/* ============================================
   JavaScript Documentation - Modern UI
   ============================================ */

/* ---------- CSS Variables / Design Tokens ---------- */
:root {
  /* Colors */
  --primary: #f7df1e; /* JavaScript yellow */
  --primary-dark: #e6c800;
  --primary-light: #fff9c4;
  --accent: #4fc3f7; /* Light blue accent */
  --accent-dark: #0288d1;

  /* Sidebar (dark theme) */
  --sidebar-bg: #1a1d29;
  --sidebar-bg-gradient: linear-gradient(180deg, #1a1d29 0%, #232838 100%);
  --sidebar-text: #a0a6b8;
  --sidebar-text-hover: #ffffff;
  --sidebar-border: rgba(255, 255, 255, 0.08);
  --sidebar-active-bg: rgba(247, 223, 30, 0.12);
  --sidebar-active-border: #f7df1e;

  /* Content area */
  --content-bg: #f8f9fc;
  --content-card-bg: #ffffff;
  --text-primary: #1e2433;
  --text-secondary: #5a6274;
  --text-muted: #8a92a6;
  --border-color: #e5e8f0;

  /* Code blocks */
  --code-bg: #1e2433;
  --code-text: #e8eaf0;
  --code-border: #2a3040;
  --code-keyword: #c792ea;
  --code-function: #82aaff;
  --code-string: #c3e88d;
  --code-number: #f78c6c;
  --code-comment: #6b7280;
  --code-builtin: #ffcb6b;
  --code-boolean: #ff5370;

  /* Inline code */
  --inline-code-bg: #eef1f8;
  --inline-code-text: #d63384;
  --inline-code-border: #e2e6f0;

  /* Typography */
  --font-sans:
    "Inter", -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, sans-serif;
  --font-mono: "JetBrains Mono", "Fira Code", "Courier New", monospace;

  /* Spacing */
  --sidebar-width: 290px;
  --content-max-width: 860px;
  --section-gap: 2.5rem;

  /* Effects */
  --shadow-sm:
    0 1px 3px rgba(16, 24, 40, 0.06), 0 1px 2px rgba(16, 24, 40, 0.04);
  --shadow-md:
    0 4px 12px rgba(16, 24, 40, 0.08), 0 2px 4px rgba(16, 24, 40, 0.04);
  --shadow-lg:
    0 12px 32px rgba(16, 24, 40, 0.12), 0 4px 8px rgba(16, 24, 40, 0.06);
  --shadow-primary: 0 4px 14px rgba(247, 223, 30, 0.35);
  --radius-sm: 6px;
  --radius-md: 10px;
  --radius-lg: 16px;
  --radius-xl: 24px;

  /* Transitions */
  --transition-fast: 150ms ease;
  --transition-base: 250ms ease;
  --transition-slow: 400ms cubic-bezier(0.4, 0, 0.2, 1);
}

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

html {
  scroll-behavior: smooth;
  scroll-padding-top: 24px;
}

body {
  font-family: var(--font-sans);
  font-size: 16px;
  line-height: 1.7;
  color: var(--text-primary);
  background-color: var(--content-bg);
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}

::selection {
  background-color: var(--primary);
  color: var(--sidebar-bg);
}

/* ---------- Layout ---------- */
.layout {
  display: flex;
  min-height: 100vh;
}

/* ---------- Sidebar ---------- */
.sidebar {
  width: var(--sidebar-width);
  min-width: var(--sidebar-width);
  height: 100vh;
  position: sticky;
  top: 0;
  background: var(--sidebar-bg-gradient);
  border-right: 1px solid var(--sidebar-border);
  display: flex;
  flex-direction: column;
  overflow-y: auto;
  overflow-x: hidden;
  z-index: 100;
  transition: transform var(--transition-slow);
}

.sidebar::-webkit-scrollbar {
  width: 6px;
}

.sidebar::-webkit-scrollbar-track {
  background: transparent;
}

.sidebar::-webkit-scrollbar-thumb {
  background: rgba(255, 255, 255, 0.15);
  border-radius: 3px;
}

.sidebar::-webkit-scrollbar-thumb:hover {
  background: rgba(255, 255, 255, 0.25);
}

/* Sidebar Header */
.sidebar-header {
  padding: 2rem 1.5rem 1.5rem;
  border-bottom: 1px solid var(--sidebar-border);
  text-align: center;
}

.logo {
  display: inline-flex;
  align-items: center;
  gap: 2px;
  font-family: var(--font-mono);
  font-size: 2rem;
  font-weight: 600;
  margin-bottom: 0.75rem;
  user-select: none;
}

.logo-bracket {
  color: var(--primary);
  animation: pulse-bracket 3s ease-in-out infinite;
}

.logo-bracket:last-child {
  animation-delay: 1.5s;
}

.logo-text {
  color: #ffffff;
  background: linear-gradient(135deg, var(--primary) 0%, var(--accent) 100%);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
  padding: 0 4px;
}

@keyframes pulse-bracket {
  0%,
  100% {
    opacity: 1;
    transform: scale(1);
  }
  50% {
    opacity: 0.6;
    transform: scale(0.9);
  }
}

.sidebar-title {
  color: #ffffff;
  font-size: 1.15rem;
  font-weight: 700;
  letter-spacing: -0.02em;
  margin-bottom: 0.25rem;
}

.sidebar-subtitle {
  color: var(--sidebar-text);
  font-size: 0.8rem;
  font-weight: 500;
  text-transform: uppercase;
  letter-spacing: 0.12em;
}

/* Navigation List */
.nav-list {
  list-style: none;
  padding: 1rem 0;
  flex: 1;
}

.nav-list li {
  margin: 2px 0;
}

.nav-link {
  display: flex;
  align-items: center;
  gap: 0.75rem;
  padding: 0.65rem 1.5rem;
  color: var(--sidebar-text);
  text-decoration: none;
  font-size: 0.92rem;
  font-weight: 500;
  border-left: 3px solid transparent;
  transition: all var(--transition-base);
  position: relative;
}

.nav-link::before {
  content: "";
  width: 6px;
  height: 6px;
  border-radius: 50%;
  background: var(--sidebar-text);
  opacity: 0.4;
  flex-shrink: 0;
  transition: all var(--transition-base);
}

.nav-link:hover {
  color: var(--sidebar-text-hover);
  background: rgba(255, 255, 255, 0.05);
}

.nav-link:hover::before {
  background: var(--primary);
  opacity: 1;
  transform: scale(1.2);
}

.nav-link.active {
  color: var(--primary);
  background: var(--sidebar-active-bg);
  border-left-color: var(--sidebar-active-border);
  font-weight: 600;
}

.nav-link.active::before {
  background: var(--primary);
  opacity: 1;
  box-shadow: 0 0 8px rgba(247, 223, 30, 0.6);
}

/* Sidebar Footer */
.sidebar-footer {
  padding: 1.25rem 1.5rem;
  border-top: 1px solid var(--sidebar-border);
}

.mdn-link {
  display: flex;
  align-items: center;
  gap: 0.75rem;
  padding: 0.75rem 1rem;
  background: rgba(255, 255, 255, 0.06);
  border: 1px solid var(--sidebar-border);
  border-radius: var(--radius-md);
  color: var(--sidebar-text);
  text-decoration: none;
  font-size: 0.85rem;
  font-weight: 500;
  transition: all var(--transition-base);
}

.mdn-link:hover {
  background: rgba(255, 255, 255, 0.1);
  border-color: rgba(247, 223, 30, 0.4);
  color: #ffffff;
  transform: translateY(-1px);
}

.mdn-icon {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 32px;
  height: 32px;
  background: var(--primary);
  color: var(--sidebar-bg);
  font-family: var(--font-mono);
  font-size: 0.7rem;
  font-weight: 700;
  border-radius: var(--radius-sm);
  flex-shrink: 0;
}

/* ---------- Main Content ---------- */
.docs {
  flex: 1;
  min-width: 0;
  padding: 3rem 2.5rem 4rem;
  max-width: calc(var(--sidebar-width) + var(--content-max-width) + 5rem);
  margin: 0 auto;
}

#main-doc {
  max-width: var(--content-max-width);
  margin: 0 auto;
}

/* Hero Section */
.doc-hero {
  padding: 2.5rem 2rem;
  margin-bottom: var(--section-gap);
  background: var(--content-card-bg);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-xl);
  box-shadow: var(--shadow-md);
  position: relative;
  overflow: hidden;
}

.doc-hero::before {
  content: "";
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  height: 4px;
  background: linear-gradient(
    90deg,
    var(--primary) 0%,
    var(--accent) 50%,
    var(--primary) 100%
  );
  background-size: 200% 100%;
  animation: gradient-slide 4s linear infinite;
}

@keyframes gradient-slide {
  0% {
    background-position: 0% 0;
  }
  100% {
    background-position: 200% 0;
  }
}

.doc-hero::after {
  content: "{}";
  position: absolute;
  right: -20px;
  bottom: -40px;
  font-family: var(--font-mono);
  font-size: 10rem;
  font-weight: 700;
  color: rgba(247, 223, 30, 0.06);
  pointer-events: none;
  user-select: none;
}

.hero-badge {
  display: inline-block;
  padding: 0.35rem 0.9rem;
  background: var(--primary-light);
  color: #8a6d00;
  font-size: 0.75rem;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.1em;
  border-radius: 999px;
  margin-bottom: 1rem;
  border: 1px solid rgba(247, 223, 30, 0.4);
}

h1#title {
  font-size: 2.5rem;
  font-weight: 800;
  letter-spacing: -0.03em;
  line-height: 1.2;
  margin-bottom: 0.75rem;
  background: linear-gradient(
    135deg,
    var(--text-primary) 0%,
    var(--accent-dark) 100%
  );
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}

.hero-subtitle {
  color: var(--text-secondary);
  font-size: 1.05rem;
  max-width: 600px;
  line-height: 1.6;
}

/* ---------- Sections ---------- */
.main-section {
  background: var(--content-card-bg);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-lg);
  padding: 2rem 2.25rem;
  margin-bottom: var(--section-gap);
  box-shadow: var(--shadow-sm);
  transition: box-shadow var(--transition-base);
  scroll-margin-top: 24px;
}

.main-section:hover {
  box-shadow: var(--shadow-md);
}

.main-section .title {
  display: flex;
  align-items: center;
  gap: 0.9rem;
  font-size: 1.5rem;
  font-weight: 700;
  letter-spacing: -0.02em;
  color: var(--text-primary);
  margin-bottom: 1.25rem;
  padding-bottom: 0.9rem;
  border-bottom: 2px solid var(--border-color);
  position: relative;
}

.main-section .title::after {
  content: "";
  position: absolute;
  bottom: -2px;
  left: 0;
  width: 60px;
  height: 2px;
  background: var(--primary);
  border-radius: 2px;
}

.section-number {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  min-width: 40px;
  height: 40px;
  padding: 0 8px;
  background: linear-gradient(
    135deg,
    var(--primary) 0%,
    var(--primary-dark) 100%
  );
  color: var(--sidebar-bg);
  font-family: var(--font-mono);
  font-size: 0.85rem;
  font-weight: 700;
  border-radius: var(--radius-md);
  box-shadow: var(--shadow-primary);
  flex-shrink: 0;
}

/* Paragraphs */
.main-section p {
  color: var(--text-secondary);
  font-size: 1rem;
  line-height: 1.8;
  margin-bottom: 1rem;
  text-align: justify;
}

.main-section p:last-child {
  margin-bottom: 0;
}

/* Content Lists */
.content-list {
  list-style: none;
  margin: 1rem 0 1.25rem;
  padding: 0;
}

.content-list > li {
  position: relative;
  padding: 0.75rem 0 0.75rem 1.75rem;
  color: var(--text-secondary);
  font-size: 0.98rem;
  line-height: 1.7;
  border-left: 3px solid var(--border-color);
  margin-left: 0.5rem;
  transition: border-color var(--transition-base);
}

.content-list > li:hover {
  border-left-color: var(--primary);
}

.content-list > li::before {
  content: "\25B8";
  position: absolute;
  left: 0.5rem;
  top: 0.75rem;
  color: var(--primary);
  font-size: 0.9rem;
}

.content-list strong {
  color: var(--text-primary);
  font-weight: 600;
}

.nested-list {
  list-style: none;
  margin: 0.5rem 0 0.5rem 1.5rem;
  padding: 0;
}

.nested-list li {
  position: relative;
  padding: 0.4rem 0 0.4rem 1.5rem;
  color: var(--text-secondary);
  font-size: 0.95rem;
  line-height: 1.7;
}

.nested-list li::before {
  content: "\2022";
  position: absolute;
  left: 0.25rem;
  color: var(--accent);
  font-weight: 700;
}

/* ---------- Inline Code ---------- */
code {
  font-family: var(--font-mono);
  font-size: 0.88em;
  background: var(--inline-code-bg);
  color: var(--inline-code-text);
  padding: 0.15em 0.45em;
  border-radius: var(--radius-sm);
  border: 1px solid var(--inline-code-border);
  white-space: nowrap;
}

/* ---------- Code Blocks ---------- */
.code-block {
  background: var(--code-bg);
  border: 1px solid var(--code-border);
  border-radius: var(--radius-md);
  padding: 1.25rem 1.5rem;
  margin: 1.25rem 0;
  overflow-x: auto;
  position: relative;
  box-shadow: var(--shadow-md);
  font-size: 0.9rem;
  line-height: 1.7;
}

.code-block::before {
  content: "JS";
  position: absolute;
  top: 0.75rem;
  right: 1rem;
  font-family: var(--font-mono);
  font-size: 0.65rem;
  font-weight: 600;
  color: rgba(255, 255, 255, 0.25);
  letter-spacing: 0.1em;
  text-transform: uppercase;
}

.code-block code {
  font-family: var(--font-mono);
  font-size: 0.9rem;
  background: transparent;
  color: var(--code-text);
  padding: 0;
  border: none;
  white-space: pre;
  display: block;
}

/* Syntax highlighting */
.code-block .keyword {
  color: var(--code-keyword);
  font-weight: 600;
}
.code-block .function {
  color: var(--code-function);
}
.code-block .string {
  color: var(--code-string);
}
.code-block .number {
  color: var(--code-number);
}
.code-block .comment {
  color: var(--code-comment);
  font-style: italic;
}
.code-block .builtin {
  color: var(--code-builtin);
}
.code-block .boolean {
  color: var(--code-boolean);
}

/* ---------- KBD ---------- */
kbd {
  display: inline-block;
  padding: 0.2rem 0.5rem;
  font-family: var(--font-mono);
  font-size: 0.8rem;
  font-weight: 600;
  color: var(--text-primary);
  background: var(--content-card-bg);
  border: 1px solid var(--border-color);
  border-bottom-width: 2px;
  border-radius: var(--radius-sm);
  box-shadow: var(--shadow-sm);
}

/* ---------- Inline Links ---------- */
.inline-link {
  color: var(--accent-dark);
  text-decoration: none;
  font-weight: 600;
  border-bottom: 2px solid rgba(2, 136, 209, 0.2);
  transition: all var(--transition-base);
}

.inline-link:hover {
  color: var(--primary-dark);
  border-bottom-color: var(--primary);
}

/* ---------- Footer ---------- */
.footer {
  text-align: center;
  padding: 2rem 0 0;
  margin-top: 1rem;
  border-top: 1px solid var(--border-color);
}

.footer p {
  color: var(--text-muted);
  font-size: 0.9rem;
}

/* ---------- Mobile Menu Toggle ---------- */
.menu-toggle {
  display: none;
  position: fixed;
  top: 1rem;
  left: 1rem;
  z-index: 1200;
  width: 44px;
  height: 44px;
  background: var(--sidebar-bg);
  border: 1px solid var(--sidebar-border);
  border-radius: var(--radius-md);
  cursor: pointer;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  gap: 5px;
  box-shadow: var(--shadow-md);
  transition: all var(--transition-base);
}

.menu-toggle:hover {
  background: #2a3040;
  transform: translateY(-1px);
}

.menu-toggle:focus {
  outline: 2px solid var(--primary);
  outline-offset: 2px;
}

.menu-icon {
  display: block;
  width: 20px;
  height: 2px;
  background: var(--primary);
  border-radius: 2px;
  transition: all var(--transition-base);
}

/* Hamburger to X animation */
.menu-toggle.open .menu-icon:nth-child(1) {
  transform: translateY(7px) rotate(45deg);
}

.menu-toggle.open .menu-icon:nth-child(2) {
  opacity: 0;
}

.menu-toggle.open .menu-icon:nth-child(3) {
  transform: translateY(-7px) rotate(-45deg);
}

/* ---------- Overlay ---------- */
.overlay {
  display: none;
  position: fixed;
  inset: 0;
  background: rgba(16, 24, 40, 0.5);
  opacity: 0;
  visibility: hidden;
  transition:
    opacity var(--transition-base),
    visibility var(--transition-base);
  z-index: 900;
}

.overlay.show {
  opacity: 1;
  visibility: visible;
  pointer-events: auto;
  backdrop-filter: blur(4px);
  -webkit-backdrop-filter: blur(4px);
}

/* ---------- Scroll to Top Button ---------- */
.scroll-top {
  position: fixed;
  bottom: 1.5rem;
  right: 1.5rem;
  width: 44px;
  height: 44px;
  background: var(--sidebar-bg);
  color: var(--primary);
  border: 1px solid var(--sidebar-border);
  border-radius: 50%;
  font-size: 1.2rem;
  cursor: pointer;
  display: none;
  align-items: center;
  justify-content: center;
  box-shadow: var(--shadow-md);
  z-index: 800;
  transition: all var(--transition-base);
}

.scroll-top:hover {
  background: #2a3040;
  transform: translateY(-3px);
  box-shadow: var(--shadow-lg);
}

.scroll-top.show {
  display: flex;
  animation: fade-in-up 0.3s ease;
}

@keyframes fade-in-up {
  from {
    opacity: 0;
    transform: translateY(10px);
  }
  to {
    opacity: 1;
    transform: translateY(0);
  }
}

/* ============================================
   Responsive Design
   ============================================ */

/* Tablet & Mobile: slide-in sidebar */
@media (max-width: 1024px) {
  .menu-toggle {
    display: flex;
  }

  .sidebar {
    position: fixed;
    left: 0;
    top: 0;
    transform: translateX(-100%);
    box-shadow: var(--shadow-lg);
    z-index: 1000;
  }

  .sidebar.open {
    transform: translateX(0);
  }

  .overlay {
    display: block;
  }

  .docs {
    padding: 4.5rem 1.5rem 3rem;
    max-width: 100%;
  }

  body.menu-open {
    overflow: hidden;
  }
}

/* Mobile phone */
@media (max-width: 640px) {
  .docs {
    padding: 4.5rem 1rem 2.5rem;
  }

  .doc-hero {
    padding: 1.75rem 1.25rem;
    border-radius: var(--radius-lg);
  }

  .doc-hero::after {
    font-size: 7rem;
    right: -10px;
    bottom: -30px;
  }

  h1#title {
    font-size: 1.9rem;
  }

  .hero-subtitle {
    font-size: 0.95rem;
  }

  .main-section {
    padding: 1.5rem 1.25rem;
    border-radius: var(--radius-md);
  }

  .main-section .title {
    font-size: 1.25rem;
    flex-wrap: wrap;
    gap: 0.6rem;
  }

  .section-number {
    min-width: 34px;
    height: 34px;
    font-size: 0.75rem;
    padding: 0 6px;
  }

  .code-block {
    padding: 1rem 1rem;
    font-size: 0.8rem;
    margin: 1rem 0;
  }

  .code-block code {
    font-size: 0.8rem;
  }

  .content-list > li {
    font-size: 0.92rem;
    padding: 0.6rem 0 0.6rem 1.5rem;
  }

  .main-section p {
    font-size: 0.95rem;
  }

  .footer {
    padding: 1.5rem 0 0;
  }
}

/* ---------- Scrollbar (content area) ---------- */
::-webkit-scrollbar {
  width: 10px;
  height: 10px;
}

::-webkit-scrollbar-track {
  background: var(--content-bg);
}

::-webkit-scrollbar-thumb {
  background: #c8cdd8;
  border-radius: 5px;
  border: 2px solid var(--content-bg);
}

::-webkit-scrollbar-thumb:hover {
  background: #a8aebd;
}

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