/* SimAsst 全站统一 UI 基础层
 * 目标：一套设计令牌 + 一套控件外观，供首页 / 博客 / 论坛 / 创作台 / 网盘 / 在线工具 / 教程共用。
 * 该样式表在所有主题样式之后加载，同名属性以此处为准；页面特有布局仍由各自主题样式控制。
 */

:root {
  /* 品牌与语义色 */
  --brand: #0a9676;
  --brand-dark: #087a60;
  --brand-soft: #e7f6f2;
  --brand-line: #b7ddd2;
  --text: #1c2833;
  --muted: #5c6b7a;
  --line: #e2e8ef;
  --line-strong: #cfd9e4;
  --bg: #f4f7f8;
  --card: #ffffff;
  --warn: #b45309;
  --danger: #b42318;
  --ok: #0a7a5c;

  /* 圆角与阴影：三级即可，避免各页各写一套 */
  --r-sm: 6px;
  --r: 10px;
  --r-lg: 14px;
  --r-pill: 999px;
  --sh-1: 0 1px 2px rgba(16, 32, 48, 0.06);
  --sh-2: 0 8px 24px rgba(15, 35, 55, 0.10);
  --sh-3: 0 16px 40px rgba(15, 35, 55, 0.16);

  /* 尺寸 */
  --nav-h: 56px;
  --ctl-h: 34px;

  /* 内容宽度：两档即可（正文 / 宽屏栅格） */
  --content-w: 1060px;
  --content-w-narrow: 760px;

  /* 间距节奏：三级，避免各页各写一套 */
  --gap-sm: 8px;
  --gap: 16px;
  --gap-lg: 24px;

  /* 字号阶梯 */
  --fs-xs: 12px;
  --fs-sm: 13px;
  --fs: 14px;
  --fs-md: 16px;
  --fs-lg: 20px;
  --fs-xl: 26px;

  --font: -apple-system, BlinkMacSystemFont, "Segoe UI", "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", sans-serif;
  --mono: Consolas, "Sarasa Mono SC", "Courier New", monospace;
}

@media (max-width: 767px) {
  :root {
    --nav-h: 52px;
  }
}

/* ============ 基础排版 ============ */
*,
*::before,
*::after {
  box-sizing: border-box;
}

body {
  font-family: var(--font);
  -webkit-text-size-adjust: 100%;
  text-size-adjust: 100%;
}

/* 统一的键盘焦点环，替换各页零散的 outline:none */
a:focus-visible,
button:focus-visible,
input:focus-visible,
select:focus-visible,
textarea:focus-visible,
[tabindex]:focus-visible {
  outline: 2px solid var(--brand);
  outline-offset: 2px;
  border-radius: var(--r-sm);
}

/* 尊重系统「减少动效」设置 */
@media (prefers-reduced-motion: reduce) {
  *,
  *::before,
  *::after {
    animation-duration: 0.001ms !important;
    animation-iteration-count: 1 !important;
    transition-duration: 0.001ms !important;
    scroll-behavior: auto !important;
  }
}

/* ============ 统一页头 ============ */
/* 皮肤部分：四类页头（.navbar / .c-header / .tools-header / .tutorial-header）共用 */
.site-header {
  background: rgba(20, 28, 36, 0.94);
  background-image: none;
  border: 0;
  border-bottom: 1px solid rgba(255, 255, 255, 0.08);
  box-shadow: none;
  backdrop-filter: blur(10px);
  -webkit-backdrop-filter: blur(10px);
  color: #fff;
}

.site-header,
.site-header * {
  font-family: var(--font);
}

.site-header a {
  color: rgba(255, 255, 255, 0.88);
  text-decoration: none;
}

.site-header a:hover,
.site-header a:focus-visible {
  color: #7ee8c8;
}

/* 教程页「下载」等强调入口要保留自己的高亮色，不能被上面的通用链接色压掉 */
.site-header .tutorial-back,
.site-header .tutorial-nav a.tutorial-back {
  color: #7ee8c8;
}

/* 品牌区：首页 / 社区 / 工具 / 教程各自的类名不同，统一到同一外观 */
.site-header .navbar-brand,
.site-header .c-brand,
.site-header .tools-brand,
.site-header .tutorial-home {
  flex: none;
  font-size: 16px;
  font-weight: 700;
  letter-spacing: 0.02em;
  color: #fff;
  white-space: nowrap;
}

/* 导航容器：桌面自然排布，窄屏横向滑动而不是直接隐藏入口 */
.site-header nav {
  display: flex;
  align-items: center;
  gap: 2px;
  flex: 1 1 auto;
  min-width: 0;
  overflow-x: auto;
  overscroll-behavior-x: contain;
  scrollbar-width: none;
}

.site-header nav::-webkit-scrollbar {
  display: none;
}

.site-header nav a,
.site-header .tools-header-link,
.site-header .tutorial-back {
  display: inline-flex;
  align-items: center;
  gap: 4px;
  flex: none;
  padding: 6px 11px;
  border: 0;
  border-radius: var(--r-sm);
  font-size: 14px;
  line-height: 1.4;
  white-space: nowrap;
  transition: background-color 0.18s ease, color 0.18s ease;
}

.site-header nav a:hover,
.site-header .tools-header-link:hover,
.site-header .tutorial-back:hover {
  background: rgba(255, 255, 255, 0.10);
  color: #fff;
  text-decoration: none;
}

/* 当前页：品牌色实心胶囊，四套页头表现一致 */
.site-header nav a[aria-current="page"],
.site-header nav a[aria-current="page"]:hover {
  background: var(--brand);
  color: #fff;
  font-weight: 600;
}

/* 首页 Bootstrap 导航：与社区/工具/教程页头共用同一套胶囊外观。
   首页 <nav> 自身带 .site-header，内部没有嵌套 <nav>，所以上面的
   `.site-header nav a` 对首页落空，这里单独补齐。 */
.navbar.site-header .navbar-nav > li > a {
  display: inline-flex;
  align-items: center;
  margin: 6px 2px;
  padding: 7px 12px;
  border: 0;
  border-radius: var(--r-sm);
  font-size: var(--fs);
  line-height: 1.4;
  color: rgba(255, 255, 255, 0.88);
  white-space: nowrap;
  transition: background-color 0.18s ease, color 0.18s ease;
}

.navbar.site-header .navbar-nav > li > a:hover,
.navbar.site-header .navbar-nav > li > a:focus {
  background: rgba(255, 255, 255, 0.10);
  color: #fff;
}

/* 当前项：品牌色实心胶囊，四套页头表现一致 */
.navbar.site-header .navbar-nav > .active > a,
.navbar.site-header .navbar-nav > .active > a:hover,
.navbar.site-header .navbar-nav > .active > a:focus {
  background: var(--brand);
  color: #fff;
  font-weight: 600;
}

/* 布局部分：只作用于 c-header / tools-header 这类普通页头，
   不动首页 Bootstrap（靠 fixed+body padding）和教程（靠 --header-h + 侧栏）的既有定位方式 */
.site-header:not(.navbar):not(.tutorial-header) {
  position: sticky;
  top: 0;
  z-index: 100;
  display: flex;
  align-items: center;
  gap: 14px;
  min-height: var(--nav-h);
  padding: env(safe-area-inset-top, 0px) 18px 0;
}

.site-header:not(.navbar):not(.tutorial-header) .c-nav,
.site-header:not(.navbar):not(.tutorial-header) .tools-header-nav {
  margin-left: auto;
}

/* 在线工具页头：标题占满剩余空间，导航按需收缩即可 */
.site-header .tools-header-nav {
  flex: 0 1 auto;
}

/* 教程页头：品牌在窄屏要让位给侧栏按钮，导航只在宽屏出现 */
@media (max-width: 900px) {
  .site-header .tutorial-nav {
    display: none;
  }
}

@media (max-width: 767px) {
  .site-header .tutorial-home {
    flex: 1 1 auto;
    min-width: 0;
    overflow: hidden;
    text-overflow: ellipsis;
  }
}

@media (max-width: 767px) {
  .site-header:not(.navbar):not(.tutorial-header) {
    gap: 8px;
    padding-left: max(12px, env(safe-area-inset-left, 0px));
    padding-right: max(12px, env(safe-area-inset-right, 0px));
  }

  /* 窄屏导航不再隐藏：整条可横向滑动，首尾留一点呼吸位 */
  .site-header nav {
    padding: 2px 0;
    -webkit-overflow-scrolling: touch;
  }

  .site-header nav a,
  .site-header .tools-header-link {
    padding: 7px 10px;
    font-size: 14px;
  }
}

/* 首页导航里的分组分隔线：锚点区 / 站内外链区 */
.site-header .nav-divider {
  width: 1px;
  height: 18px;
  margin: 0 6px;
  padding: 0;
  background: rgba(255, 255, 255, 0.22);
  list-style: none;
}

@media (max-width: 767px) {
  .site-header .nav-divider {
    display: none;
  }
}

/*首页 Bootstrap 导航：去掉默认圆角与渐变，高度与社区页头一致 */
.navbar.site-header {
  min-height: var(--nav-h);
  margin-bottom: 0;
  border: 0;
  border-radius: 0;
  padding-top: env(safe-area-inset-top, 0px);
}

.navbar.site-header .navbar-nav > li > a {
  padding-top: 10px;
  padding-bottom: 10px;
}

.navbar.site-header .navbar-brand {
  height: var(--nav-h);
  line-height: calc(var(--nav-h) - 4px);
  padding-top: 0;
  padding-bottom: 0;
}

.navbar.site-header .navbar-toggle {
  border-color: rgba(255, 255, 255, 0.28);
  margin-top: 9px;
  margin-bottom: 9px;
}

.navbar.site-header .navbar-toggle .icon-bar {
  background: #fff;
}

.navbar.site-header .navbar-collapse {
  border-color: rgba(255, 255, 255, 0.12);
}

/* 教程页头沿用固定定位，只借用皮肤 */
.tutorial-header.site-header {
  box-shadow: none;
}

/* ============ 首页页头（自定义结构，不再依赖 Bootstrap navbar） ============ */
.site-header.site-nav:not(.navbar) {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  z-index: 100;
  display: flex;
  align-items: center;
  min-height: var(--nav-h);
  padding: env(safe-area-inset-top, 0px) 0 0;
}

.site-nav-inner {
  display: flex;
  align-items: center;
  gap: var(--gap);
  width: 100%;
  max-width: 1240px;
  margin: 0 auto;
  padding-left: max(18px, env(safe-area-inset-left, 0px));
  padding-right: max(18px, env(safe-area-inset-right, 0px));
}

.site-header .site-brand {
  flex: none;
  font-size: 17px;
  font-weight: 700;
  letter-spacing: 0.02em;
  color: #fff;
  text-decoration: none;
  white-space: nowrap;
}

.site-header .site-brand:hover,
.site-header .site-brand:focus-visible {
  color: #7ee8c8;
  text-decoration: none;
}

.site-nav .site-nav-menu {
  flex: 0 1 auto;
  margin-left: auto;
}

.site-nav-menu ul {
  display: flex;
  align-items: center;
  justify-content: flex-end;
  gap: 2px;
  list-style: none;
  margin: 0;
  padding: 0;
}

.site-nav-menu li {
  flex: none;
  list-style: none;
}

/* 汉堡按钮：宽屏隐藏 */
.nav-toggle {
  display: none;
  align-items: center;
  justify-content: center;
  width: 40px;
  height: 40px;
  margin-left: auto;
  padding: 0;
  border: 1px solid rgba(255, 255, 255, 0.28);
  border-radius: var(--r-sm);
  background: transparent;
  color: #fff;
  cursor: pointer;
  transition: background-color 0.18s ease, border-color 0.18s ease;
}

.nav-toggle:hover {
  background: rgba(255, 255, 255, 0.12);
  border-color: rgba(255, 255, 255, 0.5);
}

.nav-toggle .nav-toggle-bars {
  display: flex;
  flex-direction: column;
  justify-content: center;
  gap: 4px;
  width: 18px;
}

.nav-toggle .nav-toggle-bars i {
  display: block;
  height: 2px;
  border-radius: 2px;
  background: currentColor;
  transition: transform 0.2s ease, opacity 0.2s ease;
}

/* 展开态：三条杠变叉 */
.nav-toggle[aria-expanded="true"] .nav-toggle-bars i:nth-child(1) {
  transform: translateY(6px) rotate(45deg);
}

.nav-toggle[aria-expanded="true"] .nav-toggle-bars i:nth-child(2) {
  opacity: 0;
}

.nav-toggle[aria-expanded="true"] .nav-toggle-bars i:nth-child(3) {
  transform: translateY(-6px) rotate(-45deg);
}

@media (max-width: 991px) {
  .site-nav .nav-toggle {
    display: inline-flex;
  }

  .site-nav .site-nav-menu {
    position: absolute;
    top: 100%;
    left: 0;
    right: 0;
    display: none;
    margin: 0;
    padding: 6px 0 12px;
    background: rgba(18, 26, 34, 0.98);
    border-top: 1px solid rgba(255, 255, 255, 0.08);
    box-shadow: var(--sh-2);
    max-height: 70vh;
    overflow-y: auto;
    -webkit-overflow-scrolling: touch;
    overscroll-behavior: contain;
  }

  .site-nav .site-nav-menu.is-open {
    display: block;
  }

  .site-nav-menu ul {
    flex-direction: column;
    align-items: stretch;
    justify-content: flex-start;
    gap: 0;
  }

  .site-nav-menu a {
    display: block;
    padding: 13px max(18px, env(safe-area-inset-left, 0px));
    border-radius: 0;
    font-size: 15px;
  }

  .site-nav-menu a:hover,
  .site-nav-menu a:focus-visible {
    background: rgba(255, 255, 255, 0.08);
  }
}

/* ============ 统一按钮 ============ */
/* 一套基础 + 品牌 / 次要 / 危险 / 小号 / 图标五种变体；
   .btn（在线工具）与 .c-btn（社区）语义对齐，.btn-secondary / .c-btn-ghost 同为次要按钮 */
.btn,
.btn-primary,
.btn-secondary,
.btn-danger,
.c-btn,
.c-btn-ghost,
.c-boards button {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 6px;
  min-height: var(--ctl-h);
  padding: 6px 14px;
  border: 1px solid var(--line-strong);
  border-radius: var(--r-sm);
  background: #fff;
  color: var(--text);
  font-family: inherit;
  font-size: 14px;
  font-weight: 500;
  line-height: 1.4;
  text-decoration: none;
  white-space: nowrap;
  cursor: pointer;
  transition: background-color 0.18s ease, border-color 0.18s ease, color 0.18s ease, box-shadow 0.18s ease;
}

.btn:hover,
.c-btn:hover,
.c-btn-ghost:hover,
.c-boards button:hover {
  border-color: var(--brand-line);
  background: var(--brand-soft);
  color: var(--brand-dark);
  text-decoration: none;
}

.btn:active,
.c-btn:active,
.c-btn-ghost:active,
.c-boards button:active {
  transform: translateY(1px);
}

/* 品牌实心 */
.btn-primary,
.c-btn,
.c-boards button[aria-pressed="true"] {
  background: var(--brand);
  border-color: var(--brand);
  color: #fff;
}

.btn-primary:hover:not(:disabled),
.c-btn:hover,
.c-boards button[aria-pressed="true"]:hover {
  background: var(--brand-dark);
  border-color: var(--brand-dark);
  color: #fff;
}

/* 次要 / 描边 */
.btn-secondary,
.c-btn-ghost {
  background: #fff;
  border-color: var(--line-strong);
  color: var(--text);
}

.btn-secondary:hover:not(:disabled),
.c-btn-ghost:hover {
  background: var(--brand-soft);
  border-color: var(--brand-line);
  color: var(--brand-dark);
}

/* 危险 */
.btn-danger,
.c-btn.danger,
.c-btn-ghost.danger {
  background: #fff;
  border-color: #f0c9c6;
  color: var(--danger);
}

.btn-danger:hover:not(:disabled),
.c-btn.danger:hover,
.c-btn-ghost.danger:hover {
  background: #fef2f2;
  border-color: #e4a7a2;
  color: #8f1d15;
}

.btn:disabled,
.c-btn:disabled,
.c-btn-ghost:disabled,
.c-boards button:disabled,
.btn-primary:disabled,
.btn-secondary:disabled,
.btn-danger:disabled {
  opacity: 0.5;
  cursor: not-allowed;
}

.btn:disabled:hover,
.c-btn:disabled:hover,
.c-btn-ghost:disabled:hover {
  background: #fff;
  border-color: var(--line-strong);
  color: var(--text);
}

.btn-primary:disabled:hover {
  background: var(--brand);
  border-color: var(--brand);
  color: #fff;
}

/* 小号按钮：工具条、行内操作 */
.btn-sm,
.disk-tool,
.studio-tool {
  min-height: 30px;
  padding: 4px 10px;
  font-size: 13px;
}

/* 图标按钮 */
.btn-icon {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 28px;
  height: 28px;
  min-height: 0;
  padding: 0;
  border: 0;
  border-radius: var(--r-sm);
  background: #fee2e2;
  color: #b91c1c;
  font-size: 15px;
  line-height: 1;
  cursor: pointer;
}

.btn-icon:hover {
  background: #fecaca;
}

/* 按钮组 */
.btn-row,
.c-tools,
.c-boards,
.studio-attach-actions,
.studio-quick {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  align-items: center;
}

/* 触屏加大点击区域 */
@media (hover: none) and (pointer: coarse) {
  .btn,
  .btn-primary,
  .btn-secondary,
  .btn-danger,
  .c-btn,
  .c-btn-ghost,
  .c-boards button {
    min-height: 40px;
    padding: 8px 16px;
  }
}

/* ============ 统一表单控件 ============ */
/* 只统一外观，不改宽度/布局，避免打断各页既有栅格 */
input,
select,
textarea {
  font-family: inherit;
  font-size: 14px;
  color: var(--text);
}

input:not([type="checkbox"]):not([type="radio"]):not([type="range"]):not([type="file"]):not([type="color"]),
select,
textarea {
  padding: 7px 10px;
  border: 1px solid var(--line-strong);
  border-radius: var(--r-sm);
  background: #fff;
  transition: border-color 0.18s ease, box-shadow 0.18s ease;
}

input:not([type="checkbox"]):not([type="radio"]):not([type="range"]):not([type="file"]):not([type="color"]):focus,
select:focus,
textarea:focus {
  outline: none;
  border-color: var(--brand);
  box-shadow: 0 0 0 3px rgba(10, 150, 118, 0.15);
}

input::placeholder,
textarea::placeholder {
  color: #9aa7b4;
}

input[type="checkbox"],
input[type="radio"] {
  accent-color: var(--brand);
}

select {
  appearance: none;
  -webkit-appearance: none;
  padding-right: 28px;
  background-image: url("data:image/svg+xml;charset=utf-8,%3Csvg xmlns='http://www.w3.org/2000/svg' viewBox='0 0 12 12'%3E%3Cpath fill='%235c6b7a' d='M6 8.5 2.5 5h7z'/%3E%3C/svg%3E");
  background-repeat: no-repeat;
  background-position: right 9px center;
  background-size: 12px 12px;
}

/* ============ 统一卡片与提示 ============ */
.c-card,
.c-thread,
.c-reply,
.c-editor,
.c-side,
.c-note,
.panel,
.tool-card {
  border-radius: var(--r);
  box-shadow: var(--sh-1);
}

.c-note,
.tip-box {
  border-left: 3px solid var(--brand);
}

.c-error {
  border-radius: var(--r-sm);
  padding: 8px 10px;
  color: var(--danger);
  background: #fef2f2;
}

/* ============ 统一页脚 ============ */
.c-foot,
.tools-footer,
.site-icp-footer {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  justify-content: center;
  gap: 6px;
  padding: 18px 16px 26px;
  color: var(--muted);
  font-size: 13px;
  line-height: 1.6;
  text-align: center;
  background: transparent;
  backdrop-filter: none;
  -webkit-backdrop-filter: none;
}

.c-foot a,
.tools-footer a,
.site-icp-footer a {
  color: var(--muted);
  text-decoration: none;
}

.c-foot a:hover,
.tools-footer a:hover,
.site-icp-footer a:hover {
  color: var(--brand-dark);
  text-decoration: underline;
}

.site-icp-footer {
  position: relative;
  z-index: 1;
  border-top: 1px solid var(--line);
}

/* 页脚里的分隔符：跟随各页脚的 muted 文字色，白底上也能看见 */
.site-icp-footer .site-icp-sep,
.c-foot .site-icp-sep,
.tools-footer .site-icp-sep {
  color: var(--line-strong);
  user-select: none;
}

.site-icp-footer .site-mps-beian {
  display: inline-flex;
  align-items: center;
  gap: 4px;
}

.site-icp-footer .site-mps-beian img {
  width: 16px;
  height: 16px;
}

/* ============ 触屏兜底：hover 才出现的控件常显 ============ */
/* 键盘可达：靠 hover 才显形的行内操作，聚焦时也要出现 */
.disk-row:focus-within .disk-ops,
.disk-tile:focus-within .disk-ops,
.disk-ops:focus-within {
  opacity: 1;
}

.chart-wrap--has-data .chart-copy-btn:focus-visible {
  opacity: 1;
}

@media (hover: none) and (pointer: coarse) {
  .disk-ops,
  .disk-row:hover .disk-ops,
  .disk-row.is-on .disk-ops,
  .disk-tile:hover .disk-ops,
  .disk-tile.is-on .disk-ops {
    opacity: 1;
  }

  .chart-wrap--has-data .chart-copy-btn {
    opacity: 1;
  }

  /* 删除类图标按钮在触屏上也要够大 */
  .btn-icon,
  .btn-icon-sm {
    width: 40px;
    height: 40px;
    font-size: 18px;
  }
}

/* ============ 统一标签 / 徽标 ============ */
/* 之前 media-label / feature-tags span / trial-offer-badge / c-tag / c-level /
   tools-badge / tool-card-tag 各写一套，这里收敛成一个 .tag + 尺寸/语义变体 */
.tag,
.media-label,
.feature-tags span,
.trial-offer-badge,
.c-tag,
.c-level,
.c-bounty,
.c-pin,
.tools-badge,
.tool-card-tag,
.studio-mode,
.badge-count {
  display: inline-flex;
  align-items: center;
  gap: 4px;
  padding: 3px 10px;
  border: 1px solid transparent;
  border-radius: var(--r-pill);
  background: var(--brand-soft);
  color: var(--brand-dark);
  font-size: var(--fs-xs);
  font-weight: 500;
  line-height: 1.5;
  white-space: nowrap;
  vertical-align: middle;
}

.tag--solid,
.trial-offer-badge,
.c-pin,
.tools-badge {
  background: var(--brand);
  border-color: var(--brand);
  color: #fff;
}

.tag--warn,
.c-bounty {
  background: #fff5e0;
  border-color: #f2d9a0;
  color: #8a5a06;
}

.tag--muted,
.c-level,
.studio-mode,
.badge-count {
  background: #eef2f6;
  border-color: var(--line);
  color: var(--muted);
}

.tag--lg {
  padding: 5px 12px;
  font-size: var(--fs-sm);
}

/* 深色区块（首页下载页、hero）上的标签 */
.trial-offer .trial-offer-badge {
  background: rgba(0, 0, 0, 0.18);
  border-color: rgba(255, 255, 255, 0.28);
  color: #dff7ef;
  letter-spacing: 0.04em;
}

/* ============ 统一卡片头 ============ */
.card-head {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: var(--gap-sm);
  margin-bottom: 12px;
}

.card-head h2,
.card-head h3 {
  margin: 0;
  font-size: var(--fs-lg);
  font-weight: 600;
  color: var(--text);
}

.card-head .card-head-actions {
  display: flex;
  flex-wrap: wrap;
  gap: var(--gap-sm);
  margin-left: auto;
}

/* ============ 统一空状态 / 加载态 / 错误态 ============ */
.empty-state {
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  gap: 10px;
  padding: 40px 20px;
  border: 1px dashed var(--line-strong);
  border-radius: var(--r);
  background: #fafbfc;
  color: var(--muted);
  font-size: var(--fs);
  line-height: 1.6;
  text-align: center;
}

.empty-state .empty-title {
  font-size: var(--fs-md);
  font-weight: 600;
  color: var(--text);
}

.empty-state .empty-hint {
  font-size: var(--fs-sm);
  color: var(--muted);
}

/* 骨架屏：比「正在加载…」纯文本更明确 */
.loading-state {
  padding: 24px 0;
}

.loading-state .sk-row {
  height: 14px;
  margin-bottom: 10px;
  border-radius: var(--r-sm);
  background: linear-gradient(90deg, #eef2f6 25%, #e3e9ef 37%, #eef2f6 63%);
  background-size: 400% 100%;
  animation: skShimmer 1.3s ease-in-out infinite;
}

.loading-state .sk-row:last-child {
  margin-bottom: 0;
}

.loading-state .sk-row:nth-child(2) { width: 88%; }
.loading-state .sk-row:nth-child(3) { width: 72%; }

@keyframes skShimmer {
  0% { background-position: 100% 50%; }
  100% { background-position: 0 50%; }
}

/* ============ 统一提示条 ============ */
.note,
.tip-box {
  display: block;
  padding: 12px 14px;
  border: 1px solid var(--brand-line);
  border-left: 3px solid var(--brand);
  border-radius: var(--r-sm);
  background: var(--brand-soft);
  color: var(--text);
  font-size: var(--fs-sm);
  line-height: 1.65;
}

.note--warn {
  border-color: #f2d9a0;
  border-left-color: var(--warn);
  background: #fff8ec;
}

.note--danger {
  border-color: #f0c9c6;
  border-left-color: var(--danger);
  background: #fef2f2;
}

/* ============ 统一 Toast ============ */
.ui-toast-host {
  position: fixed;
  left: 50%;
  bottom: calc(24px + env(safe-area-inset-bottom, 0px));
  z-index: 9999;
  display: flex;
  flex-direction: column;
  gap: 8px;
  align-items: center;
  transform: translateX(-50%);
  pointer-events: none;
}

.ui-toast {
  max-width: min(90vw, 420px);
  padding: 10px 16px;
  border-radius: var(--r-sm);
  background: rgba(24, 34, 44, 0.94);
  color: #fff;
  font-size: var(--fs);
  line-height: 1.5;
  box-shadow: var(--sh-3);
  opacity: 0;
  transform: translateY(8px);
  transition: opacity 0.22s ease, transform 0.22s ease;
}

.ui-toast.is-visible {
  opacity: 1;
  transform: translateY(0);
}

.ui-toast.is-ok { background: rgba(10, 122, 92, 0.95); }
.ui-toast.is-error { background: rgba(150, 32, 24, 0.95); }

/* ============ 返回顶部 ============ */
.back-to-top {
  position: fixed;
  right: max(20px, env(safe-area-inset-right, 0px));
  bottom: calc(24px + env(safe-area-inset-bottom, 0px));
  z-index: 90;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 44px;
  height: 44px;
  padding: 0;
  border: 1px solid var(--line-strong);
  border-radius: 50%;
  background: rgba(255, 255, 255, 0.94);
  color: var(--brand-dark);
  font-size: 18px;
  line-height: 1;
  cursor: pointer;
  box-shadow: var(--sh-2);
  opacity: 0;
  visibility: hidden;
  transform: translateY(10px);
  transition: opacity 0.22s ease, transform 0.22s ease, visibility 0.22s ease, background 0.18s ease;
}

.back-to-top.is-visible {
  opacity: 1;
  visibility: visible;
  transform: translateY(0);
}

.back-to-top:hover {
  background: var(--brand);
  border-color: var(--brand);
  color: #fff;
}

.back-to-top svg {
  width: 18px;
  height: 18px;
}

/* ============ 无障碍辅助 ============ */
.sr-only {
  position: absolute;
  width: 1px;
  height: 1px;
  padding: 0;
  margin: -1px;
  overflow: hidden;
  clip: rect(0, 0, 0, 0);
  white-space: nowrap;
  border: 0;
}

.skip-link {
  position: absolute;
  left: 12px;
  top: -60px;
  z-index: 999;
  padding: 10px 16px;
  border-radius: var(--r-sm);
  background: var(--brand);
  color: #fff;
  font-size: var(--fs);
  text-decoration: none;
  transition: top 0.18s ease;
}

.skip-link:focus {
  top: 12px;
  color: #fff;
  text-decoration: none;
}

/* ============ 渐显动效：仅在 JS 可用时隐藏，避免脚本失效导致内容永久不可见 ============ */
html.js .reveal-on-scroll {
  opacity: 0;
  transform: translateY(16px);
}

html.js .reveal-on-scroll.is-revealed {
  opacity: 1;
  transform: translateY(0);
}

/* ============ 深色背景上的按钮变体 ============ */
.btn-on-dark,
.item-6 .btn-on-dark {
  background: #fff;
  border-color: #fff;
  color: #065a47;
}

.btn-on-dark:hover:not(:disabled),
.item-6 .btn-on-dark:hover:not(:disabled) {
  background: #f0faf7;
  border-color: #f0faf7;
  color: #065a47;
}