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

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

  html {
    scroll-behavior: smooth;
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
  }

  body {
    min-height: 100vh;
    text-rendering: optimizeSpeed;
    line-height: 1.6;
  }

  img, picture, svg {
    display: block;
    max-width: 100%;
  }

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

  button {
    cursor: pointer;
    background: none;
    border: none;
  }

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

@layer theme {
  :root {
    /* Colors */
    --color-bg: #EEF3F5;
    --color-bg-elevated: #FFFFFF;
    --color-text-primary: #1A252C;
    --color-text-secondary: #4E5F6B;
    --color-text-tertiary: #8897A4;
    --color-accent: #0E7490;
    --color-accent-hover: #155E75;
    --color-accent-light: #E0F2FE;
    --color-border: #D1DBE1;
    --color-code-bg: #E6ECF0;
    
    /* Semantic Colors */
    --color-success: #16A34A;
    --color-warning: #CA8A04;
    --color-critical: #DC2626;

    /* Fonts */
    --font-heading: 'DM Serif Display', Georgia, serif;
    --font-body: 'Inter', system-ui, -apple-system, sans-serif;
    --font-code: 'JetBrains Mono', monospace;

    /* Spacing */
    --space-xs: 0.25rem;
    --space-sm: 0.5rem;
    --space-md: 1rem;
    --space-lg: 2rem;
    --space-xl: 4rem;
    --space-xxl: 8rem;

    /* Borders */
    --radius-sm: 4px;
    --radius-md: 8px;
    --radius-lg: 12px;
    --border-width: 1px;

    /* Shadows */
    --shadow-subtle: 0 2px 4px rgba(26, 37, 44, 0.04);
    --shadow-card: 0 4px 12px rgba(26, 37, 44, 0.05), 0 1px 3px rgba(26, 37, 44, 0.02);
    --shadow-focus: 0 0 0 3px rgba(14, 116, 144, 0.3);
  }
}

@layer base {
  body {
    background-color: var(--color-bg);
    /* Lab graph paper grid background */
    background-image: 
      linear-gradient(to right, rgba(14, 116, 144, 0.025) 1px, transparent 1px),
      linear-gradient(to bottom, rgba(14, 116, 144, 0.025) 1px, transparent 1px);
    background-size: 24px 24px;
    color: var(--color-text-primary);
    font-family: var(--font-body);
    font-size: 16px;
    overflow-x: hidden;
  }

  /* 3px Accent Line at Top of Page */
  body::before {
    content: '';
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 3px;
    background-color: var(--color-accent);
    z-index: 1000;
  }

  /* Futuristic, subtle watermark background graphic */
  body::after {
    content: '';
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background-image: url('bg-graphic.jpg');
    background-size: cover;
    background-position: center;
    background-repeat: no-repeat;
    opacity: 0.2; /* increased opacity to 0.2 as requested by the user */
    z-index: -1;
    pointer-events: none;
  }


  h1, h2, h3, h4 {
    font-family: var(--font-heading);
    color: var(--color-text-primary);
    font-weight: 400;
    line-height: 1.2;
  }

  h1 {
    font-size: clamp(2.25rem, 5vw, 3.5rem);
  }

  h2 {
    font-size: clamp(1.75rem, 4vw, 2.5rem);
    text-align: center;
    margin-bottom: var(--space-xl);
    position: relative;
  }

  /* Subtle separator under h2 sections */
  h2::after {
    content: '';
    display: block;
    width: 40px;
    height: 2px;
    background-color: var(--color-accent);
    margin: var(--space-md) auto 0 auto;
    opacity: 0.8;
  }

  p {
    color: var(--color-text-secondary);
    line-height: 1.7;
  }

  code, pre {
    font-family: var(--font-code);
  }

  /* Focus rings for accessibility */
  *:focus-visible {
    outline: none;
    box-shadow: var(--shadow-focus);
  }
}

@layer components {
  /* Navigation */
  .header {
    max-width: 1200px;
    margin: 0 auto;
    padding: var(--space-lg) var(--space-md);
    display: flex;
    justify-content: space-between;
    align-items: center;
    position: relative;
    z-index: 10;
  }

  .logo {
    font-family: var(--font-heading);
    font-size: 1.5rem;
    color: var(--color-text-primary);
    font-weight: 400;
    letter-spacing: -0.5px;
    display: flex;
    align-items: center;
    gap: var(--space-sm);
  }

  .logo-icon {
    color: var(--color-accent);
    width: 24px;
    height: 24px;
  }

  /* Buttons */
  .btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    padding: 0.75rem 1.5rem;
    font-size: 0.95rem;
    font-weight: 500;
    border-radius: var(--radius-md);
    transition: all 0.2s cubic-bezier(0.16, 1, 0.3, 1);
    white-space: nowrap;
    border: 1px solid transparent;
  }

  .btn-primary {
    background-color: var(--color-accent);
    color: var(--color-bg-elevated);
  }

  .btn-primary:hover {
    background-color: var(--color-accent-hover);
    transform: translateY(-1px);
  }

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

  .btn-secondary:hover {
    background-color: rgba(26, 26, 46, 0.03);
    border-color: var(--color-text-secondary);
  }

  .btn-large {
    padding: 1rem 2.25rem;
    font-size: 1.1rem;
    border-radius: var(--radius-md);
  }

  /* Cards */
  .card {
    background-color: var(--color-bg-elevated);
    border: var(--border-width) solid var(--color-border);
    border-radius: var(--radius-md);
    padding: var(--space-lg);
    box-shadow: var(--shadow-subtle);
    transition: all 0.3s cubic-bezier(0.16, 1, 0.3, 1);
    position: relative;
    overflow: hidden;
  }

  .card:hover {
    box-shadow: var(--shadow-card);
    transform: translateY(-2px);
    border-color: var(--color-accent);
  }

  /* Hero Section */
  .hero {
    max-width: 1200px;
    margin: 0 auto;
    padding: var(--space-xl) var(--space-md) var(--space-xxl) var(--space-md);
    text-align: center;
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: var(--space-xl);
  }

  .hero-text {
    max-width: 720px;
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: var(--space-md);
  }

  .eyebrow {
    font-size: 0.85rem;
    font-weight: 600;
    text-transform: uppercase;
    letter-spacing: 0.15em;
    color: var(--color-accent);
  }

  .hero-text h1 {
    margin-bottom: var(--space-sm);
  }

  .hero-text p {
    font-size: 1.125rem;
    margin-bottom: var(--space-lg);
  }

  .hero-cta-group {
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: var(--space-sm);
  }

  .hero-cta-note {
    font-size: 0.875rem;
    color: var(--color-text-tertiary);
  }

  /* Interactive Code Terminal (Hero Visual) */
  .terminal-card {
    width: 100%;
    max-width: 800px;
    background-color: var(--color-code-bg);
    border: var(--border-width) solid var(--color-border);
    border-radius: var(--radius-lg);
    overflow: hidden;
    box-shadow: var(--shadow-card);
    text-align: left;
    position: relative;
  }

  .terminal-header {
    background-color: rgba(26, 26, 46, 0.05);
    padding: var(--space-sm) var(--space-md);
    border-bottom: var(--border-width) solid var(--color-border);
    display: flex;
    align-items: center;
    justify-content: space-between;
  }

  .terminal-buttons {
    display: flex;
    gap: 6px;
  }

  .terminal-btn {
    width: 10px;
    height: 10px;
    border-radius: 50%;
    background-color: rgba(26, 26, 46, 0.15);
  }

  .terminal-title {
    font-family: var(--font-code);
    font-size: 0.75rem;
    color: var(--color-text-secondary);
  }

  .terminal-body {
    padding: var(--space-lg);
    font-family: var(--font-code);
    font-size: 0.875rem;
    color: var(--color-text-primary);
    overflow-x: auto;
    position: relative;
    overflow-wrap: anywhere;
  }

  @media (max-width: 768px) {
    .terminal-body {
      padding: var(--space-md);
      font-size: 0.775rem;
      line-height: 1.5;
    }
  }

  /* Animated Scanner Pulse Line */
  .terminal-scanner {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 2px;
    background: linear-gradient(to right, transparent, var(--color-accent), transparent);
    opacity: 0.4;
    animation: scan 4s linear infinite;
    pointer-events: none;
  }

  @keyframes scan {
    0% {
      top: 0%;
    }
    50% {
      top: 100%;
    }
    100% {
      top: 0%;
    }
  }

  .code-line {
    white-space: pre-wrap;
    line-height: 1.6;
  }

  .code-dim {
    color: var(--color-text-tertiary);
  }

  .code-highlight {
    background-color: var(--color-accent-light);
    border-radius: var(--radius-sm);
    padding: 0 4px;
    color: var(--color-accent);
  }

  .tag-success {
    background-color: rgba(45, 125, 70, 0.1);
    color: var(--color-success);
    padding: 2px 6px;
    border-radius: var(--radius-sm);
    font-weight: 500;
  }

  .tag-warning {
    background-color: rgba(196, 132, 29, 0.1);
    color: var(--color-warning);
    padding: 2px 6px;
    border-radius: var(--radius-sm);
    font-weight: 500;
  }

  .tag-critical {
    background-color: rgba(185, 59, 59, 0.1);
    color: var(--color-critical);
    padding: 2px 6px;
    border-radius: var(--radius-sm);
    font-weight: 500;
  }

  /* Section Styles */
  .section {
    max-width: 1200px;
    margin: 0 auto;
    padding: var(--space-xl) var(--space-md) var(--space-xxl) var(--space-md);
  }

  /* Features Grid */
  .features-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(320px, 1fr));
    gap: var(--space-lg);
  }

  .feature-card-icon {
    font-size: 1.75rem;
    margin-bottom: var(--space-md);
    display: inline-block;
    color: var(--color-accent);
  }

  .feature-card h3 {
    font-size: 1.25rem;
    margin-bottom: var(--space-sm);
  }

  /* How it Works Section */
  .steps-flow {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
    gap: var(--space-xl);
    position: relative;
  }

  .step-item {
    display: flex;
    flex-direction: column;
    align-items: center;
    text-align: center;
    position: relative;
  }

  .step-number {
    width: 48px;
    height: 48px;
    border-radius: 50%;
    background-color: var(--color-accent-light);
    color: var(--color-accent);
    display: flex;
    align-items: center;
    justify-content: center;
    font-weight: 600;
    font-size: 1.125rem;
    margin-bottom: var(--space-md);
    border: var(--border-width) solid var(--color-accent);
  }

  .step-item h3 {
    font-size: 1.25rem;
    margin-bottom: var(--space-sm);
  }

  .step-item p {
    font-size: 0.95rem;
    max-width: 280px;
  }

  /* Divider line between steps on desktop */
  @media (min-width: 768px) {
    .step-item:not(:last-child)::after {
      content: '';
      position: absolute;
      top: 24px;
      left: calc(50% + 40px);
      width: calc(100% - 80px);
      height: 1px;
      border-top: 1px dashed var(--color-border);
      z-index: -1;
    }
  }

  /* Sample Diagnosis Report Preview */
  .sample-diagnosis-container {
    display: flex;
    justify-content: center;
  }

  .report-terminal {
    width: 100%;
    max-width: 720px;
  }

  .report-header-text {
    border-bottom: 1px dashed var(--color-border);
    padding-bottom: var(--space-sm);
    margin-bottom: var(--space-md);
  }

  .report-section-title {
    font-weight: 600;
    margin: var(--space-md) 0 var(--space-sm) 0;
    font-size: 0.85rem;
    letter-spacing: 0.05em;
  }

  .report-list {
    list-style: none;
    display: flex;
    flex-direction: column;
    gap: var(--space-xs);
  }

  .report-list li {
    font-family: var(--font-code);
    font-size: 0.85rem;
    padding-left: var(--space-md);
    position: relative;
  }

  .report-list li::before {
    content: '├─';
    position: absolute;
    left: 0;
    color: var(--color-text-tertiary);
  }

  .report-list li:last-child::before {
    content: '└─';
  }

  /* Email Waitlist Capture Form */
  .waitlist-section {
    background-color: var(--color-bg-elevated);
    border: var(--border-width) solid var(--color-border);
    border-radius: var(--radius-lg);
    padding: var(--space-xl) var(--space-lg);
    max-width: 800px;
    margin: var(--space-xl) auto;
    text-align: center;
    box-shadow: var(--shadow-card);
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: var(--space-lg);
  }

  .waitlist-text {
    max-width: 520px;
  }

  .waitlist-text p {
    font-size: 1.1rem;
    margin-top: var(--space-sm);
  }

  .waitlist-form {
    width: 100%;
    max-width: 480px;
    display: flex;
    flex-direction: column;
    gap: var(--space-sm);
  }

  @media (min-width: 600px) {
    .waitlist-form {
      flex-direction: row;
    }
    
    .waitlist-form input {
      flex-grow: 1;
    }
  }

  .waitlist-form input[type="email"] {
    padding: 0.75rem 1rem;
    font-size: 0.95rem;
    border-radius: var(--radius-md);
    border: 1px solid var(--color-border);
    background-color: var(--color-bg);
    color: var(--color-text-primary);
    transition: all 0.2s ease;
    width: 100%;
  }

  .waitlist-form input[type="email"]:focus {
    border-color: var(--color-accent);
    background-color: var(--color-bg-elevated);
  }

  .waitlist-note {
    font-size: 0.85rem;
    color: var(--color-text-tertiary);
  }

  /* Toast & Notification Message States */
  .form-status {
    font-size: 0.95rem;
    font-weight: 500;
    margin-top: var(--space-sm);
    display: none;
    animation: fadeIn 0.3s ease;
  }

  .form-status.success {
    display: block;
    color: var(--color-success);
  }

  .form-status.error {
    display: block;
    color: var(--color-critical);
  }

  /* Footer */
  .footer {
    border-top: var(--border-width) solid var(--color-border);
    max-width: 1200px;
    margin: 0 auto;
    padding: var(--space-lg) var(--space-md);
    display: flex;
    flex-direction: column;
    gap: var(--space-md);
    align-items: center;
    font-size: 0.875rem;
    color: var(--color-text-tertiary);
  }

  @media (min-width: 768px) {
    .footer {
      flex-direction: row;
      justify-content: space-between;
    }
  }
}

@layer utilities {
  /* Accessibility: Smooth Reveal on Scroll */
  .reveal-on-scroll {
    opacity: 0;
    transform: translateY(20px);
    transition: opacity 0.6s cubic-bezier(0.16, 1, 0.3, 1), transform 0.6s cubic-bezier(0.16, 1, 0.3, 1);
  }

  .reveal-on-scroll.visible {
    opacity: 1;
    transform: translateY(0);
  }

  /* Animation utilities */
  @keyframes fadeIn {
    from {
      opacity: 0;
    }
    to {
      opacity: 1;
    }
  }

  /* Screen reader only */
  .sr-only {
    position: absolute;
    width: 1px;
    height: 1px;
    padding: 0;
    margin: -1px;
    overflow: hidden;
    clip: rect(0, 0, 0, 0);
    white-space: nowrap;
    border: 0;
  }
}

/* Reduced motion preference */
@media (prefers-reduced-motion: reduce) {
  html {
    scroll-behavior: auto;
  }
  
  .reveal-on-scroll {
    opacity: 1;
    transform: none;
    transition: none;
  }
  
  .terminal-scanner {
    display: none;
  }
  
  .btn, .card {
    transition: none;
  }
  
  .btn:hover, .card:hover {
    transform: none;
  }
}