/* ===============
   ROOT VARIABLES
   =============== */
:root {
  --color-white: #FFFFFF;
  --color-black: #000000;
  --color-gray: #E0E0E0;
  --color-light-gray: #F8F8F8;
  --font-primary: 'Montserrat', sans-serif;
  --font-heading: 'Helvetica', Arial, sans-serif;
  --font-weight-light: 300;
  --font-weight-normal: 400;
  --font-weight-bold: 700;
  --spacing-small: 10px;
  --spacing-medium: 20px;
  --spacing-large: 40px;
  --spacing-xlarge: 60px;
  --border-radius: 12px;
  --transition: 0.3s ease;
}

/* ===============
   RESET & TYPOGRAPHY
   =============== */
* {
  margin: 0;
  padding: 0;
  box-sizing: border-box;
}

body {
  background-color: var(--color-white);
  color: var(--color-black);
  font-family: var(--font-primary);
  font-weight: var(--font-weight-normal);
  line-height: 1.7;
  opacity: 1;
  transition: opacity 0.6s ease;
}

body.fade-out {
  opacity: 0;
}

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

/* ===============
   HEADER (Reused from your design)
   =============== */
header {
    display: flex;
    flex-direction: column;
    align-items: center;
    padding: var(--spacing-medium) 5%;
    background-color: var(--color-white);
    border-bottom: 1px solid var(--color-gray);
    position: sticky;
    top: 0;
    z-index: 100;
    backdrop-filter: blur(5px);
    transition: background var(--transition-fast);
}

.logo {
    display: flex;
    flex-direction: column;
    align-items: center;
    margin-bottom: var(--spacing-medium);
}

.logo .heading {
    font-size: clamp(12px, 2.5vw, 14px);
    text-align: center;
    line-height: 1.3;
}

.logo-divider {
    width: 100%;
    height: 1px;
    background-color: var(--color-black);
    margin: var(--spacing-small) 0;
}

nav ul {
    display: flex;
    flex-wrap: wrap;
    justify-content: center;
    list-style: none;
    gap: var(--spacing-small);
}

nav li {
    margin: 0;
}

nav a {
    text-decoration: none;
    color: var(--color-black);
    font-family: var(--font-heading);
    font-weight: var(--font-weight-normal);
    font-size: clamp(11px, 2.5vw, 14px);
    padding: var(--spacing-small) var(--spacing-medium);
    border-radius: var(--border-radius-small);
    transition: all var(--transition-fast);
    position: relative;
}

nav a:hover,
nav a:focus {
    background-color: var(--color-light-gray);
    transform: translateY(-1px);
}

nav a.active {
    background-color: var(--color-black);
    color: var(--color-white);
}

/* ===============
   HEADER (Reuse your navbar)
   =============== */
/* ... (include your full working header CSS here) ... */
/* For brevity, assume it's already defined */

/* ===============
   BLOG DETAIL STYLES
   =============== */
.blog-detail {
  padding: var(--spacing-large) 5%;
  max-width: 900px;
  margin: 0 auto;
}

.post-header {
  margin-bottom: var(--spacing-large);
  text-align: center;
}

.post-date {
  display: inline-block;
  font-size: 0.95rem;
  color: #777;
  margin-bottom: var(--spacing-medium);
}

.post-title {
  font-size: clamp(1.8rem, 4vw, 2.5rem);
  margin: 0;
  color: var(--color-black);
}

.hero-image-container {
  margin: var(--spacing-xlarge) 0;
  border-radius: var(--border-radius);
  overflow: hidden;
  box-shadow: 0 4px 20px rgba(0,0,0,0.08);
}

.hero-image-container img {
  width: 100%;
  height: auto;
  display: block;
}

.post-content {
  font-size: 1.05rem;
  color: #333;
}

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

.post-content h2 {
  font-size: 1.5rem;
  margin: var(--spacing-xlarge) 0 var(--spacing-medium) 0;
  position: relative;
  padding-bottom: var(--spacing-small);
}

.post-content h2::after {
  content: '';
  display: block;
  width: 40px;
  height: 2px;
  background: var(--color-black);
  margin-top: var(--spacing-small);
}

/* ===============
   MOBILE RESPONSIVE
   =============== */
@media (max-width: 768px) {
  .blog-detail {
    padding: var(--spacing-large) 5%;
  }

  .post-title {
    font-size: 1.8rem;
  }

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