/* ===========================
   Variables
   =========================== */
:root {
  --bg:           #0f0f11;
  --bg-2:         #161618;
  --bg-3:         #1e1e21;
  --text:         #d4d4d8;
  --text-strong:  #f4f4f5;
  --text-muted:   #52525b;
  --accent:       #60a5fa;
  --accent-dim:   #1e3a5f;
  --border:       #27272a;
  --green:        #4ade80;
  --red:          #f87171;
  --yellow:       #fbbf24;

  --font-sans: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', system-ui, sans-serif;
  --font-mono: 'JetBrains Mono', 'Fira Code', ui-monospace, 'Cascadia Code', monospace;

  --max-width: 720px;
  --spacing-xs: 0.25rem;
  --spacing-sm: 0.5rem;
  --spacing-md: 1rem;
  --spacing-lg: 2rem;
  --spacing-xl: 4rem;
}

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

html {
  font-size: 16px;
  scroll-behavior: smooth;
}

body {
  font-family: var(--font-sans);
  background-color: var(--bg);
  color: var(--text);
  line-height: 1.7;
  min-height: 100vh;
  display: flex;
  flex-direction: column;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}

a {
  color: var(--accent);
  text-decoration: none;
  transition: color 0.15s ease, opacity 0.15s ease;
}

a:hover {
  color: var(--text-strong);
}

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

/* ===========================
   Layout
   =========================== */
.container {
  max-width: var(--max-width);
  margin: 0 auto;
  padding: 0 var(--spacing-lg);
  width: 100%;
}

main.container {
  flex: 1;
  padding-top: var(--spacing-xl);
  padding-bottom: var(--spacing-xl);
}

/* ===========================
   Header
   =========================== */
.site-header {
  border-bottom: 1px solid var(--border);
  padding: var(--spacing-md) 0;
  position: sticky;
  top: 0;
  background-color: rgba(15, 15, 17, 0.92);
  backdrop-filter: blur(8px);
  -webkit-backdrop-filter: blur(8px);
  z-index: 100;
}

.header-inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: var(--spacing-lg);
}

.site-title {
  font-family: var(--font-mono);
  font-size: 0.95rem;
  font-weight: 500;
  color: var(--text-strong);
  letter-spacing: -0.01em;
  white-space: nowrap;
}

.site-title .placeholder {
  color: var(--text-muted);
  font-style: italic;
}

.site-title:hover {
  color: var(--accent);
}

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

.site-nav a {
  font-family: var(--font-mono);
  font-size: 0.8rem;
  color: var(--text-muted);
  text-transform: lowercase;
  letter-spacing: 0.02em;
}

.site-nav a:hover,
.site-nav a.active {
  color: var(--text-strong);
}

/* ===========================
   Footer
   =========================== */
.site-footer {
  border-top: 1px solid var(--border);
  padding: var(--spacing-lg) 0;
  margin-top: auto;
}

.footer-inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: var(--spacing-md);
  flex-wrap: wrap;
}

.footer-text {
  font-size: 0.8rem;
  color: var(--text-muted);
  font-family: var(--font-mono);
}

.footer-links {
  display: flex;
  gap: var(--spacing-md);
}

.footer-links a {
  font-size: 0.8rem;
  font-family: var(--font-mono);
  color: var(--text-muted);
}

.footer-links a:hover {
  color: var(--text-strong);
}

/* ===========================
   Home Page
   =========================== */
.home-intro {
  margin-bottom: var(--spacing-xl);
  padding-bottom: var(--spacing-xl);
  border-bottom: 1px solid var(--border);
}

.home-intro h1 {
  font-size: 1.5rem;
  font-weight: 600;
  color: var(--text-strong);
  line-height: 1.3;
  margin-bottom: var(--spacing-md);
  letter-spacing: -0.02em;
}

.home-intro p {
  color: var(--text-muted);
  font-size: 0.95rem;
  max-width: 520px;
  margin-bottom: var(--spacing-sm);
}

.home-intro .focus-areas {
  display: flex;
  flex-wrap: wrap;
  gap: var(--spacing-sm);
  margin-top: var(--spacing-md);
}

.focus-pill {
  font-family: var(--font-mono);
  font-size: 0.75rem;
  color: var(--text-muted);
  border: 1px solid var(--border);
  padding: 2px 10px;
  border-radius: 999px;
}

.section-header {
  display: flex;
  align-items: baseline;
  justify-content: space-between;
  margin-bottom: var(--spacing-lg);
}

.section-header h2 {
  font-size: 0.75rem;
  font-family: var(--font-mono);
  text-transform: uppercase;
  letter-spacing: 0.1em;
  color: var(--text-muted);
  font-weight: 500;
}

.section-header a {
  font-size: 0.75rem;
  font-family: var(--font-mono);
  color: var(--text-muted);
}

.section-header a:hover {
  color: var(--accent);
}

/* ===========================
   Post Lists
   =========================== */
.post-list {
  list-style: none;
  display: flex;
  flex-direction: column;
}

.post-list-item {
  display: flex;
  align-items: baseline;
  justify-content: space-between;
  gap: var(--spacing-md);
  padding: var(--spacing-md) 0;
  border-bottom: 1px solid var(--border);
}

.post-list-item:last-child {
  border-bottom: none;
}

.post-list-item .item-left {
  display: flex;
  align-items: baseline;
  gap: var(--spacing-md);
  min-width: 0;
}

.post-list-item a {
  color: var(--text);
  font-size: 0.95rem;
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
}

.post-list-item a:hover {
  color: var(--text-strong);
}

.post-list-item .item-tags {
  display: flex;
  gap: var(--spacing-xs);
  flex-shrink: 0;
}

.post-list-date {
  font-family: var(--font-mono);
  font-size: 0.75rem;
  color: var(--text-muted);
  white-space: nowrap;
  flex-shrink: 0;
}

.home-section {
  margin-bottom: var(--spacing-xl);
}

/* ===========================
   Tags
   =========================== */
.tag {
  font-family: var(--font-mono);
  font-size: 0.7rem;
  color: var(--text-muted);
  border: 1px solid var(--border);
  padding: 1px 7px;
  border-radius: 3px;
  white-space: nowrap;
}

.tag-ctf {
  color: var(--green);
  border-color: rgba(74, 222, 128, 0.2);
}

.tag-security {
  color: var(--red);
  border-color: rgba(248, 113, 113, 0.2);
}

.tag-cloud {
  color: var(--accent);
  border-color: rgba(96, 165, 250, 0.2);
}

/* ===========================
   Post / Page Content
   =========================== */
.post-header,
.page-header {
  margin-bottom: var(--spacing-xl);
  padding-bottom: var(--spacing-lg);
  border-bottom: 1px solid var(--border);
}

.post-meta {
  display: flex;
  align-items: center;
  gap: var(--spacing-sm);
  margin-bottom: var(--spacing-md);
  flex-wrap: wrap;
}

.post-meta time {
  font-family: var(--font-mono);
  font-size: 0.8rem;
  color: var(--text-muted);
}

.post-title,
.page-title {
  font-size: 1.6rem;
  font-weight: 600;
  color: var(--text-strong);
  line-height: 1.3;
  letter-spacing: -0.02em;
  margin-bottom: var(--spacing-sm);
}

.post-description,
.page-description {
  font-size: 1rem;
  color: var(--text-muted);
  margin-top: var(--spacing-sm);
}

/* Post body typography */
.post-content,
.page-content {
  font-size: 0.97rem;
  line-height: 1.8;
}

.post-content h1,
.post-content h2,
.post-content h3,
.post-content h4,
.page-content h1,
.page-content h2,
.page-content h3,
.page-content h4 {
  color: var(--text-strong);
  font-weight: 600;
  margin-top: var(--spacing-xl);
  margin-bottom: var(--spacing-md);
  letter-spacing: -0.01em;
  line-height: 1.35;
}

.post-content h2,
.page-content h2 { font-size: 1.2rem; }
.post-content h3,
.page-content h3 { font-size: 1.05rem; }

.post-content p,
.page-content p {
  margin-bottom: var(--spacing-md);
}

.post-content ul,
.post-content ol,
.page-content ul,
.page-content ol {
  margin: var(--spacing-md) 0;
  padding-left: var(--spacing-lg);
}

.post-content li,
.page-content li {
  margin-bottom: var(--spacing-xs);
}

.post-content blockquote,
.page-content blockquote {
  border-left: 2px solid var(--accent);
  padding-left: var(--spacing-md);
  color: var(--text-muted);
  font-style: italic;
  margin: var(--spacing-lg) 0;
}

.post-content hr,
.page-content hr {
  border: none;
  border-top: 1px solid var(--border);
  margin: var(--spacing-xl) 0;
}

/* Inline code */
.post-content code,
.page-content code {
  font-family: var(--font-mono);
  font-size: 0.85em;
  background: var(--bg-3);
  border: 1px solid var(--border);
  padding: 1px 5px;
  border-radius: 3px;
  color: var(--accent);
}

/* Code blocks */
.post-content pre,
.page-content pre {
  background: var(--bg-2);
  border: 1px solid var(--border);
  border-radius: 6px;
  padding: var(--spacing-md);
  overflow-x: auto;
  margin: var(--spacing-lg) 0;
  font-size: 0.85rem;
  line-height: 1.6;
}

.post-content pre code,
.page-content pre code {
  background: none;
  border: none;
  padding: 0;
  color: var(--text);
  font-size: inherit;
}

/* Tables */
.post-content table,
.page-content table {
  width: 100%;
  border-collapse: collapse;
  margin: var(--spacing-lg) 0;
  font-size: 0.9rem;
}

.post-content th,
.post-content td,
.page-content th,
.page-content td {
  padding: var(--spacing-sm) var(--spacing-md);
  border: 1px solid var(--border);
  text-align: left;
}

.post-content th,
.page-content th {
  background: var(--bg-2);
  color: var(--text-strong);
  font-weight: 600;
  font-size: 0.8rem;
  text-transform: uppercase;
  letter-spacing: 0.05em;
  font-family: var(--font-mono);
}

.post-footer {
  margin-top: var(--spacing-xl);
  padding-top: var(--spacing-lg);
  border-top: 1px solid var(--border);
}

.back-link {
  font-family: var(--font-mono);
  font-size: 0.8rem;
  color: var(--text-muted);
}

.back-link:hover {
  color: var(--accent);
}

/* ===========================
   Projects Page
   =========================== */
.projects-grid {
  display: flex;
  flex-direction: column;
  gap: var(--spacing-md);
}

.project-card {
  background: var(--bg-2);
  border: 1px solid var(--border);
  border-radius: 6px;
  padding: var(--spacing-lg);
  transition: border-color 0.15s ease;
}

.project-card:hover {
  border-color: var(--text-muted);
}

.project-card-header {
  display: flex;
  align-items: flex-start;
  justify-content: space-between;
  gap: var(--spacing-md);
  margin-bottom: var(--spacing-sm);
}

.project-name {
  font-family: var(--font-mono);
  font-size: 0.95rem;
  font-weight: 500;
  color: var(--text-strong);
}

.project-name a {
  color: inherit;
}

.project-name a:hover {
  color: var(--accent);
}

.project-links {
  display: flex;
  gap: var(--spacing-md);
  flex-shrink: 0;
}

.project-links a {
  font-family: var(--font-mono);
  font-size: 0.75rem;
  color: var(--text-muted);
}

.project-links a:hover {
  color: var(--accent);
}

.project-description {
  font-size: 0.9rem;
  color: var(--text-muted);
  margin-bottom: var(--spacing-md);
  line-height: 1.6;
}

.project-tags {
  display: flex;
  flex-wrap: wrap;
  gap: var(--spacing-xs);
}

/* ===========================
   About Page
   =========================== */
.about-intro {
  margin-bottom: var(--spacing-xl);
}

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

.skills-section {
  margin: var(--spacing-xl) 0;
}

.skills-section h2 {
  font-size: 0.75rem;
  font-family: var(--font-mono);
  text-transform: uppercase;
  letter-spacing: 0.1em;
  color: var(--text-muted);
  margin-bottom: var(--spacing-lg);
}

.skills-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(200px, 1fr));
  gap: var(--spacing-lg);
}

.skill-group h3 {
  font-family: var(--font-mono);
  font-size: 0.8rem;
  color: var(--text-strong);
  margin-bottom: var(--spacing-sm);
  font-weight: 500;
}

.skill-group ul {
  list-style: none;
  padding: 0;
}

.skill-group li {
  font-size: 0.85rem;
  color: var(--text-muted);
  padding: 3px 0;
  font-family: var(--font-mono);
}

.skill-group li::before {
  content: "- ";
  color: var(--border);
}

/* ===========================
   Syntax Highlighting (Rouge)
   =========================== */
.highlight { background: var(--bg-2); }
.highlight .c  { color: #6b7280; font-style: italic; } /* Comment */
.highlight .k  { color: #c084fc; } /* Keyword */
.highlight .s  { color: #4ade80; } /* String */
.highlight .s2 { color: #4ade80; } /* String double */
.highlight .s1 { color: #4ade80; } /* String single */
.highlight .n  { color: var(--text); } /* Name */
.highlight .nb { color: #60a5fa; } /* Name builtin */
.highlight .nc { color: #fbbf24; } /* Name class */
.highlight .nf { color: #60a5fa; } /* Name function */
.highlight .o  { color: #94a3b8; } /* Operator */
.highlight .mi { color: #fb923c; } /* Literal int */
.highlight .mf { color: #fb923c; } /* Literal float */
.highlight .cp { color: #c084fc; } /* Comment preproc */
.highlight .kn { color: #c084fc; } /* Keyword namespace */
.highlight .kd { color: #c084fc; } /* Keyword declaration */
.highlight .kt { color: #fbbf24; } /* Keyword type */
.highlight .p  { color: #94a3b8; } /* Punctuation */

/* ===========================
   Utilities
   =========================== */
.text-muted { color: var(--text-muted); }
.text-mono  { font-family: var(--font-mono); }
.text-sm    { font-size: 0.85rem; }

/* ===========================
   Responsive
   =========================== */
@media (max-width: 600px) {
  .container {
    padding: 0 var(--spacing-md);
  }

  main.container {
    padding-top: var(--spacing-lg);
    padding-bottom: var(--spacing-lg);
  }

  .header-inner {
    flex-direction: column;
    align-items: flex-start;
    gap: var(--spacing-sm);
  }

  .site-nav {
    gap: var(--spacing-md);
  }

  .post-title,
  .page-title {
    font-size: 1.3rem;
  }

  .post-list-item {
    flex-direction: column;
    gap: var(--spacing-xs);
    align-items: flex-start;
  }

  .footer-inner {
    flex-direction: column;
    gap: var(--spacing-sm);
  }

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