:root {
  --color-primary: #20216e;
  --color-primary-dark: #1a1a52;
  --color-accent: #ffffff;
  --color-background: #f8f9fa;
  --color-secondary: #e9ecef;
  --color-success: #28a745;
  --color-warning: #ffc107;
  --color-danger: #dc3545;
  --color-text: #212529;
  --color-text-secondary: #6c757d;
  --color-border: #e0e0e0;

  --spacing-xs: 4px;
  --spacing-sm: 8px;
  --spacing-md: 16px;
  --spacing-lg: 24px;
  --spacing-xl: 32px;
  --spacing-2xl: 48px;
  --spacing-3xl: 64px;

  --radius-sm: 4px;
  --radius-md: 8px;
  --radius-lg: 12px;
  --radius-base: 8px;

  --shadow-md: 0 4px 6px rgba(0, 0, 0, 0.1);
  --shadow-lg: 0 10px 15px rgba(0, 0, 0, 0.15);

  --font-family: 'Inter', -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, sans-serif;
  --font-family-mono: "Courier New", monospace;

  --font-size-sm: 0.875rem;
  --font-size-md: 1rem;
  --font-size-lg: 1.125rem;
  --font-size-xl: 1.25rem;
  --font-size-2xl: 1.5rem;
  --font-size-3xl: 1.75rem;
  --font-size-4xl: 2rem;
  --font-size-5xl: 2.5rem;

  --font-weight-regular: 400;
  --font-weight-medium: 500;
  --font-weight-semibold: 600;
  --font-weight-bold: 700;
  --line-height-tight: 1.2;
  --line-height-normal: 1.5;
  --letter-spacing: -0.025em;

  --duration-fast: 150ms;
  --duration-normal: 250ms;
  --ease-standard: cubic-bezier(0.4, 0, 0.2, 1);

  --container-sm: 640px;
  --container-md: 768px;
  --container-lg: 1024px;
  --container-xl: 1280px;
}

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

html, body {
  font-family: var(--font-family);
  color: var(--color-text);
  background: var(--color-background);
  line-height: var(--line-height-normal);
  scroll-behavior: smooth;
  position: relative;
  min-height: 100vh;
  display: flex;
  flex-direction: column;
}

body::before {
  content: '';
  position: fixed;
  inset: 0;
  margin: auto;
  width: 500px;
  height: 500px;
  background-image: url('/images/logo.png'); /* Ensure you place a logo.png in the root/images folder, or remove this URL */
  background-repeat: no-repeat;
  background-position: center;
  background-size: contain;
  opacity: 0.05;
  z-index: 0;
  pointer-events: none;
}

a {
  color: var(--color-primary);
  text-decoration: none;
  transition: color var(--duration-fast) var(--ease-standard);
}

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

.container {
  width: 100%;
  max-width: var(--container-md);
  margin: 0 auto;
  padding: 0 var(--spacing-lg);
  position: relative;
  z-index: 1;
}

/* Main Content */
.page-content {
  flex: 1;
  padding: var(--spacing-3xl) var(--spacing-lg);
}

/* Typography */
h1, h2, h3, h4 {
  color: var(--color-primary-dark);
  line-height: var(--line-height-tight);
  margin-bottom: var(--spacing-md);
  letter-spacing: var(--letter-spacing);
}

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

/* Post Cards (Home Page) */
.section-title {
  font-size: var(--font-size-2xl);
  margin-bottom: var(--spacing-xl);
  border-bottom: 2px solid var(--color-secondary);
  padding-bottom: var(--spacing-sm);
}

.post-list {
  display: flex;
  flex-direction: column;
  gap: var(--spacing-lg);
}

.post-card {
  background: var(--color-accent);
  padding: var(--spacing-lg);
  border-radius: var(--radius-lg);
  box-shadow: var(--shadow-md);
  border: 1px solid var(--color-border);
  transition: transform var(--duration-fast) var(--ease-standard), box-shadow var(--duration-fast) var(--ease-standard);
}

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

.post-meta {
  font-size: var(--font-size-sm);
  color: var(--color-text-secondary);
  display: block;
  margin-bottom: var(--spacing-sm);
  text-transform: uppercase;
  letter-spacing: 0.05em;
  font-weight: var(--font-weight-semibold);
}

.post-title {
  font-size: var(--font-size-xl);
  margin-bottom: var(--spacing-xs);
}

.post-description {
  color: var(--color-text-secondary);
  margin-bottom: var(--spacing-md);
}

.post-tags {
  display: flex;
  gap: var(--spacing-sm);
  flex-wrap: wrap;
}

.tag {
  background: var(--color-secondary);
  color: var(--color-primary-dark);
  padding: 2px 10px;
  border-radius: 20px;
  font-size: var(--font-size-sm);
  font-weight: var(--font-weight-medium);
}

/* Post Content (Article Page) */
.post-header {
  margin-bottom: var(--spacing-2xl);
  text-align: center;
}

.post-page-title {
  font-size: var(--font-size-4xl);
}

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

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

.post-body code {
  background: var(--color-secondary);
  padding: 2px 6px;
  border-radius: var(--radius-sm);
  font-family: var(--font-family-mono);
  font-size: 0.9em;
}

.post-body pre {
  background: var(--color-primary-dark);
  color: var(--color-accent);
  padding: var(--spacing-md);
  border-radius: var(--radius-md);
  overflow-x: auto;
  margin-bottom: var(--spacing-lg);
}

.post-body pre code {
  background: transparent;
  color: inherit;
  padding: 0;
}

/* Header */

.header {
  background: var(--color-accent);
  color: var(--color-primary-dark);
  padding: var(--spacing-lg) var(--spacing-xl);
  display: flex;
  align-items: center;
  justify-content: space-between;
  box-shadow: var(--shadow-md);
  position: sticky;
  top: 0;
  z-index: 100;
  transition: background-color var(--duration-normal) var(--ease-standard), box-shadow var(--duration-normal) var(--ease-standard);
}

.header__logo-link {
  display: flex;
  align-items: center;
  gap: var(--spacing-md);
  text-decoration: none;
  color: inherit;
}

.header__logo {
  height: 60px;
  width: auto;
  transition: transform var(--duration-normal) var(--ease-standard);
}

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

.header__name-image {
  height: 50px;
  width: auto;
  transition: transform var(--duration-normal) var(--ease-standard);
}

.header__name-image:hover {
  transform: scale(1.05);
}

.header__nav {
  flex-grow: 1;
  display: flex;
  justify-content: center;
}

.header__nav-list {
  display: flex;
  list-style: none;
  gap: var(--spacing-xl);
  margin: 0;
  padding: 0;
}

.header__nav-link {
  color: var(--color-primary-dark);
  text-decoration: none;
  font-size: var(--font-size-lg);
  font-weight: var(--font-weight-medium);
  padding: var(--spacing-sm) 0;
  position: relative;
  transition: color var(--duration-normal) var(--ease-standard);
}

.header__nav-link::after {
  content: "";
  position: absolute;
  left: 0;
  bottom: 0;
  width: 100%;
  height: 2px;
  background-color: var(--color-primary-dark);
  transform: scaleX(0);
  transition: transform var(--duration-normal) var(--ease-standard);
}

.header__nav-link:hover::after,
.header__nav-link.active::after {
  transform: scaleX(1);
}

.header__nav-toggle {
  display: none;
  flex-direction: column;
  gap: var(--spacing-xs);
  background: none;
  border: none;
  cursor: pointer;
  padding: var(--spacing-sm);
}

.header__nav-toggle-icon {
  width: 24px;
  height: 3px;
  background: var(--color-primary-dark);
  border-radius: var(--radius-sm);
  transition: all var(--duration-normal) var(--ease-standard);
}

.header__nav-toggle--active .header__nav-toggle-icon:nth-child(1) {
  transform: translateY(7px) rotate(45deg);
}

.header__nav-toggle--active .header__nav-toggle-icon:nth-child(2) {
  opacity: 0;
}

.header__nav-toggle--active .header__nav-toggle-icon:nth-child(3) {
  transform: translateY(-7px) rotate(-45deg);
}

/* Footer */
.footer {
  background: var(--color-accent);
  color: var(--color-primary-dark);
  padding: var(--spacing-xl) var(--spacing-lg);
  text-align: center;
  border-top: 1px solid var(--color-border);
}

.footer__content {
  max-width: var(--container-md);
  margin: 0 auto;
}

.footer__logo {
  height: 40px;
  margin-bottom: var(--spacing-md);
  transition: transform var(--duration-normal) var(--ease-standard);
}

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

.footer__text {
  font-size: var(--font-size-md);
  line-height: var(--line-height-normal);
  opacity: 0.8;
}

.footer__text a {
  color: var(--color-primary-dark);
  text-decoration: underline;
  transition: opacity var(--duration-normal) var(--ease-standard);
}

.footer__text a:hover {
  opacity: 1;
}

/* Profile / About specific */
.profile-intro {
  font-size: var(--font-size-xl);
  color: var(--color-primary);
  font-weight: var(--font-weight-medium);
  margin-bottom: var(--spacing-xl);
}