/* 
 * Guitar Practice App - Legal Hub Stylesheet
 * Brand Theme: Slate Dark Mode (matches Flutter DesignSystem)
 */

@import url('https://fonts.googleapis.com/css2?family=Inter:wght@300;400;500;600;700&family=Outfit:wght@400;500;600;700;800&display=swap');

:root {
  --bg-color: #0F172A;
  --surface-color: #1E293B;
  --surface-border: rgba(255, 255, 255, 0.08);
  --primary-color: #38BDF8;
  --primary-hover: #0EA5E9;
  --secondary-color: #818CF8;
  --text-main: #F8FAFC;
  --text-dim: #94A3B8;
  --text-accent: #38BDF8;
  --glow-shadow: 0 0 25px rgba(56, 189, 248, 0.15);
  --soft-shadow: 0 10px 30px -10px rgba(0, 0, 0, 0.5);
  --transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
}

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

body {
  font-family: 'Inter', system-ui, -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, sans-serif;
  background-color: var(--bg-color);
  color: var(--text-main);
  line-height: 1.8;
  letter-spacing: 0.02em;
  min-height: 100vh;
  display: flex;
  flex-direction: column;
  overflow-x: hidden;
}

/* Background Gradients */
body::before {
  content: "";
  position: absolute;
  top: -10%;
  left: 50%;
  transform: translateX(-50%);
  width: 1000px;
  height: 600px;
  background: radial-gradient(circle, rgba(56, 189, 248, 0.08) 0%, rgba(129, 140, 248, 0.03) 50%, rgba(15, 23, 42, 0) 100%);
  z-index: -1;
  pointer-events: none;
}

/* Header / Navigation */
header {
  width: 100%;
  padding: 1.5rem 2rem;
  background: rgba(15, 23, 42, 0.7);
  backdrop-filter: blur(12px);
  -webkit-backdrop-filter: blur(12px);
  border-bottom: 1px solid var(--surface-border);
  position: sticky;
  top: 0;
  z-index: 100;
}

.header-container {
  max-width: 1000px;
  margin: 0 auto;
  display: flex;
  justify-content: space-between;
  align-items: center;
}

.logo-link {
  display: flex;
  align-items: center;
  gap: 0.75rem;
  text-decoration: none;
  color: var(--text-main);
  transition: var(--transition);
}

.logo-link:hover {
  opacity: 0.9;
  transform: translateY(-1px);
}

.logo-icon {
  width: 36px;
  height: 36px;
  background: linear-gradient(135deg, var(--primary-color), var(--secondary-color));
  border-radius: 10px;
  display: flex;
  align-items: center;
  justify-content: center;
  box-shadow: 0 4px 10px rgba(56, 189, 248, 0.3);
}

.logo-icon svg {
  width: 20px;
  height: 20px;
  fill: #0F172A;
}

.logo-text {
  font-family: 'Outfit', sans-serif;
  font-size: 1.25rem;
  font-weight: 700;
  letter-spacing: -0.01em;
  background: linear-gradient(135deg, #FFFFFF 30%, #CBD5E1 100%);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
}

/* Header Navigation */
.header-nav {
  display: flex;
  gap: 1.5rem;
  align-items: center;
  margin-left: auto;
  margin-right: 2rem;
}

.header-nav-link {
  color: var(--text-dim);
  text-decoration: none;
  font-size: 0.95rem;
  font-weight: 600;
  transition: var(--transition);
  display: flex;
  align-items: center;
  gap: 0.35rem;
}

.header-nav-link:hover {
  color: var(--primary-color);
  text-shadow: 0 0 10px rgba(56, 189, 248, 0.3);
}

/* Controls */
.controls-container {
  display: flex;
  align-items: center;
  gap: 1rem;
}

.lang-selector {
  background: rgba(30, 41, 59, 0.6);
  border: 1px solid var(--surface-border);
  border-radius: 9999px;
  padding: 0.25rem;
  display: flex;
  gap: 0.25rem;
}

.lang-btn {
  background: transparent;
  border: none;
  color: var(--text-dim);
  padding: 0.5rem 1.25rem;
  font-size: 0.85rem;
  font-weight: 600;
  border-radius: 9999px;
  cursor: pointer;
  transition: var(--transition);
}

.lang-btn:hover {
  color: var(--text-main);
}

.lang-btn.active {
  background: var(--primary-color);
  color: #0F172A;
  box-shadow: 0 2px 8px rgba(56, 189, 248, 0.3);
}

.print-btn {
  background: rgba(30, 41, 59, 0.6);
  border: 1px solid var(--surface-border);
  color: var(--text-dim);
  border-radius: 9999px;
  width: 38px;
  height: 38px;
  display: flex;
  align-items: center;
  justify-content: center;
  cursor: pointer;
  transition: var(--transition);
}

.print-btn:hover {
  color: var(--text-main);
  background: var(--surface-color);
  border-color: var(--primary-color);
  box-shadow: 0 0 15px rgba(56, 189, 248, 0.1);
}

/* Main Content Layout */
main {
  flex: 1;
  max-width: 1000px;
  width: 100%;
  margin: 3rem auto;
  padding: 0 2rem;
}

.document-card {
  background-color: var(--surface-color);
  border: 1px solid var(--surface-border);
  border-radius: 24px;
  padding: 3rem;
  box-shadow: var(--soft-shadow), var(--glow-shadow);
  position: relative;
  overflow: hidden;
}

.document-card::after {
  content: "";
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  height: 4px;
  background: linear-gradient(90deg, var(--primary-color), var(--secondary-color));
}

/* Typography & Content styling */
h1 {
  font-family: 'Outfit', sans-serif;
  font-size: 2.25rem;
  font-weight: 800;
  margin-bottom: 0.5rem;
  background: linear-gradient(135deg, #FFFFFF 40%, var(--primary-color) 100%);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
}

.last-updated {
  font-size: 0.9rem;
  color: var(--text-dim);
  margin-bottom: 2.5rem;
  display: flex;
  align-items: center;
  gap: 0.5rem;
}

.last-updated::before {
  content: "";
  display: inline-block;
  width: 6px;
  height: 6px;
  border-radius: 50%;
  background-color: var(--primary-color);
}

.legal-text {
  font-size: 1.05rem;
  color: #E2E8F0;
  text-align: justify;
}

.legal-text h2 {
  font-family: 'Outfit', sans-serif;
  font-size: 1.4rem;
  font-weight: 700;
  color: var(--text-main);
  margin: 2rem 0 1rem 0;
  border-bottom: 1px solid rgba(255, 255, 255, 0.05);
  padding-bottom: 0.5rem;
  display: flex;
  align-items: center;
}

.legal-text p {
  margin-bottom: 1.25rem;
}

.legal-text ul {
  margin-bottom: 1.5rem;
  padding-left: 1.5rem;
  list-style-type: none;
}

.legal-text ul li {
  margin-bottom: 0.75rem;
  position: relative;
}

.legal-text ul li::before {
  content: "•";
  color: var(--primary-color);
  font-weight: bold;
  display: inline-block;
  width: 1em;
  margin-left: -1em;
  position: absolute;
}

.intro-lead {
  font-size: 1.15rem;
  color: var(--text-main);
  margin-bottom: 2rem;
  border-left: 3px solid var(--primary-color);
  padding-left: 1rem;
}

/* Nav Links inside Document */
.doc-nav-links {
  display: flex;
  gap: 1rem;
  margin-bottom: 2.5rem;
  border-bottom: 1px solid var(--surface-border);
  padding-bottom: 1rem;
}

.doc-nav-link {
  color: var(--text-dim);
  text-decoration: none;
  font-size: 0.95rem;
  font-weight: 600;
  transition: var(--transition);
  padding-bottom: 1rem;
  position: relative;
}

.doc-nav-link:hover {
  color: var(--text-main);
}

.doc-nav-link.active {
  color: var(--primary-color);
}

.doc-nav-link.active::after {
  content: "";
  position: absolute;
  bottom: -1px;
  left: 0;
  right: 0;
  height: 2px;
  background-color: var(--primary-color);
  box-shadow: 0 0 8px var(--primary-color);
}

/* Landing Page Specific Styles */
.hero {
  text-align: center;
  padding: 4rem 1rem;
  max-width: 800px;
  margin: 0 auto;
}

.hero-tagline {
  font-family: 'Outfit', sans-serif;
  font-size: 3rem;
  font-weight: 800;
  line-height: 1.2;
  margin-bottom: 1.5rem;
  background: linear-gradient(135deg, #FFFFFF 40%, var(--primary-color) 70%, var(--secondary-color) 100%);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
}

.hero-description {
  color: var(--text-dim);
  font-size: 1.25rem;
  margin-bottom: 3rem;
  max-width: 600px;
  margin-left: auto;
  margin-right: auto;
}

.cta-group {
  display: flex;
  gap: 1.5rem;
  justify-content: center;
  flex-wrap: wrap;
}

.btn {
  font-family: 'Outfit', sans-serif;
  text-decoration: none;
  padding: 0.85rem 2rem;
  font-size: 1rem;
  font-weight: 700;
  border-radius: 14px;
  cursor: pointer;
  transition: var(--transition);
  display: flex;
  align-items: center;
  gap: 0.5rem;
}

.btn-primary {
  background: linear-gradient(135deg, var(--primary-color), var(--secondary-color));
  color: #0F172A;
  box-shadow: 0 4px 20px rgba(56, 189, 248, 0.25);
}

.btn-primary:hover {
  transform: translateY(-2px);
  box-shadow: 0 6px 25px rgba(56, 189, 248, 0.35);
}

.btn-secondary {
  background: rgba(30, 41, 59, 0.6);
  color: var(--text-main);
  border: 1px solid var(--surface-border);
}

.btn-secondary:hover {
  background: var(--surface-color);
  border-color: var(--primary-color);
  transform: translateY(-2px);
  box-shadow: var(--glow-shadow);
}

/* Footer */
footer {
  width: 100%;
  padding: 3rem 2rem;
  border-top: 1px solid var(--surface-border);
  background: rgba(15, 23, 42, 0.9);
  text-align: center;
  color: var(--text-dim);
  font-size: 0.9rem;
}

.footer-container {
  max-width: 1000px;
  margin: 0 auto;
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 1rem;
}

.footer-links {
  display: flex;
  gap: 1.5rem;
}

.footer-links a {
  color: var(--text-dim);
  text-decoration: none;
  transition: var(--transition);
}

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

/* Language Selection Displays */
.lang-ja {
  display: block; /* Managed by JS, default is block, but overridden by script */
}

.lang-en {
  display: none; /* Managed by JS */
}

/* Responsive adjustments */
@media (max-width: 768px) {
  main {
    margin: 1.5rem auto;
    padding: 0 1rem;
  }
  .document-card {
    padding: 2rem 1.5rem;
    border-radius: 18px;
  }
  h1 {
    font-size: 1.75rem;
  }
  .hero-tagline {
    font-size: 2.25rem;
  }
}

/* Print Styling */
@media print {
  body {
    background: #FFFFFF !important;
    color: #000000 !important;
  }
  header, footer, .lang-selector, .print-btn, .doc-nav-links, body::before {
    display: none !important;
  }
  main {
    margin: 0 !important;
    padding: 0 !important;
    max-width: 100% !important;
  }
  .document-card {
    background: transparent !important;
    border: none !important;
    box-shadow: none !important;
    padding: 0 !important;
  }
  h1 {
    color: #000000 !important;
    -webkit-text-fill-color: initial !important;
  }
  .legal-text {
    color: #000000 !important;
  }
  .legal-text h2 {
    color: #000000 !important;
    border-bottom-color: #000000 !important;
  }
  .legal-text ul li::before {
    color: #000000 !important;
  }
}