/* ==========================================
   CSS VARIABLES & RESET
   ========================================== */
:root {
  /* Color Palette */
  --color-charcoal: #2b2d42;
  --color-dark-gray: #1a1a2e;
  --color-soft-pink: #f4a6b8;
  --color-rose: #e88ca6;
  --color-coral: #ff6b9d;
  --color-neon: #ff0080;
  --color-white: #ffffff;
  --color-light-gray: #f8f9fa;
  --color-border: #e1e8ed;

  /* Typography */
  --font-primary: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, 'Helvetica Neue', Arial, sans-serif;
  --font-heading: 'Georgia', serif;

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

  /* Border Radius */
  --radius-sm: 8px;
  --radius-md: 12px;
  --radius-lg: 16px;

  /* Shadows */
  --shadow-sm: 0 2px 8px rgba(0, 0, 0, 0.08);
  --shadow-md: 0 4px 16px rgba(0, 0, 0, 0.12);
  --shadow-lg: 0 8px 24px rgba(0, 0, 0, 0.16);
}

* {
  margin: 0;
  padding: 0;
  box-sizing: border-box;
}

html {
  scroll-behavior: smooth;
}

body {
  font-family: var(--font-primary);
  font-size: 16px;
  line-height: 1.6;
  color: var(--color-charcoal);
  background-color: var(--color-white);
}

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

a {
  text-decoration: none;
  color: inherit;
  transition: all 0.3s ease;
}

ul {
  list-style: none;
}

/* ==========================================
   LAYOUT & CONTAINERS
   ========================================== */
.container {
  max-width: 1200px;
  margin: 0 auto;
  padding: 0 var(--spacing-md);
}

.container-narrow {
  max-width: 800px;
  margin: 0 auto;
  padding: 0 var(--spacing-md);
}

/* ==========================================
   HEADER & NAVIGATION
   ========================================== */
.header {
  background-color: var(--color-white);
  border-bottom: 2px solid var(--color-light-gray);
  padding: var(--spacing-md) 0;
  position: sticky;
  top: 0;
  z-index: 100;
  box-shadow: var(--shadow-sm);
}

.nav {
  display: flex;
  justify-content: space-between;
  align-items: center;
}

.nav-brand .logo {
  font-family: var(--font-heading);
  font-size: 1.75rem;
  font-weight: 700;
  color: var(--color-charcoal);
  letter-spacing: -0.5px;
}

.nav-brand .logo a {
  color: var(--color-charcoal);
}

.nav-links {
  display: flex;
  gap: var(--spacing-lg);
  align-items: center;
}

.nav-link {
  font-weight: 500;
  color: var(--color-charcoal);
  padding: var(--spacing-xs) var(--spacing-sm);
  border-radius: var(--radius-sm);
  transition: all 0.3s ease;
  display: flex;
  align-items: center;
}

.nav-link:hover,
.nav-link.active {
  color: var(--color-coral);
  background-color: rgba(255, 107, 157, 0.1);
}

.nav-social {
  display: flex;
  align-items: center;
  justify-content: center;
  background-color: transparent !important;
}

.nav-social svg {
  display: block;
  transition: all 0.3s ease;
}

.nav-social:hover {
  background-color: transparent !important;
}

.nav-social:hover svg {
  stroke: var(--color-coral);
  transform: scale(1.1);
}

/* Hamburger Menu */
.hamburger {
  display: none;
  flex-direction: column;
  gap: 5px;
  background: none;
  border: none;
  cursor: pointer;
  padding: 0.5rem;
  z-index: 101;
}

.hamburger-line {
  width: 28px;
  height: 3px;
  background-color: var(--color-charcoal);
  border-radius: 2px;
  transition: all 0.3s ease;
}

.hamburger.active .hamburger-line:nth-child(1) {
  transform: rotate(45deg) translate(8px, 8px);
}

.hamburger.active .hamburger-line:nth-child(2) {
  opacity: 0;
}

.hamburger.active .hamburger-line:nth-child(3) {
  transform: rotate(-45deg) translate(7px, -7px);
}

/* ==========================================
   HERO SECTION
   ========================================== */
.hero {
  background: linear-gradient(135deg, var(--color-charcoal) 0%, var(--color-dark-gray) 100%);
  color: var(--color-white);
  padding: var(--spacing-2xl) 0;
  text-align: center;
}

.hero-content {
  max-width: 700px;
  margin: 0 auto;
}

.hero-title {
  font-family: var(--font-heading);
  font-size: 3rem;
  font-weight: 700;
  margin-bottom: var(--spacing-md);
  line-height: 1.2;
  letter-spacing: -1px;
}

.hero-subtitle {
  font-size: 1.25rem;
  margin-bottom: var(--spacing-lg);
  color: rgba(255, 255, 255, 0.9);
  line-height: 1.6;
}

/* ==========================================
   BUTTONS
   ========================================== */
.btn {
  display: inline-block;
  padding: 0.875rem 2rem;
  border-radius: var(--radius-lg);
  font-weight: 600;
  font-size: 1rem;
  cursor: pointer;
  border: none;
  transition: all 0.3s ease;
  text-align: center;
}

.btn-primary {
  background: linear-gradient(135deg, var(--color-coral) 0%, var(--color-neon) 100%);
  color: var(--color-white);
  box-shadow: var(--shadow-md);
}

.btn-primary:hover {
  transform: translateY(-2px);
  box-shadow: var(--shadow-lg);
}

/* ==========================================
   CATEGORY FILTER
   ========================================== */
.category-filter {
  padding: var(--spacing-xl) 0;
  background-color: var(--color-light-gray);
}

.section-title {
  font-family: var(--font-heading);
  font-size: 2rem;
  font-weight: 700;
  text-align: center;
  margin-bottom: var(--spacing-lg);
  color: var(--color-charcoal);
}

.category-buttons {
  display: flex;
  flex-wrap: wrap;
  gap: var(--spacing-sm);
  justify-content: center;
  max-width: 900px;
  margin: 0 auto;
}

.category-btn {
  padding: 0.75rem 1.5rem;
  border: 2px solid var(--color-border);
  background-color: var(--color-white);
  color: var(--color-charcoal);
  border-radius: var(--radius-lg);
  font-weight: 600;
  font-size: 0.95rem;
  cursor: pointer;
  transition: all 0.3s ease;
}

.category-btn:hover {
  border-color: var(--color-coral);
  color: var(--color-coral);
  transform: translateY(-2px);
}

.category-btn.active {
  background: linear-gradient(135deg, var(--color-coral) 0%, var(--color-neon) 100%);
  border-color: var(--color-coral);
  color: var(--color-white);
  box-shadow: var(--shadow-md);
}

/* ==========================================
   POSTS SECTION
   ========================================== */
.posts-section {
  padding: var(--spacing-2xl) 0;
}

.posts-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(320px, 1fr));
  gap: var(--spacing-lg);
  margin-top: var(--spacing-lg);
}

/* ==========================================
   POST CARDS
   ========================================== */
.post-card {
  background-color: var(--color-white);
  border-radius: var(--radius-md);
  padding: var(--spacing-lg);
  box-shadow: var(--shadow-sm);
  transition: all 0.3s ease;
  border: 1px solid var(--color-border);
  display: flex;
  flex-direction: column;
}

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

.post-card-header {
  display: flex;
  justify-content: space-between;
  align-items: center;
  margin-bottom: var(--spacing-sm);
}

.post-category {
  font-size: 0.75rem;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.5px;
  color: var(--color-coral);
  background-color: rgba(255, 107, 157, 0.1);
  padding: 0.25rem 0.75rem;
  border-radius: var(--radius-sm);
}

.post-reading-time {
  font-size: 0.875rem;
  color: #6c757d;
}

.post-card-title {
  font-family: var(--font-heading);
  font-size: 1.375rem;
  font-weight: 700;
  margin-bottom: var(--spacing-sm);
  line-height: 1.3;
  color: var(--color-charcoal);
}

.post-card-excerpt {
  font-size: 0.95rem;
  color: #495057;
  margin-bottom: var(--spacing-md);
  line-height: 1.6;
  flex-grow: 1;
}

.post-card-footer {
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding-top: var(--spacing-sm);
  border-top: 1px solid var(--color-border);
}

.post-date {
  font-size: 0.875rem;
  color: #6c757d;
}

.post-read-more {
  font-weight: 600;
  color: var(--color-coral);
  font-size: 0.95rem;
  transition: all 0.3s ease;
}

.post-read-more:hover {
  color: var(--color-neon);
  transform: translateX(4px);
}

/* ==========================================
   NO RESULTS MESSAGE
   ========================================== */
.no-results {
  text-align: center;
  padding: var(--spacing-2xl) 0;
}

.no-results p {
  font-size: 1.125rem;
  color: #6c757d;
  margin-bottom: var(--spacing-md);
}

/* ==========================================
   CATEGORY PAGE
   ========================================== */
.category-header {
  background-color: var(--color-light-gray);
  padding: var(--spacing-xl) 0;
  text-align: center;
}

.breadcrumb {
  font-size: 0.875rem;
  color: #6c757d;
  margin-bottom: var(--spacing-sm);
}

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

.breadcrumb a:hover {
  text-decoration: underline;
}

.category-title {
  font-family: var(--font-heading);
  font-size: 2.5rem;
  font-weight: 700;
  margin-bottom: var(--spacing-xs);
  color: var(--color-charcoal);
}

.category-count {
  font-size: 1rem;
  color: #6c757d;
}

/* ==========================================
   SINGLE POST PAGE
   ========================================== */
.post-header {
  background-color: var(--color-light-gray);
  padding: var(--spacing-xl) 0;
}

.post-meta-top {
  display: flex;
  gap: var(--spacing-sm);
  margin-bottom: var(--spacing-sm);
}

.post-title {
  font-family: var(--font-heading);
  font-size: 2.75rem;
  font-weight: 700;
  line-height: 1.2;
  margin-bottom: var(--spacing-sm);
  color: var(--color-charcoal);
}

.post-meta {
  font-size: 0.95rem;
  color: #6c757d;
}

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

.post-content h1 {
  font-family: var(--font-heading);
  font-size: 2.5rem;
  font-weight: 700;
  margin-bottom: var(--spacing-lg);
  line-height: 1.2;
  color: var(--color-charcoal);
}

.post-content h2 {
  font-family: var(--font-heading);
  font-size: 2rem;
  font-weight: 700;
  margin-top: var(--spacing-xl);
  margin-bottom: var(--spacing-md);
  color: var(--color-charcoal);
}

.post-content h3 {
  font-size: 1.5rem;
  font-weight: 700;
  margin-top: var(--spacing-lg);
  margin-bottom: var(--spacing-sm);
  color: var(--color-charcoal);
}

.post-content p {
  font-size: 1.125rem;
  line-height: 1.8;
  margin-bottom: var(--spacing-md);
  color: #495057;
}

.post-content ul,
.post-content ol {
  margin-left: var(--spacing-lg);
  margin-bottom: var(--spacing-md);
}

.post-content li {
  font-size: 1.125rem;
  line-height: 1.8;
  margin-bottom: var(--spacing-xs);
  color: #495057;
  list-style: disc;
}

.post-content ol li {
  list-style: decimal;
}

.post-content strong {
  font-weight: 700;
  color: var(--color-charcoal);
}

.post-content em {
  font-style: italic;
}

/* ==========================================
   RELATED POSTS
   ========================================== */
.related-posts {
  background-color: var(--color-light-gray);
  padding: var(--spacing-2xl) 0;
}

/* ==========================================
   BACK TO TOP BUTTON
   ========================================== */
.back-to-top {
  position: fixed;
  bottom: 2rem;
  right: 2rem;
  width: 50px;
  height: 50px;
  background: linear-gradient(135deg, var(--color-coral) 0%, var(--color-neon) 100%);
  color: var(--color-white);
  border: none;
  border-radius: 50%;
  font-size: 1.5rem;
  cursor: pointer;
  box-shadow: var(--shadow-md);
  opacity: 0;
  visibility: hidden;
  transition: all 0.3s ease;
  z-index: 99;
}

.back-to-top.visible {
  opacity: 1;
  visibility: visible;
}

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

/* ==========================================
   FOOTER
   ========================================== */
.footer {
  background-color: var(--color-charcoal);
  color: var(--color-white);
  padding: var(--spacing-xl) 0;
  text-align: center;
}

.footer-text {
  font-size: 0.95rem;
  margin-bottom: var(--spacing-xs);
  color: rgba(255, 255, 255, 0.8);
}

.footer-tagline {
  font-family: var(--font-heading);
  font-size: 1.125rem;
  font-weight: 600;
  color: var(--color-soft-pink);
}

/* ==========================================
   RESPONSIVE DESIGN
   ========================================== */
@media (max-width: 768px) {
  /* Navigation Mobile */
  .hamburger {
    display: flex;
  }

  .nav-links {
    position: fixed;
    top: 0;
    right: -100%;
    width: 280px;
    height: 100vh;
    background-color: var(--color-white);
    flex-direction: column;
    padding: 5rem 2rem 2rem;
    box-shadow: var(--shadow-lg);
    transition: right 0.3s ease;
    gap: 0;
    z-index: 100;
  }

  .nav-links.active {
    right: 0;
  }

  .nav-links li {
    width: 100%;
    border-bottom: 1px solid var(--color-border);
  }

  .nav-links li:last-child {
    border-bottom: none;
  }

  .nav-link {
    display: block;
    width: 100%;
    padding: var(--spacing-md);
    font-size: 1rem;
    text-align: left;
  }

  .nav-social {
    display: flex;
    align-items: center;
    gap: 0.5rem;
  }

  .nav-social::before {
    content: 'Instagram';
    font-weight: 500;
  }

  /* Hero */
  .hero-title {
    font-size: 2rem;
  }

  .hero-subtitle {
    font-size: 1rem;
  }

  .section-title {
    font-size: 1.5rem;
  }

  .category-buttons {
    flex-direction: column;
  }

  .category-btn {
    width: 100%;
  }

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

  .post-title {
    font-size: 2rem;
  }

  .post-content h1 {
    font-size: 1.75rem;
  }

  .post-content h2 {
    font-size: 1.5rem;
  }

  .post-content h3 {
    font-size: 1.25rem;
  }

  .post-content p,
  .post-content li {
    font-size: 1rem;
  }

  .back-to-top {
    bottom: 1rem;
    right: 1rem;
    width: 45px;
    height: 45px;
  }
}

@media (max-width: 480px) {
  .hero-title {
    font-size: 1.75rem;
  }

  .hero-subtitle {
    font-size: 0.95rem;
  }

  .btn {
    padding: 0.75rem 1.5rem;
    font-size: 0.95rem;
  }

  .post-card {
    padding: var(--spacing-md);
  }

  .post-card-title {
    font-size: 1.125rem;
  }
}