/* ==========================================================================
   DiskView — https://mydiskviewer.com
   Native macOS Disk Space Visualizer Design System
   ========================================================================== */

:root {
  /* Color Palette inspired by macOS Sonoma/Sequoia & Apple Design */
  --bg-primary: #0a0c10;
  --bg-secondary: #12161f;
  --bg-tertiary: #1b202c;
  --bg-card: rgba(22, 27, 38, 0.75);
  --bg-card-hover: rgba(30, 37, 51, 0.85);
  --bg-glass: rgba(18, 22, 31, 0.7);
  --border-color: rgba(255, 255, 255, 0.08);
  --border-hover: rgba(255, 255, 255, 0.18);
  --border-accent: rgba(0, 122, 255, 0.4);

  /* Typography */
  --text-primary: #f5f5f7;
  --text-secondary: #a1a1a6;
  --text-tertiary: #6e6e73;
  --text-accent: #2997ff;

  /* App File Category Colors (Matches FileCategory.swift) */
  --cat-image: #f26659;
  --cat-video: #9966d9;
  --cat-audio: #33b3a6;
  --cat-application: #408ce6;
  --cat-archive: #f2bf33;
  --cat-sourcecode: #4dbf66;
  --cat-document: #e68c40;
  --cat-system: #808c99;
  --cat-other: #b3b8bf;

  /* Accent & Gradients */
  --accent-blue: #0071e3;
  --accent-glow: #2997ff;
  --gradient-scan: linear-gradient(135deg, #0071e3 0%, #9966d9 50%, #f26659 100%);
  --gradient-glow: radial-gradient(circle at 50% -20%, rgba(41, 151, 255, 0.15), transparent 70%);
  --gradient-card: linear-gradient(180deg, rgba(255, 255, 255, 0.04) 0%, rgba(255, 255, 255, 0.01) 100%);

  /* Spacing & Radii */
  --radius-sm: 8px;
  --radius-md: 14px;
  --radius-lg: 20px;
  --radius-xl: 28px;
  --radius-pill: 9999px;

  /* Transitions & Shadows */
  --shadow-subtle: 0 4px 20px rgba(0, 0, 0, 0.35);
  --shadow-window: 0 30px 80px rgba(0, 0, 0, 0.6), 0 0 0 1px rgba(255, 255, 255, 0.1);
  --shadow-glow: 0 0 30px rgba(41, 151, 255, 0.35);
  --transition-fast: 0.2s cubic-bezier(0.16, 1, 0.3, 1);
  --transition-smooth: 0.35s cubic-bezier(0.16, 1, 0.3, 1);

  /* Fonts */
  --font-sans: -apple-system, BlinkMacSystemFont, "SF Pro Display", "SF Pro Text", "Segoe UI", Roboto, Helvetica, Arial, sans-serif;
  --font-mono: "SF Mono", Monaco, Menlo, Consolas, "Liberation Mono", "Courier New", monospace;
}

/* Light Mode Overrides (when user explicitly prefers or requests light) */
@media (prefers-color-scheme: light) {
  :root[data-theme="light"] {
    --bg-primary: #f5f5f7;
    --bg-secondary: #ffffff;
    --bg-tertiary: #e5e5ea;
    --bg-card: rgba(255, 255, 255, 0.85);
    --bg-card-hover: rgba(255, 255, 255, 0.95);
    --bg-glass: rgba(255, 255, 255, 0.8);
    --border-color: rgba(0, 0, 0, 0.08);
    --border-hover: rgba(0, 0, 0, 0.15);
    --text-primary: #1d1d1f;
    --text-secondary: #6e6e73;
    --text-tertiary: #86868b;
    --shadow-window: 0 30px 80px rgba(0, 0, 0, 0.15), 0 0 0 1px rgba(0, 0, 0, 0.08);
  }
}

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

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

body {
  min-height: 100vh;
  display: flex;
  flex-direction: column;
  overflow-x: hidden;
  position: relative;
  background-image: 
    radial-gradient(ellipse 80% 50% at 50% -20%, rgba(41, 151, 255, 0.15), transparent 70%),
    radial-gradient(ellipse 60% 40% at 85% 60%, rgba(153, 102, 217, 0.08), transparent 70%),
    radial-gradient(ellipse 50% 30% at 15% 40%, rgba(242, 102, 89, 0.06), transparent 70%);
  background-attachment: fixed;
}

a {
  color: inherit;
  text-decoration: none;
  transition: color var(--transition-fast);
}

img {
  max-width: 100%;
  height: auto;
  display: block;
}

button, input, select {
  font: inherit;
}

/* Container */
.container {
  width: 100%;
  max-width: 1200px;
  margin-left: auto;
  margin-right: auto;
  padding-left: 24px;
  padding-right: 24px;
}

.container-narrow {
  max-width: 860px;
}

/* Navigation Bar */
.navbar {
  position: sticky;
  top: 0;
  z-index: 100;
  backdrop-filter: blur(20px);
  -webkit-backdrop-filter: blur(20px);
  background: var(--bg-glass);
  border-bottom: 1px solid var(--border-color);
  transition: background-color var(--transition-fast), border-color var(--transition-fast);
}

.navbar .nav-container {
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: 68px;
}

.brand {
  display: flex;
  align-items: center;
  gap: 12px;
  font-size: 1.15rem;
  font-weight: 700;
  letter-spacing: -0.02em;
}

.brand-icon {
  width: 38px;
  height: 38px;
  border-radius: 9px;
  box-shadow: 0 4px 12px rgba(0, 0, 0, 0.4);
  transition: transform var(--transition-fast);
}

.brand:hover .brand-icon {
  transform: scale(1.05);
}

.nav-links {
  display: flex;
  align-items: center;
  gap: 28px;
  list-style: none;
}

.nav-link {
  font-size: 0.92rem;
  font-weight: 500;
  color: var(--text-secondary);
  transition: color var(--transition-fast);
  position: relative;
  padding: 6px 0;
}

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

.nav-link.active::after {
  content: '';
  position: absolute;
  bottom: 0;
  left: 0;
  width: 100%;
  height: 2px;
  background: var(--text-accent);
  border-radius: 2px;
}

.nav-cta {
  display: flex;
  align-items: center;
  gap: 12px;
}

.mobile-menu-btn {
  display: none;
  background: transparent;
  border: none;
  color: var(--text-primary);
  font-size: 1.5rem;
  cursor: pointer;
  padding: 4px;
}

/* Buttons */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  padding: 10px 20px;
  font-size: 0.95rem;
  font-weight: 600;
  border-radius: var(--radius-pill);
  cursor: pointer;
  transition: all var(--transition-fast);
  border: 1px solid transparent;
  white-space: nowrap;
}

.btn-primary {
  background: linear-gradient(180deg, #0077ed 0%, #005ecb 100%);
  color: #ffffff;
  box-shadow: 0 4px 14px rgba(0, 113, 227, 0.4), inset 0 1px 0 rgba(255, 255, 255, 0.25);
}

.btn-primary:hover {
  background: linear-gradient(180deg, #1985f5 0%, #0068de 100%);
  box-shadow: 0 6px 20px rgba(0, 113, 227, 0.55), inset 0 1px 0 rgba(255, 255, 255, 0.3);
  transform: translateY(-1px);
}

.btn-secondary {
  background: var(--bg-card);
  color: var(--text-primary);
  border-color: var(--border-color);
  backdrop-filter: blur(10px);
  -webkit-backdrop-filter: blur(10px);
}

.btn-secondary:hover {
  background: var(--bg-card-hover);
  border-color: var(--border-hover);
  transform: translateY(-1px);
}

.btn-large {
  padding: 14px 28px;
  font-size: 1.05rem;
}

.btn-icon-right svg {
  transition: transform var(--transition-fast);
}

.btn:hover .btn-icon-right svg {
  transform: translateX(3px);
}

/* Badges */
.badge {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 6px 14px;
  background: rgba(41, 151, 255, 0.12);
  border: 1px solid rgba(41, 151, 255, 0.3);
  border-radius: var(--radius-pill);
  font-size: 0.82rem;
  font-weight: 600;
  color: var(--text-accent);
  letter-spacing: 0.01em;
}

.badge-pulse::before {
  content: '';
  width: 8px;
  height: 8px;
  background: #34c759;
  border-radius: 50%;
  box-shadow: 0 0 10px #34c759;
  animation: pulseDot 2s infinite ease-in-out;
}

@keyframes pulseDot {
  0%, 100% { opacity: 1; transform: scale(1); }
  50% { opacity: 0.4; transform: scale(0.85); }
}

/* Hero Section */
.hero {
  padding: 80px 0 60px;
  text-align: center;
  position: relative;
}

.hero-content {
  max-width: 880px;
  margin: 0 auto;
}

.hero-title {
  font-size: clamp(2.4rem, 5.5vw, 4.2rem);
  font-weight: 800;
  line-height: 1.1;
  letter-spacing: -0.035em;
  margin-top: 20px;
  margin-bottom: 24px;
}

.hero-title .gradient-text {
  background: linear-gradient(135deg, #ffffff 30%, #a1a1a6 100%);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
}

.hero-subtitle {
  font-size: clamp(1.1rem, 2vw, 1.35rem);
  color: var(--text-secondary);
  max-width: 680px;
  margin: 0 auto 36px;
  line-height: 1.5;
}

.hero-actions {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 16px;
  flex-wrap: wrap;
  margin-bottom: 24px;
}

.hero-meta {
  font-size: 0.85rem;
  color: var(--text-tertiary);
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 18px;
  flex-wrap: wrap;
}

.hero-meta span {
  display: inline-flex;
  align-items: center;
  gap: 6px;
}

/* Mac Window Frame */
.mac-window {
  margin: 50px auto 0;
  max-width: 1040px;
  border-radius: var(--radius-md);
  background: var(--bg-secondary);
  border: 1px solid var(--border-color);
  box-shadow: var(--shadow-window);
  overflow: hidden;
  position: relative;
}

.mac-titlebar {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 12px 18px;
  background: rgba(255, 255, 255, 0.03);
  border-bottom: 1px solid var(--border-color);
}

.mac-traffic-lights {
  display: flex;
  gap: 8px;
}

.traffic-light {
  width: 12px;
  height: 12px;
  border-radius: 50%;
}

.traffic-light.close { background: #ff5f56; border: 1px solid #e0443e; }
.traffic-light.min { background: #ffbd2e; border: 1px solid #dea123; }
.traffic-light.max { background: #27c93f; border: 1px solid #1aab29; }

.mac-titlebar-text {
  font-size: 0.82rem;
  font-weight: 500;
  color: var(--text-tertiary);
  letter-spacing: -0.01em;
}

.mac-window-body {
  position: relative;
  background: #0d1017;
}

.hero-screenshot {
  width: 100%;
  display: block;
}

/* Interactive Treemap Demo Widget */
.demo-section {
  padding: 80px 0;
}

.section-header {
  text-align: center;
  max-width: 720px;
  margin: 0 auto 48px;
}

.section-tag {
  color: var(--text-accent);
  font-size: 0.85rem;
  font-weight: 700;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  margin-bottom: 12px;
}

.section-title {
  font-size: clamp(1.8rem, 3.5vw, 2.6rem);
  font-weight: 700;
  letter-spacing: -0.03em;
  margin-bottom: 16px;
  line-height: 1.2;
}

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

.interactive-treemap-card {
  background: var(--bg-card);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-lg);
  padding: 24px;
  box-shadow: var(--shadow-subtle);
  backdrop-filter: blur(12px);
  -webkit-backdrop-filter: blur(12px);
}

.demo-toolbar {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 16px;
  flex-wrap: wrap;
  margin-bottom: 20px;
  padding-bottom: 18px;
  border-bottom: 1px solid var(--border-color);
}

.demo-breadcrumbs {
  display: flex;
  align-items: center;
  gap: 8px;
  font-size: 0.9rem;
  font-weight: 600;
  color: var(--text-secondary);
}

.demo-breadcrumbs span.active {
  color: var(--text-primary);
  background: rgba(255, 255, 255, 0.08);
  padding: 4px 10px;
  border-radius: var(--radius-sm);
}

.demo-filters {
  display: flex;
  gap: 8px;
  flex-wrap: wrap;
}

.demo-filter-btn {
  background: transparent;
  border: 1px solid var(--border-color);
  color: var(--text-secondary);
  font-size: 0.8rem;
  padding: 6px 12px;
  border-radius: var(--radius-pill);
  cursor: pointer;
  transition: all var(--transition-fast);
}

.demo-filter-btn:hover,
.demo-filter-btn.active {
  background: rgba(41, 151, 255, 0.15);
  border-color: var(--text-accent);
  color: #ffffff;
}

.treemap-canvas-container {
  position: relative;
  width: 100%;
  height: 440px;
  border-radius: var(--radius-md);
  overflow: hidden;
  background: #080a0e;
  border: 1px solid var(--border-color);
}

.treemap-grid {
  display: grid;
  grid-template-columns: 2fr 1.3fr 1.7fr;
  grid-template-rows: 1.3fr 1fr;
  gap: 4px;
  width: 100%;
  height: 100%;
  padding: 4px;
}

.treemap-block {
  border-radius: 6px;
  padding: 12px;
  display: flex;
  flex-direction: column;
  justify-content: space-between;
  position: relative;
  cursor: pointer;
  overflow: hidden;
  transition: transform var(--transition-fast), filter var(--transition-fast), box-shadow var(--transition-fast);
  user-select: none;
}

.treemap-block::before {
  content: '';
  position: absolute;
  inset: 0;
  background: linear-gradient(180deg, rgba(255, 255, 255, 0.15) 0%, transparent 100%);
  pointer-events: none;
}

.treemap-block:hover {
  transform: scale(0.99);
  filter: brightness(1.15);
  box-shadow: inset 0 0 0 2px rgba(255, 255, 255, 0.4), 0 8px 24px rgba(0, 0, 0, 0.5);
  z-index: 5;
}

.treemap-block.dimmed {
  opacity: 0.25;
  filter: grayscale(0.8);
}

.block-name {
  font-size: 0.85rem;
  font-weight: 700;
  color: #ffffff;
  text-shadow: 0 1px 3px rgba(0, 0, 0, 0.6);
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
}

.block-size {
  font-size: 0.8rem;
  font-weight: 600;
  color: rgba(255, 255, 255, 0.9);
  text-shadow: 0 1px 2px rgba(0, 0, 0, 0.6);
}

.demo-legend {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 16px;
  flex-wrap: wrap;
  margin-top: 18px;
  font-size: 0.8rem;
  color: var(--text-secondary);
}

.legend-item {
  display: flex;
  align-items: center;
  gap: 6px;
}

.legend-color {
  width: 10px;
  height: 10px;
  border-radius: 3px;
}

.demo-tooltip {
  position: absolute;
  pointer-events: none;
  background: rgba(18, 22, 31, 0.95);
  border: 1px solid var(--border-hover);
  padding: 8px 12px;
  border-radius: var(--radius-sm);
  font-size: 0.82rem;
  color: #ffffff;
  box-shadow: 0 10px 25px rgba(0, 0, 0, 0.6);
  backdrop-filter: blur(8px);
  display: none;
  z-index: 100;
}

/* Feature Cards Grid */
.features-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(320px, 1fr));
  gap: 24px;
}

.feature-card {
  background: var(--bg-card);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-lg);
  padding: 32px 28px;
  transition: transform var(--transition-fast), border-color var(--transition-fast), box-shadow var(--transition-fast);
  backdrop-filter: blur(10px);
  -webkit-backdrop-filter: blur(10px);
  position: relative;
  overflow: hidden;
}

.feature-card::before {
  content: '';
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  height: 1px;
  background: linear-gradient(90deg, transparent, rgba(255, 255, 255, 0.15), transparent);
}

.feature-card:hover {
  transform: translateY(-4px);
  border-color: var(--border-hover);
  box-shadow: 0 16px 36px rgba(0, 0, 0, 0.35);
}

.feature-icon-wrapper {
  width: 48px;
  height: 48px;
  border-radius: var(--radius-md);
  background: rgba(41, 151, 255, 0.12);
  display: flex;
  align-items: center;
  justify-content: center;
  color: var(--text-accent);
  margin-bottom: 20px;
}

.feature-title {
  font-size: 1.25rem;
  font-weight: 700;
  letter-spacing: -0.02em;
  margin-bottom: 10px;
}

.feature-description {
  font-size: 0.95rem;
  color: var(--text-secondary);
  line-height: 1.55;
}

/* Comparison Table */
.comparison-section {
  padding: 80px 0;
}

.table-wrapper {
  overflow-x: auto;
  border-radius: var(--radius-lg);
  border: 1px solid var(--border-color);
  background: var(--bg-card);
  backdrop-filter: blur(10px);
  -webkit-backdrop-filter: blur(10px);
}

.compare-table {
  width: 100%;
  border-collapse: collapse;
  text-align: left;
}

.compare-table th,
.compare-table td {
  padding: 18px 24px;
  border-bottom: 1px solid var(--border-color);
  font-size: 0.92rem;
}

.compare-table th {
  background: rgba(255, 255, 255, 0.02);
  font-weight: 700;
  color: var(--text-primary);
}

.compare-table th.highlight-col,
.compare-table td.highlight-col {
  background: rgba(41, 151, 255, 0.06);
  border-left: 1px solid rgba(41, 151, 255, 0.2);
  border-right: 1px solid rgba(41, 151, 255, 0.2);
}

.compare-table td.highlight-col {
  font-weight: 600;
  color: #ffffff;
}

.status-check {
  color: #34c759;
  font-weight: 700;
  display: inline-flex;
  align-items: center;
  gap: 6px;
}

.status-cross {
  color: #ff453a;
  font-weight: 700;
  display: inline-flex;
  align-items: center;
  gap: 6px;
}

.status-warn {
  color: #ff9f0a;
}

/* Steps / How it Works */
.steps-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
  gap: 28px;
}

.step-card {
  position: relative;
  background: var(--bg-card);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-lg);
  padding: 32px 24px;
}

.step-number {
  font-size: 2.8rem;
  font-weight: 800;
  color: rgba(41, 151, 255, 0.25);
  line-height: 1;
  margin-bottom: 16px;
}

.step-title {
  font-size: 1.15rem;
  font-weight: 700;
  margin-bottom: 8px;
}

.step-desc {
  font-size: 0.92rem;
  color: var(--text-secondary);
}

/* Keyboard Shortcuts Section */
.shortcuts-card {
  background: var(--bg-card);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-lg);
  padding: 32px;
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(240px, 1fr));
  gap: 20px;
}

.shortcut-item {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 12px 16px;
  background: rgba(255, 255, 255, 0.03);
  border-radius: var(--radius-md);
  border: 1px solid var(--border-color);
}

kbd {
  display: inline-block;
  padding: 4px 8px;
  font-family: var(--font-sans);
  font-size: 0.85rem;
  font-weight: 600;
  color: var(--text-primary);
  background: rgba(255, 255, 255, 0.1);
  border: 1px solid rgba(255, 255, 255, 0.2);
  border-radius: 6px;
  box-shadow: 0 2px 0 rgba(0, 0, 0, 0.4);
}

/* FAQ Accordion */
.faq-list {
  display: flex;
  flex-direction: column;
  gap: 16px;
}

.faq-item {
  background: var(--bg-card);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-md);
  overflow: hidden;
  transition: border-color var(--transition-fast);
}

.faq-item:hover {
  border-color: var(--border-hover);
}

.faq-question {
  width: 100%;
  text-align: left;
  padding: 20px 24px;
  background: transparent;
  border: none;
  color: var(--text-primary);
  font-size: 1.05rem;
  font-weight: 600;
  display: flex;
  align-items: center;
  justify-content: space-between;
  cursor: pointer;
}

.faq-chevron {
  transition: transform var(--transition-fast);
  color: var(--text-secondary);
}

.faq-item.open .faq-chevron {
  transform: rotate(180deg);
  color: var(--text-accent);
}

.faq-answer {
  max-height: 0;
  overflow: hidden;
  transition: max-height 0.35s ease-out, padding 0.35s ease-out;
  padding: 0 24px;
  color: var(--text-secondary);
  font-size: 0.95rem;
  line-height: 1.6;
}

.faq-item.open .faq-answer {
  max-height: 800px;
  padding-bottom: 24px;
}

.faq-answer strong {
  color: var(--text-primary);
}

/* Call to Action Banner */
.cta-banner {
  padding: 80px 0;
  text-align: center;
}

.cta-box {
  background: linear-gradient(135deg, rgba(0, 113, 227, 0.2) 0%, rgba(153, 102, 217, 0.15) 100%), var(--bg-card);
  border: 1px solid rgba(41, 151, 255, 0.3);
  border-radius: var(--radius-xl);
  padding: 60px 40px;
  position: relative;
  overflow: hidden;
  box-shadow: var(--shadow-glow);
}

.cta-title {
  font-size: clamp(2rem, 4vw, 3rem);
  font-weight: 800;
  letter-spacing: -0.03em;
  margin-bottom: 16px;
}

.cta-desc {
  font-size: 1.15rem;
  color: var(--text-secondary);
  max-width: 600px;
  margin: 0 auto 32px;
}

/* Download Details Page Styling */
.download-hero {
  padding: 60px 0 40px;
  text-align: center;
}

.download-box {
  background: var(--bg-card);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-xl);
  padding: 48px;
  max-width: 760px;
  margin: 0 auto;
  box-shadow: var(--shadow-subtle);
}

.download-app-icon {
  width: 96px;
  height: 96px;
  margin: 0 auto 24px;
  border-radius: 22px;
  box-shadow: 0 10px 30px rgba(0, 0, 0, 0.5);
}

.checksum-bar {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 12px;
  background: rgba(0, 0, 0, 0.4);
  border: 1px solid var(--border-color);
  padding: 10px 16px;
  border-radius: var(--radius-sm);
  font-family: var(--font-mono);
  font-size: 0.8rem;
  color: var(--text-secondary);
  margin-top: 24px;
  overflow-x: auto;
}

.copy-btn {
  background: rgba(255, 255, 255, 0.08);
  border: 1px solid var(--border-color);
  color: var(--text-primary);
  border-radius: 6px;
  padding: 4px 10px;
  font-size: 0.75rem;
  cursor: pointer;
  white-space: nowrap;
  transition: all var(--transition-fast);
}

.copy-btn:hover {
  background: rgba(255, 255, 255, 0.15);
}

/* Guide Page Callouts */
.guide-step {
  display: flex;
  gap: 24px;
  margin-bottom: 36px;
  background: var(--bg-card);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-lg);
  padding: 28px;
}

.guide-step-num {
  flex-shrink: 0;
  width: 44px;
  height: 44px;
  border-radius: 50%;
  background: var(--accent-blue);
  color: #ffffff;
  font-size: 1.2rem;
  font-weight: 700;
  display: flex;
  align-items: center;
  justify-content: center;
  box-shadow: 0 4px 12px rgba(0, 113, 227, 0.4);
}

.guide-step-body h3 {
  font-size: 1.2rem;
  margin-bottom: 10px;
}

.guide-step-body p {
  color: var(--text-secondary);
  font-size: 0.95rem;
  line-height: 1.6;
}

.callout {
  padding: 18px 22px;
  border-radius: var(--radius-md);
  margin: 18px 0;
  font-size: 0.92rem;
  display: flex;
  gap: 14px;
  align-items: flex-start;
}

.callout-info {
  background: rgba(41, 151, 255, 0.1);
  border: 1px solid rgba(41, 151, 255, 0.3);
  color: #bce0fd;
}

.callout-tip {
  background: rgba(52, 199, 89, 0.1);
  border: 1px solid rgba(52, 199, 89, 0.3);
  color: #bbf7d0;
}

/* Footer */
.footer {
  margin-top: auto;
  background: #07090d;
  border-top: 1px solid var(--border-color);
  padding: 60px 0 30px;
  font-size: 0.9rem;
  color: var(--text-secondary);
}

.footer-top {
  display: grid;
  grid-template-columns: 2fr repeat(3, 1fr);
  gap: 40px;
  margin-bottom: 48px;
}

.footer-brand p {
  margin-top: 12px;
  font-size: 0.88rem;
  color: var(--text-tertiary);
  max-width: 320px;
}

.footer-col h4 {
  font-size: 0.85rem;
  font-weight: 700;
  color: var(--text-primary);
  text-transform: uppercase;
  letter-spacing: 0.05em;
  margin-bottom: 16px;
}

.footer-col ul {
  list-style: none;
  display: flex;
  flex-direction: column;
  gap: 10px;
}

.footer-col a:hover {
  color: var(--text-accent);
}

.footer-bottom {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding-top: 24px;
  border-top: 1px solid var(--border-color);
  font-size: 0.82rem;
  color: var(--text-tertiary);
  flex-wrap: wrap;
  gap: 12px;
}

.footer-email {
  color: var(--text-accent);
  font-weight: 600;
}

/* Responsive Breakpoints */
@media (max-width: 900px) {
  .footer-top {
    grid-template-columns: 1fr 1fr;
    gap: 30px;
  }
}

@media (max-width: 768px) {
  .nav-links {
    display: none;
    position: absolute;
    top: 68px;
    left: 0;
    right: 0;
    background: var(--bg-secondary);
    flex-direction: column;
    padding: 24px;
    border-bottom: 1px solid var(--border-color);
    box-shadow: 0 20px 40px rgba(0,0,0,0.5);
  }

  .nav-links.mobile-open {
    display: flex;
  }

  .mobile-menu-btn {
    display: block;
  }

  .hero {
    padding: 50px 0 40px;
  }

  .treemap-canvas-container {
    height: 340px;
  }

  .treemap-grid {
    grid-template-columns: 1fr 1fr;
  }

  .guide-step {
    flex-direction: column;
    gap: 14px;
  }

  .footer-top {
    grid-template-columns: 1fr;
  }

  .footer-bottom {
    flex-direction: column;
    align-items: flex-start;
  }
}