* {
  margin: 0;
  padding: 0;
  box-sizing: border-box;
}
html {
  scroll-behavior: smooth;
}
body {
  font-family: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, Helvetica, Arial, sans-serif;
  color: #2c3e50;
  background: #fff;
  line-height: 1.6;
  -webkit-font-smoothing: antialiased;
  text-rendering: optimizeLegibility;
}
a {
  color: inherit;
  text-decoration: none;
}
img {
  max-width: 100%;
}
.container {
  max-width: 1100px;
  margin: 0 auto;
  padding: 0 24px;
}
.container-narrow {
  max-width: 720px;
}
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  padding: 10px 22px;
  border-radius: 6px;
  font-size: 15px;
  font-weight: 500;
  cursor: pointer;
  transition: all 0.2s ease;
  border: 1px solid transparent;
}
.btn-primary {
  background: #2d9cdb;
  color: #fff;
}
.btn-primary:hover {
  background: #2d8bcc;
  transform: translateY(-1px);
  box-shadow: 0 6px 16px rgba(45,156,219,0.28);
}
.btn-ghost {
  color: #2c3e50;
}
.btn-ghost:hover {
  color: #2d9cdb;
}
.btn-lg {
  padding: 14px 32px;
  font-size: 17px;
}
.site-header {
  position: sticky;
  top: 0;
  z-index: 100;
  background: rgba(255,255,255,0.85);
  backdrop-filter: blur(10px);
  border-bottom: 1px solid #e6e9ed;
  transition: box-shadow 0.2s ease;
}
.site-header.scrolled {
  box-shadow: 0 2px 12px rgba(0,0,0,0.06);
}
.header-inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: 64px;
}
.logo {
  display: flex;
  align-items: center;
  gap: 8px;
  font-weight: 700;
  font-size: 20px;
  color: #2c3e50;
}
.logo-icon {
  color: #2d9cdb;
}
.site-nav {
  display: flex;
  align-items: center;
  gap: 28px;
}
.nav-link {
  font-size: 15px;
  color: #6a7684;
  font-weight: 500;
  transition: color 0.2s;
}
.nav-link:hover {
  color: #2d9cdb;
}
.nav-toggle {
  display: none;
  flex-direction: column;
  gap: 5px;
  background: none;
  border: none;
  cursor: pointer;
}
.nav-toggle span {
  display: block;
  width: 24px;
  height: 2px;
  background: #2c3e50;
  transition: all 0.3s;
}
.hero {
  padding: 100px 0 80px;
  text-align: center;
  background: linear-gradient(180deg, #f3faff 0%, #fff 100%);
}
.hero-title {
  font-size: 56px;
  font-weight: 700;
  line-height: 1.15;
  letter-spacing: -1px;
  margin-bottom: 24px;
}
.hero-subtitle {
  font-size: 19px;
  color: #6a7684;
  max-width: 640px;
  margin: 0 auto 36px;
}
.hero-actions {
  display: flex;
  gap: 16px;
  justify-content: center;
  margin-bottom: 64px;
}
.window-mockup {
  max-width: 780px;
  margin: 0 auto;
  background: #fff;
  border-radius: 12px;
  box-shadow: 0 24px 60px rgba(0,0,0,0.12);
  overflow: hidden;
  text-align: left;
  border: 1px solid #e6e9ed;
}
.window-bar {
  display: flex;
  align-items: center;
  gap: 8px;
  padding: 12px 16px;
  background: #f8f9fa;
  border-bottom: 1px solid #e6e9ed;
}
.dot {
  width: 12px;
  height: 12px;
  border-radius: 50%;
  display: inline-block;
}
.dot-red {
  background: #ff5f57;
}
.dot-yellow {
  background: #febc2e;
}
.dot-green {
  background: #28c840;
}
.window-title {
  margin-left: 12px;
  font-size: 13px;
  color: #6a7684;
}
.window-body {
  padding: 32px 40px;
}
.window-body h2 {
  font-size: 26px;
  margin-bottom: 16px;
  color: #2c3e50;
}
.window-body p {
  margin-bottom: 14px;
  color: #2c3e50;
}
.window-body blockquote {
  border-left: 3px solid #2d9cdb;
  padding-left: 16px;
  color: #6a7684;
  font-style: italic;
  margin: 16px 0;
}
.window-body ul {
  margin: 0 0 16px 20px;
  color: #2c3e50;
}
.window-body pre {
  background: #2d2d2d;
  color: #f8f8f2;
  padding: 16px 20px;
  border-radius: 8px;
  font-family: 'SF Mono', Monaco, Consolas, monospace;
  font-size: 14px;
  overflow-x: auto;
}
.section {
  padding: 90px 0;
}
.section-title {
  font-size: 38px;
  font-weight: 700;
  text-align: center;
  margin-bottom: 16px;
  letter-spacing: -0.5px;
}
.section-desc {
  font-size: 18px;
  color: #6a7684;
  text-align: center;
  max-width: 600px;
  margin: 0 auto 56px;
}
.themes {
  background: #f8f9fa;
}
.feature-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 32px;
}
.feature-card {
  padding: 32px;
  border-radius: 12px;
  background: #fff;
  border: 1px solid #e6e9ed;
  transition: all 0.25s ease;
}
.feature-card:hover {
  transform: translateY(-4px);
  box-shadow: 0 12px 32px rgba(45,156,219,0.18);
  border-color: transparent;
}
.feature-icon {
  font-size: 36px;
  margin-bottom: 16px;
}
.feature-card h3 {
  font-size: 20px;
  margin-bottom: 10px;
}
.feature-card p {
  color: #6a7684;
  font-size: 15px;
}
.theme-grid {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 24px;
}
.theme-swatch {
  height: 160px;
  border-radius: 12px;
  display: flex;
  align-items: flex-end;
  padding: 20px;
  font-weight: 600;
  box-shadow: 0 8px 24px rgba(0,0,0,0.08);
  transition: transform 0.25s ease;
}
.theme-swatch:hover {
  transform: translateY(-4px);
}
.theme-github {
  background: #fff;
  color: #24292e;
  border: 1px solid #e6e9ed;
}
.theme-newsprint {
  background: #f5f2e9;
  color: #4a4031;
}
.theme-night {
  background: #2d3033;
  color: #d8dde0;
}
.theme-pixyll {
  background: #fafafa;
  color: #333;
}
.download-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 24px;
  max-width: 720px;
  margin: 0 auto;
}
.download-card {
  padding: 36px 24px;
  text-align: center;
  border: 1px solid #e6e9ed;
  border-radius: 12px;
  transition: all 0.25s ease;
}
.download-card:hover {
  border-color: #2d9cdb;
  transform: translateY(-4px);
  box-shadow: 0 12px 32px rgba(45,156,219,0.15);
}
.os-icon {
  font-size: 44px;
  margin-bottom: 12px;
}
.download-card h3 {
  font-size: 20px;
  margin-bottom: 6px;
}
.download-meta {
  color: #6a7684;
  font-size: 14px;
}
.fbasic-page {
  min-height: 100vh;
  padding: 72px 0 96px;
  background: radial-gradient(circle at top left, rgba(45,156,219,0.18), transparent 30%), #0d1625;
  color: #d8f3ff;
}
.fbasic-hero {
  max-width: 820px;
  margin: 0 auto 36px;
  text-align: center;
}
.fbasic-hero h1 {
  font-size: 42px;
  margin: 8px 0 14px;
  color: #fff;
}
.fbasic-hero p {
  color: #b9d6e8;
  font-size: 17px;
}
.fbasic-hero code {
  color: var(--fbasic-fg, #7cff9b);
  background: rgba(0,0,0,0.28);
  padding: 2px 6px;
  border-radius: 5px;
}
.fbasic-kicker {
  color: #b9d6e8 !important;
  letter-spacing: 0.16em;
  text-transform: uppercase;
  font-size: 13px !important;
  font-weight: 700;
}
.fbasic-mode-tabs {
  display: flex;
  justify-content: center;
  gap: 14px;
  margin: 0 auto 28px;
  flex-wrap: wrap;
}
.fbasic-mode-tab {
  border: 1px solid var(--fbasic-border, rgba(124,255,155,0.28));
  background: rgba(255,255,255,0.04);
  color: var(--fbasic-muted, #d8f3ff);
  padding: 12px 22px;
  border-radius: 999px;
  cursor: pointer;
  font-size: 15px;
  font-weight: 700;
  transition: all 0.2s ease;
}
.fbasic-mode-tab.active,
.fbasic-mode-tab:hover {
  background: var(--fbasic-fg, #7cff9b);
  color: #06100a;
  box-shadow: 0 10px 28px var(--fbasic-focus, rgba(124,255,155,0.2));
}
.fbasic-mode-panel[hidden] {
  display: none;
}
.fbasic-workbench {
  display: grid;
  grid-template-columns: 1.1fr 0.9fr;
  gap: 24px;
}
.fbasic-editor-panel,
.fbasic-screen-panel,
.fbasic-console-panel,
.fbasic-help {
  background: rgba(5,12,22,0.86);
  border: 1px solid var(--fbasic-border, rgba(124,255,155,0.2));
  border-radius: 16px;
  box-shadow: 0 22px 60px rgba(0,0,0,0.28);
  overflow: hidden;
}
.fbasic-panel-head {
  display: flex;
  justify-content: space-between;
  gap: 16px;
  align-items: baseline;
  padding: 18px 20px;
  border-bottom: 1px solid var(--fbasic-border-soft, rgba(124,255,155,0.16));
}
.fbasic-panel-head h2 {
  color: var(--fbasic-fg, #fff);
  font-size: 18px;
}
.fbasic-panel-head span {
  color: var(--fbasic-muted, #86a6b8);
  font-size: 13px;
}
#fbasic-code {
  width: 100%;
  min-height: 420px;
  resize: vertical;
  display: block;
  border: 0;
  outline: none;
  padding: 20px;
  color: var(--fbasic-fg, #e6fff0);
  background: var(--fbasic-bg, #08111f);
  font: 15px/1.55 var(--fbasic-font, 'SF Mono', Monaco, Consolas, monospace);
}
.fbasic-actions {
  display: flex;
  gap: 12px;
  flex-wrap: wrap;
  padding: 16px 20px;
  border-top: 1px solid rgba(124,255,155,0.16);
}
.fbasic-actions .btn:not(.btn-primary) {
  color: #d8f3ff;
  border-color: rgba(216,243,255,0.28);
  background: rgba(255,255,255,0.04);
}
.fbasic-actions .btn:not(.btn-primary):hover {
  border-color: #7cff9b;
  color: #7cff9b;
}
.fbasic-screen {
  min-height: 438px;
  max-height: 438px;
  overflow: auto;
  padding: 22px;
  white-space: pre-wrap;
  color: var(--fbasic-fg, #7cff9b);
  background: var(--fbasic-bg, #020804);
  text-shadow: 0 0 8px var(--fbasic-glow, rgba(124,255,155,0.36));
  font: 16px/1.55 var(--fbasic-font, 'SF Mono', Monaco, Consolas, monospace);
}
.fbasic-command-line {
  display: grid;
  grid-template-columns: auto 1fr auto;
  gap: 10px;
  align-items: center;
  padding: 14px 16px;
  background: #06100a;
  border-top: 1px solid rgba(124,255,155,0.18);
}
.fbasic-prompt {
  color: var(--fbasic-fg, #7cff9b);
  font: 700 18px/1 var(--fbasic-font, 'SF Mono', Monaco, Consolas, monospace);
}
#fbasic-command {
  width: 100%;
  border: 1px solid rgba(124,255,155,0.25);
  border-radius: 8px;
  outline: none;
  padding: 10px 12px;
  color: var(--fbasic-fg, #e6fff0);
  background: var(--fbasic-bg, #020804);
  font: 15px/1.4 var(--fbasic-font, 'SF Mono', Monaco, Consolas, monospace);
}
#fbasic-command:focus {
  border-color: var(--fbasic-fg, #7cff9b);
  box-shadow: 0 0 0 3px var(--fbasic-focus, rgba(124,255,155,0.1));
}
.fbasic-console-panel {
  max-width: 920px;
  margin: 0 auto;
}
.fbasic-console-output {
  min-height: 520px;
  max-height: 520px;
  overflow: auto;
  padding: 24px;
  white-space: pre-wrap;
  color: var(--fbasic-fg, #7cff9b);
  background: var(--fbasic-bg, #020804);
  text-shadow: 0 0 8px var(--fbasic-glow, rgba(124,255,155,0.36));
  font: 16px/1.55 var(--fbasic-font, 'SF Mono', Monaco, Consolas, monospace);
}
.fbasic-console-input-row {
  display: grid;
  grid-template-columns: auto 1fr;
  gap: 10px;
  align-items: center;
  padding: 14px 16px;
  background: #06100a;
  border-top: 1px solid rgba(124,255,155,0.18);
}
.fbasic-display-controls {
  display: flex;
  justify-content: center;
  gap: 16px;
  flex-wrap: wrap;
  margin: -12px auto 28px;
}
.fbasic-display-controls label {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  color: var(--fbasic-muted, #b9d6e8);
  font-size: 14px;
}
.fbasic-display-controls select {
  border: 1px solid var(--fbasic-border, rgba(124,255,155,0.28));
  border-radius: 8px;
  background: #08111f;
  color: var(--fbasic-fg, #d8f3ff);
  padding: 8px 10px;
  outline: none;
}
#fbasic-console-input {
  width: 100%;
  border: 1px solid rgba(124,255,155,0.25);
  border-radius: 8px;
  outline: none;
  padding: 10px 12px;
  color: var(--fbasic-fg, #e6fff0);
  background: var(--fbasic-bg, #020804);
  font: 15px/1.4 var(--fbasic-font, 'SF Mono', Monaco, Consolas, monospace);
}
#fbasic-console-input:focus {
  border-color: var(--fbasic-fg, #7cff9b);
  box-shadow: 0 0 0 3px var(--fbasic-focus, rgba(124,255,155,0.1));
}
.fbasic-theme-green {
  --fbasic-fg: #7cff9b;
  --fbasic-bg: #020804;
  --fbasic-glow: rgba(124,255,155,0.36);
  --fbasic-focus: rgba(124,255,155,0.1);
  --fbasic-border: rgba(124,255,155,0.28);
  --fbasic-border-soft: rgba(124,255,155,0.16);
  --fbasic-muted: #b9d6e8;
}
.fbasic-theme-amber {
  --fbasic-fg: #ffbf4d;
  --fbasic-bg: #120900;
  --fbasic-glow: rgba(255,191,77,0.42);
  --fbasic-focus: rgba(255,191,77,0.12);
  --fbasic-border: rgba(255,191,77,0.28);
  --fbasic-border-soft: rgba(255,191,77,0.16);
  --fbasic-muted: #f0c980;
}
.fbasic-theme-mono {
  --fbasic-fg: #f2f2f2;
  --fbasic-bg: #050505;
  --fbasic-glow: rgba(255,255,255,0.24);
  --fbasic-focus: rgba(255,255,255,0.12);
  --fbasic-border: rgba(255,255,255,0.28);
  --fbasic-border-soft: rgba(255,255,255,0.16);
  --fbasic-muted: #d6d6d6;
}
.fbasic-font-mono {
  --fbasic-font: 'SF Mono', Monaco, Consolas, monospace;
}
.fbasic-font-pixel {
  --fbasic-font: 'Courier New', monospace;
}
.fbasic-font-crt {
  --fbasic-font: Menlo, Monaco, 'Lucida Console', monospace;
}
.fbasic-help {
  margin-top: 24px;
  padding: 24px;
}
.fbasic-help h2 {
  color: #fff;
  margin-bottom: 18px;
}
.fbasic-help-grid {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 14px;
}
.fbasic-help-grid div {
  padding: 16px;
  border-radius: 12px;
  background: rgba(255,255,255,0.045);
  border: 1px solid rgba(255,255,255,0.08);
}
.fbasic-help-grid code {
  display: inline-block;
  color: var(--fbasic-fg, #7cff9b);
  margin-bottom: 8px;
  font-family: var(--fbasic-font, 'SF Mono', Monaco, Consolas, monospace);
}
.fbasic-help-grid span {
  display: block;
  color: #b9d6e8;
  font-size: 14px;
}
.site-footer {
  background: #2c3e50;
  color: #b3bdc7;
  padding: 60px 0 30px;
}
.footer-inner {
  display: flex;
  justify-content: space-between;
  flex-wrap: wrap;
  gap: 32px;
  padding-bottom: 40px;
  border-bottom: 1px solid rgba(255,255,255,0.1);
}
.footer-logo {
  color: #fff;
  margin-bottom: 12px;
}
.footer-logo .logo-icon {
  color: #2d9cdb;
}
.footer-tagline {
  font-size: 14px;
  color: #8b97a3;
}
.footer-links {
  display: flex;
  gap: 28px;
  flex-wrap: wrap;
}
.footer-links a {
  color: #b3bdc7;
  font-size: 15px;
  transition: color 0.2s;
}
.footer-links a:hover {
  color: #2d9cdb;
}
.footer-bottom {
  padding-top: 24px;
  font-size: 14px;
  color: #8b97a3;
}
.blog-archive {
  background: linear-gradient(180deg, #f3faff 0%, #fff 42%);
}
.post-list {
  display: grid;
  gap: 24px;
}
.post-card {
  padding: 28px 30px;
  border: 1px solid #e6e9ed;
  border-radius: 14px;
  background: #fff;
  transition: all 0.25s ease;
}
.post-card:hover {
  transform: translateY(-4px);
  border-color: #2d9cdb;
  box-shadow: 0 14px 34px rgba(45,156,219,0.16);
}
.post-card-title {
  display: inline-block;
  font-size: 24px;
  font-weight: 700;
  line-height: 1.35;
  margin-bottom: 8px;
  color: #2c3e50;
}
.post-card-title:hover {
  color: #2d9cdb;
}
.post-card-meta {
  font-size: 14px;
  color: #6a7684;
  margin-bottom: 14px;
}
.post-card-excerpt {
  color: #6a7684;
  font-size: 16px;
  margin-bottom: 18px;
}
.post-card-excerpt p {
  margin-bottom: 0;
}
.post-card-link {
  display: inline-flex;
  align-items: center;
  color: #2d9cdb;
  font-size: 15px;
  font-weight: 600;
}
.post-card-link:hover {
  color: #2d8bcc;
}
.post-empty {
  text-align: center;
  color: #6a7684;
}
.post-title {
  font-size: 40px;
  margin-bottom: 12px;
}
.post-content {
  font-size: 17px;
}
.post-content h2 {
  margin: 32px 0 16px;
}
.post-content p {
  margin-bottom: 16px;
}
.post-content ul {
  margin: 0 0 18px 24px;
}
.post-content li {
  margin-bottom: 8px;
}
.post-content a {
  color: #2d9cdb;
}
.post-content a:hover {
  color: #2d8bcc;
}
@media (max-width: 960px) {
  .fbasic-workbench {
    grid-template-columns: 1fr;
  }
  .fbasic-help-grid {
    grid-template-columns: repeat(2, 1fr);
  }
}
@media (max-width: 768px) {
  .site-nav {
    position: fixed;
    top: 64px;
    left: 0;
    right: 0;
    flex-direction: column;
    background: #fff;
    padding: 24px;
    gap: 20px;
    border-bottom: 1px solid #e6e9ed;
    transform: translateY(-150%);
    transition: transform 0.3s ease;
  }
  .site-nav.open {
    transform: translateY(0);
  }
  .nav-toggle {
    display: flex;
  }
  .hero-title {
    font-size: 38px;
  }
  .hero-subtitle {
    font-size: 17px;
  }
  .hero-actions {
    flex-direction: column;
    align-items: center;
  }
  .feature-grid {
    grid-template-columns: 1fr;
  }
  .theme-grid {
    grid-template-columns: repeat(2, 1fr);
  }
  .download-grid {
    grid-template-columns: 1fr;
  }
  .window-body {
    padding: 24px;
  }
  .section-title {
    font-size: 30px;
  }
  .fbasic-page {
    padding: 48px 0 72px;
  }
  .fbasic-hero h1 {
    font-size: 32px;
  }
  .fbasic-help-grid {
    grid-template-columns: 1fr;
  }
}