/**
 * 全站共享视觉：大气首页 + 清爽工具页。
 * 浅色编辑工具站；禁止紫渐变；token 驱动 chrome / 卡片 / 工具壳。
 */
:root {
  --bg: #eef1f5;
  --bg-hero: #0c1222;
  --bg-hero-mid: #152238;
  --bg-elevated: #ffffff;
  --surface: #ffffff;
  --surface-muted: #f7f8fa;
  --border: #e6e8ee;
  --border-strong: #d1d5db;
  --text: #0b1220;
  --muted: #5b6577;
  --accent: #0a6ebd;
  --accent-hover: #085a9b;
  --accent-soft: rgba(10, 110, 189, 0.1);
  --accent-on-dark: #7ec8ff;
  --radius: 16px;
  --radius-sm: 10px;
  --shadow: 0 12px 40px rgba(15, 23, 42, 0.08);
  --shadow-sm: 0 2px 8px rgba(15, 23, 42, 0.04);
  --header-h: 60px;
  --sidebar-w: 248px;
  --content-max: 880px;
  --home-max: 1120px;
  --font: "Outfit", "IBM Plex Sans", "Segoe UI", "Helvetica Neue", Arial, sans-serif;
  --font-mono: ui-monospace, SFMono-Regular, Menlo, Consolas, monospace;
}

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

html,
body {
  height: 100%;
  margin: 0;
  font-family: var(--font);
  color: var(--text);
  background: var(--bg);
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}

a {
  color: var(--accent);
  text-decoration: none;
}
a:hover {
  color: var(--accent-hover);
}

:focus-visible {
  outline: 2px solid rgba(10, 110, 189, 0.4);
  outline-offset: 3px;
}

/* —— Layout chrome —— */
body {
  min-height: 100vh;
  padding-top: var(--header-h);
  box-sizing: border-box;
}

/* 工具页：整页更白、更干净 */
body.is-tool-page {
  background: #fafbfc;
}

.layout {
  display: flex;
  min-height: calc(100vh - var(--header-h));
}

#sidebar {
  width: var(--sidebar-w);
  transition: margin-left 0.2s ease;
  position: sticky;
  top: var(--header-h);
  height: calc(100vh - var(--header-h));
  overflow-x: hidden;
  overflow-y: auto;
  background: #ffffff;
  border-right: 1px solid var(--border);
  z-index: 1020;
  padding: 1.15rem 0.75rem !important;
  /* 默认隐藏滚动条，避免侧栏出现粗系统条；仍可用滚轮/触控板滚动 */
  scrollbar-width: none;
  -ms-overflow-style: none;
}

#sidebar::-webkit-scrollbar {
  width: 0;
  height: 0;
}

/* 悬停时显示极细滚动条，提示可滚动且不抢视觉 */
#sidebar:hover {
  scrollbar-width: thin;
  scrollbar-color: rgba(148, 163, 184, 0.55) transparent;
}

#sidebar:hover::-webkit-scrollbar {
  width: 4px;
  height: 0;
}

#sidebar:hover::-webkit-scrollbar-thumb {
  background: rgba(148, 163, 184, 0.55);
  border-radius: 999px;
}

#sidebar:hover::-webkit-scrollbar-track {
  background: transparent;
}

#sidebar.bg-light,
#sidebar.border-end {
  background: #ffffff !important;
  border-color: var(--border) !important;
}

#sidebar .sidebar-title {
  font-size: 0.68rem;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  color: #94a3b8;
  font-weight: 600;
  margin: 0 0 0.75rem 0.5rem;
}

#sidebar .list-group-item {
  display: flex;
  align-items: flex-start;
  gap: 0.55rem;
  border: 0;
  border-radius: var(--radius-sm);
  margin-bottom: 1px;
  padding: 0.55rem 0.7rem;
  color: #334155;
  background: transparent;
  font-size: 0.9rem;
  font-weight: 500;
}

#sidebar .sidebar-tool-logo {
  width: 20px;
  height: 20px;
  border-radius: 5px;
  flex-shrink: 0;
  margin-top: 0.1rem;
}

#sidebar .sidebar-tool-label {
  line-height: 1.35;
}

#sidebar .list-group-item:hover {
  background: var(--accent-soft);
  color: var(--accent);
}

#sidebar .list-group-item.active,
#sidebar .list-group-item[aria-current='true'] {
  background: var(--accent-soft);
  color: var(--accent);
  font-weight: 650;
}

#content {
  flex: 1;
  transition: margin-left 0.2s ease;
  max-width: 100%;
}

body.is-home-page #content.p-4 {
  padding: 0 !important;
  max-width: none;
}

body.is-tool-page #content {
  max-width: calc(var(--content-max) + 4rem);
  margin-inline: auto;
}

body.is-tool-page #content.p-4 {
  padding: 2rem 1.75rem 3.5rem !important;
}

/* 未改 markup 的工具页：抬高首屏 H1 / 摘要 */
body.is-tool-page #content > div:first-child > h1.h4 {
  font-size: clamp(1.65rem, 3vw, 2.15rem);
  font-weight: 700;
  letter-spacing: -0.035em;
  line-height: 1.15;
  margin-bottom: 0.55rem;
}
body.is-tool-page #content > div:first-child > p.text-muted {
  font-size: 1.05rem;
  max-width: var(--content-max);
  line-height: 1.6;
  color: var(--muted) !important;
}

.sidebar-collapsed #sidebar {
  margin-left: calc(-1 * var(--sidebar-w));
}
.sidebar-collapsed #content {
  margin-left: 0;
}

@media (max-width: 767.98px) {
  #sidebar {
    position: fixed;
    z-index: 1020;
    top: var(--header-h);
    bottom: 0;
    height: auto;
  }
  .sidebar-collapsed #sidebar,
  .sidebar-mobile-collapsed #sidebar {
    margin-left: calc(-1 * var(--sidebar-w));
  }
  #content {
    margin-left: 0;
  }
  body.is-tool-page #content.p-4 {
    padding: 1.25rem 1rem 2.5rem !important;
  }
}

@media (min-width: 768px) {
  .navbar {
    min-height: var(--header-h);
  }
  .navbar .container-fluid {
    align-items: center;
  }
  .navbar .d-flex {
    align-items: center;
    gap: 0.5rem;
    flex-wrap: nowrap;
  }
  .navbar-brand {
    white-space: nowrap;
  }
}

/* —— Navbar：更轻 —— */
.navbar.site-navbar,
.navbar.navbar-light {
  background: rgba(255, 255, 255, 0.86) !important;
  backdrop-filter: blur(14px) saturate(1.2);
  -webkit-backdrop-filter: blur(14px) saturate(1.2);
  border-bottom: 1px solid rgba(15, 23, 42, 0.06) !important;
  box-shadow: none;
}

.navbar .navbar-brand {
  display: inline-flex;
  align-items: center;
  gap: 0.55rem;
  font-weight: 700;
  letter-spacing: -0.03em;
  font-size: 1.1rem;
  color: var(--text) !important;
}

.navbar .navbar-brand-logo {
  width: 28px;
  height: 28px;
  border-radius: 7px;
  flex-shrink: 0;
}

.navbar .navbar-brand-text {
  line-height: 1.1;
}

.navbar .nav-link {
  color: #64748b !important;
  font-weight: 500;
  font-size: 0.925rem;
  padding-inline: 0.85rem !important;
}
.navbar .nav-link:hover {
  color: var(--text) !important;
}

.navbar .btn-outline-secondary {
  border-color: transparent;
  color: #475569;
  border-radius: 999px;
  background: #f1f5f9;
  padding-inline: 0.85rem;
}
.navbar .btn-outline-secondary:hover {
  background: #e2e8f0;
  color: var(--text);
}

/* —— Buttons —— */
.btn {
  border-radius: 999px;
  font-weight: 600;
  letter-spacing: -0.01em;
}

/* 按钮组保持方圆角，避免 pill 挤在一组里难看 */
.btn-group > .btn,
.btn-group > .btn-check + .btn {
  border-radius: var(--radius-sm) !important;
}

.btn-primary {
  background: var(--accent) !important;
  border-color: var(--accent) !important;
  color: #fff !important;
  box-shadow: 0 6px 20px rgba(10, 110, 189, 0.28);
  padding-inline: 1.25rem;
}
.btn-primary:hover,
.btn-primary:focus {
  background: var(--accent-hover) !important;
  border-color: var(--accent-hover) !important;
  color: #fff !important;
  box-shadow: 0 8px 24px rgba(10, 110, 189, 0.34);
}

.btn-outline-primary {
  color: var(--accent) !important;
  border-color: rgba(10, 110, 189, 0.28) !important;
  background: transparent !important;
  padding-inline: 1.15rem;
}
.btn-outline-primary:hover {
  background: var(--accent-soft) !important;
  color: var(--accent-hover) !important;
}

.btn-lg,
.home-hero-actions .btn {
  padding: 0.75rem 1.45rem;
  font-size: 1.02rem;
}

/* —— Cards —— */
.card.tool-entry-card,
.card {
  background: var(--surface);
  border: 1px solid rgba(15, 23, 42, 0.06);
  border-radius: var(--radius);
  box-shadow: var(--shadow-sm);
}

.card.tool-entry-card {
  transition: transform 0.2s ease, border-color 0.2s ease, box-shadow 0.2s ease;
}
.card.tool-entry-card:hover {
  border-color: rgba(10, 110, 189, 0.28);
  box-shadow: var(--shadow);
  transform: translateY(-2px);
}

.card.tool-entry-card .card-body {
  padding: 1.35rem 1.35rem 1.25rem;
}

.tool-card-head {
  display: flex;
  align-items: flex-start;
  gap: 0.7rem;
  margin-bottom: 0.65rem;
}

.tool-card-logo {
  width: 36px;
  height: 36px;
  border-radius: 9px;
  flex-shrink: 0;
}

.card.tool-entry-card .tool-card-head .card-title {
  line-height: 1.3;
}

.tool-related-list {
  list-style: none;
  padding-left: 0;
}

.tool-related-item {
  margin-bottom: 0.45rem;
}

.tool-related-item a {
  display: inline-flex;
  align-items: center;
  gap: 0.45rem;
}

.tool-related-logo {
  width: 18px;
  height: 18px;
  border-radius: 4px;
  flex-shrink: 0;
}

.card .card-title {
  font-weight: 700;
  letter-spacing: -0.02em;
  color: var(--text);
  margin-bottom: 0.55rem;
}

.card .card-text {
  color: var(--muted);
  line-height: 1.5;
}

/* —— Footer —— */
footer.site-footer,
footer.bg-light {
  background: transparent !important;
  border-top: 1px solid var(--border) !important;
  color: var(--muted);
  padding: 1.5rem 0 !important;
}

/* ========== HOME：大气首屏 ========== */
.home-wrap {
  width: 100%;
}

.home-hero {
  position: relative;
  overflow: hidden;
  color: #f8fafc;
  background:
    radial-gradient(ellipse 80% 70% at 15% 20%, rgba(56, 140, 200, 0.35), transparent 55%),
    radial-gradient(ellipse 60% 50% at 90% 10%, rgba(45, 180, 160, 0.18), transparent 50%),
    linear-gradient(160deg, var(--bg-hero) 0%, var(--bg-hero-mid) 55%, #1a2740 100%);
  padding: clamp(3.5rem, 9vw, 7rem) clamp(1.25rem, 4vw, 2.5rem) clamp(3rem, 7vw, 5.5rem);
  margin-bottom: 0;
  border-bottom: 0;
  animation: homeHeroIn 0.7s ease both;
}

.home-hero::after {
  content: '';
  position: absolute;
  inset: auto 0 0 0;
  height: 72px;
  background: linear-gradient(to bottom, transparent, var(--bg));
  pointer-events: none;
}

.home-hero-inner {
  position: relative;
  z-index: 1;
  max-width: var(--home-max);
  margin: 0 auto;
}

.home-hero-brand {
  font-size: clamp(2.6rem, 7vw, 4.5rem);
  font-weight: 750;
  letter-spacing: -0.045em;
  line-height: 1.02;
  margin: 0 0 1.1rem;
  color: #ffffff;
  max-width: 14ch;
  text-wrap: balance;
  animation: homeFadeUp 0.75s 0.08s ease both;
}

.home-hero-lead {
  font-size: clamp(1.1rem, 2vw, 1.3rem);
  color: rgba(226, 232, 240, 0.88);
  max-width: 34rem;
  margin: 0 0 1.75rem;
  line-height: 1.55;
  font-weight: 400;
  animation: homeFadeUp 0.75s 0.16s ease both;
}

.home-hero-actions {
  display: flex;
  flex-wrap: wrap;
  gap: 0.75rem;
  animation: homeFadeUp 0.75s 0.24s ease both;
}

.home-hero-actions .btn-primary {
  background: #ffffff !important;
  border-color: #ffffff !important;
  color: var(--bg-hero) !important;
  box-shadow: 0 10px 30px rgba(0, 0, 0, 0.25);
}
.home-hero-actions .btn-primary:hover {
  background: #f1f5f9 !important;
  color: var(--bg-hero) !important;
}

.home-hero-actions .btn-outline-primary {
  color: #ffffff !important;
  border-color: rgba(255, 255, 255, 0.35) !important;
  background: rgba(255, 255, 255, 0.06) !important;
}
.home-hero-actions .btn-outline-primary:hover {
  background: rgba(255, 255, 255, 0.14) !important;
  color: #ffffff !important;
}

.home-main {
  max-width: var(--home-max);
  margin: 0 auto;
  padding: 0.5rem clamp(1.25rem, 4vw, 2.5rem) 4rem;
}

.home-why {
  display: grid;
  grid-template-columns: 1fr;
  gap: 1rem;
  margin: -1.5rem 0 2.75rem;
  position: relative;
  z-index: 2;
}

@media (min-width: 768px) {
  .home-why {
    grid-template-columns: repeat(3, 1fr);
    gap: 1.15rem;
  }
}

.home-why-item {
  padding: 1.35rem 1.4rem;
  border-radius: var(--radius);
  border: 1px solid rgba(15, 23, 42, 0.06);
  background: var(--surface);
  box-shadow: var(--shadow);
}

.home-why-item h3 {
  font-size: 1.05rem;
  font-weight: 700;
  letter-spacing: -0.02em;
  margin: 0 0 0.45rem;
  color: var(--text);
}

.home-why-item p {
  margin: 0;
  font-size: 0.95rem;
  color: var(--muted);
  line-height: 1.5;
}

.home-section-head {
  display: flex;
  justify-content: space-between;
  align-items: baseline;
  gap: 1rem;
  margin-bottom: 1.25rem;
}

.home-section-head h2 {
  font-size: clamp(1.35rem, 2.5vw, 1.65rem);
  font-weight: 750;
  letter-spacing: -0.03em;
  margin: 0;
}

.home-cat {
  margin-bottom: 2.25rem;
  padding: 1.6rem 1.5rem 1.7rem;
  border-radius: calc(var(--radius) + 4px);
  border: 1px solid rgba(15, 23, 42, 0.06);
  background: var(--surface);
  box-shadow: var(--shadow-sm);
}

.home-cat-label {
  display: inline-block;
  font-size: 0.72rem;
  font-weight: 700;
  letter-spacing: 0.07em;
  text-transform: uppercase;
  color: var(--accent);
  background: var(--accent-soft);
  border-radius: 999px;
  padding: 0.3rem 0.75rem;
  margin-bottom: 0.55rem;
}

.home-cat h3 {
  font-size: 1.2rem;
  font-weight: 700;
  letter-spacing: -0.02em;
  margin: 0 0 0.4rem;
}

.home-cat .home-cat-blurb {
  font-size: 0.95rem;
  color: var(--muted);
  margin: 0 0 1.25rem;
  max-width: 40rem;
}

@keyframes homeHeroIn {
  from {
    opacity: 0;
  }
  to {
    opacity: 1;
  }
}

@keyframes homeFadeUp {
  from {
    opacity: 0;
    transform: translateY(14px);
  }
  to {
    opacity: 1;
    transform: translateY(0);
  }
}

@media (prefers-reduced-motion: reduce) {
  .home-hero,
  .home-hero-brand,
  .home-hero-lead,
  .home-hero-actions,
  .card.tool-entry-card {
    animation: none !important;
    transition: none !important;
  }
}

/* ========== TOOL：清爽壳 ========== */
.tool-hero {
  margin-bottom: 1.75rem;
  padding-bottom: 0.25rem;
}

.tool-title {
  font-size: clamp(1.75rem, 3.2vw, 2.35rem);
  font-weight: 750;
  letter-spacing: -0.04em;
  line-height: 1.12;
  margin: 0 0 0.65rem;
  color: var(--text);
  max-width: var(--content-max);
  text-wrap: balance;
}

.tool-lead {
  font-size: 1.08rem;
  color: var(--muted);
  margin: 0;
  max-width: var(--content-max);
  line-height: 1.6;
  font-weight: 400;
}

/* 轻面板：少边框，多留白 — 接近对标站「标题+输入+主按钮」 */
.tool-panel {
  background: #ffffff;
  border: 1px solid rgba(15, 23, 42, 0.06);
  border-radius: calc(var(--radius) + 2px);
  padding: 1.5rem 1.5rem 1.6rem;
  box-shadow: var(--shadow-sm);
  margin-bottom: 2.5rem;
  max-width: var(--content-max);
  width: 100%;
}

.tool-panel .tools-bar {
  gap: 0.55rem;
  margin-bottom: 1rem !important;
}

.tool-panel .btn-primary {
  min-width: 7rem;
}

.tool-panel .form-label {
  font-weight: 600;
  font-size: 0.9rem;
  color: #334155;
  margin-bottom: 0.4rem;
}

.tool-panel .alert {
  border-radius: var(--radius-sm);
  border: 0;
}

/* IG / FAQ：更疏、更淡 */
#content section.tool-section > h2,
#content section > h2.h5,
#content #faq h2,
#content #how h2,
#content #rules h2,
#content #formula h2,
#content #example h2,
#content #use-cases h2,
#content #references h2,
#content #related h2,
#content #share h2,
#content #feedback h2 {
  font-size: 1.2rem;
  font-weight: 700;
  letter-spacing: -0.025em;
  color: var(--text);
  margin-bottom: 0.75rem;
}

#content section.mt-4,
#content section.tool-section {
  margin-top: 2.5rem !important;
  padding-top: 0.25rem;
  max-width: var(--content-max);
  width: 100%;
}

#content section.tool-section p,
#content section.tool-section li,
#content #faq p {
  line-height: 1.65;
}

/* 分享 / 反馈：上下单列堆叠，与工具正文同宽 */
.tool-module-grid {
  display: flex;
  flex-direction: column;
  gap: 1.25rem;
  margin-top: 2.5rem;
  max-width: var(--content-max);
  width: 100%;
}

/* 各计算器页内联卡片：统一正文宽度 */
body.is-tool-page .tool-card,
body.is-tool-page .bmi-card,
body.is-tool-page .pct-card,
body.is-tool-page .grad-card,
body.is-tool-page .mr-card,
body.is-tool-page .sf-card {
  max-width: var(--content-max);
  width: 100%;
  margin-left: 0;
  margin-right: 0;
}

.tool-module {
  padding: 1.25rem 1.3rem;
  border: 1px solid var(--border);
  border-radius: var(--radius-sm);
  background: #f8fafc;
}

.tool-module > h2 {
  font-size: 1.1rem;
  font-weight: 700;
  letter-spacing: -0.02em;
  color: var(--text);
  margin-bottom: 0.5rem;
}

.tool-module-actions {
  display: flex;
  flex-wrap: wrap;
  gap: 0.5rem;
}

.tool-share-networks {
  display: flex;
  flex-wrap: wrap;
  gap: 0.45rem;
  margin-bottom: 0.85rem;
}

.tool-share-net {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  min-height: 2rem;
  padding: 0.3rem 0.7rem;
  border-radius: var(--radius-sm);
  border: 1px solid var(--border);
  background: #fff;
  color: #334155 !important;
  font-size: 0.8rem;
  font-weight: 600;
  line-height: 1.2;
  text-decoration: none !important;
  transition: border-color 0.15s ease, background 0.15s ease, color 0.15s ease;
}

.tool-share-net:hover {
  border-color: rgba(10, 110, 189, 0.35);
  background: var(--accent-soft);
  color: var(--accent) !important;
}

.tool-share-url {
  word-break: break-all;
  font-family: var(--font-mono);
  font-size: 0.78rem;
}

/* 仿写信界面 */
.tool-mail-compose {
  display: flex;
  flex-direction: column;
  gap: 0.65rem;
  padding: 0.85rem 0.95rem;
  border: 1px solid var(--border);
  border-radius: var(--radius-sm);
  background: #fff;
}

.tool-mail-row {
  display: grid;
  grid-template-columns: 4.5rem minmax(0, 1fr);
  gap: 0.55rem;
  align-items: center;
}

.tool-mail-row--body {
  align-items: start;
}

.tool-mail-label {
  margin: 0;
  font-size: 0.8rem;
  font-weight: 650;
  color: #64748b;
  padding-top: 0.35rem;
}

.tool-mail-input,
.tool-mail-body {
  border-color: var(--border);
  border-radius: var(--radius-sm);
}

.tool-mail-input[readonly] {
  background: #f1f5f9;
  color: #334155;
}

.tool-mail-body {
  min-height: 9rem;
  resize: vertical;
  font-size: 0.9rem;
  line-height: 1.5;
}

.tool-mail-actions {
  margin-top: 0.25rem;
  padding-top: 0.65rem;
  border-top: 1px solid var(--border);
}

@media (max-width: 520px) {
  .tool-mail-row {
    grid-template-columns: 1fr;
    gap: 0.25rem;
  }
  .tool-mail-label {
    padding-top: 0;
  }
}

/* Form helpers */
.input-lg {
  padding: 0.9rem 1.05rem;
  border-radius: var(--radius-sm);
  border: 1px solid var(--border);
  background: #fff;
}

.result {
  padding: 1.1rem 1.15rem;
  border-radius: var(--radius-sm);
  background: #f8fafc;
  border: 1px solid var(--border);
}

.tool-card {
  max-width: var(--content-max);
  width: 100%;
}

pre,
textarea.form-control,
#outText,
#previewOut {
  font-family: var(--font-mono);
}

.form-control,
.form-select {
  border-color: var(--border);
  border-radius: var(--radius-sm);
  padding: 0.65rem 0.85rem;
}
.form-control:focus,
.form-select:focus {
  border-color: rgba(10, 110, 189, 0.45);
  box-shadow: 0 0 0 0.2rem rgba(10, 110, 189, 0.1);
}

.badge.text-bg-secondary {
  background: var(--accent-soft) !important;
  color: var(--accent) !important;
  font-weight: 650;
}

@media (max-width: 640px) {
  .home-hero-brand {
    max-width: none;
  }
  .tool-panel {
    padding: 1.1rem;
  }
  .tool-title {
    max-width: none;
  }
}