/* ============================================
   Online Tools Website - Main Stylesheet
   Tech minimal, professional, responsive
   ============================================ */

/* CSS Variables */
:root {
  --color-primary: #2563eb;
  --color-primary-hover: #1d4ed8;
  --color-text: #1f2937;
  --color-text-muted: #6b7280;
  --color-bg: #ffffff;
  --color-bg-alt: #f9fafb;
  --color-card-bg: #f5f6f7;
  --color-border: #e5e7eb;
  --color-card-shadow: 0 1px 3px rgba(0, 0, 0, 0.08);
  --color-card-shadow-hover: 0 4px 12px rgba(0, 0, 0, 0.1);
  --font-sans: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, 'Helvetica Neue', Arial, sans-serif;
  --max-width: 1200px;
  --header-max-width: 1400px;
  --header-height: 64px;
  --radius: 8px;
  --transition: 0.2s ease;
  /* Main nav: all dropdowns (flat + flyouts) share link spacing */
  --nav-dd-panel-inset-y: 1rem;
  --nav-dd-gap-top: 0.08rem;
  --nav-dd-min-width: 11.25rem;
  --nav-dd-link-py: 0.45rem;
  --nav-dd-link-px: 0.5rem;
  --nav-dd-link-fs: 0.8125rem;
  --nav-dd-link-lh: 1.35;
  /* Calculators: category row padding (same rhythm as links) */
  --nav-dd-subcat-py: 0.5rem;
  --nav-dd-subcat-px: 0.48rem;
  --nav-dd-subcat-fs: 0.6875rem;
  --nav-dd-subcat-lh: 1.4;
}

/* Reset & Base */
*,
*::before,
*::after {
  box-sizing: border-box;
}

html {
  font-size: 16px;
  scroll-behavior: smooth;
}

body {
  margin: 0;
  padding: 0;
}

/* 主站正文样式不要套在 tools 子站上（Bootstrap / 各子站自己的 body） */
body:not(.tool-page):not(.image-tools-site):not(.video-tools-site):not(.pdf-tools-site) {
  font-family: var(--font-sans);
  color: var(--color-text);
  background: var(--color-bg);
  line-height: 1.6;
}

a {
  color: var(--color-primary);
  text-decoration: none;
  transition: color var(--transition);
}

a:hover {
  color: var(--color-primary-hover);
}

img {
  max-width: 100%;
  height: auto;
  display: block;
}

/* ========== Header & Navigation ========== */
.site-header {
  position: sticky;
  top: 0;
  z-index: 100;
  background: var(--color-bg);
  border-bottom: 1px solid var(--color-border);
  box-shadow: var(--color-card-shadow);
}

.site-header::before {
  content: '';
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  height: var(--header-height);
  background: var(--color-primary);
  z-index: 0;
}

.header-inner {
  max-width: var(--header-max-width);
  margin: 0 auto;
  padding: 0 2.5rem;
  display: flex;
  flex-direction: column;
  align-items: center;
  position: relative;
  z-index: 1;
}

.header-top {
  display: flex;
  align-items: center;
  justify-content: space-between;
  width: 100%;
  min-height: var(--header-height);
}

.header-top-right {
  display: flex;
  align-items: center;
  gap: 1rem;
  margin-left: auto;
}

.header-top-links {
  display: flex;
  align-items: center;
  gap: 1rem;
}

.header-top-links a {
  color: rgba(255, 255, 255, 0.95);
  font-weight: 500;
  font-size: 0.95rem;
}

.header-top-links a:hover {
  color: #fff;
}

.header-nav-wrap {
  width: 100%;
  display: flex;
  justify-content: center;
  border-top: 1px solid var(--color-border);
  padding: 0.75rem 0;
}

.logo a {
  font-size: 1.25rem;
  font-weight: 700;
  color: #fff;
}

.logo a:hover {
  color: rgba(255, 255, 255, 0.9);
}

/* Desktop Navigation — only the top bar row; nested .dropdown-menu must not be flex-row (same as Text Tools) */
.main-nav > ul {
  display: flex;
  list-style: none;
  margin: 0;
  padding: 0;
  gap: 2rem;
  flex-wrap: wrap;
  justify-content: center;
}

.main-nav > ul > li {
  position: relative;
}

.main-nav a {
  color: var(--color-text);
  font-weight: 500;
  font-size: 0.95rem;
}

.main-nav a:hover {
  color: var(--color-primary);
}

/* Dropdown menu */
.nav-dropdown .nav-trigger {
  display: flex;
  align-items: center;
  gap: 0.25rem;
}

.nav-dropdown .nav-trigger::after {
  content: '';
  display: inline-block;
  width: 0;
  height: 0;
  margin-left: 0.2em;
  border-left: 4px solid transparent;
  border-right: 4px solid transparent;
  border-top: 5px solid currentColor;
  vertical-align: middle;
}

.nav-dropdown .dropdown-menu {
  position: absolute;
  top: 100%;
  left: 50%;
  transform: translateX(-50%);
  min-width: var(--nav-dd-min-width);
  margin-top: var(--nav-dd-gap-top);
  padding: var(--nav-dd-panel-inset-y) 0;
  background: var(--color-bg);
  border: 1px solid var(--color-border);
  border-radius: var(--radius);
  box-shadow: var(--color-card-shadow-hover);
  list-style: none;
  opacity: 0;
  visibility: hidden;
  transition: opacity var(--transition), visibility var(--transition);
  z-index: 50;
}

.nav-dropdown .dropdown-menu > li {
  margin: 0;
  padding: 0;
  list-style: none;
}

.nav-dropdown:hover .dropdown-menu,
.nav-dropdown:focus-within .dropdown-menu {
  opacity: 1;
  visibility: visible;
}

/* Tool pages load Bootstrap: keep panels clickable (display + z-index) and force the same look as the homepage nav (Bootstrap padding/fonts/borders otherwise leak in). */
.site-header .nav-dropdown > .dropdown-menu,
.site-header .nav-dropdown--nested > .dropdown-menu.dropdown-menu--nested {
  display: block !important;
}

@media (min-width: 769px) {
  .site-header .nav-dropdown .dropdown-menu,
  .site-header .nav-dropdown--nested .dropdown-menu.dropdown-menu--nested {
    z-index: 1000 !important;
    position: absolute !important;
    top: 100% !important;
    left: 50% !important;
    right: auto !important;
    transform: translateX(-50%) !important;
    float: none !important;
    min-width: var(--nav-dd-min-width) !important;
    max-width: none !important;
    width: auto !important;
    margin: var(--nav-dd-gap-top) 0 0 !important;
    padding: var(--nav-dd-panel-inset-y) 0 !important;
    font-size: inherit !important;
    line-height: inherit !important;
    text-align: left !important;
    list-style: none !important;
    background: var(--color-bg) !important;
    background-color: var(--color-bg) !important;
    border: 1px solid var(--color-border) !important;
    border-radius: var(--radius) !important;
    box-shadow: var(--color-card-shadow-hover) !important;
    -webkit-background-clip: padding-box !important;
    background-clip: padding-box !important;
  }

  .site-header .nav-dropdown--nested .nav-submenu-label {
    padding: var(--nav-dd-subcat-py) 1.15rem var(--nav-dd-subcat-py) var(--nav-dd-subcat-px) !important;
    font-size: var(--nav-dd-subcat-fs) !important;
    font-weight: 700 !important;
    line-height: var(--nav-dd-subcat-lh) !important;
    letter-spacing: 0.04em !important;
    text-transform: uppercase !important;
    color: var(--color-text-muted, #64748b) !important;
    background: transparent !important;
    background-color: transparent !important;
    border: 0 !important;
  }
}

.site-header .nav-dropdown .dropdown-menu > li,
.site-header .nav-dropdown--nested .dropdown-menu--nested > li {
  margin: 0 !important;
  padding: 0 !important;
  list-style: none !important;
  float: none !important;
}

.site-header .nav-dropdown .dropdown-menu a[role='menuitem'],
.site-header .nav-dropdown--nested .dropdown-menu--nested a[role='menuitem'],
.site-header .nav-dropdown .dropdown-menu > li > a,
.site-header .nav-dropdown--nested .dropdown-menu--nested > li > a {
  display: block !important;
  padding: var(--nav-dd-link-py) var(--nav-dd-link-px) !important;
  font-size: var(--nav-dd-link-fs) !important;
  line-height: var(--nav-dd-link-lh) !important;
  font-weight: 500 !important;
  color: var(--color-text) !important;
  text-decoration: none !important;
  white-space: nowrap !important;
  font-family: var(--font-sans) !important;
  background: transparent !important;
  background-color: transparent !important;
  border: 0 !important;
  border-radius: 0 !important;
  clear: none !important;
  box-shadow: none !important;
}

.site-header .nav-dropdown .dropdown-menu a[role='menuitem']:hover,
.site-header .nav-dropdown--nested .dropdown-menu--nested a[role='menuitem']:hover,
.site-header .nav-dropdown .dropdown-menu > li > a:hover,
.site-header .nav-dropdown--nested .dropdown-menu--nested > li > a:hover {
  background: var(--color-bg-alt) !important;
  background-color: var(--color-bg-alt) !important;
  color: var(--color-primary) !important;
}

.dropdown-menu a {
  display: block;
  padding: var(--nav-dd-link-py) var(--nav-dd-link-px);
  font-size: var(--nav-dd-link-fs);
  line-height: var(--nav-dd-link-lh);
  color: var(--color-text);
  text-decoration: none;
  white-space: nowrap;
  /* Avoid extra leading from body line-height inheritance. */
  font-family: var(--font-sans);
}

.dropdown-menu a:hover {
  background: var(--color-bg-alt);
  color: var(--color-primary);
}

/* Same line height/alignment as shorter labels; avoids long category names wrapping under the chevron */
.nav-dropdown > .nav-trigger {
  white-space: nowrap;
}

/* Calculators: level-2 category + level-3 tools (flyout on desktop); links use same .dropdown-menu a as other nav */
.nav-dropdown--nested .dropdown-menu--nested {
  min-width: var(--nav-dd-min-width);
  padding: var(--nav-dd-panel-inset-y) 0;
  z-index: 100;
}

.nav-dropdown--nested .nav-submenu {
  position: relative;
  list-style: none;
  margin: 0;
  padding: 0;
  line-height: var(--nav-dd-link-lh);
}

.nav-dropdown--nested .nav-submenu-label {
  display: block;
  padding: var(--nav-dd-subcat-py) 1.15rem var(--nav-dd-subcat-py) var(--nav-dd-subcat-px);
  font-size: var(--nav-dd-subcat-fs);
  font-weight: 700;
  line-height: var(--nav-dd-subcat-lh);
  letter-spacing: 0.04em;
  text-transform: uppercase;
  color: var(--color-text-muted, #64748b);
  cursor: default;
  user-select: none;
}

.nav-dropdown--nested .nav-flyout {
  list-style: none;
  margin: 0;
  padding: 0;
}

.nav-dropdown--nested .nav-flyout > li {
  margin: 0;
  padding: 0;
}

@media (min-width: 769px) {
  .nav-dropdown--nested .nav-flyout {
    position: absolute;
    left: 100%;
    top: 0;
    margin-left: 2px;
    min-width: 15.5rem;
    max-height: none;
    overflow: visible;
    padding: var(--nav-dd-panel-inset-y) 0;
    background: var(--color-bg);
    border: 1px solid var(--color-border);
    border-radius: var(--radius);
    box-shadow: var(--color-card-shadow-hover);
    opacity: 0;
    visibility: hidden;
    transition: opacity var(--transition), visibility var(--transition);
    z-index: 110;
  }

  .nav-dropdown--nested .nav-submenu:hover .nav-flyout,
  .nav-dropdown--nested .nav-submenu:focus-within .nav-flyout {
    opacity: 1;
    visibility: visible;
  }

  .nav-dropdown--nested .nav-submenu-label {
    position: relative;
    padding-right: 1rem;
  }

  .nav-dropdown--nested .nav-submenu-label::after {
    content: '';
    position: absolute;
    right: 0.35rem;
    top: 50%;
    margin-top: -3px;
    border: 4px solid transparent;
    border-left-color: currentColor;
    opacity: 0.45;
    pointer-events: none;
  }

  .nav-dropdown--nested .nav-submenu:hover .nav-submenu-label,
  .nav-dropdown--nested .nav-submenu:focus-within .nav-submenu-label {
    background: var(--color-bg-alt);
    color: var(--color-primary);
  }

  .site-header .nav-dropdown--nested .nav-flyout {
    z-index: 1010 !important;
    position: absolute !important;
    left: 100% !important;
    top: 0 !important;
    right: auto !important;
    transform: none !important;
    margin-left: 2px !important;
    margin-top: 0 !important;
    min-width: 15.5rem !important;
    max-height: none !important;
    overflow: visible !important;
    padding: var(--nav-dd-panel-inset-y) 0 !important;
    background: var(--color-bg) !important;
    background-color: var(--color-bg) !important;
    border: 1px solid var(--color-border) !important;
    border-radius: var(--radius) !important;
    box-shadow: var(--color-card-shadow-hover) !important;
    list-style: none !important;
    float: none !important;
  }

  .site-header .nav-dropdown--nested .nav-flyout > li {
    margin: 0 !important;
    padding: 0 !important;
    float: none !important;
    list-style: none !important;
  }

  .site-header .nav-dropdown--nested .nav-flyout a[role='menuitem'],
  .site-header .nav-dropdown--nested .nav-flyout > li > a {
    display: block !important;
    padding: var(--nav-dd-link-py) var(--nav-dd-link-px) !important;
    font-size: var(--nav-dd-link-fs) !important;
    line-height: var(--nav-dd-link-lh) !important;
    font-weight: 500 !important;
    color: var(--color-text) !important;
    text-decoration: none !important;
    white-space: nowrap !important;
    font-family: var(--font-sans) !important;
    background: transparent !important;
    background-color: transparent !important;
    border: 0 !important;
    border-radius: 0 !important;
    box-shadow: none !important;
  }

  .site-header .nav-dropdown--nested .nav-flyout a[role='menuitem']:hover,
  .site-header .nav-dropdown--nested .nav-flyout > li > a:hover {
    background: var(--color-bg-alt) !important;
    background-color: var(--color-bg-alt) !important;
    color: var(--color-primary) !important;
  }

  .site-header .nav-dropdown--nested .nav-submenu:hover .nav-submenu-label,
  .site-header .nav-dropdown--nested .nav-submenu:focus-within .nav-submenu-label {
    background: var(--color-bg-alt) !important;
    color: var(--color-primary) !important;
  }
}

/* Mobile menu toggle */
.nav-toggle {
  display: none;
  background: none;
  border: none;
  cursor: pointer;
  padding: 0.5rem;
  font-size: 1.5rem;
  color: #fff;
}

@media (max-width: 768px) {
  .nav-toggle {
    display: block;
  }

  .header-nav-wrap {
    display: none;
    position: absolute;
    top: 100%;
    left: 0;
    right: 0;
    background: var(--color-bg);
    border-bottom: 1px solid var(--color-border);
  }

  .header-nav-wrap.is-open {
    display: flex;
  }

  .main-nav {
    width: 100%;
  }

  .main-nav > ul {
    flex-direction: column;
    padding: 0.65rem 0.85rem;
    gap: 0.25rem;
  }

  .main-nav a {
    display: block;
    padding: 0.45rem 0.5rem;
  }

  .nav-dropdown .dropdown-menu {
    position: static;
    transform: none;
    margin-top: 0;
    margin-left: 1rem;
    margin-bottom: 0.5rem;
    box-shadow: none;
    border: none;
    opacity: 1;
    visibility: visible;
    max-height: 0;
    overflow: hidden;
    padding: 0;
    transition: max-height 0.2s ease;
  }

  .nav-dropdown.is-open .dropdown-menu {
    max-height: 560px;
    padding: var(--nav-dd-panel-inset-y) 0;
  }

  .nav-dropdown .nav-trigger::after {
    transition: transform 0.2s ease;
  }

  .nav-dropdown.is-open .nav-trigger::after {
    transform: rotate(180deg);
  }

  .nav-dropdown--nested .nav-flyout {
    position: static;
    opacity: 1;
    visibility: visible;
    max-height: none;
    overflow: visible;
    margin-left: 0;
    padding: 0 0 0.1rem 0.35rem;
    border: none;
    box-shadow: none;
    background: transparent;
  }

  .nav-dropdown--nested .nav-submenu-label {
    padding: var(--nav-dd-subcat-py) 0.5rem;
    font-size: var(--nav-dd-subcat-fs);
    line-height: var(--nav-dd-subcat-lh);
    cursor: default;
  }

  .nav-dropdown--nested .nav-submenu-label::after {
    display: none;
  }

  .nav-dropdown--nested.is-open .dropdown-menu--nested {
    max-height: none;
    overflow-y: visible;
  }
}

/* ========== Hero Section (main site only — video tools SPA uses its own .hero in #app) ========== */
body:not(.tool-page):not(.video-tools-site):not(.pdf-tools-site) .hero {
  background: linear-gradient(180deg, var(--color-bg-alt) 0%, var(--color-bg) 100%);
  padding: 4rem 1.5rem;
  text-align: center;
}

body:not(.tool-page):not(.video-tools-site):not(.pdf-tools-site) .hero-inner {
  max-width: 720px;
  margin: 0 auto;
}

body:not(.tool-page):not(.video-tools-site):not(.pdf-tools-site) .hero h1 {
  font-size: 2.25rem;
  font-weight: 700;
  color: var(--color-text);
  margin: 0 0 1rem;
  line-height: 1.3;
}

body:not(.tool-page):not(.video-tools-site):not(.pdf-tools-site) .hero p {
  font-size: 1.125rem;
  color: var(--color-text-muted);
  margin: 0 0 2rem;
}

body:not(.tool-page):not(.image-tools-site):not(.video-tools-site):not(.pdf-tools-site) .btn {
  display: inline-block;
  padding: 0.75rem 1.5rem;
  font-size: 1rem;
  font-weight: 600;
  color: #fff;
  background: var(--color-primary);
  border: none;
  border-radius: var(--radius);
  cursor: pointer;
  transition: font-size var(--transition);
  text-decoration: none;
  user-select: none;
  -webkit-user-select: none;
  -moz-user-select: none;
  -ms-user-select: none;
}

/* 实心蓝按钮：始终白字，覆盖全局 a:hover */
body:not(.tool-page):not(.image-tools-site):not(.video-tools-site):not(.pdf-tools-site) a.btn:not(.btn-outline),
body:not(.tool-page):not(.image-tools-site):not(.video-tools-site):not(.pdf-tools-site) a.btn:not(.btn-outline):hover,
body:not(.tool-page):not(.image-tools-site):not(.video-tools-site):not(.pdf-tools-site) a.btn:not(.btn-outline):focus {
  color: #fff !important;
}

body:not(.tool-page):not(.image-tools-site):not(.video-tools-site):not(.pdf-tools-site) .btn:hover {
  font-size: 1.125rem;
}

/* 描边按钮：默认蓝字，悬停时蓝底白字 */
body:not(.tool-page):not(.image-tools-site):not(.video-tools-site):not(.pdf-tools-site) .btn-outline {
  background: transparent;
  border: 2px solid var(--color-primary);
  color: var(--color-primary);
}

body:not(.tool-page):not(.image-tools-site):not(.video-tools-site):not(.pdf-tools-site) a.btn-outline,
body:not(.tool-page):not(.image-tools-site):not(.video-tools-site):not(.pdf-tools-site) a.btn-outline:focus {
  color: var(--color-primary) !important;
}

body:not(.tool-page):not(.image-tools-site):not(.video-tools-site):not(.pdf-tools-site) a.btn-outline:hover {
  color: #fff !important;
}

body:not(.tool-page):not(.image-tools-site):not(.video-tools-site):not(.pdf-tools-site) .btn-outline:hover {
  background: var(--color-primary);
  color: #fff;
}

/* ========== Layout Container ========== */
body:not(.tool-page):not(.image-tools-site):not(.video-tools-site):not(.pdf-tools-site) .container {
  max-width: var(--max-width);
  margin: 0 auto;
  padding: 0 1.5rem;
}

body:not(.tool-page):not(.video-tools-site):not(.image-tools-site):not(.pdf-tools-site) .section {
  padding: 3rem 0;
}

body:not(.tool-page):not(.image-tools-site):not(.video-tools-site):not(.pdf-tools-site) .section-title {
  font-size: 1.5rem;
  font-weight: 700;
  margin: 0 0 1.5rem;
  text-align: center;
  color: var(--color-text);
}

/* ========== Category Cards (4 columns) ========== */
.category-grid {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 1.5rem;
}

body:not(.tool-page):not(.video-tools-site):not(.image-tools-site):not(.pdf-tools-site) .card {
  background: var(--color-card-bg);
  border: 1px solid var(--color-border);
  border-radius: var(--radius);
  padding: 1.5rem;
  box-shadow: var(--color-card-shadow);
  transition: box-shadow var(--transition), transform var(--transition);
  display: flex;
  flex-direction: column;
  align-items: center;
  text-align: center;
  text-decoration: none;
  color: inherit;
}

body:not(.tool-page):not(.video-tools-site):not(.image-tools-site):not(.pdf-tools-site) .card:hover {
  box-shadow: var(--color-card-shadow-hover);
  transform: translateY(-2px);
}

.card-icon {
  width: 80px;
  height: 80px;
  display: flex;
  align-items: center;
  justify-content: center;
  background: #fff;
  border-radius: 12px;
  box-shadow: 0 2px 8px rgba(0, 0, 0, 0.06);
  margin-bottom: 1rem;
  flex-shrink: 0;
}

.card-icon svg {
  width: 40px;
  height: 40px;
  color: var(--color-primary);
}

.card[data-icon-color="orange"] .card-icon svg { color: #ea580c; }
.card[data-icon-color="blue"] .card-icon svg { color: #2563eb; }
.card[data-icon-color="green"] .card-icon svg { color: #16a34a; }
.card[data-icon-color="purple"] .card-icon svg { color: #7c3aed; }
.card[data-icon-color="red"] .card-icon svg { color: #dc2626; }

.card h3 {
  font-size: 1.125rem;
  margin: 0 0 0.5rem;
}

.card p {
  font-size: 0.9rem;
  color: var(--color-text-muted);
  margin: 0;
}

.card-cta {
  display: block;
  margin-top: 0.75rem;
  font-weight: 500;
  color: var(--color-primary);
}

/* ========== Tool Cards ========== */
.tool-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(260px, 1fr));
  gap: 1.5rem;
}

.tool-card {
  background: var(--color-card-bg);
  border: 1px solid var(--color-border);
  border-radius: var(--radius);
  padding: 1.5rem;
  box-shadow: var(--color-card-shadow);
  transition: box-shadow var(--transition);
  display: flex;
  flex-direction: column;
  align-items: center;
  text-align: center;
  text-decoration: none;
  color: inherit;
}

.tool-card:hover {
  box-shadow: var(--color-card-shadow-hover);
}

.tool-card-icon {
  width: 56px;
  height: 56px;
  display: flex;
  align-items: center;
  justify-content: center;
  background: #fff;
  border-radius: 12px;
  box-shadow: 0 2px 8px rgba(0, 0, 0, 0.06);
  margin-bottom: 1rem;
  flex-shrink: 0;
}

.tool-card-icon svg {
  width: 28px;
  height: 28px;
  color: var(--tool-icon-color, var(--color-primary));
}

.tool-card[data-icon-color="orange"] .tool-card-icon svg { color: #ea580c; }
.tool-card[data-icon-color="blue"] .tool-card-icon svg { color: #2563eb; }
.tool-card[data-icon-color="green"] .tool-card-icon svg { color: #16a34a; }
.tool-card[data-icon-color="purple"] .tool-card-icon svg { color: #7c3aed; }
.tool-card[data-icon-color="red"] .tool-card-icon svg { color: #dc2626; }

.tool-card h3 {
  font-size: 1rem;
  font-weight: 500;
  margin: 0 0 0.5rem;
}

.tool-card p {
  font-size: 0.875rem;
  color: var(--color-text-muted);
  margin: 0;
}

/* ========== Home: all tools dashboard cards (reference UI) ========== */
.home-tools-section {
  background: #f5f7fa;
}

.home-tools-grid {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 1.125rem;
}

.tool-dash-card {
  background: #fff;
  border-radius: 10px;
  border: 1px solid #e8eaed;
  box-shadow: 0 1px 2px rgba(0, 0, 0, 0.04);
  padding: 0;
  overflow: hidden;
  text-decoration: none;
  color: inherit;
  transition: border-color var(--transition), box-shadow var(--transition);
  display: flex;
  flex-direction: column;
  min-height: 100%;
}

.tool-dash-card:hover {
  border-color: #1890ff;
  box-shadow:
    0 0 0 1px rgba(24, 144, 255, 0.2),
    0 2px 12px rgba(24, 144, 255, 0.08);
}

.tool-dash-card:focus-visible {
  outline: 2px solid var(--color-primary);
  outline-offset: 2px;
}

.tool-dash-card__header {
  display: flex;
  align-items: flex-start;
  gap: 0.75rem;
  padding: 1rem 1rem 0.875rem;
}

.tool-dash-card__icon {
  width: 40px;
  height: 40px;
  flex-shrink: 0;
  display: flex;
  align-items: center;
  justify-content: center;
  background: #f8fafc;
  border-radius: 8px;
  border: 1px solid #eef2f6;
}

.tool-dash-card__icon svg {
  width: 22px;
  height: 22px;
  color: var(--color-primary);
}

.tool-dash-card[data-icon-color="orange"] .tool-dash-card__icon svg { color: #ea580c; }
.tool-dash-card[data-icon-color="blue"] .tool-dash-card__icon svg { color: #2563eb; }
.tool-dash-card[data-icon-color="green"] .tool-dash-card__icon svg { color: #16a34a; }
.tool-dash-card[data-icon-color="purple"] .tool-dash-card__icon svg { color: #7c3aed; }
.tool-dash-card[data-icon-color="red"] .tool-dash-card__icon svg { color: #dc2626; }

.tool-dash-card__titles {
  min-width: 0;
  flex: 1;
}

.tool-dash-card__name {
  display: block;
  font-size: 1rem;
  font-weight: 600;
  color: #333;
  line-height: 1.35;
}

.tool-dash-card__cat {
  display: block;
  font-size: 0.75rem;
  color: #8c8c8c;
  margin-top: 0.25rem;
}

.tool-dash-card__divider {
  height: 1px;
  background: #f0f0f0;
  margin: 0 1rem;
  flex-shrink: 0;
}

.tool-dash-card__desc {
  margin: 0;
  padding: 0.75rem 1rem 1rem;
  font-size: 0.8125rem;
  color: #999;
  line-height: 1.5;
  display: -webkit-box;
  -webkit-line-clamp: 3;
  -webkit-box-orient: vertical;
  overflow: hidden;
  flex: 1;
}

/* ========== Why Choose Us ========== */
.features-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 2rem;
}

.feature-item {
  text-align: center;
}

.feature-item h3 {
  font-size: 1.125rem;
  margin: 0 0 0.5rem;
}

.feature-item p {
  font-size: 0.95rem;
  color: var(--color-text-muted);
  margin: 0;
}

@media (max-width: 768px) {
  .category-grid {
    grid-template-columns: repeat(2, 1fr);
  }

  .home-tools-grid {
    grid-template-columns: repeat(2, 1fr);
  }

  .features-grid {
    grid-template-columns: 1fr;
  }
}

@media (max-width: 480px) {
  .category-grid {
    grid-template-columns: 1fr;
  }

  .home-tools-grid {
    grid-template-columns: 1fr;
  }

  body:not(.tool-page):not(.video-tools-site):not(.pdf-tools-site) .hero h1 {
    font-size: 1.75rem;
  }
}

/* ========== Tool Page Styles ========== */
.tool-page main {
  max-width: 900px;
  margin: 0 auto;
  padding: 2rem 1.5rem;
}

.tool-page h1 {
  font-size: 1.875rem;
  margin: 0 0 1rem;
}

.tool-page h2 {
  font-size: 1.25rem;
  margin: 2rem 0 1rem;
  padding-top: 1rem;
  border-top: 1px solid var(--color-border);
}

.tool-page h3 {
  font-size: 1.0625rem;
  margin: 1.5rem 0 0.5rem;
}

.tool-page p {
  margin: 0 0 1rem;
  color: var(--color-text);
}

.tool-intro {
  font-size: 1.0625rem;
  line-height: 1.7;
}

.tool-link-wrap {
  margin-top: 1.5rem;
  margin-bottom: 0;
  display: flex;
  flex-wrap: wrap;
  gap: 0.75rem;
}

/* Tool interaction area */
.tool-area {
  background: var(--color-bg-alt);
  border: 1px solid var(--color-border);
  border-radius: var(--radius);
  padding: 1.5rem;
  margin: 1.5rem 0;
}

.tool-area textarea,
.tool-area input[type="text"] {
  width: 100%;
  padding: 0.75rem;
  font-family: inherit;
  font-size: 0.95rem;
  border: 1px solid var(--color-border);
  border-radius: var(--radius);
  resize: vertical;
}

.tool-area textarea {
  min-height: 120px;
}

.tool-buttons {
  display: flex;
  gap: 0.75rem;
  margin-top: 1rem;
  flex-wrap: wrap;
}

.tool-buttons .btn {
  padding: 0.5rem 1rem;
  font-size: 0.9rem;
}

/* Ad placeholder */
.ad-placeholder {
  min-height: 90px;
  background: var(--color-bg-alt);
  border: 1px dashed var(--color-border);
  border-radius: var(--radius);
  display: flex;
  align-items: center;
  justify-content: center;
  color: var(--color-text-muted);
  font-size: 0.875rem;
  margin: 1.5rem 0;
}

/* FAQ */
.faq-list {
  padding: 0;
  margin: 2rem 0;
}

.faq-item {
  margin-bottom: 1.5rem;
  padding-bottom: 1.5rem;
  border-bottom: 1px solid var(--color-border);
}

.faq-item:last-child {
  border-bottom: none;
  margin-bottom: 0;
  padding-bottom: 0;
}

.faq-item h2 {
  font-size: 1.0625rem;
  margin: 0 0 0.5rem;
  font-weight: 600;
}

.faq-item p {
  margin: 0;
  color: var(--color-text);
  line-height: 1.6;
}

/* Related tools */
.related-tools {
  display: flex;
  flex-wrap: wrap;
  gap: 0.75rem;
}

.related-tools a {
  display: inline-block;
  padding: 0.4rem 0.75rem;
  background: var(--color-bg-alt);
  border-radius: var(--radius);
  font-size: 0.9rem;
}

.related-tools a:hover {
  background: var(--color-border);
}

/* ========== Category Page ========== */
.category-intro {
  font-size: 1rem;
  color: var(--color-text-muted);
  margin-bottom: 2rem;
  max-width: 720px;
}

.category-subheading {
  font-size: 1.15rem;
  font-weight: 600;
  color: var(--color-text);
  margin: 2rem 0 1rem;
}

.category-intro + .category-subheading {
  margin-top: 0.25rem;
}

/* ========== Footer ========== */
.site-footer {
  background: var(--color-primary);
  border-top: 1px solid rgba(255, 255, 255, 0.2);
  padding: 2rem 1.5rem;
  margin-top: 3rem;
}

.footer-inner {
  max-width: var(--max-width);
  margin: 0 auto;
  text-align: center;
}

.footer-nav {
  display: flex;
  flex-wrap: wrap;
  justify-content: center;
  gap: 1rem;
  margin-bottom: 1rem;
}

.footer-nav a {
  color: rgba(255, 255, 255, 0.9);
  font-size: 0.9rem;
}

.footer-nav a:hover {
  color: #fff;
}

.footer-copy {
  font-size: 0.875rem;
  color: rgba(255, 255, 255, 0.85);
  margin: 0;
}

/* Code & Pre (tool pages) */
code, pre {
  font-family: 'Consolas', 'Monaco', 'Courier New', monospace;
  font-size: 0.9rem;
}

code {
  background: var(--color-bg-alt);
  padding: 0.2em 0.4em;
  border-radius: 4px;
}

pre {
  background: var(--color-bg-alt);
  padding: 1rem;
  border-radius: var(--radius);
  overflow-x: auto;
  margin: 0 0 1rem;
}

/* Video tools: style.css loads before SPA bundle — undo main site body; exclude .btn/.container (see above) */
body.video-tools-site {
  min-height: 100vh;
  display: flex;
  flex-direction: column;
  margin: 0;
  font-family: "Instrument Sans", system-ui, sans-serif;
  line-height: 1.55;
  color: var(--text, #e8edf7);
  background: radial-gradient(ellipse 100% 80% at 50% -30%, rgba(94, 234, 212, 0.12), transparent),
    radial-gradient(ellipse 60% 50% at 100% 50%, rgba(99, 102, 241, 0.08), transparent),
    var(--bg0, #070a12);
}

/* Video SPA: global `a` + Instrument Sans on :root — keep shell identical to other site pages */
body.video-tools-site .image-tools-nav-stack .site-header {
  font-family: var(--font-sans);
}

body.video-tools-site .site-header .header-top-links a {
  color: rgba(255, 255, 255, 0.95);
  text-decoration: none;
}

body.video-tools-site .site-header .header-top-links a:hover {
  color: #fff;
  text-decoration: none;
}

body.video-tools-site .site-header .main-nav > ul > li > a.nav-trigger {
  color: var(--color-text);
  font-weight: 500;
  font-size: 0.95rem;
  text-decoration: none;
}

body.video-tools-site .site-header .main-nav > ul > li > a.nav-trigger:hover {
  color: var(--color-primary);
  text-decoration: none;
}

body.video-tools-site .site-header .dropdown-menu a {
  color: var(--color-text);
  text-decoration: none;
}

body.video-tools-site .site-header .dropdown-menu a:hover {
  color: var(--color-primary);
  text-decoration: none;
}

/* Footer: use default .footer-nav (light links on blue bar); do not override */

/* Image tools: main style.css loads after Bootstrap/landing-page — restore original tool typography & colors */
body.image-tools-site {
  font-family:
    "Inter",
    system-ui,
    -apple-system,
    "Segoe UI",
    Roboto,
    "Helvetica Neue",
    Arial,
    sans-serif;
  font-size: 1rem;
  line-height: 1.5;
  color: #1e293b;
  background-color: #f8fafc;
}

body.image-tools-site h1,
body.image-tools-site h2,
body.image-tools-site h3,
body.image-tools-site h4,
body.image-tools-site h5,
body.image-tools-site h6 {
  font-family: "Lato", "Helvetica Neue", Helvetica, Arial, sans-serif;
  font-weight: 700;
}

body.image-tools-site .lead {
  font-size: 1.125rem;
  font-weight: 400;
}

body.image-tools-site #mainContent a:not(.btn):not(.btn-close) {
  color: var(--bs-link-color, #0d6efd);
}

body.image-tools-site #mainContent a:not(.btn):not(.btn-close):hover {
  color: var(--bs-link-hover-color, #0a58ca);
}

/* ========== Image / Video / PDF tools: main header + dark subnav (flush) ========== */
body.image-tools-site .image-tools-nav-stack,
body.video-tools-site .image-tools-nav-stack,
body.pdf-tools-site .image-tools-nav-stack {
  position: sticky;
  top: 0;
  z-index: 200;
}

body.image-tools-site .image-tools-nav-stack .site-header,
body.video-tools-site .image-tools-nav-stack .site-header,
body.pdf-tools-site .image-tools-nav-stack .site-header {
  position: relative;
  top: auto;
  margin-bottom: 0;
  border-bottom: none;
  box-shadow: none;
}

body.pdf-tools-site .image-tools-nav-stack #pdf-subnav-mount {
  margin: 0;
  padding: 0;
  display: block;
}

body.image-tools-site .image-tools-subnav,
body.video-tools-site .image-tools-subnav {
  margin: 0;
  padding: 0;
  background-color: #343a40 !important;
  border-top: none;
}

body.image-tools-site .image-tools-subnav .container-fluid,
body.video-tools-site .image-tools-subnav .container-fluid {
  padding-top: 0.35rem;
  padding-bottom: 0.35rem;
}

body.image-tools-site .image-tools-subnav__link,
body.video-tools-site .image-tools-subnav__link {
  display: inline-block;
  color: #fff !important;
  text-decoration: none !important;
  font-size: 0.95rem;
  font-weight: 500;
  padding: 0.35rem 0.65rem;
  border-radius: 0.375rem;
  line-height: 1.3;
  transition: background-color 0.15s ease;
}

body.image-tools-site .image-tools-subnav__link:hover,
body.video-tools-site .image-tools-subnav__link:hover {
  background: rgba(255, 255, 255, 0.15);
  color: #fff !important;
}

body.image-tools-site .image-tools-subnav__link.is-active,
body.video-tools-site .image-tools-subnav__link.is-active {
  background-color: #0d6efd;
  color: #fff !important;
}

/* Image / Video / PDF subsite: pin main site footer to bottom */
body.image-tools-site.d-flex.flex-column .site-footer,
body.video-tools-site .site-footer,
body.pdf-tools-site .site-footer {
  margin-top: auto;
}

/* Video SPA: hide built-in top bar & footer (main site chrome replaces them) */
body.video-tools-site #app .top,
body.video-tools-site #app .footer {
  display: none !important;
}

body.video-tools-site #app {
  flex: 1 0 auto;
}

body.video-tools-site .video-tools-subnav-inner {
  padding: 0.25rem 1rem;
  max-width: 100%;
}

body.video-tools-site .video-tools-subnav__row {
  display: flex;
  flex-wrap: wrap;
  gap: 0.35rem 0.5rem;
  align-items: center;
  justify-content: center;
  width: 100%;
}

/* PDF tools: shell layout + main nav (same as video SPA overrides) */
body.pdf-tools-site {
  min-height: 100vh;
  display: flex;
  flex-direction: column;
  margin: 0;
}

body.pdf-tools-site .image-tools-nav-stack .site-header {
  font-family: var(--font-sans);
}

body.pdf-tools-site .site-header .header-top-links a {
  color: rgba(255, 255, 255, 0.95);
  text-decoration: none;
}

body.pdf-tools-site .site-header .header-top-links a:hover {
  color: #fff;
  text-decoration: none;
}

body.pdf-tools-site .site-header .main-nav > ul > li > a.nav-trigger {
  color: var(--color-text);
  font-weight: 500;
  font-size: 0.95rem;
  text-decoration: none;
}

body.pdf-tools-site .site-header .main-nav > ul > li > a.nav-trigger:hover {
  color: var(--color-primary);
  text-decoration: none;
}

body.pdf-tools-site .site-header .dropdown-menu a {
  color: var(--color-text);
  text-decoration: none;
}

body.pdf-tools-site .site-header .dropdown-menu a:hover {
  color: var(--color-primary);
  text-decoration: none;
}

body.pdf-tools-site #root {
  flex: 1 0 auto;
  display: flex;
  flex-direction: column;
  min-height: 0;
}

/* React shell (.layout) must participate in #root flex; avoid 100vh-only min-height or tool area can collapse */
body.pdf-tools-site #root .layout {
  flex: 1 1 auto;
  min-height: 0;
}