/* ==========================================================================
   CSS Variables (Color Palette, Fonts, Spacing)
   ========================================================================== */

:root {
  /* Colors */
  --color-primary: #2C5F8A;
  --color-secondary: #4A90D9;
  --color-accent: #F5A623;
  --color-bg: #F8F9FA;
  --color-text: #333333;
  --color-text-secondary: #666666;
  --color-white: #FFFFFF;
  --color-border: #E0E0E0;
  --color-error: #D32F2F;
  --color-success: #388E3C;

  /* Fonts */
  --font-main: system-ui, -apple-system, 'Segoe UI', Roboto, 'Helvetica Neue', Arial, 'Noto Sans', sans-serif, 'Apple Color Emoji', 'Segoe UI Emoji', 'Segoe UI Symbol', 'Noto Color Emoji';

  /* Font sizes */
  --font-size-xs: 0.75rem;    /* 12px */
  --font-size-sm: 0.875rem;   /* 14px */
  --font-size-base: 1rem;     /* 16px */
  --font-size-md: 1.125rem;   /* 18px */
  --font-size-lg: 1.25rem;    /* 20px */
  --font-size-xl: 1.5rem;     /* 24px */
  --font-size-2xl: 2rem;      /* 32px */
  --font-size-3xl: 2.5rem;    /* 40px */
  --font-size-4xl: 3rem;      /* 48px */

  /* Font weights */
  --font-weight-normal: 400;
  --font-weight-medium: 500;
  --font-weight-bold: 700;

  /* Line heights */
  --line-height-tight: 1.2;
  --line-height-base: 1.5;
  --line-height-relaxed: 1.75;

  /* Spacing */
  --spacing-xs: 0.25rem;   /* 4px */
  --spacing-sm: 0.5rem;    /* 8px */
  --spacing-md: 1rem;      /* 16px */
  --spacing-lg: 1.5rem;    /* 24px */
  --spacing-xl: 2rem;      /* 32px */
  --spacing-2xl: 3rem;     /* 48px */
  --spacing-3xl: 4rem;     /* 64px */
  --spacing-4xl: 6rem;     /* 96px */

  /* Border radius */
  --border-radius-sm: 4px;
  --border-radius-md: 8px;
  --border-radius-lg: 12px;
  --border-radius-round: 50%;

  /* Shadows */
  --shadow-sm: 0 1px 3px rgba(0, 0, 0, 0.12);
  --shadow-md: 0 4px 6px rgba(0, 0, 0, 0.1);
  --shadow-lg: 0 10px 25px rgba(0, 0, 0, 0.15);

  /* Transitions */
  --transition-fast: 0.2s ease;
  --transition-base: 0.3s ease;
  --transition-slow: 0.5s ease;

  /* Container max-width */
  --container-max-width: 1200px;

  /* Header height */
  --header-height: 70px;
}

/* ==========================================================================
   Base Styles (Reset & Typography)
   ========================================================================== */

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

html {
  scroll-behavior: smooth;
  -webkit-text-size-adjust: 100%;
}

body {
  font-family: var(--font-main);
  font-size: var(--font-size-base);
  line-height: var(--line-height-base);
  color: var(--color-text);
  background-color: var(--color-bg);
  min-height: 100vh;
  display: flex;
  flex-direction: column;
}

main {
  flex: 1;
  margin-top: var(--header-height);
}

/* Headings */
h1, h2, h3, h4, h5, h6 {
  font-family: var(--font-main);
  font-weight: var(--font-weight-bold);
  line-height: var(--line-height-tight);
  color: var(--color-primary);
  margin-top: 0;
  margin-bottom: var(--spacing-md);
}

h1 {
  font-size: var(--font-size-3xl);
}

h2 {
  font-size: var(--font-size-2xl);
}

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

h4 {
  font-size: var(--font-size-lg);
}

h5 {
  font-size: var(--font-size-md);
}

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

/* Paragraphs */
p {
  margin-top: 0;
  margin-bottom: var(--spacing-md);
  color: var(--color-text);
}

/* Links */
a {
  color: var(--color-secondary);
  text-decoration: none;
  transition: color var(--transition-fast);
}

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

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

/* Lists */
ul, ol {
  margin-top: 0;
  margin-bottom: var(--spacing-md);
  padding-left: var(--spacing-xl);
}

li {
  margin-bottom: var(--spacing-xs);
}

/* Buttons */
button {
  cursor: pointer;
  border: none;
  background: none;
  font-family: inherit;
  font-size: inherit;
}

/* Inputs */
input,
textarea,
select {
  font-family: inherit;
  font-size: inherit;
  line-height: inherit;
}

/* ==========================================================================
   Utility Classes
   ========================================================================== */

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

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

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

.section {
  padding-top: var(--spacing-3xl);
  padding-bottom: var(--spacing-3xl);
}

.section__title {
  text-align: center;
  margin-bottom: var(--spacing-xl);
}

.section__subtitle {
  text-align: center;
  color: var(--color-text-secondary);
  font-size: var(--font-size-md);
  margin-bottom: var(--spacing-2xl);
  max-width: 600px;
  margin-left: auto;
  margin-right: auto;
}

/* Buttons */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: var(--spacing-sm);
  padding: var(--spacing-sm) var(--spacing-xl);
  border-radius: var(--border-radius-md);
  font-size: var(--font-size-base);
  font-weight: var(--font-weight-medium);
  line-height: 1.5;
  text-decoration: none;
  cursor: pointer;
  transition: all var(--transition-base);
  border: 2px solid transparent;
  white-space: nowrap;
}

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

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

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

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

.btn--accent {
  background-color: var(--color-accent);
  color: var(--color-white);
  border-color: var(--color-accent);
}

.btn--accent:hover {
  background-color: #d4951f;
  border-color: #d4951f;
  color: var(--color-white);
}

/* Cards */
.card {
  background-color: var(--color-white);
  border-radius: var(--border-radius-lg);
  box-shadow: var(--shadow-sm);
  overflow: hidden;
  transition: transform var(--transition-base), box-shadow var(--transition-base);
}

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

/* Tags / Badges */
.tag {
  display: inline-block;
  padding: var(--spacing-xs) var(--spacing-sm);
  background-color: var(--color-bg);
  color: var(--color-primary);
  border-radius: var(--border-radius-sm);
  font-size: var(--font-size-xs);
  font-weight: var(--font-weight-medium);
}

/* ==========================================================================
   Responsive Grid System
   ========================================================================== */

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

.grid--2 {
  grid-template-columns: 1fr;
}

.grid--3 {
  grid-template-columns: 1fr;
}

.grid--4 {
  grid-template-columns: 1fr;
}

/* ==========================================================================
   Breakpoints
   ========================================================================== */

/* Tablet: 769px - 1024px */
@media (min-width: 769px) {
  .grid--2 {
    grid-template-columns: repeat(2, 1fr);
  }

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

  .grid--4 {
    grid-template-columns: repeat(2, 1fr);
  }

  h1 {
    font-size: var(--font-size-4xl);
  }

  h2 {
    font-size: var(--font-size-3xl);
  }

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

  .container {
    padding-left: var(--spacing-xl);
    padding-right: var(--spacing-xl);
  }
}

/* Desktop: 1025px+ */
@media (min-width: 1025px) {
  .grid--2 {
    grid-template-columns: repeat(2, 1fr);
  }

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

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

  .container {
    padding-left: var(--spacing-xl);
    padding-right: var(--spacing-xl);
  }

  .section {
    padding-top: var(--spacing-4xl);
    padding-bottom: var(--spacing-4xl);
  }
}

/* ==========================================================================
   Utility: Spinner / Loader
   ========================================================================== */

.spinner {
  display: inline-block;
  width: 40px;
  height: 40px;
  border: 4px solid var(--color-border);
  border-top-color: var(--color-secondary);
  border-radius: var(--border-radius-round);
  animation: spin 0.8s linear infinite;
}

@keyframes spin {
  to {
    transform: rotate(360deg);
  }
}

/* ==========================================================================
   Utility: Visually Hidden (for screen readers)
   ========================================================================== */

.visually-hidden {
  position: absolute;
  width: 1px;
  height: 1px;
  margin: -1px;
  padding: 0;
  overflow: hidden;
  border: 0;
  clip: rect(0 0 0 0);
}

/* ==========================================================================
   Hero Section Styles
   ========================================================================== */

.hero {
  background: linear-gradient(135deg, var(--color-primary) 0%, #1a3d5e 100%);
  color: var(--color-white);
  padding: var(--spacing-3xl) 0;
  text-align: center;
  position: relative;
  overflow: hidden;
}

.hero::before {
  content: '';
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  bottom: 0;
  background: url('../assets/images/hero.jpg') center/cover no-repeat;
  opacity: 0.15;
  z-index: 0;
}

.hero__container {
  position: relative;
  z-index: 1;
}

.hero__title {
  color: var(--color-white);
  font-size: var(--font-size-3xl);
  margin-bottom: var(--spacing-md);
  max-width: 800px;
  margin-left: auto;
  margin-right: auto;
}

.hero__subtitle {
  color: rgba(255, 255, 255, 0.85);
  font-size: var(--font-size-md);
  margin-bottom: var(--spacing-xl);
  max-width: 600px;
  margin-left: auto;
  margin-right: auto;
}

.hero__btn {
  font-size: var(--font-size-md);
  padding: var(--spacing-md) var(--spacing-2xl);
}

/* ==========================================================================
   Featured Practices Section Styles
   ========================================================================== */

.featured {
  background-color: var(--color-white);
}

.featured__card-link {
  display: block;
  text-decoration: none;
  color: inherit;
  height: 100%;
}

.featured__card-link:hover {
  color: inherit;
}

.featured__card-image {
  width: 100%;
  height: 180px;
  object-fit: cover;
  display: block;
}

.featured__card-image--placeholder {
  display: flex;
  align-items: center;
  justify-content: center;
  background: linear-gradient(135deg, var(--color-bg) 0%, #e8ecf0 100%);
}

.featured__card-image-icon {
  font-size: 3rem;
  opacity: 0.5;
}

.featured__card-body {
  padding: var(--spacing-md);
}

.featured__card-tags {
  display: flex;
  flex-wrap: wrap;
  gap: var(--spacing-xs);
  margin-bottom: var(--spacing-sm);
}

.featured__card-title {
  font-size: var(--font-size-lg);
  color: var(--color-primary);
  margin-bottom: var(--spacing-sm);
  line-height: var(--line-height-tight);
}

.featured__card-description {
  font-size: var(--font-size-sm);
  color: var(--color-text-secondary);
  margin-bottom: var(--spacing-md);
  line-height: var(--line-height-base);
}

.featured__card-meta {
  display: flex;
  justify-content: space-between;
  align-items: center;
  gap: var(--spacing-sm);
}

.featured__card-author {
  font-size: var(--font-size-xs);
  color: var(--color-text-secondary);
}

.featured__card-rating {
  display: flex;
  align-items: center;
  gap: 2px;
  flex-shrink: 0;
}

.featured__card-rating .star {
  font-size: var(--font-size-sm);
}

.featured__card-rating-value {
  font-size: var(--font-size-xs);
  color: var(--color-text-secondary);
  margin-left: 4px;
}

/* ==========================================================================
   Statistics Section Styles
   ========================================================================== */

.statistics {
  background: linear-gradient(135deg, var(--color-primary) 0%, #1a3d5e 100%);
  color: var(--color-white);
}

.statistics .section__title {
  color: var(--color-white);
}

.statistics__grid {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: var(--spacing-lg);
  max-width: 800px;
  margin: 0 auto;
}

.statistics__item {
  text-align: center;
  padding: var(--spacing-lg);
}

.statistics__number {
  display: block;
  font-size: var(--font-size-3xl);
  font-weight: var(--font-weight-bold);
  color: var(--color-accent);
  margin-bottom: var(--spacing-sm);
}

.statistics__label {
  display: block;
  font-size: var(--font-size-base);
  color: rgba(255, 255, 255, 0.85);
}

/* ==========================================================================
   CTA Section Styles
   ========================================================================== */

.cta {
  background-color: var(--color-white);
  border-top: 1px solid var(--color-border);
}

.cta .btn {
  font-size: var(--font-size-md);
  padding: var(--spacing-md) var(--spacing-2xl);
}

/* ==========================================================================
   Tag level modifier
   ========================================================================== */

.tag--level {
  background-color: rgba(74, 144, 217, 0.12);
  color: var(--color-secondary);
}

/* ==========================================================================
   Star ratings
   ========================================================================== */

.star {
  display: inline-block;
  font-size: var(--font-size-base);
  line-height: 1;
}

.star--full {
  color: var(--color-accent);
}

.star--half {
  color: var(--color-accent);
  position: relative;
}

.star--empty {
  color: var(--color-border);
}

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

/* ==========================================================================
   Micro-animations
   ========================================================================== */

/* Hero section entrance animation */
.hero__title,
.hero__subtitle,
.hero__btn {
  opacity: 0;
  transform: translateY(20px);
  animation: fadeInUp 0.6s ease forwards;
}

.hero__subtitle {
  animation-delay: 0.2s;
}

.hero__btn {
  animation-delay: 0.4s;
}

@keyframes fadeInUp {
  from {
    opacity: 0;
    transform: translateY(20px);
  }
  to {
    opacity: 1;
    transform: translateY(0);
  }
}

/* Staggered card entrance animation */
.featured__card--anim {
  opacity: 0;
  transform: translateY(30px);
  animation: cardFadeIn 0.5s ease forwards;
  animation-delay: calc(0.1s * var(--card-index, 0));
}

@keyframes cardFadeIn {
  from {
    opacity: 0;
    transform: translateY(30px);
  }
  to {
    opacity: 1;
    transform: translateY(0);
  }
}

/* Scale on hover for cards */
.card {
  transition: transform var(--transition-base), box-shadow var(--transition-base);
}

.card:hover {
  transform: translateY(-6px);
  box-shadow: var(--shadow-lg);
}

/* Button pulse on hover */
.btn--accent:hover {
  transform: translateY(-2px);
  box-shadow: 0 4px 12px rgba(245, 166, 35, 0.35);
}

.btn--primary:hover {
  transform: translateY(-2px);
  box-shadow: 0 4px 12px rgba(74, 144, 217, 0.35);
}

/* Statistics item hover */
.statistics__item {
  transition: transform var(--transition-base);
}

.statistics__item:hover {
  transform: scale(1.05);
}

/* Smooth section entrance on scroll */
.section {
  opacity: 0;
  transform: translateY(20px);
  transition: opacity 0.6s ease, transform 0.6s ease;
}

.section--visible {
  opacity: 1;
  transform: translateY(0);
}

/* Override for first sections to be immediately visible */
.hero {
  opacity: 1;
  transform: none;
}

/* Tags micro-animation */
.tag {
  transition: background-color var(--transition-fast), color var(--transition-fast);
}

.tag:hover {
  background-color: var(--color-secondary);
  color: var(--color-white);
}

/* Rating stars animation */
.star--full,
.star--half {
  transition: transform var(--transition-fast);
}

.star--full:hover,
.star--half:hover {
  transform: scale(1.3);
  color: var(--color-accent);
}