/* ==========================================================================
   AuditHub Landing Page - Main CSS
   CSS Variables, Reset, Base Typography, and Global Styles
   ========================================================================== */

/* --------------------------------------------------------------------------
   CSS Custom Properties (Variables)
   -------------------------------------------------------------------------- */
:root {
  /* Primary Colors */
  --color-primary: #246BFD;
  --color-primary-hover: #1E56CC;
  --color-primary-light: #E8F0FF;
  --color-primary-dark: #1A4FBA;

  /* Text Colors */
  --color-text: #1A1A1A;
  --color-text-secondary: #6B7280;
  --color-text-muted: #9CA3AF;
  --color-text-inverse: #FFFFFF;

  /* Background Colors */
  --color-bg-white: #FFFFFF;
  --color-bg-light: #F9FAFB;
  --color-bg-blue-light: #F0F7FF;
  --color-bg-dark: #1A1A1A;
  --color-bg-dark-secondary: #2D2D2D;

  /* Border Colors */
  --color-border: #E5E7EB;
  --color-border-light: #F3F4F6;
  --color-border-dark: #D1D5DB;

  /* Status Colors */
  --color-success: #12B76A;
  --color-warning: #F79009;
  --color-error: #F04438;
  --color-info: #2E90FA;

  /* Gradients */
  --gradient-primary: linear-gradient(135deg, #246BFD 0%, #1E56CC 100%);
  --gradient-hero: linear-gradient(135deg, #246BFD 0%, #4A90FF 50%, #1E56CC 100%);
  --gradient-cta: linear-gradient(135deg, #246BFD 0%, #1E56CC 100%);

  /* Typography */
  --font-family: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, Oxygen, Ubuntu, sans-serif;
  --font-weight-normal: 400;
  --font-weight-medium: 500;
  --font-weight-semibold: 600;
  --font-weight-bold: 700;

  /* Font Sizes - Desktop */
  --font-size-xs: 0.75rem;    /* 12px */
  --font-size-sm: 0.875rem;   /* 14px */
  --font-size-base: 1rem;     /* 16px */
  --font-size-lg: 1.125rem;   /* 18px */
  --font-size-xl: 1.25rem;    /* 20px */
  --font-size-2xl: 1.5rem;    /* 24px */
  --font-size-3xl: 1.875rem;  /* 30px */
  --font-size-4xl: 2.25rem;   /* 36px */
  --font-size-5xl: 3rem;      /* 48px */

  /* Line Heights */
  --line-height-tight: 1.2;
  --line-height-snug: 1.375;
  --line-height-normal: 1.5;
  --line-height-relaxed: 1.625;

  /* Spacing Scale */
  --spacing-1: 0.25rem;   /* 4px */
  --spacing-2: 0.5rem;    /* 8px */
  --spacing-3: 0.75rem;   /* 12px */
  --spacing-4: 1rem;      /* 16px */
  --spacing-5: 1.25rem;   /* 20px */
  --spacing-6: 1.5rem;    /* 24px */
  --spacing-8: 2rem;      /* 32px */
  --spacing-10: 2.5rem;   /* 40px */
  --spacing-12: 3rem;     /* 48px */
  --spacing-16: 4rem;     /* 64px */
  --spacing-20: 5rem;     /* 80px */
  --spacing-24: 6rem;     /* 96px */

  /* Border Radius */
  --radius-sm: 4px;
  --radius-md: 8px;
  --radius-lg: 12px;
  --radius-xl: 16px;
  --radius-2xl: 24px;
  --radius-full: 9999px;

  /* Shadows */
  --shadow-sm: 0 1px 2px 0 rgba(0, 0, 0, 0.05);
  --shadow-md: 0 4px 6px -1px rgba(0, 0, 0, 0.1), 0 2px 4px -2px rgba(0, 0, 0, 0.1);
  --shadow-lg: 0 10px 15px -3px rgba(0, 0, 0, 0.1), 0 4px 6px -4px rgba(0, 0, 0, 0.1);
  --shadow-xl: 0 20px 25px -5px rgba(0, 0, 0, 0.1), 0 8px 10px -6px rgba(0, 0, 0, 0.1);
  --shadow-header: 0 2px 8px rgba(0, 0, 0, 0.08);

  /* Transitions */
  --transition-fast: 150ms ease;
  --transition-base: 200ms ease;
  --transition-slow: 300ms ease;

  /* Layout */
  --container-max-width: 1280px;
  --container-padding: var(--spacing-6);
  --header-height: 72px;

  /* Z-Index Scale */
  --z-dropdown: 100;
  --z-sticky: 200;
  --z-fixed: 300;
  --z-modal-backdrop: 400;
  --z-modal: 500;
}

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

html {
  font-size: 16px;
  scroll-behavior: smooth;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}

body {
  font-family: var(--font-family);
  font-size: var(--font-size-base);
  font-weight: var(--font-weight-normal);
  line-height: var(--line-height-normal);
  color: var(--color-text);
  background-color: var(--color-bg-white);
  min-height: 100vh;
}

img,
picture,
video,
canvas,
svg {
  display: block;
  max-width: 100%;
  height: auto;
}

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

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

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

ul,
ol {
  list-style: none;
}

h1, h2, h3, h4, h5, h6 {
  font-weight: var(--font-weight-bold);
  line-height: var(--line-height-tight);
  color: var(--color-text);
}

p {
  margin-bottom: var(--spacing-4);
}

p:last-child {
  margin-bottom: 0;
}

/* --------------------------------------------------------------------------
   Typography
   -------------------------------------------------------------------------- */
.h1, h1 {
  font-size: var(--font-size-5xl);
  letter-spacing: -0.02em;
}

.h2, h2 {
  font-size: var(--font-size-4xl);
  letter-spacing: -0.01em;
}

.h3, h3 {
  font-size: var(--font-size-2xl);
}

.h4, h4 {
  font-size: var(--font-size-xl);
}

.h5, h5 {
  font-size: var(--font-size-lg);
}

.h6, h6 {
  font-size: var(--font-size-base);
}

.text-lg {
  font-size: var(--font-size-lg);
}

.text-sm {
  font-size: var(--font-size-sm);
}

.text-xs {
  font-size: var(--font-size-xs);
}

.text-muted {
  color: var(--color-text-muted);
}

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

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

.text-center {
  text-align: center;
}

.text-left {
  text-align: left;
}

.text-right {
  text-align: right;
}

.font-medium {
  font-weight: var(--font-weight-medium);
}

.font-semibold {
  font-weight: var(--font-weight-semibold);
}

.font-bold {
  font-weight: var(--font-weight-bold);
}

/* --------------------------------------------------------------------------
   Layout
   -------------------------------------------------------------------------- */
.container {
  width: 100%;
  max-width: var(--container-max-width);
  margin: 0 auto;
  padding-left: var(--container-padding);
  padding-right: var(--container-padding);
}

.section {
  padding: var(--spacing-16) 0;
}

.section-sm {
  padding: var(--spacing-12) 0;
}

.section-lg {
  padding: var(--spacing-20) 0;
}

/* Background Variations */
.bg-white {
  background-color: var(--color-bg-white);
}

.bg-light {
  background-color: var(--color-bg-light);
}

.bg-blue-light {
  background-color: var(--color-bg-blue-light);
}

.bg-dark {
  background-color: var(--color-bg-dark);
  color: var(--color-text-inverse);
}

.bg-gradient {
  background: var(--gradient-primary);
  color: var(--color-text-inverse);
}

.bg-gradient-hero {
  background: var(--gradient-hero);
  color: var(--color-text-inverse);
}

/* --------------------------------------------------------------------------
   Section Headers
   -------------------------------------------------------------------------- */
.section-header {
  text-align: center;
  max-width: 720px;
  margin: 0 auto var(--spacing-12);
}

.section-header .section-label {
  display: inline-block;
  font-size: var(--font-size-sm);
  font-weight: var(--font-weight-semibold);
  color: var(--color-primary);
  text-transform: uppercase;
  letter-spacing: 0.05em;
  margin-bottom: var(--spacing-3);
}

.section-header .section-title {
  margin-bottom: var(--spacing-4);
}

.section-header .section-description {
  font-size: var(--font-size-lg);
  color: var(--color-text-secondary);
}

/* --------------------------------------------------------------------------
   Responsive Typography
   -------------------------------------------------------------------------- */
@media (max-width: 1023px) {
  :root {
    --font-size-5xl: 2.5rem;    /* 40px */
    --font-size-4xl: 2rem;      /* 32px */
    --font-size-3xl: 1.5rem;    /* 24px */
  }

  .section {
    padding: var(--spacing-12) 0;
  }

  .section-lg {
    padding: var(--spacing-16) 0;
  }
}

@media (max-width: 767px) {
  :root {
    --font-size-5xl: 2rem;      /* 32px */
    --font-size-4xl: 1.75rem;   /* 28px */
    --font-size-3xl: 1.375rem;  /* 22px */
    --container-padding: var(--spacing-4);
  }

  .section {
    padding: var(--spacing-10) 0;
  }

  .section-lg {
    padding: var(--spacing-12) 0;
  }

  .section-header {
    margin-bottom: var(--spacing-8);
  }
}

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

.hidden {
  display: none !important;
}

.overflow-hidden {
  overflow: hidden;
}

/* Focus Styles */
:focus-visible {
  outline: 2px solid var(--color-primary);
  outline-offset: 2px;
}

button:focus-visible,
a:focus-visible {
  outline: 2px solid var(--color-primary);
  outline-offset: 2px;
}

/* Selection */
::selection {
  background-color: var(--color-primary-light);
  color: var(--color-primary-dark);
}

/* --------------------------------------------------------------------------
   Cookie Consent Banner
   -------------------------------------------------------------------------- */
.cookie-banner {
  position: fixed;
  bottom: 0;
  left: 0;
  right: 0;
  background-color: var(--color-bg-dark);
  color: var(--color-text-inverse);
  padding: var(--spacing-4) var(--spacing-6);
  z-index: var(--z-fixed);
  transform: translateY(100%);
  transition: transform var(--transition-slow);
  box-shadow: 0 -4px 20px rgba(0, 0, 0, 0.15);
}

.cookie-banner.visible {
  transform: translateY(0);
}

.cookie-banner-content {
  max-width: var(--container-max-width);
  margin: 0 auto;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: var(--spacing-6);
}

.cookie-banner-text {
  flex: 1;
}

.cookie-banner-text p {
  margin: 0;
  font-size: var(--font-size-sm);
  color: rgba(255, 255, 255, 0.9);
  line-height: var(--line-height-relaxed);
}

.cookie-banner-link {
  color: var(--color-primary-light);
  text-decoration: underline;
  transition: color var(--transition-fast);
}

.cookie-banner-link:hover {
  color: var(--color-text-inverse);
}

.cookie-banner-actions {
  display: flex;
  gap: var(--spacing-3);
  flex-shrink: 0;
}

.cookie-btn-decline {
  color: rgba(255, 255, 255, 0.8);
  border-color: rgba(255, 255, 255, 0.3);
}

.cookie-btn-decline:hover {
  color: var(--color-text-inverse);
  border-color: rgba(255, 255, 255, 0.5);
  background-color: rgba(255, 255, 255, 0.1);
}

.cookie-btn-accept {
  background-color: var(--color-primary);
  color: var(--color-text-inverse);
}

.cookie-btn-accept:hover {
  background-color: var(--color-primary-hover);
}

/* Cookie Banner Responsive */
@media (max-width: 767px) {
  .cookie-banner {
    padding: var(--spacing-4);
  }

  .cookie-banner-content {
    flex-direction: column;
    align-items: stretch;
    gap: var(--spacing-4);
  }

  .cookie-banner-text p {
    text-align: center;
  }

  .cookie-banner-actions {
    flex-direction: column;
    gap: var(--spacing-2);
  }

  .cookie-banner-actions .btn {
    width: 100%;
    justify-content: center;
  }
}