/* ========================================
   PARALLAX Landing Page — Design System v2
   ========================================
   参考: Accenture（空間設計）、Stripe（タイポグラフィ）、
         Palantir（ダークUI・インテリジェンス感）
   原則: AIテンプレ感の排除。安価なアイコン禁止。
         テキストと余白と線で格を示す。
   ======================================== */

/* --- CSS Custom Properties --- */
:root {
  --navy-950: #04080f;
  --navy-900: #0a1220;
  --navy-800: #101c30;
  --navy-700: #182840;
  --navy-600: #1e3450;

  --gold-600: #a38834;
  --gold-500: #c9a84c;
  --gold-400: #d4b96a;
  --gold-300: #e0ca88;
  --gold-glow: rgba(201, 168, 76, 0.08);

  --white: #ffffff;
  --gray-50: #f5f5f7;
  --gray-100: #e8e8ec;
  --gray-200: #c8c9cf;
  --gray-300: #9ea0a8;
  --gray-400: #72747e;
  --gray-500: #55575f;
  --gray-600: #3a3c44;

  --text-primary: var(--white);
  --text-secondary: var(--gray-300);
  --text-muted: var(--gray-400);
  --accent: var(--gold-500);
  --accent-hover: var(--gold-400);
  --bg-primary: var(--navy-900);
  --bg-secondary: var(--navy-800);
  --bg-deep: var(--navy-950);
  --border: rgba(255, 255, 255, 0.06);
  --border-strong: rgba(255, 255, 255, 0.12);

  --font-heading: 'Noto Serif JP', 'Georgia', serif;
  --font-body: 'Inter', 'Noto Sans JP', 'Helvetica Neue', sans-serif;

  --section-padding: clamp(100px, 12vw, 180px);
  --container-max: 1140px;
  --container-narrow: 720px;

  --ease-out-expo: cubic-bezier(0.16, 1, 0.3, 1);
  --ease-out-quart: cubic-bezier(0.25, 1, 0.5, 1);
}

/* --- リセット --- */
*, *::before, *::after {
  margin: 0;
  padding: 0;
  box-sizing: border-box;
}

html {
  scroll-behavior: smooth;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}

body {
  font-family: var(--font-body);
  background-color: var(--bg-primary);
  color: var(--text-primary);
  line-height: 1.7;
  font-size: 16px;
  overflow-x: hidden;
}

a {
  color: var(--accent);
  text-decoration: none;
  transition: color 0.3s ease;
}

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

.text-accent { color: var(--accent); }

.hide-mobile { display: inline; }

/* --- コンテナ --- */
.container {
  max-width: var(--container-max);
  margin: 0 auto;
  padding: 0 clamp(24px, 5vw, 60px);
}

.container--narrow {
  max-width: var(--container-narrow);
}

/* --- セクション共通 --- */
section {
  padding: var(--section-padding) 0;
  position: relative;
}

.section-label {
  font-family: var(--font-body);
  font-size: 0.7rem;
  font-weight: 500;
  letter-spacing: 0.25em;
  text-transform: uppercase;
  color: var(--accent);
  margin-bottom: 2rem;
  display: block;
}

.section-title {
  font-family: var(--font-heading);
  font-size: clamp(1.7rem, 3.5vw, 2.6rem);
  font-weight: 600;
  line-height: 1.4;
  margin-bottom: 1.5rem;
  color: var(--text-primary);
  letter-spacing: -0.01em;
}

.section-subtitle {
  font-size: clamp(0.95rem, 1.8vw, 1.1rem);
  color: var(--text-secondary);
  line-height: 1.8;
  font-weight: 300;
}

/* --- ヘッダー --- */
.header {
  position: fixed;
  top: 0;
  left: 0;
  width: 100%;
  z-index: 1000;
  padding: 1.5rem 0;
  transition: all 0.5s var(--ease-out-quart);
  background: transparent;
}

.header--scrolled {
  background: rgba(10, 18, 32, 0.85);
  backdrop-filter: blur(24px);
  -webkit-backdrop-filter: blur(24px);
  border-bottom: 1px solid var(--border);
  padding: 1rem 0;
}

.header .container {
  display: flex;
  align-items: center;
  justify-content: space-between;
}

.logo {
  font-family: var(--font-body);
  font-size: 1.1rem;
  font-weight: 700;
  letter-spacing: 0.2em;
  color: var(--text-primary);
}

.logo-accent { color: var(--accent); }

.nav-links {
  display: flex;
  gap: 2.5rem;
  list-style: none;
  align-items: center;
}

.nav-links a {
  font-size: 0.8rem;
  font-weight: 400;
  color: var(--text-muted);
  letter-spacing: 0.08em;
  transition: color 0.3s ease;
}

.nav-links a:hover { color: var(--text-primary); }

/* --- ボタン --- */
.btn {
  display: inline-flex;
  align-items: center;
  gap: 0.6rem;
  padding: 0.875rem 2rem;
  font-family: var(--font-body);
  font-size: 0.85rem;
  font-weight: 500;
  letter-spacing: 0.04em;
  border: none;
  border-radius: 2px;
  cursor: pointer;
  transition: all 0.4s var(--ease-out-quart);
  text-decoration: none;
}

.btn--primary {
  background: var(--accent);
  color: var(--navy-950);
}

.btn--primary:hover {
  background: var(--accent-hover);
  color: var(--navy-950);
  transform: translateY(-1px);
  box-shadow: 0 12px 40px rgba(201, 168, 76, 0.2);
}

.btn--outline {
  background: transparent;
  color: var(--text-secondary);
  border: 1px solid var(--border-strong);
}

.btn--outline:hover {
  color: var(--text-primary);
  border-color: var(--gray-400);
  transform: translateY(-1px);
}

.btn--nav {
  padding: 0.5rem 1.2rem;
  font-size: 0.75rem;
}

.btn--large {
  padding: 1rem 2.5rem;
  font-size: 0.9rem;
}

.btn--full { width: 100%; justify-content: center; }

.btn-arrow {
  transition: transform 0.3s ease;
  font-weight: 300;
}

.btn:hover .btn-arrow { transform: translateX(4px); }

/* ===========================
   HERO
   =========================== */
.hero {
  min-height: 100vh;
  display: flex;
  align-items: center;
  justify-content: center;
  position: relative;
  overflow: hidden;
  padding-top: 80px;
}

.hero-bg {
  position: absolute;
  inset: 0;
  z-index: 0;
}

.hero-grid {
  position: absolute;
  inset: 0;
  background-image:
    linear-gradient(rgba(201, 168, 76, 0.015) 1px, transparent 1px),
    linear-gradient(90deg, rgba(201, 168, 76, 0.015) 1px, transparent 1px);
  background-size: 80px 80px;
  mask-image: radial-gradient(ellipse 70% 60% at 50% 50%, black, transparent);
  -webkit-mask-image: radial-gradient(ellipse 70% 60% at 50% 50%, black, transparent);
}

.hero-glow {
  position: absolute;
  width: 800px;
  height: 800px;
  border-radius: 50%;
  background: radial-gradient(circle, rgba(201, 168, 76, 0.04), transparent 70%);
  top: 30%;
  left: 50%;
  transform: translate(-50%, -50%);
  animation: glowFloat 20s ease-in-out infinite;
}

.hero-glow--secondary {
  width: 600px;
  height: 600px;
  background: radial-gradient(circle, rgba(30, 52, 80, 0.3), transparent 70%);
  top: 60%;
  left: 30%;
  animation-delay: -8s;
  animation-duration: 25s;
}

@keyframes glowFloat {
  0%, 100% { transform: translate(-50%, -50%) scale(1); }
  50% { transform: translate(-50%, -50%) scale(1.15); }
}

.hero-content {
  position: relative;
  z-index: 1;
  text-align: center;
  max-width: 820px;
  padding: 0 clamp(24px, 5vw, 60px);
}

.hero-eyebrow {
  font-family: var(--font-body);
  font-size: 0.7rem;
  font-weight: 400;
  letter-spacing: 0.35em;
  text-transform: uppercase;
  color: var(--gold-400);
  margin-bottom: 2.5rem;
  opacity: 0;
  animation: fadeUp 1s var(--ease-out-expo) 0.3s forwards;
}

.hero-title {
  font-family: var(--font-heading);
  font-size: clamp(2rem, 5vw, 3.6rem);
  font-weight: 600;
  line-height: 1.25;
  margin-bottom: 2rem;
  letter-spacing: -0.02em;
  opacity: 0;
  animation: fadeUp 1s var(--ease-out-expo) 0.5s forwards;
}

.hero-title-accent { color: var(--accent); }

.hero-subtitle {
  font-size: clamp(0.95rem, 2vw, 1.15rem);
  font-weight: 300;
  color: var(--text-secondary);
  line-height: 1.9;
  margin-bottom: 3.5rem;
  opacity: 0;
  animation: fadeUp 1s var(--ease-out-expo) 0.7s forwards;
}

.hero-cta {
  margin-bottom: 2rem;
  opacity: 0;
  animation: fadeUp 1s var(--ease-out-expo) 0.9s forwards;
}

.hero-badge {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 0.5rem;
  font-size: 0.75rem;
  font-weight: 400;
  color: var(--text-muted);
  letter-spacing: 0.05em;
  opacity: 0;
  animation: fadeUp 1s var(--ease-out-expo) 1.1s forwards;
}

.hero-badge-dot {
  width: 5px;
  height: 5px;
  border-radius: 50%;
  background: #4ade80;
  animation: pulse 2.5s ease infinite;
}

@keyframes pulse {
  0%, 100% { opacity: 1; }
  50% { opacity: 0.3; }
}

.hero-scroll-indicator {
  position: absolute;
  bottom: 40px;
  left: 50%;
  transform: translateX(-50%);
  opacity: 0;
  animation: fadeIn 1s ease 2s forwards;
}

.hero-scroll-line {
  width: 1px;
  height: 48px;
  background: linear-gradient(to bottom, var(--accent), transparent);
  animation: scrollLine 2s ease-in-out infinite;
}

@keyframes scrollLine {
  0% { transform: scaleY(0); transform-origin: top; }
  50% { transform: scaleY(1); transform-origin: top; }
  51% { transform: scaleY(1); transform-origin: bottom; }
  100% { transform: scaleY(0); transform-origin: bottom; }
}

/* ===========================
   PROBLEM
   =========================== */
.problem {
  background: var(--bg-deep);
  border-top: 1px solid var(--border);
}

.problem-layout {
  display: grid;
  grid-template-columns: 1fr 1.2fr;
  gap: clamp(40px, 8vw, 100px);
  align-items: start;
}

.problem-left {
  position: sticky;
  top: 120px;
}

.problem-right {
  padding-top: 0.5rem;
}

.problem-item {
  padding: 2rem 0;
  border-bottom: 1px solid var(--border);
  display: flex;
  gap: 2rem;
  align-items: baseline;
  opacity: 0;
  transform: translateY(20px);
  transition: all 0.7s var(--ease-out-expo);
}

.problem-item.visible {
  opacity: 1;
  transform: translateY(0);
}

.problem-number {
  font-family: var(--font-body);
  font-size: 0.65rem;
  font-weight: 500;
  color: var(--accent);
  letter-spacing: 0.1em;
  flex-shrink: 0;
}

.problem-text {
  font-family: var(--font-heading);
  font-size: clamp(1.1rem, 2.5vw, 1.5rem);
  font-weight: 400;
  line-height: 1.6;
  color: var(--gray-400);
}

.problem-text strong {
  color: var(--text-primary);
  font-weight: 600;
}

.problem-question {
  margin-top: 3rem;
  font-family: var(--font-heading);
  font-size: clamp(1.3rem, 3vw, 1.8rem);
  font-weight: 600;
  color: var(--accent);
  opacity: 0;
  transform: translateY(20px);
  transition: all 0.8s var(--ease-out-expo);
}

.problem-question.visible {
  opacity: 1;
  transform: translateY(0);
}

/* ===========================
   VALUE
   =========================== */
.value {
  background: var(--bg-primary);
  text-align: center;
  border-bottom: 1px solid var(--border);
}

.value-body {
  font-family: var(--font-heading);
  font-size: clamp(1rem, 2vw, 1.2rem);
  font-weight: 300;
  line-height: 2;
  color: var(--text-secondary);
  margin-bottom: 1.5rem;
}

.value-body strong {
  color: var(--text-primary);
  font-weight: 500;
}

/* ===========================
   CAPABILITIES
   =========================== */
.capabilities {
  background: var(--bg-deep);
  border-bottom: 1px solid var(--border);
}

.capability-row {
  display: grid;
  grid-template-columns: 80px 1fr;
  gap: 2rem;
  padding: 3.5rem 0;
  border-bottom: 1px solid var(--border);
  align-items: start;
  opacity: 0;
  transform: translateY(20px);
  transition: all 0.7s var(--ease-out-expo);
}

.capability-row.visible {
  opacity: 1;
  transform: translateY(0);
}

.capability-row:last-child { border-bottom: none; }

.capability-index {
  font-family: var(--font-body);
  font-size: 0.65rem;
  font-weight: 500;
  color: var(--accent);
  letter-spacing: 0.1em;
  padding-top: 0.4rem;
}

.capability-title {
  font-family: var(--font-heading);
  font-size: clamp(1.3rem, 2.5vw, 1.8rem);
  font-weight: 600;
  margin-bottom: 0.25rem;
  color: var(--text-primary);
}

.capability-subtitle {
  font-size: 0.7rem;
  font-weight: 400;
  letter-spacing: 0.15em;
  text-transform: uppercase;
  color: var(--text-muted);
  margin-bottom: 1rem;
}

.capability-desc {
  font-size: 0.95rem;
  font-weight: 300;
  color: var(--text-secondary);
  line-height: 1.8;
  max-width: 600px;
}

/* ===========================
   METHODOLOGY
   =========================== */
.methodology {
  background: var(--bg-primary);
}

.methodology-header {
  margin-bottom: 4rem;
}

.methodology-intro {
  font-size: clamp(0.95rem, 1.8vw, 1.05rem);
  font-weight: 300;
  color: var(--text-secondary);
  line-height: 1.9;
  max-width: 680px;
}

.cycle-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 1px;
  background: var(--border);
  border: 1px solid var(--border);
}

.cycle-item {
  background: var(--bg-primary);
  padding: 2.5rem 2rem;
  opacity: 0;
  transform: translateY(20px);
  transition: all 0.6s var(--ease-out-expo);
}

.cycle-item.visible {
  opacity: 1;
  transform: translateY(0);
}

.cycle-item:hover {
  background: var(--bg-secondary);
}

.cycle-number {
  font-family: var(--font-body);
  font-size: 0.65rem;
  font-weight: 500;
  color: var(--accent);
  letter-spacing: 0.1em;
  margin-bottom: 1.5rem;
}

.cycle-name {
  font-family: var(--font-body);
  font-size: 1rem;
  font-weight: 600;
  color: var(--text-primary);
  margin-bottom: 0.75rem;
  letter-spacing: 0.02em;
}

.cycle-desc {
  font-size: 0.85rem;
  font-weight: 300;
  color: var(--text-secondary);
  line-height: 1.7;
}

/* ===========================
   PRICING
   =========================== */
.pricing {
  background: var(--bg-deep);
  border-top: 1px solid var(--border);
}

.pricing-header {
  text-align: center;
  margin-bottom: 4rem;
}

.pricing-header .section-subtitle {
  margin-top: 0.5rem;
}

.pricing-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 1px;
  background: var(--border);
  border: 1px solid var(--border);
}

.pricing-card {
  background: var(--bg-deep);
  padding: 3rem 2.5rem;
  display: flex;
  flex-direction: column;
  opacity: 0;
  transform: translateY(20px);
  transition: all 0.5s var(--ease-out-quart);
  position: relative;
}

.pricing-card.visible {
  opacity: 1;
  transform: translateY(0);
}

.pricing-card--featured {
  background: var(--navy-800);
}

.pricing-badge {
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  background: var(--accent);
  color: var(--navy-950);
  font-size: 0.65rem;
  font-weight: 600;
  letter-spacing: 0.15em;
  padding: 0.4rem;
  text-align: center;
  text-transform: uppercase;
}

.pricing-card--featured {
  padding-top: calc(3rem + 28px);
}

.pricing-name {
  font-size: 0.75rem;
  font-weight: 500;
  letter-spacing: 0.15em;
  text-transform: uppercase;
  color: var(--text-muted);
  margin-bottom: 0.75rem;
}

.pricing-price {
  font-family: var(--font-heading);
  font-size: 1.8rem;
  font-weight: 600;
  color: var(--text-primary);
  margin-bottom: 0.25rem;
}

.pricing-price-suffix {
  font-size: 0.85rem;
  font-weight: 300;
  color: var(--text-muted);
}

.pricing-desc {
  font-size: 0.85rem;
  font-weight: 300;
  color: var(--text-secondary);
  margin-bottom: 2rem;
  padding-bottom: 2rem;
  border-bottom: 1px solid var(--border);
}

.pricing-features {
  list-style: none;
  flex-grow: 1;
  margin-bottom: 2rem;
}

.pricing-features li {
  font-size: 0.85rem;
  font-weight: 300;
  color: var(--text-secondary);
  padding: 0.5rem 0;
  padding-left: 1.5rem;
  position: relative;
}

.pricing-features li::before {
  content: '—';
  position: absolute;
  left: 0;
  color: var(--accent);
  font-weight: 400;
}

/* ===========================
   CTA
   =========================== */
.cta-section {
  background: var(--bg-primary);
  border-top: 1px solid var(--border);
  text-align: center;
  padding: clamp(100px, 12vw, 160px) 0;
}

.cta-title {
  font-family: var(--font-heading);
  font-size: clamp(1.6rem, 3.5vw, 2.6rem);
  font-weight: 600;
  margin-bottom: 1.5rem;
  letter-spacing: -0.01em;
}

.cta-subtitle {
  font-size: 1rem;
  font-weight: 300;
  color: var(--text-secondary);
  margin-bottom: 3rem;
}

.cta-form {
  display: flex;
  gap: 0;
  max-width: 460px;
  margin: 0 auto 1.5rem;
}

.cta-input {
  flex: 1;
  padding: 0.9rem 1.25rem;
  font-family: var(--font-body);
  font-size: 0.85rem;
  font-weight: 300;
  background: var(--navy-800);
  border: 1px solid var(--border-strong);
  border-right: none;
  border-radius: 2px 0 0 2px;
  color: var(--text-primary);
  outline: none;
  transition: border-color 0.3s ease;
}

.cta-input::placeholder { color: var(--gray-500); }
.cta-input:focus { border-color: var(--accent); }

.cta-form .btn {
  border-radius: 0 2px 2px 0;
  white-space: nowrap;
}

.cta-note {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 0.5rem;
  font-size: 0.75rem;
  font-weight: 300;
  color: var(--text-muted);
  letter-spacing: 0.03em;
}

/* --- フォーム送信状態 --- */
.btn--loading {
  opacity: 0.7;
  cursor: not-allowed;
}

.btn--success {
  background: #4ade80 !important;
  color: var(--navy-950) !important;
  cursor: default;
}

.btn-spinner {
  display: inline-block;
  width: 14px;
  height: 14px;
  border: 2px solid rgba(4, 8, 15, 0.3);
  border-top-color: var(--navy-950);
  border-radius: 50%;
  animation: spin 0.6s linear infinite;
  margin-right: 0.4rem;
  vertical-align: middle;
}

@keyframes spin {
  to { transform: rotate(360deg); }
}

.form-status {
  font-size: 0.8rem;
  font-weight: 300;
  text-align: center;
  margin-bottom: 0.75rem;
  min-height: 1.2em;
  transition: all 0.3s ease;
}

.form-status--success {
  color: #4ade80;
}

.form-status--error {
  color: #f87171;
}

/* --- Footer --- */
.footer {
  background: var(--bg-deep);
  border-top: 1px solid var(--border);
}

.footer-top {
  padding: 3rem 0 2rem;
}

.footer-tagline {
  font-size: 0.7rem;
  font-weight: 300;
  color: var(--text-muted);
  letter-spacing: 0.1em;
  text-transform: uppercase;
  margin-top: 0.5rem;
}

.footer-bottom {
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding: 2rem 0;
  border-top: 1px solid var(--border);
}

.footer-copy {
  font-size: 0.75rem;
  font-weight: 300;
  color: var(--text-muted);
}

.footer-links {
  display: flex;
  gap: 2rem;
  list-style: none;
}

.footer-links a {
  font-size: 0.75rem;
  font-weight: 300;
  color: var(--text-muted);
}

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

/* ===========================
   アニメーション
   =========================== */
@keyframes fadeUp {
  from { opacity: 0; transform: translateY(24px); }
  to { opacity: 1; transform: translateY(0); }
}

@keyframes fadeIn {
  from { opacity: 0; }
  to { opacity: 1; }
}

/* ===========================
   レスポンシブ
   =========================== */
@media (max-width: 768px) {
  .nav-links { display: none; }

  .hide-mobile { display: none; }

  .problem-layout {
    grid-template-columns: 1fr;
    gap: 2rem;
  }

  .problem-left {
    position: static;
  }

  .capability-row {
    grid-template-columns: 1fr;
    gap: 0.5rem;
  }

  .capability-index {
    padding-top: 0;
  }

  .cycle-grid {
    grid-template-columns: 1fr;
  }

  .pricing-grid {
    grid-template-columns: 1fr;
    max-width: 400px;
    margin-left: auto;
    margin-right: auto;
  }

  .cta-form {
    flex-direction: column;
  }

  .cta-input {
    border-right: 1px solid var(--border-strong);
    border-radius: 2px;
  }

  .cta-form .btn { border-radius: 2px; }

  .footer-bottom {
    flex-direction: column;
    text-align: center;
    gap: 1rem;
  }
}