/* ===== 主题颜色与基础排版 ===== */
/* 笔记区使用独立样式文件；主页面昼夜选择会在这里继续生效。 */
:root {
  color-scheme: dark;
  --page-bg: #17232c;
  --page-text: #f5f4ef;
  --muted-text: rgba(245, 244, 239, 0.68);
  --accent: #c4f06d;
  --panel-bg: rgba(15, 20, 20, 0.64);
  --panel-text: #f0f1ec;
  --panel-muted: #a4aea7;
  --panel-border: rgba(240, 241, 236, 0.14);
  /* 与首页共用原创背景，笔记页在手机上切换为竖版构图。 */
  --background-image: url("../images/background-desktop.svg");
  --mobile-background-image: url("../images/background-mobile.svg");
  --forest-background-image: url("../images/background-forest.svg");
  --coast-background-image: url("../images/background-coast.svg");
  --aurora-background-image: url("../images/background-aurora.svg");
  --sakura-background-image: url("../images/background-sakura.svg");
  --lake-background-image: url("../images/background-lake.svg");
  --desert-background-image: url("../images/background-desert.svg");
}

body[data-theme="day"] {
  color-scheme: light;
  --page-bg: #e7ece4;
  --page-text: #142019;
  --muted-text: #26382c;
  --accent: #355d12;
  --panel-bg: rgba(255, 255, 252, 0.7);
  --panel-text: #17211f;
  --panel-muted: #4a554d;
  --panel-border: rgba(27, 38, 34, 0.18);
}

* {
  box-sizing: border-box;
}

html {
  min-width: 320px;
  min-height: 100%;
  scroll-behavior: smooth;
}

body {
  min-width: 320px;
  min-height: 100vh;
  margin: 0;
  color: var(--page-text);
  background: var(--page-bg);
  font-family: "Segoe UI", "Microsoft YaHei", "PingFang SC", sans-serif;
  transition: color 420ms ease, background-color 420ms ease;
}

a,
button {
  font: inherit;
}

a:focus-visible,
button:focus-visible {
  outline: 3px solid var(--accent);
  outline-offset: 4px;
}

.notes-site {
  /* 页面主体铺满视口，窄屏时改用下方媒体查询调整边距。 */
  position: relative;
  display: flex;
  min-height: 100vh;
  min-height: 100dvh;
  flex-direction: column;
  isolation: isolate;
  padding: 0;
}

.notes-background {
  /* 背景铺满视口且置于内容之后，不拦截鼠标或触摸操作。 */
  position: fixed;
  z-index: 0;
  inset: 0;
  overflow: hidden;
  background: linear-gradient(150deg, #25363c 0%, #14212a 55%, #263a38 100%);
  transition: background-color 420ms ease;
}

/* 笔记和首页共用七张原创风景，每张停留一分钟后再缓慢交替。 */
.notes-background .background-scene {
  position: absolute;
  inset: 0;
  background-position: center;
  background-repeat: no-repeat;
  background-size: cover;
  opacity: 0;
  pointer-events: none;
  transition: opacity 2200ms ease-in-out, filter 420ms ease;
}

.notes-background .background-scene.is-active {
  opacity: 1;
}

.notes-background .scene-mountain {
  background-image:
    linear-gradient(135deg, rgba(14, 25, 34, 0.22), rgba(31, 48, 52, 0.16)),
    var(--background-image);
}

.notes-background .scene-forest {
  background-image:
    linear-gradient(135deg, rgba(14, 25, 34, 0.2), rgba(31, 48, 52, 0.14)),
    var(--forest-background-image);
}

.notes-background .scene-coast {
  background-image:
    linear-gradient(135deg, rgba(14, 25, 34, 0.18), rgba(31, 48, 52, 0.12)),
    var(--coast-background-image);
}

.notes-background .scene-aurora {
  background-image:
    linear-gradient(135deg, rgba(14, 25, 34, 0.18), rgba(31, 48, 52, 0.12)),
    var(--aurora-background-image);
}

.notes-background .scene-sakura {
  background-image:
    linear-gradient(135deg, rgba(14, 25, 34, 0.16), rgba(31, 48, 52, 0.1)),
    var(--sakura-background-image);
}

.notes-background .scene-lake {
  background-image:
    linear-gradient(135deg, rgba(14, 25, 34, 0.18), rgba(31, 48, 52, 0.12)),
    var(--lake-background-image);
}

.notes-background .scene-desert {
  background-image:
    linear-gradient(135deg, rgba(14, 25, 34, 0.18), rgba(31, 48, 52, 0.12)),
    var(--desert-background-image);
}

body[data-theme="day"] .notes-background {
  background: linear-gradient(150deg, #dce8df 0%, #d7e2e8 55%, #e0eadf 100%);
}

body[data-theme="day"] .notes-background .background-scene {
  filter: brightness(1.14) saturate(0.9);
}

.notes-header {
  /* 顶栏固定在全屏面板上方，滚动笔记时始终可以切换主题或返回。 */
  position: fixed;
  z-index: 3;
  top: 0;
  right: 0;
  left: 0;
  display: flex;
  min-height: 82px;
  align-items: center;
  justify-content: space-between;
  padding: 18px max(24px, calc((100vw - 1060px) / 2));
  background: linear-gradient(to bottom, rgba(15, 20, 20, 0.3), transparent);
  transition: background-color 420ms ease;
}

body[data-theme="day"] .notes-header {
  background: linear-gradient(to bottom, rgba(255, 255, 252, 0.4), transparent);
}

/* ===== 笔记目录与正文面板 ===== */
.home-link,
.back-link {
  display: inline-flex;
  align-items: center;
  gap: 9px;
  color: var(--page-text);
  text-decoration: none;
  transition: color 420ms ease;
}

.home-link:hover,
.back-link:hover {
  color: var(--accent);
}

.home-link span,
.back-link span {
  font-size: 19px;
}

.theme-toggle {
  display: inline-flex;
  min-height: 40px;
  align-items: center;
  gap: 9px;
  padding: 0 14px;
  border: 1px solid rgba(255, 255, 255, 0.34);
  border-radius: 999px;
  color: var(--page-text);
  background: rgba(20, 30, 34, 0.2);
  backdrop-filter: blur(12px);
  cursor: pointer;
  transition: color 420ms ease, background-color 420ms ease, border-color 420ms ease,
    transform 180ms ease;
}

.theme-toggle:hover {
  transform: translateY(-2px);
}

body[data-theme="day"] .theme-toggle {
  border-color: rgba(20, 32, 24, 0.32);
  color: #142019;
  background: rgba(255, 255, 255, 0.82);
}

.notes-panel {
  /* 笔记底板铺满视口，与账号子页面保持相同的全屏阅读体验。 */
  position: fixed;
  z-index: 1;
  inset: 0;
  width: 100%;
  min-height: 100vh;
  min-height: 100dvh;
  margin: 0;
  overflow-y: auto;
  overscroll-behavior: contain;
  scrollbar-gutter: stable;
  padding: 112px max(24px, calc((100vw - 1060px) / 2)) 56px;
  border: 0;
  border-radius: 0;
  color: var(--panel-text);
  background: var(--panel-bg);
  box-shadow: none;
  backdrop-filter: blur(2px);
  transition: color 420ms ease, background-color 420ms ease, border-color 420ms ease,
    box-shadow 420ms ease;
}

.notes-view {
  max-width: 760px;
  margin: 0 auto;
  animation: slide-in 420ms cubic-bezier(0.22, 0.75, 0.25, 1) both;
  transition: color 420ms ease;
}

.eyebrow {
  margin: 0 0 12px;
  color: var(--accent);
  font-size: 10px;
  font-weight: 700;
  letter-spacing: 0.2em;
  transition: color 420ms ease;
}

h1 {
  margin: 0;
  font-size: clamp(34px, 6vw, 54px);
  letter-spacing: 0.04em;
}

.page-intro {
  margin: 17px 0 40px;
  color: var(--panel-muted);
  font-size: 15px;
  line-height: 1.9;
  transition: color 420ms ease;
}

.notes-list {
  display: grid;
  gap: 17px;
}

.note-link {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 18px;
  padding: 23px 25px;
  border: 1px solid var(--panel-border);
  border-radius: 15px;
  color: var(--panel-text);
  text-decoration: none;
  transition: transform 200ms ease, border-color 200ms ease, background-color 200ms ease;
}

.note-link:hover {
  transform: translateX(5px);
  border-color: color-mix(in srgb, var(--accent) 65%, transparent);
  background: rgba(255, 255, 255, 0.12);
}

.note-link-copy {
  display: grid;
  gap: 9px;
}

.note-link-date {
  color: var(--panel-muted);
  font-size: 12px;
  transition: color 420ms ease;
}

.note-link-title {
  font-size: 20px;
  font-weight: 650;
}

.note-link-arrow {
  color: var(--accent);
  font-size: 20px;
}

.back-link {
  padding: 5px 0;
  border: 0;
  color: var(--panel-muted);
  background: none;
  cursor: pointer;
}

.markdown-article {
  margin-top: 40px;
  animation: content-in 420ms 70ms ease both;
}

.markdown-article h1 {
  margin-bottom: 12px;
  font-size: clamp(30px, 5vw, 44px);
}

.markdown-article h2 {
  margin: 36px 0 12px;
  font-size: 24px;
}

.markdown-article h3 {
  margin: 28px 0 10px;
  font-size: 19px;
}

.markdown-date {
  margin: 0 0 30px;
  color: var(--panel-muted);
  font-size: 13px;
}

.markdown-article p,
.markdown-article li,
.markdown-article blockquote {
  color: var(--panel-muted);
  font-size: 15px;
  line-height: 2;
  transition: color 420ms ease;
}

.markdown-article p {
  margin: 0 0 18px;
}

.markdown-article ul,
.markdown-article ol {
  margin: 12px 0 22px;
  padding-left: 25px;
}

.markdown-article li {
  padding-left: 5px;
}

.markdown-article blockquote {
  margin: 24px 0;
  padding: 12px 20px;
  border-left: 3px solid var(--accent);
  background: rgba(255, 255, 255, 0.07);
}

.markdown-article code {
  padding: 2px 6px;
  border-radius: 5px;
  color: var(--panel-text);
  background: rgba(127, 127, 127, 0.15);
  font-family: Consolas, monospace;
}

.markdown-article pre {
  overflow-x: auto;
  padding: 17px 19px;
  border: 1px solid var(--panel-border);
  border-radius: 10px;
  background: rgba(127, 127, 127, 0.1);
}

.markdown-article pre code {
  padding: 0;
  background: none;
  line-height: 1.8;
}

/* ===== 空状态、页脚和页面过渡 ===== */
.empty-message,
.error-message {
  color: var(--panel-muted);
  line-height: 1.8;
}

.notes-footer {
  display: none;
}

[hidden] {
  display: none !important;
}

@keyframes slide-in {
  from { opacity: 0; transform: translateX(35px); }
  to { opacity: 1; transform: translateX(0); }
}

@keyframes content-in {
  from { opacity: 0; transform: translateY(10px); }
  to { opacity: 1; transform: translateY(0); }
}

@media (max-width: 600px) {
  /* 手机屏幕减少外边距和卡片留白，保持文字容易阅读。 */
  :root {
    --background-image: var(--mobile-background-image);
  }

  .notes-background .background-scene {
    background-position: center;
  }

  .notes-site {
    padding: 0;
  }

  .notes-header {
    min-height: 70px;
    padding: 14px 18px;
  }

  .notes-panel {
    padding: 92px 21px 36px;
  }

  .page-intro {
    margin-bottom: 30px;
  }

  .note-link {
    padding: 19px 17px;
  }

  .note-link-title {
    font-size: 18px;
  }

  .markdown-article {
    margin-top: 31px;
  }
}

@media (prefers-reduced-motion: reduce) {
  *,
  *::before,
  *::after {
    scroll-behavior: auto !important;
    animation-duration: 0.01ms !important;
    animation-iteration-count: 1 !important;
    transition-duration: 0.01ms !important;
  }

}