/* ═══════════════════════════════════════════════════
   OpenForensic — Website Design System
   Source: Stitch Design System "OpenForensic"
   Color mode: LIGHT  |  Primary: #005FB8
   Fonts: Inter (UI) + JetBrains Mono (data/code)
═══════════════════════════════════════════════════ */

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

/* ── Design Tokens ─────────────────────────────────── */
:root {
  /* Surface */
  --surface:                 #f8f9fa;
  --surface-dim:             #d9dadb;
  --surface-container-lowest:#ffffff;
  --surface-container-low:   #f3f4f5;
  --surface-container:       #edeeef;
  --surface-container-high:  #e7e8e9;
  --surface-container-highest:#e1e3e4;

  /* On-surface */
  --on-surface:              #191c1d;
  --on-surface-variant:      #424752;
  --inverse-surface:         #2e3132;
  --inverse-on-surface:      #f0f1f2;

  /* Outline */
  --outline:                 #727783;
  --outline-variant:         #c2c6d4;

  /* Primary */
  --primary:                 #00488d;
  --primary-container:       #005fb8;
  --on-primary:              #ffffff;
  --primary-fixed:           #d6e3ff;
  --primary-fixed-dim:       #a8c8ff;
  --surface-tint:            #005db5;

  /* Secondary */
  --secondary:               #515f74;
  --secondary-container:     #d5e3fc;
  --on-secondary:            #ffffff;

  /* Error */
  --error:                   #ba1a1a;
  --error-container:         #ffdad6;

  /* Semantic */
  --success:                 #1a7a3c;
  --success-bg:              #e6f4ec;
  --warning:                 #92600a;
  --warning-bg:              #fff3e0;

  /* Typography */
  --font-ui:                 'Inter', system-ui, sans-serif;
  --font-mono:               'JetBrains Mono', 'Fira Code', monospace;

  /* Spacing */
  --space-1:  4px;  --space-2:  8px;  --space-3: 12px;
  --space-4: 16px;  --space-5: 20px;  --space-6: 24px;
  --space-8: 32px;  --space-10:40px;  --space-12:48px;
  --space-16:64px;  --space-20:80px;

  /* Radii */
  --radius-sm: 2px; --radius: 4px; --radius-md: 6px;
  --radius-lg: 8px; --radius-xl: 12px;

  /* Shadows */
  --shadow-float: 0 4px 12px rgba(0,0,0,0.08);
}

/* ── Reset ─────────────────────────────────────────── */
*, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }
html { scroll-behavior: smooth; }
body { font-family: var(--font-ui); background: var(--surface); color: var(--on-surface); line-height: 1.5; -webkit-font-smoothing: antialiased; }
a { color: inherit; text-decoration: none; }
img { display: block; max-width: 100%; }
ul { list-style: none; }

/* ── Layout ────────────────────────────────────────── */
.container { max-width: 1280px; margin: 0 auto; padding: 0 var(--space-8); }
.section    { padding: var(--space-20) 0; }
.section-sm { padding: var(--space-12) 0; }

/* ── Navigation ────────────────────────────────────── */
.site-nav {
  position: sticky; top: 0; z-index: 100;
  background: var(--surface-container-lowest);
  border-bottom: 1px solid var(--outline-variant);
  height: 56px; display: flex; align-items: center;
}
.nav-inner {
  display: flex; align-items: center; gap: var(--space-6);
  width: 100%; max-width: 1280px; margin: 0 auto; padding: 0 var(--space-8);
}
.nav-logo {
  display: flex; align-items: center; gap: var(--space-2);
  font-size: 15px; font-weight: 700; color: var(--on-surface);
  flex-shrink: 0; letter-spacing: -0.01em;
}
.nav-logo-icon { color: var(--primary-container); }
.nav-links { display: flex; align-items: center; gap: 2px; margin-left: auto; }
.nav-link {
  padding: 6px 12px; font-size: 13px; font-weight: 500;
  color: var(--on-surface-variant); border-radius: var(--radius);
  transition: background 0.12s, color 0.12s;
}
.nav-link:hover { background: var(--surface-container); color: var(--on-surface); }
.nav-link.active { color: var(--primary-container); background: var(--primary-fixed); font-weight: 600; }
.nav-actions { display: flex; align-items: center; gap: var(--space-2); margin-left: var(--space-4); }
.nav-toggle {
  display: none;
  background: transparent;
  border: 1px solid var(--outline-variant);
  border-radius: var(--radius);
  color: var(--on-surface-variant);
  padding: 6px 8px;
  cursor: pointer;
  align-items: center;
  justify-content: center;
  transition: background 0.12s, color 0.12s;
}
.nav-toggle:hover { background: var(--surface-container); color: var(--on-surface); }

/* ── Buttons ───────────────────────────────────────── */
.btn {
  display: inline-flex; align-items: center; gap: var(--space-2);
  padding: 9px 18px; font-family: var(--font-ui); font-size: 14px; font-weight: 600;
  border-radius: var(--radius); border: 1px solid transparent;
  cursor: pointer; transition: background 0.14s, border-color 0.14s; white-space: nowrap; line-height: 1;
}
.btn-primary { background: var(--primary-container); color: #fff; border-color: var(--primary-container); }
.btn-primary:hover { background: var(--primary); border-color: var(--primary); }
.btn-ghost { background: transparent; color: var(--primary-container); border-color: var(--primary-container); }
.btn-ghost:hover { background: var(--primary-fixed); }
.btn-secondary { background: var(--surface-container-lowest); color: var(--on-surface); border-color: var(--outline-variant); }
.btn-secondary:hover { border-color: var(--outline); background: var(--surface-container-low); }
.btn-lg { padding: 13px 24px; font-size: 15px; border-radius: var(--radius-md); }
.btn-icon { padding: 8px; background: transparent; color: var(--on-surface-variant); border-color: transparent; border-radius: var(--radius); }
.btn-icon:hover { background: var(--surface-container); }

/* ── Badges ────────────────────────────────────────── */
.badge {
  display: inline-flex; align-items: center; gap: 4px;
  padding: 2px 8px; border-radius: var(--radius-sm);
  font-family: var(--font-mono); font-size: 11px; font-weight: 600;
}
.badge-blue   { background: var(--primary-fixed);  color: var(--primary); }
.badge-green  { background: var(--success-bg);      color: var(--success); }
.badge-gray   { background: var(--surface-container-high); color: var(--on-surface-variant); }
.chip {
  display: inline-flex; align-items: center; gap: 4px;
  padding: 4px 10px; border-radius: var(--radius-sm); font-size: 12px; font-weight: 500;
  border: 1px solid var(--outline-variant); color: var(--on-surface-variant); background: var(--surface-container-lowest);
}

/* ── Cards ─────────────────────────────────────────── */
.card {
  background: var(--surface-container-lowest); border: 1px solid var(--outline-variant);
  border-radius: var(--radius-lg); padding: var(--space-6);
  transition: border-color 0.14s, box-shadow 0.14s;
}
.card:hover { border-color: var(--outline); box-shadow: var(--shadow-float); }

/* ── Section Header ────────────────────────────────── */
.section-eyebrow {
  font-family: var(--font-mono); font-size: 11px; font-weight: 600;
  letter-spacing: 0.1em; text-transform: uppercase; color: var(--primary-container);
  margin-bottom: var(--space-3);
}
.section-title {
  font-size: 30px; font-weight: 700; letter-spacing: -0.02em; margin-bottom: var(--space-3);
}
.section-desc { font-size: 16px; color: var(--on-surface-variant); line-height: 1.65; }

/* ── Feature Icon ──────────────────────────────────── */
.feature-icon {
  width: 40px; height: 40px; display: flex; align-items: center; justify-content: center;
  background: var(--primary-fixed); border-radius: var(--radius-md);
  color: var(--primary); margin-bottom: var(--space-4); flex-shrink: 0;
}

/* ── Terminal ──────────────────────────────────────── */
.terminal-card { background: #1a1d23; border: 1px solid #3a3f4a; border-radius: var(--radius-lg); overflow: hidden; }
.terminal-header {
  display: flex; align-items: center; gap: var(--space-2);
  padding: 10px 16px; border-bottom: 1px solid #3a3f4a; background: #161920;
}
.terminal-dots { display: flex; gap: 5px; }
.terminal-dot { width: 10px; height: 10px; border-radius: 50%; }
.dot-red { background: #ff5f56; } .dot-yellow { background: #ffbd2e; } .dot-green { background: #27c93f; }
.terminal-title { font-family: var(--font-mono); font-size: 11px; color: #8a8fa3; margin-left: 4px; }
.terminal-body { padding: 16px 20px; }
.terminal-line {
  display: flex; align-items: flex-start; gap: 12px;
  font-family: var(--font-mono); font-size: 12.5px; line-height: 1.65; color: #c5ccd8; margin-bottom: 2px;
}
.t-prompt { color: #5a9fd4; font-weight: 600; }
.t-cmd    { color: #a8d0f5; }
.t-out    { color: #8aaf7e; }
.t-hash   { color: #e2c07b; word-break: break-all; }
.t-ok     { color: #27c93f; font-weight: 700; }
.t-dim    { color: #6a7080; }

/* ── Stats Band ────────────────────────────────────── */
.stats-band { background: var(--on-surface); padding: var(--space-12) 0; }
.stats-grid {
  display: grid; grid-template-columns: repeat(4, 1fr);
  gap: 1px; background: #3a3f4a; border: 1px solid #3a3f4a;
  border-radius: var(--radius-lg); overflow: hidden;
}
.stat-item { background: var(--on-surface); padding: var(--space-6); text-align: center; }
.stat-value { font-family: var(--font-mono); font-size: 17px; font-weight: 700; color: var(--primary-fixed-dim); margin-bottom: 4px; }
.stat-label { font-size: 12px; color: #8a8fa3; font-weight: 500; }

/* ── FAQ ───────────────────────────────────────────── */
.faq-item { border-bottom: 1px solid var(--outline-variant); }
.faq-question {
  display: flex; align-items: center; justify-content: space-between;
  padding: 20px 0; cursor: pointer; font-size: 15px; font-weight: 600;
  color: var(--on-surface); user-select: none; gap: var(--space-4);
  transition: color 0.14s;
}
.faq-question:hover { color: var(--primary-container); }
.faq-chevron {
  flex-shrink: 0; width: 20px; height: 20px;
  display: flex; align-items: center; justify-content: center;
  color: var(--outline); transition: transform 0.22s;
}
.faq-item.open .faq-chevron { transform: rotate(180deg); color: var(--primary-container); }
.faq-answer { display: none; padding-bottom: 20px; color: var(--on-surface-variant); font-size: 14px; line-height: 1.75; }
.faq-item.open .faq-answer { display: block; }
.faq-answer code { font-family: var(--font-mono); font-size: 12px; background: var(--surface-container); padding: 1px 5px; border-radius: 3px; color: var(--primary); }
.faq-answer pre { background: var(--inverse-surface); color: var(--inverse-on-surface); border-radius: var(--radius-md); padding: var(--space-4) var(--space-5); font-family: var(--font-mono); font-size: 12px; overflow-x: auto; margin: var(--space-3) 0; line-height: 1.6; }

/* ── Help Layout ───────────────────────────────────── */
.help-layout { display: grid; grid-template-columns: 240px 1fr; gap: var(--space-8); align-items: start; }
.help-sidebar { position: sticky; top: 72px; background: var(--surface-container-lowest); border: 1px solid var(--outline-variant); border-radius: var(--radius-lg); overflow: hidden; }
.help-sidebar-header { padding: 10px 16px; background: var(--surface-container); border-bottom: 1px solid var(--outline-variant); font-size: 11px; font-weight: 700; letter-spacing: 0.08em; text-transform: uppercase; color: var(--on-surface-variant); }
.help-nav-item {
  display: flex; align-items: center; gap: var(--space-2);
  padding: 9px 16px; font-size: 13px; font-weight: 500;
  color: var(--on-surface-variant); border-left: 2px solid transparent;
  cursor: pointer; transition: all 0.14s;
}
.help-nav-item:hover { color: var(--on-surface); background: var(--surface-container-low); }
.help-nav-item.active { color: var(--primary-container); background: var(--primary-fixed); border-left-color: var(--primary-container); font-weight: 600; }
.help-article { display: none; }
.help-article.active { display: block; }
.help-article h2 { font-size: 24px; font-weight: 700; margin-bottom: 16px; padding-bottom: 12px; border-bottom: 1px solid var(--outline-variant); }
.help-article h3 { font-size: 17px; font-weight: 600; margin: 24px 0 12px; }
.help-article p  { font-size: 14px; color: var(--on-surface-variant); line-height: 1.75; margin-bottom: 12px; }
.help-article ul { padding-left: 20px; margin-bottom: 12px; }
.help-article li { font-size: 14px; color: var(--on-surface-variant); line-height: 1.7; margin-bottom: 4px; list-style: disc; }
.help-article code { font-family: var(--font-mono); font-size: 12px; background: var(--surface-container); padding: 1px 5px; border-radius: 3px; color: var(--primary); }
.help-article pre { background: var(--inverse-surface); color: var(--inverse-on-surface); border-radius: var(--radius-md); padding: 16px 20px; font-family: var(--font-mono); font-size: 12.5px; overflow-x: auto; margin: 16px 0; line-height: 1.6; }
.callout { border-left: 3px solid var(--primary-container); background: var(--primary-fixed); padding: 12px 16px; border-radius: 0 var(--radius-md) var(--radius-md) 0; margin: 16px 0; font-size: 13px; color: var(--primary); }
.callout.warn { border-left-color: var(--warning); background: var(--warning-bg); color: var(--warning); }
.callout.danger { border-left-color: var(--error); background: var(--error-container); color: var(--error); }
.steps { counter-reset: step; margin: 16px 0; }
.step { counter-increment: step; display: flex; gap: 16px; margin-bottom: 20px; }
.step-num { flex-shrink: 0; width: 28px; height: 28px; border-radius: 50%; background: var(--primary-container); color: #fff; font-size: 13px; font-weight: 700; display: flex; align-items: center; justify-content: center; }
.step-content { flex: 1; padding-top: 2px; }

/* ── Page Hero ─────────────────────────────────────── */
.page-hero { background: var(--surface-container-low); border-bottom: 1px solid var(--outline-variant); padding: 48px 0; }
.breadcrumb { display: flex; align-items: center; gap: 8px; font-size: 13px; color: var(--on-surface-variant); margin-bottom: 16px; }
.breadcrumb-sep { color: var(--outline); }
.breadcrumb-current { color: var(--on-surface); font-weight: 600; }

/* ── Footer ────────────────────────────────────────── */
.site-footer { background: var(--surface-container-lowest); border-top: 1px solid var(--outline-variant); padding: 48px 0 24px; }
.footer-grid { display: grid; grid-template-columns: 2fr 1fr 1fr 1fr; gap: 32px; margin-bottom: 40px; }
.footer-brand p { font-size: 14px; color: var(--on-surface-variant); margin-top: 12px; max-width: 280px; line-height: 1.6; }
.footer-col h4 { font-size: 11px; font-weight: 700; letter-spacing: 0.08em; text-transform: uppercase; color: var(--on-surface-variant); margin-bottom: 16px; }
.footer-col li { margin-bottom: 8px; }
.footer-col a { font-size: 14px; color: var(--on-surface-variant); transition: color 0.14s; }
.footer-col a:hover { color: var(--primary-container); }
.footer-bottom { display: flex; align-items: center; justify-content: space-between; padding-top: 24px; border-top: 1px solid var(--outline-variant); font-size: 12px; color: var(--outline); }

/* ── Divider ───────────────────────────────────────── */
.divider { border: none; border-top: 1px solid var(--outline-variant); }

/* ── Tables ────────────────────────────────────────── */
.data-table { width: 100%; border-collapse: collapse; font-size: 14px; }
.data-table th { background: var(--surface-container-low); color: var(--on-surface-variant); font-size: 11px; font-weight: 700; letter-spacing: 0.05em; text-transform: uppercase; text-align: left; padding: 10px 16px; border-bottom: 1px solid var(--outline-variant); }
.data-table td { padding: 10px 16px; border-bottom: 1px solid var(--surface-container-high); vertical-align: top; }
.data-table tr:hover td { background: var(--surface-container-low); }
.mono { font-family: var(--font-mono); font-size: 12px; }

/* ── Responsive Layout Utility Classes ─────────────── */
.hero-title {
  font-size: clamp(32px, 5.5vw, 48px);
  font-weight: 700;
  letter-spacing: -0.03em;
  line-height: 1.12;
  margin-bottom: 24px;
}
.section-title {
  font-size: clamp(24px, 4vw, 32px);
  font-weight: 700;
  letter-spacing: -0.02em;
  margin-bottom: var(--space-3);
}
.grid-3 {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 20px;
}
.grid-2 {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 64px;
  align-items: center;
}
.modes-grid {
  display: grid;
  grid-template-columns: 1fr auto 1fr;
  gap: 24px;
  align-items: start;
}
.modes-arrow {
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  gap: 12px;
  padding-top: 40px;
}
.hero-actions {
  display: flex;
  gap: 12px;
  flex-wrap: wrap;
  align-items: center;
  margin-bottom: 24px;
}
.hero-chips {
  display: flex;
  gap: 10px;
  flex-wrap: wrap;
  margin-bottom: 48px;
}
.table-responsive {
  width: 100%;
  overflow-x: auto;
  -webkit-overflow-scrolling: touch;
  margin: var(--space-4) 0;
}

/* ── Responsive Breakpoints ────────────────────────── */
@media (max-width: 1024px) {
  .nav-inner { padding: 0 var(--space-6); }
  .grid-3 { grid-template-columns: repeat(2, 1fr); }
  .grid-2 { gap: 36px; }
  .footer-grid { grid-template-columns: 1fr 1fr; gap: 24px; }
  .stats-grid  { grid-template-columns: repeat(2, 1fr); }
  .help-layout { grid-template-columns: 1fr; gap: 24px; }
  .help-sidebar {
    position: static;
    display: flex;
    flex-direction: row;
    overflow-x: auto;
    white-space: nowrap;
    border-radius: var(--radius-lg);
    padding: var(--space-2);
    gap: var(--space-1);
    -webkit-overflow-scrolling: touch;
  }
  .help-sidebar-header { display: none; }
  .help-nav-item {
    border-left: none;
    border-bottom: 2px solid transparent;
    border-radius: var(--radius);
    padding: 8px 14px;
    flex-shrink: 0;
  }
  .help-nav-item.active {
    border-bottom-color: var(--primary-container);
  }
}

@media (max-width: 768px) {
  .container { padding: 0 16px; }
  .nav-inner { padding: 0 16px; position: relative; }
  .section { padding: 48px 0; }
  .hero-section { padding: 48px 0 36px !important; }
  .page-hero { padding: 32px 0; }

  /* Navigation Mobile Drawer */
  .nav-toggle { display: inline-flex; }
  .nav-links {
    display: none;
    position: absolute;
    top: 56px;
    left: 0;
    right: 0;
    background: var(--surface-container-lowest);
    border-bottom: 1px solid var(--outline-variant);
    padding: var(--space-4) var(--space-6);
    flex-direction: column;
    align-items: stretch;
    gap: var(--space-2);
    box-shadow: 0 12px 24px rgba(0, 0, 0, 0.1);
    z-index: 200;
  }
  .nav-links.nav-open { display: flex; }
  .nav-link {
    padding: 10px 14px;
    font-size: 14px;
    width: 100%;
  }

  /* Grid Stack on Mobile */
  .grid-3 { grid-template-columns: 1fr; gap: 16px; }
  .grid-2 { grid-template-columns: 1fr; gap: 24px; }
  .modes-grid { grid-template-columns: 1fr; gap: 16px; }
  .modes-arrow {
    flex-direction: row;
    padding-top: 0;
    margin: 8px 0;
  }
  .modes-arrow svg {
    transform: rotate(90deg);
  }

  /* Terminal Card Responsive */
  .terminal-body {
    padding: 12px 14px;
    overflow-x: auto;
  }
  .terminal-line {
    font-size: 11.5px;
    flex-wrap: wrap;
    gap: 6px;
  }
  .t-cmd, .t-hash, .t-out {
    word-break: break-word;
  }

  /* Buttons & Action Bars */
  .hero-actions {
    flex-direction: column;
    align-items: stretch;
  }
  .hero-actions .btn {
    justify-content: center;
    width: 100%;
  }

  /* FAQ & Help responsiveness */
  .faq-question {
    font-size: 14px;
    padding: 16px 0;
  }
  .faq-answer pre, .help-article pre {
    padding: 12px 14px;
    font-size: 11.5px;
    overflow-x: auto;
  }
  .help-article h2 { font-size: 20px; }
  .help-article h3 { font-size: 16px; }

  /* Footer & Stats */
  .footer-grid { grid-template-columns: 1fr; gap: 24px; }
  .footer-bottom {
    flex-direction: column;
    gap: 12px;
    text-align: center;
  }
  .stats-grid { grid-template-columns: repeat(2, 1fr); }
}

@media (max-width: 480px) {
  .nav-actions .badge { display: none; }
  .nav-actions .btn-primary {
    padding: 7px 12px;
    font-size: 13px;
  }
  .hero-title { font-size: 28px !important; }
  .section-title { font-size: 22px !important; }
  .stat-value { font-size: 14px; }
  .stat-item { padding: var(--space-4); }
  .help-sidebar { gap: 4px; padding: 6px; }
  .help-nav-item { padding: 6px 10px; font-size: 12px; }
}

/* ── Animations ────────────────────────────────────── */
@keyframes fadeUp { from { opacity:0; transform:translateY(14px); } to { opacity:1; transform:none; } }
.animate-up { animation: fadeUp 0.45s ease both; }
.delay-1 { animation-delay: 0.1s; }
.delay-2 { animation-delay: 0.2s; }
.delay-3 { animation-delay: 0.3s; }
@keyframes pulse { 0%,100%{opacity:1}50%{opacity:0.4} }
.pulse { animation: pulse 1.8s ease-in-out infinite; }