/* ===== IELTS with Kee — Global Styles ===== */
/* Master Kee 🦄 + Nano Banana 🍌 aesthetic */

:root {
  --purple: #9F44D3;
  --purple-light: #b77ae0;
  --purple-dark: #7a2ea8;
  --pink: #FF2442;
  --pink-light: #ff6b7a;
  --banana: #FFD700;
  --banana-light: #ffe44d;
  --banana-dark: #e6c200;
  --gray-50: #fafafa;
  --gray-100: #f5f5f5;
  --gray-200: #eeeeee;
  --gray-300: #e0e0e0;
  --gray-400: #bdbdbd;
  --gray-500: #9e9e9e;
  --gray-600: #757575;
  --gray-700: #616161;
  --gray-800: #424242;
  --gray-900: #212121;
  --white: #ffffff;
  --shadow-sm: 0 1px 3px rgba(0,0,0,0.08);
  --shadow-md: 0 4px 12px rgba(0,0,0,0.1);
  --shadow-lg: 0 8px 24px rgba(0,0,0,0.12);
  --radius: 12px;
  --radius-sm: 8px;
  --transition: all 0.2s ease;
}

*, *::before, *::after {
  box-sizing: border-box;
  margin: 0;
  padding: 0;
}

html {
  scroll-behavior: smooth;
}

body {
  font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, 'Helvetica Neue', Arial, sans-serif;
  background: var(--gray-50);
  color: var(--gray-900);
  line-height: 1.6;
  min-height: 100vh;
}

a {
  color: var(--purple);
  text-decoration: none;
  transition: var(--transition);
}

a:hover {
  color: var(--purple-dark);
}

/* ===== Navigation Bar ===== */
.site-nav {
  background: var(--white);
  border-bottom: 2px solid var(--gray-200);
  position: sticky;
  top: 0;
  z-index: 1000;
  box-shadow: var(--shadow-sm);
}

.site-nav .nav-inner {
  max-width: 1200px;
  margin: 0 auto;
  padding: 0 20px;
  height: 64px;
  display: flex;
  align-items: center;
  justify-content: space-between;
}

.site-nav .nav-brand {
  display: flex;
  align-items: center;
  gap: 8px;
  font-size: 1.25rem;
  font-weight: 700;
  color: var(--purple);
}

.site-nav .nav-brand .nav-emoji {
  font-size: 1.4rem;
}

.site-nav .nav-links {
  display: flex;
  align-items: center;
  gap: 4px;
  list-style: none;
}

.site-nav .nav-links li a {
  display: flex;
  align-items: center;
  gap: 6px;
  padding: 8px 14px;
  border-radius: var(--radius-sm);
  font-size: 0.9rem;
  font-weight: 500;
  color: var(--gray-700);
  transition: var(--transition);
}

.site-nav .nav-links li a:hover,
.site-nav .nav-links li a.active {
  background: var(--gray-100);
  color: var(--purple);
}

.site-nav .nav-links li a.active {
  font-weight: 600;
}

.nav-toggle {
  display: none;
  background: none;
  border: none;
  font-size: 1.5rem;
  cursor: pointer;
  color: var(--gray-700);
  padding: 4px;
}

/* Mobile nav */
@media (max-width: 768px) {
  .nav-toggle {
    display: block;
  }

  .site-nav .nav-links {
    display: none;
    position: absolute;
    top: 64px;
    left: 0;
    right: 0;
    background: var(--white);
    flex-direction: column;
    padding: 8px 20px 16px;
    border-bottom: 2px solid var(--gray-200);
    box-shadow: var(--shadow-md);
  }

  .site-nav .nav-links.open {
    display: flex;
  }

  .site-nav .nav-links li a {
    padding: 12px 14px;
    width: 100%;
  }

  .mobile-home-link {
    display: block !important;
  }
}

@media (min-width: 769px) {
  .mobile-home-link {
    display: none !important;
  }
}

/* ===== Footer ===== */
.site-footer {
  background: var(--gray-900);
  color: var(--gray-400);
  text-align: center;
  padding: 24px 20px;
  font-size: 0.875rem;
}

.site-footer .footer-brand {
  color: var(--banana);
  font-weight: 600;
}

.site-footer .footer-unicorn {
  color: var(--purple-light);
}

/* ===== Hero Section ===== */
.hero {
  background: linear-gradient(135deg, var(--purple) 0%, #7a2ea8 50%, var(--pink) 100%);
  color: var(--white);
  padding: 80px 20px 60px;
  text-align: center;
  position: relative;
  overflow: hidden;
}

.hero::before {
  content: '';
  position: absolute;
  top: -80px;
  right: -80px;
  width: 300px;
  height: 300px;
  background: rgba(255, 215, 0, 0.1);
  border-radius: 50%;
  pointer-events: none;
}

.hero::after {
  content: '';
  position: absolute;
  bottom: -60px;
  left: -60px;
  width: 200px;
  height: 200px;
  background: rgba(255, 255, 255, 0.05);
  border-radius: 50%;
  pointer-events: none;
}

.hero-content {
  max-width: 800px;
  margin: 0 auto;
  position: relative;
  z-index: 1;
}

.hero-emoji {
  font-size: 4rem;
  margin-bottom: 8px;
  display: block;
}

.hero h1 {
  font-size: 3rem;
  font-weight: 800;
  margin-bottom: 8px;
  letter-spacing: -0.5px;
}

.hero .hero-subtitle {
  font-size: 1.3rem;
  opacity: 0.9;
  margin-bottom: 4px;
}

.hero .hero-tagline {
  font-size: 1.05rem;
  opacity: 0.75;
  max-width: 600px;
  margin: 16px auto 0;
  line-height: 1.7;
}

@media (max-width: 768px) {
  .hero { padding: 60px 20px 40px; }
  .hero h1 { font-size: 2rem; }
  .hero .hero-subtitle { font-size: 1rem; }
  .hero-emoji { font-size: 3rem; }
}

/* ===== Section Containers ===== */
.section {
  max-width: 1200px;
  margin: 0 auto;
  padding: 60px 20px;
}

.section-title {
  text-align: center;
  font-size: 1.75rem;
  font-weight: 700;
  color: var(--gray-900);
  margin-bottom: 8px;
}

.section-subtitle {
  text-align: center;
  color: var(--gray-600);
  font-size: 1rem;
  margin-bottom: 40px;
}

/* ===== Tool Cards Grid ===== */
.tools-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(260px, 1fr));
  gap: 24px;
}

.tool-card {
  background: var(--white);
  border-radius: var(--radius);
  padding: 28px 24px 24px;
  box-shadow: var(--shadow-md);
  border: 1px solid var(--gray-200);
  transition: var(--transition);
  display: flex;
  flex-direction: column;
}

.tool-card:hover {
  transform: translateY(-4px);
  box-shadow: var(--shadow-lg);
  border-color: var(--purple-light);
}

.tool-card .card-icon {
  font-size: 2.5rem;
  margin-bottom: 12px;
}

.tool-card h3 {
  font-size: 1.15rem;
  font-weight: 700;
  color: var(--gray-900);
  margin-bottom: 8px;
}

.tool-card p {
  color: var(--gray-600);
  font-size: 0.9rem;
  line-height: 1.6;
  flex: 1;
  margin-bottom: 16px;
}

.tool-card .card-tags {
  display: flex;
  flex-wrap: wrap;
  gap: 6px;
  margin-bottom: 16px;
}

.tool-card .card-tag {
  font-size: 0.7rem;
  padding: 2px 8px;
  border-radius: 999px;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.3px;
}

.tool-card .card-tag.purple { background: #f3e8ff; color: var(--purple); }
.tool-card .card-tag.pink { background: #fff0f2; color: var(--pink); }
.tool-card .card-tag.banana { background: #fff8e1; color: #b8960f; }
.tool-card .card-tag.blue { background: #e3f2fd; color: #1565c0; }

.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 6px;
  padding: 10px 24px;
  border-radius: var(--radius-sm);
  font-weight: 600;
  font-size: 0.9rem;
  cursor: pointer;
  transition: var(--transition);
  border: none;
  text-decoration: none;
}

.btn-primary {
  background: var(--purple);
  color: var(--white);
}

.btn-primary:hover {
  background: var(--purple-dark);
  color: var(--white);
  transform: translateY(-1px);
  box-shadow: var(--shadow-sm);
}

.btn-banana {
  background: var(--banana);
  color: var(--gray-900);
}

.btn-banana:hover {
  background: var(--banana-dark);
  color: var(--gray-900);
  transform: translateY(-1px);
  box-shadow: var(--shadow-sm);
}

.btn-outline {
  background: transparent;
  color: var(--purple);
  border: 2px solid var(--purple);
}

.btn-outline:hover {
  background: var(--purple);
  color: var(--white);
}

.btn-small {
  padding: 7px 16px;
  font-size: 0.8rem;
}

.btn-block {
  width: 100%;
}

/* ===== Resources Page ===== */
.resources-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
  gap: 20px;
}

.resource-card {
  background: var(--white);
  border-radius: var(--radius);
  padding: 24px;
  box-shadow: var(--shadow-sm);
  border: 1px solid var(--gray-200);
  display: flex;
  align-items: flex-start;
  gap: 16px;
  transition: var(--transition);
}

.resource-card:hover {
  box-shadow: var(--shadow-md);
  border-color: var(--purple-light);
}

.resource-icon {
  font-size: 2rem;
  flex-shrink: 0;
  width: 48px;
  text-align: center;
}

.resource-info {
  flex: 1;
  min-width: 0;
}

.resource-info h3 {
  font-size: 1rem;
  font-weight: 600;
  margin-bottom: 4px;
}

.resource-info p {
  font-size: 0.85rem;
  color: var(--gray-600);
  margin-bottom: 10px;
}

.resource-info .file-info {
  font-size: 0.75rem;
  color: var(--gray-400);
  margin-bottom: 10px;
}

/* ===== Mindmap Page ===== */
.mindmap-container {
  max-width: 1200px;
  margin: 0 auto;
  padding: 20px;
}

.mindmap-canvas-wrap {
  background: var(--white);
  border-radius: var(--radius);
  box-shadow: var(--shadow-md);
  padding: 16px;
  min-height: 600px;
  position: relative;
  overflow: hidden;
}

#mindmap-canvas {
  width: 100%;
  min-height: 600px;
}

.mindmap-controls {
  display: flex;
  gap: 8px;
  margin-bottom: 16px;
  flex-wrap: wrap;
}

.mindmap-controls .btn {
  font-size: 0.8rem;
}

/* ===== Page Toolbar ===== */
.page-toolbar {
  background: var(--gray-100);
  border-bottom: 1px solid var(--gray-200);
  padding: 12px 20px;
}

.page-toolbar-inner {
  max-width: 1200px;
  margin: 0 auto;
  display: flex;
  align-items: center;
  justify-content: space-between;
}

.page-toolbar .back-link {
  display: flex;
  align-items: center;
  gap: 6px;
  font-size: 0.9rem;
  font-weight: 500;
  color: var(--gray-600);
}

.page-toolbar .back-link:hover {
  color: var(--purple);
}

/* ===== Page Title Bar ===== */
.page-title-bar {
  background: linear-gradient(135deg, var(--purple) 0%, var(--pink-light) 100%);
  color: var(--white);
  padding: 40px 20px;
  text-align: center;
}

.page-title-bar h1 {
  font-size: 2rem;
  font-weight: 800;
}

.page-title-bar p {
  opacity: 0.85;
  font-size: 1rem;
  margin-top: 4px;
}

/* ===== Mindmap Tree ===== */
.mindmap-tree {
  position: relative;
}

.mm-root {
  text-align: center;
  margin-bottom: 30px;
}

.mm-root .mm-root-label {
  display: inline-block;
  background: var(--purple);
  color: var(--white);
  padding: 14px 32px;
  border-radius: var(--radius);
  font-size: 1.3rem;
  font-weight: 700;
}

.mm-main-branches {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
  gap: 20px;
  margin-top: 10px;
}

.mm-branch {
  background: var(--white);
  border-radius: var(--radius);
  border: 2px solid var(--gray-200);
  overflow: hidden;
  transition: var(--transition);
}

.mm-branch:hover {
  border-color: var(--purple-light);
  box-shadow: var(--shadow-md);
}

.mm-branch-header {
  background: linear-gradient(135deg, var(--purple-light), var(--purple));
  color: var(--white);
  padding: 12px 16px;
  font-weight: 600;
  font-size: 1rem;
  cursor: pointer;
  display: flex;
  align-items: center;
  justify-content: space-between;
  user-select: none;
}

.mm-branch-header .mm-toggle {
  font-size: 0.8rem;
  transition: transform 0.2s;
}

.mm-branch-header.collapsed .mm-toggle {
  transform: rotate(-90deg);
}

.mm-branch-content {
  padding: 12px 16px;
}

.mm-branch-content.collapsed {
  display: none;
}

.mm-sub-branch {
  margin-bottom: 8px;
}

.mm-sub-title {
  font-weight: 600;
  color: var(--gray-800);
  font-size: 0.9rem;
  margin-bottom: 4px;
  cursor: pointer;
  display: flex;
  align-items: center;
  gap: 6px;
}

.mm-sub-items {
  padding-left: 16px;
  display: flex;
  flex-direction: column;
  gap: 2px;
}

.mm-sub-items.collapsed {
  display: none;
}

.mm-item {
  font-size: 0.82rem;
  color: var(--gray-600);
  padding: 3px 8px;
  border-radius: 4px;
  transition: var(--transition);
  cursor: default;
  line-height: 1.4;
}

.mm-item:hover {
  background: var(--gray-100);
  color: var(--gray-800);
}

.mm-item strong,
.mm-item b {
  color: var(--purple);
}

.mm-sub-branch.depth-3 .mm-item {
  padding-left: 8px;
  border-left: 2px solid var(--banana-light);
  margin-bottom: 1px;
}

.mm-sub-branch.depth-3 .mm-item:first-child {
  margin-top: 4px;
}

.mm-branch.branch-Structure .mm-branch-header { background: linear-gradient(135deg, #7c4dff, #651fff); }
.mm-branch.branch-Grading .mm-branch-header { background: linear-gradient(135deg, var(--pink), #d32f2f); }
.mm-branch.branch-Skills .mm-branch-header { background: linear-gradient(135deg, #00bcd4, #0097a7); }
.mm-branch.branch-Vocab .mm-branch-header { background: linear-gradient(135deg, #ff9800, #f57c00); }
.mm-branch.branch-Discourse .mm-branch-header { background: linear-gradient(135deg, #4caf50, #388e3c); }
.mm-branch.branch-Pronunciation .mm-branch-header { background: linear-gradient(135deg, #e91e63, #c2185b); }
.mm-branch.branch-Question .mm-branch-header { background: linear-gradient(135deg, var(--banana), #f9a825); color: var(--gray-900); }
.mm-branch.branch-Checklists .mm-branch-header { background: linear-gradient(135deg, #9c27b0, #7b1fa2); }

/* PDF icon badge */
.pdf-badge {
  font-size: 0.7rem;
  background: var(--pink);
  color: white;
  padding: 1px 6px;
  border-radius: 4px;
  font-weight: 600;
  margin-left: 6px;
  vertical-align: middle;
}

/* ===== Page-specific tool overrides ===== */

/* Whiteboard tool page needs full height */
body.tool-fullpage .site-nav {
  position: relative;
}

body.tool-fullpage #app {
  min-height: calc(100vh - 64px);
}

/* ===== Back to Home button in page toolbar ===== */
.go-home-btn {
  display: inline-flex;
  align-items: center;
  gap: 4px;
  padding: 6px 14px;
  background: var(--gray-200);
  border-radius: var(--radius-sm);
  font-size: 0.85rem;
  font-weight: 500;
  color: var(--gray-700);
  transition: var(--transition);
  border: none;
  cursor: pointer;
}

.go-home-btn:hover {
  background: var(--gray-300);
  color: var(--gray-900);
}

/* ===== Responsive ===== */
@media (max-width: 768px) {
  .section { padding: 40px 16px; }
  .section-title { font-size: 1.4rem; }
  .tools-grid { grid-template-columns: 1fr; }
  .resources-grid { grid-template-columns: 1fr; }
  .mm-main-branches { grid-template-columns: 1fr; }
  .page-title-bar h1 { font-size: 1.5rem; }
}