@import url('https://fonts.googleapis.com/css2?family=Outfit:wght@300;400;500;600;700;800&family=Plus+Jakarta+Sans:ital,wght@0,300;0,400;0,500;0,600;0,700;1,400&display=swap');

@layer reset, base, theme, components, utilities;

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

  html {
    scroll-behavior: smooth;
    -webkit-text-size-adjust: none;
  }

  body {
    min-block-size: 100vh;
    text-rendering: optimizeSpeed;
    line-height: 1.5;
  }

  img, picture, svg, video {
    display: block;
    max-inline-size: 100%;
    block-size: auto;
  }

  input, button, textarea, select {
    font: inherit;
  }

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

  ul, ol {
    list-style: none;
  }
}

@layer base {
  :root {
    /* Tier 1: Literal tokens */
    --clr-teal-500: oklch(0.62 0.16 195);
    --clr-teal-600: oklch(0.55 0.15 195);
    --clr-teal-100: oklch(0.92 0.04 195);
    --clr-yellow-500: oklch(0.82 0.19 82);
    --clr-yellow-600: oklch(0.75 0.18 82);
    --clr-yellow-100: oklch(0.95 0.05 82);
    
    --clr-dark-bg: oklch(0.12 0.015 240);
    --clr-dark-surface: oklch(0.16 0.02 240);
    --clr-dark-surface-elevated: oklch(0.20 0.02 240);
    
    --clr-light-bg: oklch(0.98 0.005 240);
    --clr-light-surface: oklch(1 0 0);
    --clr-light-surface-elevated: oklch(0.94 0.005 240);

    /* Tier 2: Semantic tokens */
    --bg-primary: light-dark(var(--clr-light-bg), var(--clr-dark-bg));
    --bg-surface: light-dark(var(--clr-light-surface), var(--clr-dark-surface));
    --bg-surface-elevated: light-dark(var(--clr-light-surface-elevated), var(--clr-dark-surface-elevated));
    
    --text-primary: light-dark(oklch(0.15 0.01 240), oklch(0.97 0.01 240));
    --text-secondary: light-dark(oklch(0.42 0.01 240), oklch(0.72 0.01 240));
    
    --color-primary: var(--clr-teal-500);
    --color-primary-hover: var(--clr-teal-600);
    --color-accent: var(--clr-yellow-500);
    --color-accent-hover: var(--clr-yellow-600);

    --border-color: light-dark(oklch(0.9 0.01 240), oklch(0.25 0.02 240));
    --border-color-glow: light-dark(oklch(0.62 0.16 195 / 0.15), oklch(0.62 0.16 195 / 0.3));

    /* Tier 3: Glassmorphism tokens */
    --glass-bg: light-dark(rgba(255, 255, 255, 0.45), rgba(20, 20, 25, 0.45));
    --glass-border: light-dark(rgba(0, 0, 0, 0.06), rgba(255, 255, 255, 0.08));
    --glass-shadow: light-dark(
      0 8px 32px 0 rgba(31, 38, 135, 0.04), 
      0 8px 32px 0 rgba(0, 0, 0, 0.37)
    );
    --glass-blur: blur(12px);

    /* Fonts & Radii */
    --font-sans: 'Plus Jakarta Sans', sans-serif;
    --font-display: 'Outfit', sans-serif;
    --radius-lg: 24px;
    --radius-md: 16px;
    --radius-sm: 8px;

    /* Spacing */
    --space-xs: 0.5rem;
    --space-sm: 1rem;
    --space-md: 1.5rem;
    --space-lg: 2rem;
    --space-xl: 3.5rem;
    --space-xxl: 6rem;

    color-scheme: light dark;
  }

  #stars-canvas {
    position: fixed;
    top: 0;
    left: 0;
    width: 100vw;
    height: 100vh;
    z-index: -1;
    pointer-events: none;
  }

  body {
    background-color: var(--bg-primary);
    color: var(--text-primary);
    font-family: var(--font-sans);
    overflow-x: hidden;
  }

  h1, h2, h3, h4, h5, h6 {
    font-family: var(--font-display);
    font-weight: 700;
    line-height: 1.15;
    color: var(--text-primary);
  }

  /* Custom Scrollbars */
  ::-webkit-scrollbar {
    width: 10px;
    height: 10px;
  }
  ::-webkit-scrollbar-track {
    background: var(--bg-primary);
  }
  ::-webkit-scrollbar-thumb {
    background: var(--border-color);
    border-radius: var(--radius-sm);
    border: 2px solid var(--bg-primary);
  }
  ::-webkit-scrollbar-thumb:hover {
    background: var(--text-secondary);
  }
}

@layer theme {
  /* Selection colors */
  ::selection {
    background-color: var(--clr-teal-100);
    color: var(--clr-teal-600);
  }
  
  html.dark ::selection {
    background-color: var(--clr-teal-600);
    color: var(--clr-light-bg);
  }

  /* High contrast mode adaptations */
  @media (forced-colors: active) {
    :root {
      --glass-bg: Canvas;
      --glass-border: CanvasText;
      --glass-shadow: none;
    }
    
    .btn-primary, .btn-secondary, .btn-accent {
      border: 1px solid ButtonText !important;
      background: ButtonFace !important;
      color: ButtonText !important;
    }
  }
}

@layer components {
  /* Site Layout Container */
  .container {
    inline-size: 100%;
    max-inline-size: 1200px;
    margin-inline: auto;
    padding-inline: var(--space-md);
  }

  /* Sticky Navigation Header */
  .header {
    position: fixed;
    top: 0;
    left: 0;
    inline-size: 100%;
    z-index: 100;
    background: var(--glass-bg);
    backdrop-filter: var(--glass-blur);
    -webkit-backdrop-filter: var(--glass-blur);
    border-bottom: 1px solid var(--glass-border);
    box-shadow: var(--glass-shadow);
    transition: background 0.3s, padding 0.3s;
  }

  .nav-container {
    display: flex;
    justify-content: space-between;
    align-items: center;
    block-size: 80px;
    transition: block-size 0.3s;
  }

  .header.shrink .nav-container {
    block-size: 64px;
  }

  .logo {
    display: flex;
    align-items: center;
    gap: var(--space-xs);
    font-family: var(--font-display);
    font-weight: 800;
    font-size: 1.5rem;
    color: var(--text-primary);
  }

  .logo :is(svg, img) {
    inline-size: 32px;
    block-size: 32px;
    object-fit: contain;
  }

  .nav-menu {
    display: flex;
    gap: var(--space-lg);
  }

  .nav-link {
    font-weight: 500;
    font-size: 0.95rem;
    color: var(--text-secondary);
    transition: color 0.2s;
    position: relative;
    padding-block: var(--space-xs);
  }

  .nav-link::after {
    content: '';
    position: absolute;
    bottom: 0;
    left: 0;
    width: 0;
    height: 2px;
    background-color: var(--color-primary);
    transition: width 0.2s;
  }

  .nav-link:hover {
    color: var(--text-primary);
  }

  .nav-link:hover::after {
    width: 100%;
  }

  .nav-actions {
    display: flex;
    align-items: center;
    gap: var(--space-sm);
  }

  /* Hamburger Menu for Mobile */
  .menu-toggle {
    display: none;
    background: none;
    border: none;
    cursor: pointer;
    padding: var(--space-xs);
    z-index: 110;
  }

  .menu-toggle span {
    display: block;
    width: 24px;
    height: 2px;
    background-color: var(--text-primary);
    margin-block: 5px;
    transition: transform 0.3s, opacity 0.3s;
  }

  /* Theme Toggle Button */
  .theme-toggle {
    background: none;
    border: 1px solid var(--border-color);
    border-radius: 50%;
    inline-size: 40px;
    block-size: 40px;
    display: flex;
    align-items: center;
    justify-content: center;
    cursor: pointer;
    color: var(--text-primary);
    transition: background-color 0.2s, border-color 0.2s;
  }

  .theme-toggle:hover {
    background-color: var(--bg-surface-elevated);
    border-color: var(--text-secondary);
  }

  /* Interactive Buttons */
  .btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    padding: 0.75rem 1.5rem;
    border-radius: var(--radius-md);
    font-weight: 600;
    font-size: 0.95rem;
    cursor: pointer;
    transition: transform 0.2s, background-color 0.2s, color 0.2s;
    min-block-size: 44px; /* Touch target */
    border: 1px solid transparent;
  }

  .btn:active {
    transform: scale(0.97);
  }

  .btn-primary {
    background-color: var(--color-primary);
    color: #ffffff;
  }

  .btn-primary:hover:not(:disabled) {
    background-color: var(--color-primary-hover);
  }

  .btn-secondary {
    background-color: var(--bg-surface);
    color: var(--text-primary);
    border-color: var(--border-color);
  }

  .btn-secondary:hover:not(:disabled) {
    background-color: var(--bg-surface-elevated);
  }

  .btn-accent {
    background-color: var(--color-accent);
    color: oklch(0.12 0.015 240);
  }

  .btn-accent:hover:not(:disabled) {
    background-color: var(--color-accent-hover);
  }

  /* Hero Section */
  .hero-section {
    padding-block: calc(var(--space-xxl) + 40px) var(--space-xxl);
    position: relative;
    overflow: hidden;
  }

  .hero-container {
    display: grid;
    grid-template-columns: 1.1fr 0.9fr;
    gap: var(--space-xl);
    align-items: center;
  }

  .hero-content {
    display: flex;
    flex-direction: column;
    align-items: flex-start;
  }

  .hero-badge {
    display: inline-flex;
    align-items: center;
    gap: var(--space-xs);
    padding: 0.5rem 1rem;
    border-radius: 9999px;
    background-color: light-dark(oklch(from var(--clr-teal-500) 0.96 0.04 h), oklch(from var(--clr-teal-500) 0.2 0.06 h));
    color: var(--color-primary);
    font-weight: 600;
    font-size: 0.85rem;
    margin-block-end: var(--space-md);
    border: 1px solid var(--border-color-glow);
  }

  .hero-title {
    font-size: clamp(2.5rem, 1.5rem + 4vw, 4rem);
    margin-block-end: var(--space-md);
    text-wrap: balance;
  }

  .hero-subtitle {
    font-size: 1.15rem;
    color: var(--text-secondary);
    margin-block-end: var(--space-lg);
    max-inline-size: 540px;
    text-wrap: pretty;
  }

  .hero-actions {
    display: flex;
    gap: var(--space-sm);
    margin-block-end: var(--space-xl);
  }

  .hero-stats {
    display: flex;
    gap: var(--space-xl);
    border-top: 1px solid var(--border-color);
    padding-block-start: var(--space-lg);
    inline-size: 100%;
  }

  .stat-item h3 {
    font-size: 2rem;
    color: var(--color-primary);
  }

  .stat-item p {
    font-size: 0.85rem;
    color: var(--text-secondary);
    font-weight: 500;
  }

  /* Laptop/Mockup Wrapper */
  .hero-visual {
    position: relative;
    inline-size: 100%;
  }

  .laptop-mockup {
    background-color: var(--bg-surface-elevated);
    border: 8px solid light-dark(rgba(0, 0, 0, 0.8), rgba(255, 255, 255, 0.15));
    border-radius: var(--radius-lg);
    box-shadow: var(--glass-shadow);
    overflow: hidden;
    aspect-ratio: 16 / 10;
    position: relative;
  }

  .laptop-screen {
    inline-size: 100%;
    block-size: 100%;
    position: relative;
    background-color: #0b0c10;
  }

  .laptop-screen img {
    inline-size: 100%;
    block-size: 100%;
    object-fit: cover;
  }

  /* Interactive Classroom/Whiteboard Section */
  .classroom-section {
    padding-block: var(--space-xxl);
    background-color: var(--bg-surface);
    border-top: 1px solid var(--border-color);
    border-bottom: 1px solid var(--border-color);
  }

  .classroom-grid {
    display: grid;
    grid-template-columns: 0.8fr 1.2fr;
    gap: var(--space-xl);
    align-items: center;
  }

  .classroom-content h2 {
    font-size: clamp(2rem, 1.5rem + 2.5vw, 3rem);
    margin-block-end: var(--space-md);
  }

  .classroom-features {
    display: flex;
    flex-direction: column;
    gap: var(--space-md);
    margin-block-start: var(--space-lg);
  }

  .feature-pill {
    display: flex;
    gap: var(--space-sm);
    padding: var(--space-sm);
    border-radius: var(--radius-md);
    border: 1px solid var(--border-color);
    transition: background-color 0.2s, border-color 0.2s;
    cursor: pointer;
  }

  .feature-pill:hover, .feature-pill.active {
    background-color: var(--bg-surface-elevated);
    border-color: var(--color-primary);
  }

  .feature-pill svg {
    inline-size: 24px;
    block-size: 24px;
    flex-shrink: 0;
    color: var(--color-primary);
  }

  .feature-pill-title {
    font-weight: 700;
    margin-block-end: 4px;
  }

  .feature-pill-desc {
    font-size: 0.85rem;
    color: var(--text-secondary);
  }

  /* Live Whiteboard Workspace Component */
  .whiteboard-workspace {
    background-color: var(--bg-surface-elevated);
    border: 1px solid var(--border-color);
    border-radius: var(--radius-lg);
    overflow: hidden;
    box-shadow: var(--glass-shadow);
    display: flex;
    flex-direction: column;
    aspect-ratio: 4 / 3;
  }

  .whiteboard-header {
    background-color: light-dark(rgba(0, 0, 0, 0.02), rgba(255, 255, 255, 0.02));
    border-bottom: 1px solid var(--border-color);
    padding: var(--space-xs) var(--space-sm);
    display: flex;
    justify-content: space-between;
    align-items: center;
  }

  .whiteboard-title {
    font-size: 0.85rem;
    font-weight: 600;
    color: var(--text-secondary);
    display: flex;
    align-items: center;
    gap: 6px;
  }

  .whiteboard-dots {
    display: flex;
    gap: 6px;
  }

  .whiteboard-dot {
    width: 10px;
    height: 10px;
    border-radius: 50%;
    background-color: var(--border-color);
  }

  .whiteboard-dot.red { background-color: oklch(0.65 0.22 25); }
  .whiteboard-dot.yellow { background-color: oklch(0.78 0.18 78); }
  .whiteboard-dot.green { background-color: oklch(0.65 0.18 140); }

  .whiteboard-body {
    flex-grow: 1;
    position: relative;
    background-color: light-dark(#ffffff, #1a1b20);
    cursor: crosshair;
    overflow: hidden;
  }

  .whiteboard-canvas {
    display: block;
    inline-size: 100%;
    block-size: 100%;
    background-color: transparent;
  }

  .whiteboard-controls {
    padding: var(--space-sm);
    background-color: light-dark(#f8f9fa, #121316);
    border-top: 1px solid var(--border-color);
    display: flex;
    gap: var(--space-md);
    align-items: center;
    justify-content: space-between;
  }

  .whiteboard-tools {
    display: flex;
    gap: var(--space-xs);
  }

  .tool-btn {
    background: none;
    border: 1px solid transparent;
    cursor: pointer;
    border-radius: var(--radius-sm);
    width: 36px;
    height: 36px;
    display: flex;
    align-items: center;
    justify-content: center;
    color: var(--text-secondary);
    transition: background-color 0.2s, color 0.2s, border-color 0.2s;
  }

  .tool-btn:hover {
    background-color: var(--border-color);
    color: var(--text-primary);
  }

  .tool-btn.active {
    background-color: light-dark(rgba(0,0,0,0.06), rgba(255,255,255,0.08));
    color: var(--color-primary);
    border-color: var(--border-color);
  }

  .whiteboard-colors {
    display: flex;
    gap: 8px;
  }

  .color-swatch {
    width: 24px;
    height: 24px;
    border-radius: 50%;
    cursor: pointer;
    border: 2px solid transparent;
    transition: transform 0.2s, border-color 0.2s;
  }

  .color-swatch:hover {
    transform: scale(1.1);
  }

  .color-swatch.active {
    border-color: var(--text-primary);
    transform: scale(1.1);
  }

  /* Mobile App Showcase Section */
  .mobile-section {
    padding-block: var(--space-xxl);
    position: relative;
  }

  .mobile-container {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: var(--space-xl);
    align-items: center;
  }

  .mobile-visual {
    display: flex;
    justify-content: center;
    align-items: center;
    position: relative;
  }

  /* Phone Mockup */
  .phone-mockup {
    width: 320px;
    height: 640px;
    border: 10px solid light-dark(rgba(0, 0, 0, 0.8), rgba(255, 255, 255, 0.15));
    border-radius: 40px;
    background-color: #0b0c10;
    box-shadow: var(--glass-shadow);
    overflow: hidden;
    position: relative;
  }

  .phone-screen {
    width: 100%;
    height: 100%;
    position: relative;
  }

  .phone-screen img {
    width: 100%;
    height: 100%;
    object-fit: cover;
  }

  /* Interactive Scheduler / Schedule Widget Demo */
  .scheduler-section {
    padding-block: var(--space-xxl);
    background-color: var(--bg-surface);
    border-top: 1px solid var(--border-color);
  }

  .scheduler-container {
    display: grid;
    grid-template-columns: 1.1fr 0.9fr;
    gap: var(--space-xl);
    align-items: center;
  }

  /* Scheduler widget styling */
  .scheduler-widget {
    background-color: var(--bg-surface-elevated);
    border: 1px solid var(--border-color);
    border-radius: var(--radius-lg);
    padding: var(--space-md);
    box-shadow: var(--glass-shadow);
    display: flex;
    flex-direction: column;
    gap: var(--space-md);
  }

  .scheduler-calendar {
    display: flex;
    flex-direction: column;
    gap: var(--space-xs);
  }

  .calendar-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: var(--space-xs);
  }

  .calendar-grid {
    display: grid;
    grid-template-columns: repeat(7, 1fr);
    gap: 6px;
    text-align: center;
  }

  .calendar-day-label {
    font-size: 0.75rem;
    font-weight: 700;
    color: var(--text-secondary);
    padding-bottom: 4px;
  }

  .calendar-day {
    aspect-ratio: 1;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 0.85rem;
    font-weight: 500;
    border-radius: var(--radius-sm);
    cursor: pointer;
    transition: background-color 0.2s, color 0.2s;
    background-color: transparent;
    border: 1px solid transparent;
    position: relative;
  }

  .calendar-day.inactive {
    color: light-dark(oklch(0.8 0 0), oklch(0.4 0 0));
    pointer-events: none;
  }

  .calendar-day:hover:not(.inactive) {
    background-color: var(--border-color);
  }

  .calendar-day.active {
    background-color: var(--color-primary);
    color: #ffffff;
    font-weight: 700;
  }

  .calendar-day.has-slot::after {
    content: '';
    position: absolute;
    width: 4px;
    height: 4px;
    background-color: var(--color-accent);
    border-radius: 50%;
    transform: translateY(12px);
  }

  .scheduler-slots {
    display: flex;
    flex-direction: column;
    gap: var(--space-xs);
  }

  .slots-title {
    font-size: 0.9rem;
    font-weight: 700;
    color: var(--text-secondary);
  }

  .slots-grid {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 8px;
  }

  .slot-btn {
    padding: 0.5rem;
    border-radius: var(--radius-sm);
    border: 1px solid var(--border-color);
    background: none;
    font-size: 0.85rem;
    font-weight: 600;
    cursor: pointer;
    transition: background-color 0.2s, border-color 0.2s, color 0.2s;
    color: var(--text-primary);
  }

  .slot-btn:hover:not(:disabled) {
    border-color: var(--color-primary);
    background-color: light-dark(oklch(from var(--clr-teal-500) 0.98 0.01 h), oklch(from var(--clr-teal-500) 0.15 0.02 h));
  }

  .slot-btn.selected {
    background-color: var(--color-primary);
    border-color: var(--color-primary);
    color: #ffffff;
  }

  .slot-btn:disabled {
    opacity: 0.3;
    cursor: not-allowed;
  }

  .scheduler-actions {
    display: flex;
    justify-content: flex-end;
    gap: var(--space-xs);
  }

  .booking-confirm-card {
    padding: var(--space-sm);
    border-radius: var(--radius-md);
    background-color: light-dark(oklch(from var(--clr-teal-500) 0.97 0.02 h), oklch(from var(--clr-teal-500) 0.15 0.03 h));
    border: 1px solid var(--border-color-glow);
    display: flex;
    flex-direction: column;
    gap: 6px;
    display: none;
  }

  .booking-confirm-card h4 {
    font-size: 0.95rem;
    color: var(--color-primary);
  }

  .booking-confirm-card p {
    font-size: 0.85rem;
    color: var(--text-secondary);
  }

  /* Features Grid Section */
  .features-section {
    padding-block: var(--space-xxl);
  }

  .features-header {
    text-align: center;
    max-inline-size: 600px;
    margin-inline: auto;
    margin-block-end: var(--space-xl);
  }

  .features-header h2 {
    font-size: clamp(2rem, 1.5rem + 2.5vw, 3rem);
    margin-block-end: var(--space-sm);
  }

  .features-header p {
    color: var(--text-secondary);
  }

  .features-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
    gap: var(--space-lg);
  }

  .feature-card {
    background-color: var(--bg-surface);
    border: 1px solid var(--border-color);
    border-radius: var(--radius-lg);
    padding: var(--space-lg);
    transition: transform 0.3s, border-color 0.3s, box-shadow 0.3s;
    box-shadow: 0 4px 12px rgba(0,0,0,0.02);
  }

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

  .feature-icon-wrapper {
    width: 48px;
    height: 48px;
    border-radius: var(--radius-md);
    background-color: light-dark(oklch(from var(--clr-teal-500) 0.96 0.04 h), oklch(from var(--clr-teal-500) 0.2 0.06 h));
    color: var(--color-primary);
    display: flex;
    align-items: center;
    justify-content: center;
    margin-block-end: var(--space-md);
  }

  .feature-icon-wrapper.accent {
    background-color: light-dark(oklch(from var(--clr-yellow-500) 0.96 0.04 h), oklch(from var(--clr-yellow-500) 0.2 0.06 h));
    color: var(--color-accent);
  }

  .feature-card h3 {
    font-size: 1.25rem;
    margin-block-end: var(--space-xs);
  }

  .feature-card p {
    color: var(--text-secondary);
    font-size: 0.9rem;
  }

  /* FAQ Section - Interactive Accordion */
  .faq-section {
    padding-block: var(--space-xxl);
    background-color: var(--bg-surface);
    border-top: 1px solid var(--border-color);
  }

  .faq-title {
    text-align: center;
    font-size: clamp(2rem, 1.5rem + 2.5vw, 3rem);
    margin-block-end: var(--space-xl);
  }

  .faq-list {
    max-inline-size: 800px;
    margin-inline: auto;
    display: flex;
    flex-direction: column;
    gap: var(--space-sm);
  }

  .faq-item {
    background-color: var(--bg-surface-elevated);
    border: 1px solid var(--border-color);
    border-radius: var(--radius-md);
    overflow: hidden;
    transition: border-color 0.2s;
  }

  .faq-item:hover {
    border-color: var(--color-primary);
  }

  details {
    width: 100%;
  }

  summary {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: var(--space-md);
    font-weight: 700;
    cursor: pointer;
    list-style: none;
    user-select: none;
  }

  summary::-webkit-details-marker {
    display: none;
  }

  .summary-icon {
    transition: transform 0.2s;
    color: var(--text-secondary);
    flex-shrink: 0;
  }

  details[open] .summary-icon {
    transform: rotate(180deg);
    color: var(--color-primary);
  }

  .faq-answer {
    padding: 0 var(--space-md) var(--space-md) var(--space-md);
    color: var(--text-secondary);
    font-size: 0.95rem;
  }

  /* Login Page Components */
  .login-body {
    display: flex;
    align-items: center;
    justify-content: center;
    min-block-size: 100vh;
    padding: var(--space-md);
    background: radial-gradient(circle at 10% 20%, light-dark(rgba(98, 201, 195, 0.08), rgba(98, 201, 195, 0.03)) 0%, transparent 40%),
                radial-gradient(circle at 90% 80%, light-dark(rgba(242, 204, 82, 0.08), rgba(242, 204, 82, 0.03)) 0%, transparent 45%),
                var(--bg-primary);
  }

  .login-card {
    background: var(--glass-bg);
    backdrop-filter: var(--glass-blur);
    -webkit-backdrop-filter: var(--glass-blur);
    border: 1px solid var(--glass-border);
    box-shadow: var(--glass-shadow);
    border-radius: var(--radius-lg);
    inline-size: 100%;
    max-inline-size: 420px;
    padding: var(--space-xl) var(--space-lg) var(--space-lg) var(--space-lg);
    display: flex;
    flex-direction: column;
    gap: var(--space-md);
    position: relative;
  }

  .login-header {
    text-align: center;
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: var(--space-xs);
    margin-block-end: var(--space-sm);
  }

  .login-header .logo {
    font-size: 1.8rem;
    gap: 8px;
  }

  .login-header h2 {
    font-size: 1.5rem;
    margin-block-start: var(--space-xs);
  }

  .login-header p {
    color: var(--text-secondary);
    font-size: 0.9rem;
  }

  .login-tabs {
    display: grid;
    grid-template-columns: 1fr 1fr;
    background-color: var(--bg-surface-elevated);
    border-radius: var(--radius-md);
    padding: 4px;
    border: 1px solid var(--border-color);
  }

  .login-tab-btn {
    background: none;
    border: none;
    padding: 0.5rem;
    font-size: 0.85rem;
    font-weight: 600;
    cursor: pointer;
    border-radius: calc(var(--radius-md) - 2px);
    transition: background-color 0.2s, color 0.2s;
    color: var(--text-secondary);
  }

  .login-tab-btn.active {
    background-color: var(--bg-surface);
    color: var(--color-primary);
    box-shadow: 0 2px 8px rgba(0,0,0,0.05);
  }

  .form-group {
    display: flex;
    flex-direction: column;
    gap: 6px;
  }

  .form-label {
    font-size: 0.85rem;
    font-weight: 700;
    color: var(--text-secondary);
  }

  .input-wrapper {
    position: relative;
    display: flex;
    align-items: center;
  }

  .form-input {
    inline-size: 100%;
    padding: 0.75rem 1rem;
    border-radius: var(--radius-md);
    border: 1px solid var(--border-color);
    background-color: var(--bg-surface);
    color: var(--text-primary);
    font-size: 0.95rem;
    transition: border-color 0.2s, box-shadow 0.2s;
  }

  .form-input:focus {
    outline: none;
    border-color: var(--color-primary);
    box-shadow: 0 0 0 3px var(--border-color-glow);
  }

  .form-input:user-invalid {
    border-color: oklch(0.65 0.22 25);
  }

  .password-toggle-btn {
    position: absolute;
    right: var(--space-sm);
    background: none;
    border: none;
    color: var(--text-secondary);
    cursor: pointer;
    display: flex;
    align-items: center;
    justify-content: center;
    padding: var(--space-xs);
  }

  .password-toggle-btn:hover {
    color: var(--text-primary);
  }

  .login-options {
    display: flex;
    justify-content: space-between;
    align-items: center;
    font-size: 0.85rem;
    font-weight: 600;
  }

  .remember-me {
    display: flex;
    align-items: center;
    gap: 6px;
    cursor: pointer;
    color: var(--text-secondary);
  }

  .remember-me input {
    accent-color: var(--color-primary);
  }

  .forgot-link {
    color: var(--color-primary);
    transition: color 0.2s;
  }

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

  .divider {
    display: flex;
    align-items: center;
    text-align: center;
    color: var(--text-secondary);
    font-size: 0.8rem;
    font-weight: 500;
    margin-block: var(--space-xs);
  }

  .divider::before, .divider::after {
    content: '';
    flex: 1;
    border-bottom: 1px solid var(--border-color);
  }

  .divider:not(:empty)::before {
    margin-inline-end: .5em;
  }

  .divider:not(:empty)::after {
    margin-inline-start: .5em;
  }

  .social-login-grid {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: var(--space-sm);
  }

  .btn-social {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: 8px;
    padding: 0.75rem 1rem;
    border-radius: var(--radius-md);
    border: 1px solid var(--border-color);
    background-color: var(--bg-surface);
    color: var(--text-primary);
    font-size: 0.9rem;
    font-weight: 600;
    cursor: pointer;
    transition: background-color 0.2s, border-color 0.2s;
  }

  .btn-social:hover {
    background-color: var(--bg-surface-elevated);
    border-color: var(--text-secondary);
  }

  .btn-social svg {
    inline-size: 18px;
    block-size: 18px;
  }

  .login-footer {
    text-align: center;
    font-size: 0.85rem;
    color: var(--text-secondary);
    margin-block-start: var(--space-xs);
  }

  .login-footer a {
    color: var(--color-primary);
    font-weight: 700;
  }

  .login-footer a:hover {
    color: var(--color-primary-hover);
  }

  .back-home-link {
    position: absolute;
    top: var(--space-sm);
    left: var(--space-sm);
    display: flex;
    align-items: center;
    gap: 4px;
    font-size: 0.8rem;
    font-weight: 600;
    color: var(--text-secondary);
    transition: color 0.2s;
  }

  .back-home-link:hover {
    color: var(--text-primary);
  }

  /* Footer */
  .footer {
    padding-block: var(--space-xl) var(--space-lg);
    background-color: var(--bg-primary);
    border-top: 1px solid var(--border-color);
    color: var(--text-secondary);
    font-size: 0.9rem;
  }

  .footer-container {
    display: grid;
    grid-template-columns: 2fr repeat(3, 1fr);
    gap: var(--space-xl);
    margin-block-end: var(--space-xl);
  }

  .footer-brand {
    display: flex;
    flex-direction: column;
    gap: var(--space-sm);
    align-items: flex-start;
  }

  .footer-desc {
    max-inline-size: 280px;
    text-wrap: pretty;
  }

  .footer-links-col {
    display: flex;
    flex-direction: column;
    gap: var(--space-sm);
  }

  .footer-links-col h4 {
    color: var(--text-primary);
    font-size: 0.95rem;
    font-weight: 700;
  }

  .footer-link {
    transition: color 0.2s;
  }

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

  .footer-bottom {
    display: flex;
    justify-content: space-between;
    align-items: center;
    border-top: 1px solid var(--border-color);
    padding-block-start: var(--space-lg);
  }

  .footer-socials {
    display: flex;
    gap: var(--space-sm);
  }

  .social-icon {
    width: 36px;
    height: 36px;
    border-radius: 50%;
    border: 1px solid var(--border-color);
    display: flex;
    align-items: center;
    justify-content: center;
    transition: border-color 0.2s, color 0.2s;
  }

  .social-icon:hover {
    border-color: var(--color-primary);
    color: var(--color-primary);
  }
}

@layer utilities {
  /* Scroll Reveal animation using CSS */
  @keyframes revealOnScroll {
    from {
      opacity: 0;
      transform: translateY(30px);
    }
    to {
      opacity: 1;
      transform: translateY(0);
    }
  }

  .reveal {
    opacity: 0;
    transform: translateY(30px);
    transition: opacity 0.6s ease-out, transform 0.6s ease-out;
  }

  .reveal.active {
    opacity: 1;
    transform: translateY(0);
  }

  /* Text balance utilities */
  .text-balance {
    text-wrap: balance;
  }

  .text-pretty {
    text-wrap: pretty;
  }

  /* Responsive styling changes */
  @media (max-width: 900px) {
    :root {
      --space-xxl: 4rem;
      --space-xl: 2rem;
    }

    .hero-container {
      grid-template-columns: 1fr;
      text-align: center;
      gap: var(--space-lg);
    }

    .hero-content {
      align-items: center;
    }

    .hero-actions {
      justify-content: center;
    }

    .hero-stats {
      justify-content: center;
    }

    .classroom-grid {
      grid-template-columns: 1fr;
      gap: var(--space-lg);
    }

    .mobile-container {
      grid-template-columns: 1fr;
      gap: var(--space-lg);
      text-align: center;
    }

    .mobile-container .hero-actions {
      justify-content: center;
    }

    .mobile-visual {
      order: -1;
    }

    .scheduler-container {
      grid-template-columns: 1fr;
      gap: var(--space-lg);
    }

    .footer-container {
      grid-template-columns: 1fr 1fr;
      gap: var(--space-lg);
    }
  }

  @media (max-width: 600px) {
    .nav-menu {
      display: none; /* Handled via mobile menu */
    }

    .nav-actions {
      display: none;
    }

    .menu-toggle {
      display: block;
    }

    .footer-container {
      grid-template-columns: 1fr;
      gap: var(--space-lg);
    }

    .footer-bottom {
      flex-direction: column;
      gap: var(--space-sm);
      text-align: center;
    }
  }
}

/* ==========================================================================
   Classroom Feature Showcase Panels Styling
   ========================================================================== */
.classroom-workspace-wrapper {
  inline-size: 100%;
  aspect-ratio: 4 / 3;
  position: relative;
  background-color: var(--bg-surface-elevated);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-lg);
  overflow: hidden;
  box-shadow: var(--glass-shadow);
}

.classroom-workspace-wrapper .pane-content {
  display: none;
  inline-size: 100%;
  block-size: 100%;
  flex-direction: column;
  animation: fadeScale 0.35s cubic-bezier(0.16, 1, 0.3, 1) forwards;
}

.classroom-workspace-wrapper .pane-content.active {
  display: flex;
}

/* Video Call Viewport styling */
.video-grid-body {
  flex-grow: 1;
  display: grid;
  grid-template-columns: 1.2fr 0.8fr;
  gap: var(--space-sm);
  padding: var(--space-sm);
  background-color: light-dark(#ffffff, #1a1b20);
  overflow: hidden;
}

.video-feed {
  position: relative;
  background-color: #0b0c10;
  border-radius: var(--radius-md);
  overflow: hidden;
  display: flex;
  align-items: center;
  justify-content: center;
  border: 1px solid var(--border-color);
}

.main-tutor-feed {
  block-size: 100%;
}

.main-tutor-feed img {
  inline-size: 100%;
  block-size: 100%;
  object-fit: cover;
}

.feed-label {
  position: absolute;
  bottom: var(--space-xs);
  left: var(--space-xs);
  background-color: rgba(0, 0, 0, 0.6);
  color: #ffffff;
  padding: 4px 8px;
  border-radius: var(--radius-sm);
  font-size: 0.8rem;
  font-weight: 600;
}

.feed-label-sm {
  position: absolute;
  bottom: 4px;
  left: 4px;
  background-color: rgba(0, 0, 0, 0.6);
  color: #ffffff;
  padding: 2px 6px;
  border-radius: 4px;
  font-size: 0.7rem;
  font-weight: 500;
}

.feed-mic-status {
  position: absolute;
  top: var(--space-xs);
  right: var(--space-xs);
  width: 24px;
  height: 24px;
  border-radius: 50%;
  background-color: var(--color-primary);
  color: white;
  display: flex;
  align-items: center;
  justify-content: center;
}

.stream-badge {
  background-color: oklch(0.65 0.22 25);
  color: white;
  font-size: 0.75rem;
  font-weight: 700;
  padding: 2px 8px;
  border-radius: 999px;
  letter-spacing: 0.05em;
}

.animate-pulse {
  animation: pulse 2s infinite;
}

@keyframes pulse {
  0%, 100% { opacity: 1; }
  50% { opacity: 0.4; }
}

.video-side-controls {
  display: flex;
  flex-direction: column;
  gap: var(--space-sm);
  block-size: 100%;
}

.student-feeds-row {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: var(--space-xs);
  height: 90px;
}

.student-feed img {
  inline-size: 100%;
  block-size: 100%;
  object-fit: cover;
}

/* Classroom Chat log mockup style */
.mock-chat-box {
  flex-grow: 1;
  background-color: var(--bg-surface-elevated);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-md);
  display: flex;
  flex-direction: column;
  overflow: hidden;
}

.chat-header-label {
  padding: var(--space-xs) var(--space-sm);
  background-color: light-dark(rgba(0,0,0,0.02), rgba(255,255,255,0.02));
  border-bottom: 1px solid var(--border-color);
  font-size: 0.8rem;
  font-weight: 700;
  color: var(--text-secondary);
}

.chat-messages {
  flex-grow: 1;
  padding: var(--space-xs) var(--space-sm);
  display: flex;
  flex-direction: column;
  gap: 6px;
  overflow-y: auto;
}

.chat-msg {
  font-size: 0.78rem;
  line-height: 1.35;
}

.chat-author {
  font-weight: 700;
  margin-inline-end: 4px;
}

.chat-author.student {
  color: var(--color-primary);
}

.chat-author.tutor {
  color: var(--color-accent);
}

.chat-text {
  color: var(--text-primary);
}

.chat-input-placeholder {
  padding: 8px var(--space-sm);
  border-top: 1px solid var(--border-color);
  display: flex;
  justify-content: space-between;
  align-items: center;
  color: var(--text-secondary);
  font-size: 0.8rem;
  background-color: light-dark(#ffffff, #1a1b20);
}

.video-toolbar-bottom {
  padding: var(--space-xs) var(--space-sm);
  background-color: light-dark(#f8f9fa, #121316);
  border-top: 1px solid var(--border-color);
  display: flex;
  justify-content: center;
  gap: var(--space-md);
}

.control-circle-btn {
  width: 36px;
  height: 36px;
  border-radius: 50%;
  border: 1px solid var(--border-color);
  background-color: var(--bg-surface);
  color: var(--text-primary);
  cursor: pointer;
  display: flex;
  align-items: center;
  justify-content: center;
  transition: background-color 0.2s, border-color 0.2s;
}

.control-circle-btn:hover {
  background-color: var(--bg-surface-elevated);
  border-color: var(--text-secondary);
}

/* Document Slide Pane styling */
.document-body {
  flex-grow: 1;
  background-color: light-dark(#ffffff, #1e1e24);
  padding: var(--space-md);
  display: flex;
  align-items: center;
  justify-content: center;
  overflow: hidden;
}

.document-pdf-slide {
  width: 100%;
  height: 100%;
  max-width: 500px;
  aspect-ratio: 4 / 3;
  border: 1px solid var(--border-color);
  border-radius: var(--radius-md);
  background-color: light-dark(#fdfdfd, #141518);
  box-shadow: 0 4px 16px rgba(0,0,0,0.03);
  padding: var(--space-sm);
  display: flex;
  flex-direction: column;
  overflow: hidden;
}

.pdf-svg-diagram {
  display: block;
  width: 100%;
  height: 100%;
}

@media (max-width: 768px) {
  .video-grid-body {
    grid-template-columns: 1fr;
    grid-template-rows: 1.2fr 0.8fr;
    overflow-y: auto;
  }
  .student-feeds-row {
    display: none; /* Hide side cameras on mobile for cleaner height layout */
  }
}

/* ==========================================================================
   Application Form Modal Styles
   ========================================================================== */
.modal-overlay {
  position: fixed;
  inset: 0;
  background-color: rgba(0, 0, 0, 0.4);
  backdrop-filter: blur(8px);
  -webkit-backdrop-filter: blur(8px);
  z-index: 2000;
  display: none;
  align-items: center;
  justify-content: center;
  padding: var(--space-md);
  opacity: 0;
  transition: opacity 0.25s ease;
}

.modal-overlay.active {
  display: flex;
  opacity: 1;
}

.modal-card {
  background-color: var(--bg-surface-elevated);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-lg);
  box-shadow: var(--glass-shadow);
  max-inline-size: 460px;
  inline-size: 100%;
  padding: var(--space-lg);
  position: relative;
  transform: scale(0.96);
  transition: transform 0.25s cubic-bezier(0.16, 1, 0.3, 1);
}

.modal-overlay.active .modal-card {
  transform: scale(1);
}

.modal-close-btn {
  position: absolute;
  top: var(--space-md);
  right: var(--space-md);
  background: none;
  border: none;
  color: var(--text-secondary);
  cursor: pointer;
  padding: 4px;
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
  transition: background-color 0.2s, color 0.2s;
}

.modal-close-btn:hover {
  background-color: light-dark(rgba(0,0,0,0.05), rgba(255,255,255,0.05));
  color: var(--text-primary);
}

.modal-header {
  display: flex;
  align-items: center;
  gap: var(--space-sm);
  margin-block-end: var(--space-xs);
}

.modal-header h3 {
  margin: 0;
  font-size: 1.25rem;
}

.modal-desc {
  font-size: 0.85rem;
  color: var(--text-secondary);
  line-height: 1.45;
  margin-block-end: var(--space-md);
}