/* ===========================================
   Hylea - Sustainable Product Guide
   Elegant, Nature-Inspired Design System
   =========================================== */

/* CSS Variables - Easy to customize */
:root {
  /* Primary Colors - Soft Sage Greens (from Hylea logo) */
  --color-primary: #5d7a5f;
  --color-primary-light: #7a9b7c;
  --color-primary-dark: #4a6149;

  /* Secondary Colors - Warm Cream/Beige */
  --color-secondary: #d4cfc3;
  --color-secondary-light: #f0ebe3;
  --color-secondary-dark: #b5a998;

  /* Accent Colors - Soft Earth Tones */
  --color-accent: #8fa7b8;
  --color-accent-light: #b5c9d6;

  /* Background Colors */
  --color-bg: #f9f7f4;
  --color-bg-alt: #f3efe9;
  --color-white: #ffffff;

  /* Text Colors */
  --color-text: #3a3a38;
  --color-text-light: #5e5e5c;
  --color-text-muted: #8a8a88;

  /* Risk Level Colors */
  --color-risk-high: #bf5a50;
  --color-risk-medium: #c99558;
  --color-risk-low: #6d9a68;

  /* Typography - More Elegant */
  --font-primary: 'Segoe UI', 'Roboto', 'Helvetica Neue', Arial, sans-serif;
  --font-heading: 'Palatino Linotype', 'Book Antiqua', Palatino, Georgia, serif;

  /* Spacing */
  --spacing-xs: 0.25rem;
  --spacing-sm: 0.5rem;
  --spacing-md: 1rem;
  --spacing-lg: 1.5rem;
  --spacing-xl: 2rem;
  --spacing-2xl: 3rem;
  --spacing-3xl: 4rem;

  /* Border Radius */
  --radius-sm: 4px;
  --radius-md: 8px;
  --radius-lg: 12px;
  --radius-xl: 20px;
  --radius-full: 50%;

  /* Shadows */
  --shadow-sm: 0 1px 3px rgba(0, 0, 0, 0.08);
  --shadow-md: 0 4px 6px rgba(0, 0, 0, 0.1);
  --shadow-lg: 0 10px 20px rgba(0, 0, 0, 0.12);

  /* Container */
  --container-max: 1200px;
  --container-narrow: 800px;
}

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

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

body {
  font-family: var(--font-primary);
  color: var(--color-text);
  background-color: var(--color-bg);
  line-height: 1.6;
  min-height: 100vh;
  display: flex;
  flex-direction: column;
}

main {
  flex: 1;
}

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

a {
  color: var(--color-primary);
  text-decoration: none;
  transition: color 0.2s ease;
}

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

/* Typography */
h1, h2, h3, h4, h5, h6 {
  font-family: var(--font-heading);
  color: var(--color-text);
  line-height: 1.3;
  margin-bottom: var(--spacing-md);
}

h1 {
  font-size: 2.5rem;
  font-weight: 700;
}

h2 {
  font-size: 2rem;
  font-weight: 600;
}

h3 {
  font-size: 1.5rem;
  font-weight: 600;
}

h4 {
  font-size: 1.25rem;
  font-weight: 600;
}

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

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

.container-narrow {
  max-width: var(--container-narrow);
}

/* ===========================================
   Header & Navigation
   =========================================== */
.site-header {
  background-color: var(--color-white);
  box-shadow: var(--shadow-sm);
  position: sticky;
  top: 0;
  z-index: 100;
}

.header-content {
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding: 0 var(--spacing-lg) 0 0;
  max-width: var(--container-max);
  margin: 0 auto;
}

.site-logo {
  display: flex;
  align-items: center;
  gap: var(--spacing-sm);
  font-family: var(--font-heading);
  font-size: 1.75rem;
  font-weight: 700;
  color: var(--color-primary);
}

.site-logo img {
  height: 48px;
  width: auto;
}

.site-logo svg {
  width: 36px;
  height: 36px;
}

.nav-toggle {
  display: none;
  background: none;
  border: none;
  cursor: pointer;
  padding: var(--spacing-sm);
}

.nav-toggle span {
  display: block;
  width: 24px;
  height: 2px;
  background-color: var(--color-text);
  margin: 5px 0;
  transition: all 0.3s ease;
}

.main-nav ul {
  display: flex;
  list-style: none;
  gap: var(--spacing-xl);
}

.main-nav a {
  color: var(--color-text);
  font-weight: 500;
  padding: var(--spacing-sm) 0;
  position: relative;
}

.main-nav a::after {
  content: '';
  position: absolute;
  bottom: 0;
  left: 0;
  width: 0;
  height: 2px;
  background-color: var(--color-primary);
  transition: width 0.3s ease;
}

.main-nav a:hover::after,
.main-nav a.active::after {
  width: 100%;
}

.main-nav a:hover,
.main-nav a.active {
  color: var(--color-primary);
}

/* ===========================================
   Hero Section
   =========================================== */
.hero {
  background: linear-gradient(135deg, var(--color-primary) 0%, var(--color-primary-light) 100%);
  color: var(--color-white);
  padding: var(--spacing-3xl) 0;
  text-align: center;
}

.hero h1 {
  color: var(--color-white);
  font-size: 3rem;
  margin-bottom: var(--spacing-lg);
}

.hero p {
  font-size: 1.25rem;
  opacity: 0.95;
  max-width: 700px;
  margin: 0 auto var(--spacing-xl);
}

.hero-small {
  padding: var(--spacing-2xl) 0;
}

.hero-small h1 {
  font-size: 2.5rem;
  margin-bottom: var(--spacing-sm);
}

/* ===========================================
   Buttons
   =========================================== */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: var(--spacing-sm);
  padding: var(--spacing-md) var(--spacing-xl);
  font-family: var(--font-primary);
  font-size: 1rem;
  font-weight: 600;
  border-radius: var(--radius-lg);
  border: none;
  cursor: pointer;
  transition: all 0.2s ease;
  text-decoration: none;
}

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

.btn-primary:hover {
  background-color: var(--color-accent-light);
  color: var(--color-text);
}

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

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

.btn-outline {
  background-color: transparent;
  border: 2px solid var(--color-primary);
  color: var(--color-primary);
}

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

/* ===========================================
   Cards
   =========================================== */
.card {
  background-color: var(--color-white);
  border-radius: var(--radius-lg);
  box-shadow: var(--shadow-md);
  overflow: hidden;
  transition: transform 0.2s ease, box-shadow 0.2s ease;
}

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

.card-body {
  padding: var(--spacing-lg);
}

.card-title {
  font-size: 1.25rem;
  margin-bottom: var(--spacing-sm);
}

.card-text {
  color: var(--color-text-light);
  margin-bottom: var(--spacing-md);
}

.card-link {
  display: inline-flex;
  align-items: center;
  gap: var(--spacing-xs);
  font-weight: 600;
  color: var(--color-primary);
}

.card-link:hover {
  gap: var(--spacing-sm);
}

/* ===========================================
   Grid Layouts
   =========================================== */
.grid {
  display: grid;
  gap: var(--spacing-xl);
}

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

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

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

/* ===========================================
   Section Styles
   =========================================== */
.section {
  padding: var(--spacing-3xl) 0;
}

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

.section-title {
  text-align: center;
  margin-bottom: var(--spacing-2xl);
}

.section-title h2 {
  margin-bottom: var(--spacing-sm);
}

.section-title p {
  color: var(--color-text-light);
  max-width: 600px;
  margin: 0 auto;
}

/* ===========================================
   Risk Level Indicators
   =========================================== */
.risk-badge {
  display: inline-flex;
  align-items: center;
  gap: var(--spacing-xs);
  padding: var(--spacing-xs) var(--spacing-md);
  border-radius: var(--radius-xl);
  font-size: 0.875rem;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.5px;
}

.risk-high {
  background-color: rgba(196, 69, 54, 0.15);
  color: var(--color-risk-high);
}

.risk-medium {
  background-color: rgba(212, 135, 77, 0.15);
  color: var(--color-risk-medium);
}

.risk-low {
  background-color: rgba(123, 179, 105, 0.15);
  color: var(--color-risk-low);
}

.risk-dot {
  width: 10px;
  height: 10px;
  border-radius: var(--radius-full);
}

.risk-high .risk-dot {
  background-color: var(--color-risk-high);
}

.risk-medium .risk-dot {
  background-color: var(--color-risk-medium);
}

.risk-low .risk-dot {
  background-color: var(--color-risk-low);
}

/* ===========================================
   Search & Filter
   =========================================== */
.search-box {
  position: relative;
  max-width: 500px;
  margin: 0 auto var(--spacing-xl);
}

.search-input {
  width: 100%;
  padding: var(--spacing-md) var(--spacing-lg);
  padding-left: 3rem;
  font-size: 1rem;
  border: 2px solid var(--color-secondary);
  border-radius: var(--radius-xl);
  background-color: var(--color-white);
  transition: border-color 0.2s ease;
}

.search-input:focus {
  outline: none;
  border-color: var(--color-primary);
}

.search-icon {
  position: absolute;
  left: var(--spacing-md);
  top: 50%;
  transform: translateY(-50%);
  color: var(--color-text-muted);
}

.filter-group {
  display: flex;
  flex-wrap: wrap;
  gap: var(--spacing-sm);
  justify-content: center;
  margin-bottom: var(--spacing-xl);
}

.filter-btn {
  padding: var(--spacing-sm) var(--spacing-lg);
  background-color: var(--color-white);
  border: 2px solid var(--color-secondary);
  border-radius: var(--radius-xl);
  font-size: 0.9rem;
  cursor: pointer;
  transition: all 0.2s ease;
}

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

/* ===========================================
   Chemical & Product Lists
   =========================================== */
.item-list {
  display: flex;
  flex-direction: column;
  gap: var(--spacing-md);
}

.list-item {
  display: flex;
  align-items: center;
  gap: var(--spacing-lg);
  padding: var(--spacing-lg);
  background-color: var(--color-white);
  border-radius: var(--radius-lg);
  box-shadow: var(--shadow-sm);
  transition: all 0.2s ease;
}

.list-item:hover {
  box-shadow: var(--shadow-md);
  transform: translateX(4px);
}

.list-item-content {
  flex: 1;
}

.list-item-title {
  font-size: 1.1rem;
  font-weight: 600;
  margin-bottom: var(--spacing-xs);
}

.list-item-desc {
  color: var(--color-text-light);
  font-size: 0.95rem;
  margin: 0;
}

/* ===========================================
   Detail Pages
   =========================================== */
.detail-header {
  background-color: var(--color-bg-alt);
  padding: var(--spacing-2xl) 0;
}

.detail-meta {
  display: flex;
  flex-wrap: wrap;
  gap: var(--spacing-md);
  align-items: center;
  margin-top: var(--spacing-md);
}

.breadcrumb {
  display: flex;
  align-items: center;
  gap: var(--spacing-sm);
  font-size: 0.9rem;
  color: var(--color-text-light);
  margin-bottom: var(--spacing-lg);
}

.breadcrumb a {
  color: var(--color-text-light);
}

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

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

.detail-content {
  padding: var(--spacing-2xl) 0;
}

.info-box {
  background-color: var(--color-bg-alt);
  border-radius: var(--radius-lg);
  padding: var(--spacing-lg);
  margin-bottom: var(--spacing-xl);
}

.info-box h3 {
  font-size: 1.1rem;
  margin-bottom: var(--spacing-md);
  color: var(--color-primary-dark);
}

.info-box ul {
  list-style: none;
  padding: 0;
}

.info-box li {
  padding: var(--spacing-sm) 0;
  padding-left: var(--spacing-lg);
  position: relative;
}

.info-box li::before {
  content: '';
  position: absolute;
  left: 0;
  top: 50%;
  transform: translateY(-50%);
  width: 8px;
  height: 8px;
  border-radius: var(--radius-full);
  background-color: var(--color-primary);
}

.warning-box {
  background-color: rgba(196, 69, 54, 0.08);
  border-left: 4px solid var(--color-risk-high);
}

.warning-box li::before {
  background-color: var(--color-risk-high);
}

.tip-box {
  background-color: rgba(123, 179, 105, 0.1);
  border-left: 4px solid var(--color-risk-low);
}

.tip-box li::before {
  background-color: var(--color-risk-low);
}

/* ===========================================
   Category Cards
   =========================================== */
.category-card {
  text-align: center;
  padding: var(--spacing-xl);
}

.category-icon {
  width: 80px;
  height: 80px;
  margin: 0 auto var(--spacing-lg);
  background-color: var(--color-bg-alt);
  border-radius: var(--radius-full);
  display: flex;
  align-items: center;
  justify-content: center;
}

.category-icon svg {
  width: 40px;
  height: 40px;
  color: var(--color-primary);
}

/* ===========================================
   About Page
   =========================================== */
.about-content {
  display: grid;
  grid-template-columns: 300px 1fr;
  gap: var(--spacing-2xl);
  align-items: start;
}

.profile-image {
  width: 100%;
  border-radius: var(--radius-lg);
  box-shadow: var(--shadow-lg);
}

.profile-placeholder {
  width: 100%;
  aspect-ratio: 1;
  background: linear-gradient(135deg, var(--color-secondary-light) 0%, var(--color-secondary) 100%);
  border-radius: var(--radius-lg);
  display: flex;
  align-items: center;
  justify-content: center;
  color: var(--color-white);
  font-size: 4rem;
}

.credentials {
  display: flex;
  flex-wrap: wrap;
  gap: var(--spacing-sm);
  margin-top: var(--spacing-lg);
}

.credential-tag {
  padding: var(--spacing-xs) var(--spacing-md);
  background-color: var(--color-secondary-light);
  border-radius: var(--radius-md);
  font-size: 0.875rem;
  color: var(--color-text);
}

/* ===========================================
   Contact Form
   =========================================== */
.contact-form {
  max-width: 600px;
  margin: 0 auto;
}

.form-group {
  margin-bottom: var(--spacing-lg);
}

.form-label {
  display: block;
  margin-bottom: var(--spacing-sm);
  font-weight: 600;
  color: var(--color-text);
}

.form-input,
.form-textarea {
  width: 100%;
  padding: var(--spacing-md);
  font-size: 1rem;
  font-family: var(--font-primary);
  border: 2px solid var(--color-secondary);
  border-radius: var(--radius-md);
  background-color: var(--color-white);
  transition: border-color 0.2s ease;
}

.form-input:focus,
.form-textarea:focus {
  outline: none;
  border-color: var(--color-primary);
}

.form-textarea {
  min-height: 150px;
  resize: vertical;
}

/* ===========================================
   Blog
   =========================================== */
.blog-card {
  display: grid;
  grid-template-columns: 200px 1fr;
  gap: var(--spacing-lg);
}

.blog-card-image {
  aspect-ratio: 4/3;
  background-color: var(--color-secondary-light);
  border-radius: var(--radius-md);
  overflow: hidden;
}

.blog-card-image img {
  width: 100%;
  height: 100%;
  object-fit: cover;
}

.blog-meta {
  display: flex;
  gap: var(--spacing-md);
  font-size: 0.875rem;
  color: var(--color-text-muted);
  margin-bottom: var(--spacing-sm);
}

.blog-tags {
  display: flex;
  gap: var(--spacing-sm);
  margin-top: var(--spacing-md);
}

.blog-tag {
  padding: var(--spacing-xs) var(--spacing-sm);
  background-color: var(--color-bg-alt);
  border-radius: var(--radius-sm);
  font-size: 0.8rem;
  color: var(--color-text-light);
}

.blog-post-content {
  max-width: var(--container-narrow);
  margin: 0 auto;
  line-height: 1.8;
}

.blog-post-content h2 {
  margin-top: var(--spacing-2xl);
}

.blog-post-content p {
  margin-bottom: var(--spacing-lg);
}

/* ===========================================
   Footer
   =========================================== */
.site-footer {
  background-color: var(--color-primary-dark);
  color: var(--color-white);
  padding: var(--spacing-2xl) 0;
  margin-top: auto;
}

.footer-content {
  display: grid;
  grid-template-columns: 2fr 1fr 1fr;
  gap: var(--spacing-2xl);
}

.footer-about p {
  opacity: 0.9;
  margin-bottom: var(--spacing-md);
}

.footer-heading {
  font-size: 1.1rem;
  margin-bottom: var(--spacing-lg);
  color: var(--color-white);
}

.footer-links {
  list-style: none;
}

.footer-links li {
  margin-bottom: var(--spacing-sm);
}

.footer-links a {
  color: rgba(255, 255, 255, 0.8);
}

.footer-links a:hover {
  color: var(--color-white);
}

.footer-bottom {
  margin-top: var(--spacing-2xl);
  padding-top: var(--spacing-lg);
  border-top: 1px solid rgba(255, 255, 255, 0.2);
  text-align: center;
  font-size: 0.9rem;
  opacity: 0.8;
}

/* ===========================================
   Utilities
   =========================================== */
.text-center {
  text-align: center;
}

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

.mt-sm { margin-top: var(--spacing-sm); }
.mt-md { margin-top: var(--spacing-md); }
.mt-lg { margin-top: var(--spacing-lg); }
.mt-xl { margin-top: var(--spacing-xl); }
.mt-2xl { margin-top: var(--spacing-2xl); }

.mb-sm { margin-bottom: var(--spacing-sm); }
.mb-md { margin-bottom: var(--spacing-md); }
.mb-lg { margin-bottom: var(--spacing-lg); }
.mb-xl { margin-bottom: var(--spacing-xl); }
.mb-2xl { margin-bottom: var(--spacing-2xl); }

.hidden {
  display: none !important;
}

/* ===========================================
   Loading State
   =========================================== */
.loading {
  display: flex;
  justify-content: center;
  align-items: center;
  padding: var(--spacing-2xl);
}

.loading-spinner {
  width: 40px;
  height: 40px;
  border: 3px solid var(--color-secondary);
  border-top-color: var(--color-primary);
  border-radius: var(--radius-full);
  animation: spin 1s linear infinite;
}

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

/* ===========================================
   Responsive Design
   =========================================== */
@media (max-width: 992px) {
  .grid-4 {
    grid-template-columns: repeat(2, 1fr);
  }

  .footer-content {
    grid-template-columns: 1fr 1fr;
  }

  .footer-about {
    grid-column: 1 / -1;
  }
}

@media (max-width: 768px) {
  html {
    font-size: 15px;
  }

  .nav-toggle {
    display: block;
  }

  .main-nav {
    position: absolute;
    top: 100%;
    left: 0;
    right: 0;
    background-color: var(--color-white);
    box-shadow: var(--shadow-md);
    padding: var(--spacing-lg);
    display: none;
  }

  .main-nav.active {
    display: block;
  }

  .main-nav ul {
    flex-direction: column;
    gap: var(--spacing-md);
  }

  .hero h1 {
    font-size: 2rem;
  }

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

  .about-content {
    grid-template-columns: 1fr;
  }

  .about-content .profile-placeholder {
    max-width: 250px;
    margin: 0 auto;
  }

  .blog-card {
    grid-template-columns: 1fr;
  }

  .footer-content {
    grid-template-columns: 1fr;
    text-align: center;
  }

  .list-item {
    flex-direction: column;
    text-align: center;
  }
}

@media (max-width: 480px) {
  .container {
    padding: 0 var(--spacing-md);
  }

  h1 {
    font-size: 1.75rem;
  }

  h2 {
    font-size: 1.5rem;
  }

  .hero {
    padding: var(--spacing-2xl) 0;
  }

  .section {
    padding: var(--spacing-2xl) 0;
  }

  .btn {
    width: 100%;
  }
}