/* ====== Global layout ====== */
* {
  box-sizing: border-box;
}

:root {
  --page-max-width: 1320px;
  --page-pad-top: 16px;
  --page-pad-x: 40px;
  --page-pad-bottom: 40px;
  --page-gap: 20px;
}

html,
body {
  margin: 0;
  padding: 0;
  height: 100%;
  overflow: hidden;
}

body {
  font-family: Arial, sans-serif;
  line-height: 1.6;
  background: var(--bg-main);
  color: var(--text-main);
}

.layout {
  display: grid;
  grid-template-columns: 220px 1fr;
  grid-template-rows: auto 1fr;
  grid-template-areas:
    "header header"
    "nav content";
  height: 100vh;
  overflow: hidden;
}

/* Header：只作用于站点顶部主头部 */
.layout > header {
  grid-area: header;
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 16px 24px;
  background: linear-gradient(90deg, #ffffff 0%, #f7f9fd 100%);
  border-bottom: 1px solid var(--border-soft);
  z-index: 50;
  min-width: 0;
}

.logo {
  display: flex;
  align-items: center;
  gap: 12px;
  text-decoration: none;
  min-width: 0;
}

.logo img {
  width: 52px;
  height: 52px;
  border-radius: 50%;
  object-fit: cover;
  border: 2px solid var(--primary);
  box-shadow: 0 0 14px var(--glow);
  flex-shrink: 0;
}

.logo span {
  font-size: 28px;
  font-weight: 700;
  color: var(--primary-dark);
  min-width: 0;
}

/* Nav */
nav {
  grid-area: nav;
  background: var(--bg-panel);
  border-right: 1px solid var(--border-soft);
  padding: 22px 12px;
  display: flex;
  flex-direction: column;
  gap: 8px;
  overflow: hidden;
}

nav a {
  text-decoration: none;
  color: var(--text-main);
  padding: 12px 14px;
  border-radius: 12px;
  font-size: 18px;
  transition: background 0.2s ease, color 0.2s ease, transform 0.2s ease;
  display: block;
}

nav a:hover {
  background: var(--primary-soft);
  color: var(--primary-dark);
  transform: translateX(4px);
}

nav a.active {
  background: var(--primary);
  color: #fff;
  font-weight: 700;
  transform: translateX(4px);
}

/* 右侧滚动容器：只有这里滚动 */
.content-scroll {
  grid-area: content;
  display: flex;
  flex-direction: column;
  min-width: 0;
  min-height: 0;
  overflow-y: auto;
  overflow-x: hidden;
  background: var(--bg-main);
}

/* Main：统一版心和留白 */
main {
  flex: 1 0 auto;
  width: 100%;
  max-width: var(--page-max-width);
  margin: 0 auto;
  padding: var(--page-pad-top) var(--page-pad-x) var(--page-pad-bottom);
  display: flex;
  flex-direction: column;
  gap: var(--page-gap);
  background: var(--bg-main);
  min-width: 0;
}

/* ===== 通用页面容器 ===== */
.page-container {
  width: 100%;
  margin: 0;
  padding: 0;
  background: transparent !important;
  border: none !important;
  box-shadow: none !important;
}

/* 不套默认卡片的 section 容器 */
.no-card {
  width: 100%;
  margin: 0;
  padding: 0 !important;
  background: transparent !important;
  border: none !important;
  box-shadow: none !important;
}

/* ===== 通用标题系统（统一版）===== */
.page-title {
  margin: 0 0 6px;
  font-size: 28px;
  line-height: 1.2;
  font-weight: 700;
  color: var(--primary-dark);
}

.page-desc {
  margin: 0;
  font-size: 14px;
  line-height: 1.8;
  color: var(--text-muted);
}

/* 所有页面标题统一为纵向结构 */
.notes-hero,
.about-hero,
.update-hero,
.comment-hero,
.gallery-hero,
.anime-hero,
.home-hero {
  display: flex;
  flex-direction: column;
  align-items: flex-start;
  gap: 4px;
  margin-bottom: 20px;
  padding: 0 !important;
  background: transparent !important;
  border: none !important;
  box-shadow: none !important;
}

/* ===== 通用卡片系统 ===== */
.card {
  background: var(--bg-card);
  border: 1px solid var(--border-soft);
  border-radius: 18px;
  padding: 24px;
  box-shadow: var(--shadow-soft);
  transition: transform 0.2s ease, box-shadow 0.2s ease;
}

.card:hover {
  transform: translateY(-2px);
  box-shadow: 0 12px 28px rgba(15, 23, 42, 0.12);
}

/* 默认 section 卡片规则 */
section:not(.no-card):not(.notes-hero):not(.about-hero):not(.update-hero):not(.comment-hero):not(.gallery-hero):not(.anime-hero):not(.home-hero) {
  background: var(--bg-card);
  border: 1px solid var(--border-soft);
  border-radius: 18px;
  padding: 24px;
  box-shadow: var(--shadow-soft);
}

h1,
h2,
h3,
p,
ul {
  margin-top: 0;
}

h2 {
  color: var(--primary-dark);
}

p {
  color: var(--text-main);
}

/* Footer 跟 main 一起放进右侧滚动区 */
footer {
  flex-shrink: 0;
  background: #f8fafc;
  border-top: 1px solid var(--border-soft);
  padding: 18px;
  text-align: center;
  color: var(--text-muted);
}

/* ========== Tablet / Mobile ========== */
@media (max-width: 900px) {
  :root {
    --page-pad-top: 16px;
    --page-pad-x: 18px;
    --page-pad-bottom: 32px;
    --page-gap: 18px;
  }

  html,
  body {
    height: 100%;
    overflow: hidden;
  }

  .layout {
    grid-template-columns: 1fr;
    grid-template-rows: auto auto 1fr;
    grid-template-areas:
      "header"
      "nav"
      "content";
    height: 100vh;
    overflow: hidden;
  }

  .layout > header {
    padding: 14px 16px;
  }

  .logo img {
    width: 48px;
    height: 48px;
  }

  .logo span {
    font-size: 22px;
  }

  nav {
    flex-direction: row;
    flex-wrap: nowrap;
    align-items: center;
    gap: 12px;
    padding: 12px 16px;
    border-right: none;
    border-bottom: 1px solid var(--border-soft);
    overflow-x: auto;
    overflow-y: hidden;
    white-space: nowrap;
    -webkit-overflow-scrolling: touch;
  }

  nav::-webkit-scrollbar {
    display: none;
  }

  nav a {
    flex: 0 0 auto;
    white-space: nowrap;
    font-size: 16px;
    padding: 10px 16px;
  }

  nav a:hover,
  nav a.active {
    transform: none;
  }

  .content-scroll {
    min-height: 0;
    overflow-y: auto;
    overflow-x: hidden;
  }

  main {
    max-width: 100%;
  }

  .card,
  section:not(.no-card):not(.notes-hero):not(.about-hero):not(.update-hero):not(.comment-hero):not(.gallery-hero):not(.anime-hero):not(.home-hero) {
    padding: 20px;
    border-radius: 16px;
  }

  .page-title {
    font-size: 26px;
  }
}

/* ========== Small phones ========== */
@media (max-width: 480px) {
  :root {
    --page-pad-top: 14px;
    --page-pad-x: 14px;
    --page-pad-bottom: 28px;
    --page-gap: 16px;
  }

  .layout > header {
    padding: 12px 14px;
  }

  .logo {
    gap: 10px;
  }

  .logo img {
    width: 44px;
    height: 44px;
  }

  .logo span {
    font-size: 18px;
  }

  nav {
    gap: 10px;
    padding: 10px 12px;
  }

  nav a {
    font-size: 15px;
    padding: 10px 14px;
    border-radius: 10px;
  }

  .card,
  section:not(.no-card):not(.notes-hero):not(.about-hero):not(.update-hero):not(.comment-hero):not(.gallery-hero):not(.anime-hero):not(.home-hero) {
    padding: 18px;
    border-radius: 14px;
  }

  .page-title {
    font-size: 24px;
  }

  .page-desc {
    font-size: 13px;
  }
}

/* 返回顶部按钮 */
#back-to-top {
  position: fixed;
  bottom: 80px;
  right: 24px;
  width: 44px;
  height: 44px;
  border: none;
  border-radius: 50%;
  background: var(--primary);
  color: #fff;
  font-size: 18px;
  cursor: pointer;
  box-shadow: 0 4px 12px rgba(0, 0, 0, 0.2);
  opacity: 0;
  pointer-events: none;
  transition: all 0.3s ease;
  z-index: 999;
}

#back-to-top.show {
  opacity: 1;
  pointer-events: auto;
}

#back-to-top:hover {
  transform: translateY(-2px);
}