/* modern-css-reset */
*,
*::before,
*::after {
  box-sizing: border-box;
}
body,
h1,
h2,
h3,
h4,
p,
figure,
blockquote,
dl,
dd {
  margin: 0;
}
ul[role="list"],
ol[role="list"] {
  list-style: none;
}
html:focus-within {
  scroll-behavior: smooth;
}
body {
  min-height: 100vh;
  text-rendering: optimizeSpeed;
  line-height: 1.5;
}
/* Dark Mode Styles */
body.dark-mode {
  --color-primary: #66b0ff;
  --color-text: #e0e0e0;
  --color-heading: #ffffff;
  --color-background: #121212;
  --color-surface: #1e1e1e;
  --color-border: #333333;

  /* 針對 PrismJS 程式碼區塊的微調 (如果有的話) */
  --code-bg: #2d2d2d;
  --code-text: #e0e0e0;
}

/* 讓圖片在深色模式下稍微變暗，避免太刺眼 */
body.dark-mode img {
  filter: brightness(0.8);
  transition: filter 0.3s ease;
}

body.dark-mode img:hover {
  filter: brightness(1);
}

/* 切換按鈕樣式 (建議放在 header) */
.theme-toggle {
  background: none;
  border: none;
  cursor: pointer;
  color: var(--color-text);
  padding: 0.5rem;
  display: flex;
  align-items: center;
  justify-content: center;
  transition: color 0.3s ease;
}

.theme-toggle:hover {
  color: var(--color-primary);
}

a:not([class]) {
  text-decoration-skip-ink: auto;
}
img,
picture {
  max-width: 100%;
  display: block;
}
input,
button,
textarea,
select {
  font: inherit;
}
@media (prefers-reduced-motion: reduce) {
  html:focus-within {
    scroll-behavior: auto;
  }
  *,
  *::before,
  *::after {
    animation-duration: 0.01ms !important;
    animation-iteration-count: 1 !important;
    transition-duration: 0.01ms !important;
    scroll-behavior: auto !important;
  }
}

:root {
  /* Colors */
  --color-primary: #007bff;
  --color-text: #333;
  --color-text-light: #757575;
  --color-heading: #1a1a1a;
  --color-background: #f8f9fa;
  --color-surface: #ffffff;
  --color-border: #dee2e6;
  --color-link: var(--color-primary);
  --color-link-hover: #0056b3;
  /* Typography */
  --font-family-base: "Lora", serif;
  --font-family-heading: "Montserrat", sans-serif;
  --font-family-code:
    "SFMono-Regular", Menlo, Monaco, Consolas, "Liberation Mono", "Courier New",
    monospace;
  /* Spacing & Layout */
  --spacing-unit: 1rem;
  --spacing-xs: calc(var(--spacing-unit) * 0.25);
  --spacing-sm: calc(var(--spacing-unit) * 0.5);
  --spacing-md: var(--spacing-unit);
  --spacing-lg: calc(var(--spacing-unit) * 1.5);
  --spacing-xl: calc(var(--spacing-unit) * 2);
  --container-width: 1140px;
  --border-radius: 0.25rem;
  --shadow: 0 2px 4px rgba(0, 0, 0, 0.05);
}

body {
  font-family: var(--font-family-base);
  color: var(--color-text);
  background-color: var(--color-background);
  padding-top: 75px; /* Platzhalter für die feste Kopfzeile */
}

.container {
  max-width: var(--container-width);
  margin: 0 auto;
  padding: var(--spacing-lg);
}

/* 頁首區域 */
.site-header {
  position: fixed;
  top: 0;
  left: 0;
  width: 100%;
  background-color: var(--color-surface);
  border-bottom: solid 1px var(--color-border);
  box-shadow: var(--shadow);
  z-index: 1000;
}

.header-container {
  display: flex;
  justify-content: space-between;
  align-items: center;
  max-width: var(--container-width);
  margin: 0 auto;
  padding: var(--spacing-md) var(--spacing-lg);
  position: relative;
}

.site-brand a,
.site-brand h1 a {
  font-family: var(--font-family-heading);
  font-weight: 700;
  font-size: 1.5em;
  color: var(--color-heading);
  text-decoration: none;
}

.site-brand h1 {
  font-size: 1em; /* The anchor already sets the size */
  margin: 0;
}

.main-nav ul {
  list-style: none;
  margin: 0;
  padding: 0;
}

.main-nav li {
  display: inline-block;
  margin-left: var(--spacing-lg);
}

.main-nav a {
  text-decoration: none;
  color: var(--color-text);
  font-family: var(--font-family-heading);
  padding: var(--spacing-xs) 0;
  border-bottom: 2px solid transparent;
  transition: border-color 0.2s ease-in-out;
}

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

/* Navigation Toggle (Hamburger) */
.nav-toggle {
  display: none; /* Hidden by default, shown in media query */
  background: transparent;
  border: none;
  cursor: pointer;
  padding: 10px;
  z-index: 1002;
  position: absolute;
  top: 50%;
  right: var(--spacing-lg);
  transform: translateY(-50%);
}

.nav-toggle-icon,
.nav-toggle-icon::before,
.nav-toggle-icon::after {
  content: "";
  display: block;
  width: 25px;
  height: 2px;
  background-color: var(--color-heading);
  position: relative;
  transition:
    transform 0.3s ease,
    background-color 0.3s ease;
}

.nav-toggle-icon::before {
  top: -8px;
}

.nav-toggle-icon::after {
  top: 6px;
}

.nav-open .nav-toggle-icon {
  background-color: transparent; /* Middle bar disappears */
}

.nav-open .nav-toggle-icon::before {
  transform: translateY(8px) rotate(45deg);
}

.nav-open .nav-toggle-icon::after {
  transform: translateY(-6px) rotate(-45deg);
}

/* 頁尾區域 */
.site-footer {
  background-color: var(--color-surface);
  border-top: solid 1px var(--color-border);
  box-shadow: 0px -2px 10px rgba(0, 0, 0, 0.05);
  margin-top: var(--spacing-xl);
  padding: var(--spacing-lg) 0;
  text-align: center;
  color: var(--color-text-light);
  font-size: 0.9em;
}

.footer-container {
  max-width: var(--container-width);
  margin: 0 auto;
  padding: 0 var(--spacing-lg);
}

.site-footer p {
  margin: var(--spacing-xs) 0;
}

.site-footer a {
  color: var(--color-link);
  text-decoration: none;
}

.site-footer a:hover {
  text-decoration: underline;
  color: var(--color-link-hover);
}

/* 首頁 文章列表 */
.article-list-item {
  background-color: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: var(--border-radius);
  margin-bottom: var(--spacing-lg);
  padding: var(--spacing-lg);
  overflow: hidden;
  box-shadow: var(--shadow);
  transition: box-shadow 0.2s ease-in-out;
}

.article-list-item:hover {
  box-shadow: 0 4px 12px rgba(0, 0, 0, 0.1);
}

.article-list-item h2 {
  margin: 0 0 var(--spacing-sm) 0;
  padding: 0;
  font-family: var(--font-family-heading);
  font-size: 1.5em;
  line-height: 1.3;
}

.article-list-item h2 a,
.article-list-item h2 a:visited {
  color: var(--color-heading);
  text-decoration: none;
}

.article-list-item h2 a:hover {
  color: var(--color-link-hover);
}

.article-meta {
  display: flex;
  align-items: center;
  flex-wrap: wrap;
  margin-bottom: var(--spacing-md);
  color: var(--color-text-light);
  font-size: 0.9em;
}

.create-date {
  display: inline-flex;
  align-items: center;
  font-family: var(--font-family-code);
  margin-right: var(--spacing-md);
  background-color: var(--color-background);
  padding: var(--spacing-xs) var(--spacing-sm);
  border-radius: var(--border-radius);
}

.create-date .meta-icon {
  margin-right: var(--spacing-xs);
}

.meta-group {
  display: inline-flex;
  flex-wrap: wrap;
  align-items: center;
  margin-right: var(--spacing-md);
}

.article-meta a {
  display: inline-block;
  color: var(--color-text-light);
  background-color: var(--color-background);
  padding: var(--spacing-xs) var(--spacing-sm);
  border-radius: var(--border-radius);
  text-decoration: none;
  transition:
    background-color 0.2s,
    color 0.2s;
  margin-right: var(--spacing-sm);
}

.article-meta .category-group {
  background-color: var(--color-background);
  border-radius: var(--border-radius);
  padding: var(--spacing-xs) var(--spacing-sm);
}

.article-meta .category-group .category-link {
  background-color: transparent;
  padding: 0;
  margin-right: 0;
}

.article-meta .category-group .category-link:hover {
  background-color: transparent;
  color: var(--color-primary);
  text-decoration: underline;
}

.category-separator {
  margin: 0 2px;
  color: var(--color-text-light);
}
.article-meta a:hover {
  color: var(--color-surface);
  background-color: var(--color-primary);
}

.article-excerpt {
  margin-bottom: var(--spacing-md);
  line-height: 1.8;
}

.article-excerpt p {
  margin-bottom: var(--spacing-md);
}

/* 修正：在文章列表中，摘要裡的標題 (H2) 應該比卡片標題小，避免混淆 */
.article-list-item .article-excerpt h2,
.article-list-item .article-excerpt h3 {
  font-size: 1.15em;
  margin-top: var(--spacing-sm);
  margin-bottom: var(--spacing-xs);
  font-weight: 600;
}

.read-more-link {
  font-family: var(--font-family-heading);
  font-weight: 600;
  color: var(--color-primary);
  text-decoration: none;
}

.read-more-link:hover {
  color: var(--color-link-hover);
  text-decoration: underline;
}

/* --- Post Content --- */
.post-content {
  background-color: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: var(--border-radius);
  padding: var(--spacing-xl);
  box-shadow: var(--shadow);
}

.post-header {
  margin-bottom: var(--spacing-xl);
  text-align: center;
}

.post-title {
  font-family: var(--font-family-heading);
  font-size: 2.5em;
  font-weight: 700;
  margin-bottom: var(--spacing-md);
  color: var(--color-heading);
}

.post-body {
  line-height: 1.8;
  font-size: 1.1em;
}

.post-body h2,
.post-body h3,
.post-body h4,
.post-body h5,
.post-body h6 {
  font-family: var(--font-family-heading);
  color: var(--color-heading);
  margin-top: var(--spacing-xl);
  margin-bottom: var(--spacing-md);
  font-weight: 600;
}

.post-body h2 {
  font-size: 1.8em;
  border-bottom: 1px solid var(--color-border);
  padding-bottom: var(--spacing-sm);
}

.post-body h3 {
  font-size: 1.5em;
}

.post-body h4 {
  font-size: 1.2em;
}

.post-body p {
  margin-bottom: var(--spacing-md);
}

.post-body a {
  color: var(--color-link);
  text-decoration: none;
  border-bottom: 1px solid var(--color-primary);
}

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

.post-body blockquote {
  border-left: 4px solid var(--color-primary);
  padding-left: var(--spacing-lg);
  margin: var(--spacing-lg) 0;
  color: var(--color-text-light);
  font-style: italic;
}

.post-body ul,
.post-body ol {
  padding-left: var(--spacing-lg);
  margin-bottom: var(--spacing-md);
}

.post-body li {
  margin-bottom: var(--spacing-sm);
}

.post-body img {
  max-width: 100%;
  height: auto;
  display: block;
  margin: var(--spacing-lg) auto;
  border-radius: var(--border-radius);
  box-shadow: var(--shadow);
}

/* --- Syntax Highlighting (Prism.js - One Light) --- */
code[class*="language-"],
pre[class*="language-"] {
  color: var(--code-text, #383a42);
  background: none;
  font-family: var(--font-family-code);
  font-size: 1em;
  text-align: left;
  white-space: pre;
  word-spacing: normal;
  word-break: normal;
  word-wrap: normal;
  line-height: 1.5;
  tab-size: 4;
  hyphens: none;
}

/* Code blocks */
pre[class*="language-"] {
  padding: 1em;
  margin: 0; /* Margin handled by container */
  overflow: auto;
  border-radius: var(--border-radius);
  border: 1px solid var(--color-border);
  background-color: var(--code-bg, #fafafa);
  box-shadow: var(--shadow);
}

/* --- Line Numbers (PrismJS Native) --- */
pre[class*="language-"].line-numbers {
  position: relative;
  padding-left: 3.8em; /* Space for line numbers */
  counter-reset: linenumber;
}

pre[class*="language-"].line-numbers > code {
  position: relative;
  white-space: inherit;
}

.line-numbers-rows {
  position: absolute;
  pointer-events: none;
  top: 0;
  font-size: 100%;
  left: -3.8em;
  width: 3em; /* Width of number column */
  letter-spacing: -1px;
  border-right: 1px solid var(--color-border);
  -webkit-user-select: none;
  -moz-user-select: none;
  -ms-user-select: none;
  user-select: none;
}

.line-numbers-rows > span {
  display: block;
  counter-increment: linenumber;
}

.line-numbers-rows > span:before {
  content: counter(linenumber);
  color: var(--color-text-light);
  display: block;
  padding-right: 0.8em;
  text-align: right;
}

/* --- Copy Button & Container --- */
.code-container {
  position: relative;
  margin: var(--spacing-lg) 0;
}

.code-container:hover .copy-btn {
  opacity: 1;
}

.copy-btn {
  position: absolute;
  top: 0.5em;
  right: 0.5em;
  padding: 0.2em 0.5em;
  background-color: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: var(--border-radius);
  cursor: pointer;
  font-family: var(--font-family-heading);
  font-size: 0.8em;
  color: var(--color-text-light);
  opacity: 0; /* Hidden by default */
  transition:
    opacity 0.2s,
    background-color 0.2s;
  z-index: 10;
}

.copy-btn:hover {
  background-color: var(--color-background);
  color: var(--color-primary);
}

/* Inline code */
:not(pre) > code[class*="language-"] {
  background: var(--code-bg, #fafafa);
  padding: 0.1em 0.3em;
  border-radius: 0.3em;
  white-space: normal;
}

.token.comment,
.token.prolog,
.token.doctype,
.token.cdata {
  color: #a0a1a7;
  font-style: italic;
}

.token.punctuation {
  color: #383a42;
}

.token.namespace {
  opacity: 0.7;
}

.token.property,
.token.tag,
.token.boolean,
.token.number,
.token.constant,
.token.symbol,
.token.deleted {
  color: #986801;
}

.token.selector,
.token.attr-name,
.token.string,
.token.char,
.token.builtin,
.token.inserted {
  color: #50a14f;
}

.token.operator,
.token.entity,
.token.url,
.language-css .token.string,
.style .token.string {
  color: #0184bb;
}

.token.atrule,
.token.attr-value,
.token.keyword {
  color: #a626a4;
}

.token.function,
.token.class-name {
  color: #4078f2;
}

.token.regex,
.token.important,
.token.variable {
  color: #e45649;
}

.token.important,
.token.bold {
  font-weight: bold;
}

.token.italic {
  font-style: italic;
}

.token.entity {
  cursor: help;
}

/* --- Archive & List Pages --- */
.page-title {
  font-family: var(--font-family-heading);
  font-size: 2em;
  font-weight: 700;
  margin-bottom: var(--spacing-lg);
  color: var(--color-heading);
  border-bottom: 2px solid var(--color-primary);
  padding-bottom: var(--spacing-sm);
}

/* --- Responsive Design --- */
/* Mobile Styles */
@media (max-width: 768px) {
  .container {
    padding-left: var(--spacing-md);
    padding-right: var(--spacing-md);
  }

  .header-container {
    padding-left: var(--spacing-md);
    padding-right: var(--spacing-md);
  }

  .nav-toggle {
    display: block; /* Show hamburger */
  }

  .nav-container {
    position: fixed;
    top: 0;
    left: 0;
    width: 300px;
    height: 100%;
    background-color: var(--color-surface);
    box-shadow: 2px 0 5px rgba(0, 0, 0, 0.1);
    border-right: 1px solid var(--color-border);
    transform: translateX(-100%);
    transition: transform 0.3s ease-in-out;
    z-index: 1001;
    padding-top: 60px; /* Space for header */
    display: flex;
    flex-direction: column;
    align-items: center;
  }

  .nav-container.is-open {
    transform: translateX(0);
  }

  .main-nav {
    padding: var(--spacing-lg);
  }

  .main-nav ul {
    display: flex;
    flex-direction: column;
  }

  .main-nav li {
    display: block;
    margin-left: 0;
    margin-bottom: var(--spacing-md);
  }

  .main-nav a {
    display: block;
    padding: var(--spacing-sm);
    border-bottom: none;
    border-radius: var(--border-radius);
  }
  .main-nav a:hover {
    background-color: var(--color-background);
    border-bottom-color: transparent;
  }

  .post-title {
    font-size: 2em;
  }

  .theme-toggle {
    margin-top: var(--spacing-md);
    width: 100%;
  }
}

/* Tablet Styles */
@media (min-width: 769px) and (max-width: 1024px) {
  :root {
    --container-width: 940px;
  }

  .post-title {
    font-size: 2.2em;
  }
}

/* Desktop Styles (undo mobile) */
@media (min-width: 769px) {
  .nav-container {
    /* Reset mobile styles */
    display: flex;
    align-items: center;
  }
  .main-nav ul {
    display: flex;
    flex-direction: row;
  }
  .main-nav li {
    margin-left: var(--spacing-lg);
    margin-bottom: 0;
  }
  .main-nav a {
    padding: var(--spacing-xs) 0;
    border-bottom: 2px solid transparent;
  }
  .main-nav a:hover {
    color: var(--color-link-hover);
    border-bottom-color: var(--color-link-hover);
    background-color: transparent;
  }

  .theme-toggle {
    margin-left: var(--spacing-md);
  }
}

/* --- About Page Skills (Tech Stack) --- */
.skill-section {
  margin-top: var(--spacing-xl);
  border-top: 1px solid var(--color-border);
  padding-top: var(--spacing-lg);
}

.skill-grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: var(--spacing-lg);
}

@media (min-width: 769px) {
  .skill-grid {
    grid-template-columns: repeat(2, 1fr);
  }
}

.skill-category h3 {
  font-size: 1.2em;
  margin-bottom: var(--spacing-sm);
  color: var(--color-heading);
  font-weight: 600;
}

.skill-tags {
  display: flex;
  flex-wrap: wrap;
  gap: 0.5rem;
}

.skill-tag {
  background-color: var(--color-background);
  border: 1px solid var(--color-border);
  padding: 0.25rem 0.75rem;
  border-radius: 2rem; /* Pill shape */
  font-size: 0.9em;
  color: var(--color-text);
  transition: all 0.2s ease;
  cursor: default;
}

.skill-tag:hover {
  border-color: var(--color-primary);
  color: var(--color-primary);
  transform: translateY(-2px);
  box-shadow: var(--shadow);
}

/* --- Pagination --- */
.pagination {
  display: flex;
  justify-content: center;
  align-items: center;
  margin-top: var(--spacing-xl);
  margin-bottom: var(--spacing-lg);
  font-family: var(--font-family-code); /* 使用等寬字體增加科技感 */
}

.pagination .page-number,
.pagination .extend {
  display: inline-flex;
  justify-content: center;
  align-items: center;
  width: 40px;
  height: 40px;
  margin: 0 4px;
  border: 1px solid var(--color-border);
  color: var(--color-text-light);
  text-decoration: none;
  font-size: 0.9rem;
  transition: all 0.3s ease;
  background-color: transparent;
  border-radius: var(--border-radius);
}

.pagination a:hover {
  border-color: var(--color-heading);
  color: var(--color-heading);
  background-color: var(--color-background);
}

.pagination .page-number.current {
  background-color: var(--color-heading);
  color: var(--color-surface);
  border-color: var(--color-heading);
  cursor: default;
}

.pagination .extend {
  font-weight: bold; /* 保持箭頭粗體 */
}

.pagination .extend:hover {
  background-color: transparent;
  border-color: var(--color-heading);
  color: var(--color-heading);
  text-decoration: none;
}

/* --- Pagination Placeholder (Reserve space for missing buttons) --- */
/* 當缺少上一頁按鈕時，在開頭補上透明佔位符，確保頁碼置中 */
.pagination:has(.page-number):not(:has(.extend.prev))::before {
  content: "";
  width: 40px;
  height: 40px;
  margin: 0 4px;
  display: inline-block;
  flex-shrink: 0;
}

/* 當缺少下一頁按鈕時，在結尾補上透明佔位符 */
.pagination:has(.page-number):not(:has(.extend.next))::after {
  content: "";
  width: 40px;
  height: 40px;
  margin: 0 4px;
  display: inline-block;
  flex-shrink: 0;
}