/* ───────────────────────────────────────────────────────────
   Academic Notebook · Scholarly Notebook Theme
   ─────────────────────────────────────────────────────────── */

/* ═══════════════════════════════════════════════════════════
   1. Font & Typography
   ═══════════════════════════════════════════════════════════ */
:root {
  --md-text-font: "LXGW WenKai", "Noto Serif SC", "Source Han Serif SC",
    "STSong", "SimSun", "Songti SC", "Noto Serif CJK SC", serif;
}

body {
  line-height: 1.8;
}

/* Headings — bolder weight, tighter spacing */
.md-typeset h1,
.md-typeset h2,
.md-typeset h3 {
  font-weight: 700;
  letter-spacing: -0.01em;
}
.md-typeset h1 {
  font-size: 1.85rem;
  margin-top: 0;
}
.md-typeset h2 {
  font-size: 1.45rem;
  margin-top: 1.8em;
  margin-bottom: 0.6em;
}
.md-typeset h3 {
  font-size: 1.15rem;
  margin-top: 1.4em;
  margin-bottom: 0.5em;
}

/* Body paragraph breathing room */
.md-typeset p {
  margin-bottom: 1.2em;
}

/* List spacing */
.md-typeset ul,
.md-typeset ol {
  margin-bottom: 1em;
}
.md-typeset li {
  margin-bottom: 0.3em;
}

/* ═══════════════════════════════════════════════════════════
   2. Math Formulas (MathJax)
   ═══════════════════════════════════════════════════════════ */

/* Unified text sizing inside math */
.mjx-mtext {
  font-size: 1rem !important;
}

/* Inline math line-height */
mjx-container {
  line-height: 1.6;
}

/* ── Display math ($$) blocks — "floating note" style ── */
mjx-container[display="true"] {
  --math-bg: rgba(128, 128, 128, 0.035);
  --math-border: rgba(128, 128, 128, 0.10);
  background: var(--math-bg);
  border-left: 3px solid var(--math-border);
  border-radius: 0 8px 8px 0;
  padding: 1rem 1.2rem;
  margin: 1.2rem 0;
  transition:
    box-shadow 0.25s ease,
    transform 0.25s ease;
}

/* Subtle shadow lift on hover */
mjx-container[display="true"]:hover {
  box-shadow: 0 2px 14px rgba(0, 0, 0, 0.06);
  transform: translateY(-1px);
}

/* ── \boxed{} enhanced border ── */
.mjx-menclose {
  border-width: 1.5px !important;
  border-radius: 4px;
  padding: 2px 6px !important;
}

/* ═══════════════════════════════════════════════════════════
   3. Blockquote — "margin note" style
   ═══════════════════════════════════════════════════════════ */
.md-typeset blockquote {
  font-size: 0.9rem;
  line-height: 1.7;
  color: var(--md-default-fg-color--light);
  background: transparent;
  border-left: 3px solid var(--md-default-fg-color--lighter);
  padding: 0.5rem 1rem;
  margin: 1rem 0;
  opacity: 0.85;
}

/* ═══════════════════════════════════════════════════════════
   4. Tables
   ═══════════════════════════════════════════════════════════ */
.md-typeset table {
  border-radius: 8px;
  overflow: hidden;
  display: block;
  max-width: 100%;
  overflow-x: auto;
}

.md-typeset table:not([class]) {
  display: table;
}

.md-typeset table thead th {
  font-weight: 600;
  font-size: 0.9rem;
  background: var(--md-default-fg-color--lightest);
  padding: 0.75rem 1rem;
  border-bottom: 2px solid var(--md-default-fg-color--lighter);
}

.md-typeset table tbody tr:nth-child(even) {
  background: rgba(128, 128, 128, 0.03);
}

.md-typeset table td {
  padding: 0.65rem 1rem;
}

/* ═══════════════════════════════════════════════════════════
   5. Custom Scrollbar
   ═══════════════════════════════════════════════════════════ */
::-webkit-scrollbar {
  width: 7px;
  height: 7px;
}
::-webkit-scrollbar-track {
  background: transparent;
}
::-webkit-scrollbar-thumb {
  background: var(--md-default-fg-color--lighter);
  border-radius: 4px;
}
::-webkit-scrollbar-thumb:hover {
  background: var(--md-default-fg-color--light);
}

/* Firefox */
* {
  scrollbar-width: thin;
  scrollbar-color: var(--md-default-fg-color--lighter) transparent;
}

/* ═══════════════════════════════════════════════════════════
   6. Code Blocks
   ═══════════════════════════════════════════════════════════ */
.md-typeset code {
  font-size: 0.88em;
  border-radius: 4px;
  padding: 0.15em 0.4em;
}

.md-typeset pre > code {
  border-radius: 8px;
}

/* ═══════════════════════════════════════════════════════════
   7. Back-to-Top Button
   ═══════════════════════════════════════════════════════════ */
.md-top {
  font-size: 0;
  border-radius: 50%;
  width: 42px;
  height: 42px;
  box-shadow: 0 2px 12px rgba(0, 0, 0, 0.15);
  transition: box-shadow 0.2s ease, background 0.2s ease;
}
.md-top svg {
  width: 20px;
  height: 20px;
}
.md-top:hover {
  box-shadow: 0 4px 16px rgba(0, 0, 0, 0.2);
}

/* ═══════════════════════════════════════════════════════════
   8. Color Theme: Slate Gray (墨灰)
   ═══════════════════════════════════════════════════════════ */

/* ── Light scheme ── */
[data-md-color-primary="slate-gray"][data-md-color-scheme="default"] {
  --md-primary-fg-color: #546e7a;
  --md-primary-fg-color--light: #819ca9;
  --md-primary-fg-color--dark: #29434e;
  --md-primary-bg-color: #ffffff;
  --md-accent-fg-color: #607d8b;
  --md-typeset-a-color: #455a64;
  --md-default-bg-color: #faf8f5;
}

/* ── Dark scheme ── */
[data-md-color-primary="slate-gray"][data-md-color-scheme="slate"] {
  --md-primary-fg-color: #607d8b;
  --md-primary-fg-color--light: #8eacbb;
  --md-primary-fg-color--dark: #34515e;
  --md-primary-bg-color: #ffffff;
  --md-accent-fg-color: #90a4ae;
  --md-typeset-a-color: #90a4ae;
}

/* ═══════════════════════════════════════════════════════════
   9. Scheme Adaptations (Light & Dark)
   ═══════════════════════════════════════════════════════════ */

/* ── Light mode — warm paper texture ── */
[data-md-color-scheme="default"] {
  --md-default-bg-color: #fefefa;
}

[data-md-color-scheme="default"] .md-main {
  background:
    linear-gradient(
      to bottom,
      rgba(139, 119, 90, 0.025) 0%,
      transparent 100%
    );
}

/* ── Warm mode — sepia paper, easier on the eyes than pure white ── */
[data-md-color-scheme="warm"] {
  --md-default-bg-color: #f5efe4;
  --md-default-fg-color: #3b3228;
  --md-default-fg-color--light: #6b5e52;
  --md-default-fg-color--lighter: #9b8e80;
  --md-default-fg-color--lightest: #d8cfc2;
  --md-typeset-color: #3b3228;
  --md-typeset-a-color: #8b5e3c;
  --md-accent-fg-color: #a1887f;
  --md-code-bg-color: #ede0d0;
  --md-code-fg-color: #4e4034;
  --md-admonition-bg-color: rgba(141, 110, 99, 0.08);
  --md-footer-bg-color: #3b3228;
  --md-footer-bg-color--dark: #2b2420;
}

[data-md-color-scheme="warm"] .md-main {
  background:
    linear-gradient(
      to bottom,
      rgba(180, 150, 120, 0.04) 0%,
      transparent 100%
    );
}

/* Warm mode: math blocks */
[data-md-color-scheme="warm"] mjx-container[display="true"] {
  --math-bg: rgba(180, 150, 120, 0.08);
  --math-border: rgba(160, 130, 100, 0.18);
}

/* ── Dark mode — warm low-contrast gray (not pure black) ── */
[data-md-color-scheme="slate"] {
  --md-default-bg-color: #1b1d1f;
}

[data-md-color-scheme="slate"] .md-main {
  background:
    linear-gradient(
      to bottom,
      rgba(200, 190, 170, 0.02) 0%,
      transparent 100%
    );
}

/* Dark mode: math blocks use ultra-dark semi-transparent background */
[data-md-color-scheme="slate"] mjx-container[display="true"] {
  --math-bg: rgba(255, 255, 255, 0.025);
  --math-border: rgba(255, 255, 255, 0.07);
}

[data-md-color-scheme="slate"] mjx-container[display="true"]:hover {
  box-shadow: 0 2px 16px rgba(0, 0, 0, 0.3);
}

/* Dark mode: blockquote contrast */
[data-md-color-scheme="slate"] .md-typeset blockquote {
  opacity: 0.72;
}

/* Dark mode: table row striping */
[data-md-color-scheme="slate"] .md-typeset table tbody tr:nth-child(even) {
  background: rgba(255, 255, 255, 0.02);
}

/* Dark mode: better link contrast */
[data-md-color-scheme="slate"] {
  --md-typeset-a-color: #90a4ae;
}

/* ═══════════════════════════════════════════════════════════
   10. Theme Picker UI
   ═══════════════════════════════════════════════════════════ */
.md-theme-picker {
  position: relative;
  display: inline-flex;
  align-items: center;
}

.md-theme-trigger {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 36px;
  height: 36px;
  border: none;
  border-radius: 50%;
  background: transparent;
  color: var(--md-default-fg-color);
  cursor: pointer;
  transition: background 0.2s, transform 0.2s;
}
.md-theme-trigger:hover {
  background: var(--md-default-fg-color--lightest);
  transform: scale(1.08);
}
.md-theme-trigger:active {
  transform: scale(0.95);
}

.md-theme-menu {
  position: absolute;
  top: calc(100% + 8px);
  right: -8px;
  z-index: 100;
  min-width: 148px;
  padding: 8px 0;
  border-radius: 12px;
  background: var(--md-default-bg-color);
  box-shadow:
    0 0 0 1px var(--md-default-fg-color--lightest),
    0 8px 32px rgba(0, 0, 0, 0.18),
    0 2px 6px rgba(0, 0, 0, 0.08);
  opacity: 0;
  visibility: hidden;
  transform: translateY(-6px) scale(0.95);
  transition:
    opacity 0.18s cubic-bezier(0.4, 0, 0.2, 1),
    transform 0.18s cubic-bezier(0.4, 0, 0.2, 1),
    visibility 0.18s;
  transform-origin: top right;
}
.md-theme-menu.open {
  opacity: 1;
  visibility: visible;
  transform: translateY(0) scale(1);
}

/* Menu label */
.md-theme-menu::before {
  content: "配色方案";
  display: block;
  padding: 6px 16px 4px;
  font-size: 0.65rem;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.06em;
  color: var(--md-default-fg-color--light);
  opacity: 0.7;
}

.md-theme-item {
  display: flex;
  align-items: center;
  gap: 12px;
  width: 100%;
  padding: 9px 16px;
  border: none;
  border-left: 3px solid transparent;
  background: transparent;
  color: var(--md-default-fg-color);
  font-size: 0.82rem;
  font-family: inherit;
  cursor: pointer;
  text-align: left;
  transition:
    background 0.15s,
    border-color 0.2s,
    padding-left 0.2s;
  position: relative;
}
.md-theme-item:hover {
  background: var(--md-default-fg-color--lightest);
  border-left-color: var(--md-default-fg-color--lighter);
}
.md-theme-item.active {
  color: var(--md-primary-fg-color);
  font-weight: 600;
  background: color-mix(in srgb, var(--md-primary-fg-color) 8%, transparent);
  border-left-color: var(--md-primary-fg-color);
}

/* Active checkmark */
.md-theme-item.active::after {
  content: "";
  display: inline-block;
  width: 18px;
  height: 18px;
  margin-left: auto;
  flex-shrink: 0;
  border-radius: 50%;
  background: var(--md-primary-fg-color);
  mask-image: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' viewBox='0 0 24 24'%3E%3Cpath d='M9 16.17L4.83 12l-1.42 1.41L9 19 21 7l-1.41-1.41z' fill='black'/%3E%3C/svg%3E");
  mask-size: 14px;
  mask-position: center;
  mask-repeat: no-repeat;
  -webkit-mask-image: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' viewBox='0 0 24 24'%3E%3Cpath d='M9 16.17L4.83 12l-1.42 1.41L9 19 21 7l-1.41-1.41z' fill='black'/%3E%3C/svg%3E");
  -webkit-mask-size: 14px;
  -webkit-mask-position: center;
  -webkit-mask-repeat: no-repeat;
  animation: theme-check-pop 0.25s cubic-bezier(0.34, 1.56, 0.64, 1);
}

@keyframes theme-check-pop {
  from {
    transform: scale(0);
    opacity: 0;
  }
  to {
    transform: scale(1);
    opacity: 1;
  }
}

/* Color swatch preview */
.md-theme-dot {
  display: inline-block;
  width: 22px;
  height: 22px;
  border-radius: 6px;
  flex-shrink: 0;
  box-shadow:
    inset 0 1px 0 rgba(255, 255, 255, 0.25),
    0 1px 2px rgba(0, 0, 0, 0.12);
  transition: transform 0.2s, box-shadow 0.2s;
}
.md-theme-item:hover .md-theme-dot {
  transform: scale(1.1);
}
.md-theme-item.active .md-theme-dot {
  box-shadow:
    inset 0 1px 0 rgba(255, 255, 255, 0.25),
    0 0 0 2px var(--md-primary-fg-color),
    0 0 0 4px color-mix(in srgb, var(--md-primary-fg-color) 25%, transparent);
}

/* Menu item staggered entrance (supports up to 5 items) */
.md-theme-menu.open .md-theme-item:nth-child(2) {
  transition-delay: 0.02s;
}
.md-theme-menu.open .md-theme-item:nth-child(3) {
  transition-delay: 0.04s;
}
.md-theme-menu.open .md-theme-item:nth-child(4) {
  transition-delay: 0.06s;
}
.md-theme-menu.open .md-theme-item:nth-child(5) {
  transition-delay: 0.08s;
}
.md-theme-menu.open .md-theme-item:nth-child(6) {
  transition-delay: 0.1s;
}

/* ═══════════════════════════════════════════════════════════
   11. Eye-Protection Background Overrides
   ═══════════════════════════════════════════════════════════ */
[data-md-color-primary="amber"][data-md-color-scheme="default"] {
  --md-default-bg-color: #fdf6e3;
}
[data-md-color-primary="teal"][data-md-color-scheme="default"] {
  --md-default-bg-color: #f4faf5;
}
[data-md-color-primary="brown"][data-md-color-scheme="default"] {
  --md-default-bg-color: #faf3e6;
}

/* ═══════════════════════════════════════════════════════════
   12. Responsive: Prevent math overflow on mobile
   ═══════════════════════════════════════════════════════════ */
@media (max-width: 768px) {
  mjx-container[display="true"] {
    padding: 0.6rem 0.7rem;
    margin: 0.8rem 0;
    border-radius: 0 6px 6px 0;
    overflow-x: auto;
  }

  .md-typeset table {
    font-size: 0.85rem;
  }

  .md-typeset h1 {
    font-size: 1.5rem;
  }
  .md-typeset h2 {
    font-size: 1.25rem;
  }
  .md-typeset h3 {
    font-size: 1.05rem;
  }
}