/**
 * 全站六套阅读主题：只改变纸张、墨色与强调色，保持日报的排版骨架稳定。
 */

:root,
:root[data-theme="classic"] {
  --ink: #171713;
  --muted-ink: #69665e;
  --paper: #f3f0e7;
  --paper-deep: #e9e4d7;
  --card: #fbfaf5;
  /* 弹窗使用独立纸面，备注与删除确认必须从同一变量读取。 */
  --dialog-surface: var(--paper);
  --line: #c9c2b2;
  --accent: #c94328;
  --accent-dark: #8c2f1c;
  --forest: #23483e;
  --link: #065fd4;
  --link-hover: #003d99;
  --link-on-dark: #8ab4f8;
  --masthead-bg: #171713;
  --masthead-text: #f7f1e4;
  --masthead-muted: #d9d1c1;
  --surface-glass: rgba(237, 232, 219, 0.78);
  --card-glass: rgba(251, 250, 245, 0.94);
  --paper-glass: rgba(243, 240, 231, 0.96);
  --grain-light: rgba(255, 255, 255, 0.65);
  --grain-line: rgba(39, 34, 25, 0.018);
}

:root[data-theme="quiet"] {
  --ink: #202124;
  --muted-ink: #74777c;
  --paper: #fbfbfa;
  --paper-deep: #f5f5f2;
  --card: #ffffff;
  --line: #e7e7e4;
  --accent: #176b55;
  --accent-dark: #11513f;
  --forest: #176b55;
  --link: #065fd4;
  --link-hover: #003d99;
  --link-on-dark: #8ab4f8;
  --masthead-bg: #ffffff;
  --masthead-text: #202124;
  --masthead-muted: #74777c;
  --surface-glass: rgba(245, 245, 242, 0.96);
  --card-glass: rgba(255, 255, 255, 0.98);
  --paper-glass: rgba(251, 251, 250, 0.96);
  --grain-light: rgba(255, 255, 255, 0);
  --grain-line: rgba(32, 33, 36, 0.008);
}

:root[data-theme="moon"] {
  --ink: #253542;
  --muted-ink: #64727c;
  --paper: #f3f7f8;
  --paper-deep: #e4ebee;
  --card: #fbfdfe;
  --line: #c5d0d6;
  --accent: #39789a;
  --accent-dark: #21566f;
  --forest: #38675e;
  --link: #075fae;
  --link-hover: #064a87;
  --link-on-dark: #9acbff;
  --masthead-bg: #1d2b36;
  --masthead-text: #f6fafb;
  --masthead-muted: #ced9de;
  --surface-glass: rgba(228, 235, 238, 0.82);
  --card-glass: rgba(251, 253, 254, 0.95);
  --paper-glass: rgba(243, 247, 248, 0.96);
  --grain-light: rgba(255, 255, 255, 0.76);
  --grain-line: rgba(37, 53, 66, 0.016);
}

:root[data-theme="forest"] {
  --ink: #19352c;
  --muted-ink: #5e7169;
  --paper: #edf2e9;
  --paper-deep: #dde7db;
  --card: #f8fbf6;
  --line: #bdcbbd;
  --accent: #35705a;
  --accent-dark: #20513f;
  --forest: #27634d;
  --link: #075fae;
  --link-hover: #064a87;
  --link-on-dark: #a9d7c5;
  --masthead-bg: #183128;
  --masthead-text: #f4f7ef;
  --masthead-muted: #cbd8ce;
  --surface-glass: rgba(221, 231, 219, 0.82);
  --card-glass: rgba(248, 251, 246, 0.95);
  --paper-glass: rgba(237, 242, 233, 0.96);
  --grain-light: rgba(255, 255, 255, 0.64);
  --grain-line: rgba(25, 53, 44, 0.018);
}

:root[data-theme="sand"] {
  --ink: #3b2c20;
  --muted-ink: #766655;
  --paper: #f5ead8;
  --paper-deep: #ead9bf;
  --card: #fff9ee;
  --line: #d1bfa5;
  --accent: #b75e31;
  --accent-dark: #7f3b1e;
  --forest: #556b3d;
  --link: #075fae;
  --link-hover: #064a87;
  --link-on-dark: #ffd0a8;
  --masthead-bg: #34261d;
  --masthead-text: #fff6e7;
  --masthead-muted: #e0cfba;
  --surface-glass: rgba(234, 217, 191, 0.82);
  --card-glass: rgba(255, 249, 238, 0.95);
  --paper-glass: rgba(245, 234, 216, 0.96);
  --grain-light: rgba(255, 255, 255, 0.52);
  --grain-line: rgba(59, 44, 32, 0.02);
}

:root[data-theme="white"] {
  --ink: #202124;
  --muted-ink: #70757a;
  --paper: #ffffff;
  --paper-deep: #f5f6f7;
  --card: #ffffff;
  --line: #e1e4e8;
  --accent: #1a73e8;
  --accent-dark: #174ea6;
  --forest: #336b57;
  --link: #0b57d0;
  --link-hover: #073e96;
  --link-on-dark: #8ab4f8;
  --masthead-bg: #ffffff;
  --masthead-text: #202124;
  --masthead-muted: #5f6368;
  --surface-glass: rgba(248, 249, 250, 0.96);
  --card-glass: rgba(255, 255, 255, 0.98);
  --paper-glass: rgba(255, 255, 255, 0.98);
  --grain-light: rgba(255, 255, 255, 0);
  --grain-line: rgba(32, 33, 36, 0.008);
  --shadow: 0 12px 36px rgba(32, 33, 36, 0.08);
}

:root[data-theme="night"] {
  --ink: #eee9dc;
  --muted-ink: #aaa79e;
  --paper: #171816;
  --paper-deep: #20221e;
  --card: #272923;
  --line: #484a42;
  --accent: #e17650;
  --accent-dark: #f09d7d;
  --forest: #8ab7a3;
  --link: #82b8ff;
  --link-hover: #b8d7ff;
  --link-on-dark: #a9ccff;
  --masthead-bg: #10110f;
  --masthead-text: #f6f0e3;
  --masthead-muted: #c6c0b4;
  --surface-glass: rgba(32, 34, 30, 0.9);
  --card-glass: rgba(39, 41, 35, 0.95);
  --paper-glass: rgba(23, 24, 22, 0.96);
  --grain-light: rgba(255, 255, 255, 0.025);
  --grain-line: rgba(255, 255, 255, 0.018);
  --shadow: 0 18px 50px rgba(0, 0, 0, 0.26);
}

/* 报头使用独立色值，夜间主题不会因正文墨色变亮而反转成白色报头。 */
.masthead,
.research-masthead {
  color: var(--masthead-text);
  background: var(--masthead-bg);
}

.notes-back-link,
.back-reader {
  color: var(--masthead-text);
  border-color: color-mix(in srgb, var(--masthead-text) 38%, transparent);
}

.notes-back-link:hover,
.back-reader:hover {
  color: var(--masthead-text);
}

.brand-block .edition,
.research-brand .edition,
.brand-block p,
.research-brand p,
.notes-entry,
.research-entry,
.research-metrics span,
.metrics span {
  color: var(--masthead-muted);
}

.paper-grain {
  background-image:
    radial-gradient(circle at 20% 10%, var(--grain-light), transparent 25%),
    repeating-linear-gradient(90deg, var(--grain-line) 0 1px, transparent 1px 4px);
}

/* 主题入口保持为小图标，不与笔记和研究导航抢视觉层级。 */
.theme-switcher {
  position: relative;
  display: flex !important;
  align-items: center;
  justify-content: center;
  min-width: 32px !important;
  text-align: initial !important;
}

.theme-trigger {
  display: grid;
  width: 32px;
  height: 32px;
  padding: 0;
  place-items: center;
  color: var(--masthead-muted);
  background: transparent;
  border: 1px solid color-mix(in srgb, var(--masthead-text) 38%, transparent);
  border-radius: 50%;
  cursor: pointer;
  transition: color 150ms ease, background 150ms ease, border-color 150ms ease, transform 150ms ease;
}

.theme-trigger svg {
  width: 17px;
  height: 17px;
  overflow: visible;
  fill: none;
  stroke: currentColor;
  stroke-linecap: round;
  stroke-linejoin: round;
  stroke-width: 1.7;
}

.theme-trigger svg circle {
  fill: currentColor;
  stroke: none;
}

.theme-trigger:hover,
.theme-trigger[aria-expanded="true"] {
  color: #fff;
  background: var(--accent);
  border-color: var(--accent);
  transform: translateY(-1px);
}

.theme-trigger:focus-visible,
.theme-option:focus-visible {
  outline: 2px solid var(--link-on-dark);
  outline-offset: 3px;
}

.theme-popover {
  position: absolute;
  top: calc(100% + 12px);
  right: 0;
  z-index: 300;
  width: 256px;
  padding: 14px;
  color: var(--ink);
  background: var(--card-glass);
  border: 1px solid var(--line);
  border-radius: 14px;
  box-shadow: 0 18px 50px rgba(12, 13, 11, 0.24);
  backdrop-filter: blur(18px);
}

.theme-popover::before {
  position: absolute;
  top: -5px;
  right: 11px;
  width: 9px;
  height: 9px;
  content: "";
  background: var(--card);
  border-top: 1px solid var(--line);
  border-left: 1px solid var(--line);
  transform: rotate(45deg);
}

.theme-popover[hidden] {
  display: none !important;
}

.theme-popover-heading {
  display: flex;
  align-items: end;
  justify-content: space-between;
  padding: 2px 2px 11px;
  border-bottom: 1px solid var(--line);
}

.theme-popover-heading div {
  display: grid;
  gap: 3px;
}

.theme-popover-heading span {
  color: var(--accent);
  font: 700 8px/1 ui-monospace, monospace;
  letter-spacing: 0.18em;
}

.theme-popover-heading strong {
  color: var(--ink);
  font-size: 14px;
}

.theme-popover-heading small {
  color: var(--muted-ink);
  font-size: 10px;
}

.theme-options {
  display: grid;
  gap: 4px;
  padding-top: 8px;
}

.theme-option {
  display: grid;
  grid-template-columns: 56px 1fr;
  gap: 10px;
  align-items: center;
  min-height: 48px;
  padding: 7px 8px;
  color: var(--ink);
  text-align: left;
  background: transparent;
  border: 1px solid transparent;
  border-radius: 9px;
  cursor: pointer;
  transition: background 130ms ease, border-color 130ms ease, transform 130ms ease;
}

.theme-option:hover {
  background: var(--paper-deep);
  border-color: var(--line);
  transform: translateX(2px);
}

.theme-option.is-active {
  background: color-mix(in srgb, var(--accent) 11%, var(--card));
  border-color: color-mix(in srgb, var(--accent) 55%, var(--line));
}

.theme-option-swatch {
  display: flex;
  width: 52px;
  height: 28px;
  overflow: hidden;
  border: 1px solid color-mix(in srgb, var(--ink) 20%, transparent);
  border-radius: 7px;
  box-shadow: 0 2px 7px rgba(12, 13, 11, 0.1);
}

.theme-option-swatch i {
  flex: 1;
  height: 100%;
}

.theme-option-copy {
  display: grid;
  gap: 3px;
  color: var(--ink);
}

.theme-popover .theme-option-copy strong {
  color: var(--ink);
  font-size: 12px;
  line-height: 1.15;
}

.theme-option-copy small {
  color: var(--muted-ink);
  font-size: 9px;
  letter-spacing: 0.08em;
}

/* 笔记页和研究页增加一个小图标列，保持右上角对齐。 */
.notes-masthead {
  grid-template-columns: auto 1fr auto auto;
}

.research-masthead {
  grid-template-columns: auto 1fr auto auto auto;
}

/* 用主题玻璃色覆盖主要半透明表面，确保五套皮肤都不是局部换色。 */
.archive-panel,
.toc-panel,
.notes-filters,
.notes-context,
.ask-panel,
.report-toc {
  background: var(--surface-glass);
}

.article-sticky-header,
.note-card,
.history-item,
.source-card,
.theme-popover,
.day-navigation-card {
  background: var(--card-glass);
}

.article-hero {
  background: var(--paper-glass);
}

.section-body,
.intro-block,
.note-card-note,
.context-hint {
  color: var(--ink);
}

.article-panel,
.result-panel,
.drawer-body {
  background-color: var(--paper);
}

/* 夜读主题补齐旧样式中的硬编码浅色表面与正文颜色。 */
.confirm-dialog,
.note-dialog {
  background: var(--dialog-surface);
}

:root[data-theme="night"] .archive-collapse-toggle,
:root[data-theme="night"] .toc-toggle,
:root[data-theme="night"] .archive-tools select,
:root[data-theme="night"] .archive-tools button,
:root[data-theme="night"] .search-box input,
:root[data-theme="night"] .toc-depth-toggle,
:root[data-theme="night"] .notes-filters input,
:root[data-theme="night"] .notes-filters select,
:root[data-theme="night"] .notes-filter-actions button,
:root[data-theme="night"] .notes-filter-actions a,
:root[data-theme="night"] .ask-form textarea,
:root[data-theme="night"] .confirm-dialog,
:root[data-theme="night"] .source-drawer {
  color: var(--ink);
  background: var(--dialog-surface);
  border-color: var(--line);
}

:root[data-theme="night"] .community-action,
:root[data-theme="night"] .annotation-toggle {
  appearance: none;
  color: var(--ink);
  background: var(--card);
  border-color: var(--line);
}

:root[data-theme="night"] .community-action:hover,
:root[data-theme="night"] .annotation-toggle:hover,
:root[data-theme="night"] .annotation-toggle[aria-expanded="true"] {
  color: var(--accent-dark);
  background: var(--paper-deep);
  border-color: var(--accent);
}

:root[data-theme="night"] .annotation-popover,
:root[data-theme="night"] .note-dialog {
  color: var(--ink);
  background: var(--dialog-surface);
  border-color: var(--line);
}

/* 简白主题取消报纸阴影和浓重纹理，呈现现代文档式阅读界面。 */
:root[data-theme="white"] .masthead,
:root[data-theme="white"] .research-masthead {
  border-bottom-width: 1px;
  box-shadow: 0 1px 0 var(--line);
}

:root[data-theme="white"] .notes-entry,
:root[data-theme="white"] .research-entry {
  border-color: var(--line);
}

:root[data-theme="white"] .paper-grain {
  opacity: 0.18;
}

:root[data-theme="night"] .article-body,
:root[data-theme="night"] .article-body p,
:root[data-theme="night"] .article-body li,
:root[data-theme="night"] .note-card-note,
:root[data-theme="night"] .context-hint,
:root[data-theme="night"] .report-body,
:root[data-theme="night"] .report-body p,
:root[data-theme="night"] .report-body li {
  color: var(--ink);
}

:root[data-theme="night"] .day-navigation-card:hover:not(:disabled),
:root[data-theme="night"] .toc-link:hover,
:root[data-theme="night"] .history-item:hover {
  background: var(--card);
}

@media (max-width: 900px) {
  .research-masthead {
    grid-template-columns: 1fr auto auto;
  }
}

@media (max-width: 680px) {
  .metrics {
    gap: 8px;
  }

  .metrics > div:not(.theme-switcher),
  .research-metrics {
    display: none;
  }

  .notes-masthead {
    grid-template-columns: 1fr auto auto;
  }

  .masthead-rule {
    display: none;
  }

  .theme-popover {
    position: fixed;
    top: 68px;
    right: 12px;
    width: min(256px, calc(100vw - 24px));
  }
}

@media (prefers-reduced-motion: reduce) {
  .theme-trigger,
  .theme-option {
    transition: none;
  }
}

@media print {
  .theme-switcher {
    display: none !important;
  }
}