/* Listen 风格：大留白、无衬线、浅色/深色主题、响应式（无第三方框架） */

:root {
  --bg: #fafafa;
  --bg-elevated: #ffffff;
  --text: #111111;
  --text-muted: #6b7280;
  --border: #e5e7eb;
  --shadow: 0 1px 3px rgba(0, 0, 0, 0.06);
  --shadow-card: 0 8px 30px rgba(0, 0, 0, 0.06);
  --radius: 16px;
  --radius-sm: 12px;
  --radius-avatar: 28px;
  --font: system-ui, -apple-system, "Segoe UI", Roboto, "PingFang SC",
    "Microsoft YaHei", "Helvetica Neue", Arial, sans-serif;
  --mono: ui-monospace, "Cascadia Code", "SF Mono", Consolas, monospace;
  --transition: 0.2s ease;
  --primary: #111111;
  --primary-contrast: #ffffff;
}

html[data-theme="dark"] {
  --bg: #0c0c0c;
  --bg-elevated: #141414;
  --text: #f4f4f5;
  --text-muted: #a1a1aa;
  --border: #27272a;
  --shadow: 0 1px 3px rgba(0, 0, 0, 0.4);
  --shadow-card: 0 12px 40px rgba(0, 0, 0, 0.45);
  --primary: #fafafa;
  --primary-contrast: #111111;
}

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

html {
  scroll-behavior: smooth;
}

body {
  margin: 0;
  font-family: var(--font);
  font-size: 1rem;
  line-height: 1.65;
  color: var(--text);
  background: var(--bg);
  min-height: 100vh;
  display: flex;
  flex-direction: column;
}

a {
  color: inherit;
  text-decoration: none;
  transition: opacity var(--transition), color var(--transition);
}

.site-nav a:hover,
.footer-nav a:hover,
.section-more:hover,
.logo:hover {
  opacity: 0.75;
}

img {
  max-width: 100%;
  height: auto;
}

.skip-link {
  position: absolute;
  left: -999px;
  top: 0;
  background: var(--primary);
  color: var(--primary-contrast);
  padding: 0.5rem 1rem;
  z-index: 1000;
}

.skip-link:focus {
  left: 0.5rem;
  top: 0.5rem;
}

.container {
  width: min(1120px, 100% - 2rem);
  margin-inline: auto;
}

.narrow {
  max-width: 720px;
}

/* —— 顶栏 —— */
/* 移动端不用 backdrop-filter，否则子元素 position:fixed 会相对顶栏裁剪，抽屉无法全屏 */
.site-header {
  position: sticky;
  top: 0;
  z-index: 50;
  background: color-mix(in srgb, var(--bg) 92%, transparent);
  border-bottom: 1px solid var(--border);
}

@media (min-width: 769px) {
  .site-header {
    background: color-mix(in srgb, var(--bg) 88%, transparent);
    backdrop-filter: blur(12px);
  }
}

@supports not (background: color-mix(in srgb, white 50%, transparent)) {
  .site-header {
    background: var(--bg-elevated);
  }
}

/* 移动端菜单遮罩（抽屉打开时） */
.nav-backdrop {
  display: none;
}

@media (max-width: 768px) {
  .nav-backdrop {
    display: block;
    position: fixed;
    inset: 0;
    z-index: 40;
    background: color-mix(in srgb, var(--text) 42%, transparent);
    opacity: 0;
    visibility: hidden;
    pointer-events: none;
    transition: opacity 0.28s ease, visibility 0.28s ease;
  }

  html.nav-drawer-open .nav-backdrop {
    opacity: 1;
    visibility: visible;
    pointer-events: auto;
  }

  html.nav-drawer-open {
    overflow: hidden;
  }
}

.header-inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 1rem;
  min-height: 64px;
  flex-wrap: wrap;
}

.header-left {
  display: flex;
  align-items: center;
  gap: clamp(1rem, 3vw, 2rem);
  flex: 1;
  min-width: 0;
}

.header-right {
  display: flex;
  align-items: center;
  gap: 0.6rem;
}

.logo {
  font-weight: 700;
  font-size: 1.125rem;
  color: var(--text);
  letter-spacing: -0.03em;
  white-space: nowrap;
}

.site-nav {
  display: flex;
  align-items: center;
  gap: 1.35rem;
}

.site-nav a {
  font-size: 0.9375rem;
  font-weight: 500;
  color: var(--text-muted);
}

.nav-search input {
  width: min(200px, 28vw);
  padding: 0.5rem 0.85rem;
  border: 1px solid var(--border);
  border-radius: 999px;
  background: var(--bg-elevated);
  color: var(--text);
  font: inherit;
  transition: border-color var(--transition), box-shadow var(--transition);
}

.nav-search input::placeholder {
  color: var(--text-muted);
}

.nav-search input:focus {
  outline: none;
  border-color: var(--text-muted);
  box-shadow: 0 0 0 3px color-mix(in srgb, var(--text-muted) 22%, transparent);
}

.theme-toggle {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 40px;
  height: 40px;
  padding: 0;
  border: 1px solid var(--border);
  border-radius: 999px;
  background: var(--bg-elevated);
  color: var(--text);
  cursor: pointer;
  transition: background var(--transition), border-color var(--transition);
}

.theme-toggle:hover {
  border-color: var(--text-muted);
}

.theme-icon-sun {
  display: none;
}

html[data-theme="dark"] .theme-icon-moon {
  display: none;
}

html[data-theme="dark"] .theme-icon-sun {
  display: block;
}

.nav-toggle {
  display: none;
  flex-direction: column;
  justify-content: center;
  gap: 5px;
  width: 44px;
  height: 44px;
  padding: 0;
  border: 1px solid var(--border);
  border-radius: var(--radius-sm);
  background: var(--bg-elevated);
  cursor: pointer;
}

.nav-toggle-bar {
  display: block;
  width: 20px;
  height: 2px;
  margin-inline: auto;
  background: var(--text);
  border-radius: 1px;
}

@media (max-width: 768px) {
  .header-inner {
    gap: 0.75rem;
  }

  .header-left {
    flex-wrap: nowrap;
    width: auto;
    flex: 1;
    min-width: 0;
    justify-content: flex-start;
    align-items: center;
  }

  .nav-toggle {
    display: inline-flex;
  }

  /* 侧滑抽屉 + 半屏遮罩，避免链接堆在顶栏下方 */
  .site-nav {
    display: flex;
    position: fixed;
    top: 0;
    right: 0;
    bottom: 0;
    width: min(300px, 86vw);
    margin: 0;
    padding: 4.25rem 1.35rem 1.5rem;
    flex-direction: column;
    align-items: flex-start;
    gap: 1.1rem;
    background: var(--bg-elevated);
    border-left: 1px solid var(--border);
    box-shadow: -12px 0 40px color-mix(in srgb, var(--text) 12%, transparent);
    z-index: 50;
    transform: translateX(100%);
    visibility: hidden;
    transition: transform 0.28s ease, visibility 0.28s ease;
  }

  .site-header.nav-open .site-nav {
    transform: translateX(0);
    visibility: visible;
  }

  .nav-search input {
    width: 140px;
  }
}

@media (min-width: 769px) {
  .nav-toggle {
    display: none !important;
  }

  .site-nav {
    display: flex !important;
    position: static !important;
    width: auto !important;
    height: auto !important;
    padding: 0 !important;
    margin: 0 !important;
    flex-direction: row !important;
    align-items: center !important;
    gap: 1.35rem !important;
    background: transparent !important;
    border: none !important;
    box-shadow: none !important;
    transform: none !important;
    visibility: visible !important;
    transition: none !important;
  }
}

/* —— 主内容 —— */
.main-content {
  flex: 1;
  padding-block: 2.25rem 3.5rem;
}

/* Hero */
.hero-profile {
  padding-block: 0.5rem 2rem;
}

.hero-inner {
  display: grid;
  gap: 2.5rem;
  grid-template-columns: 1fr;
  align-items: center;
}

@media (min-width: 900px) {
  .hero-inner {
    grid-template-columns: auto 1fr;
    gap: 3.5rem;
  }
}

.hero-avatar-wrap {
  justify-self: center;
}

@media (min-width: 900px) {
  .hero-avatar-wrap {
    justify-self: start;
  }
}

.hero-avatar {
  width: min(220px, 72vw);
  height: auto;
  aspect-ratio: 1;
  object-fit: cover;
  border-radius: var(--radius-avatar);
  box-shadow: var(--shadow-card);
  border: 1px solid var(--border);
  display: block;
}

.hero-overline {
  margin: 0 0 0.5rem;
  font-size: 0.72rem;
  font-weight: 600;
  letter-spacing: 0.2em;
  text-transform: uppercase;
  color: var(--text-muted);
}

.hero-title {
  font-size: clamp(2.25rem, 5vw, 3rem);
  margin: 0 0 0.85rem;
  letter-spacing: -0.04em;
  line-height: 1.1;
  font-weight: 700;
}

.hero-tagline {
  margin: 0 0 1.35rem;
  color: var(--text-muted);
  font-size: 1.05rem;
  max-width: 36rem;
}

.hero-social {
  display: flex;
  align-items: center;
  gap: 0.85rem;
  margin-bottom: 1.35rem;
}

.social-icon {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 40px;
  height: 40px;
  border-radius: 999px;
  border: 1px solid var(--border);
  color: var(--text-muted);
  background: var(--bg-elevated);
  font-size: 0.85rem;
  font-weight: 700;
  transition: color var(--transition), border-color var(--transition), background var(--transition);
}

.social-icon:hover {
  color: var(--text);
  border-color: var(--text-muted);
}

.social-icon-zhihu {
  font-family: var(--font);
}

.hero-actions {
  display: flex;
  flex-wrap: wrap;
  gap: 0.85rem;
}

.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  padding: 0.62rem 1.35rem;
  border-radius: 999px;
  font-weight: 600;
  font-size: 0.9375rem;
  border: 1px solid transparent;
  cursor: pointer;
  transition: background var(--transition), color var(--transition),
    border-color var(--transition), transform 0.12s ease, opacity var(--transition);
}

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

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

.btn-primary:hover {
  opacity: 0.92;
  color: var(--primary-contrast);
}

.btn-arrow::after {
  content: " →";
  font-weight: 500;
}

.btn-ghost {
  background: transparent;
  border-color: var(--border);
  color: var(--text);
}

.btn-ghost:hover {
  border-color: var(--text-muted);
  background: color-mix(in srgb, var(--bg-elevated) 80%, var(--text) 3%);
}

/* 区块 */
.section {
  padding-block: 2rem;
}

.section-muted {
  background: color-mix(in srgb, var(--bg-elevated) 92%, var(--text) 2%);
  border-block: 1px solid var(--border);
}

.section-head {
  display: flex;
  align-items: baseline;
  justify-content: space-between;
  gap: 1rem;
  margin-bottom: 1.75rem;
}

.section-title {
  margin: 0;
  font-size: clamp(1.5rem, 3vw, 1.85rem);
  font-weight: 700;
  letter-spacing: -0.03em;
}

.section-more {
  font-size: 0.92rem;
  font-weight: 600;
  color: var(--text-muted);
  white-space: nowrap;
}

.chip-row {
  display: flex;
  flex-wrap: wrap;
  gap: 0.5rem;
}

.chip {
  padding: 0.4rem 0.95rem;
  background: var(--bg-elevated);
  border: 1px solid var(--border);
  border-radius: 999px;
  font-size: 0.88rem;
  color: var(--text);
  transition: border-color var(--transition), background var(--transition);
}

.chip:hover {
  border-color: var(--text-muted);
}

.chip-lg {
  padding: 0.55rem 1.15rem;
  font-size: 0.95rem;
}

.tag-wall {
  gap: 0.65rem;
}

/* 卡片 */
.card-grid {
  display: grid;
  gap: 1.5rem;
  grid-template-columns: 1fr;
}

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

@media (min-width: 1000px) {
  .card-grid {
    grid-template-columns: repeat(3, 1fr);
  }
}

.card {
  background: var(--bg-elevated);
  border-radius: var(--radius);
  border: 1px solid var(--border);
  box-shadow: var(--shadow-card);
  overflow: hidden;
  transition: transform var(--transition), box-shadow var(--transition), border-color var(--transition);
}

.card-hover:hover {
  transform: translateY(-3px);
  border-color: color-mix(in srgb, var(--text-muted) 35%, var(--border));
}

.card-link {
  display: block;
  color: inherit;
  height: 100%;
}

.card-link:hover {
  color: inherit;
}

.card-thumb {
  position: relative;
  height: 140px;
  display: grid;
  place-items: center;
  border-bottom: 1px solid var(--border);
}

.card-thumb-letter {
  font-size: 3.25rem;
  font-weight: 700;
  letter-spacing: -0.05em;
  color: color-mix(in srgb, var(--text) 88%, transparent);
  user-select: none;
}

.card-thumb--1 {
  background: linear-gradient(145deg, #fef3c7, #fde68a);
}
.card-thumb--2 {
  background: linear-gradient(145deg, #dbeafe, #bfdbfe);
}
.card-thumb--3 {
  background: linear-gradient(145deg, #fce7f3, #fbcfe8);
}
.card-thumb--4 {
  background: linear-gradient(145deg, #d1fae5, #a7f3d0);
}
.card-thumb--5 {
  background: linear-gradient(145deg, #e9d5ff, #ddd6fe);
}
.card-thumb--6 {
  background: linear-gradient(145deg, #ffedd5, #fed7aa);
}

html[data-theme="dark"] .card-thumb-letter {
  color: color-mix(in srgb, var(--text) 75%, transparent);
}

html[data-theme="dark"] .card-thumb--1 {
  background: linear-gradient(145deg, #422006, #713f12);
}
html[data-theme="dark"] .card-thumb--2 {
  background: linear-gradient(145deg, #172554, #1e3a5f);
}
html[data-theme="dark"] .card-thumb--3 {
  background: linear-gradient(145deg, #4a044e, #701a75);
}
html[data-theme="dark"] .card-thumb--4 {
  background: linear-gradient(145deg, #052e16, #14532d);
}
html[data-theme="dark"] .card-thumb--5 {
  background: linear-gradient(145deg, #2e1065, #4c1d95);
}
html[data-theme="dark"] .card-thumb--6 {
  background: linear-gradient(145deg, #431407, #7c2d12);
}

.card-body {
  padding: 1.15rem 1.25rem 1.4rem;
}

.card-meta {
  margin: 0 0 0.55rem;
  font-size: 0.8125rem;
  color: var(--text-muted);
  display: flex;
  align-items: center;
  flex-wrap: wrap;
  gap: 0.25rem;
}

.card-meta-cal {
  display: inline-flex;
  margin-right: 0.15rem;
}

.icon-calendar {
  vertical-align: middle;
  opacity: 0.85;
}

.card-meta-sep {
  margin: 0 0.15rem;
}

.card-title {
  margin: 0 0 0.45rem;
  font-size: 1.1rem;
  font-weight: 700;
  letter-spacing: -0.02em;
  line-height: 1.35;
}

.card-excerpt {
  margin: 0;
  font-size: 0.9rem;
  color: var(--text-muted);
  line-height: 1.55;
}

.card-tags {
  margin-top: 0.85rem;
  display: flex;
  flex-wrap: wrap;
  gap: 0.35rem;
}

.tag {
  font-size: 0.72rem;
  padding: 0.2rem 0.55rem;
  border-radius: 999px;
  background: color-mix(in srgb, var(--bg) 70%, var(--text-muted) 8%);
  color: var(--text-muted);
  border: 1px solid var(--border);
}

.tag-link {
  border: 1px solid transparent;
}

.tag-link:hover {
  border-color: var(--border);
  color: var(--text);
}

/* 页面头 */
.page-head {
  margin-bottom: 1.85rem;
}

.page-title {
  margin: 0 0 0.45rem;
  font-size: clamp(1.75rem, 3vw, 2.1rem);
  letter-spacing: -0.03em;
  font-weight: 700;
}

.page-desc {
  margin: 0;
  color: var(--text-muted);
}

/* 文章详情 */
.article-layout {
  max-width: 760px;
}

.article-head {
  margin-bottom: 2rem;
}

.article-meta {
  margin: 0 0 0.75rem;
  font-size: 0.88rem;
  color: var(--text-muted);
}

.article-meta a {
  color: var(--text-muted);
  text-decoration: underline;
  text-underline-offset: 0.15em;
}

.article-meta a:hover {
  color: var(--text);
}

.article-title {
  margin: 0 0 0.75rem;
  font-size: clamp(1.75rem, 3vw, 2.25rem);
  line-height: 1.2;
  letter-spacing: -0.03em;
  font-weight: 700;
}

.article-lede {
  margin: 0 0 1rem;
  font-size: 1.06rem;
  color: var(--text-muted);
}

.article-tags {
  display: flex;
  flex-wrap: wrap;
  gap: 0.4rem;
}

.article-body {
  font-size: 1.02rem;
  color: color-mix(in srgb, var(--text) 92%, var(--text-muted));
}

.article-body h1,
.article-body h2,
.article-body h3 {
  margin-top: 1.75rem;
  margin-bottom: 0.65rem;
  line-height: 1.3;
  letter-spacing: -0.02em;
  color: var(--text);
}

.article-body p {
  margin: 0.9rem 0;
}

.article-body ul,
.article-body ol {
  padding-left: 1.25rem;
}

.article-body blockquote {
  margin: 1.25rem 0;
  padding: 0.6rem 1rem;
  border-left: 3px solid var(--text-muted);
  background: color-mix(in srgb, var(--bg-elevated) 85%, var(--text) 4%);
  color: var(--text-muted);
}

.article-body pre {
  font-family: var(--mono);
  font-size: 0.88rem;
  padding: 1rem 1.1rem;
  border-radius: var(--radius-sm);
  background: #1b2430;
  color: #e8eef7;
  overflow-x: auto;
  border: 1px solid #2c3a4d;
}

.article-body code {
  font-family: var(--mono);
  font-size: 0.9em;
  background: color-mix(in srgb, var(--bg-elevated) 70%, var(--text-muted) 12%);
  padding: 0.12rem 0.35rem;
  border-radius: 6px;
}

.article-body pre code {
  background: none;
  padding: 0;
  color: inherit;
}

.article-body img {
  display: block;
  max-width: 100%;
  height: auto;
  margin: 1.15rem auto;
  border-radius: var(--radius-sm);
  box-shadow: var(--shadow-card);
}

.article-body p img {
  margin-inline: auto;
}

.article-body video {
  display: block;
  max-width: 100%;
  height: auto;
  margin: 1.15rem auto;
  border-radius: var(--radius-sm);
  box-shadow: var(--shadow-card);
}

.article-foot {
  margin-top: 2.5rem;
  padding-top: 1.5rem;
  border-top: 1px solid var(--border);
}

/* 分页 */
.pagination {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 1rem;
  margin-top: 2rem;
}

.page-link {
  padding: 0.45rem 0.9rem;
  border-radius: 999px;
  border: 1px solid var(--border);
  background: var(--bg-elevated);
  font-size: 0.9rem;
  color: var(--text);
}

.page-link:hover:not(.disabled) {
  border-color: var(--text-muted);
}

.page-link.disabled {
  opacity: 0.45;
  pointer-events: none;
}

.page-info {
  font-size: 0.9rem;
  color: var(--text-muted);
}

/* 搜索 */
.search-form-large {
  display: flex;
  flex-wrap: wrap;
  gap: 0.6rem;
  margin-top: 0.5rem;
}

.search-form-large input {
  flex: 1;
  min-width: 200px;
  padding: 0.65rem 1rem;
  border-radius: var(--radius-sm);
  border: 1px solid var(--border);
  background: var(--bg-elevated);
  color: var(--text);
  font: inherit;
}

.search-form-large input:focus {
  outline: none;
  border-color: var(--text-muted);
}

.search-summary {
  color: var(--text-muted);
  margin-bottom: 1.25rem;
}

/* 关于 */
.lead {
  font-size: 1.08rem;
  color: var(--text-muted);
}

.about-block {
  margin-top: 2rem;
}

.about-block h2 {
  font-size: 1.15rem;
  margin-bottom: 0.5rem;
  font-weight: 700;
}

.about-list {
  margin: 0;
  padding-left: 1.25rem;
  color: var(--text-muted);
}

.about-cta {
  margin-top: 2.5rem;
  display: flex;
  flex-wrap: wrap;
  gap: 0.75rem;
}

.empty-hint {
  padding: 2rem;
  text-align: center;
  background: var(--bg-elevated);
  border: 1px dashed var(--border);
  border-radius: var(--radius);
  color: var(--text-muted);
}

.empty-hint code {
  font-family: var(--mono);
  font-size: 0.88em;
}

/* 页脚 */
.site-footer {
  margin-top: auto;
  padding: 1.5rem 0;
  border-top: 1px solid var(--border);
  background: var(--bg-elevated);
}

.footer-inner {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  justify-content: space-between;
  gap: 0.75rem;
}

.footer-copy {
  margin: 0;
  font-size: 0.82rem;
  color: var(--text-muted);
}

.footer-nav {
  display: flex;
  gap: 1.25rem;
  font-size: 0.88rem;
  color: var(--text-muted);
}