/* Sentinel - Modern Minimal Cybersecurity Design System */

:root {
  --bg-primary: #ffffff;
  --bg-secondary: #f8fafc;
  --bg-tertiary: #f1f5f9;
  --bg-card: #ffffff;
  --border-color: #e2e8f0;
  --border-focus: #3b82f6;

  --text-primary: #0f172a;
  --text-secondary: #475569;
  --text-muted: #64748b;
  --text-light: #94a3b8;

  --accent-blue: #0284c7;
  --accent-blue-hover: #0369a1;
  --accent-navy: #0f172a;
  --accent-navy-hover: #1e293b;

  --risk-low: #059669;
  --risk-low-bg: #ecfdf5;
  --risk-medium: #d97706;
  --risk-medium-bg: #fffbeb;
  --risk-high: #dc2626;
  --risk-high-bg: #fef2f2;
  --risk-critical: #991b1b;
  --risk-critical-bg: #fee2e2;

  --font-sans: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, Helvetica, Arial, sans-serif;
  --font-mono: 'JetBrains Mono', 'Fira Code', Consolas, Monaco, monospace;

  --container-max: 1180px;
  --shadow-sm: 0 1px 2px 0 rgba(0, 0, 0, 0.05);
  --shadow-md: 0 4px 6px -1px rgba(0, 0, 0, 0.07), 0 2px 4px -2px rgba(0, 0, 0, 0.05);
  --shadow-lg: 0 10px 15px -3px rgba(0, 0, 0, 0.08), 0 4px 6px -4px rgba(0, 0, 0, 0.04);
}

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

html {
  font-family: var(--font-sans);
  color: var(--text-primary);
  background-color: var(--bg-primary);
  scroll-behavior: smooth;
  line-height: 1.6;
  -webkit-font-smoothing: antialiased;
}

body {
  min-height: 100vh;
  display: flex;
  flex-direction: column;
}

a {
  color: var(--accent-blue);
  text-decoration: none;
  transition: color 0.15s ease;
}

a:hover {
  color: var(--accent-blue-hover);
}

/* Container */
.container {
  width: 100%;
  max-width: var(--container-max);
  margin-left: auto;
  margin-right: auto;
  padding-left: 1.5rem;
  padding-right: 1.5rem;
}

/* Header & Navigation */
.site-header {
  position: sticky;
  top: 0;
  z-index: 50;
  background-color: rgba(255, 255, 255, 0.95);
  backdrop-filter: blur(8px);
  border-bottom: 1px solid var(--border-color);
}

.nav-container {
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: 4.25rem;
}

.brand {
  display: flex;
  align-items: center;
  gap: 0.65rem;
  font-weight: 700;
  font-size: 1.25rem;
  color: var(--accent-navy);
  letter-spacing: -0.02em;
}

.brand-icon {
  width: 28px;
  height: 28px;
  color: var(--accent-blue);
}

.nav-links {
  display: flex;
  align-items: center;
  gap: 1.75rem;
  list-style: none;
}

.nav-link {
  font-size: 0.925rem;
  font-weight: 500;
  color: var(--text-secondary);
}

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

.nav-actions {
  display: flex;
  align-items: center;
  gap: 0.85rem;
}

/* Mobile Toggle */
.mobile-toggle {
  display: none;
  background: none;
  border: none;
  cursor: pointer;
  padding: 0.5rem;
  color: var(--text-primary);
}

/* Buttons */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 0.5rem;
  font-size: 0.925rem;
  font-weight: 600;
  padding: 0.65rem 1.25rem;
  border-radius: 6px;
  cursor: pointer;
  transition: all 0.15s ease-in-out;
  border: 1px solid transparent;
  line-height: 1.25;
}

.btn-primary {
  background-color: var(--accent-navy);
  color: #ffffff;
  border-color: var(--accent-navy);
}

.btn-primary:hover {
  background-color: var(--accent-navy-hover);
  color: #ffffff;
  border-color: var(--accent-navy-hover);
}

.btn-secondary {
  background-color: var(--bg-primary);
  color: var(--text-primary);
  border-color: var(--border-color);
}

.btn-secondary:hover {
  background-color: var(--bg-secondary);
  border-color: #cbd5e1;
  color: var(--text-primary);
}

.btn-blue {
  background-color: var(--accent-blue);
  color: #ffffff;
  border-color: var(--accent-blue);
}

.btn-blue:hover {
  background-color: var(--accent-blue-hover);
  color: #ffffff;
  border-color: var(--accent-blue-hover);
}

.btn-sm {
  padding: 0.45rem 0.85rem;
  font-size: 0.85rem;
}

.btn-lg {
  padding: 0.85rem 1.65rem;
  font-size: 1rem;
}

.btn-disabled {
  background-color: #f1f5f9;
  color: #64748b;
  border-color: #cbd5e1;
  cursor: default;
  box-shadow: none;
}

.btn-disabled:hover {
  background-color: #f1f5f9;
  color: #64748b;
  border-color: #cbd5e1;
  transform: none;
}

.spin-icon {
  animation: spin 1s linear infinite;
}

@keyframes spin {
  from {
    transform: rotate(0deg);
  }
  to {
    transform: rotate(360deg);
  }
}

/* Hero Section */
.hero-section {
  padding: 5rem 0 3.5rem;
  background: linear-gradient(180deg, #ffffff 0%, var(--bg-secondary) 100%);
  border-bottom: 1px solid var(--border-color);
}

.hero-content {
  text-align: center;
  max-width: 820px;
  margin: 0 auto 3rem;
}

.hero-badge {
  display: inline-flex;
  align-items: center;
  gap: 0.5rem;
  padding: 0.35rem 0.85rem;
  background-color: #e0f2fe;
  color: var(--accent-blue-hover);
  border-radius: 9999px;
  font-size: 0.825rem;
  font-weight: 600;
  margin-bottom: 1.5rem;
  letter-spacing: 0.01em;
}

.hero-title {
  font-size: clamp(2.4rem, 5vw, 3.4rem);
  font-weight: 800;
  line-height: 1.15;
  letter-spacing: -0.035em;
  color: var(--accent-navy);
  margin-bottom: 1.25rem;
}

.hero-subtitle {
  font-size: 1.175rem;
  color: var(--text-secondary);
  line-height: 1.6;
  margin-bottom: 2rem;
  font-weight: 400;
}

.hero-buttons {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 1rem;
  flex-wrap: wrap;
}

/* Dashboard Mockup / Preview */
.preview-container {
  max-width: 980px;
  margin: 0 auto;
  background-color: #0c1422;
  border-radius: 12px;
  border: 1px solid #1e293b;
  overflow: hidden;
  box-shadow: 0 20px 35px -10px rgba(15, 23, 42, 0.25);
}

.preview-window-bar {
  background-color: #080d18;
  padding: 0.75rem 1rem;
  display: flex;
  align-items: center;
  gap: 0.5rem;
  border-bottom: 1px solid #1e2d42;
}

.window-dot {
  width: 10px;
  height: 10px;
  border-radius: 50%;
  display: inline-block;
}

.dot-red { background-color: #ef4444; }
.dot-yellow { background-color: #f59e0b; }
.dot-green { background-color: #10b981; }

.preview-window-title {
  color: #94a3b8;
  font-size: 0.8rem;
  font-family: var(--font-mono);
  margin-left: 0.5rem;
}

.preview-inner {
  padding: 1.75rem;
  color: #e2e8f0;
}

.preview-hero-banner {
  background: linear-gradient(110deg, rgba(18, 36, 59, 0.9), rgba(14, 27, 44, 0.6));
  border: 1px solid rgba(86, 183, 255, 0.25);
  border-radius: 10px;
  padding: 1.25rem 1.5rem;
  margin-bottom: 1.5rem;
}

.preview-eyebrow {
  color: #42dfd0;
  font-size: 0.75rem;
  font-weight: 700;
  letter-spacing: 0.1em;
  text-transform: uppercase;
  margin-bottom: 0.35rem;
}

.preview-heading {
  font-size: 1.4rem;
  font-weight: 700;
  color: #ffffff;
}

.preview-metrics-grid {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 1rem;
  margin-bottom: 1.5rem;
}

.preview-metric-card {
  background: #101b2b;
  border: 1px solid #1e314b;
  border-radius: 8px;
  padding: 1rem;
}

.preview-metric-label {
  font-size: 0.785rem;
  color: #94a3b8;
  margin-bottom: 0.35rem;
}

.preview-metric-value {
  font-size: 1.5rem;
  font-weight: 700;
  color: #f8fafc;
}

.preview-table-wrapper {
  background: #101b2b;
  border: 1px solid #1e314b;
  border-radius: 8px;
  overflow-x: auto;
}

.preview-table {
  width: 100%;
  border-collapse: collapse;
  text-align: left;
  font-size: 0.825rem;
}

.preview-table th {
  padding: 0.75rem 1rem;
  background: #0d1624;
  color: #94a3b8;
  font-weight: 600;
  border-bottom: 1px solid #1e314b;
}

.preview-table td {
  padding: 0.75rem 1rem;
  border-bottom: 1px solid #18263a;
  color: #e2e8f0;
}

.risk-badge {
  display: inline-block;
  padding: 0.2rem 0.55rem;
  border-radius: 4px;
  font-size: 0.75rem;
  font-weight: 600;
}

.risk-critical-tag { background: rgba(239, 68, 68, 0.2); color: #f87171; border: 1px solid rgba(239, 68, 68, 0.4); }
.risk-high-tag { background: rgba(249, 115, 22, 0.2); color: #fb923c; border: 1px solid rgba(249, 115, 22, 0.4); }
.risk-medium-tag { background: rgba(245, 158, 11, 0.2); color: #fcd34d; border: 1px solid rgba(245, 158, 11, 0.4); }
.risk-low-tag { background: rgba(16, 185, 129, 0.2); color: #6ee7b7; border: 1px solid rgba(16, 185, 129, 0.4); }

/* Section Styling */
.section {
  padding: 4.5rem 0;
}

.section-alt {
  background-color: var(--bg-secondary);
  border-top: 1px solid var(--border-color);
  border-bottom: 1px solid var(--border-color);
}

.section-header {
  text-align: center;
  max-width: 680px;
  margin: 0 auto 3.25rem;
}

.section-tag {
  color: var(--accent-blue);
  font-size: 0.825rem;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.08em;
  margin-bottom: 0.5rem;
  display: block;
}

.section-title {
  font-size: 2.15rem;
  font-weight: 800;
  color: var(--accent-navy);
  letter-spacing: -0.025em;
  line-height: 1.25;
  margin-bottom: 0.85rem;
}

.section-desc {
  font-size: 1.05rem;
  color: var(--text-secondary);
  line-height: 1.6;
}

/* Feature Grid */
.features-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(260px, 1fr));
  gap: 1.5rem;
}

.feature-card {
  background: var(--bg-card);
  border: 1px solid var(--border-color);
  border-radius: 8px;
  padding: 1.75rem;
  transition: border-color 0.15s ease, box-shadow 0.15s ease;
}

.feature-card:hover {
  border-color: #cbd5e1;
  box-shadow: var(--shadow-sm);
}

.feature-icon-box {
  width: 42px;
  height: 42px;
  background-color: #f0f9ff;
  color: var(--accent-blue);
  border-radius: 6px;
  display: flex;
  align-items: center;
  justify-content: center;
  margin-bottom: 1.15rem;
}

.feature-title {
  font-size: 1.1rem;
  font-weight: 700;
  color: var(--accent-navy);
  margin-bottom: 0.5rem;
}

.feature-text {
  font-size: 0.925rem;
  color: var(--text-secondary);
  line-height: 1.55;
}

/* Workflow Steps */
.workflow-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 1.5rem;
}

.step-card {
  background: var(--bg-card);
  border: 1px solid var(--border-color);
  border-radius: 8px;
  padding: 1.75rem;
  position: relative;
}

.step-num {
  display: inline-block;
  font-size: 0.8rem;
  font-weight: 700;
  color: var(--accent-blue);
  background-color: #e0f2fe;
  padding: 0.2rem 0.6rem;
  border-radius: 4px;
  margin-bottom: 0.85rem;
}

.step-title {
  font-size: 1.05rem;
  font-weight: 700;
  color: var(--accent-navy);
  margin-bottom: 0.5rem;
}

.step-desc {
  font-size: 0.9rem;
  color: var(--text-secondary);
  line-height: 1.55;
}

.workflow-notice {
  margin-top: 2rem;
  padding: 1rem 1.25rem;
  background-color: var(--bg-tertiary);
  border-left: 3px solid var(--accent-blue);
  border-radius: 4px;
  font-size: 0.875rem;
  color: var(--text-secondary);
}

/* Benefits Grid */
.benefits-grid {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 1.5rem;
}

.benefit-item {
  display: flex;
  gap: 1rem;
  background: var(--bg-card);
  border: 1px solid var(--border-color);
  border-radius: 8px;
  padding: 1.35rem;
}

.benefit-check {
  width: 22px;
  height: 22px;
  color: var(--risk-low);
  flex-shrink: 0;
  margin-top: 0.15rem;
}

.benefit-title {
  font-size: 1rem;
  font-weight: 700;
  color: var(--accent-navy);
  margin-bottom: 0.25rem;
}

.benefit-desc {
  font-size: 0.9rem;
  color: var(--text-secondary);
  line-height: 1.5;
}

/* Interactive Playground */
.playground-box {
  background: var(--bg-card);
  border: 1px solid var(--border-color);
  border-radius: 8px;
  box-shadow: var(--shadow-sm);
  padding: 1.75rem;
}

.preset-buttons {
  display: flex;
  gap: 0.5rem;
  flex-wrap: wrap;
  margin-bottom: 1.25rem;
}

.preset-btn {
  font-size: 0.825rem;
  padding: 0.35rem 0.75rem;
  border-radius: 4px;
  background: var(--bg-secondary);
  border: 1px solid var(--border-color);
  cursor: pointer;
  color: var(--text-secondary);
  font-weight: 500;
  transition: all 0.15s ease;
}

.preset-btn:hover {
  background: #e2e8f0;
  color: var(--text-primary);
}

.simulator-textarea {
  width: 100%;
  height: 130px;
  padding: 0.75rem;
  border: 1px solid var(--border-color);
  border-radius: 6px;
  font-family: var(--font-mono);
  font-size: 0.875rem;
  color: var(--text-primary);
  margin-bottom: 1rem;
  resize: vertical;
}

.simulator-textarea:focus {
  outline: none;
  border-color: var(--border-focus);
}

.sim-output {
  margin-top: 1.25rem;
  padding: 1rem;
  background: var(--bg-secondary);
  border-radius: 6px;
  border: 1px solid var(--border-color);
}

/* Download Section */
.download-card {
  background: var(--bg-card);
  border: 1px solid var(--border-color);
  border-radius: 10px;
  padding: 2.25rem;
  box-shadow: var(--shadow-sm);
}

.download-header {
  display: flex;
  justify-content: space-between;
  align-items: flex-start;
  flex-wrap: wrap;
  gap: 1.5rem;
  margin-bottom: 2rem;
  padding-bottom: 1.75rem;
  border-bottom: 1px solid var(--border-color);
}

.download-meta-grid {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 1.25rem;
  margin-bottom: 2rem;
}

.meta-box {
  background: var(--bg-secondary);
  padding: 1rem;
  border-radius: 6px;
  border: 1px solid var(--border-color);
}

.meta-title {
  font-size: 0.775rem;
  color: var(--text-muted);
  text-transform: uppercase;
  font-weight: 600;
  margin-bottom: 0.25rem;
}

.meta-value {
  font-size: 1rem;
  font-weight: 700;
  color: var(--accent-navy);
}

.checksum-box {
  background: #0f172a;
  color: #e2e8f0;
  padding: 1rem 1.25rem;
  border-radius: 6px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 1rem;
  font-family: var(--font-mono);
  font-size: 0.85rem;
  margin-bottom: 2rem;
  overflow-x: auto;
}

.checksum-code {
  word-break: break-all;
  color: #38bdf8;
}

.copy-btn {
  background: #1e293b;
  color: #f8fafc;
  border: 1px solid #334155;
  padding: 0.4rem 0.75rem;
  border-radius: 4px;
  font-size: 0.8rem;
  cursor: pointer;
  white-space: nowrap;
  font-family: var(--font-sans);
}

.copy-btn:hover {
  background: #334155;
}

.requirements-list {
  list-style: none;
  font-size: 0.925rem;
  color: var(--text-secondary);
  margin-top: 1rem;
}

.requirements-list li {
  padding: 0.35rem 0;
  display: flex;
  align-items: center;
  gap: 0.5rem;
}

/* Tabs & Guides */
.guide-tabs {
  display: flex;
  gap: 0.5rem;
  border-bottom: 1px solid var(--border-color);
  margin-bottom: 1.75rem;
  overflow-x: auto;
}

.guide-tab-btn {
  padding: 0.65rem 1.15rem;
  border: none;
  background: none;
  font-size: 0.95rem;
  font-weight: 600;
  color: var(--text-secondary);
  cursor: pointer;
  border-bottom: 2px solid transparent;
  transition: all 0.15s ease;
  white-space: nowrap;
}

.guide-tab-btn.active {
  color: var(--accent-blue);
  border-bottom-color: var(--accent-blue);
}

.guide-pane {
  display: none;
}

.guide-pane.active {
  display: block;
}

.steps-list {
  list-style: none;
  counter-reset: step-counter;
}

.step-list-item {
  counter-increment: step-counter;
  position: relative;
  padding-left: 3rem;
  margin-bottom: 1.75rem;
}

.step-list-item::before {
  content: counter(step-counter);
  position: absolute;
  left: 0;
  top: 0;
  width: 2rem;
  height: 2rem;
  background-color: #e0f2fe;
  color: var(--accent-blue-hover);
  border-radius: 50%;
  font-weight: 700;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 0.85rem;
}

.step-list-title {
  font-size: 1.05rem;
  font-weight: 700;
  color: var(--accent-navy);
  margin-bottom: 0.35rem;
}

.step-list-body {
  font-size: 0.925rem;
  color: var(--text-secondary);
  line-height: 1.6;
}

/* FAQ Accordion */
.faq-grid {
  max-width: 820px;
  margin: 0 auto;
}

.faq-item {
  border: 1px solid var(--border-color);
  border-radius: 6px;
  margin-bottom: 0.75rem;
  background: var(--bg-card);
  overflow: hidden;
}

.faq-question {
  width: 100%;
  text-align: left;
  padding: 1.15rem 1.35rem;
  background: none;
  border: none;
  font-size: 1rem;
  font-weight: 600;
  color: var(--accent-navy);
  cursor: pointer;
  display: flex;
  justify-content: space-between;
  align-items: center;
  gap: 1rem;
}

.faq-icon {
  transition: transform 0.2s ease;
}

.faq-item.open .faq-icon {
  transform: rotate(180deg);
}

.faq-answer {
  display: none;
  padding: 0 1.35rem 1.25rem;
  color: var(--text-secondary);
  font-size: 0.925rem;
  line-height: 1.65;
}

.faq-item.open .faq-answer {
  display: block;
}

/* Footer */
.site-footer {
  background-color: var(--bg-secondary);
  border-top: 1px solid var(--border-color);
  padding: 3.5rem 0 2rem;
  margin-top: auto;
}

.footer-grid {
  display: grid;
  grid-template-columns: 2fr 1fr 1fr 1fr;
  gap: 2.5rem;
  margin-bottom: 3rem;
}

.footer-brand-desc {
  font-size: 0.9rem;
  color: var(--text-secondary);
  max-width: 320px;
  margin-top: 0.75rem;
}

.footer-col-title {
  font-size: 0.85rem;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.05em;
  color: var(--accent-navy);
  margin-bottom: 1rem;
}

.footer-links {
  list-style: none;
}

.footer-links li {
  margin-bottom: 0.6rem;
}

.footer-links a {
  font-size: 0.9rem;
  color: var(--text-secondary);
}

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

.footer-bottom {
  padding-top: 1.75rem;
  border-top: 1px solid var(--border-color);
  display: flex;
  justify-content: space-between;
  align-items: center;
  flex-wrap: wrap;
  gap: 1rem;
  font-size: 0.85rem;
  color: var(--text-muted);
}

/* Responsive */
@media (max-width: 900px) {
  .workflow-grid {
    grid-template-columns: 1fr;
  }
  .preview-metrics-grid {
    grid-template-columns: repeat(2, 1fr);
  }
  .download-meta-grid {
    grid-template-columns: repeat(2, 1fr);
  }
  .footer-grid {
    grid-template-columns: 1fr 1fr;
  }
}

@media (max-width: 640px) {
  .nav-links, .nav-actions {
    display: none;
  }
  .mobile-toggle {
    display: block;
  }
  .nav-menu-open .nav-links {
    display: flex;
    flex-direction: column;
    position: absolute;
    top: 4.25rem;
    left: 0;
    right: 0;
    background: #ffffff;
    border-bottom: 1px solid var(--border-color);
    padding: 1.5rem;
    gap: 1rem;
    box-shadow: var(--shadow-md);
  }
  .benefits-grid {
    grid-template-columns: 1fr;
  }
  .download-meta-grid {
    grid-template-columns: 1fr;
  }
  .footer-grid {
    grid-template-columns: 1fr;
  }
  .hero-title {
    font-size: 2.15rem;
  }
}