/* ============================================
   MY BLOG - MINIMAL CLEAN DESIGN
   Inspired by paulstamatiou.com
   ============================================ */

/* CSS Variables for Theming */
:root {
  /* Light Mode (Default) */
  --color-bg: #fafafa;
  --color-bg-secondary: #ffffff;
  --color-text: #1a1a1a;
  --color-text-secondary: #666666;
  --color-text-muted: #999999;
  --color-border: #e5e5e5;
  --color-border-light: #f0f0f0;
  --color-accent: #333333;
  --color-link: #1a1a1a;
  --color-link-hover: #666666;
  --color-nav-bg: #ffffff;
  --color-overlay: rgba(0, 0, 0, 0.3);

  /* Typography */
  --font-serif: 'Lora', Georgia, 'Times New Roman', serif;
  --font-sans: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;

  /* Spacing */
  --spacing-xs: 0.5rem;
  --spacing-sm: 1rem;
  --spacing-md: 1.5rem;
  --spacing-lg: 2rem;
  --spacing-xl: 3rem;
  --spacing-xxl: 5rem;

  /* Layout */
  --max-width: 720px;
  --nav-width: 280px;
  --top-bar-height: 60px;

  /* Transitions */
  --transition-fast: 0.15s ease;
  --transition-normal: 0.3s ease;
  --transition-slow: 0.5s ease;
}

/* Dark Mode */
[data-theme="dark"] {
  --color-bg: #121212;
  --color-bg-secondary: #1e1e1e;
  --color-text: #e8e8e8;
  --color-text-secondary: #a0a0a0;
  --color-text-muted: #707070;
  --color-border: #2a2a2a;
  --color-border-light: #1f1f1f;
  --color-accent: #ffffff;
  --color-link: #e8e8e8;
  --color-link-hover: #a0a0a0;
  --color-nav-bg: #1a1a1a;
  --color-overlay: rgba(0, 0, 0, 0.6);
}

/* ============================================
   RESET & BASE
   ============================================ */

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

html {
  font-size: 16px;
  scroll-behavior: smooth;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}

body {
  font-family: var(--font-sans);
  font-size: 1rem;
  line-height: 1.7;
  color: var(--color-text);
  background-color: var(--color-bg);
  transition: background-color var(--transition-normal), color var(--transition-normal);
  min-height: 100vh;
}

a {
  color: var(--color-link);
  text-decoration: none;
  transition: color var(--transition-fast);
}

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

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

/* ============================================
   TYPOGRAPHY
   ============================================ */

h1,
h2,
h3,
h4,
h5,
h6 {
  font-family: var(--font-serif);
  font-weight: 500;
  line-height: 1.3;
  color: var(--color-text);
}

h1 {
  font-size: 3rem;
  letter-spacing: -0.02em;
}

h2 {
  font-size: 2rem;
  letter-spacing: -0.01em;
}

h3 {
  font-size: 1.5rem;
}

h4 {
  font-size: 1.25rem;
}

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

/* ============================================
   TOP BAR
   ============================================ */

.top-bar {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  height: var(--top-bar-height);
  background-color: var(--color-bg-secondary);
  border-bottom: 1px solid var(--color-border);
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 0 var(--spacing-lg);
  z-index: 100;
  transition: background-color var(--transition-normal), border-color var(--transition-normal);
}

.top-bar__left {
  display: flex;
  align-items: center;
  gap: var(--spacing-md);
}

.menu-toggle {
  background: none;
  border: none;
  cursor: pointer;
  padding: var(--spacing-xs);
  display: flex;
  flex-direction: column;
  justify-content: center;
  align-items: center;
  gap: 5px;
  width: 32px;
  height: 32px;
}

.menu-toggle span {
  display: block;
  width: 20px;
  height: 2px;
  background-color: var(--color-text);
  transition: transform var(--transition-normal), opacity var(--transition-normal), background-color var(--transition-normal);
}

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

.menu-toggle.active span:nth-child(2) {
  opacity: 0;
}

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

.logo {
  font-family: var(--font-serif);
  font-size: 1.25rem;
  font-weight: 500;
  color: var(--color-text);
  letter-spacing: -0.01em;
}

.logo:hover {
  color: var(--color-text);
}

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

.top-nav {
  display: flex;
  gap: var(--spacing-lg);
}

.top-nav a {
  font-size: 0.875rem;
  color: var(--color-text-secondary);
  text-transform: uppercase;
  letter-spacing: 0.05em;
  font-weight: 500;
}

.top-nav a:hover {
  color: var(--color-text);
}

/* Dark Mode Toggle */
.theme-toggle {
  background: none;
  border: none;
  cursor: pointer;
  padding: var(--spacing-xs);
  display: flex;
  align-items: center;
  justify-content: center;
  width: 36px;
  height: 36px;
  border-radius: 50%;
  transition: background-color var(--transition-fast);
}

.theme-toggle:hover {
  background-color: var(--color-border-light);
}

.theme-toggle svg {
  width: 20px;
  height: 20px;
  fill: var(--color-text);
  transition: fill var(--transition-normal);
}

.theme-toggle .icon-moon {
  display: block;
}

.theme-toggle .icon-sun {
  display: none;
}

[data-theme="dark"] .theme-toggle .icon-moon {
  display: none;
}

[data-theme="dark"] .theme-toggle .icon-sun {
  display: block;
}

/* ============================================
   SIDE NAVIGATION
   ============================================ */

.side-nav-overlay {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  bottom: 0;
  background-color: var(--color-overlay);
  opacity: 0;
  visibility: hidden;
  z-index: 150;
  transition: opacity var(--transition-normal), visibility var(--transition-normal);
}

.side-nav-overlay.active {
  opacity: 1;
  visibility: visible;
}

.side-nav {
  position: fixed;
  top: 0;
  left: 0;
  bottom: 0;
  width: var(--nav-width);
  background-color: var(--color-nav-bg);
  border-right: 1px solid var(--color-border);
  z-index: 200;
  transform: translateX(-100%);
  transition: transform var(--transition-normal), background-color var(--transition-normal), border-color var(--transition-normal);
  overflow-y: auto;
}

.side-nav.active {
  transform: translateX(0);
}

.side-nav__header {
  padding: var(--spacing-lg);
  border-bottom: 1px solid var(--color-border);
  display: flex;
  align-items: center;
  justify-content: space-between;
}

.side-nav__close {
  background: none;
  border: none;
  cursor: pointer;
  padding: var(--spacing-xs);
  display: flex;
  align-items: center;
  justify-content: center;
}

.side-nav__close svg {
  width: 24px;
  height: 24px;
  stroke: var(--color-text);
  transition: stroke var(--transition-normal);
}

.side-nav__content {
  padding: var(--spacing-lg);
}

.side-nav__links {
  list-style: none;
}

.side-nav__links li {
  margin-bottom: var(--spacing-sm);
}

.side-nav__links a {
  display: block;
  padding: var(--spacing-sm) 0;
  font-size: 1.125rem;
  color: var(--color-text-secondary);
  border-bottom: 1px solid var(--color-border-light);
  transition: color var(--transition-fast), padding-left var(--transition-fast);
}

.side-nav__links a:hover {
  color: var(--color-text);
  padding-left: var(--spacing-xs);
}

.side-nav__section {
  margin-top: var(--spacing-xl);
}

.side-nav__section-title {
  font-size: 0.75rem;
  text-transform: uppercase;
  letter-spacing: 0.1em;
  color: var(--color-text-muted);
  margin-bottom: var(--spacing-sm);
}

/* ============================================
   MAIN CONTENT
   ============================================ */

.main-content {
  padding-top: calc(var(--top-bar-height) + var(--spacing-xxl));
  padding-bottom: var(--spacing-xxl);
  min-height: 100vh;
}

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

/* ============================================
   HOMEPAGE
   ============================================ */

.hero {
  margin-bottom: var(--spacing-xxl);
}

.hero__inner {
  display: flex;
  align-items: center;
  gap: var(--spacing-xl);
}

.hero__text {
  flex: 1;
}

.hero__title {
  font-size: 4rem;
  margin-bottom: var(--spacing-sm);
  letter-spacing: -0.03em;
}

.hero__bio {
  font-size: 1.1rem;
  color: var(--color-text-secondary);
  line-height: 1.7;
}

.hero__photo {
  flex-shrink: 0;
  width: 220px;
}

.hero__photo img {
  width: 220px;
  height: 220px;
  border-radius: 50%;
  object-fit: cover;
  object-position: center top;
}

@media (max-width: 600px) {
  .hero__inner {
    flex-direction: column-reverse;
    align-items: center;
    text-align: center;
  }

  .hero__photo {
    width: 120px;
  }

  .hero__photo img {
    width: 120px;
    height: 120px;
  }
}

/* Posts List */
.posts-section {
  margin-top: var(--spacing-xxl);
}

.section-title {
  font-size: 0.875rem;
  text-transform: uppercase;
  letter-spacing: 0.1em;
  color: var(--color-text-muted);
  margin-bottom: var(--spacing-lg);
  padding-bottom: var(--spacing-sm);
  border-bottom: 1px solid var(--color-border);
}

.posts-list {
  list-style: none;
}

.post-item {
  padding: var(--spacing-lg) 0;
  border-bottom: 1px solid var(--color-border-light);
}

.post-item:first-child {
  padding-top: 0;
}

.post-item__link {
  display: block;
}

.post-item__title {
  font-family: var(--font-serif);
  font-size: 1.5rem;
  font-weight: 500;
  margin-bottom: var(--spacing-xs);
  transition: color var(--transition-fast);
}

.post-item__link:hover .post-item__title {
  color: var(--color-text-secondary);
}

.post-item__subtitle {
  color: var(--color-text-secondary);
  font-size: 1rem;
  margin-bottom: var(--spacing-xs);
  line-height: 1.6;
}

.post-item__date {
  font-size: 0.875rem;
  color: var(--color-text-muted);
}

/* ============================================
   ABOUT PAGE
   ============================================ */

.about-page {
  max-width: 600px;
}

.about-page h1 {
  margin-bottom: var(--spacing-xl);
}

.about-content p {
  font-size: 1.125rem;
  color: var(--color-text-secondary);
  line-height: 1.9;
}

.about-content p:last-child {
  margin-bottom: 0;
}

/* ============================================
   POST PAGE
   ============================================ */

.post-header {
  margin-bottom: var(--spacing-xl);
  padding-bottom: var(--spacing-lg);
  border-bottom: 1px solid var(--color-border);
}

.post-header__title {
  font-size: 2.75rem;
  margin-bottom: var(--spacing-sm);
  letter-spacing: -0.02em;
}

.post-header__subtitle {
  font-size: 1.25rem;
  color: var(--color-text-secondary);
  margin-bottom: var(--spacing-md);
  line-height: 1.6;
}

.post-header__meta {
  font-size: 0.875rem;
  color: var(--color-text-muted);
}

/* Post Body */
.post-body {
  font-size: 1.125rem;
  line-height: 1.9;
}

.post-body h2 {
  margin-top: var(--spacing-xl);
  margin-bottom: var(--spacing-md);
}

.post-body h3 {
  margin-top: var(--spacing-lg);
  margin-bottom: var(--spacing-sm);
}

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

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

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

.post-body blockquote {
  margin: var(--spacing-lg) 0;
  padding-left: var(--spacing-lg);
  border-left: 3px solid var(--color-border);
  font-style: italic;
  color: var(--color-text-secondary);
}

.post-body code {
  font-family: 'SF Mono', Monaco, 'Courier New', monospace;
  font-size: 0.9em;
  background-color: var(--color-border-light);
  padding: 0.2em 0.4em;
  border-radius: 3px;
}

.post-body pre {
  margin: var(--spacing-lg) 0;
  padding: var(--spacing-md);
  background-color: var(--color-bg-secondary);
  border: 1px solid var(--color-border);
  border-radius: 6px;
  overflow-x: auto;
}

.post-body pre code {
  background: none;
  padding: 0;
}

.post-body img {
  margin: var(--spacing-lg) 0;
  border-radius: 4px;
}

.post-body a {
  text-decoration: underline;
  text-underline-offset: 3px;
}

/* Author Bio Card */
.author-card {
  margin-top: var(--spacing-xxl);
  padding: var(--spacing-lg);
  background-color: var(--color-bg-secondary);
  border: 1px solid var(--color-border);
  border-radius: 8px;
  display: flex;
  gap: var(--spacing-md);
  align-items: flex-start;
}

.author-card__avatar {
  width: 64px;
  height: 64px;
  border-radius: 50%;
  background-color: var(--color-border);
  flex-shrink: 0;
  display: flex;
  align-items: center;
  justify-content: center;
  font-family: var(--font-serif);
  font-size: 1.5rem;
  color: var(--color-text-secondary);
}

.author-card__info h4 {
  font-family: var(--font-sans);
  font-weight: 600;
  font-size: 1rem;
  margin-bottom: var(--spacing-xs);
}

.author-card__info p {
  font-size: 0.9375rem;
  color: var(--color-text-secondary);
  margin-bottom: 0;
  line-height: 1.6;
}

/* Post Navigation */
.post-nav {
  margin-top: var(--spacing-xl);
  padding-top: var(--spacing-xl);
  border-top: 1px solid var(--color-border);
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: var(--spacing-lg);
}

.post-nav__item {
  display: block;
}

.post-nav__item--next {
  text-align: right;
}

.post-nav__label {
  font-size: 0.75rem;
  text-transform: uppercase;
  letter-spacing: 0.1em;
  color: var(--color-text-muted);
  margin-bottom: var(--spacing-xs);
}

.post-nav__title {
  font-family: var(--font-serif);
  font-size: 1.125rem;
  color: var(--color-text);
  transition: color var(--transition-fast);
}

.post-nav__item:hover .post-nav__title {
  color: var(--color-text-secondary);
}

/* Comments Section */
.comments-section {
  margin-top: var(--spacing-xxl);
  padding-top: var(--spacing-xl);
  border-top: 1px solid var(--color-border);
}

.comments-section__title {
  font-size: 1.25rem;
  margin-bottom: var(--spacing-lg);
}

/* ============================================
   FOOTER
   ============================================ */

.footer {
  margin-top: var(--spacing-xxl);
  padding-top: var(--spacing-lg);
  border-top: 1px solid var(--color-border);
  text-align: center;
}

.footer p {
  font-size: 0.875rem;
  color: var(--color-text-muted);
  margin-bottom: 0;
}

/* ============================================
   RESPONSIVE
   ============================================ */

@media (max-width: 768px) {
  :root {
    --spacing-xxl: 3rem;
  }

  h1 {
    font-size: 2.25rem;
  }

  .hero__title {
    font-size: 2.75rem;
  }

  .hero__bio {
    font-size: 1.125rem;
  }

  .top-nav {
    display: none;
  }

  .top-bar {
    padding: 0 var(--spacing-sm);
  }

  .container {
    padding: 0 var(--spacing-sm);
  }

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

  .post-header__subtitle {
    font-size: 1.125rem;
  }

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

  .author-card {
    flex-direction: column;
    align-items: center;
    text-align: center;
  }

  .post-nav {
    grid-template-columns: 1fr;
  }

  .post-nav__item--next {
    text-align: left;
  }

  .side-nav {
    width: 100%;
  }
}

@media (max-width: 480px) {
  .hero__title {
    font-size: 2.25rem;
  }

  .post-item__title {
    font-size: 1.25rem;
  }
}

/* ============================================
   UTILITIES
   ============================================ */

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