/* True Notion-Style Design System */

/* ================================
   CSS Custom Properties
   ================================ */
:root {
  /* Colors - Actual Notion palette */
  --bg-primary: #FFFFFF;
  --bg-secondary: #F7F6F3;
  --bg-hover: rgba(55, 53, 47, 0.04);
  --bg-active: rgba(55, 53, 47, 0.08);
  
  --text-primary: #37352F;
  --text-secondary: rgba(55, 53, 47, 0.65);
  --text-tertiary: rgba(55, 53, 47, 0.45);
  --text-placeholder: rgba(55, 53, 47, 0.35);
  
  --accent-blue: #2383E2;
  --accent-blue-bg: rgba(35, 131, 226, 0.1);
  
  --divider: rgba(55, 53, 47, 0.09);
  
  --shadow-sm: rgba(15, 15, 15, 0.04) 0px 0px 0px 1px, rgba(15, 15, 15, 0.03) 0px 3px 6px;
  --shadow-md: rgba(15, 15, 15, 0.05) 0px 0px 0px 1px, rgba(15, 15, 15, 0.1) 0px 5px 10px, rgba(15, 15, 15, 0.2) 0px 15px 40px;
  
  /* Typography - Notion uses system serif for titles */
  --font-title: 'Georgia', 'Times New Roman', serif;
  --font-body: -apple-system, BlinkMacSystemFont, 'Segoe UI', Helvetica, Arial, sans-serif;
  --font-mono: 'SFMono-Regular', Menlo, Consolas, monospace;
  
  /* Spacing */
  --page-width: 900px;
  --content-width: 708px;
  --page-padding: 96px;
  --page-padding-mobile: 24px;
  
  /* Roundings - Notion uses subtle roundings */
  --radius-sm: 3px;
  --radius-md: 4px;
  --radius-lg: 6px;
  
  /* Transitions */
  --transition: 20ms ease-in;
}

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

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

body {
  font-family: var(--font-body);
  font-size: 16px;
  line-height: 1.5;
  color: var(--text-primary);
  background-color: var(--bg-primary);
}

/* ================================
   Typography - Notion Style
   ================================ */
h1 {
  font-family: var(--font-title);
  font-size: 40px;
  font-weight: 700;
  line-height: 1.2;
  color: var(--text-primary);
  letter-spacing: -0.02em;
}

h2 {
  font-family: var(--font-title);
  font-size: 1.875em;
  font-weight: 600;
  line-height: 1.3;
  margin-top: 2em;
  margin-bottom: 0.25em;
}

h3 {
  font-family: var(--font-title);
  font-size: 1.5em;
  font-weight: 600;
  line-height: 1.3;
  margin-top: 1.75em;
  margin-bottom: 0.25em;
}

h4 {
  font-size: 1.25em;
  font-weight: 600;
  margin-top: 1.5em;
  margin-bottom: 0.25em;
}

p {
  margin-top: 0;
  margin-bottom: 1em;
  font-size: 16px;
  line-height: 1.7;
}

a {
  color: var(--text-primary);
  text-decoration: underline;
  text-decoration-color: rgba(55, 53, 47, 0.4);
  text-underline-offset: 2px;
  transition: var(--transition);
}

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

strong, b {
  font-weight: 600;
}

/* Lists */
ul, ol {
  margin: 0.5em 0 1em 0;
  padding-left: 1.7em;
}

li {
  margin-bottom: 0.35em;
  line-height: 1.7;
}

li:last-child {
  margin-bottom: 0;
}

/* Images */
img {
  max-width: 100%;
  height: auto;
  border-radius: var(--radius-sm);
}

/* Code */
code {
  font-family: var(--font-mono);
  font-size: 85%;
  background: rgba(135, 131, 120, 0.15);
  padding: 0.2em 0.4em;
  border-radius: var(--radius-sm);
  color: #EB5757;
}

pre {
  margin: 1.5em 0;
  padding: 20px 24px;
  background: var(--bg-secondary);
  border-radius: var(--radius-md);
  overflow-x: auto;
  font-size: 14px;
  line-height: 1.6;
}

pre code {
  background: none;
  padding: 0;
  color: inherit;
}

/* Blockquote */
blockquote {
  margin: 1.5em 0;
  padding: 0.5em 0 0.5em 1.25em;
  border-left: 3px solid var(--text-primary);
  font-size: 16px;
}

blockquote p {
  margin-bottom: 0.5em;
}

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

/* Divider */
hr {
  border: none;
  height: 1px;
  background: var(--divider);
  margin: 2em 0;
}

/* ================================
   Page Layout
   ================================ */
.notion-page {
  width: 100%;
  max-width: var(--page-width);
  margin: 0 auto;
  padding: 80px var(--page-padding);
}

@media (max-width: 768px) {
  .notion-page {
    padding: 48px var(--page-padding-mobile);
  }
}

/* ================================
   Page Header
   ================================ */
.notion-header {
  margin-bottom: 40px;
}

.notion-icon {
  width: 78px;
  height: 78px;
  font-size: 78px;
  line-height: 1;
  margin-bottom: 8px;
  position: relative;
}

.notion-icon img {
  width: 100%;
  height: 100%;
  border-radius: var(--radius-lg);
}

.notion-title {
  font-family: var(--font-title);
  font-size: 40px;
  font-weight: 700;
  line-height: 1.2;
  color: var(--text-primary);
  margin-bottom: 4px;
}

.notion-subtitle {
  color: var(--text-secondary);
  font-size: 14px;
}

/* ================================
   Content Blocks - Notion Style
   ================================ */
.notion-block {
  position: relative;
  padding: 3px 2px;
  margin-left: -2px;
  margin-right: -2px;
  border-radius: var(--radius-sm);
  transition: background var(--transition);
}

.notion-block:hover {
  background: var(--bg-hover);
}

/* ================================
   Callout Box
   ================================ */
.notion-callout {
  display: flex;
  align-items: flex-start;
  gap: 8px;
  padding: 16px 16px 16px 12px;
  background: var(--bg-secondary);
  border-radius: var(--radius-sm);
  margin: 8px 0;
}

.notion-callout-icon {
  flex-shrink: 0;
  width: 24px;
  height: 24px;
  font-size: 20px;
  line-height: 24px;
}

.notion-callout-content {
  flex: 1;
  min-width: 0;
}

/* ================================
   Database/Table Style List
   ================================ */
.notion-list {
  list-style: none;
  padding: 0;
  margin: 8px 0;
}

.notion-list-item {
  display: flex;
  align-items: center;
  padding: 6px 8px;
  margin: 0 -8px;
  border-radius: var(--radius-sm);
  transition: background var(--transition);
  text-decoration: none;
  color: inherit;
}

.notion-list-item:hover {
  background: var(--bg-hover);
}

.notion-list-item a {
  display: flex;
  align-items: center;
  width: 100%;
  text-decoration: none;
  color: inherit;
}

.notion-list-icon {
  flex-shrink: 0;
  width: 20px;
  height: 20px;
  margin-right: 6px;
  color: var(--text-tertiary);
  display: flex;
  align-items: center;
  justify-content: center;
}

.notion-list-icon svg {
  width: 16px;
  height: 16px;
}

.notion-list-title {
  flex: 1;
  font-size: 14px;
  color: var(--text-primary);
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
}

.notion-list-meta {
  flex-shrink: 0;
  font-size: 12px;
  color: var(--text-tertiary);
  margin-left: 8px;
}

/* ================================
   Card Grid (Recently Visited style)
   ================================ */
.notion-card-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(180px, 1fr));
  gap: 16px;
  margin: 16px 0;
}

.notion-card {
  display: flex;
  flex-direction: column;
  padding: 12px;
  background: var(--bg-secondary);
  border-radius: var(--radius-lg);
  text-decoration: none;
  color: inherit;
  transition: background var(--transition);
}

.notion-card:hover {
  background: var(--bg-active);
}

.notion-card-icon {
  width: 32px;
  height: 32px;
  margin-bottom: 8px;
  display: flex;
  align-items: center;
  justify-content: center;
  color: var(--text-tertiary);
}

.notion-card-icon img {
  max-width: 100%;
  max-height: 100%;
}

.notion-card-title {
  font-size: 14px;
  font-weight: 500;
  color: var(--text-primary);
  margin-bottom: 4px;
}

.notion-card-meta {
  font-size: 12px;
  color: var(--text-tertiary);
}

/* ================================
   Section Headers
   ================================ */
.notion-section {
  margin-top: 40px;
}

.notion-section-header {
  display: flex;
  align-items: center;
  gap: 6px;
  margin-bottom: 8px;
  font-size: 12px;
  font-weight: 500;
  color: var(--text-secondary);
  text-transform: uppercase;
  letter-spacing: 0.03em;
}

.notion-section-header svg {
  width: 14px;
  height: 14px;
  color: var(--text-tertiary);
}

/* ================================
   Property Row (like Notion page properties)
   ================================ */
.notion-property {
  display: flex;
  align-items: center;
  padding: 6px 0;
  font-size: 14px;
}

.notion-property-icon {
  flex-shrink: 0;
  width: 24px;
  height: 24px;
  display: flex;
  align-items: center;
  justify-content: center;
  color: var(--text-tertiary);
  margin-right: 4px;
}

.notion-property-icon svg {
  width: 16px;
  height: 16px;
}

.notion-property-name {
  width: 120px;
  flex-shrink: 0;
  color: var(--text-secondary);
  font-size: 14px;
}

.notion-property-value {
  flex: 1;
  color: var(--text-primary);
}

/* ================================
   Tags/Pills
   ================================ */
.notion-tag {
  display: inline-flex;
  align-items: center;
  padding: 2px 8px;
  border-radius: var(--radius-sm);
  font-size: 12px;
  font-weight: 500;
}

.notion-tag-gray {
  background: rgba(206, 205, 202, 0.5);
  color: rgba(55, 53, 47, 0.65);
}

.notion-tag-blue {
  background: rgba(211, 229, 239, 1);
  color: rgba(24, 51, 71, 1);
}

/* ================================
   Avatar
   ================================ */
.notion-avatar {
  width: 24px;
  height: 24px;
  border-radius: 50%;
  object-fit: cover;
  background-size: cover;
  background-position: center;
}

.notion-avatar-lg {
  width: 72px;
  height: 72px;
}

/* ================================
   Link with Icon
   ================================ */
.notion-link {
  display: inline-flex;
  align-items: center;
  gap: 4px;
  padding: 4px 6px;
  margin: -4px -6px;
  border-radius: var(--radius-sm);
  text-decoration: none;
  color: var(--text-primary);
  transition: background var(--transition);
}

.notion-link:hover {
  background: var(--bg-hover);
}

.notion-link svg {
  width: 16px;
  height: 16px;
  color: var(--text-tertiary);
}

/* ================================
   Back navigation
   ================================ */
.notion-breadcrumb {
  display: inline-flex;
  align-items: center;
  gap: 4px;
  padding: 4px 8px;
  margin: -4px -8px 16px;
  border-radius: var(--radius-sm);
  font-size: 14px;
  color: var(--text-secondary);
  text-decoration: none;
  transition: background var(--transition);
}

.notion-breadcrumb:hover {
  background: var(--bg-hover);
  text-decoration: none;
}

.notion-breadcrumb .notion-avatar {
  width: 20px;
  height: 20px;
}

/* ================================
   Selection Share Popup
   ================================ */
.notion-share-popup {
  position: absolute;
  display: flex;
  align-items: center;
  gap: 2px;
  padding: 4px;
  background: var(--text-primary);
  border-radius: var(--radius-lg);
  box-shadow: var(--shadow-md);
  z-index: 1000;
  opacity: 0;
  visibility: hidden;
  transform: translateY(8px);
  transition: opacity 100ms ease, transform 100ms ease, visibility 100ms ease;
}

.notion-share-popup.visible {
  opacity: 1;
  visibility: visible;
  transform: translateY(0);
}

.notion-share-popup::after {
  content: '';
  position: absolute;
  bottom: -5px;
  left: 50%;
  transform: translateX(-50%);
  border-left: 6px solid transparent;
  border-right: 6px solid transparent;
  border-top: 6px solid var(--text-primary);
}

.notion-share-btn {
  display: flex;
  align-items: center;
  justify-content: center;
  width: 28px;
  height: 28px;
  background: transparent;
  border: none;
  border-radius: var(--radius-sm);
  color: rgba(255, 255, 255, 0.8);
  cursor: pointer;
  transition: background var(--transition), color var(--transition);
}

.notion-share-btn:hover {
  background: rgba(255, 255, 255, 0.1);
  color: white;
}

.notion-share-btn svg {
  width: 16px;
  height: 16px;
}

/* ================================
   Article Content
   ================================ */
.notion-content {
  margin-top: 24px;
}

.notion-content h2:first-child,
.notion-content h3:first-child {
  margin-top: 0;
}

.notion-content img {
  display: block;
  margin: 1.5em auto;
  max-width: 100%;
  border-radius: var(--radius-md);
  box-shadow: var(--shadow-sm);
}

/* ================================
   Footer / Social
   ================================ */
.notion-footer {
  margin-top: 48px;
  padding-top: 24px;
}

.notion-social {
  display: flex;
  align-items: center;
  gap: 4px;
}

.notion-social-link {
  display: flex;
  align-items: center;
  justify-content: center;
  width: 32px;
  height: 32px;
  border-radius: var(--radius-sm);
  color: var(--text-tertiary);
  text-decoration: none;
  transition: background var(--transition), color var(--transition);
}

.notion-social-link:hover {
  background: var(--bg-hover);
  color: var(--text-primary);
}

.notion-social-link svg {
  width: auto;
  height: 16px;
  flex-shrink: 0;
}

/* ================================
   Utilities
   ================================ */
.text-secondary {
  color: var(--text-secondary);
}

.text-sm {
  font-size: 14px;
}

.mt-0 { margin-top: 0; }
.mt-1 { margin-top: 8px; }
.mt-2 { margin-top: 16px; }
.mt-3 { margin-top: 24px; }
.mt-4 { margin-top: 32px; }
.mb-0 { margin-bottom: 0; }
.mb-1 { margin-bottom: 8px; }
.mb-2 { margin-bottom: 16px; }

.hidden {
  position: absolute;
  left: -9999px;
  overflow: hidden;
}

/* ================================
   Logo Grid - Notion card style
   ================================ */
.notion-logo-grid {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 8px;
}

@media (max-width: 640px) {
  .notion-logo-grid {
    grid-template-columns: repeat(2, 1fr);
  }
}

.notion-logo-item {
  display: flex;
  align-items: center;
  justify-content: center;
  padding: 16px 12px;
  background: var(--bg-secondary);
  border-radius: var(--radius-lg);
  transition: background var(--transition);
}

.notion-logo-item:hover {
  background: var(--bg-active);
}

.notion-logo-item img {
  max-height: 24px;
  width: auto;
  opacity: 0.6;
  filter: grayscale(100%);
  transition: opacity var(--transition), filter var(--transition);
}

.notion-logo-item:hover img {
  opacity: 0.9;
  filter: grayscale(0%);
}

/* ================================
   Newsletter Form
   ================================ */
.notion-newsletter {
  margin-top: 24px;
  padding: 20px 24px;
  background: var(--bg-secondary);
  border-radius: var(--radius-lg);
}

.notion-newsletter-text {
  margin: 0 0 12px 0;
  padding: 0;
  font-size: 14px;
  color: var(--text-secondary);
}

.notion-newsletter-row {
  display: flex;
  gap: 8px;
}

.notion-newsletter-input {
  flex: 1;
  padding: 8px 12px;
  font-family: var(--font-body);
  font-size: 14px;
  color: var(--text-primary);
  background: var(--bg-primary);
  border: 1px solid var(--divider);
  border-radius: var(--radius-md);
  outline: none;
  transition: border-color var(--transition), box-shadow var(--transition);
}

.notion-newsletter-input::placeholder {
  color: var(--text-placeholder);
}

.notion-newsletter-input:focus {
  border-color: var(--accent-blue);
  box-shadow: 0 0 0 2px var(--accent-blue-bg);
}

.notion-newsletter-btn {
  padding: 8px 16px;
  font-family: var(--font-body);
  font-size: 14px;
  font-weight: 500;
  color: white;
  background: var(--text-primary);
  border: none;
  border-radius: var(--radius-md);
  cursor: pointer;
  transition: background var(--transition), transform var(--transition);
}

.notion-newsletter-btn:hover {
  background: #1a1a1a;
}

.notion-newsletter-btn:active {
  transform: scale(0.98);
}

@media (max-width: 480px) {
  .notion-newsletter-row {
    flex-direction: column;
  }
  
  .notion-newsletter-btn {
    width: 100%;
  }
}

.notion-newsletter-success {
  margin: 0;
  padding: 0;
  font-size: 14px;
  color: var(--text-secondary);
}

/* ================================
   Easter Eggs & Game UI
   ================================ */
.coin-overlay {
  position: absolute;
  inset: 0;
  display: flex;
  align-items: center;
  justify-content: center;
  border-radius: 50%;
  background: radial-gradient(circle at 30% 30%, #fff5cc, #d79e28);
  color: #5c3d00;
  font-weight: 700;
  font-size: 20px;
  text-transform: uppercase;
  opacity: 0;
  transform: scale(0.8);
  transition: opacity 200ms ease, transform 200ms ease;
  pointer-events: none;
  cursor: default;
  perspective: 800px;
}

.coin-overlay.visible {
  opacity: 1;
  transform: scale(1);
}

.coin-hidden {
  visibility: hidden;
}

.coin-flip {
  position: relative;
  width: 80%;
  height: 80%;
  transform-style: preserve-3d;
  transform: rotateY(0deg);
  --coin-final-rotation: 0deg;
}

.coin-flip--animate {
  animation: coinFlip 1.8s ease-out forwards;
}

.coin-overlay[data-result="tails"] .coin-flip {
  --coin-final-rotation: 180deg;
}

@keyframes coinFlip {
  0% {
    transform: rotateY(0deg);
  }
  70% {
    transform: rotateY(900deg);
  }
  100% {
    transform: rotateY(var(--coin-final-rotation));
  }
}

.coin-face {
  position: absolute;
  inset: 0;
  display: flex;
  align-items: center;
  justify-content: center;
  backface-visibility: hidden;
}

.coin-face svg {
  width: 70%;
  height: 70%;
  filter: drop-shadow(0 4px 8px rgba(0, 0, 0, 0.3));
}

.coin-face.coin-tails {
  transform: rotateY(180deg);
}

.racing-overlay {
  position: fixed;
  inset: 0;
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  gap: 16px;
  background: rgba(0, 0, 0, 0.92);
  z-index: 9999;
  opacity: 0;
  visibility: hidden;
  pointer-events: none;
  transition: opacity 200ms ease;
  padding: 32px 20px;
}

.racing-overlay.visible {
  opacity: 1;
  visibility: visible;
  pointer-events: auto;
}

.racing-overlay__hud {
  display: flex;
  flex-direction: column;
  gap: 4px;
  text-align: center;
  color: #f3f3f3;
  font-family: var(--font-mono);
}

#racing-canvas {
  width: min(420px, 90vw);
  max-height: 80vh;
  border: 2px solid rgba(255, 255, 255, 0.2);
  border-radius: 8px;
  background: #000;
  box-shadow: 0 10px 40px rgba(0, 0, 0, 0.6);
}

.racing-close-btn {
  padding: 8px 18px;
  border-radius: 999px;
  border: 1px solid rgba(255, 255, 255, 0.4);
  background: transparent;
  color: #ffffff;
  font-family: var(--font-mono);
  cursor: pointer;
  transition: background 150ms ease, color 150ms ease;
}

.racing-close-btn:hover {
  background: rgba(255, 255, 255, 0.15);
  color: #fff;
}

/* ================================
   Hacker Theme Toggle
   ================================ */
body.hacker-theme {
  --bg-primary: #010101;
  --bg-secondary: #030b03;
  --bg-hover: rgba(0, 255, 128, 0.08);
  --bg-active: rgba(0, 255, 128, 0.15);
  --text-primary: #5cff80;
  --text-secondary: rgba(92, 255, 128, 0.75);
  --text-tertiary: rgba(92, 255, 128, 0.45);
  --text-placeholder: rgba(92, 255, 128, 0.3);
  --divider: rgba(92, 255, 128, 0.2);
  --accent-blue: #5cff80;
  --accent-blue-bg: rgba(92, 255, 128, 0.15);
  --font-body: 'SFMono-Regular', Menlo, Consolas, monospace;
  --font-title: 'SFMono-Regular', Menlo, Consolas, monospace;
  background: var(--bg-primary);
  color: var(--text-primary);
}

body.hacker-theme .notion-page {
  background: var(--bg-primary);
}

body.hacker-theme .notion-logo-item,
body.hacker-theme .notion-newsletter {
  background: rgba(0, 0, 0, 0.6);
  border: 1px solid rgba(92, 255, 128, 0.2);
}

body.hacker-theme .notion-logo-item img,
body.hacker-theme .notion-logo-item svg {
  filter: invert(1) hue-rotate(90deg);
  opacity: 1;
}

body.hacker-theme .notion-newsletter-input {
  background: rgba(0, 0, 0, 0.4);
  color: var(--text-primary);
  border-color: rgba(92, 255, 128, 0.3);
}

body.hacker-theme .notion-newsletter-btn {
  background: rgba(0, 0, 0, 0.8);
  border: 1px solid rgba(92, 255, 128, 0.5);
  color: var(--text-primary);
  text-shadow: 0 0 6px rgba(92, 255, 128, 0.6);
}

body.hacker-theme .notion-logo-item:hover,
body.hacker-theme .notion-newsletter-btn:hover {
  background: rgba(0, 255, 128, 0.12);
}