@import url('https://fonts.googleapis.com/css2?family=Outfit:wght@300;400;500;600;700&family=Inter:wght@300;400;500;600;700&family=Fira+Code:wght@400;500&display=swap');

/* ==========================================================================
   DESIGN SYSTEMS & PALETTES
   ========================================================================== */

:root {
  --font-heading: 'Outfit', -apple-system, sans-serif;
  --font-body: 'Inter', -apple-system, sans-serif;
  --font-code: 'Fira Code', monospace;
  
  /* Preset: Quartz (Light) */
  --bg-primary: #faf8f8;
  --bg-secondary: #f4f0f0;
  --border-color: #e5e5e5;
  --text-main: #2b2b2b;
  --text-muted: #636b75;
  --text-accent: #284b63;
  --text-accent-hover: #4e8098;
  --link-color: #284b63;
  --link-hover: #4e8098;
  --highlight-bg: rgba(40, 75, 99, 0.08);
  --code-bg: #ece8e8;
  --glow-color: rgba(40, 75, 99, 0.15);
  
  --shadow-sm: 0 2px 4px rgba(0, 0, 0, 0.02);
  --shadow-md: 0 8px 16px -2px rgba(0, 0, 0, 0.04), 0 2px 8px -2px rgba(0, 0, 0, 0.02);
  --shadow-lg: 0 16px 24px -4px rgba(0, 0, 0, 0.06), 0 4px 12px -2px rgba(0, 0, 0, 0.03);
  
  --transition-fast: 0.15s cubic-bezier(0.4, 0, 0.2, 1);
  --transition-normal: 0.25s cubic-bezier(0.4, 0, 0.2, 1);
  
  --border-radius-sm: 6px;
  --border-radius-md: 12px;
  --border-radius-lg: 20px;
}

/* Preset: Quartz (Auto Dark — follows OS preference) */
@media (prefers-color-scheme: dark) {
  :root[data-mode="auto"] {
    --bg-primary: #121314;
    --bg-secondary: #1a1c1d;
    --border-color: #2e3032;
    --text-main: #ebebec;
    --text-muted: #9fa6ad;
    --text-accent: #7b97aa;
    --text-accent-hover: #a5c4d4;
    --link-color: #7b97aa;
    --link-hover: #a5c4d4;
    --highlight-bg: rgba(123, 151, 170, 0.12);
    --code-bg: #1f2123;
    --glow-color: rgba(123, 151, 170, 0.25);
  }
}

:root[data-mode="dark"] {
  --bg-primary: #121314;
  --bg-secondary: #1a1c1d;
  --border-color: #2e3032;
  --text-main: #ebebec;
  --text-muted: #9fa6ad;
  --text-accent: #7b97aa;
  --text-accent-hover: #a5c4d4;
  --link-color: #7b97aa;
  --link-hover: #a5c4d4;
  --highlight-bg: rgba(123, 151, 170, 0.12);
  --code-bg: #1f2123;
  --glow-color: rgba(123, 151, 170, 0.25);
}

/* Preset: Dracula / Midnight (Always Dark) */
:root[data-theme="dracula"] {
  --bg-primary: #181824;
  --bg-secondary: #1f1f30;
  --border-color: #31314d;
  --text-main: #e0e0f0;
  --text-muted: #9595bd;
  --text-accent: #bd93f9;
  --text-accent-hover: #ff79c6;
  --link-color: #bd93f9;
  --link-hover: #ff79c6;
  --highlight-bg: rgba(189, 147, 249, 0.15);
  --code-bg: #1f1f33;
  --glow-color: rgba(189, 147, 249, 0.3);
}

/* Preset: Forest / Sage (Light) */
:root[data-theme="forest"] {
  --bg-primary: #f4f1ea;
  --bg-secondary: #e8e2d5;
  --border-color: #d1c8b3;
  --text-main: #2b3a30;
  --text-muted: #5e6f64;
  --text-accent: #3f5e4d;
  --text-accent-hover: #567e69;
  --link-color: #3f5e4d;
  --link-hover: #567e69;
  --highlight-bg: rgba(63, 94, 77, 0.1);
  --code-bg: #e3dcd0;
  --glow-color: rgba(63, 94, 77, 0.15);
}

/* Preset: Forest / Sage (Auto Dark — follows OS preference) */
@media (prefers-color-scheme: dark) {
  :root[data-theme="forest"][data-mode="auto"] {
    --bg-primary: #1a1e1b;
    --bg-secondary: #222924;
    --border-color: #353f38;
    --text-main: #e3ebd6;
    --text-muted: #a3b5a8;
    --text-accent: #8cb89f;
    --text-accent-hover: #add1be;
    --link-color: #8cb89f;
    --link-hover: #add1be;
    --highlight-bg: rgba(140, 184, 159, 0.15);
    --code-bg: #242b27;
    --glow-color: rgba(140, 184, 159, 0.25);
  }
}

:root[data-theme="forest"][data-mode="dark"] {
  --bg-primary: #1a1e1b;
  --bg-secondary: #222924;
  --border-color: #353f38;
  --text-main: #e3ebd6;
  --text-muted: #a3b5a8;
  --text-accent: #8cb89f;
  --text-accent-hover: #add1be;
  --link-color: #8cb89f;
  --link-hover: #add1be;
  --highlight-bg: rgba(140, 184, 159, 0.15);
  --code-bg: #242b27;
  --glow-color: rgba(140, 184, 159, 0.25);
}

/* Preset: Cyberpunk (Always Dark) */
:root[data-theme="cyberpunk"] {
  --bg-primary: #0a0b0e;
  --bg-secondary: #121620;
  --border-color: #232d3f;
  --text-main: #e0e6ed;
  --text-muted: #788fa6;
  --text-accent: #00f3ff;
  --text-accent-hover: #ff007f;
  --link-color: #00f3ff;
  --link-hover: #ff007f;
  --highlight-bg: rgba(0, 243, 255, 0.1);
  --code-bg: #141b29;
  --glow-color: rgba(0, 243, 255, 0.3);
}

/* ==========================================================================
   GLOBAL LAYOUT & RESET
   ========================================================================== */

* {
  box-sizing: border-box;
}

body {
  margin: 0;
  font-family: var(--font-body);
  color: var(--text-main);
  background-color: var(--bg-primary);
  line-height: 1.7;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
  transition: background-color var(--transition-normal), color var(--transition-normal);
}

/* Premium Scrollbars */
::-webkit-scrollbar {
  width: 10px;
  height: 10px;
}
::-webkit-scrollbar-track {
  background: var(--bg-primary);
}
::-webkit-scrollbar-thumb {
  background: var(--border-color);
  border-radius: var(--border-radius-sm);
  border: 2px solid var(--bg-primary);
}
::-webkit-scrollbar-thumb:hover {
  background: var(--text-muted);
}

/* ==========================================================================
   SITE SHELL COMPONENTS
   ========================================================================== */

.page-shell {
  width: min(84ch, calc(100% - 40px));
  margin: 0 auto;
  padding: 0 0 100px;
  animation: pageSlideUp 0.6s cubic-bezier(0.16, 1, 0.3, 1);
}

@keyframes pageSlideUp {
  from {
    opacity: 0;
    transform: translateY(12px);
  }
  to {
    opacity: 1;
    transform: translateY(0);
  }
}

/* Header */
.site-header {
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding: 30px 0;
  margin-bottom: 40px;
  border-bottom: 1px solid var(--border-color);
}

.site-logo {
  font-family: var(--font-heading);
  font-weight: 700;
  font-size: 1.5rem;
  letter-spacing: -0.5px;
  text-decoration: none;
  color: var(--text-main);
  display: flex;
  align-items: center;
  gap: 8px;
  transition: transform var(--transition-fast);
}

.site-logo:hover {
  transform: scale(1.02);
}

.site-logo-symbol {
  width: 24px;
  height: 24px;
  background: linear-gradient(135deg, var(--text-accent), var(--text-accent-hover));
  border-radius: 6px;
  display: inline-block;
  box-shadow: 0 2px 8px var(--glow-color);
}

.site-nav {
  display: flex;
  gap: 24px;
  align-items: center;
}

.site-nav-link {
  text-decoration: none;
  font-family: var(--font-heading);
  font-weight: 500;
  color: var(--text-muted);
  transition: color var(--transition-fast);
  position: relative;
  padding: 4px 0;
}

.site-nav-link:hover {
  color: var(--text-main);
}

.site-nav-link::after {
  content: '';
  position: absolute;
  bottom: 0;
  left: 0;
  width: 100%;
  height: 2px;
  background-color: var(--text-accent);
  transform: scaleX(0);
  transform-origin: right;
  transition: transform var(--transition-fast);
}

.site-nav-link:hover::after {
  transform: scaleX(1);
  transform-origin: left;
}

/* ==========================================================================
   MODE TOGGLE BUTTON (Header)
   ========================================================================== */

.mode-toggle-btn {
  background: transparent;
  border: 1px solid var(--border-color);
  color: var(--text-muted);
  width: 36px;
  height: 36px;
  border-radius: var(--border-radius-sm);
  cursor: pointer;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 1.15rem;
  line-height: 1;
  transition: all var(--transition-fast);
  outline: none;
  margin-left: 4px;
}

.mode-toggle-btn:hover {
  color: var(--text-main);
  background-color: var(--bg-secondary);
  border-color: var(--text-accent);
  box-shadow: 0 0 12px var(--glow-color);
  transform: scale(1.08);
}

.mode-toggle-btn:active {
  transform: scale(0.95);
}

/* ==========================================================================
   TYPOGRAPHY & MARKDOWN CONTENT
   ========================================================================== */

h1, h2, h3, h4, h5, h6 {
  font-family: var(--font-heading);
  font-weight: 700;
  color: var(--text-main);
  line-height: 1.25;
  margin-top: 2rem;
  margin-bottom: 1rem;
}

h1 {
  font-size: 2.5rem;
  letter-spacing: -1px;
  margin-top: 0;
  margin-bottom: 1.5rem;
  background: linear-gradient(to right, var(--text-main), var(--text-accent-hover));
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
}

h2 {
  font-size: 1.8rem;
  letter-spacing: -0.5px;
  border-bottom: 1px solid var(--border-color);
  padding-bottom: 8px;
}

h3 {
  font-size: 1.4rem;
}

p {
  margin-top: 0;
  margin-bottom: 1.5rem;
}

/* Links */
a {
  color: var(--link-color);
  text-decoration: none;
  font-weight: 500;
  transition: color var(--transition-fast), border-color var(--transition-fast);
  border-bottom: 1px solid transparent;
}

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

/* Specialized Wikilink styles (Quartz digital garden vibe) */
a.wikilink {
  border-bottom: 1px dashed var(--link-color);
  padding: 0 2px;
  background-color: var(--highlight-bg);
  border-radius: var(--border-radius-sm);
}

a.wikilink:hover {
  border-bottom-style: solid;
  background-color: var(--border-color);
}

a.wikilink.broken {
  color: var(--text-muted);
  border-bottom-color: #ff4757;
  background-color: rgba(255, 71, 87, 0.05);
}

a.wikilink.broken:hover {
  color: #ff4757;
  background-color: rgba(255, 71, 87, 0.1);
}

/* Lists */
ol, ul {
  padding-left: 24px;
  margin-bottom: 1.5rem;
}

li {
  margin-bottom: 0.5rem;
}

li::marker {
  color: var(--text-accent);
}

/* Blockquotes */
blockquote {
  margin: 2rem 0;
  padding: 1rem 1.5rem;
  border-left: 4px solid var(--text-accent);
  background-color: var(--bg-secondary);
  border-radius: 0 var(--border-radius-md) var(--border-radius-md) 0;
  font-style: italic;
  color: var(--text-muted);
}

blockquote p:last-child {
  margin-bottom: 0;
}

/* Code & Code blocks */
code {
  font-family: var(--font-code);
  font-size: 0.9em;
  background-color: var(--code-bg);
  padding: 3px 6px;
  border-radius: var(--border-radius-sm);
  color: var(--text-accent-hover);
}

pre {
  background-color: var(--bg-secondary);
  border: 1px solid var(--border-color);
  border-radius: var(--border-radius-md);
  padding: 1.2rem;
  overflow-x: auto;
  margin: 1.8rem 0;
}

pre code {
  background: transparent;
  padding: 0;
  color: var(--text-main);
  font-size: 0.88em;
  display: block;
}

/* Keyboard formatting */
kbd {
  font-family: var(--font-code);
  background-color: var(--bg-secondary);
  border: 1px solid var(--border-color);
  border-bottom: 2px solid var(--text-muted);
  border-radius: var(--border-radius-sm);
  padding: 2px 5px;
  font-size: 0.8em;
  box-shadow: var(--shadow-sm);
}

/* Tables */
table {
  width: 100%;
  border-collapse: collapse;
  margin: 2rem 0;
  font-size: 0.95rem;
}

th, td {
  padding: 12px 16px;
  text-align: left;
  border-bottom: 1px solid var(--border-color);
}

th {
  font-family: var(--font-heading);
  font-weight: 600;
  background-color: var(--bg-secondary);
}

tr:hover td {
  background-color: var(--bg-secondary);
}

/* Cards & Grid Utilities */
.card-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(280px, 1fr));
  gap: 20px;
  margin: 2rem 0;
}

.card {
  background-color: var(--bg-secondary);
  border: 1px solid var(--border-color);
  border-radius: var(--border-radius-md);
  padding: 20px;
  box-shadow: var(--shadow-sm);
  transition: transform var(--transition-normal), box-shadow var(--transition-normal), border-color var(--transition-normal);
  text-decoration: none;
  color: var(--text-main);
}

.card:hover {
  transform: translateY(-4px);
  box-shadow: var(--shadow-md);
  border-color: var(--text-accent);
}

.card-title {
  font-family: var(--font-heading);
  font-size: 1.2rem;
  font-weight: 600;
  margin-top: 0;
  margin-bottom: 8px;
  color: var(--text-accent);
}

/* ==========================================================================
   PAGE HEADER, METADATA & TAGS
   ========================================================================== */

.page-title {
  margin-bottom: 0.5rem;
  margin-top: 0;
  font-size: 2.5rem;
  letter-spacing: -1px;
  background: linear-gradient(to right, var(--text-main), var(--text-accent-hover));
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
}

.page-subtitle {
  font-size: 1.15rem;
  color: var(--text-muted);
  margin-top: 0;
  margin-bottom: 1.5rem;
  font-family: var(--font-heading);
  line-height: 1.5;
}

.page-meta {
  font-size: 0.9em;
  color: var(--text-muted);
  margin: 0 0 2rem;
  font-family: var(--font-heading);
}

.meta-line {
  display: flex;
  align-items: center;
  flex-wrap: wrap;
  gap: 0.4rem 0.8rem;
}

a.tag {
  display: inline-block;
  background: var(--bg-secondary);
  color: var(--text-muted);
  padding: 0.2rem 0.6rem;
  border-radius: var(--border-radius-md);
  text-decoration: none;
  font-size: 0.85rem;
  font-family: var(--font-heading);
  font-weight: 500;
  border: 1px solid var(--border-color);
  transition: all var(--transition-fast);
}

a.tag:hover {
  background: var(--text-accent);
  color: #fff;
  border-color: var(--text-accent);
}

/* ==========================================================================
   TAG PAGE LIST
   ========================================================================== */

.tag-page-list {
  list-style: none;
  padding: 0;
  margin: 2rem 0;
}

.tag-page-list li {
  margin: 0.75rem 0;
  padding: 1rem 1.25rem;
  background: var(--bg-secondary);
  border-radius: var(--border-radius-md);
  border: 1px solid var(--border-color);
  transition: transform var(--transition-fast), box-shadow var(--transition-fast), border-color var(--transition-fast);
  display: flex;
  align-items: baseline;
  justify-content: space-between;
}

.tag-page-list li:hover {
  transform: translateX(4px);
  border-color: var(--text-accent);
  box-shadow: var(--shadow-sm);
}

.tag-page-list a {
  font-weight: 600;
  font-family: var(--font-heading);
  text-decoration: none;
  border-bottom: none;
}

.tag-page-list a:hover {
  border-bottom: none;
}

.tag-page-date {
  color: var(--text-muted);
  font-size: 0.85em;
  font-family: var(--font-heading);
  white-space: nowrap;
}

/* ==========================================================================
   ALERTS / CALLOUTS
   ========================================================================== */

.markdown-alert {
  margin: 1.5em 0;
  padding: 0.5em 1em;
  border-left: 4px solid var(--text-accent);
  background: var(--highlight-bg);
  border-radius: 0 var(--border-radius-md) var(--border-radius-md) 0;
}

.markdown-alert-title {
  font-weight: 700;
  margin-bottom: 0.5em;
  display: flex;
  align-items: center;
  gap: 8px;
  font-family: var(--font-heading);
}

.markdown-alert p:last-child {
  margin-bottom: 0;
}

.markdown-alert-note    { border-left-color: #0b6bcb; background: color-mix(in srgb, #0b6bcb 5%, transparent); }
.markdown-alert-tip     { border-left-color: #27ae60; background: color-mix(in srgb, #27ae60 5%, transparent); }
.markdown-alert-important { border-left-color: #8e44ad; background: color-mix(in srgb, #8e44ad 5%, transparent); }
.markdown-alert-warning { border-left-color: #e67e22; background: color-mix(in srgb, #e67e22 5%, transparent); }
.markdown-alert-caution { border-left-color: #d73030; background: color-mix(in srgb, #d73030 5%, transparent); }

[data-theme="dracula"] .markdown-alert-note    { border-left-color: #8be9fd; background: color-mix(in srgb, #8be9fd 8%, transparent); }
[data-theme="dracula"] .markdown-alert-tip     { border-left-color: #50fa7b; background: color-mix(in srgb, #50fa7b 8%, transparent); }
[data-theme="dracula"] .markdown-alert-important { border-left-color: #bd93f9; background: color-mix(in srgb, #bd93f9 8%, transparent); }
[data-theme="dracula"] .markdown-alert-warning { border-left-color: #ffb86c; background: color-mix(in srgb, #ffb86c 8%, transparent); }
[data-theme="dracula"] .markdown-alert-caution { border-left-color: #ff5555; background: color-mix(in srgb, #ff5555 8%, transparent); }

[data-theme="forest"] .markdown-alert-note    { border-left-color: #3f5e4d; background: color-mix(in srgb, #3f5e4d 5%, transparent); }
[data-theme="forest"] .markdown-alert-tip     { border-left-color: #567e69; background: color-mix(in srgb, #567e69 5%, transparent); }
[data-theme="forest"] .markdown-alert-important { border-left-color: #8cb89f; background: color-mix(in srgb, #8cb89f 5%, transparent); }
[data-theme="forest"] .markdown-alert-warning { border-left-color: #c47d3f; background: color-mix(in srgb, #c47d3f 5%, transparent); }
[data-theme="forest"] .markdown-alert-caution { border-left-color: #c44d3f; background: color-mix(in srgb, #c44d3f 5%, transparent); }

/* ==========================================================================
   TASK LIST CHECKBOXES
   ========================================================================== */

input[type="checkbox"] {
  width: 1.25em;
  height: 1.25em;
  margin-right: 0.4em;
  vertical-align: text-bottom;
  cursor: pointer;
  accent-color: var(--text-accent);
}

.toc {
  background: var(--bg-secondary);
  border: 1px solid var(--border-color);
  border-radius: var(--border-radius-md);
  padding: 8px 12px;
  margin: 8px 0 14px;
  font-size: 0.85rem;
  line-height: 1.35;
}
.toc summary {
  display: flex;
  align-items: center;
  justify-content: space-between;
  cursor: pointer;
  font-weight: 600;
  color: var(--text-accent);
  user-select: none;
  padding: 3px 0;
  list-style: none; /* Hide default triangle */
}
.toc summary::-webkit-details-marker {
  display: none; /* Hide default triangle WebKit */
}
.toc summary::after {
  content: "▶";
  font-size: 0.65rem;
  transition: transform var(--transition-fast) ease;
  color: var(--text-muted);
}
.toc[open] summary::after {
  transform: rotate(90deg);
}
.toc[open] summary {
  margin-bottom: 6px;
}
.toc summary:hover {
  color: var(--text-accent-hover);
}
.toc nav ul {
  list-style: none;
  margin: 0;
  padding-left: 0;
}
.toc li {
  margin: 1px 0;
  list-style: none;
}
.toc a {
  display: block;
  color: var(--text-muted);
  text-decoration: none;
  padding: 2px 2px;
  border-radius: 3px;
  transition: background var(--transition-fast), color var(--transition-fast);
}
.toc a:hover {
  background: var(--highlight-bg);
  color: var(--text-main);
  text-decoration: none;
}
.toc-sublist {
  font-size: 0.92em;
  padding-left: 0.8rem !important;
  border-left: 1px solid var(--border-color);
  margin-left: 0.2rem;
  margin-top: 2px;
  margin-bottom: 2px;
}
h2:target, h3:target, h4:target, h5:target, h6:target {
  scroll-margin-top: 12px;
  background: var(--highlight-bg);
  padding-left: 6px;
  margin-left: -6px;
  border-radius: 4px;
}

/* responsive two-col TOC sidebar on wide screens (left) */
.main-with-toc {
  display: block;
}
.prose-content {
  min-width: 0;
}
@media (min-width: 860px) {
  .main-with-toc {
    display: flex;
    gap: 24px;
  }
  .main-with-toc > .toc {
    flex: 0 0 180px;
    position: sticky;
    top: 20px;
    align-self: flex-start;
    background: var(--bg-secondary);
    border: 1px solid var(--border-color);
    border-radius: var(--border-radius-md);
    padding: 8px 10px;
    font-size: 0.80rem;
    line-height: 1.3;
    max-height: calc(100vh - 100px);
    overflow: auto;
  }
  .main-with-toc > .toc summary {
    display: none; /* headless sidebar on desk */
  }
  .main-with-toc > .toc a {
    text-decoration: none;
  }
  .main-with-toc .prose-content {
    flex: 1;
  }
}