/* ==========================================================================
   KS-Squared Design System & Master Stylesheet
   Theme: Official Light Theme — Clean White Background with Slate-Teal (#446677) Accents
   ========================================================================== */

@import url('https://fonts.googleapis.com/css2?family=Inter:wght@300;400;500;600;700&family=Outfit:wght@400;500;600;700;800&family=Fira+Code:wght@400;500&display=swap');

:root {
  /* Official KS2 Light Theme Colors */
  --brand-primary: #446677;
  --brand-teal-deep: #2c4452;
  --brand-teal-light: #5b8499;
  --brand-teal-accent: #0f766e;
  --brand-cyan-accent: #0284c7;
  
  --bg-primary: #ffffff;
  --bg-secondary: #f8fafc;
  --bg-card: #ffffff;
  --bg-card-hover: #ffffff;
  --border-color: #e2e8f0;
  --border-glow: rgba(68, 102, 119, 0.35);
  
  --accent-cyan: #0284c7;
  --accent-emerald: #059669;
  --accent-amber: #d97706;
  --accent-purple: #7c3aed;
  
  --text-primary: #0f172a;
  --text-secondary: #475569;
  --text-muted: #64748b;
  
  /* Typography */
  --font-heading: 'Outfit', -apple-system, sans-serif;
  --font-body: 'Inter', -apple-system, sans-serif;
  --font-mono: 'Fira Code', monospace;
  
  /* Layout & Spacing */
  --container-max: 1240px;
  --radius-sm: 8px;
  --radius-md: 14px;
  --radius-lg: 24px;
  
  /* Transitions & Effects */
  --transition-fast: 0.2s cubic-bezier(0.4, 0, 0.2, 1);
  --transition-normal: 0.3s cubic-bezier(0.4, 0, 0.2, 1);
  --shadow-card: 0 4px 20px -2px rgba(68, 102, 119, 0.08), 0 2px 6px -1px rgba(0, 0, 0, 0.04);
  --shadow-glow: 0 12px 35px -5px rgba(68, 102, 119, 0.18);
}

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

html {
  scroll-behavior: smooth;
  font-size: 16px;
}

body {
  background-color: var(--bg-primary);
  color: var(--text-primary);
  font-family: var(--font-body);
  line-height: 1.6;
  overflow-x: hidden;
  -webkit-font-smoothing: antialiased;
}

a {
  color: inherit;
  text-decoration: none;
}

ul {
  list-style: none;
}

img {
  max-width: 100%;
  height: auto;
  display: block;
}

/* Crisp Clean Light Background Grid */
.bg-grid {
  position: fixed;
  top: 0;
  left: 0;
  width: 100vw;
  height: 100vh;
  background-image: 
    linear-gradient(to right, rgba(68, 102, 119, 0.04) 1px, transparent 1px),
    linear-gradient(to bottom, rgba(68, 102, 119, 0.04) 1px, transparent 1px);
  background-size: 50px 50px;
  pointer-events: none;
  z-index: -2;
}

.bg-glow-orb {
  position: fixed;
  width: 700px;
  height: 700px;
  border-radius: 50%;
  background: radial-gradient(circle, rgba(68, 102, 119, 0.08) 0%, rgba(255, 255, 255, 0) 70%);
  top: -150px;
  right: -150px;
  pointer-events: none;
  z-index: -1;
}

/* ==========================================================================
   Layout Containers & Grid
   ========================================================================== */
.container {
  width: 100%;
  max-width: var(--container-max);
  margin: 0 auto;
  padding: 0 1.5rem;
}

.section {
  padding: 6rem 0;
  position: relative;
}

.grid-2 {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 2.5rem;
  align-items: center;
}

.grid-3 {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 2rem;
}

.grid-4 {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 1.5rem;
}

@media (max-width: 992px) {
  .grid-2, .grid-3, .grid-4 {
    grid-template-columns: 1fr;
  }
}

/* ==========================================================================
   Header & Navigation
   ========================================================================== */
.navbar {
  position: fixed;
  top: 0;
  left: 0;
  width: 100%;
  z-index: 1000;
  background: rgba(255, 255, 255, 0.92);
  backdrop-filter: blur(16px);
  border-bottom: 1px solid var(--border-color);
  box-shadow: 0 2px 10px rgba(0, 0, 0, 0.03);
  transition: var(--transition-fast);
}

.nav-container {
  display: flex;
  justify-content: space-between;
  align-items: center;
  height: 85px;
}

.brand-logo {
  display: flex;
  align-items: center;
  gap: 0.85rem;
  font-family: var(--font-heading);
  font-weight: 800;
  font-size: 1.35rem;
  color: var(--brand-primary);
  letter-spacing: -0.5px;
}

.brand-logo img {
  height: 48px;
  width: auto;
  object-fit: contain;
}

.logo-badge {
  background: var(--brand-primary);
  color: #fff;
  padding: 0.2rem 0.55rem;
  border-radius: var(--radius-sm);
  font-size: 0.9rem;
  font-weight: 800;
}

.nav-links {
  display: flex;
  align-items: center;
  gap: 2rem;
}

.nav-link {
  font-size: 0.95rem;
  font-weight: 600;
  color: var(--text-secondary);
  transition: var(--transition-fast);
  position: relative;
  padding: 0.5rem 0;
}

.nav-link:hover, .nav-link.active {
  color: var(--brand-primary);
}

.nav-link.active::after {
  content: '';
  position: absolute;
  bottom: 0;
  left: 0;
  width: 100%;
  height: 3px;
  background: var(--brand-primary);
  border-radius: 2px;
}

/* Navbar Dropdown Menu */
.dropdown {
  position: relative;
  display: inline-block;
}

.dropdown-menu {
  position: absolute;
  top: 100%;
  left: 0;
  min-width: 280px;
  background: #ffffff;
  border: 1px solid var(--border-color);
  border-radius: var(--radius-sm);
  box-shadow: 0 10px 30px rgba(0, 0, 0, 0.12);
  padding: 0.5rem 0;
  display: none;
  z-index: 1100;
}

.dropdown:hover .dropdown-menu {
  display: block;
}

.dropdown-item {
  display: block;
  padding: 0.65rem 1.25rem;
  font-size: 0.9rem;
  color: var(--text-primary);
  font-weight: 600;
  transition: var(--transition-fast);
}

.dropdown-item:hover {
  background: var(--bg-secondary);
  color: var(--brand-primary);
}

.mobile-toggle {
  display: none;
  background: none;
  border: none;
  color: var(--text-primary);
  font-size: 1.5rem;
  cursor: pointer;
}

@media (max-width: 768px) {
  .mobile-toggle {
    display: block;
  }
  
  .nav-links {
    position: fixed;
    top: 85px;
    left: 0;
    width: 100%;
    background: #ffffff;
    flex-direction: column;
    padding: 2rem;
    gap: 1.5rem;
    border-bottom: 1px solid var(--border-color);
    box-shadow: 0 10px 25px rgba(0,0,0,0.08);
    transform: translateY(-150%);
    transition: var(--transition-normal);
  }
  
  .nav-links.active {
    transform: translateY(0);
  }
}

/* ==========================================================================
   Typography & Badges
   ========================================================================== */
.tag-badge {
  display: inline-flex;
  align-items: center;
  gap: 0.5rem;
  padding: 0.4rem 1rem;
  border-radius: 50px;
  font-size: 0.85rem;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.5px;
  background: rgba(68, 102, 119, 0.1);
  color: var(--brand-primary);
  border: 1px solid rgba(68, 102, 119, 0.25);
  margin-bottom: 1.5rem;
}

.tag-badge.pipeline {
  background: rgba(217, 119, 6, 0.1);
  color: var(--accent-amber);
  border-color: rgba(217, 119, 6, 0.3);
}

.heading-xl {
  font-family: var(--font-heading);
  font-size: 3.5rem;
  font-weight: 800;
  line-height: 1.15;
  letter-spacing: -1px;
  color: var(--text-primary);
  margin-bottom: 1.5rem;
}

.heading-lg {
  font-family: var(--font-heading);
  font-size: 2.5rem;
  font-weight: 700;
  line-height: 1.2;
  color: var(--text-primary);
  margin-bottom: 1rem;
}

.heading-md {
  font-family: var(--font-heading);
  font-size: 1.4rem;
  font-weight: 700;
  color: var(--text-primary);
  margin-bottom: 0.75rem;
}

.text-gradient {
  color: var(--brand-primary);
  background: linear-gradient(135deg, var(--brand-primary) 0%, var(--brand-teal-deep) 100%);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
}

.text-gradient-emerald {
  color: var(--brand-teal-accent);
  background: linear-gradient(135deg, var(--brand-primary) 0%, var(--accent-cyan) 100%);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
}

.text-sub {
  font-size: 1.15rem;
  color: var(--text-secondary);
  max-width: 650px;
  margin-bottom: 2.5rem;
}

/* ==========================================================================
   Buttons & Controls
   ========================================================================== */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 0.75rem;
  padding: 0.85rem 1.75rem;
  border-radius: var(--radius-sm);
  font-family: var(--font-body);
  font-size: 0.95rem;
  font-weight: 700;
  cursor: pointer;
  transition: var(--transition-fast);
  border: none;
}

.btn-primary {
  background: var(--brand-primary);
  color: #ffffff;
  box-shadow: 0 4px 15px rgba(68, 102, 119, 0.3);
}

.btn-primary:hover {
  background: var(--brand-teal-deep);
  transform: translateY(-2px);
  box-shadow: 0 8px 25px rgba(68, 102, 119, 0.45);
}

.btn-secondary {
  background: #ffffff;
  color: var(--brand-primary);
  border: 1px solid var(--border-color);
  box-shadow: 0 2px 6px rgba(0,0,0,0.03);
}

.btn-secondary:hover {
  background: var(--bg-secondary);
  border-color: var(--brand-primary);
  color: var(--brand-teal-deep);
}

/* ==========================================================================
   Card System (Clean Light Theme)
   ========================================================================== */
.card {
  background: var(--bg-card);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-md);
  padding: 2rem;
  transition: var(--transition-normal);
  position: relative;
  overflow: hidden;
  box-shadow: var(--shadow-card);
}

.card:hover {
  border-color: var(--border-glow);
  transform: translateY(-4px);
  box-shadow: var(--shadow-glow);
}

.card-icon {
  width: 52px;
  height: 52px;
  border-radius: var(--radius-sm);
  background: rgba(68, 102, 119, 0.1);
  color: var(--brand-primary);
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 1.5rem;
  margin-bottom: 1.25rem;
  border: 1px solid rgba(68, 102, 119, 0.2);
}

/* ==========================================================================
   DARE Values Grid (Values Page)
   ========================================================================== */
.dare-grid {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 1.5rem;
  margin-top: 3rem;
}

@media (max-width: 992px) {
  .dare-grid {
    grid-template-columns: repeat(2, 1fr);
  }
}

@media (max-width: 576px) {
  .dare-grid {
    grid-template-columns: 1fr;
  }
}

.dare-card {
  background: var(--bg-card);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-md);
  padding: 2.5rem 1.75rem;
  text-align: center;
  position: relative;
  transition: var(--transition-normal);
  box-shadow: var(--shadow-card);
}

.dare-card::before {
  content: '';
  position: absolute;
  top: 0;
  left: 0;
  width: 100%;
  height: 4px;
  background: var(--brand-primary);
  transition: var(--transition-fast);
}

.dare-card:hover::before {
  background: var(--accent-cyan);
}

.dare-letter {
  font-family: var(--font-heading);
  font-size: 4rem;
  font-weight: 800;
  color: var(--brand-primary);
  line-height: 1;
  margin-bottom: 0.5rem;
}

.dare-title {
  font-size: 1.35rem;
  font-weight: 700;
  color: var(--text-primary);
  margin-bottom: 0.75rem;
}

/* ==========================================================================
   4-Layer Solution Model (Solution Page)
   ========================================================================== */
.layer-timeline {
  display: flex;
  flex-direction: column;
  gap: 2rem;
  margin-top: 3rem;
}

.layer-card {
  display: grid;
  grid-template-columns: 100px 1fr;
  gap: 2rem;
  background: var(--bg-card);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-md);
  padding: 2rem;
  align-items: center;
  box-shadow: var(--shadow-card);
  transition: var(--transition-normal);
}

.layer-card:hover {
  border-color: var(--border-glow);
  box-shadow: var(--shadow-glow);
}

.layer-num {
  font-family: var(--font-heading);
  font-size: 2.5rem;
  font-weight: 800;
  color: var(--brand-primary);
  background: rgba(68, 102, 119, 0.08);
  width: 80px;
  height: 80px;
  border-radius: var(--radius-sm);
  display: flex;
  align-items: center;
  justify-content: center;
  border: 1px solid rgba(68, 102, 119, 0.2);
}

@media (max-width: 768px) {
  .layer-card {
    grid-template-columns: 1fr;
    gap: 1rem;
  }
}

/* ==========================================================================
   Product Page Styles (KS2-ESC)
   ========================================================================== */
.spec-grid {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 1rem;
  margin-top: 1.5rem;
}

.spec-item {
  background: var(--bg-secondary);
  padding: 1rem 1.25rem;
  border-radius: var(--radius-sm);
  border: 1px solid var(--border-color);
}

.spec-label {
  font-size: 0.85rem;
  color: var(--text-muted);
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.5px;
  margin-bottom: 0.25rem;
}

.spec-value {
  font-family: var(--font-mono);
  font-size: 1rem;
  color: var(--text-primary);
  font-weight: 600;
}

.tab-buttons {
  display: flex;
  gap: 1rem;
  border-bottom: 2px solid var(--border-color);
  margin-bottom: 2rem;
}

.tab-btn {
  background: none;
  border: none;
  padding: 1rem 1.5rem;
  font-family: var(--font-heading);
  font-size: 1rem;
  font-weight: 700;
  color: var(--text-secondary);
  cursor: pointer;
  position: relative;
  transition: var(--transition-fast);
}

.tab-btn.active {
  color: var(--brand-primary);
}

.tab-btn.active::after {
  content: '';
  position: absolute;
  bottom: -2px;
  left: 0;
  width: 100%;
  height: 3px;
  background: var(--brand-primary);
}

.tab-content {
  display: none;
}

.tab-content.active {
  display: block;
}

/* ==========================================================================
   Footer & Contact Form
   ========================================================================== */
.footer {
  background: var(--bg-secondary);
  border-top: 1px solid var(--border-color);
  padding: 4rem 0 2rem;
  margin-top: 4rem;
}

.footer-grid {
  display: grid;
  grid-template-columns: 2fr 1fr 1fr 1fr;
  gap: 3rem;
  margin-bottom: 3rem;
}

@media (max-width: 992px) {
  .footer-grid {
    grid-template-columns: 1fr 1fr;
  }
}

.footer-brand {
  max-width: 350px;
}

.footer-title {
  font-family: var(--font-heading);
  font-size: 1.1rem;
  font-weight: 700;
  margin-bottom: 1.25rem;
  color: var(--text-primary);
}

.footer-links {
  display: flex;
  flex-direction: column;
  gap: 0.75rem;
}

.footer-link {
  color: var(--text-secondary);
  font-size: 0.9rem;
  font-weight: 500;
  transition: var(--transition-fast);
}

.footer-link:hover {
  color: var(--brand-primary);
}

.footer-bottom {
  border-top: 1px solid var(--border-color);
  padding-top: 2rem;
  display: flex;
  justify-content: space-between;
  align-items: center;
  font-size: 0.85rem;
  color: var(--text-muted);
}

.form-group {
  margin-bottom: 1.25rem;
}

.form-label {
  display: block;
  font-size: 0.9rem;
  font-weight: 600;
  margin-bottom: 0.5rem;
  color: var(--text-secondary);
}

.form-input, .form-textarea {
  width: 100%;
  padding: 0.85rem 1rem;
  background: #ffffff;
  border: 1px solid var(--border-color);
  border-radius: var(--radius-sm);
  color: var(--text-primary);
  font-family: var(--font-body);
  font-size: 0.95rem;
  transition: var(--transition-fast);
}

.form-input:focus, .form-textarea:focus {
  outline: none;
  border-color: var(--brand-primary);
  box-shadow: 0 0 10px rgba(68, 102, 119, 0.2);
}