:root {
  --bg: #ffffff;
  --bg-surface: #f4f5f8;
  --bg-card: #ffffff;
  --fg: #1a1a2e;
  --fg-muted: #6b7280;
  --accent: #2563eb;
  --accent-hover: #1d4ed8;
  --accent-warm: #f59e0b;
  --accent-light: rgba(37, 99, 235, 0.08);
  --warm-light: rgba(245, 158, 11, 0.08);
  --border: #e5e7eb;
  --border-strong: #d1d5db;
  --radius: 12px;
  --font-display: 'Space Grotesk', system-ui, sans-serif;
  --font-body: 'DM Sans', system-ui, sans-serif;
  --shadow-sm: 0 1px 3px rgba(0,0,0,0.06), 0 1px 2px rgba(0,0,0,0.04);
  --shadow-md: 0 4px 12px rgba(0,0,0,0.08), 0 2px 4px rgba(0,0,0,0.04);
  --shadow-accent: 0 0 0 3px rgba(37, 99, 235, 0.15);
}

* { margin: 0; padding: 0; box-sizing: border-box; }

html { scroll-behavior: smooth; }

body {
  background: var(--bg);
  color: var(--fg);
  font-family: var(--font-body);
  font-size: 17px;
  line-height: 1.65;
  -webkit-font-smoothing: antialiased;
  overflow-x: hidden;
}

a { color: inherit; text-decoration: none; }

/* ==================== NAV ==================== */
.site-nav {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 0 24px;
  height: 60px;
  background: var(--bg);
  border-bottom: 1px solid var(--border);
  position: sticky;
  top: 0;
  z-index: 100;
}

.nav-brand {
  font-family: var(--font-display);
  font-size: 18px;
  font-weight: 700;
  color: var(--fg);
  display: flex;
  align-items: center;
  gap: 8px;
}

.nav-brand-dot {
  width: 8px;
  height: 8px;
  background: var(--accent);
  border-radius: 50%;
}

.nav-links {
  display: flex;
  align-items: center;
  gap: 24px;
  list-style: none;
}

.nav-links a {
  font-size: 14px;
  font-weight: 500;
  color: var(--fg-muted);
  transition: color 0.2s;
}

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

.nav-cta {
  font-family: var(--font-display);
  font-size: 13px;
  font-weight: 600;
  background: var(--accent);
  color: #fff !important;
  padding: 8px 18px;
  border-radius: 8px;
  transition: background 0.2s, transform 0.15s;
}

.nav-cta:hover {
  background: var(--accent-hover);
  color: #fff !important;
  transform: translateY(-1px);
}

.nav-i18n-btn {
  background: none;
  border: 1px solid var(--border);
  border-radius: 8px;
  padding: 7px 12px;
  cursor: pointer;
  font-size: 14px;
  color: var(--fg-muted);
  display: flex;
  align-items: center;
  gap: 6px;
  transition: all 0.2s;
}

.nav-i18n-btn:hover {
  border-color: var(--accent);
  color: var(--accent);
  background: var(--accent-light);
}

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

.section-label {
  font-family: var(--font-display);
  font-size: 13px;
  font-weight: 600;
  letter-spacing: 2.5px;
  text-transform: uppercase;
  color: var(--accent);
  margin-bottom: 20px;
}

/* ==================== HERO ==================== */
.hero {
  position: relative;
  padding: 100px 24px 80px;
  min-height: 90vh;
  display: flex;
  align-items: center;
  justify-content: center;
  overflow: hidden;
  background: var(--bg);
}

.hero::before {
  content: '';
  position: absolute;
  top: -100px;
  right: -80px;
  width: 600px;
  height: 600px;
  background: radial-gradient(circle, rgba(37,99,235,0.06) 0%, transparent 70%);
  pointer-events: none;
}

.hero-grid {
  max-width: 1140px;
  width: 100%;
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 60px;
  align-items: center;
  position: relative;
  z-index: 2;
}

.hero-label {
  font-family: var(--font-display);
  font-size: 13px;
  font-weight: 600;
  letter-spacing: 2.5px;
  text-transform: uppercase;
  color: var(--accent);
  margin-bottom: 24px;
}

.hero h1 {
  font-family: var(--font-display);
  font-size: clamp(36px, 5vw, 56px);
  font-weight: 700;
  line-height: 1.12;
  letter-spacing: -1.5px;
  margin-bottom: 28px;
  color: var(--fg);
}

.hero-lede {
  font-size: 18px;
  color: var(--fg-muted);
  max-width: 480px;
  line-height: 1.7;
  margin-bottom: 36px;
}

.hero-cta {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  font-family: var(--font-display);
  font-size: 15px;
  font-weight: 700;
  background: var(--accent);
  color: #fff;
  padding: 14px 28px;
  border-radius: 10px;
  transition: all 0.2s;
  box-shadow: var(--shadow-md);
}

.hero-cta:hover {
  background: var(--accent-hover);
  transform: translateY(-2px);
  box-shadow: 0 6px 20px rgba(37,99,235,0.25);
}

/* Radar Card */
.radar-card {
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: 16px;
  padding: 32px;
  position: relative;
  overflow: hidden;
  box-shadow: var(--shadow-md);
}

.radar-card::before {
  content: '';
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  height: 3px;
  background: linear-gradient(90deg, transparent, var(--accent), transparent);
}

.radar-header {
  font-family: var(--font-display);
  font-size: 14px;
  font-weight: 600;
  color: var(--fg-muted);
  text-transform: uppercase;
  letter-spacing: 1.5px;
  margin-bottom: 28px;
}

.channel-row {
  display: flex;
  align-items: center;
  gap: 12px;
  margin-bottom: 14px;
}

.ch-name {
  font-family: var(--font-display);
  font-size: 14px;
  font-weight: 500;
  color: var(--fg-muted);
  width: 100px;
  flex-shrink: 0;
}

.ch-bar {
  flex: 1;
  height: 6px;
  background: var(--bg-surface);
  border-radius: 3px;
  overflow: hidden;
}

.ch-fill {
  height: 100%;
  background: linear-gradient(90deg, var(--accent), #60a5fa);
  border-radius: 3px;
  transition: width 1s ease;
}

.ch-score {
  font-family: var(--font-display);
  font-size: 15px;
  font-weight: 700;
  width: 32px;
  text-align: right;
  flex-shrink: 0;
}

.ch-score.high { color: var(--accent); }
.ch-score.mid { color: var(--accent-warm); }
.ch-score.low { color: #dc2626; }

.radar-footer {
  margin-top: 24px;
  padding-top: 16px;
  border-top: 1px solid var(--border);
  font-size: 13px;
  color: var(--fg-muted);
  font-family: var(--font-display);
  letter-spacing: 0.5px;
}

/* ==================== PROBLEM ==================== */
.problem {
  padding: 120px 24px;
  background: var(--bg-surface);
  position: relative;
}

.problem-inner {
  max-width: 900px;
  margin: 0 auto;
}

.problem h2 {
  font-family: var(--font-display);
  font-size: clamp(28px, 4vw, 44px);
  font-weight: 700;
  line-height: 1.2;
  letter-spacing: -1px;
  margin-bottom: 64px;
}

.problem-stats {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 40px;
}

.stat {
  padding: 32px;
  background: var(--bg-card);
  border-radius: var(--radius);
  border: 1px solid var(--border);
  box-shadow: var(--shadow-sm);
}

.stat-number {
  font-family: var(--font-display);
  font-size: 42px;
  font-weight: 700;
  color: var(--accent-warm);
  display: block;
  margin-bottom: 12px;
}

.stat-desc {
  font-size: 15px;
  color: var(--fg-muted);
  line-height: 1.6;
}

/* ==================== DIAGNOSTIC ==================== */
.diagnostic {
  padding: 120px 24px;
  position: relative;
}

.diagnostic-inner {
  max-width: 900px;
  margin: 0 auto;
}

.diagnostic h2 {
  font-family: var(--font-display);
  font-size: clamp(28px, 4vw, 44px);
  font-weight: 700;
  line-height: 1.2;
  letter-spacing: -1px;
  margin-bottom: 64px;
}

.steps {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 32px;
}

.step {
  padding: 36px 28px;
  background: var(--bg-surface);
  border-radius: var(--radius);
  border: 1px solid var(--border);
  position: relative;
}

.step-num {
  font-family: var(--font-display);
  font-size: 48px;
  font-weight: 700;
  color: var(--accent);
  opacity: 0.2;
  margin-bottom: 16px;
  line-height: 1;
}

.step h3 {
  font-family: var(--font-display);
  font-size: 19px;
  font-weight: 600;
  margin-bottom: 12px;
  color: var(--fg);
}

.step p {
  font-size: 15px;
  color: var(--fg-muted);
  line-height: 1.65;
}

/* ==================== CHANNELS ==================== */
.channels {
  padding: 120px 24px;
  background: var(--bg-surface);
}

.channels-inner {
  max-width: 900px;
  margin: 0 auto;
}

.channels h2 {
  font-family: var(--font-display);
  font-size: clamp(28px, 4vw, 40px);
  font-weight: 700;
  line-height: 1.2;
  letter-spacing: -0.5px;
  margin-bottom: 48px;
}

.channel-grid {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
}

.channel-pill {
  font-family: var(--font-display);
  font-size: 14px;
  font-weight: 500;
  padding: 10px 20px;
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: 100px;
  color: var(--fg-muted);
  transition: all 0.2s;
}

.channel-pill:nth-child(3n+1) {
  border-color: rgba(37, 99, 235, 0.25);
  color: var(--accent);
}

.channel-pill:nth-child(5n+2) {
  border-color: rgba(245, 158, 11, 0.25);
  color: var(--accent-warm);
}

/* ==================== PHILOSOPHY ==================== */
.philosophy {
  padding: 120px 24px;
}

.philosophy-inner {
  max-width: 900px;
  margin: 0 auto;
}

blockquote {
  font-family: var(--font-display);
  font-size: clamp(22px, 3vw, 32px);
  font-weight: 500;
  line-height: 1.4;
  color: var(--fg);
  border-left: 3px solid var(--accent);
  padding-left: 32px;
  margin-bottom: 72px;
  font-style: italic;
}

.principles {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 32px;
}

.principle {
  padding: 28px;
  border-top: 3px solid var(--accent);
}

.principle:nth-child(2) { border-color: var(--accent-warm); }
.principle:nth-child(3) { border-color: #8b5cf6; }

.principle h3 {
  font-family: var(--font-display);
  font-size: 18px;
  font-weight: 600;
  margin-bottom: 12px;
}

.principle p {
  font-size: 15px;
  color: var(--fg-muted);
  line-height: 1.65;
}

/* ==================== CLOSING ==================== */
.closing {
  padding: 120px 24px;
  background: var(--bg-surface);
  position: relative;
  text-align: center;
  overflow: hidden;
}

.closing-inner {
  max-width: 700px;
  margin: 0 auto;
  position: relative;
  z-index: 2;
}

.closing h2 {
  font-family: var(--font-display);
  font-size: clamp(30px, 4vw, 48px);
  font-weight: 700;
  line-height: 1.15;
  letter-spacing: -1px;
  margin-bottom: 32px;
}

.closing-text {
  font-size: 18px;
  color: var(--fg-muted);
  line-height: 1.7;
  margin-bottom: 16px;
}

.closing-text:last-child {
  color: var(--fg);
  font-weight: 500;
}

.closing-glow {
  position: absolute;
  bottom: -300px;
  left: 50%;
  transform: translateX(-50%);
  width: 800px;
  height: 600px;
  background: radial-gradient(circle, var(--warm-light) 0%, transparent 60%);
  pointer-events: none;
  z-index: 1;
}

/* ==================== FOOTER ==================== */
.site-footer {
  padding: 40px 24px;
  border-top: 1px solid var(--border);
}

.footer-inner {
  max-width: 900px;
  margin: 0 auto;
  display: flex;
  justify-content: space-between;
  align-items: center;
}

.footer-brand {
  font-family: var(--font-display);
  font-size: 18px;
  font-weight: 700;
  color: var(--fg);
}

.footer-note {
  font-size: 13px;
  color: var(--fg-muted);
}

.closing-cta-btn {
  display: inline-block;
  font-family: var(--font-display);
  font-size: 16px;
  font-weight: 700;
  background: var(--accent);
  color: #fff;
  text-decoration: none;
  padding: 16px 36px;
  border-radius: 12px;
  transition: all 0.2s;
  box-shadow: var(--shadow-md);
}

.closing-cta-btn:hover {
  background: var(--accent-hover);
  transform: translateY(-2px);
  box-shadow: 0 6px 20px rgba(37,99,235,0.25);
}

/* ==================== RESPONSIVE ==================== */
@media (max-width: 768px) {
  .hero {
    padding: 80px 20px 60px;
    min-height: auto;
  }

  .hero-grid {
    grid-template-columns: 1fr;
    gap: 48px;
  }

  .problem-stats {
    grid-template-columns: 1fr;
    gap: 20px;
  }

  .steps {
    grid-template-columns: 1fr;
    gap: 20px;
  }

  .principles {
    grid-template-columns: 1fr;
    gap: 20px;
  }

  .footer-inner {
    flex-direction: column;
    gap: 12px;
    text-align: center;
  }

  blockquote {
    padding-left: 20px;
  }
}

@media (max-width: 480px) {
  .hero h1 {
    font-size: 32px;
  }

  .radar-card {
    padding: 24px 18px;
  }

  .ch-name {
    width: 80px;
    font-size: 13px;
  }

  .nav-links {
    display: none;
  }
}