/* ==========================================================================
   GokuTrap Official Portal Stylesheet
   Adheres to: Professional Software Engineering & UI/UX Standards
   Zero-gradient policy, strict token system, accessible contrast & semantics
   ========================================================================== */

:root {
  /* Color System - Solid Layers, Zero Gradients */
  --bg-canvas: #090c15;
  --bg-surface: #111624;
  --bg-surface-raised: #182033;
  --bg-surface-active: #1f2a42;
  --bg-code: #0d111d;

  --border-subtle: #202b44;
  --border-medium: #2e3d5e;
  --border-focus: #f59e0b;

  --text-primary: #f1f5f9;
  --text-secondary: #94a3b8;
  --text-muted: #64748b;

  /* Accent Tokens */
  --accent-amber: #f59e0b;
  --accent-amber-hover: #d97706;
  --accent-amber-subtle: #291d07;

  --accent-cyan: #38bdf8;
  --accent-cyan-hover: #0284c7;
  --accent-cyan-subtle: #082438;

  --color-success: #10b981;
  --color-success-subtle: #06281e;
  --color-error: #ef4444;

  /* Typography */
  --font-sans: Inter, -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, system-ui, sans-serif;
  --font-mono: "Cascadia Code", "SFMono-Regular", Consolas, "Liberation Mono", Menlo, monospace;

  /* Spacing Scale */
  --space-2: 2px;
  --space-4: 4px;
  --space-8: 8px;
  --space-12: 12px;
  --space-16: 16px;
  --space-20: 20px;
  --space-24: 24px;
  --space-32: 32px;
  --space-40: 40px;
  --space-48: 48px;
  --space-64: 64px;
  --space-80: 80px;

  /* Geometry */
  --radius-sm: 6px;
  --radius-md: 10px;
  --radius-lg: 14px;
  --radius-full: 9999px;

  /* Layout */
  --container-max: 1160px;
  --header-height: 72px;

  /* Transitions */
  --transition-fast: 150ms ease;
  --transition-normal: 250ms ease;
}

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

html {
  font-family: var(--font-sans);
  font-size: 16px;
  line-height: 1.6;
  color: var(--text-primary);
  background-color: var(--bg-canvas);
  scroll-behavior: smooth;
  -webkit-text-size-adjust: 100%;
}

@media (prefers-reduced-motion: reduce) {
  html {
    scroll-behavior: auto;
  }
  *, *::before, *::after {
    animation-duration: 0.01ms !important;
    animation-iteration-count: 1 !important;
    transition-duration: 0.01ms !important;
    scroll-behavior: auto !important;
  }
}

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

/* Accessibility: Skip Navigation */
.skip-link {
  position: absolute;
  top: -9999px;
  left: var(--space-16);
  background: var(--accent-amber);
  color: #000000;
  padding: var(--space-8) var(--space-16);
  font-weight: 600;
  border-radius: var(--radius-sm);
  z-index: 9999;
  text-decoration: none;
}
.skip-link:focus {
  top: var(--space-16);
}

/* Focus Visibility */
:focus-visible {
  outline: 2px solid var(--border-focus);
  outline-offset: 2px;
}

/* Typography Hierarchy */
h1, h2, h3, h4 {
  color: var(--text-primary);
  font-weight: 700;
  line-height: 1.25;
}

h1 {
  font-size: clamp(2rem, 4vw, 3.25rem);
  letter-spacing: -0.025em;
}

h2 {
  font-size: clamp(1.5rem, 3vw, 2.25rem);
  letter-spacing: -0.02em;
  margin-bottom: var(--space-12);
}

h3 {
  font-size: 1.25rem;
  margin-bottom: var(--space-8);
}

p {
  color: var(--text-secondary);
  margin-bottom: var(--space-16);
}

p:last-child {
  margin-bottom: 0;
}

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

a:hover {
  color: var(--text-primary);
}

code, kbd {
  font-family: var(--font-mono);
  font-size: 0.875rem;
}

/* Layout Container */
.container {
  width: 100%;
  max-width: var(--container-max);
  margin-left: auto;
  margin-right: auto;
  padding-left: var(--space-24);
  padding-right: var(--space-24);
}

/* Site Navigation Header */
.site-header {
  position: sticky;
  top: 0;
  height: var(--header-height);
  background-color: var(--bg-surface);
  border-bottom: 1px solid var(--border-subtle);
  z-index: 100;
  display: flex;
  align-items: center;
}

.site-header .container {
  display: flex;
  align-items: center;
  justify-content: space-between;
}

.brand-link {
  display: flex;
  align-items: center;
  gap: var(--space-12);
  color: var(--text-primary);
  font-weight: 700;
  font-size: 1.15rem;
}

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

.brand-logo-img {
  width: 36px;
  height: 36px;
  border-radius: var(--radius-sm);
  display: block;
}

.brand-badge {
  font-size: 0.75rem;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.05em;
  padding: 2px 8px;
  border-radius: var(--radius-full);
  background-color: var(--accent-amber-subtle);
  color: var(--accent-amber);
  border: 1px solid var(--accent-amber);
}

.nav-links {
  display: flex;
  align-items: center;
  gap: var(--space-24);
  list-style: none;
}

.nav-link {
  color: var(--text-secondary);
  font-weight: 500;
  font-size: 0.95rem;
  transition: color var(--transition-fast);
}

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

.nav-actions {
  display: flex;
  align-items: center;
  gap: var(--space-12);
}

/* Buttons */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: var(--space-8);
  font-family: var(--font-sans);
  font-size: 0.95rem;
  font-weight: 600;
  line-height: 1;
  padding: var(--space-12) var(--space-20);
  border-radius: var(--radius-md);
  border: 1px solid transparent;
  cursor: pointer;
  text-decoration: none;
  transition: background-color var(--transition-fast), border-color var(--transition-fast), color var(--transition-fast);
  white-space: nowrap;
}

.btn-primary {
  background-color: var(--accent-amber);
  color: #0b0d13;
  border-color: var(--accent-amber);
}
.btn-primary:hover {
  background-color: var(--accent-amber-hover);
  border-color: var(--accent-amber-hover);
  color: #0b0d13;
}

.btn-secondary {
  background-color: var(--bg-surface-raised);
  color: var(--text-primary);
  border-color: var(--border-medium);
}
.btn-secondary:hover {
  background-color: var(--bg-surface-active);
  border-color: var(--text-muted);
  color: var(--text-primary);
}

.btn-ghost {
  background-color: transparent;
  color: var(--text-secondary);
  border-color: var(--border-subtle);
}
.btn-ghost:hover {
  background-color: var(--bg-surface-raised);
  color: var(--text-primary);
}

.btn-sm {
  font-size: 0.85rem;
  padding: var(--space-8) var(--space-12);
  border-radius: var(--radius-sm);
}

.btn-lg {
  font-size: 1.05rem;
  padding: var(--space-16) var(--space-24);
  border-radius: var(--radius-md);
}

/* SVG Icon Base */
.icon {
  width: 1.2em;
  height: 1.2em;
  stroke-width: 2;
  stroke: currentColor;
  fill: none;
  stroke-linecap: round;
  stroke-linejoin: round;
  flex-shrink: 0;
}

/* Hero Section */
.hero-section {
  padding-top: var(--space-64);
  padding-bottom: var(--space-64);
  background-color: var(--bg-canvas);
  border-bottom: 1px solid var(--border-subtle);
}

.hero-grid {
  display: grid;
  grid-template-columns: 1.1fr 0.9fr;
  gap: var(--space-48);
  align-items: center;
}

.hero-content {
  display: flex;
  flex-direction: column;
  align-items: flex-start;
}

.hero-pill {
  display: inline-flex;
  align-items: center;
  gap: var(--space-8);
  padding: var(--space-4) var(--space-12);
  background-color: var(--bg-surface-raised);
  border: 1px solid var(--border-subtle);
  border-radius: var(--radius-full);
  font-size: 0.85rem;
  color: var(--text-secondary);
  margin-bottom: var(--space-20);
}

.hero-pill-status {
  width: 8px;
  height: 8px;
  border-radius: 50%;
  background-color: var(--color-success);
}

.hero-title {
  margin-bottom: var(--space-16);
}

.hero-title span {
  color: var(--accent-amber);
}

.hero-description {
  font-size: 1.15rem;
  line-height: 1.6;
  color: var(--text-secondary);
  margin-bottom: var(--space-32);
}

.hero-cta-group {
  display: flex;
  flex-wrap: wrap;
  gap: var(--space-16);
  margin-bottom: var(--space-32);
}

.hero-meta {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: var(--space-24);
  font-size: 0.875rem;
  color: var(--text-muted);
}

.meta-item {
  display: flex;
  align-items: center;
  gap: var(--space-8);
}

/* Hero Visual / Showcase */
.hero-visual {
  position: relative;
  background-color: var(--bg-surface);
  border: 1px solid var(--border-subtle);
  border-radius: var(--radius-lg);
  padding: var(--space-16);
}

.showcase-frame {
  width: 100%;
  height: auto;
  border-radius: var(--radius-md);
  display: block;
  border: 1px solid var(--border-medium);
}

/* Release Banner & Live Fetcher */
.release-banner {
  background-color: var(--bg-surface);
  border: 1px solid var(--border-subtle);
  border-radius: var(--radius-md);
  padding: var(--space-16) var(--space-20);
  margin-top: calc(-1 * var(--space-24));
  margin-bottom: var(--space-48);
  display: flex;
  align-items: center;
  justify-content: space-between;
  flex-wrap: wrap;
  gap: var(--space-16);
}

.release-info {
  display: flex;
  align-items: center;
  gap: var(--space-12);
}

.release-tag {
  font-family: var(--font-mono);
  font-weight: 700;
  font-size: 0.9rem;
  background-color: var(--bg-surface-raised);
  color: var(--accent-cyan);
  padding: 4px 10px;
  border-radius: var(--radius-sm);
  border: 1px solid var(--border-medium);
}

.release-text {
  font-size: 0.925rem;
  color: var(--text-secondary);
}

/* Feature Grid Section */
.section {
  padding-top: var(--space-80);
  padding-bottom: var(--space-80);
  border-bottom: 1px solid var(--border-subtle);
}

.section-alt {
  background-color: var(--bg-surface);
}

.section-header {
  text-align: center;
  max-width: 680px;
  margin: 0 auto var(--space-48) auto;
}

.section-label {
  font-size: 0.8rem;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.08em;
  color: var(--accent-amber);
  margin-bottom: var(--space-8);
}

.feature-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(320px, 1fr));
  gap: var(--space-24);
}

.feature-card {
  background-color: var(--bg-surface);
  border: 1px solid var(--border-subtle);
  border-radius: var(--radius-md);
  padding: var(--space-24);
  display: flex;
  flex-direction: column;
  transition: border-color var(--transition-fast), background-color var(--transition-fast);
}

.section-alt .feature-card {
  background-color: var(--bg-surface-raised);
}

.feature-card:hover {
  border-color: var(--border-medium);
  background-color: var(--bg-surface-raised);
}

.feature-icon-wrapper {
  width: 44px;
  height: 44px;
  border-radius: var(--radius-sm);
  background-color: var(--bg-surface-raised);
  border: 1px solid var(--border-medium);
  color: var(--accent-amber);
  display: flex;
  align-items: center;
  justify-content: center;
  margin-bottom: var(--space-16);
}

.feature-icon-wrapper.alt-cyan {
  color: var(--accent-cyan);
}

.feature-title {
  font-size: 1.15rem;
  margin-bottom: var(--space-8);
}

.feature-desc {
  font-size: 0.925rem;
  color: var(--text-secondary);
  line-height: 1.55;
  margin-bottom: var(--space-16);
  flex-grow: 1;
}

.feature-list {
  list-style: none;
  display: flex;
  flex-direction: column;
  gap: var(--space-8);
  font-size: 0.875rem;
  color: var(--text-muted);
}

/* A headline feature card spans the full grid row and flows its bullets into columns. */
.feature-card-wide {
  grid-column: 1 / -1;
}

.feature-card-wide .feature-list {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
  gap: var(--space-12);
}

@media (max-width: 640px) {
  .feature-card-wide {
    grid-column: auto;
  }
}

.feature-list-item {
  display: flex;
  align-items: center;
  gap: var(--space-8);
}

.feature-list-item .icon {
  width: 14px;
  height: 14px;
  color: var(--color-success);
}

/* FastFlag Interactive Tool Section */
.tool-container {
  background-color: var(--bg-surface-raised);
  border: 1px solid var(--border-subtle);
  border-radius: var(--radius-lg);
  overflow: hidden;
}

.tool-header {
  padding: var(--space-16) var(--space-24);
  background-color: var(--bg-surface);
  border-bottom: 1px solid var(--border-subtle);
  display: flex;
  align-items: center;
  justify-content: space-between;
  flex-wrap: wrap;
  gap: var(--space-12);
}

.tool-tabs {
  display: flex;
  gap: var(--space-8);
  overflow-x: auto;
  padding-bottom: 2px;
}

.tool-tab-btn {
  background: transparent;
  color: var(--text-secondary);
  border: 1px solid transparent;
  padding: var(--space-8) var(--space-16);
  border-radius: var(--radius-sm);
  font-weight: 500;
  font-size: 0.9rem;
  cursor: pointer;
  transition: all var(--transition-fast);
}

.tool-tab-btn:hover {
  color: var(--text-primary);
  background-color: var(--bg-surface-raised);
}

.tool-tab-btn[aria-selected="true"] {
  color: var(--text-primary);
  background-color: var(--bg-surface-raised);
  border-color: var(--border-medium);
  font-weight: 600;
}

.tool-content {
  padding: var(--space-24);
}

.tool-code-preview {
  position: relative;
  background-color: var(--bg-code);
  border: 1px solid var(--border-subtle);
  border-radius: var(--radius-md);
  padding: var(--space-20);
  font-family: var(--font-mono);
  font-size: 0.85rem;
  color: #e2e8f0;
  overflow-x: auto;
  max-height: 380px;
}

.tool-code-actions {
  position: absolute;
  top: var(--space-12);
  right: var(--space-12);
}

/* Installation Guide & Terminal Command Box */
.install-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(320px, 1fr));
  gap: var(--space-32);
}

.install-step-card {
  background-color: var(--bg-surface);
  border: 1px solid var(--border-subtle);
  border-radius: var(--radius-md);
  padding: var(--space-24);
}

.step-badge {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 28px;
  height: 28px;
  border-radius: 50%;
  background-color: var(--accent-amber-subtle);
  color: var(--accent-amber);
  border: 1px solid var(--accent-amber);
  font-weight: 700;
  font-size: 0.85rem;
  margin-bottom: var(--space-12);
}

.cmd-box {
  position: relative;
  display: flex;
  align-items: center;
  justify-content: space-between;
  background-color: var(--bg-code);
  border: 1px solid var(--border-subtle);
  border-radius: var(--radius-sm);
  padding: var(--space-8) var(--space-12);
  margin-top: var(--space-12);
  font-family: var(--font-mono);
  font-size: 0.85rem;
  color: #e2e8f0;
}

.cmd-text {
  overflow-x: auto;
  white-space: nowrap;
  padding-right: var(--space-12);
}

/* System Requirements Table */
.table-wrapper {
  overflow-x: auto;
  border: 1px solid var(--border-subtle);
  border-radius: var(--radius-md);
  background-color: var(--bg-surface);
}

table {
  width: 100%;
  border-collapse: collapse;
  text-align: left;
  font-size: 0.925rem;
}

th, td {
  padding: var(--space-12) var(--space-20);
  border-bottom: 1px solid var(--border-subtle);
}

th {
  background-color: var(--bg-surface-raised);
  color: var(--text-primary);
  font-weight: 600;
}

tr:last-child td {
  border-bottom: none;
}

td:first-child {
  font-weight: 600;
  color: var(--text-primary);
}

/* FAQ Accordion */
.faq-list {
  display: flex;
  flex-direction: column;
  gap: var(--space-16);
  max-width: 800px;
  margin: 0 auto;
}

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

.faq-item[open] {
  border-color: var(--border-medium);
}

.faq-question {
  padding: var(--space-20);
  font-weight: 600;
  color: var(--text-primary);
  cursor: pointer;
  display: flex;
  align-items: center;
  justify-content: space-between;
  user-select: none;
  list-style: none;
}

.faq-question::-webkit-details-marker {
  display: none;
}

.faq-icon {
  width: 18px;
  height: 18px;
  color: var(--text-muted);
  transition: transform var(--transition-fast);
}

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

.faq-answer {
  padding: 0 var(--space-20) var(--space-20) var(--space-20);
  color: var(--text-secondary);
  font-size: 0.95rem;
  line-height: 1.6;
}

/* Site Footer */
.site-footer {
  margin-top: auto;
  background-color: var(--bg-surface);
  border-top: 1px solid var(--border-subtle);
  padding: var(--space-48) 0 var(--space-32) 0;
}

.footer-grid {
  display: grid;
  grid-template-columns: 2fr 1fr 1fr;
  gap: var(--space-48);
  margin-bottom: var(--space-48);
}

.footer-brand-desc {
  max-width: 380px;
  font-size: 0.9rem;
  color: var(--text-muted);
  margin-top: var(--space-12);
}

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

.footer-nav-list {
  list-style: none;
  display: flex;
  flex-direction: column;
  gap: var(--space-12);
  font-size: 0.9rem;
}

.footer-nav-list a {
  color: var(--text-muted);
}

.footer-nav-list a:hover {
  color: var(--text-primary);
}

.footer-bottom {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding-top: var(--space-24);
  border-top: 1px solid var(--border-subtle);
  font-size: 0.85rem;
  color: var(--text-muted);
  flex-wrap: wrap;
  gap: var(--space-12);
}

/* Responsive Media Queries */
@media (max-width: 900px) {
  .hero-grid {
    grid-template-columns: 1fr;
    gap: var(--space-32);
  }

  .footer-grid {
    grid-template-columns: 1fr;
    gap: var(--space-32);
  }
}

@media (max-width: 640px) {
  .nav-links {
    display: none;
  }

  .hero-cta-group {
    flex-direction: column;
    width: 100%;
  }

  .hero-cta-group .btn {
    width: 100%;
  }

  .release-banner {
    flex-direction: column;
    align-items: flex-start;
  }
}