.55);
  backdrop-filter: blur(20px);
  -webkit-backdrop-filter: blur(20px);
  border: 1px solid rgba(255, 255, 255, 0.7);
  border-radius: 36px;
  padding: 48px 56px;
  box-shadow:
    0 16px 56px rgba(180, 200, 220, 0.25),
    inset 0 1px 0 rgba(255, 255, 255, 0.6);
  position: relative;
  overflow: hidden;
}

.case-story::before {
  content: '';
  position: absolute;
  top: 0; right: 0;
  width: 240px; height: 240px;
  background: radial-gradient(circle at 70% 30%, rgba(244, 211, 94, 0.15), transparent 60%);
  pointer-events: none;
}

/* ── ヘッダー：人物プロフィール ── */
.case-story-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 24px;
  flex-wrap: wrap;
  padding-bottom: 32px;
  margin-bottom: 36px;
  border-bottom: 1px solid rgba(180, 200, 220, 0.3);
}

.case-persona {
  display: flex;
  align-items: center;
  gap: 18px;
}

.case-avatar {
  width: 72px;
  height: 72px;
  flex-shrink: 0;
  filter: drop-shadow(0 4px 12px rgba(180, 200, 220, 0.3));
}

.case-avatar svg {
  width: 100%;
  height: 100%;
}

.case-name {
  font-family: var(--serif-jp);
  font-size: 19px;
  font-weight: 500;
  color: var(--deep-sky);
  margin-bottom: 4px;
  letter-spacing: 0.04em;
}

.case-company {
  font-size: 13px;
  color: var(--soft-ink);
  letter-spacing: 0.04em;
  line-height: 1.6;
}

.case-tag {
  display: inline-block;
  padding: 8px 18px;
  background: rgba(244, 211, 94, 0.18);
  color: var(--gold-deep);
  border-radius: var(--radius-pill);
  font-size: 12px;
  font-weight: 700;
  letter-spacing: 0.1em;
}

/* ── Before/After 共通 ── */
.case-pain, .case-gain {
  margin-bottom: 28px;
  padding: 28px 32px;
  border-radius: 24px;
}

.case-pain {
  background: linear-gradient(135deg, rgba(220, 230, 240, 0.45), rgba(200, 215, 230, 0.35));
  border: 1px solid rgba(180, 200, 220, 0.4);
}

.case-gain {
  background: linear-gradient(135deg, rgba(255, 245, 230, 0.55), rgba(252, 213, 206, 0.4));
  border: 1px solid rgba(244, 211, 94, 0.4);
  box-shadow: 0 8px 24px rgba(244, 211, 94, 0.12);
}

.case-pain-header, .case-gain-header {
  margin-bottom: 18px;
}

.case-stage-label {
  display: inline-block;
  padding: 4px 14px;
  font-family: var(--serif-lat);
  font-style: italic;
  font-size: 11px;
  letter-spacing: 0.3em;
  text-transform: uppercase;
  border-radius: var(--radius-pill);
  margin-bottom: 12px;
}

.case-pain .case-stage-label {
  background: rgba(180, 200, 220, 0.5);
  color: var(--soft-ink);
}

.case-gain .case-stage-label {
  background: linear-gradient(135deg, var(--gold), var(--peach));
  color: var(--deep-sky);
}

.case-pain h4, .case-gain h4 {
  font-family: var(--serif-jp);
  font-size: clamp(17px, 1.5vw, 20px);
  font-weight: 500;
  line-height: 1.6;
  color: var(--deep-sky);
  letter-spacing: 0.04em;
}

.case-pain-story, .case-gain-story {
  font-size: 14.5px;
  line-height: 2;
  color: var(--deep-sky);
  letter-spacing: 0.03em;
  margin-bottom: 22px;
}

.case-gain-story {
  color: var(--deep-sky);
}

/* ── 数字グリッド ── */
.case-pain-numbers, .case-gain-numbers {
  list-style: none;
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(160px, 1fr));
  gap: 12px;
  padding-top: 16px;
  border-top: 1px dashed rgba(180, 200, 220, 0.4);
}

.case-pain-numbers li, .case-gain-numbers li {
  display: flex;
  flex-direction: column;
  gap: 4px;
}

.num-label {
  font-size: 11px;
  letter-spacing: 0.2em;
  color: var(--soft-ink);
  text-transform: uppercase;
  font-family: var(--serif-lat);
  font-style: italic;
}

.num-value {
  font-family: var(--serif-jp);
  font-size: 20px;
  font-weight: 700;
  color: var(--deep-sky);
  letter-spacing: 0.02em;
}

.case-gain .num-value {
  color: var(--gold-deep);
}

.num-value em {
  display: inline-block;
  margin-left: 4px;
  font-size: 13px;
  font-style: normal;
  font-weight: 500;
  color: var(--gold-deep);
  letter-spacing: 0.04em;
}

.case-pain .num-value em {
  color: var(--soft-ink);
}

/* ── 本人の声 ── */
.case-voice {
  margin-top: 32px;
  padding: 28px 36px;
  background: linear-gradient(135deg, rgba(255, 255, 255, 0.7), rgba(255, 245, 230, 0.5));
  border-left: 3px solid var(--gold);
  border-radius: 16px;
  position: relative;
}

.case-voice::before {
  content: '"';
  position: absolute;
  top: 12px;
  left: 16px;
  font-family: var(--serif-lat);
  font-size: 56px;
  color: var(--gold);
  opacity: 0.35;
  line-height: 1;
}

.case-voice p {
  font-family: var(--serif-jp);
  font-size: 15px;
  line-height: 2.1;
  color: var(--deep-sky);
  letter-spacing: 0.04em;
  padding-left: 20px;
}

.case-voice strong {
  background: linear-gradient(transparent 60%, rgba(244, 211, 94, 0.4) 60%);
  font-weight: 700;
}

.case-voice cite {
  display: block;
  margin-top: 16px;
  text-align: right;
  font-family: var(--serif-lat);
  font-style: italic;
  font-size: 13px;
  color: var(--gold-deep);
  letter-spacing: 0.15em;
}

.cases-footer {
  text-align: center;
  margin-top: 40px;
  font-size: 13px;
  color: var(--soft-ink);
  line-height: 1.95;
  letter-spacing: 0.04em;
}

/* =========================================================
   ─── セクション6：最終CTA ──────────────────────────
   ========================================================= */
.final-cta {
  padding: 140px 0 120px;
  position: relative;
}

.final-cta-inner {
  max-width: 880px;
  margin: 0 auto;
  text-align: center;
  background: linear-gradient(135deg, rgba(255, 255, 255, 0.7), rgba(255, 245, 235, 0.55));
  backdrop-filter: blur(24px);
  -webkit-backdrop-filter: blur(24px);
  border: 1.5px solid rgba(255, 255, 255, 0.8);
  border-radius: 48px;
  padding: 80px 60px;
  box-shadow:
    0 24px 80px rgba(180, 200, 220, 0.3),
    0 8px 32px rgba(252, 213, 206, 0.4);
}

.final-cta-eyebrow {
  font-family: var(--serif-lat);
  font-style: italic;
  font-size: 13px;
  letter-spacing: 0.4em;
  color: var(--soft-ink);
  text-transform: uppercase;
  margin-bottom: 20px;
}

.final-cta-title {
  font-family: var(--serif-jp);
  font-weight: 500;
  font-size: clamp(30px, 4vw, 52px);
  line-height: 1.4;
  letter-spacing: 0.05em;
  color: var(--deep-sky);
  margin-bottom: 24px;
}

.final-cta-sub {
  font-size: clamp(14px, 1.1vw, 16px);
  color: var(--soft-ink);
  line-height: 1.95;
  margin-bottom: 48px;
}

.sora-message {
  background: rgba(255, 255, 255, 0.55);
  border-left: 3px solid var(--gold);
  border-radius: 16px;
  padding: 28px 36px;
  text-align: left;
  margin: 0 auto 48px;
  max-width: 640px;
  font-family: var(--serif-jp);
}

.sora-message p {
  font-size: 15px;
  line-height: 2.1;
  color: var(--deep-sky);
  letter-spacing: 0.04em;
}

.sora-message cite {
  display: block;
  margin-top: 16px;
  font-family: var(--serif-lat);
  font-style: italic;
  font-size: 13px;
  letter-spacing: 0.2em;
  color: var(--gold-deep);
  text-align: right;
}

.final-cta-button-wrapper {
  margin-bottom: 32px;
}

.cta-large {
  padding: 24px 56px;
  font-size: 18px;
}

.cta-large .cta-label { font-size: 19px; }

.final-trust {
  list-style: none;
  display: flex;
  flex-wrap: wrap;
  justify-content: center;
  gap: 24px;
  font-size: 12px;
  color: var(--whisper);
  letter-spacing: 0.08em;
}

/* =========================================================
   ─── フッター ────────────────────────────────────────
   ========================================================= */
.site-footer {
  padding: 60px 0 30px;
  background: rgba(255, 255, 255, 0.4);
  backdrop-filter: blur(12px);
  border-top: 1px solid rgba(255, 255, 255, 0.5);
}

.footer-grid {
  display: grid;
  grid-template-columns: 1fr 2fr;
  gap: 40px;
  align-items: center;
  margin-bottom: 40px;
}

.footer-brand {
  display: flex;
  flex-direction: column;
}

.footer-by {
  margin-top: 8px;
  font-family: var(--serif-lat);
  font-style: italic;
  font-size: 12px;
  color: var(--whisper);
  letter-spacing: 0.15em;
}

.footer-nav {
  display: flex;
  flex-wrap: wrap;
  gap: 28px;
  justify-content: flex-end;
}

.footer-nav a {
  font-size: 13px;
  color: var(--soft-ink);
  letter-spacing: 0.08em;
}

.footer-nav a:hover { color: var(--deep-sky); }

.footer-bottom {
  text-align: center;
  padding-top: 24px;
  border-top: 1px solid rgba(180, 200, 220, 0.25);
  color: var(--whisper);
  font-size: 11px;
  letter-spacing: 0.1em;
}

/* =========================================================
   ─── アニメーション ─────────────────────────────────
   ========================================================= */
@keyframes fadeIn {
  from { opacity: 0; }
  to   { opacity: 1; }
}

@keyframes fadeInUp {
  from { opacity: 0; transform: translateY(30px); }
  to   { opacity: 1; transform: translateY(0); }
}

/* =========================================================
   ─── レスポンシブ ─────────────────────────────────────
   ========================================================= */

@media (max-width: 900px) {
  .site-nav {
    gap: 16px;
  }
  .site-nav a:not(.nav-cta) {
    display: none;
  }

  .hero-grid {
    grid-template-columns: 1fr;
    gap: 30px;
  }

  .sora-stage {
    order: -1;
  }

  .sora-frame {
    width: min(80%, 360px);
  }
}

@media (max-width: 600px) {
  :root { --header-h: 64px; }

  .hero {
    padding: calc(var(--header-h) + 30px) 20px 60px;
  }

  .hero-grid { gap: 20px; }

  .hero-cta-group {
    flex-direction: column;
    align-items: stretch;
  }

  .cta-primary {
    width: 100%;
    text-align: center;
    align-items: center;
  }

  .hero-trust {
    gap: 12px;
    font-size: 11px;
  }

  .scroll-hint { display: none; }

  .hero-headline {
    white-space: normal;
  }

  .problem, .differentiators, .plans, .cases, .final-cta {
    padding: 70px 0;
  }

  .section-lead { margin-bottom: 50px; }

  .plan-card.featured {
    transform: scale(1);
  }
  .plan-card.featured:hover {
    transform: translateY(-6px);
  }

  .case-story {
    padding: 32px 24px;
    border-radius: 24px;
  }

  .case-story-header {
    flex-direction: column;
    align-items: flex-start;
    gap: 16px;
  }

  .case-pain, .case-gain {
    padding: 22px 20px;
    border-radius: 18px;
  }

  .case-voice {
    padding: 22px 24px;
  }

  .case-voice p { padding-left: 12px; font-size: 14px; }

  .final-cta-inner {
    padding: 50px 28px;
    border-radius: 32px;
  }

  .sora-message {
    padding: 24px 22px;
  }

  .footer-grid {
    grid-template-columns: 1fr;
    gap: 24px;
    text-align: center;
  }

  .footer-nav {
    justify-content: center;
  }
}

/* prefers-reduced-motion 対応 */
@media (prefers-reduced-motion: reduce) {
  *, *::before, *::after {
    animation-duration: 0.01ms !important;
    animation-iteration-count: 1 !important;
    transition-duration: 0.01ms !important;
  }
}