/* ===== CSS VARIABLES / THEMES ===== */
:root {
  --bg: #20232a;
  --bg2: #282c34;
  --bg3: #333742;
  --bg4: #1c1e24;
  --text: #ffffff;
  --text2: #99a1b3;
  --text3: #6d758d;
  --accent: #61dafb;
  --accent2: #a277ff;
  --accent3: #ff6b6b;
  --border: rgba(97, 218, 251, 0.2);
  --card: #282c34;
  --codeBg: #1c1e24;
  --sbBg: #20232a;
  --hdrBg: linear-gradient(135deg, #181a1f, #20232a, #282c34);
}

/* Theme Modal */
dialog#themeModal {
  margin: auto;
  padding: 30px;
  background: color-mix(in srgb, var(--bg2) 90%, transparent);
  backdrop-filter: blur(20px);
  -webkit-backdrop-filter: blur(20px);
  color: var(--text);
  border: 1px solid var(--border);
  border-radius: 20px;
  max-width: 850px;
  width: 92%;
  max-height: 85vh;
  overflow-y: auto;
  box-shadow: 0 25px 50px -12px rgba(0, 0, 0, 0.5);
}

dialog#themeModal[open] {
  animation: modalFadeIn 0.4s cubic-bezier(0.16, 1, 0.3, 1) forwards;
}

@keyframes modalFadeIn {
  from {
    opacity: 0;
    transform: scale(0.96) translateY(20px);
  }

  to {
    opacity: 1;
    transform: scale(1) translateY(0);
  }
}

dialog#themeModal::backdrop {
  background: rgba(0, 0, 0, 0.5);
  backdrop-filter: blur(6px);
  animation: backdropFadeIn 0.4s ease forwards;
}

@keyframes backdropFadeIn {
  from {
    opacity: 0;
  }

  to {
    opacity: 1;
  }
}

.tm-head {
  display: flex;
  justify-content: space-between;
  align-items: center;
  margin-bottom: 24px;
  padding-bottom: 16px;
  border-bottom: 1px solid var(--border);
}

.tm-head h2 {
  font-size: 1.8rem;
  margin: 0;
  font-family: "Plus Jakarta Sans", sans-serif;
  font-weight: 800;
}

.tm-close {
  background: none;
  border: none;
  color: var(--text3);
  font-size: 1.6rem;
  cursor: pointer;
  transition: all 0.2s cubic-bezier(0.4, 0, 0.2, 1);
}

.tm-close:hover {
  color: var(--accent);
  transform: rotate(90deg);
}

.tm-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(140px, 1fr));
  gap: 16px;
  margin-bottom: 30px;
}

.theme-card {
  background: color-mix(in srgb, var(--bg3) 50%, transparent);
  border: 2px solid var(--border);
  border-radius: 14px;
  padding: 16px;
  text-align: center;
  cursor: pointer;
  transition: all 0.3s cubic-bezier(0.16, 1, 0.3, 1);
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 10px;
  backdrop-filter: blur(10px);
}

.theme-card:hover,
.theme-card.active {
  border-color: var(--accent);
  transform: translateY(-4px);
  box-shadow: 0 10px 25px -5px
    color-mix(in srgb, var(--accent) 30%, transparent);
  background: var(--bg3);
}

.theme-card .tc-colors {
  display: flex;
  gap: 0;
  width: 100%;
  height: 12px;
  border-radius: 6px;
  overflow: hidden;
  box-shadow: inset 0 1px 3px rgba(0, 0, 0, 0.2);
}

.theme-card .tc-colors span {
  flex: 1;
}

.theme-card .tc-name {
  font-size: 0.85rem;
  font-weight: 700;
  color: var(--text2);
  font-family: "Plus Jakarta Sans", sans-serif;
}

/* Custom Theme Builder */
.custom-theme-box {
  background: linear-gradient(145deg, var(--bg3), var(--bg4));
  border: 1px solid var(--border);
  padding: 24px;
  border-radius: 16px;
  box-shadow: inset 0 2px 10px rgba(0, 0, 0, 0.1);
}

.custom-theme-box h3 {
  margin-top: 0;
  color: var(--accent);
  font-size: 1.3rem;
  font-family: "Plus Jakarta Sans", sans-serif;
  font-weight: 800;
}

.ct-grid {
  display: flex;
  flex-wrap: wrap;
  gap: 20px;
  margin-top: 16px;
  align-items: center;
}

.ct-item {
  display: flex;
  flex-direction: column;
  gap: 8px;
  font-size: 0.85rem;
  color: var(--text2);
  font-weight: 500;
  font-family: "Plus Jakarta Sans", sans-serif;
}

.ct-item input[type="color"] {
  width: 48px;
  height: 48px;
  padding: 0;
  border: none;
  border-radius: 12px;
  cursor: pointer;
  background: none;
  transition: transform 0.2s;
}

.ct-item input[type="color"]:hover {
  transform: scale(1.1);
}

.ct-item input[type="color"]::-webkit-color-swatch-wrapper {
  padding: 0;
}

.ct-item input[type="color"]::-webkit-color-swatch {
  border: 2px solid var(--border);
  border-radius: 10px;
  box-shadow: 0 2px 8px rgba(0, 0, 0, 0.2);
}

.save-ct-btn {
  padding: 12px 24px;
  background: linear-gradient(135deg, var(--accent), var(--accent2));
  color: #fff;
  border: none;
  border-radius: 10px;
  font-weight: 700;
  cursor: pointer;
  font-family: "Plus Jakarta Sans", sans-serif;
  font-size: 0.95rem;
  transition: all 0.3s cubic-bezier(0.16, 1, 0.3, 1);
  box-shadow: 0 4px 15px color-mix(in srgb, var(--accent) 40%, transparent);
}

.save-ct-btn:hover {
  transform: translateY(-2px);
  box-shadow: 0 8px 25px color-mix(in srgb, var(--accent) 60%, transparent);
}

.theme-gallery-btn {
  width: 100%;
  padding: 12px;
  background: color-mix(in srgb, var(--bg3) 50%, transparent);
  border: 1px solid var(--border);
  border-radius: 10px;
  color: var(--text);
  cursor: pointer;
  font-family: "Plus Jakarta Sans", sans-serif;
  font-weight: 700;
  text-align: center;
  transition: all 0.3s;
}

.theme-gallery-btn:hover {
  background: var(--accent);
  color: #fff;
  border-color: var(--accent);
  transform: translateY(-2px);
  box-shadow: 0 4px 15px color-mix(in srgb, var(--accent) 40%, transparent);
}

/* Skip link for keyboard accessibility */
.skip-link {
  position: absolute;
  top: -100%;
  left: 16px;
  background: var(--accent);
  color: #fff;
  padding: 12px 24px;
  border-radius: 0 0 8px 8px;
  font-weight: 700;
  font-family: "Plus Jakarta Sans", sans-serif;
  z-index: 10000;
  transition: top 0.3s ease;
  text-decoration: none;
}

.skip-link:focus {
  top: 0;
}

/* Visually hidden (for screen readers only) */
.visually-hidden {
  position: absolute;
  width: 1px;
  height: 1px;
  padding: 0;
  margin: -1px;
  overflow: hidden;
  clip: rect(0, 0, 0, 0);
  white-space: nowrap;
  border: 0;
}

/* Notification banner (replaces blocking alerts) */
.notification-banner {
  position: fixed;
  bottom: 20px;
  left: 50%;
  transform: translateX(-50%) translateY(120%);
  background: linear-gradient(135deg, var(--bg2), var(--bg3));
  border: 1px solid var(--border);
  color: var(--text);
  padding: 16px 24px;
  border-radius: 16px;
  z-index: 10001;
  max-width: 500px;
  width: 90%;
  box-shadow: 0 20px 50px rgba(0, 0, 0, 0.4);
  backdrop-filter: blur(16px);
  font-family: "Plus Jakarta Sans", sans-serif;
  transition: transform 0.5s cubic-bezier(0.16, 1, 0.3, 1);
  display: flex;
  align-items: center;
  gap: 12px;
}

.notification-banner.show {
  transform: translateX(-50%) translateY(0);
}

.notification-banner .nb-text {
  flex: 1;
  font-size: 0.9rem;
  line-height: 1.5;
}

.notification-banner .nb-close {
  background: var(--accent);
  color: #fff;
  border: none;
  border-radius: 8px;
  padding: 8px 16px;
  cursor: pointer;
  font-weight: 700;
  font-family: "Plus Jakarta Sans", sans-serif;
  white-space: nowrap;
  transition: all 0.2s;
}

.notification-banner .nb-close:hover {
  background: var(--accent2);
  transform: translateY(-1px);
}

/* Focus visible for better keyboard navigation */
:focus-visible {
  outline: 2px solid var(--accent);
  outline-offset: 2px;
}

/* Prefers 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;
  }
}

* {
  box-sizing: border-box;
  margin: 0;
  padding: 0;
  -webkit-tap-highlight-color: transparent;
}

html {
  scroll-behavior: smooth;
  -webkit-text-size-adjust: 100%;
  text-size-adjust: 100%;
  scroll-padding-top: 20px;
}

body {
  font-family:
    "Inter",
    -apple-system,
    BlinkMacSystemFont,
    "Segoe UI",
    Roboto,
    "Helvetica Neue",
    Arial,
    sans-serif;
  background: var(--bg);
  color: var(--text);
  line-height: 1.8;
  transition:
    background 0.5s ease,
    color 0.5s ease;
  overflow-x: hidden;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
  /* Safe area padding for notched devices (iPhone X+, etc.) */
  padding-left: env(safe-area-inset-left);
  padding-right: env(safe-area-inset-right);
  padding-bottom: env(safe-area-inset-bottom);
}

::selection {
  background: var(--accent);
  color: #fff;
}

::-webkit-scrollbar {
  width: 10px;
  height: 10px;
}

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

::-webkit-scrollbar-thumb {
  background: var(--border);
  border-radius: 10px;
  border: 2px solid var(--bg);
}

::-webkit-scrollbar-thumb:hover {
  background: var(--accent3);
}

/* Progress Bar */
#progress-bar {
  position: fixed;
  top: 0;
  left: 0;
  height: 4px;
  background: linear-gradient(
    90deg,
    var(--accent),
    var(--accent2),
    var(--accent3)
  );
  z-index: 9999;
  width: 0;
  transition: width 0.2s ease;
  box-shadow: 0 0 10px var(--accent);
}

/* Sidebar */
#sidebar {
  position: fixed;
  top: 0;
  left: -320px;
  width: 300px;
  height: 100vh;
  background: color-mix(in srgb, var(--sbBg) 85%, transparent);
  backdrop-filter: blur(16px);
  -webkit-backdrop-filter: blur(16px);
  border-right: 1px solid var(--border);
  z-index: 1000;
  transition: left 0.4s cubic-bezier(0.16, 1, 0.3, 1);
  display: flex;
  flex-direction: column;
  overflow: hidden;
  box-shadow: 20px 0 50px rgba(0, 0, 0, 0.1);
}

#sidebar.open {
  left: 0;
}

#overlay {
  position: fixed;
  inset: 0;
  background: rgba(0, 0, 0, 0.4);
  backdrop-filter: blur(4px);
  -webkit-backdrop-filter: blur(4px);
  z-index: 999;
  opacity: 0;
  pointer-events: none;
  transition: opacity 0.4s ease;
}

#overlay.show {
  opacity: 1;
  pointer-events: auto;
}

.sb-head {
  display: flex;
  align-items: center;
  gap: 12px;
  padding: 24px;
  border-bottom: 1px solid var(--border);
  background: color-mix(in srgb, var(--sbBg) 40%, transparent);
}

.sb-logo {
  width: 40px;
  height: 40px;
  border-radius: 10px;
  border: 2px solid var(--accent);
  padding: 2px;
}

.sb-title {
  font-family: "Plus Jakarta Sans", sans-serif;
  font-weight: 800;
  color: var(--text);
  flex: 1;
  font-size: 1.1rem;
  letter-spacing: -0.5px;
}

.sb-close {
  background: var(--bg3);
  border: 1px solid var(--border);
  color: var(--text2);
  width: 32px;
  height: 32px;
  border-radius: 8px;
  font-size: 1.1rem;
  cursor: pointer;
  display: flex;
  align-items: center;
  justify-content: center;
  transition: all 0.2s;
}

.sb-close:hover {
  background: var(--accent);
  color: #fff;
  transform: scale(1.1) rotate(90deg);
  border-color: var(--accent);
}

#sbSearch {
  margin: 16px;
  padding: 12px 16px;
  background: var(--bg4);
  border: 1px solid var(--border);
  border-radius: 12px;
  color: var(--text);
  font-size: 0.9rem;
  font-family: "Plus Jakarta Sans", sans-serif;
  transition: all 0.3s ease;
  box-shadow: inset 0 2px 4px rgba(0, 0, 0, 0.05);
}

#sbSearch:focus {
  outline: none;
  border-color: var(--accent);
  box-shadow:
    0 0 0 3px color-mix(in srgb, var(--accent) 20%, transparent),
    inset 0 2px 4px rgba(0, 0, 0, 0.05);
}

#sbNav {
  flex: 1;
  overflow-y: auto;
  padding: 8px;
  scrollbar-width: thin;
}

#sbNav a {
  display: block;
  padding: 10px 16px;
  margin-bottom: 4px;
  color: var(--text2);
  text-decoration: none;
  font-size: 0.9rem;
  font-weight: 500;
  transition: all 0.2s ease;
  border-radius: 8px;
  border-left: 4px solid transparent;
}

#sbNav a:hover {
  color: var(--accent);
  background: color-mix(in srgb, var(--accent) 10%, transparent);
  transform: translateX(4px);
}

#sbNav a.active {
  color: var(--accent);
  background: color-mix(in srgb, var(--accent) 15%, transparent);
  border-left-color: var(--accent);
  font-weight: 600;
}

.sb-footer {
  padding: 20px;
  border-top: 1px solid var(--border);
  background: color-mix(in srgb, var(--sbBg) 60%, transparent);
}

.theme-wrap,
.font-wrap {
  margin-bottom: 12px;
}

.theme-wrap span,
.font-wrap span {
  display: block;
  color: var(--text3);
  margin-bottom: 8px;
  font-family: "Plus Jakarta Sans", sans-serif;
  font-size: 0.8rem;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 1px;
}

.font-btns {
  display: flex;
  gap: 8px;
}

.font-btns button {
  flex: 1;
  padding: 8px;
  background: var(--bg4);
  border: 1px solid var(--border);
  border-radius: 8px;
  color: var(--text);
  cursor: pointer;
  font-weight: 700;
  font-family: "Plus Jakarta Sans", sans-serif;
  transition: all 0.2s;
}

.font-btns button:hover {
  background: var(--accent);
  color: #fff;
  border-color: var(--accent);
  transform: translateY(-2px);
}

/* Hamburger */
#sbOpen {
  position: fixed;
  top: 20px;
  left: 20px;
  z-index: 998;
  background: color-mix(in srgb, var(--bg3) 80%, transparent);
  backdrop-filter: blur(8px);
  color: var(--text);
  border: 1px solid var(--border);
  width: 48px;
  height: 48px;
  border-radius: 12px;
  font-size: 1.4rem;
  cursor: pointer;
  box-shadow: 0 4px 15px rgba(0, 0, 0, 0.1);
  transition: all 0.3s cubic-bezier(0.16, 1, 0.3, 1);
  display: flex;
  align-items: center;
  justify-content: center;
}

#sbOpen:hover {
  transform: scale(1.05);
  background: var(--accent);
  color: #fff;
  border-color: var(--accent);
  box-shadow: 0 8px 25px color-mix(in srgb, var(--accent) 40%, transparent);
}

/* Main Wrapper */
#mainWrap {
  transition: margin 0.4s cubic-bezier(0.16, 1, 0.3, 1);
}

header {
  background: var(--hdrBg);
  padding: 24px 20px 16px;
  text-align: center;
  position: relative;
  overflow: hidden;
}

header::before {
  content: "";
  position: absolute;
  inset: 0;
  background: radial-gradient(
    ellipse at 50% 0%,
    color-mix(in srgb, var(--accent2) 20%, transparent),
    transparent 70%
  );
  animation: hGlow 10s ease-in-out infinite alternate;
}

header::after {
  content: "";
  position: absolute;
  bottom: 0;
  left: 0;
  width: 100%;
  height: 3px;
  background: linear-gradient(
    to right,
    #ff0000,
    #ff7300,
    #fffb00,
    #48ff00,
    #00ffd5,
    #002bff,
    #7a00ff,
    #ff00c8,
    #ff0000
  );
  background-size: 200% auto;
  animation: rgbGlow 5s linear infinite;
  box-shadow:
    0 0 20px rgba(255, 255, 255, 0.2),
    0 0 40px var(--accent);
}

@keyframes hGlow {
  to {
    transform: translate(3%, 2%) scale(1.05);
  }
}

.logo-wrap {
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  gap: 24px;
  position: relative;
  z-index: 2;
}

.hdr-logo {
  width: 48px;
  height: 48px;
  border-radius: 12px;
  border: 2px solid transparent;
  background:
    linear-gradient(var(--bg), var(--bg)) padding-box,
    linear-gradient(
        45deg,
        #ff0000,
        #ff7300,
        #fffb00,
        #48ff00,
        #00ffd5,
        #002bff,
        #7a00ff,
        #ff00c8
      )
      border-box;
  background-size: 200% auto;
  animation: rgbGlow 5s linear infinite;
  box-shadow:
    0 0 40px color-mix(in srgb, var(--accent) 40%, transparent),
    inset 0 0 20px rgba(255, 255, 255, 0.05);
  padding: 8px;
}

header h1 {
  font-family: "Plus Jakarta Sans", sans-serif;
  font-size: 4rem;
  font-weight: 800;
  background: linear-gradient(
    to right,
    #ff0000,
    #ff7300,
    #fffb00,
    #48ff00,
    #00ffd5,
    #002bff,
    #7a00ff,
    #ff00c8,
    #ff0000
  );
  background-size: 200% auto;
  background-clip: text;
  background-clip: text;
  background-clip: text;
  -webkit-background-clip: text;
  background-clip: text;
  -webkit-text-fill-color: transparent;
  animation: rgbGlow 5s linear infinite;
  position: relative;
  line-height: 1.2;
  letter-spacing: -1.5px;
  filter: drop-shadow(0 4px 15px rgba(0, 0, 0, 0.3));
}

@keyframes rgbGlow {
  to {
    background-position: 200% center;
  }
}

header p {
  color: var(--text2);
  font-size: 1.2rem;
  margin-top: 12px;
  position: relative;
  font-weight: 500;
  max-width: 600px;
  margin-inline: auto;
}

.hdr-stats {
  display: flex;
  justify-content: center;
  gap: 12px;
  margin-top: 14px;
  position: relative;
  z-index: 2;
  flex-wrap: wrap;
}

.stat {
  text-align: center;
  background: color-mix(in srgb, var(--bg) 40%, transparent);
  backdrop-filter: blur(12px);
  border: 1px solid color-mix(in srgb, var(--border) 50%, transparent);
  padding: 8px 16px;
  border-radius: 12px;
  transition: transform 0.3s;
}

.stat:hover {
  transform: translateY(-4px);
  border-color: var(--accent);
}

.stat-n {
  display: block;
  font-family: "Plus Jakarta Sans", sans-serif;
  font-size: 2.5rem;
  font-weight: 800;
  background: linear-gradient(135deg, var(--accent), var(--accent2));
  background-clip: text;
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  line-height: 1;
}

.stat-l {
  font-size: 0.85rem;
  color: var(--text3);
  text-transform: uppercase;
  letter-spacing: 1.5px;
  font-weight: 700;
  margin-top: 8px;
  display: block;
}

/* Sections */
section {
  max-width: 960px;
  margin: 40px auto;
  background: color-mix(in srgb, var(--card) 95%, transparent);
  border-radius: 24px;
  padding: 48px;
  border: 1px solid var(--border);
  box-shadow:
    0 10px 40px rgba(0, 0, 0, 0.15),
    inset 0 1px 0 rgba(255, 255, 255, 0.05);
  transition: all 0.4s cubic-bezier(0.16, 1, 0.3, 1);
  backdrop-filter: blur(10px);
}

section:hover {
  border-color: var(--accent);
  transform: translateY(-6px) scale(1.01);
  box-shadow:
    0 30px 60px rgba(0, 0, 0, 0.3),
    0 0 30px color-mix(in srgb, var(--accent) 20%, transparent),
    0 0 60px color-mix(in srgb, var(--accent2) 10%, transparent),
    inset 0 1px 0 rgba(255, 255, 255, 0.1);
}

section h2 {
  font-family: "Plus Jakarta Sans", sans-serif;
  font-size: 1.8rem;
  font-weight: 800;
  color: var(--text);
  border-bottom: 2px solid color-mix(in srgb, var(--border) 50%, transparent);
  padding-bottom: 16px;
  margin-bottom: 28px;
  display: flex;
  align-items: center;
  gap: 12px;
  flex-wrap: wrap;
}

.anchor-link {
  color: color-mix(in srgb, var(--text) 30%, transparent);
  text-decoration: none;
  transition:
    color 0.2s,
    opacity 0.2s;
  opacity: 0;
  margin-right: 2px;
}

section h2:hover .anchor-link {
  opacity: 1;
}

.listen-btn {
  background: color-mix(in srgb, var(--accent) 15%, transparent);
  color: var(--accent);
  border: 1px solid color-mix(in srgb, var(--accent) 30%, transparent);
  font-size: 0.85rem;
  font-weight: 600;
  cursor: pointer;
  padding: 4px 10px;
  border-radius: 12px;
  transition: all 0.2s ease;
  margin-left: 12px;
  vertical-align: middle;
  font-family: inherit;
  display: inline-flex;
  align-items: center;
  gap: 4px;
}

.listen-btn:hover {
  background: var(--accent);
  color: #fff;
  transform: translateY(-2px);
  box-shadow: 0 4px 12px color-mix(in srgb, var(--accent) 40%, transparent);
}

.anchor-link:hover {
  color: var(--accent);
}

.tag-badge {
  background: color-mix(in srgb, var(--accent) 15%, transparent);
  color: var(--accent2);
  border: 1px solid color-mix(in srgb, var(--accent) 30%, transparent);
  font-size: 0.75rem;
  padding: 4px 12px;
  border-radius: 20px;
  font-weight: 700;
  letter-spacing: 0.5px;
  font-family: "Plus Jakarta Sans", sans-serif;
}

h3 {
  font-family: "Plus Jakarta Sans", sans-serif;
  color: var(--text);
  margin: 32px 0 16px;
  font-size: 1.3rem;
  font-weight: 700;
  display: flex;
  align-items: center;
  gap: 8px;
}

h3::before {
  content: "";
  display: block;
  width: 6px;
  height: 6px;
  border-radius: 50%;
  background: var(--accent);
}

p,
li {
  color: var(--text2);
  margin-bottom: 12px;
  font-size: 1rem;
}

ul,
ol {
  padding-left: 24px;
  margin-bottom: 16px;
}

li {
  padding-left: 8px;
}

li::marker {
  color: var(--accent);
}

strong {
  color: var(--text);
  font-weight: 600;
}

a {
  color: var(--accent);
  text-decoration: none;
  position: relative;
}

a:hover {
  color: var(--accent2);
}

table.at {
  width: 100%;
  border-collapse: separate;
  border-spacing: 0;
  margin: 20px 0;
  font-size: 0.95rem;
  border-radius: 12px;
  overflow: hidden;
  border: 1px solid var(--border);
}

.at th {
  background: color-mix(in srgb, var(--bg3) 80%, transparent);
  color: var(--text);
  font-family: "Plus Jakarta Sans", sans-serif;
  font-weight: 700;
  text-align: left;
  padding: 14px 16px;
  border-bottom: 1px solid var(--border);
}

.at td {
  padding: 14px 16px;
  border-bottom: 1px solid color-mix(in srgb, var(--border) 50%, transparent);
  color: var(--text2);
  transition: background 0.2s;
}

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

.at tr:hover td {
  background: color-mix(in srgb, var(--bg3) 40%, transparent);
}

code {
  background: var(--bg3);
  color: var(--accent2);
  padding: 3px 8px;
  border-radius: 6px;
  font-size: 0.85em;
  font-family: "Fira Code", monospace;
  border: 1px solid color-mix(in srgb, var(--border) 50%, transparent);
}

.info,
.warn,
.tip {
  border-radius: 12px;
  padding: 16px 20px;
  margin: 20px 0;
  font-size: 0.95rem;
  color: var(--text2);
  display: flex;
  flex-direction: column;
  gap: 8px;
  position: relative;
  overflow: hidden;
}

.info::before,
.warn::before,
.tip::before {
  content: "";
  position: absolute;
  left: 0;
  top: 0;
  bottom: 0;
  width: 4px;
}

.info {
  background: color-mix(in srgb, var(--accent) 5%, var(--bg3));
  border: 1px solid color-mix(in srgb, var(--accent) 20%, transparent);
}

.info::before {
  background: var(--accent);
}

.info strong {
  color: var(--accent);
}

.warn {
  background: color-mix(in srgb, var(--accent3) 5%, var(--bg3));
  border: 1px solid color-mix(in srgb, var(--accent3) 20%, transparent);
}

.warn::before {
  background: var(--accent3);
}

.warn strong {
  color: var(--accent3);
}

.tip {
  background: color-mix(in srgb, var(--accent2) 5%, var(--bg3));
  border: 1px solid color-mix(in srgb, var(--accent2) 20%, transparent);
}

.tip::before {
  background: var(--accent2);
}

.tip strong {
  color: var(--accent2);
}

/* Code blocks */
.cb {
  position: relative;
  margin: 24px 0;
  border-radius: 14px;
  overflow: hidden;
  border: 1px solid var(--border);
  box-shadow: 0 10px 30px rgba(0, 0, 0, 0.2);
}

.cb-h {
  display: flex;
  justify-content: space-between;
  align-items: center;
  background: var(--bg3);
  padding: 12px 16px;
  font-size: 0.85rem;
  color: var(--text3);
  font-family: "Plus Jakarta Sans", sans-serif;
  font-weight: 600;
}

.cb-h::before {
  content: "";
  display: block;
  width: 42px;
  height: 12px;
  background-image:
    radial-gradient(circle at 6px 6px, #ff5f56 6px, transparent 6px),
    radial-gradient(circle at 22px 6px, #ffbd2e 6px, transparent 6px),
    radial-gradient(circle at 38px 6px, #27c93f 6px, transparent 6px);
  background-repeat: no-repeat;
}

.cp-btn {
  background: color-mix(in srgb, var(--bg4) 50%, transparent);
  color: var(--text2);
  border: 1px solid var(--border);
  padding: 6px 14px;
  border-radius: 8px;
  cursor: pointer;
  font-size: 0.8rem;
  font-weight: 600;
  transition: all 0.2s cubic-bezier(0.16, 1, 0.3, 1);
  font-family: "Plus Jakarta Sans", sans-serif;
  display: flex;
  align-items: center;
  gap: 6px;
}

.cp-btn:hover {
  background: var(--text);
  color: var(--bg);
  transform: translateY(-1px);
  box-shadow: 0 4px 10px rgba(0, 0, 0, 0.1);
}

.cp-btn.ok {
  background: linear-gradient(135deg, #22c55e, #16a34a);
  color: #fff;
  border-color: transparent;
}

.cb-b {
  background: var(--codeBg);
  padding: 24px;
  overflow-x: auto;
  font-family: "Fira Code", monospace;
  font-size: 0.9rem;
  line-height: 1.6;
  color: var(--text);
  white-space: pre;
}

.cb-b .t {
  color: #ff7eb6;
}

.cb-b .a {
  color: #ffd700;
}

.cb-b .v {
  color: #7ee787;
}

.cb-b .c {
  color: #555580;
  font-style: italic;
}

/* Demo box */
.demo {
  background: linear-gradient(145deg, var(--bg3), var(--bg4));
  border: 1px dashed color-mix(in srgb, var(--accent) 40%, transparent);
  border-radius: 16px;
  padding: 24px;
  margin: 24px 0;
  box-shadow: inset 0 0 20px rgba(0, 0, 0, 0.05);
}

.demo h4 {
  color: var(--accent);
  margin-bottom: 16px;
  font-size: 0.9rem;
  text-transform: uppercase;
  letter-spacing: 1.5px;
  font-family: "Plus Jakarta Sans", sans-serif;
  font-weight: 800;
  display: flex;
  align-items: center;
  gap: 8px;
}

footer {
  text-align: center;
  padding: 60px 20px;
  color: var(--text3);
  font-size: 0.9rem;
  border-top: 1px solid var(--border);
  margin-top: 60px;
  background: var(--bg3);
}

footer a {
  color: var(--accent);
  text-decoration: none;
  font-weight: 600;
  transition: color 0.2s;
}

footer a:hover {
  color: var(--accent2);
}

/* ===== RESPONSIVE — TABLET (iPad, Surface, etc.) ===== */
@media (max-width: 1024px) {
  section {
    margin: 30px 16px;
    padding: 32px 24px;
  }

  header h1 {
    font-size: 2.8rem;
  }

  .hdr-stats {
    gap: 20px;
  }

  .cb-h {
    flex-wrap: wrap;
    gap: 8px;
  }
}

/* ===== RESPONSIVE — TABLET PORTRAIT (iPad mini, 8" tablets) ===== */
@media (max-width: 834px) {
  header h1 {
    font-size: 2.4rem;
  }

  section {
    margin: 24px 14px;
    padding: 28px 20px;
  }

  .hdr-stats {
    gap: 16px;
  }

  .stat {
    padding: 14px 24px;
  }

  table.at {
    display: block;
    overflow-x: auto;
    -webkit-overflow-scrolling: touch;
  }
}

.mobile-nav {
  display: none;
  position: fixed;
  bottom: 0;
  left: 0;
  width: 100%;
  height: 70px;
  background: color-mix(in srgb, var(--bg2) 90%, transparent);
  backdrop-filter: blur(25px);
  -webkit-backdrop-filter: blur(25px);
  border-top: 1px solid var(--border);
  z-index: 10001;
  justify-content: space-around;
  align-items: center;
  padding-bottom: env(safe-area-inset-bottom, 0px);
  box-shadow: 0 -10px 40px rgba(0, 0, 0, 0.3);
}

.nav-item {
  color: var(--text);
  text-decoration: none;
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  font-size: 1.4rem;
  gap: 4px;
  opacity: 0.6;
  transition: 0.3s cubic-bezier(0.4, 0, 0.2, 1);
  width: 20%;
  height: 100%;
}

.nav-item span {
  font-size: 0.65rem;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.5px;
}

.nav-item:active {
  background: rgba(255, 255, 255, 0.05);
  color: var(--accent);
  opacity: 1;
}

@media (max-width: 768px) {
  .mobile-nav {
    display: flex;
  }

  #mainWrap {
    padding-bottom: 90px !important;
  }

  #scrollToTopBtn {
    bottom: 90px !important;
  }

  section {
    margin: 16px 10px;
    padding: 24px 16px;
    border-radius: 16px;
  }

  section:hover {
    transform: none;
    box-shadow:
      0 10px 40px rgba(0, 0, 0, 0.15),
      inset 0 1px 0 rgba(255, 255, 255, 0.05);
  }

  header {
    padding: 60px 16px 30px;
  }

  header h1 {
    font-size: 1.8rem;
    letter-spacing: -0.5px;
    word-break: break-word;
    line-height: 1.2;
  }

  header p {
    font-size: 1rem;
  }

  .hdr-stats {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 12px;
    width: 100%;
    max-width: 500px;
    margin: 0 auto;
  }

  .stat {
    padding: 16px 10px;
    width: 100%;
    max-width: none;
  }

  .stat-n {
    font-size: 1.8rem;
  }

  .stat-l {
    font-size: 0.75rem;
  }

  .hdr-actions {
    display: grid !important;
    grid-template-columns: 1fr 1fr;
    gap: 10px !important;
    justify-content: center;
    margin-top: 24px !important;
  }

  .hdr-actions .action-btn {
    width: 100%;
    padding: 12px 8px !important;
    font-size: 0.85rem !important;
    margin: 0 !important;
  }

  .hdr-actions .action-btn:nth-child(n + 5) {
    grid-column: span 1;
    background: var(--bg4) !important;
    border: 1px solid var(--border) !important;
    padding: 8px !important;
  }

  .tot-day-card {
    padding: 20px 16px !important;
    margin-bottom: 24px !important;
  }

  .tot-day-card h2 {
    font-size: 1.4rem !important;
  }

  .tot-day-card p {
    max-width: 100% !important;
    font-size: 0.9rem !important;
  }

  #sbOpen {
    top: env(safe-area-inset-top, 12px);
    left: env(safe-area-inset-left, 12px);
    width: 48px;
    height: 48px;
    font-size: 1.2rem;
  }

  section h2 {
    font-size: 1.4rem;
  }

  h3 {
    font-size: 1.15rem;
  }

  .cb {
    border-radius: 12px;
  }

  .cb-b {
    padding: 14px;
    font-size: 0.78rem;
    -webkit-overflow-scrolling: touch;
  }

  .cb-h {
    flex-wrap: wrap;
    gap: 6px;
    padding: 10px 12px;
  }

  table.at {
    font-size: 0.85rem;
    display: block;
    overflow-x: auto;
    -webkit-overflow-scrolling: touch;
  }

  .at th,
  .at td {
    padding: 10px 12px;
    white-space: nowrap;
  }

  footer {
    padding: 40px 16px;
    padding-bottom: calc(40px + env(safe-area-inset-bottom, 0px));
  }

  .logo-wrap {
    gap: 16px;
  }

  .hdr-logo {
    width: 64px;
    height: 64px;
    border-radius: 16px;
    padding: 6px;
  }

  /* Minimum touch target 48x48px for all interactive elements (WCAG 2.5.8) */
  button,
  select,
  input[type="search"],
  input[type="text"] {
    min-height: 48px;
  }

  #sbNav a {
    min-height: 48px;
    display: flex;
    align-items: center;
    padding: 12px 16px;
  }

  /* Notification banner adjusts to safe area */
  .notification-banner {
    bottom: calc(16px + env(safe-area-inset-bottom, 0px));
    width: 94%;
    max-width: 420px;
  }

  /* Dialog modals go full-width on mobile */
  dialog#themeModal {
    width: 96%;
    max-height: 80vh;
    padding: 20px;
  }

  .tm-grid {
    grid-template-columns: repeat(auto-fill, minmax(110px, 1fr));
    gap: 10px;
  }

  .demo {
    padding: 16px;
  }

  .info,
  .warn,
  .tip {
    padding: 14px 16px;
    font-size: 0.9rem;
  }
}

/* ===== RESPONSIVE — SMALL PHONES (iPhone SE, Galaxy S series) ===== */
@media (max-width: 400px) {
  header h1 {
    font-size: 1.5rem;
  }

  header {
    padding: 70px 12px 30px;
  }

  header p {
    font-size: 0.9rem;
  }

  section {
    margin: 10px 6px;
    padding: 18px 12px;
    border-radius: 14px;
  }

  section h2 {
    font-size: 1.2rem;
    gap: 8px;
  }

  .tag-badge {
    font-size: 0.65rem;
    padding: 3px 8px;
  }

  .cb-h {
    flex-wrap: wrap;
    gap: 6px;
    font-size: 0.78rem;
  }

  .cp-btn {
    padding: 6px 10px;
    font-size: 0.75rem;
  }

  .stat-n {
    font-size: 1.8rem;
  }

  .stat-l {
    font-size: 0.75rem;
  }

  code {
    font-size: 0.8em;
    padding: 2px 5px;
  }
}

/* ===== RESPONSIVE — VERY SMALL PHONES (iPhone 5/SE 1st gen, 320px) ===== */
@media (max-width: 340px) {
  header h1 {
    font-size: 1.3rem;
  }

  section {
    margin: 8px 4px;
    padding: 16px 10px;
  }

  .hdr-logo {
    width: 48px;
    height: 48px;
  }
}

/* ===== RESPONSIVE — TABLET LANDSCAPE (iPad landscape, laptop touchscreens) ===== */
@media (min-width: 769px) and (max-width: 1024px) and (orientation: landscape) {
  header {
    padding: 60px 24px 40px;
  }

  .hdr-stats {
    flex-direction: row;
    gap: 16px;
  }

  section {
    max-width: 900px;
  }
}

/* ===== RESPONSIVE — LARGE DESKTOP (1440p+, 4K monitors) ===== */
@media (min-width: 1400px) {
  section {
    max-width: 1080px;
  }

  header h1 {
    font-size: 4rem;
  }
}

/* ===== iOS SAFARI SPECIFIC FIXES ===== */
@supports (-webkit-touch-callout: none) {
  /* Fix iOS Safari 100vh issue */
  #sidebar {
    height: -webkit-fill-available;
  }

  /* Smoother momentum scrolling in sidebar */
  #sbNav {
    -webkit-overflow-scrolling: touch;
  }

  /* Fix position:fixed on iOS with virtual keyboard */
  #scrollToTopBtn {
    position: fixed;
    transform: translateZ(0);
  }
}

/* ===== HIGH DPI / RETINA DISPLAYS ===== */
@media (-webkit-min-device-pixel-ratio: 2), (min-resolution: 192dpi) {
  .cb {
    border-width: 0.5px;
  }

  section {
    border-width: 0.5px;
  }
}

/* ===== HOVER CAPABLE DEVICES ONLY ===== */
@media (hover: hover) and (pointer: fine) {
  .stat:hover {
    transform: translateY(-5px);
    background: var(--bg3);
    box-shadow: 0 15px 30px rgba(0, 0, 0, 0.3);
  }

  /* Highlighted Favorite Button */
  .fav-btn {
    background: rgba(255, 255, 255, 0.05) !important;
    border: 1px solid var(--border) !important;
    border-radius: 50%;
    width: 38px;
    height: 38px;
    display: inline-flex;
    align-items: center;
    justify-content: center;
    font-size: 1.1rem !important;
    transition: all 0.3s cubic-bezier(0.175, 0.885, 0.32, 1.275) !important;
    color: var(--text2);
    vertical-align: middle;
  }

  .fav-btn:hover {
    background: var(--bg4) !important;
    transform: scale(1.1) rotate(5deg);
    color: #ff4757;
    border-color: #ff4757;
  }

  .fav-btn.active {
    background: rgba(255, 71, 87, 0.1) !important;
    border-color: #ff4757 !important;
    color: #ff4757 !important;
    box-shadow: 0 0 15px rgba(255, 71, 87, 0.3);
    animation: heartBeat 0.4s ease-out;
  }

  @keyframes heartBeat {
    0% {
      transform: scale(1);
    }

    50% {
      transform: scale(1.3);
    }

    100% {
      transform: scale(1);
    }
  }

  section:hover {
    transform: translateY(-4px);
    box-shadow:
      0 20px 50px rgba(0, 0, 0, 0.2),
      0 0 0 1px color-mix(in srgb, var(--accent) 20%, transparent);
  }

  #sbNav a:hover {
    transform: translateX(4px);
  }
}

/* ===== TOUCH DEVICES (no hover support) ===== */
@media (hover: none) {
  section:hover {
    transform: none;
  }

  #sbNav a:hover {
    transform: none;
  }

  .stat:hover {
    transform: none;
  }

  #scrollToTopBtn:hover {
    transform: translateY(0);
  }
}

/* ===== PRINT STYLES ===== */
@media print {
  #sidebar,
  #overlay,
  #scrollToTopBtn,
  #sbOpen,
  #progress-bar,
  .notification-banner,
  .cp-btn,
  .theme-gallery-btn,
  dialog,
  .skip-link {
    display: none !important;
  }

  body {
    background: #fff;
    color: #000;
    padding: 0;
    -webkit-print-color-adjust: exact;
    print-color-adjust: exact;
  }

  section {
    break-inside: avoid;
    box-shadow: none;
    border: 1px solid #ccc;
    margin: 16px 0;
  }

  header {
    background: #fff !important;
    padding: 20px;
  }

  header h1 {
    -webkit-text-fill-color: #000;
    background: none;
    font-size: 2rem;
  }

  .cb-b {
    white-space: pre-wrap;
    word-break: break-all;
  }

  #sbWrap,
  .hdr-actions,
  .cb-h,
  .listen-btn,
  #scrollToTopBtn,
  dialog,
  .theme-picker {
    display: none !important;
  }

  #mainWrap {
    margin-left: 0 !important;
    padding: 0 !important;
  }

  .cb {
    border: 1px solid #ccc;
  }

  .anchor-link {
    display: none !important;
  }
}

/* --- ZEN MODE (FOCUS MODE) --- */
body.zen-mode #sidebar {
  transform: translateX(-100%);
  pointer-events: none;
}

body.zen-mode #mainWrap {
  margin-left: 0 !important;
  max-width: 900px;
  margin: 0 auto;
  transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
}

body.zen-mode #sbOpen,
body.zen-mode .hdr-stats,
body.zen-mode .action-btn:not(#zenBtn) {
  display: none !important;
}

body.zen-mode #zenBtn {
  background: var(--accent) !important;
  color: #fff !important;
  border-color: var(--accent) !important;
}

/* === MASTERY BUTTON === */
.mastery-btn {
  background: color-mix(in srgb, var(--accent) 10%, transparent);
  color: var(--accent);
  border: 1px solid color-mix(in srgb, var(--accent) 30%, transparent);
  font-size: 0.8rem;
  font-weight: 600;
  cursor: pointer;
  padding: 5px 12px;
  border-radius: 10px;
  transition: all 0.3s cubic-bezier(0.16, 1, 0.3, 1);
  font-family: inherit;
  display: inline-flex;
  align-items: center;
  gap: 4px;
}

.mastery-btn:hover {
  background: var(--accent);
  color: #fff;
  transform: translateY(-2px);
  box-shadow: 0 4px 12px color-mix(in srgb, var(--accent) 40%, transparent);
}

.mastery-btn.mastered {
  background: linear-gradient(135deg, #22c55e, #16a34a) !important;
  color: #fff !important;
  border-color: #22c55e !important;
  box-shadow: 0 0 15px rgba(34, 197, 94, 0.3);
}

/* === EXTRA TAB BUTTONS === */
.extra-tab-btn {
  background: transparent;
  border: 1px solid var(--border);
  color: var(--text2);
  padding: 12px;
  border-radius: 12px;
  cursor: pointer;
  font-weight: 600;
  text-align: left;
  transition: all 0.2s;
  font-family: inherit;
}

.extra-tab-btn.active {
  background: var(--accent);
  color: white;
  border-color: var(--accent);
  box-shadow: 0 4px 15px rgba(108, 99, 255, 0.3);
}

.extra-tab-btn:hover:not(.active) {
  background: var(--bg4);
  border-color: var(--accent);
  color: var(--text);
}

/* === CHEAT SHEET GRID === */
.cs-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(200px, 1fr));
  gap: 12px;
}

.cs-item a {
  display: block;
  padding: 14px;
  background: var(--bg3);
  border: 1px solid var(--border);
  border-radius: 12px;
  text-decoration: none;
  color: var(--text);
  transition: all 0.3s cubic-bezier(0.16, 1, 0.3, 1);
  position: relative;
  overflow: hidden;
}

.cs-item a:hover {
  transform: translateY(-4px);
  box-shadow: 0 10px 20px rgba(0, 0, 0, 0.2);
  border-color: var(--accent);
  background: var(--bg4);
}

.cs-item a::after {
  content: "";
  position: absolute;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  background: linear-gradient(
    135deg,
    transparent,
    rgba(255, 255, 255, 0.03),
    transparent
  );
  transform: translateX(-100%);
  transition: transform 0.5s;
}

.cs-item a:hover::after {
  transform: translateX(100%);
}

/* === FLASHCARD === */
.flash-card-container {
  perspective: 1000px;
  cursor: pointer;
  height: 220px;
}

.flash-inner {
  position: relative;
  width: 100%;
  height: 100%;
  transition: transform 0.6s;
  transform-style: preserve-3d;
  text-align: center;
}

.flash-card-container.flipped .flash-inner {
  transform: rotateY(180deg);
}

.flash-front,
.flash-back {
  position: absolute;
  width: 100%;
  height: 100%;
  backface-visibility: hidden;
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  border-radius: 20px;
  padding: 20px;
}

.flash-front {
  background: linear-gradient(135deg, var(--accent), var(--accent2));
  color: white;
  box-shadow: 0 10px 30px rgba(0, 0, 0, 0.2);
}

.flash-back {
  background: var(--bg3);
  color: var(--text);
  transform: rotateY(180deg);
  border: 2px solid var(--accent);
}

/* ===== PRO EDITOR STYLES ===== */
.pg-dialog {
  padding: 0;
  border: none;
  border-radius: 20px;
  background: #1e1e1e;
  color: #ccc;
  width: 96%;
  height: 92vh;
  max-width: 1500px;
  box-shadow: 0 30px 100px rgba(0, 0, 0, 0.7);
  overflow: hidden;
}

.pg-dialog::backdrop {
  background: rgba(0, 0, 0, 0.75);
  backdrop-filter: blur(12px);
}

.pg-wrapper {
  height: 100%;
  display: flex;
  flex-direction: column;
}

.pg-toolbar {
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding: 8px 16px;
  background: #252526;
  border-bottom: 1px solid #3c3c3c;
  flex-wrap: wrap;
  gap: 6px;
}

.pg-toolbar-left,
.pg-toolbar-right {
  display: flex;
  align-items: center;
  gap: 6px;
  flex-wrap: wrap;
}

.pg-toolbar-divider {
  width: 1px;
  height: 22px;
  background: #444;
  margin: 0 4px;
}

.pg-logo {
  font-weight: 800;
  font-size: 1rem;
  color: #fff;
  margin-right: 8px;
  font-family: "Plus Jakarta Sans", sans-serif;
}

.pg-tb {
  background: #333;
  border: 1px solid #444;
  color: #ccc;
  padding: 5px 10px;
  border-radius: 6px;
  cursor: pointer;
  font-size: 0.78rem;
  font-family: inherit;
  transition: all 0.15s;
  white-space: nowrap;
}

.pg-tb:hover {
  background: #4a4a4a;
  color: #fff;
  border-color: #666;
}

.pg-tb:active {
  transform: scale(0.95);
}

.pg-close-btn {
  background: #e53935 !important;
  color: #fff !important;
  border-color: #e53935 !important;
  font-weight: bold;
  font-size: 0.9rem;
  width: 30px;
  height: 30px;
  padding: 0;
  display: flex;
  align-items: center;
  justify-content: center;
  border-radius: 50%;
}

.pg-close-btn:hover {
  background: #ff1744 !important;
}

.pg-select {
  background: #333;
  border: 1px solid #444;
  color: #ccc;
  padding: 5px 10px;
  border-radius: 6px;
  font-size: 0.78rem;
  font-family: inherit;
  cursor: pointer;
  outline: none;
}

.pg-autosave {
  font-size: 0.72rem;
  color: #4caf50;
  font-weight: 600;
  padding: 4px 8px;
  background: rgba(76, 175, 80, 0.1);
  border-radius: 6px;
  transition: all 0.3s;
}

.pg-autosave.unsaved {
  color: #ff9800;
  background: rgba(255, 152, 0, 0.1);
}

.pg-body {
  flex: 1;
  display: grid;
  grid-template-columns: 1fr 1fr;
  overflow: hidden;
}

.pg-body.vertical {
  grid-template-columns: 1fr;
  grid-template-rows: 1fr 1fr;
}

.pg-editor-pane,
.pg-preview-pane {
  display: flex;
  flex-direction: column;
  overflow: hidden;
}

.pg-editor-pane {
  border-right: 2px solid #333;
}

.pg-body.vertical .pg-editor-pane {
  border-right: none;
  border-bottom: 2px solid #333;
}

.pg-pane-header {
  padding: 6px 14px;
  background: #2d2d2d;
  border-bottom: 1px solid #3c3c3c;
  font-size: 0.75rem;
  color: #888;
  text-transform: uppercase;
  letter-spacing: 1.5px;
  font-weight: 700;
  display: flex;
  justify-content: space-between;
  align-items: center;
}

.pg-filename {
  color: #569cd6;
  font-style: italic;
  text-transform: none;
  letter-spacing: 0;
}

.pg-statusbar {
  padding: 4px 14px;
  background: #007acc;
  color: #fff;
  font-size: 0.7rem;
  display: flex;
  gap: 20px;
  font-family: "Fira Code", monospace;
}

.pg-iframe {
  flex: 1;
  width: 100%;
  border: none;
  background: #fff;
}

.pg-console {
  border-top: 1px solid #3c3c3c;
  background: #1a1a1a;
  max-height: 180px;
  display: flex;
  flex-direction: column;
}

.pg-console-header {
  padding: 6px 14px;
  background: #252526;
  font-size: 0.72rem;
  color: #888;
  font-weight: 700;
  display: flex;
  justify-content: space-between;
  align-items: center;
  border-bottom: 1px solid #333;
}

.pg-console-log {
  flex: 1;
  overflow-y: auto;
  padding: 8px 14px;
  font-family: "Fira Code", monospace;
  font-size: 0.78rem;
}

.pg-console-log .log-line {
  padding: 3px 0;
  border-bottom: 1px solid #222;
}

.pg-console-log .log-info {
  color: #9cdcfe;
}

.pg-console-log .log-warn {
  color: #dcdcaa;
}

.pg-console-log .log-error {
  color: #f44747;
}

.pg-console-toggle {
  font-size: 0.7rem !important;
}

.pg-dialog .CodeMirror {
  flex: 1;
  height: auto !important;
  font-family: "Fira Code", monospace !important;
  font-size: 0.9rem;
}

.pg-dialog .CodeMirror-gutters {
  background: #252526;
  border-right: 1px solid #3c3c3c;
}

/* Fullscreen mode */
.pg-dialog.pg-fullscreen {
  width: 100vw !important;
  height: 100vh !important;
  max-width: 100vw !important;
  border-radius: 0 !important;
}

@media (max-width: 900px) {
  .pg-body {
    grid-template-columns: 1fr;
    grid-template-rows: 1fr 1fr;
  }

  .pg-editor-pane {
    border-right: none;
    border-bottom: 2px solid #333;
  }

  .pg-toolbar {
    padding: 6px 10px;
  }

  .pg-tb {
    padding: 4px 8px;
    font-size: 0.72rem;
  }

  .pg-toolbar-divider {
    display: none;
  }
}

/* === REACT EDITOR & CONSOLE SPECIFIC STYLES === */
.editor-panel {
  display: flex;
  flex-direction: column;
  height: 100%;
}
.panel-header {
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding: 10px 20px;
  background: var(--bg-tertiary);
  border-bottom: 1px solid var(--border);
}
.run-btn {
  background: #10b981;
  color: white;
  border: none;
  padding: 8px 15px;
  border-radius: 4px;
  cursor: pointer;
  font-weight: bold;
  display: flex;
  align-items: center;
  gap: 5px;
  transition: background 0.3s;
}
.run-btn:hover {
  background: #059669;
}
.code-section {
  flex: 1;
  display: flex;
  flex-direction: column;
  border-bottom: 2px solid var(--border);
}
.code-header,
.preview-header {
  background: var(--bg-quaternary);
  padding: 5px 15px;
  display: flex;
  justify-content: space-between;
  align-items: center;
  font-size: 0.85rem;
  color: var(--text-muted);
}
.preview-section {
  flex: 1;
  display: flex;
  flex-direction: column;
  background: #1e1e32;
  min-height: 250px;
}
.icon-btn {
  background: none;
  border: none;
  color: var(--text-muted);
  cursor: pointer;
  font-size: 1rem;
  transition: color 0.3s;
}
.icon-btn:hover {
  color: var(--text);
}
.console-output {
  flex: 1;
  padding: 15px;
  overflow-y: auto;
  font-family: "Fira Code", "Courier New", Courier, monospace;
  font-size: 0.9rem;
  line-height: 1.5;
  background: #0f172a;
  color: #e2e8f0;
}
.console-msg {
  margin-bottom: 4px;
  word-break: break-all;
}
.msg-log {
  color: #38bdf8;
}
.msg-error {
  color: #f87171;
  background: rgba(248, 113, 113, 0.1);
  padding: 2px 5px;
  border-left: 2px solid #f87171;
}

/* Override CodeMirror height to fill flex space */
.CodeMirror {
  flex: 1 !important;
  height: auto !important;
}
/* SPLASH SCREEN UI */
#splash-screen {
  position: fixed;
  top: 0;
  left: 0;
  width: 100vw;
  height: 100vh;
  background: var(--bg);
  z-index: 999999;
  display: flex;
  flex-direction: column;
  justify-content: center;
  align-items: center;
  transition:
    opacity 0.8s ease-in-out,
    visibility 0.8s;
}
#splash-screen.hide {
  opacity: 0;
  visibility: hidden;
}
.splash-logo {
  width: 150px;
  height: 150px;
  object-fit: contain;
  margin-bottom: 20px;
  animation: floatSplash 3s ease-in-out infinite;
  filter: drop-shadow(0 0 20px var(--accent));
}
.splash-title {
  font-family: "Plus Jakarta Sans", sans-serif;
  font-size: 2.5rem;
  font-weight: 800;
  background: linear-gradient(90deg, var(--accent), var(--accent2));
  -webkit-background-clip: text;
  background-clip: text;
  -webkit-text-fill-color: transparent;
  animation: pulseText 2s infinite;
}
.splash-subtitle {
  font-family: "Inter", sans-serif;
  color: var(--text2);
  margin-top: 10px;
  letter-spacing: 2px;
  text-transform: uppercase;
}
@keyframes floatSplash {
  0% {
    transform: translateY(0px) rotate(0deg);
  }
  50% {
    transform: translateY(-15px) rotate(3deg);
  }
  100% {
    transform: translateY(0px) rotate(0deg);
  }
}
@keyframes pulseText {
  0%,
  100% {
    opacity: 1;
  }
  50% {
    opacity: 0.7;
  }
}

/* --- MOBILE MENU & SIDEBAR TOGGLE --- */
.mobile-menu-btn {
  display: none;
  background: transparent;
  color: var(--text);
  border: none;
  font-size: 24px;
  cursor: pointer;
  margin-left: 15px;
}

.sb-close {
  display: flex !important;
  background: var(--bg3);
  color: var(--text);
  border: 1px solid var(--border);
  border-radius: 8px;
  width: 32px;
  height: 32px;
  font-size: 1.1rem;
  cursor: pointer;
  align-items: center;
  justify-content: center;
  transition: all 0.2s;
  flex-shrink: 0;
}

.sb-close:hover {
  background: var(--accent);
  color: #fff;
  transform: scale(1.1) rotate(90deg);
  border-color: var(--accent);
}

@keyframes spin { 100% { transform: rotate(360deg); } }

/* ===== NEW INDEX.HTML STYLES ===== */

/* Scroll Progress Bar */
#progress-bar {
  position: fixed;
  top: 0;
  left: 0;
  width: 0%;
  height: 3px;
  background: linear-gradient(90deg, var(--accent), var(--accent2));
  z-index: 10000;
  transition: width 0.1s;
}

/* Skip Link */
.skip-link {
  position: fixed;
  top: -100px;
  left: 16px;
  background: var(--accent);
  color: #fff;
  padding: 12px 24px;
  border-radius: 8px;
  font-weight: bold;
  z-index: 10001;
  transition: top 0.3s;
  text-decoration: none;
}
.skip-link:focus {
  top: 16px;
}

/* Visually Hidden */
.visually-hidden {
  position: absolute !important;
  width: 1px !important;
  height: 1px !important;
  padding: 0 !important;
  margin: -1px !important;
  overflow: hidden !important;
  clip: rect(0, 0, 0, 0) !important;
  white-space: nowrap !important;
  border: 0 !important;
}

/* Sidebar - Enhanced Toggle */
#sidebar {
  position: fixed;
  left: 0;
  top: 0;
  width: 300px;
  height: 100vh;
  background: var(--bg2);
  border-right: 1px solid var(--border);
  z-index: 1000;
  display: flex;
  flex-direction: column;
  transform: translateX(-100%);
  transition: transform 0.3s cubic-bezier(0.4, 0, 0.2, 1);
  overflow-y: auto;
  box-shadow: 4px 0 20px rgba(0,0,0,0.3);
}
#sidebar.open {
  transform: translateX(0);
}

.sb-head {
  display: flex;
  align-items: center;
  gap: 12px;
  padding: 20px 16px;
  border-bottom: 1px solid var(--border);
}
.sb-title {
  font-weight: 800;
  font-size: 1.1rem;
  color: var(--text);
  font-family: 'Plus Jakarta Sans', sans-serif;
  flex: 1;
}

#sbSearch {
  margin: 12px 16px;
  padding: 10px 14px;
  background: var(--bg4);
  border: 1px solid var(--border);
  border-radius: 12px;
  color: var(--text);
  font-family: 'Plus Jakarta Sans', sans-serif;
  outline: none;
  width: calc(100% - 32px);
  transition: border-color 0.3s;
  font-size: 0.9rem;
}
#sbSearch:focus {
  border-color: var(--accent);
}

#sbNav {
  flex: 1;
  overflow-y: auto;
  padding: 4px 0;
}

.sb-footer {
  padding: 16px;
  border-top: 1px solid var(--border);
}

.theme-wrap, .font-wrap {
  display: flex;
  justify-content: space-between;
  align-items: center;
  margin-bottom: 10px;
  font-size: 0.85rem;
  color: var(--text2);
}
.theme-gallery-btn {
  background: var(--bg3);
  border: 1px solid var(--border);
  color: var(--accent);
  padding: 6px 12px;
  border-radius: 8px;
  cursor: pointer;
  font-weight: 600;
  font-family: inherit;
  font-size: 0.8rem;
  transition: 0.2s;
}
.theme-gallery-btn:hover {
  background: var(--accent);
  color: #fff;
}
.font-btns {
  display: flex;
  gap: 6px;
}
.font-btns button {
  background: var(--bg3);
  border: 1px solid var(--border);
  color: var(--text);
  padding: 4px 10px;
  border-radius: 6px;
  cursor: pointer;
  font-weight: bold;
  font-family: inherit;
  transition: 0.2s;
}
.font-btns button:hover {
  background: var(--accent);
  color: #fff;
}

/* Overlay for sidebar */
#overlay {
  position: fixed;
  inset: 0;
  background: rgba(0,0,0,0.5);
  backdrop-filter: blur(4px);
  z-index: 999;
  display: none;
  opacity: 0;
  transition: opacity 0.3s;
}
#overlay.active {
  display: block;
  opacity: 1;
}

/* Main Wrap & Content */
#mainWrap {
  padding: 16px 20px 40px;
  max-width: 1240px;
  margin: 0 auto;
  position: relative;
  box-sizing: border-box;
  width: 100%;
}

#content {
  width: 100%;
  max-width: 1240px;
  margin: 0 auto;
  box-sizing: border-box;
}

/* Open Sidebar Button */
#sbOpen {
  position: fixed;
  top: 16px;
  left: 16px;
  z-index: 998;
  background: var(--bg2);
  color: var(--text);
  border: 1px solid var(--border);
  border-radius: 12px;
  width: 44px;
  height: 44px;
  font-size: 20px;
  cursor: pointer;
  display: flex;
  align-items: center;
  justify-content: center;
  transition: 0.2s;
  box-shadow: 0 4px 12px rgba(0,0,0,0.2);
}
#sbOpen:hover {
  background: var(--accent);
  color: #fff;
}

/* Header */
header {
  text-align: center;
  padding: 24px 20px 16px;
  position: relative;
}

.logo-wrap {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 16px;
  margin-bottom: 12px;
}

header h1 {
  font-size: 2.2rem;
  font-weight: 800;
  font-family: 'Plus Jakarta Sans', sans-serif;
  margin: 0;
  background: linear-gradient(135deg, var(--accent), var(--accent2));
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}

header p {
  color: var(--text2);
  font-size: 1rem;
  margin: 6px 0 0;
  max-width: 600px;
}

/* Header Stats */
.hdr-stats {
  display: flex;
  justify-content: center;
  gap: 10px;
  flex-wrap: wrap;
  margin-top: 12px;
}
.stat {
  background: var(--bg2);
  border: 1px solid var(--border);
  border-radius: 12px;
  padding: 8px 14px;
  text-align: center;
  min-width: 65px;
  transition: 0.2s;
}
.stat:hover {
  transform: translateY(-2px);
  border-color: var(--accent);
}
.stat-n {
  display: block;
  font-size: 1.5rem;
  font-weight: 800;
  color: var(--accent);
  font-family: 'Plus Jakarta Sans', sans-serif;
}
.stat-l {
  font-size: 0.75rem;
  text-transform: uppercase;
  letter-spacing: 1px;
  color: var(--text2);
  margin-top: 2px;
  display: block;
}

/* Header Actions */
.hdr-actions {
  display: flex;
  gap: 10px;
  margin-top: 20px;
  flex-wrap: wrap;
  justify-content: center;
}

/* React Workbench 2-Column Responsive Grid */
.react-workbench-grid {
  display: grid;
  grid-template-columns: minmax(0, 1.1fr) minmax(0, 0.9fr);
  gap: 20px;
  align-items: stretch;
  margin-top: 20px;
}

.react-workbench-grid .editor-section,
.react-workbench-grid .preview-section {
  min-height: 480px;
}

.react-workbench-grid .CodeMirror {
  height: 420px;
}

@media (max-width: 992px) {
  .react-workbench-grid {
    grid-template-columns: 1fr;
  }
  .react-workbench-grid .editor-section,
  .react-workbench-grid .preview-section {
    min-height: auto;
  }
}

/* Cheat Sheet Grid */
.cs-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(250px, 1fr));
  gap: 16px;
}

/* Extra Tab Button */
.extra-tab-btn {
  width: 100%;
  padding: 12px 16px;
  background: var(--bg);
  border: 1px solid var(--border);
  border-radius: 12px;
  color: var(--text2);
  font-weight: 600;
  cursor: pointer;
  transition: 0.2s;
  text-align: left;
  font-family: inherit;
  font-size: 0.9rem;
}
.extra-tab-btn:hover {
  background: var(--bg3);
  color: var(--text);
}
.extra-tab-btn.active {
  background: color-mix(in srgb, var(--accent) 15%, var(--bg));
  border-color: var(--accent);
  color: var(--accent);
}

/* Notification Banner */
.notification-banner {
  position: fixed;
  bottom: -100px;
  left: 50%;
  transform: translateX(-50%);
  max-width: 700px;
  width: 90%;
  background: var(--bg2);
  border: 1px solid var(--border);
  border-radius: 16px;
  padding: 16px 20px;
  display: flex;
  align-items: center;
  gap: 16px;
  z-index: 997;
  box-shadow: 0 10px 40px rgba(0,0,0,0.3);
  transition: bottom 0.5s cubic-bezier(0.16, 1, 0.3, 1);
}
.notification-banner.show {
  bottom: 20px;
}
.nb-text {
  flex: 1;
  color: var(--text);
  font-size: 0.88rem;
  line-height: 1.5;
}
.nb-close {
  background: var(--accent);
  color: #fff;
  border: none;
  padding: 8px 16px;
  border-radius: 8px;
  cursor: pointer;
  font-weight: bold;
  font-family: inherit;
  white-space: nowrap;
  transition: 0.2s;
}
.nb-close:hover {
  opacity: 0.8;
}

/* Zen Mode */
.zen-mode header,
.zen-mode .hdr-stats,
.zen-mode .hdr-actions,
.zen-mode #siteFooter,
.zen-mode .tot-day-card,
.zen-mode .notification-banner,
.zen-mode #readingTracker,
.zen-mode .social-cluster-nav,
.zen-mode .top-donate-btn {
  display: none !important;
}

/* Dialog general */
dialog::backdrop {
  background: rgba(0, 0, 0, 0.6);
  backdrop-filter: blur(6px);
}

dialog[open] {
  animation: modalFadeIn 0.3s ease forwards;
}

/* iframe sandbox */
.pg-iframe {
  width: 100%;
  min-height: 200px;
  border: none;
  background: transparent;
}

/* Print Styles */
@media print {
  #sidebar, #overlay, #sbOpen, .notification-banner, #readingTracker,
  #scrollToTopBtn, .top-donate-btn, .donate-overlay, .social-cluster-nav,
  .hdr-actions button, #siteFooter { display: none !important; }
  body { background: #fff !important; color: #000 !important; }
  header h1 { -webkit-text-fill-color: #000; }
  .stat { border-color: #ccc; }
}

/* Mobile Responsive */
@media (max-width: 768px) {
  #mainWrap {
    padding: 16px;
  }
  header {
    padding: 70px 16px 20px;
  }
  header h1 {
    font-size: 1.6rem;
  }
  .logo-wrap {
    flex-direction: column;
    gap: 12px;
  }
  .hdr-stats {
    gap: 8px;
  }
  .stat {
    padding: 8px 12px;
    min-width: 60px;
  }
  .stat-n {
    font-size: 1.2rem;
  }
  .hdr-actions {
    gap: 6px;
  }
  .hdr-actions button {
    padding: 6px 12px !important;
    font-size: 0.75rem !important;
  }
  .social-cluster-nav {
    display: none !important;
  }
  .cs-grid {
    grid-template-columns: 1fr;
  }
  #masteryCenterModal > div {
    grid-template-columns: 1fr !important;
  }
}

@media (max-width: 480px) {
  header h1 {
    font-size: 1.3rem;
  }
  .hdr-stats {
    gap: 6px;
  }
  .stat {
    padding: 6px 8px;
    min-width: 50px;
    border-radius: 8px;
  }
  .stat-n {
    font-size: 1rem;
  }
  .stat-l {
    font-size: 0.65rem;
  }
}

/* Custom Scrollbar */
::-webkit-scrollbar {
  width: 8px;
}
::-webkit-scrollbar-track {
  background: var(--bg);
}
::-webkit-scrollbar-thumb {
  background: var(--bg3);
  border-radius: 4px;
}
::-webkit-scrollbar-thumb:hover {
  background: var(--accent);
}

/* Optimized styling by Sanskar */