/* ===================================
 * Base Styles
 * Reset & Global Typography
 * =================================== */

*, *::before, *::after {
  box-sizing: border-box;
  margin: 0;
  padding: 0;
}

html {
  font-size: 17px;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
  text-rendering: optimizeLegibility;
  scroll-behavior: smooth;
}

body {
  font: var(--md-sys-typescale-body-large);
  color: var(--md-sys-color-on-background);
  background-color: var(--md-sys-color-background);
  min-height: 100vh;
  overflow-x: hidden;
  transition: background-color var(--md-sys-motion-duration-medium) var(--md-sys-motion-easing-standard),
              color var(--md-sys-motion-duration-medium) var(--md-sys-motion-easing-standard);
}

/* ===================================
 * Selection
 * =================================== */
::selection {
  background-color: var(--md-sys-color-primary);
  color: var(--md-sys-color-on-primary);
}

/* ===================================
 * Scrollbar (Webkit)
 * =================================== */
::-webkit-scrollbar {
  width: 12px;
  height: 12px;
}

::-webkit-scrollbar-track {
  background: var(--md-sys-color-surface-container);
}

::-webkit-scrollbar-thumb {
  background: var(--md-sys-color-outline);
  border-radius: var(--md-sys-shape-corner-full);
  border: 3px solid var(--md-sys-color-surface-container);
}

::-webkit-scrollbar-thumb:hover {
  background: var(--md-sys-color-primary);
}

/* Firefox */
* {
  scrollbar-width: thin;
  scrollbar-color: var(--md-sys-color-outline) var(--md-sys-color-surface-container);
}

/* ===================================
 * Links
 * =================================== */
a {
  color: var(--md-sys-color-primary);
  text-decoration: none;
  transition: color var(--md-sys-motion-duration-short) var(--md-sys-motion-easing-standard);
}

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

a:focus-visible {
  outline: 2px solid var(--md-sys-color-primary);
  outline-offset: 2px;
  border-radius: var(--md-sys-shape-corner-extra-small);
}

/* ===================================
 * Headings
 * =================================== */
h1, h2, h3, h4, h5, h6 {
  color: var(--md-sys-color-on-surface);
  font-weight: 600;
  margin-top: 1.5em;
  margin-bottom: 0.5em;
  line-height: 1.3;
}

h1 {
  font: var(--md-sys-typescale-headline-large);
}

h2 {
  font: var(--md-sys-typescale-headline-medium);
}

h3 {
  font: var(--md-sys-typescale-headline-small);
}

h4 {
  font: var(--md-sys-typescale-title-large);
}

h5 {
  font: var(--md-sys-typescale-title-medium);
}

h6 {
  font: var(--md-sys-typescale-title-small);
  color: var(--md-sys-color-on-surface-variant);
}

/* ===================================
 * Paragraphs & Text
 * =================================== */
p {
  margin-bottom: 1em;
  line-height: 1.75;
}

strong, b {
  font-weight: 600;
}

em, i {
  font-style: italic;
}

small {
  font: var(--md-sys-typescale-body-small);
  color: var(--md-sys-color-on-surface-variant);
}

/* ===================================
 * Lists
 * =================================== */
ul, ol {
  margin-bottom: 1em;
  padding-left: 1.5em;
  line-height: 1.75;
}

li {
  margin-bottom: 0.25em;
}

ul li::marker {
  color: var(--md-sys-color-primary);
}

ol li::marker {
  color: var(--md-sys-color-primary);
  font-weight: 500;
}

/* Nested lists */
ul ul, ul ol, ol ul, ol ol {
  margin-top: 0.25em;
  margin-bottom: 0;
}

/* ===================================
 * Blockquotes
 * =================================== */
blockquote {
  background: var(--md-sys-color-surface-container);
  border-left: 4px solid var(--md-sys-color-primary);
  border-radius: 0 var(--md-sys-shape-corner-medium) var(--md-sys-shape-corner-medium) 0;
  padding: 1em 1.25em;
  margin: 1.5em 0;
  color: var(--md-sys-color-on-surface-variant);
}

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

/* ===================================
 * Horizontal Rule
 * =================================== */
hr {
  border: none;
  height: 1px;
  background: var(--md-sys-color-outline-variant);
  margin: 2em 0;
}

/* ===================================
 * Images & Media
 * =================================== */
img, video, audio, iframe {
  max-width: 100%;
  height: auto;
  border-radius: var(--md-sys-shape-corner-medium);
  display: block;
  margin: 1em auto;
}

/* ===================================
 * Tables
 * =================================== */
table {
  width: 100%;
  border-collapse: collapse;
  margin: 1.5em 0;
  font: var(--md-sys-typescale-body-medium);
  border-radius: var(--md-sys-shape-corner-medium);
  overflow: hidden;
}

thead {
  background: var(--md-sys-color-primary-container);
  color: var(--md-sys-color-on-primary-container);
}

th {
  font-weight: 500;
  text-align: left;
  padding: 0.75em 1em;
}

td {
  padding: 0.75em 1em;
  border-bottom: 1px solid var(--md-sys-color-outline-variant);
}

tbody tr:nth-child(even) {
  background: var(--md-sys-color-surface-container-low);
}

tbody tr:hover {
  background: var(--md-sys-color-surface-container);
}

/* ===================================
 * Code
 * =================================== */
code {
  font-family: var(--md-sys-typescale-font-family-mono);
  font-size: 0.875em;
  background: var(--md-sys-color-surface-container);
  color: var(--md-sys-color-primary);
  padding: 0.2em 0.4em;
  border-radius: var(--md-sys-shape-corner-small);
}

pre {
  background: var(--md-sys-color-surface-container-low);
  border: 1px solid var(--md-sys-color-outline-variant);
  border-radius: var(--md-sys-shape-corner-medium);
  padding: 1em;
  margin: 1.5em 0;
  overflow-x: auto;
  line-height: 1.5;
}

pre code {
  background: none;
  padding: 0;
  color: var(--md-sys-color-on-surface);
  font-size: 0.875em;
}

/* ===================================
 * Keyboard
 * =================================== */
kbd {
  font-family: var(--md-sys-typescale-font-family-mono);
  font-size: 0.875em;
  background: var(--md-sys-color-surface-container);
  border: 1px solid var(--md-sys-color-outline);
  border-radius: var(--md-sys-shape-corner-small);
  padding: 0.2em 0.5em;
  box-shadow: 0 2px 0 var(--md-sys-color-outline-variant);
}

/* ===================================
 * Mark / Highlight
 * =================================== */
mark {
  background: var(--md-sys-color-tertiary-container);
  color: var(--md-sys-color-on-tertiary-container);
  padding: 0.1em 0.3em;
  border-radius: var(--md-sys-shape-corner-extra-small);
}

/* ===================================
 * Details / Summary
 * =================================== */
details {
  background: var(--md-sys-color-surface-container);
  border: 1px solid var(--md-sys-color-outline-variant);
  border-radius: var(--md-sys-shape-corner-medium);
  padding: 1em;
  margin: 1em 0;
}

details[open] {
  background: var(--md-sys-color-surface-container-low);
}

summary {
  cursor: pointer;
  font-weight: 500;
  color: var(--md-sys-color-primary);
  padding: 0.5em 0;
  user-select: none;
}

summary:hover {
  color: var(--md-sys-color-on-primary-container);
}

/* ===================================
 * Utility Classes
 * =================================== */
.visually-hidden {
  position: absolute;
  width: 1px;
  height: 1px;
  padding: 0;
  margin: -1px;
  overflow: hidden;
  clip: rect(0, 0, 0, 0);
  white-space: nowrap;
  border: 0;
}

.text-primary {
  color: var(--md-sys-color-primary);
}

.text-on-surface-variant {
  color: var(--md-sys-color-on-surface-variant);
}

/* ===================================
 * Smooth Transitions
 * =================================== */
.fade-in {
  animation: fadeIn var(--md-sys-motion-duration-medium) var(--md-sys-motion-easing-standard);
}

@keyframes fadeIn {
  from {
    opacity: 0;
    transform: translateY(8px);
  }
  to {
    opacity: 1;
    transform: translateY(0);
  }
}

/* ===================================
 * Scroll Reveal
 * =================================== */
.reveal {
  opacity: 0;
  transform: translateY(24px);
  transition: opacity 0.6s ease, transform 0.6s cubic-bezier(0.2, 0.8, 0.2, 1);
}

.reveal.in {
  opacity: 1;
  transform: none;
}

/* Staggered reveal for children */
.reveal-stagger > * {
  opacity: 0;
  transform: translateY(16px);
  transition: opacity 0.5s ease, transform 0.5s cubic-bezier(0.2, 0.8, 0.2, 1);
}

.reveal-stagger.in > *:nth-child(1) { transition-delay: 0ms; }
.reveal-stagger.in > *:nth-child(2) { transition-delay: 60ms; }
.reveal-stagger.in > *:nth-child(3) { transition-delay: 120ms; }
.reveal-stagger.in > *:nth-child(4) { transition-delay: 180ms; }
.reveal-stagger.in > *:nth-child(5) { transition-delay: 240ms; }
.reveal-stagger.in > *:nth-child(6) { transition-delay: 300ms; }
.reveal-stagger.in > *:nth-child(7) { transition-delay: 360ms; }
.reveal-stagger.in > *:nth-child(8) { transition-delay: 420ms; }

.reveal-stagger.in > * {
  opacity: 1;
  transform: none;
}

/* ===================================
 * Loading Overlay — 移植自个人主页
 * =================================== */
.loading-overlay {
  position: fixed;
  inset: 0;
  z-index: 10000;
  display: flex;
  align-items: center;
  justify-content: center;
  background: rgba(245, 246, 251, 0.88);
  backdrop-filter: blur(12px);
  -webkit-backdrop-filter: blur(12px);
  opacity: 1;
  visibility: visible;
  transition: opacity .45s ease, visibility .45s ease;
}

[data-theme="dark"] .loading-overlay {
  background: rgba(15, 15, 26, 0.84);
}

@media (prefers-color-scheme: dark) {
  :root:not([data-theme="light"]) .loading-overlay {
    background: rgba(15, 15, 26, 0.84);
  }
}

.loading-overlay.loaded {
  opacity: 0;
  visibility: hidden;
  pointer-events: none;
}

.loading-overlay__mask {
  position: absolute;
  inset: 0;
  background: linear-gradient(180deg, rgba(255,255,255,.55), rgba(255,255,255,.88));
}

[data-theme="dark"] .loading-overlay__mask {
  background: linear-gradient(180deg, rgba(15,15,26,.50), rgba(15,15,26,.84));
}

@media (prefers-color-scheme: dark) {
  :root:not([data-theme="light"]) .loading-overlay__mask {
    background: linear-gradient(180deg, rgba(15,15,26,.50), rgba(15,15,26,.84));
  }
}

.loading-overlay__inner {
  position: relative;
  z-index: 1;
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 12px;
}

.loading-overlay__img {
  width: 80px;
  height: auto;
}

.loading-overlay__img img {
  width: 100%;
  height: auto;
  display: block;
  animation: jumping 1.5s linear infinite;
  transform-origin: center bottom;
}

@keyframes jumping {
  0%   { transform: translateY(0px); }
  20%  { transform: translateY(0px); }
  30%  { transform: translateY(-30px); }
  50%  { transform: translateY(0px); }
  60%  { transform: translateY(-15px); }
  80%  { transform: translateY(0px); }
  100% { transform: translateY(0px); }
}

.loading-overlay__text {
  width: 240px;
  height: 32px;
}

.loading-overlay__fallback-text {
  font-family: 'Google Sans', 'Noto Sans SC', sans-serif;
  font-size: 12px;
  letter-spacing: 0.26em;
  text-align: center;
  display: block;
  color: #d4a008;
}

[data-theme="dark"] .loading-overlay__fallback-text {
  color: #ffc30b;
}

@media (min-width: 768px) {
  .loading-overlay__img {
    width: 112px;
  }
  .loading-overlay__text {
    width: 320px;
    height: 44px;
  }
  .loading-overlay__fallback-text {
    font-size: 15px;
    letter-spacing: 0.26em;
  }
}

@media (prefers-reduced-motion: reduce) {
  .loading-overlay__img img {
    animation: none !important;
  }
}

/* ===================================
 * Scroll Progress Bar
 * =================================== */
.scroll-progress {
  position: fixed;
  top: 0;
  left: 0;
  height: 3px;
  background: var(--md-sys-color-primary);
  z-index: 9999;
  transition: width 100ms linear;
  pointer-events: none;
}

/* ===================================
 * View Transition (dark mode animation)
 * =================================== */
::view-transition-old(root),
::view-transition-new(root) {
  animation: none;
  mix-blend-mode: normal;
}

::view-transition-old(root) {
  z-index: 1;
}

::view-transition-new(root) {
  z-index: 9999;
}

/* For browsers without View Transition API, just use normal transition */
@media (prefers-reduced-motion: reduce) {
  ::view-transition-old(root),
  ::view-transition-new(root) {
    animation-duration: 0.01ms !important;
  }
}