/* ═══════════════════════════════════════════════════
   SENN Landing Page — Premium Dark Theme
   ═══════════════════════════════════════════════════ */

:root {
  --bg: #0a0a0f;
  --bg-elevated: #12121a;
  --bg-card: #16161f;
  --bg-card-hover: #1c1c28;
  --border: rgba(255, 255, 255, 0.1);
  --border-hover: rgba(255, 255, 255, 0.18);
  --border-soft: rgba(255, 255, 255, 0.06);

  --text-primary: #f0f0f5;
  --text-secondary: #8b8b9e;
  --text-muted: #8a8a9e;

  --accent: #6366f1;
  --accent-hover: #818cf8;
  --accent-glow: rgba(99, 102, 241, 0.3);
  --accent-gradient: linear-gradient(135deg, #6366f1 0%, #a855f7 50%, #ec4899 100%);

  --success: #22c55e;
  --warning: #f59e0b;

  --radius-sm: 8px;
  --radius-md: 12px;
  --radius-lg: 16px;
  --radius-xl: 24px;

  --font: "Inter", "Noto Sans JP", -apple-system, BlinkMacSystemFont, "Hiragino Sans", sans-serif;
}

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

html { scroll-behavior: smooth; }

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

a { color: inherit; text-decoration: none; }
ul { list-style: none; }

/* ─── Buttons ─── */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  font-family: var(--font);
  font-weight: 600;
  border: none;
  cursor: pointer;
  transition: all 0.2s ease;
  border-radius: var(--radius-md);
}
.btn-sm { padding: 8px 20px; font-size: 14px; }
.btn-md { padding: 12px 28px; font-size: 15px; }
.btn-lg { padding: 16px 36px; font-size: 16px; }
.btn-primary {
  background: var(--accent);
  color: white;
  box-shadow: 0 0 24px var(--accent-glow);
}
.btn-primary:hover {
  background: var(--accent-hover);
  transform: translateY(-1px);
  box-shadow: 0 4px 32px var(--accent-glow);
}
.btn-ghost {
  background: transparent;
  color: var(--text-secondary);
  border: 1px solid var(--border);
}
.btn-ghost:hover {
  border-color: var(--border-hover);
  color: var(--text-primary);
  background: rgba(255, 255, 255, 0.04);
}

/* Primary hero action — the single strongest CTA on the page */
.btn-download-primary {
  background: var(--accent-gradient);
  color: white;
  border: 1px solid rgba(255, 255, 255, 0.16);
  box-shadow: 0 0 40px var(--accent-glow), 0 12px 28px rgba(0, 0, 0, 0.35);
  gap: 10px;
}
.btn-download-primary:hover {
  transform: translateY(-2px);
  box-shadow: 0 0 56px var(--accent-glow), 0 16px 36px rgba(0, 0, 0, 0.4);
}
.btn-download-primary:active { transform: translateY(0); }

/* ═══════════════════════════════════════════════════
   Navigation
   ═══════════════════════════════════════════════════ */
.nav {
  position: fixed; top: 0; left: 0; right: 0; z-index: 100;
  padding: 16px 0;
  background: rgba(10, 10, 15, 0.8);
  backdrop-filter: blur(20px);
  border-bottom: 1px solid var(--border);
}
.nav-inner {
  max-width: 1200px; margin: 0 auto; padding: 0 24px;
  display: flex; align-items: center; justify-content: space-between;
}
.nav-logo {
  font-size: 20px; font-weight: 800; letter-spacing: -0.5px;
  display: flex; align-items: center; gap: 8px;
}
.logo-icon {
  background: var(--accent-gradient);
  -webkit-background-clip: text; -webkit-text-fill-color: transparent;
  font-size: 24px;
}
.nav-links {
  display: flex; align-items: center; gap: 32px;
}
.nav-links a { color: var(--text-secondary); font-size: 14px; font-weight: 500; transition: color 0.2s; }
.nav-links a:hover { color: var(--text-primary); }
.nav-github { display: flex; align-items: center; }
.lang-toggle {
  display: flex;
  border: 1px solid var(--border);
  border-radius: 100px;
  padding: 2px;
}
.lang-toggle-btn {
  padding: 4px 12px;
  font-family: var(--font);
  font-size: 12px;
  font-weight: 600;
  color: var(--text-secondary);
  background: transparent;
  border: none;
  border-radius: 100px;
  cursor: pointer;
  transition: all 0.2s ease;
}
.lang-toggle-btn:hover { color: var(--text-primary); }
.lang-toggle-btn.active {
  background: var(--accent);
  color: white;
}

/* ═══════════════════════════════════════════════════
   Hero
   ═══════════════════════════════════════════════════ */
.hero {
  position: relative;
  padding: 160px 24px 80px;
  text-align: center;
  overflow: hidden;
}
.hero-bg { position: absolute; inset: 0; pointer-events: none; }
.gradient-orb {
  position: absolute;
  border-radius: 50%;
  filter: blur(100px);
  opacity: 0.4;
}
.orb-1 { width: 600px; height: 600px; background: #6366f1; top: -200px; left: -100px; }
.orb-2 { width: 500px; height: 500px; background: #a855f7; top: -100px; right: -50px; }
.orb-3 { width: 400px; height: 400px; background: #ec4899; top: 200px; left: 40%; }

.hero-content {
  position: relative; z-index: 1;
  max-width: 800px; margin: 0 auto;
}
.hero-badge {
  display: inline-flex; align-items: center; gap: 8px;
  padding: 6px 16px;
  background: rgba(99, 102, 241, 0.1);
  border: 1px solid rgba(99, 102, 241, 0.2);
  border-radius: 100px;
  font-size: 13px; font-weight: 500; color: var(--accent-hover);
  margin-bottom: 32px;
}
.badge-dot {
  width: 6px; height: 6px; border-radius: 50%;
  background: var(--success);
  animation: pulse 2s infinite;
}
@keyframes pulse {
  0%, 100% { opacity: 1; }
  50% { opacity: 0.4; }
}
.hero-title {
  font-size: clamp(40px, 6vw, 72px);
  font-weight: 900;
  letter-spacing: -2px;
  line-height: 1.05;
  margin-bottom: 24px;
}
.hero-gradient {
  background: var(--accent-gradient);
  -webkit-background-clip: text; -webkit-text-fill-color: transparent;
}
.hero-subtitle {
  font-size: 18px;
  color: var(--text-secondary);
  max-width: 600px;
  margin: 0 auto 40px;
  line-height: 1.7;
}
.hero-cta {
  display: flex; gap: 16px; justify-content: center;
  margin-bottom: 40px;
}

/* Desktop Download Section */
.hero-download-section { margin-bottom: 56px; }
.download-container {
  display: flex; flex-direction: column; align-items: center; gap: 16px;
}
.download-btn {
  position: relative;
  display: inline-flex;
  align-items: center;
  gap: 8px;
}
.beta-badge {
  display: inline-block;
  padding: 2px 9px;
  background: rgba(255, 255, 255, 0.2);
  border: 1px solid rgba(255, 255, 255, 0.35);
  border-radius: 4px;
  font-size: 11px;
  font-weight: 700;
  color: white;
  letter-spacing: 0.5px;
}
.download-meta {
  display: flex;
  align-items: flex-start;
  justify-content: center;
  gap: 8px;
  flex-wrap: wrap;
  margin-top: 16px;
}
.meta-badge {
  display: inline-flex;
  align-items: center;
  padding: 6px 14px;
  background: rgba(255, 255, 255, 0.05);
  border: 1px solid var(--border);
  border-radius: 100px;
  font-size: 12px;
  font-weight: 500;
  color: var(--text-secondary);
  white-space: nowrap;
}
.meta-badge-interactive {
  cursor: pointer;
  color: var(--accent-hover);
  user-select: none;
  transition: all 0.2s ease;
}
.meta-badge-interactive:hover {
  border-color: var(--border-hover);
  color: var(--text-primary);
  background: rgba(255, 255, 255, 0.08);
}
.unsigned-warning { position: relative; }
.warning-details {
  position: absolute;
  top: calc(100% + 8px);
  left: 50%;
  transform: translateX(-50%);
  width: 320px;
  max-width: 80vw;
  margin-top: 0;
  padding: 16px 18px;
  background: var(--bg-elevated);
  border: 1px solid var(--border-hover);
  border-radius: var(--radius-md);
  box-shadow: 0 16px 48px rgba(0, 0, 0, 0.5);
  font-size: 13px;
  text-align: left;
  line-height: 1.6;
  z-index: 10;
}
.warning-details p { margin: 0 0 8px 0; color: var(--text-secondary); }
.warning-details p:last-child { margin-bottom: 0; }
.warning-details strong { color: var(--text-primary); }
.beta-note {
  font-size: 13px;
  color: var(--text-muted);
  line-height: 1.5;
  text-align: center;
  margin-top: 16px;
  max-width: 480px;
  margin-left: auto;
  margin-right: auto;
}
.beta-note a {
  color: var(--accent-hover);
  text-decoration: underline;
}
.beta-note a:hover { color: var(--accent); }

.manual-download {
  text-align: center;
  margin-top: 24px;
}
.manual-download p { font-size: 14px; color: var(--text-secondary); margin-bottom: 12px; }
.manual-buttons {
  display: flex;
  gap: 12px;
  justify-content: center;
  flex-wrap: wrap;
}

/* Secondary hero actions (below the primary download CTA) */
.hero-cta {
  display: flex; gap: 8px; justify-content: center;
  margin: 28px 0 48px;
}

/* Social proof — glassmorphism stat cards */
.hero-stats {
  display: grid;
  grid-template-columns: repeat(3, minmax(140px, 1fr));
  gap: 16px;
  max-width: 620px;
  margin: 0 auto;
}
.stat-card {
  display: flex; flex-direction: column; align-items: center;
  padding: 20px 12px;
  background: rgba(255, 255, 255, 0.045);
  backdrop-filter: blur(16px);
  -webkit-backdrop-filter: blur(16px);
  border: 1px solid var(--border);
  border-radius: var(--radius-lg);
  box-shadow: 0 8px 32px rgba(0, 0, 0, 0.25);
}
.stat-number {
  font-size: 22px; font-weight: 800;
  background: var(--accent-gradient);
  -webkit-background-clip: text; -webkit-text-fill-color: transparent;
  white-space: nowrap;
}
.stat-label { font-size: 12px; color: var(--text-muted); margin-top: 6px; }

/* Hero Screenshot */
.hero-screenshot {
  position: relative; z-index: 1;
  max-width: 1100px; margin: 64px auto 0;
}
.screenshot-frame {
  background: var(--bg-elevated);
  border: 1px solid var(--border);
  border-radius: var(--radius-xl);
  overflow: hidden;
  box-shadow: 0 24px 80px rgba(0, 0, 0, 0.5), 0 0 120px var(--accent-glow);
}
.screenshot-dots {
  display: flex; gap: 6px; padding: 14px 18px;
  border-bottom: 1px solid var(--border);
}
.screenshot-dots span {
  width: 10px; height: 10px; border-radius: 50%;
  background: rgba(255, 255, 255, 0.1);
}
.screenshot-dots span:nth-child(1) { background: #ff5f57; }
.screenshot-dots span:nth-child(2) { background: #febc2e; }
.screenshot-dots span:nth-child(3) { background: #28c840; }

/* App Mock */
.app-mock { display: flex; min-height: 420px; }
.mock-sidebar {
  width: 200px; padding: 20px 14px;
  background: rgba(0, 0, 0, 0.3);
  border-right: 1px solid var(--border);
}
.mock-logo {
  font-weight: 800; font-size: 16px; margin-bottom: 24px; padding-left: 8px;
}
.mock-nav-item {
  padding: 8px 12px; border-radius: var(--radius-sm);
  font-size: 13px; color: var(--text-secondary); cursor: default;
  margin-bottom: 4px;
}
.mock-nav-item.active { background: var(--accent); color: white; }
.mock-main { flex: 1; padding: 20px 24px; }
.mock-header {
  display: flex; justify-content: space-between; align-items: center;
  margin-bottom: 20px;
}
.mock-title { font-size: 20px; font-weight: 700; }
.mock-search {
  padding: 6px 16px; border-radius: var(--radius-sm);
  background: rgba(255, 255, 255, 0.04);
  border: 1px solid var(--border);
  color: var(--text-muted); font-size: 13px;
}
.mock-cards { display: grid; grid-template-columns: repeat(4, 1fr); gap: 12px; margin-bottom: 24px; }
.mock-card {
  padding: 16px; border-radius: var(--radius-md);
  background: rgba(255, 255, 255, 0.03);
  border: 1px solid var(--border);
}
.mc-num { display: block; font-size: 24px; font-weight: 800; }
.mc-label { font-size: 12px; color: var(--text-muted); }
.mc-open .mc-num { color: #90a4ae; }
.mc-progress .mc-num { color: #42a5f5; }
.mc-resolved .mc-num { color: #ffa726; }
.mc-closed .mc-num { color: #66bb6a; }
.mock-table {
  background: rgba(255, 255, 255, 0.02);
  border: 1px solid var(--border); border-radius: var(--radius-md);
}
.mock-row {
  display: flex; align-items: center; gap: 16px;
  padding: 10px 16px;
  border-bottom: 1px solid var(--border);
  font-size: 13px;
}
.mock-row:last-child { border-bottom: none; }
.mock-key { color: var(--accent-hover); font-weight: 600; width: 80px; }
.mock-ticket-title { flex: 1; }
.mock-badge {
  padding: 2px 10px; border-radius: 100px; font-size: 11px; font-weight: 600;
}
.mb-open { background: rgba(144, 164, 174, 0.15); color: #90a4ae; }
.mb-progress { background: rgba(66, 165, 245, 0.15); color: #42a5f5; }
.mb-resolved { background: rgba(255, 167, 38, 0.15); color: #ffa726; }
.mb-closed { background: rgba(102, 187, 106, 0.15); color: #66bb6a; }

/* ═══════════════════════════════════════════════════
   Demo Video
   ═══════════════════════════════════════════════════ */
.demo { padding: 100px 24px 120px; }
.demo-video-frame {
  max-width: 960px;
  margin: 0 auto;
  aspect-ratio: 16 / 9;
  background: var(--bg-elevated);
  border: 1px solid var(--border);
  border-radius: var(--radius-xl);
  box-shadow: 0 24px 80px rgba(0, 0, 0, 0.5);
  overflow: hidden;
  position: relative;
}
.demo-video {
  width: 100%;
  height: 100%;
  display: block;
  border: none;
}
.demo-video-placeholder {
  position: absolute; inset: 0;
  display: flex; flex-direction: column; align-items: center; justify-content: center;
  gap: 16px;
  background:
    linear-gradient(135deg, rgba(99, 102, 241, 0.08), rgba(168, 85, 247, 0.05)),
    var(--bg-elevated);
}
.demo-play-icon {
  display: flex; align-items: center; justify-content: center;
  width: 64px; height: 64px;
  border-radius: 50%;
  background: var(--accent-gradient);
  color: white;
  font-size: 20px;
  padding-left: 4px; /* optical centering for the ▶ glyph */
  box-shadow: 0 0 40px var(--accent-glow);
}
.demo-video-placeholder p { color: var(--text-secondary); font-size: 14px; }

/* ═══════════════════════════════════════════════════
   Sections Common
   ═══════════════════════════════════════════════════ */
.section-inner { max-width: 1200px; margin: 0 auto; padding: 0 24px; }
.section-header {
  text-align: center; max-width: 600px; margin: 0 auto 64px;
}
.section-badge {
  display: inline-block;
  padding: 4px 14px;
  background: rgba(99, 102, 241, 0.1);
  border: 1px solid rgba(99, 102, 241, 0.15);
  border-radius: 100px;
  font-size: 12px; font-weight: 600; color: var(--accent-hover);
  text-transform: uppercase; letter-spacing: 1px;
  margin-bottom: 20px;
}
.section-header h2 {
  font-size: clamp(28px, 4vw, 44px);
  font-weight: 800; letter-spacing: -1px; line-height: 1.15;
  margin-bottom: 16px;
}
.section-header p { color: var(--text-secondary); font-size: 16px; }

/* ═══════════════════════════════════════════════════
   Features
   ═══════════════════════════════════════════════════ */
.features { padding: 120px 24px; }
.features-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(260px, 1fr));
  gap: 16px;
}
.feature-card {
  padding: 32px;
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: var(--radius-lg);
  transition: all 0.3s ease;
}
.feature-card:hover {
  background: var(--bg-card-hover);
  border-color: var(--border-hover);
  transform: translateY(-2px);
}
.feature-highlight {
  grid-column: span 2;
  background: linear-gradient(135deg, rgba(99, 102, 241, 0.08), rgba(168, 85, 247, 0.05));
  border-color: rgba(99, 102, 241, 0.15);
}
.feature-icon { font-size: 32px; margin-bottom: 16px; }
.feature-card h3 { font-size: 18px; font-weight: 700; margin-bottom: 8px; }
.feature-card p { color: var(--text-secondary); font-size: 14px; line-height: 1.6; }

/* ═══════════════════════════════════════════════════
   Migration
   ═══════════════════════════════════════════════════ */
.migration { padding: 120px 24px; background: var(--bg-elevated); }
.migration-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(240px, 1fr));
  gap: 16px;
}
.migration-card {
  padding: 32px; text-align: center;
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: var(--radius-lg);
  transition: all 0.3s ease;
}
.migration-card:hover {
  border-color: var(--border-hover);
  transform: translateY(-2px);
}
.migration-logo { font-size: 40px; margin-bottom: 16px; }
.migration-card h3 { font-size: 18px; font-weight: 700; margin-bottom: 8px; }
.migration-card p { color: var(--text-secondary); font-size: 14px; margin-bottom: 16px; }
.migration-time {
  display: inline-block;
  padding: 4px 12px; border-radius: 100px;
  background: rgba(34, 197, 94, 0.1);
  color: var(--success);
  font-size: 12px; font-weight: 600;
}

/* ═══════════════════════════════════════════════════
   Pricing
   ═══════════════════════════════════════════════════ */
.pricing { padding: 120px 24px; }
.pricing-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 16px;
  max-width: 900px;
  margin: 0 auto;
}
.pricing-single {
  grid-column: 1 / -1;
  max-width: 320px;
  margin: 0 auto;
}
.pricing-card {
  padding: 36px 28px;
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: var(--radius-lg);
  position: relative;
}
.pricing-pro {
  border-color: var(--accent);
  box-shadow: 0 0 40px var(--accent-glow);
}
.pricing-popular {
  position: absolute; top: -12px; left: 50%; transform: translateX(-50%);
  padding: 4px 16px; border-radius: 100px;
  background: var(--accent);
  color: white; font-size: 11px; font-weight: 700; text-transform: uppercase;
  letter-spacing: 0.5px;
}
.pricing-tier { font-size: 14px; font-weight: 600; color: var(--text-secondary); margin-bottom: 8px; }
.pricing-price {
  font-size: 40px; font-weight: 900; margin-bottom: 8px;
}
.pricing-price span { font-size: 14px; font-weight: 500; color: var(--text-muted); }
.pricing-desc { color: var(--text-secondary); font-size: 14px; margin-bottom: 24px; }
.pricing-features { margin-bottom: 28px; }
.pricing-features li {
  padding: 6px 0; font-size: 14px; color: var(--text-secondary);
}
.pricing-card .btn { width: 100%; }

/* ═══════════════════════════════════════════════════
   CTA
   ═══════════════════════════════════════════════════ */
.cta {
  padding: 120px 24px;
  text-align: center;
  background: linear-gradient(180deg, var(--bg) 0%, rgba(99, 102, 241, 0.05) 100%);
}
.cta h2 { font-size: 40px; font-weight: 900; margin-bottom: 16px; }
.cta p { color: var(--text-secondary); margin-bottom: 32px; font-size: 18px; }

/* ═══════════════════════════════════════════════════
   Footer
   ═══════════════════════════════════════════════════ */
.footer { padding: 80px 24px 32px; border-top: 1px solid var(--border); }
.footer-inner {
  max-width: 1200px; margin: 0 auto;
  display: flex; justify-content: space-between;
}
.footer-brand { max-width: 200px; }
.footer-brand p { color: var(--text-muted); font-size: 13px; margin-top: 8px; }
.footer-links { display: flex; gap: 80px; }
.footer-col h4 { font-size: 13px; font-weight: 600; margin-bottom: 16px; color: var(--text-secondary); }
.footer-col a {
  display: block; font-size: 13px; color: var(--text-muted);
  padding: 4px 0; transition: color 0.2s;
}
.footer-col a:hover { color: var(--text-primary); }
.footer-bottom {
  max-width: 1200px; margin: 48px auto 0;
  padding-top: 24px;
  border-top: 1px solid var(--border);
  text-align: center;
}
.footer-bottom p { color: var(--text-muted); font-size: 12px; }

/* ═══════════════════════════════════════════════════
   Responsive
   ═══════════════════════════════════════════════════ */
@media (max-width: 768px) {
  .nav-links a:not(.btn):not(.nav-github) { display: none; }
  .nav-links .btn-sm { display: none; }
  .nav-links { gap: 12px; }
  .lang-toggle { padding: 1px; }
  .lang-toggle-btn { padding: 4px 8px; font-size: 11px; }
  .hero-stats { grid-template-columns: 1fr; max-width: 280px; }
  .download-meta { flex-direction: column; align-items: center; }
  .warning-details { width: 260px; max-width: calc(100vw - 40px); }
  .feature-highlight { grid-column: span 1; }
  .pricing-grid { grid-template-columns: 1fr; }
  .hero-stats { flex-direction: column; gap: 16px; }
  .stat-divider { width: 40px; height: 1px; }
  .footer-inner { flex-direction: column; gap: 40px; }
  .footer-links { gap: 40px; }
  .mock-sidebar { display: none; }
  .mock-cards { grid-template-columns: repeat(2, 1fr); }
}