/* ==========================================================================
   WINET EXPLAINS - HTML5 EDITION
   Design System & Split HTML Editor Styling
   ========================================================================== */

:root {
  --bg-dark: #070b14;
  --panel-bg: rgba(15, 22, 38, 0.82);
  --panel-border: rgba(255, 255, 255, 0.12);
  --panel-hover: rgba(255, 255, 255, 0.22);

  --text-main: #f1f5f9;
  --text-muted: #94a3b8;

  --accent-crimson: #ff3b30;
  --accent-cyan: #00f2fe;
  --accent-green: #00ff88;
  --accent-gold: #ffd700;

  --grad-crimson: linear-gradient(135deg, #ff3b30 0%, #ff7675 100%);
  --grad-cyan: linear-gradient(135deg, #00f2fe 0%, #4facfe 100%);
  --grad-green: linear-gradient(135deg, #00ff88 0%, #00b4d8 100%);

  --font-main: 'Outfit', -apple-system, sans-serif;
  --font-mono: 'JetBrains Mono', monospace;

  --header-height: 70px;
  --footer-height: 70px;
  --transition-fast: 0.25s cubic-bezier(0.4, 0, 0.2, 1);
  --transition-smooth: 0.4s cubic-bezier(0.16, 1, 0.3, 1);
}

/* Reset & Global */
* {
  box-sizing: border-box;
  margin: 0;
  padding: 0;
}

html, body {
  width: 100%;
  height: 100%;
  overflow: hidden;
  background-color: var(--bg-dark);
  color: var(--text-main);
  font-family: var(--font-main);
  -webkit-font-smoothing: antialiased;
}

/* Dynamic Canvas Background */
#bg-canvas {
  position: fixed;
  top: 0;
  left: 0;
  width: 100vw;
  height: 100vh;
  z-index: 0;
  pointer-events: none;
  opacity: 0.5;
}

/* Typography & Helpers */
h1, h2, h3, h4 {
  font-weight: 700;
  line-height: 1.2;
}

h2 {
  font-size: 2.2rem;
  margin-bottom: 0.3rem;
}

p {
  color: var(--text-muted);
  line-height: 1.6;
}

.text-gradient-crimson {
  background: var(--grad-crimson);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
}

.text-gradient-cyan {
  background: var(--grad-cyan);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
}

.code-pill {
  font-family: var(--font-mono);
  background: rgba(255, 59, 48, 0.15);
  color: var(--accent-crimson);
  padding: 0.2rem 0.5rem;
  border-radius: 6px;
  font-size: 0.9em;
  border: 1px solid rgba(255, 59, 48, 0.3);
}

.hidden {
  display: none !important;
}

/* Glassmorphism Cards */
.glass-card {
  background: var(--panel-bg);
  backdrop-filter: blur(16px);
  -webkit-backdrop-filter: blur(16px);
  border: 1px solid var(--panel-border);
  border-radius: 16px;
  padding: 1.5rem;
  box-shadow: 0 10px 30px rgba(0, 0, 0, 0.4);
  transition: transform var(--transition-fast), border-color var(--transition-fast);
}

.glass-card:hover {
  border-color: rgba(255, 255, 255, 0.25);
}

/* Header */
.app-header {
  position: absolute;
  top: 0;
  left: 0;
  width: 100%;
  height: var(--header-height);
  padding: 0 2rem;
  display: flex;
  justify-content: space-between;
  align-items: center;
  z-index: 10;
  border-bottom: 1px solid rgba(255, 255, 255, 0.08);
  background: rgba(7, 11, 20, 0.85);
  backdrop-filter: blur(12px);
}

.logo {
  display: flex;
  align-items: center;
  gap: 0.6rem;
  font-size: 1.4rem;
  font-weight: 800;
  letter-spacing: 1px;
}

.logo-icon {
  color: var(--accent-crimson);
}

.logo-text .highlight {
  color: var(--accent-crimson);
}

.badge {
  font-size: 0.65rem;
  padding: 0.25rem 0.6rem;
  border-radius: 20px;
  background: rgba(255, 59, 48, 0.15);
  border: 1px solid var(--accent-crimson);
  color: var(--accent-crimson);
  font-weight: 700;
}

.header-controls {
  display: flex;
  gap: 0.75rem;
}

.icon-btn {
  background: rgba(255, 255, 255, 0.06);
  border: 1px solid var(--panel-border);
  color: var(--text-main);
  padding: 0.4rem 0.8rem;
  border-radius: 10px;
  font-family: var(--font-main);
  font-size: 0.9rem;
  font-weight: 600;
  cursor: pointer;
  display: flex;
  align-items: center;
  gap: 0.4rem;
  transition: all var(--transition-fast);
}

.icon-btn:hover {
  background: rgba(255, 255, 255, 0.15);
  border-color: var(--accent-crimson);
  color: #fff;
  transform: translateY(-1px);
}

/* Deck Container */
.deck-container {
  position: absolute;
  top: var(--header-height);
  bottom: var(--footer-height);
  left: 0;
  width: 100%;
  overflow: hidden;
  z-index: 1;
}

.slide-track {
  display: flex;
  width: 1000%;
  height: 100%;
  transition: transform var(--transition-smooth);
}

.slide {
  width: 100vw;
  height: 100%;
  padding: 2rem 4rem;
  overflow-y: auto;
  display: flex;
  flex-direction: column;
  justify-content: flex-start;
  opacity: 0.3;
  transform: scale(0.96);
  transition: opacity 0.5s ease, transform 0.5s ease;
}

.slide.active {
  opacity: 1;
  transform: scale(1);
}

.slide-content {
  max-width: 1250px;
  width: 100%;
  margin: 0 auto;
}

.hero-badge {
  display: inline-block;
  font-size: 0.75rem;
  font-weight: 800;
  letter-spacing: 1.5px;
  color: var(--accent-crimson);
  margin-bottom: 0.4rem;
}

.hero-title {
  font-size: 2.8rem;
  margin-bottom: 0.4rem;
}

.hero-subtitle {
  font-size: 1.2rem;
  margin-bottom: 1.8rem;
  color: #cbd5e1;
}

.section-desc {
  font-size: 1.1rem;
  margin-bottom: 1.4rem;
}

/* Grid Layouts */
.grid-2col {
  display: grid;
  grid-template-columns: 1fr 1.1fr;
  gap: 1.5rem;
}

.gap-lg {
  gap: 1.75rem;
}

/* Slide 1 Tag Anatomy Diagram */
.tag-anatomy-diagram {
  display: flex;
  align-items: center;
  justify-content: space-between;
  background: rgba(0, 0, 0, 0.35);
  padding: 1rem;
  border-radius: 12px;
  border: 1px solid var(--panel-border);
  margin: 1.2rem 0;
}

.t-part {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 0.2rem;
}

.t-part code {
  font-family: var(--font-mono);
  font-size: 0.85rem;
  font-weight: 700;
  padding: 0.3rem 0.6rem;
  border-radius: 6px;
}

.part-open code { background: rgba(0, 242, 254, 0.2); color: var(--accent-cyan); border: 1px solid var(--accent-cyan); }
.part-content code { background: rgba(0, 255, 136, 0.2); color: var(--accent-green); border: 1px solid var(--accent-green); }
.part-close code { background: rgba(255, 59, 48, 0.2); color: var(--accent-crimson); border: 1px solid var(--accent-crimson); }

.t-part span {
  font-size: 0.7rem;
  color: var(--text-muted);
}

.doc-boilerplate h4 {
  font-size: 0.95rem;
  margin-bottom: 0.4rem;
}

.doc-boilerplate ul {
  list-style: none;
  display: flex;
  flex-direction: column;
  gap: 0.4rem;
  font-size: 0.85rem;
}

.doc-boilerplate code {
  font-family: var(--font-mono);
  color: var(--accent-cyan);
}

/* LIVE SPLIT HTML EDITOR & PREVIEW */
.editor-card {
  display: flex;
  flex-direction: column;
  background: #0a0e19;
  border: 1px solid rgba(255, 59, 48, 0.25);
  box-shadow: 0 0 25px rgba(255, 59, 48, 0.1);
}

.editor-header {
  display: flex;
  justify-content: space-between;
  align-items: center;
  margin-bottom: 0.75rem;
  padding-bottom: 0.5rem;
  border-bottom: 1px solid rgba(255, 255, 255, 0.1);
}

.editor-title {
  font-family: var(--font-mono);
  font-size: 0.85rem;
  font-weight: 700;
  color: var(--accent-crimson);
}

.btn-render {
  background: var(--grad-crimson);
  color: #fff;
  border: none;
  font-family: var(--font-main);
  font-weight: 800;
  font-size: 0.85rem;
  padding: 0.5rem 1.1rem;
  border-radius: 8px;
  cursor: pointer;
  transition: transform var(--transition-fast), filter var(--transition-fast);
}

.btn-render:hover {
  transform: translateY(-2px);
  filter: brightness(1.1);
}

.split-editor-grid {
  display: flex;
  flex-direction: column;
  gap: 0.75rem;
}

.code-editor-box {
  background: #04060c;
  border-radius: 10px;
  border: 1px solid rgba(255, 255, 255, 0.08);
  padding: 0.6rem;
}

.box-label, .preview-label {
  font-family: var(--font-mono);
  font-size: 0.7rem;
  font-weight: 800;
  color: var(--text-muted);
  letter-spacing: 1px;
  margin-bottom: 0.3rem;
}

.code-input {
  width: 100%;
  background: transparent;
  border: none;
  outline: none;
  color: #e2e8f0;
  font-family: var(--font-mono);
  font-size: 0.85rem;
  line-height: 1.5;
  resize: vertical;
}

.preview-output-box {
  background: #020307;
  border-radius: 10px;
  border: 2px solid var(--accent-cyan);
  padding: 0.6rem;
}

.preview-screen {
  background: #111827;
  border-radius: 8px;
  padding: 1rem;
  min-height: 120px;
  max-height: 180px;
  overflow-y: auto;
  color: #f3f4f6;
  font-family: system-ui, sans-serif;
  word-break: break-word;
}

/* Tag Tables */
.tag-table-wrapper {
  margin-top: 1rem;
  overflow-x: auto;
}

.tag-table {
  width: 100%;
  border-collapse: collapse;
  font-size: 0.85rem;
}

.tag-table th, .tag-table td {
  padding: 0.5rem 0.75rem;
  text-align: left;
  border-bottom: 1px solid rgba(255, 255, 255, 0.08);
}

.tag-table th { color: var(--accent-crimson); }
.tag-table code { font-family: var(--font-mono); color: var(--accent-cyan); }

/* Slide 3: Lists */
.list-types-grid {
  display: flex;
  flex-direction: column;
  gap: 0.8rem;
  margin-top: 1rem;
}

.l-card {
  background: rgba(0, 0, 0, 0.3);
  padding: 0.8rem 1rem;
  border-radius: 10px;
  border: 1px solid var(--panel-border);
}

.l-card h4 {
  font-size: 0.95rem;
  margin-bottom: 0.2rem;
  color: var(--accent-crimson);
}

.l-card p {
  font-size: 0.85rem;
  margin-bottom: 0.3rem;
}

.l-card code {
  font-family: var(--font-mono);
  font-size: 0.8rem;
  color: var(--accent-cyan);
}

/* Slide 4: Anchors */
.anchor-rules {
  display: flex;
  flex-direction: column;
  gap: 0.8rem;
  margin-top: 1rem;
}

.a-rule {
  background: rgba(0, 0, 0, 0.3);
  padding: 0.75rem 1rem;
  border-radius: 10px;
  border: 1px solid var(--panel-border);
  font-size: 0.85rem;
}

.a-rule code {
  font-family: var(--font-mono);
  color: var(--accent-cyan);
  display: block;
  margin-bottom: 0.2rem;
}

/* Slide 5: Media Specs */
.media-specs {
  display: flex;
  flex-direction: column;
  gap: 0.8rem;
  margin-top: 1rem;
}

.m-spec {
  background: rgba(0, 0, 0, 0.3);
  padding: 0.8rem 1rem;
  border-radius: 10px;
  border: 1px solid var(--panel-border);
  font-size: 0.85rem;
}

.m-spec code {
  font-family: var(--font-mono);
  color: var(--accent-green);
  display: block;
  margin-bottom: 0.2rem;
}

/* Slide 6: Semantic Layout Diagram */
.semantic-layout-diagram {
  display: flex;
  flex-direction: column;
  gap: 0.4rem;
  margin-top: 1rem;
  font-family: var(--font-mono);
  font-size: 0.75rem;
}

.sem-box {
  background: rgba(0, 242, 254, 0.1);
  border: 1px dashed var(--accent-cyan);
  padding: 0.5rem;
  border-radius: 6px;
  text-align: center;
  color: #a5f3fc;
}

.sem-row {
  display: flex;
  gap: 0.4rem;
}

.sem-main { flex: 2; background: rgba(0, 255, 136, 0.1); border-color: var(--accent-green); color: #6ee7b7; }
.sem-aside { flex: 1; background: rgba(255, 215, 0, 0.1); border-color: var(--accent-gold); color: #fde047; }

.sem-sub {
  margin-top: 0.4rem;
  font-size: 0.65rem;
  opacity: 0.8;
}

/* Slide 7: Form Tags */
.form-tag-list {
  display: flex;
  flex-direction: column;
  gap: 0.6rem;
  margin-top: 1rem;
}

.f-tag {
  display: flex;
  align-items: center;
  gap: 0.8rem;
  background: rgba(0, 0, 0, 0.3);
  padding: 0.6rem 0.8rem;
  border-radius: 8px;
  border: 1px solid var(--panel-border);
  font-size: 0.85rem;
}

.f-tag code {
  font-family: var(--font-mono);
  color: var(--accent-crimson);
  min-width: 140px;
}

/* Slide 9: Graphics Specs */
.graphics-specs {
  display: flex;
  flex-direction: column;
  gap: 0.8rem;
  margin-top: 1rem;
}

.g-spec {
  background: rgba(0, 0, 0, 0.3);
  padding: 0.8rem 1rem;
  border-radius: 10px;
  border: 1px solid var(--panel-border);
  font-size: 0.85rem;
}

.g-spec code {
  font-family: var(--font-mono);
  color: var(--accent-gold);
  display: block;
  margin-bottom: 0.2rem;
}

/* Quiz Card */
.quiz-card {
  display: flex;
  flex-direction: column;
}

.quiz-header {
  display: flex;
  justify-content: space-between;
  align-items: center;
  margin-bottom: 1.2rem;
  font-weight: 700;
}

.score-badge {
  background: rgba(0, 255, 136, 0.2);
  color: var(--accent-green);
  padding: 0.3rem 0.8rem;
  border-radius: 20px;
  border: 1px solid var(--accent-green);
}

.quiz-question {
  font-size: 1.2rem;
  margin-bottom: 1.2rem;
}

.quiz-options {
  display: flex;
  flex-direction: column;
  gap: 0.7rem;
  margin-bottom: 1rem;
}

.quiz-opt-btn {
  background: rgba(0, 0, 0, 0.3);
  border: 1px solid var(--panel-border);
  color: var(--text-main);
  padding: 0.8rem 1rem;
  border-radius: 10px;
  font-family: var(--font-main);
  font-size: 0.95rem;
  text-align: left;
  cursor: pointer;
  transition: all var(--transition-fast);
  display: flex;
  align-items: center;
  gap: 0.8rem;
}

.quiz-opt-btn:hover {
  background: rgba(255, 255, 255, 0.08);
  border-color: var(--accent-crimson);
}

.quiz-opt-btn.correct {
  background: rgba(0, 255, 136, 0.25) !important;
  border-color: var(--accent-green) !important;
  color: #fff;
}

.quiz-opt-btn.wrong {
  background: rgba(255, 59, 48, 0.25) !important;
  border-color: var(--accent-crimson) !important;
  color: #fff;
}

.quiz-feedback {
  background: rgba(255, 255, 255, 0.05);
  padding: 0.8rem;
  border-radius: 8px;
  margin-top: 0.8rem;
  font-size: 0.9rem;
}

/* Presenter Notes */
.teacher-notes {
  margin-top: 1.5rem;
  background: rgba(255, 59, 48, 0.12);
  border: 1px dashed var(--accent-crimson);
  padding: 1rem 1.25rem;
  border-radius: 12px;
  font-size: 0.95rem;
}

.teacher-notes h4 {
  color: var(--accent-crimson);
  margin-bottom: 0.4rem;
}

/* Footer & Navigation */
.app-footer {
  position: absolute;
  bottom: 0;
  left: 0;
  width: 100%;
  height: var(--footer-height);
  padding: 0 2rem;
  display: flex;
  justify-content: space-between;
  align-items: center;
  z-index: 10;
  border-top: 1px solid rgba(255, 255, 255, 0.08);
  background: rgba(7, 11, 20, 0.85);
  backdrop-filter: blur(12px);
}

.nav-btn {
  background: rgba(255, 255, 255, 0.08);
  border: 1px solid var(--panel-border);
  color: var(--text-main);
  padding: 0.6rem 1.2rem;
  border-radius: 8px;
  font-family: var(--font-main);
  font-size: 0.9rem;
  font-weight: 700;
  cursor: pointer;
  transition: all var(--transition-fast);
}

.nav-btn:hover {
  background: rgba(255, 255, 255, 0.18);
}

.nav-btn.primary {
  background: var(--grad-crimson);
  color: #fff;
  border: none;
}

.slide-dots {
  display: flex;
  gap: 0.5rem;
}

.dot-btn {
  width: 10px;
  height: 10px;
  border-radius: 50%;
  background: rgba(255, 255, 255, 0.2);
  border: none;
  cursor: pointer;
  transition: all var(--transition-fast);
}

.dot-btn.active {
  background: var(--accent-crimson);
  box-shadow: 0 0 10px var(--accent-crimson);
  transform: scale(1.3);
}

.slide-counter {
  font-size: 0.9rem;
  font-weight: 600;
  color: var(--text-muted);
}

/* Drawer Modal */
.drawer-overlay {
  position: fixed;
  top: 0;
  left: 0;
  width: 100vw;
  height: 100vh;
  background: rgba(0, 0, 0, 0.75);
  backdrop-filter: blur(8px);
  z-index: 100;
  display: flex;
  align-items: center;
  justify-content: center;
}

.drawer-content {
  width: 90%;
  max-width: 850px;
  max-height: 85vh;
  overflow-y: auto;
}

.drawer-header {
  display: flex;
  justify-content: space-between;
  align-items: center;
  margin-bottom: 1.5rem;
}

.close-btn {
  background: transparent;
  border: none;
  color: var(--text-muted);
  font-size: 1.4rem;
  cursor: pointer;
}

.drawer-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(240px, 1fr));
  gap: 1rem;
}

.drawer-card {
  background: rgba(0, 0, 0, 0.4);
  border: 1px solid var(--panel-border);
  border-radius: 12px;
  padding: 1rem;
  cursor: pointer;
  transition: all var(--transition-fast);
}

.drawer-card:hover {
  border-color: var(--accent-crimson);
  background: rgba(255, 59, 48, 0.1);
  transform: translateY(-2px);
}

.drawer-card .d-num {
  font-size: 0.7rem;
  font-weight: 800;
  color: var(--accent-crimson);
}

.drawer-card h4 {
  font-size: 0.95rem;
  margin-top: 0.3rem;
}

/* Responsive */
@media (max-width: 900px) {
  .grid-2col { grid-template-columns: 1fr; }
  .slide { padding: 1.5rem; }
  .hero-title { font-size: 2.1rem; }
  .btn-label { display: none; }
  .app-header, .app-footer { padding: 0 1rem; }
  .tag-anatomy-diagram { flex-direction: column; gap: 0.6rem; text-align: center; }
}