/* ============================================================
   THREADS CONSULT — Apple Aesthetic & Secure Vault
   Minimalist Luxury (Deep Black / Light Grey)
   ============================================================ */

@import url('https://fonts.googleapis.com/css2?family=Inter:wght@300;400;500;600;700&family=Noto+Sans+JP:wght@300;400;500;700&display=swap');

:root {
  --bg-base:       #000000;
  --bg-surface:    #161617;
  --bg-elevated:   #1d1d1f;
  
  /* Apple Blue to Purple Accent */
  --accent:        #5E5CE6;
  --accent-glow:   rgba(94, 92, 230, 0.15);
  
  --text-primary:  #f5f5f7;
  --text-secondary:#86868b;
  
  --border:        #333333;
  --radius-sm:     8px;
  --radius-md:     16px;
  --radius-lg:     24px;
  
  --font-sans:     'Inter', 'Noto Sans JP', -apple-system, sans-serif;
  --transition:    all 0.4s cubic-bezier(0.25, 1, 0.5, 1);
}

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

body {
  font-family: var(--font-sans);
  background-color: var(--bg-base);
  color: var(--text-primary);
  line-height: 1.6;
  letter-spacing: -0.02em;
  -webkit-font-smoothing: antialiased;
}

/* ============================================================
   SECURITY LOCK SCREEN
   ============================================================ */
#lock-screen {
  position: fixed;
  inset: 0;
  background: var(--bg-surface);
  z-index: 9999;
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  padding: 2rem;
  transition: opacity 0.5s ease, transform 0.5s ease;
}

#lock-screen.hidden {
  opacity: 0;
  pointer-events: none;
  transform: scale(1.02);
}

.lock-box {
  width: 100%;
  max-width: 320px;
  text-align: center;
}

.lock-icon { font-size: 48px; margin-bottom: 24px; display: block; }
.lock-title { font-size: 1.5rem; font-weight: 700; margin-bottom: 8px; }
.lock-sub { font-size: 0.95rem; color: var(--text-secondary); margin-bottom: 32px; }

.lock-input {
  width: 100%;
  padding: 14px 16px;
  background: var(--bg-elevated);
  border: 1px solid var(--border);
  border-radius: var(--radius-sm);
  color: #fff;
  font-size: 16px;
  text-align: center;
  outline: none;
  margin-bottom: 16px;
  transition: var(--transition);
}

.lock-input:focus {
  border-color: var(--accent);
  box-shadow: 0 0 0 4px var(--accent-glow);
}

.btn-auth {
  width: 100%;
  padding: 14px;
  background: var(--text-primary);
  color: var(--bg-base);
  border: none;
  border-radius: var(--radius-sm);
  font-size: 1rem;
  font-weight: 600;
  cursor: pointer;
  transition: var(--transition);
}

.btn-auth:hover { background: #d2d2d7; }

/* ============================================================
   MAIN LAYOUT & HEADER
   ============================================================ */
#app { display: none; }

header {
  position: sticky;
  top: 0;
  z-index: 100;
  background: rgba(0, 0, 0, 0.8);
  backdrop-filter: saturate(180%) blur(20px);
  -webkit-backdrop-filter: saturate(180%) blur(20px);
  border-bottom: 1px solid var(--border);
}

.header-inner {
  max-width: 1200px;
  margin: 0 auto;
  height: 56px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 0 24px;
}

.logo { font-size: 1.2rem; font-weight: 700; color: #fff; text-decoration: none; }
.btn-outline {
  padding: 6px 16px;
  border: 1px solid var(--border);
  border-radius: 99px;
  color: #fff;
  font-size: 0.85rem;
  font-weight: 500;
  text-decoration: none;
  transition: var(--transition);
}
.btn-outline:hover { background: #fff; color: #000; }

/* ============================================================
   HERO SECTION
   ============================================================ */
.hero {
  padding: 120px 24px 80px;
  text-align: center;
  max-width: 900px;
  margin: 0 auto;
}

.hero-badge {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 6px 16px;
  background: var(--bg-elevated);
  border: 1px solid var(--border);
  border-radius: 99px;
  font-size: 0.85rem;
  color: var(--text-secondary);
  margin-bottom: 32px;
}

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

.hero-title {
  font-size: clamp(2.5rem, 6vw, 4.5rem);
  font-weight: 800;
  line-height: 1.15;
  letter-spacing: -0.04em;
  margin-bottom: 24px;
}

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

.hero-sub {
  font-size: clamp(1rem, 2.5vw, 1.25rem);
  color: var(--text-secondary);
  max-width: 600px;
  margin: 0 auto 48px;
  line-height: 1.8;
}

.hero-actions {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 16px;
  flex-wrap: wrap;
}

.btn-primary {
  padding: 16px 32px;
  background: var(--accent);
  color: #fff;
  font-size: 1rem;
  font-weight: 600;
  border-radius: var(--radius-sm);
  text-decoration: none;
  transition: var(--transition);
}

.btn-primary:hover { background: #6c6aea; transform: scale(1.02); }

.btn-secondary {
  padding: 16px 32px;
  background: var(--bg-elevated);
  color: #fff;
  font-size: 1rem;
  font-weight: 600;
  border-radius: var(--radius-sm);
  text-decoration: none;
  border: 1px solid var(--border);
  transition: var(--transition);
}

.btn-secondary:hover { background: var(--bg-surface); }

/* ============================================================
   FEATURES SECTION
   ============================================================ */
.section { padding: 80px 24px; }
.section-title { text-align: center; font-size: 2.5rem; font-weight: 800; margin-bottom: 16px; }
.section-sub { text-align: center; color: var(--text-secondary); margin-bottom: 64px; }

.container { max-width: 1200px; margin: 0 auto; }

.feature-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
  gap: 24px;
}

.feature-card {
  background: var(--bg-surface);
  border: 1px solid var(--border);
  border-radius: var(--radius-md);
  padding: 32px;
  transition: var(--transition);
}

.feature-card:hover { border-color: #555; transform: translateY(-4px); }

.f-icon {
  width: 48px; height: 48px;
  background: var(--bg-elevated);
  border-radius: 12px;
  display: flex; align-items: center; justify-content: center;
  font-size: 20px;
  margin-bottom: 24px;
  border: 1px solid var(--border);
}

.f-title { font-size: 1.25rem; font-weight: 700; margin-bottom: 12px; }
.f-desc { font-size: 0.95rem; color: var(--text-secondary); line-height: 1.7; }

/* ============================================================
   STEPS SECTION
   ============================================================ */
.step-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(240px, 1fr));
  gap: 24px;
}

.step-card {
  text-align: center;
  padding: 40px 24px;
  background: var(--bg-surface);
  border-radius: var(--radius-lg);
  border: 1px solid var(--border);
}

.step-circle {
  width: 64px; height: 64px;
  background: var(--bg-elevated);
  border: 1px solid var(--border);
  border-radius: 50%;
  display: flex; align-items: center; justify-content: center;
  font-size: 1.5rem; font-weight: 800; color: var(--accent);
  margin: 0 auto 24px;
}

.step-title { font-size: 1.2rem; font-weight: 700; margin-bottom: 12px; }
.step-desc { font-size: 0.9rem; color: var(--text-secondary); }

/* ============================================================
   CTA & FOOTER
   ============================================================ */
.cta-box {
  background: linear-gradient(135deg, var(--bg-surface) 0%, #1a1a2e 100%);
  border: 1px solid var(--accent-glow);
  border-radius: var(--radius-lg);
  padding: 80px 24px;
  text-align: center;
  margin-top: 40px;
}

.cta-box h2 { font-size: 2.5rem; margin-bottom: 24px; }
.cta-box p { color: var(--text-secondary); margin-bottom: 40px; }

footer {
  text-align: center;
  padding: 40px 24px;
  color: var(--text-secondary);
  font-size: 0.85rem;
  border-top: 1px solid var(--border);
  margin-top: 80px;
}