/* TERMS OF USE — EXPERT WEB TOOLS */

@font-face { font-family: 'Inter'; src: url('/fonts/inter-v20-latin-regular.woff2') format('woff2'); font-weight: 400; font-display: swap; }
@font-face { font-family: 'Orbitron'; src: url('/fonts/orbitron-v35-latin-700.woff2') format('woff2'); font-weight: 700; font-display: swap; }

:root {
  --bg-main:          #0a0a0f;
  --primary-accent:   #3b82f6;
  --secondary-accent: #8b5cf6;
  --text-main:        #ffffff;
  --text-muted:       #94a3b8;
  --card-bg:          rgba(25, 25, 35, 0.6);
  --card-border:      rgba(255, 255, 255, 0.08);
  --input-bg:         rgba(255, 255, 255, 0.05);
  --font-heading:     'Orbitron', sans-serif;
  --font-body:        'Inter', sans-serif;
}

/* Light Theme Variables */
html.light-theme {
  --bg-main:          #f8fafc;
  --primary-accent:   #2563eb;
  --secondary-accent: #7c3aed;
  --text-main:        #0f172a;
  --text-muted:       #475569;
  --card-bg:          #ffffff;
  --card-border:      #e2e8f0;
  --input-bg:         #f1f5f9;
}

*, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }
html, body {
  width: 100%;
  transition: background-color 0.2s ease;
}

body {
  background-color: var(--bg-main);
  color: var(--text-main);
  font-family: var(--font-body);
  line-height: 1.7;
  min-height: 100vh;
  display: flex;
  flex-direction: column;
}

/* Background Glow */
.background-glow {
  position: fixed; top: -50%; left: -50%; width: 200%; height: 200%;
  background: radial-gradient(circle at center, rgba(59,130,246,0.06) 0%, rgba(10,10,15,0) 50%);
  z-index: -1; pointer-events: none;
  transition: background 0.3s ease;
}
html.light-theme .background-glow {
  background: radial-gradient(circle at center, rgba(59,130,246,0.03) 0%, rgba(255,255,255,0) 50%);
}

.sr-only { position: absolute; width: 1px; height: 1px; padding: 0; margin: -1px; overflow: hidden; clip: rect(0,0,0,0); white-space: nowrap; border-width: 0; }

/* Header & Theme Toggle */
.tool-header {
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding: 1.5rem 5%;
  max-width: 1400px;
  margin: 0 auto;
  width: 100%;
  gap: 10px;
}

.back-btn {
  color: var(--text-muted);
  text-decoration: none;
  display: flex;
  align-items: center;
  gap: 8px;
  font-size: 0.95rem;
  transition: color 0.3s;
  flex-shrink: 0;
}
.back-btn:hover { color: var(--primary-accent); }
.back-btn:focus-visible { outline: 2px solid var(--primary-accent); border-radius: 4px; }

.logo {
  font-family: var(--font-heading);
  font-size: 1.2rem;
  color: var(--text-main);
  margin: 0 auto;
}
.logo span { color: var(--primary-accent); }

/* Theme Toggle Button Standardized */
.theme-toggle-btn {
    background: transparent; border: none; cursor: pointer; color: var(--text-muted); 
    font-size: 1.25rem; display: flex; align-items: center; justify-content: center;
    padding: 6px; border-radius: 50%; transition: color 0.2s;
    width: 44px; height: 44px; flex-shrink: 0;
}
.theme-toggle-btn:hover { color: var(--primary-accent); }
.theme-toggle-btn:focus-visible { outline: 2px solid var(--primary-accent); border-radius: 4px; }
.theme-toggle-btn i { pointer-events: none; }

/* Main Content */
.main-content {
  flex-grow: 1;
  padding: 2rem 5% 4rem;
  max-width: 860px;
  margin: 0 auto;
  width: 100%;
  min-width: 0;
}

/* Page Intro */
.page-intro {
  text-align: center;
  margin-bottom: 2.5rem;
  padding-bottom: 2rem;
  border-bottom: 1px solid var(--card-border);
}

.page-intro h1 {
  font-family: var(--font-heading);
  font-size: 1.9rem;
  line-height: 1.3;
  margin-bottom: 0.5rem;
  background: linear-gradient(to right, #ffffff, #94a3b8);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
}
html.light-theme .page-intro h1 {
  background: linear-gradient(to right, #0f172a, #475569);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
}

.page-intro time {
  color: var(--text-muted);
  font-size: 0.9rem;
}

/* Table of Contents */
.toc-nav {
  background: var(--card-bg);
  border: 1px solid var(--card-border);
  border-radius: 12px;
  padding: 1.5rem;
  margin-bottom: 2.5rem;
  backdrop-filter: blur(10px);
}

.toc-nav h2 {
  font-family: var(--font-heading);
  font-size: 0.85rem;
  color: var(--text-muted);
  text-transform: uppercase;
  letter-spacing: 1.5px;
  margin-bottom: 1rem;
}

.toc-nav ol {
  list-style: decimal;
  padding-left: 1.4rem;
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 0.4rem 2rem;
}

.toc-nav ol li a {
  display: block;
  color: var(--text-muted);
  text-decoration: none;
  font-size: 0.9rem;
  transition: color 0.2s, background 0.2s;
  padding: 6px 10px;
  border-radius: 6px;
  margin-left: -10px;
}
.toc-nav ol li a:hover, .toc-nav ol li a.active { 
  color: var(--primary-accent); 
  background: rgba(59,130,246,0.08);
}
html.light-theme .toc-nav ol li a:hover, html.light-theme .toc-nav ol li a.active {
  color: #1d4ed8; 
  background: rgba(37,99,235,0.08);
}
.toc-nav ol li a:focus-visible { outline: 2px solid var(--primary-accent); }

/* Terms Body Sections */
.terms-section {
  margin-bottom: 2.5rem;
  padding-bottom: 2.5rem;
  border-bottom: 1px solid var(--card-border);
}
.terms-section:last-child {
  border-bottom: none;
  margin-bottom: 0;
  padding-bottom: 0;
}

.terms-section h2 {
  font-family: var(--font-heading);
  font-size: 1.05rem;
  color: var(--text-main);
  margin-bottom: 1rem;
  display: flex;
  align-items: center;
  gap: 10px;
  scroll-margin-top: 2rem;
}

.terms-section h2 i {
  color: var(--primary-accent);
  font-size: 1rem;
  flex-shrink: 0;
}

.terms-section p {
  color: var(--text-muted);
  font-size: 0.97rem;
  margin-bottom: 0.9rem;
  line-height: 1.75;
}
.terms-section p:last-child { margin-bottom: 0; }

.terms-section ul, .terms-section ol {
  color: var(--text-muted);
  font-size: 0.95rem;
  padding-left: 1.5rem;
  margin: 0.75rem 0 1rem;
  line-height: 1.8;
}
.terms-section ul li, .terms-section ol li { margin-bottom: 0.4rem; }

.terms-section a {
  color: var(--primary-accent);
  text-decoration: none;
  border-bottom: 1px dotted rgba(59,130,246,0.4);
  transition: color 0.2s, border-color 0.2s;
}
.terms-section a:hover { color: #93c5fd; border-bottom-color: #93c5fd; }
html.light-theme .terms-section a:hover { color: #1d4ed8; border-bottom-color: #1d4ed8; }

.terms-section strong {
  color: var(--text-main);
  font-weight: 600;
}

/* Highlight Box */
.highlight-box {
  display: flex;
  align-items: flex-start;
  gap: 12px;
  background: rgba(59, 130, 246, 0.08);
  border: 1px solid rgba(59, 130, 246, 0.25);
  border-radius: 8px;
  padding: 14px 16px;
  margin-top: 1.2rem;
  font-size: 0.95rem;
  color: #e2e8f0;
  line-height: 1.6;
}
html.light-theme .highlight-box { color: #334155; }

.highlight-box i {
  color: var(--primary-accent);
  font-size: 1.1rem;
  margin-top: 2px;
  flex-shrink: 0;
}

/* Contact Box */
.contact-box {
  background: var(--card-bg);
  border: 1px solid var(--card-border);
  border-radius: 10px;
  padding: 1.2rem 1.5rem;
  margin-top: 1rem;
  display: flex;
  flex-direction: column;
  gap: 0.75rem;
}

.contact-row {
  display: flex;
  align-items: center;
  gap: 12px;
  font-size: 0.95rem;
}

.contact-row i {
  color: var(--primary-accent);
  width: 18px;
  text-align: center;
  flex-shrink: 0;
}

.contact-row a {
  color: var(--text-muted);
  text-decoration: none;
  transition: color 0.2s;
  border-bottom: none;
}
.contact-row a:hover { color: var(--primary-accent); }
.contact-row a:focus-visible { outline: 2px solid var(--primary-accent); border-radius: 2px; }

/* Footer */
footer {
  text-align: center;
  padding: 2.5rem 0;
  color: var(--text-muted);
  font-size: 0.9rem;
  border-top: 1px solid var(--card-border);
  margin-top: 1rem;
}

footer a { color: var(--text-main); text-decoration: none; }
footer a:hover { color: var(--primary-accent); }

/* Back to Top Button */
.back-to-top {
  position: fixed; bottom: 28px; right: 28px;
  background: var(--primary-accent); color: #fff;
  border: none; border-radius: 50%;
  width: 44px; height: 44px;
  display: flex; align-items: center; justify-content: center;
  cursor: pointer; font-size: 1rem;
  box-shadow: 0 4px 15px rgba(59,130,246,0.4);
  transition: opacity 0.3s, transform 0.3s, background 0.2s;
  opacity: 0; pointer-events: none; z-index: 100;
}
.back-to-top.visible { opacity: 1; pointer-events: auto; }
.back-to-top:hover { background: #2563eb; transform: translateY(-2px); }
.back-to-top:focus-visible { outline: 2px solid var(--text-main); outline-offset: 2px; }

/* Responsive */
@media (max-width: 640px) {
  .tool-header { padding: 1rem 4%; flex-direction: column; align-items: flex-start; gap: 10px; }
  .header-right { width: 100%; display: flex; justify-content: space-between; flex-direction: row-reverse; }
  .logo { margin-left: 0; }
  .main-content { padding: 1.5rem 4% 3rem; }
  .page-intro h1 { font-size: 1.4rem; }
  .toc-nav ol { grid-template-columns: 1fr; }
  .terms-section h2 { font-size: 0.95rem; }
  .toc-nav ol li a { padding: 8px 10px; }
}

@media (prefers-reduced-motion: reduce) { 
  *, *::before, *::after { animation-duration: 0.01ms !important; transition-duration: 0.01ms !important; }
  html { scroll-behavior: auto !important; } 
  .back-to-top:hover { transform: none; }
}