/* ============================================
   LIGHT-LITE.LIVE - Structuralist Blog
   Design: Red & Black / 结构主义
   ============================================ */

/* ---------- CSS Custom Properties ---------- */
:root {
  --color-red: #DC2626;
  --color-red-dark: #B91C1C;
  --color-red-light: #EF4444;
  --color-black: #0A0A0A;
  --color-black-2: #111111;
  --color-black-3: #1A1A1A;
  --color-gray-900: #171717;
  --color-gray-800: #262626;
  --color-gray-700: #404040;
  --color-gray-500: #737373;
  --color-gray-300: #A3A3A3;
  --color-gray-200: #D4D4D4;
  --color-gray-100: #E5E5E5;
  --color-white: #FFFFFF;
  --color-off-white: #F5F5F5;

  --font-sans: 'Inter', -apple-system, BlinkMacSystemFont, sans-serif;
  --font-mono: 'JetBrains Mono', 'SF Mono', 'Fira Code', monospace;

  --header-height: 64px;
  --grid-gap: 24px;
  --content-max-width: 1200px;
  --transition-fast: 150ms cubic-bezier(0.4, 0, 0.2, 1);
  --transition-base: 250ms cubic-bezier(0.4, 0, 0.2, 1);
}

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

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

body {
  font-family: var(--font-sans);
  background: var(--color-black);
  color: var(--color-gray-100);
  line-height: 1.6;
  min-height: 100vh;
}

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

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

code {
  font-family: var(--font-mono);
  background: var(--color-gray-800);
  padding: 2px 6px;
  border-radius: 0;
  font-size: 0.875em;
}

pre code {
  background: transparent;
  padding: 0;
}

/* ---------- Layout ---------- */
.site-header {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  height: var(--header-height);
  background: var(--color-black-2);
  border-bottom: 2px solid var(--color-red);
  z-index: 100;
}

.header-grid {
  max-width: var(--content-max-width);
  margin: 0 auto;
  padding: 0 var(--grid-gap);
  height: 100%;
  display: grid;
  grid-template-columns: auto 1fr auto;
  align-items: center;
  gap: 32px;
}

.header-brand {
  display: flex;
  align-items: center;
  gap: 0;
}

.logo-link {
  display: flex;
  align-items: center;
  gap: 0;
  font-family: var(--font-mono);
  font-size: 1.125rem;
  font-weight: 600;
  letter-spacing: -0.02em;
}

.logo-link:hover {
  color: inherit;
}

.logo-bracket {
  color: var(--color-red);
  font-weight: 700;
  font-size: 1.25rem;
}

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

.logo-domain {
  font-family: var(--font-mono);
  font-size: 0.75rem;
  color: var(--color-gray-500);
  margin-left: 2px;
  align-self: flex-end;
  padding-bottom: 2px;
}

.header-nav {
  display: flex;
  align-items: center;
  gap: 4px;
  font-family: var(--font-mono);
  font-size: 0.8125rem;
}

.header-nav a {
  padding: 6px 16px;
  border: 1px solid transparent;
  color: var(--color-gray-500);
  letter-spacing: 0.02em;
  text-transform: uppercase;
  font-size: 0.75rem;
  font-weight: 500;
  transition: all var(--transition-fast);
}

.header-nav a:hover {
  color: var(--color-white);
  border-color: var(--color-red);
}

.header-nav a.active {
  color: var(--color-red);
  border-color: var(--color-red);
  background: rgba(220, 38, 38, 0.08);
}

.header-corner {
  font-family: var(--font-mono);
  font-size: 0.65rem;
  color: var(--color-gray-700);
  letter-spacing: 0.15em;
  text-transform: uppercase;
  text-align: right;
}

/* ---------- Main Content Area ---------- */
.site-main {
  margin-top: calc(var(--header-height) + 0px);
  min-height: calc(100vh - var(--header-height) - 56px);
}

/* ---------- Hero Strip ---------- */
.hero-strip {
  padding: 40px var(--grid-gap) 0;
  max-width: var(--content-max-width);
  margin: 0 auto;
}

.hero-strip-inner {
  display: flex;
  align-items: center;
  gap: 12px;
  font-family: var(--font-mono);
  font-size: 0.7rem;
  letter-spacing: 0.2em;
  color: var(--color-gray-500);
  margin-bottom: 8px;
}

.strip-label {
  color: var(--color-red);
  font-weight: 600;
}

.strip-divider {
  color: var(--color-red);
}

.strip-count {
  color: var(--color-gray-700);
}

.strip-line {
  height: 1px;
  background: linear-gradient(90deg, var(--color-red), var(--color-gray-800) 60%, transparent);
}

/* ---------- Posts Grid ---------- */
.posts-grid {
  max-width: var(--content-max-width);
  margin: 0 auto;
  padding: 32px var(--grid-gap) 80px;
  display: flex;
  flex-direction: column;
  gap: 2px;
}

.post-card {
  display: grid;
  grid-template-columns: 48px 1fr 40px;
  gap: 20px;
  align-items: center;
  padding: 20px 24px;
  background: var(--color-black-3);
  border: 1px solid var(--color-gray-800);
  border-left: 3px solid var(--color-gray-800);
  cursor: pointer;
  transition: all var(--transition-base);
  position: relative;
  overflow: hidden;
}

.post-card::before {
  content: '';
  position: absolute;
  top: 0;
  left: 0;
  width: 3px;
  height: 100%;
  background: var(--color-red);
  transform: scaleY(0);
  transform-origin: top;
  transition: transform var(--transition-base);
}

.post-card:hover {
  border-color: var(--color-gray-700);
  background: var(--color-gray-900);
  border-left-color: var(--color-red);
}

.post-card:hover::before {
  transform: scaleY(1);
}

.card-index {
  font-family: var(--font-mono);
  font-size: 1rem;
  font-weight: 700;
  color: var(--color-gray-700);
  text-align: center;
  transition: color var(--transition-fast);
}

.post-card:hover .card-index {
  color: var(--color-red);
}

.card-content {
  min-width: 0;
}

.card-meta {
  display: flex;
  align-items: center;
  gap: 12px;
  margin-bottom: 6px;
  flex-wrap: wrap;
}

.card-date {
  font-family: var(--font-mono);
  font-size: 0.7rem;
  color: var(--color-gray-500);
  letter-spacing: 0.05em;
}

.card-tags {
  display: flex;
  gap: 6px;
  flex-wrap: wrap;
}

.tag {
  display: inline-block;
  font-family: var(--font-mono);
  font-size: 0.6rem;
  padding: 2px 8px;
  background: rgba(220, 38, 38, 0.1);
  border: 1px solid rgba(220, 38, 38, 0.3);
  color: var(--color-red-light);
  letter-spacing: 0.05em;
  text-transform: uppercase;
}

.card-title {
  font-size: 1.125rem;
  font-weight: 600;
  color: var(--color-white);
  line-height: 1.3;
  letter-spacing: -0.02em;
  transition: color var(--transition-fast);
}

.post-card:hover .card-title {
  color: var(--color-red-light);
}

.card-excerpt {
  font-size: 0.8125rem;
  color: var(--color-gray-500);
  margin-top: 6px;
  line-height: 1.5;
  display: -webkit-box;
  -webkit-line-clamp: 2;
  -webkit-box-orient: vertical;
  overflow: hidden;
}

.card-arrow {
  font-size: 1.25rem;
  color: var(--color-gray-700);
  text-align: center;
  transition: all var(--transition-fast);
}

.post-card:hover .card-arrow {
  color: var(--color-red);
  transform: translateX(4px);
}

/* ---------- Empty State ---------- */
.empty-state {
  padding: 80px 24px;
  text-align: center;
}

.empty-block {
  display: inline-block;
  padding: 40px 48px;
  border: 1px solid var(--color-gray-800);
  background: var(--color-black-3);
}

.empty-symbol {
  font-size: 2rem;
  color: var(--color-gray-700);
  display: block;
  margin-bottom: 16px;
}

.empty-block p {
  font-size: 0.875rem;
  color: var(--color-gray-500);
  font-family: var(--font-mono);
}

.empty-block code {
  color: var(--color-red-light);
}

/* ============================================
   POST VIEW
   ============================================ */
.view-post {
  max-width: var(--content-max-width);
  margin: 0 auto;
  padding: 40px var(--grid-gap) 80px;
}

.back-btn {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  background: transparent;
  border: 1px solid var(--color-gray-800);
  color: var(--color-gray-500);
  font-family: var(--font-mono);
  font-size: 0.75rem;
  padding: 8px 20px;
  cursor: pointer;
  transition: all var(--transition-fast);
  text-transform: uppercase;
  letter-spacing: 0.05em;
  margin-bottom: 40px;
}

.back-btn:hover {
  border-color: var(--color-red);
  color: var(--color-red);
}

.back-arrow {
  font-size: 1rem;
}

.post-article {
  max-width: 780px;
}

.post-header {
  margin-bottom: 48px;
  padding-bottom: 32px;
  border-bottom: 2px solid var(--color-gray-800);
}

.post-meta-bar {
  display: flex;
  align-items: center;
  gap: 16px;
  margin-bottom: 16px;
  flex-wrap: wrap;
}

.post-date {
  font-family: var(--font-mono);
  font-size: 0.75rem;
  color: var(--color-gray-500);
  letter-spacing: 0.05em;
}

.post-tags {
  display: flex;
  gap: 8px;
  flex-wrap: wrap;
}

.post-title {
  font-size: 2rem;
  font-weight: 700;
  color: var(--color-white);
  line-height: 1.2;
  letter-spacing: -0.03em;
}

/* ---------- Post Content Markdown Styles ---------- */
.post-content {
  font-size: 1rem;
  line-height: 1.8;
  color: var(--color-gray-200);
}

.post-content h1,
.post-content h2,
.post-content h3,
.post-content h4 {
  color: var(--color-white);
  font-weight: 600;
  line-height: 1.3;
  letter-spacing: -0.02em;
  margin-top: 2em;
  margin-bottom: 0.75em;
}

.post-content h1 {
  font-size: 1.75rem;
  border-bottom: 1px solid var(--color-gray-800);
  padding-bottom: 0.5em;
}

.post-content h2 {
  font-size: 1.375rem;
}

.post-content h3 {
  font-size: 1.125rem;
}

.post-content p {
  margin-bottom: 1.25em;
}

.post-content a {
  color: var(--color-red-light);
  border-bottom: 1px solid transparent;
  transition: border-color var(--transition-fast);
}

.post-content a:hover {
  border-bottom-color: var(--color-red);
}

.post-content strong {
  color: var(--color-white);
  font-weight: 600;
}

.post-content blockquote {
  border-left: 3px solid var(--color-red);
  padding: 16px 20px;
  margin: 1.5em 0;
  background: var(--color-black-3);
  color: var(--color-gray-300);
  font-style: italic;
}

.post-content ul,
.post-content ol {
  padding-left: 1.5em;
  margin-bottom: 1.25em;
}

.post-content li {
  margin-bottom: 0.5em;
}

.post-content li::marker {
  color: var(--color-red);
}

.post-content hr {
  border: none;
  height: 1px;
  background: var(--color-gray-800);
  margin: 2em 0;
}

.post-content img {
  max-width: 100%;
  border: 1px solid var(--color-gray-800);
  margin: 1.5em 0;
}

.post-content pre {
  background: var(--color-black-3);
  border: 1px solid var(--color-gray-800);
  border-left: 3px solid var(--color-red);
  padding: 20px;
  overflow-x: auto;
  margin: 1.5em 0;
  font-family: var(--font-mono);
  font-size: 0.8125rem;
  line-height: 1.6;
}

.post-content table {
  width: 100%;
  border-collapse: collapse;
  margin: 1.5em 0;
}

.post-content th {
  background: var(--color-black-3);
  color: var(--color-white);
  font-weight: 600;
  text-align: left;
  padding: 10px 16px;
  border: 1px solid var(--color-gray-800);
  text-transform: uppercase;
  font-size: 0.8125rem;
  letter-spacing: 0.05em;
}

.post-content td {
  padding: 10px 16px;
  border: 1px solid var(--color-gray-800);
}

.post-content tr:nth-child(even) {
  background: var(--color-black-3);
}

.post-content code:not(pre code) {
  background: var(--color-gray-800);
  padding: 2px 8px;
  font-size: 0.875em;
  color: var(--color-red-light);
}

/* ============================================
   ABOUT VIEW
   ============================================ */
.view-about {
  max-width: var(--content-max-width);
  margin: 0 auto;
  padding: 60px var(--grid-gap) 80px;
}

.about-container {
  max-width: 640px;
}

.about-label {
  font-family: var(--font-mono);
  font-size: 0.65rem;
  color: var(--color-red);
  letter-spacing: 0.25em;
  font-weight: 600;
}

.about-title {
  font-size: 2.5rem;
  font-weight: 800;
  color: var(--color-white);
  margin-top: 8px;
  line-height: 1.1;
  letter-spacing: -0.03em;
}

.about-divider {
  width: 60px;
  height: 3px;
  background: var(--color-red);
  margin: 24px 0;
}

.about-text {
  font-size: 0.9375rem;
  color: var(--color-gray-300);
  line-height: 1.7;
}

.about-text p {
  margin-bottom: 1em;
}

.about-tech {
  margin-top: 40px;
  border-top: 1px solid var(--color-gray-800);
  padding-top: 24px;
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 16px;
}

.tech-item {
  display: flex;
  flex-direction: column;
  gap: 4px;
  padding: 12px 16px;
  border: 1px solid var(--color-gray-800);
  background: var(--color-black-3);
}

.tech-label {
  font-family: var(--font-mono);
  font-size: 0.6rem;
  color: var(--color-red);
  letter-spacing: 0.15em;
  text-transform: uppercase;
}

.tech-value {
  font-family: var(--font-mono);
  font-size: 0.75rem;
  color: var(--color-gray-300);
}

/* ============================================
   FOOTER
   ============================================ */
.site-footer {
  border-top: 1px solid var(--color-gray-800);
  padding: 20px var(--grid-gap);
}

.footer-inner {
  max-width: var(--content-max-width);
  margin: 0 auto;
  display: flex;
  align-items: center;
  gap: 12px;
  font-family: var(--font-mono);
  font-size: 0.7rem;
  color: var(--color-gray-700);
}

.footer-sep {
  color: var(--color-red);
}

/* ============================================
   RESPONSIVE
   ============================================ */
@media (max-width: 768px) {
  .header-grid {
    grid-template-columns: 1fr auto;
    gap: 16px;
  }

  .header-corner {
    display: none;
  }

  .post-card {
    grid-template-columns: 32px 1fr 24px;
    gap: 12px;
    padding: 16px;
  }

  .card-title {
    font-size: 1rem;
  }

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

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

  .about-title {
    font-size: 1.75rem;
  }
}

@media (max-width: 480px) {
  .header-nav a {
    padding: 6px 10px;
    font-size: 0.65rem;
  }

  .post-card {
    grid-template-columns: 24px 1fr 20px;
    gap: 8px;
    padding: 12px;
  }

  .card-index {
    font-size: 0.75rem;
  }

  .card-meta {
    flex-direction: column;
    align-items: flex-start;
    gap: 4px;
  }
}

/* ---------- Selection Style ---------- */
::selection {
  background: var(--color-red);
  color: var(--color-white);
}

/* ---------- Scrollbar ---------- */
::-webkit-scrollbar {
  width: 6px;
}

::-webkit-scrollbar-track {
  background: var(--color-black);
}

::-webkit-scrollbar-thumb {
  background: var(--color-gray-800);
}

::-webkit-scrollbar-thumb:hover {
  background: var(--color-red);
}