:root {
  --bg-body: #f4f6f9;
  --bg-card: #ffffff;
  --bg-panel: #f8fafc;
  --text-primary: #1e293b;
  --text-secondary: #64748b;
  --border-color: #e2e8f0;
  
  --accent-blue: #2563eb;
  --accent-purple: #8b5cf6;
  --green: #10b981;
  --green-dark: #047857;
  
  --summary-bg: #f0fdf4;
  --summary-border: #bbf7d0;
}

body.dark-mode {
  --bg-body: #0f172a;
  --bg-card: #1e293b;
  --bg-panel: #0f172a;
  --text-primary: #f8fafc;
  --text-secondary: #94a3b8;
  --border-color: #334155;
  
  --summary-bg: #064e3b;
  --summary-border: #047857;
}

* { 
  margin: 0; 
  padding: 0; 
  box-sizing: border-box; 
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, sans-serif; 
}

body { 
  background-color: var(--bg-body); 
  color: var(--text-primary); 
  min-height: 100vh; 
  display: flex; 
  flex-direction: column; 
  top: 0 !important;
  transition: background-color 0.2s ease, color 0.2s ease;
}

main { 
  max-width: 1100px; 
  margin: 2rem auto; 
  padding: 0 1rem; 
  flex: 1; 
  width: 100%; 
  position: relative;
  z-index: 1;
}

.goog-te-banner-frame,
.goog-te-gadget,
.skiptranslate {
  display: none !important;
}

header { 
  background: var(--bg-card); 
  border-bottom: 1px solid var(--border-color); 
  padding: 1rem 2rem; 
  position: relative;
  z-index: 100;
}

.header-container { 
  max-width: 1100px; 
  margin: 0 auto; 
  display: flex; 
  justify-content: space-between; 
  align-items: center; 
}

.logo { 
  font-size: 1.25rem; 
  font-weight: 800; 
  color: var(--text-primary); 
  text-decoration: none; 
  letter-spacing: -0.5px; 
}

.nav-menu { 
  display: flex; 
  gap: 0.5rem; 
}

.nav-item { 
  text-decoration: none; 
  padding: 0.4rem 0.8rem; 
  border-radius: 8px; 
  font-size: 0.85rem; 
  font-weight: 600; 
  color: var(--text-secondary); 
  transition: 0.2s; 
}

.nav-item.active, .nav-item:hover { 
  background: var(--bg-panel); 
  color: var(--accent-blue); 
}

.header-actions {
  display: flex;
  align-items: center;
  gap: 8px;
}

.theme-toggle-btn,
.lang-dropdown-btn {
  height: 38px;
  background: var(--bg-card);
  border: 1px solid var(--border-color);
  border-radius: 8px;
  padding: 0 10px;
  cursor: pointer;
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 6px;
  color: var(--text-primary);
  font-size: 0.9rem;
  transition: all 0.2s ease;
  box-shadow: 0 1px 2px rgba(0, 0, 0, 0.05);
}

.theme-toggle-btn:hover,
.lang-dropdown-btn:hover {
  background-color: var(--bg-panel);
  border-color: #cbd5e1;
}

.lang-dropdown {
  position: relative;
  display: inline-block;
}

.lang-dropdown-btn img {
  width: 20px;
  height: 14px;
  border-radius: 2px;
  object-fit: cover;
}

.dropdown-arrow {
  font-size: 0.65rem;
  color: var(--text-secondary);
}

.lang-dropdown-content {
  display: none;
  position: absolute;
  right: 0;
  top: calc(100% + 6px);
  background-color: var(--bg-card);
  width: 170px;
  max-height: 280px;
  overflow-y: auto;
  box-shadow: 0 10px 25px rgba(0, 0, 0, 0.2);
  border-radius: 8px;
  border: 1px solid var(--border-color);
  z-index: 1000;
  padding: 6px 0;
}

.lang-dropdown-content.show {
  display: flex !important;
  flex-direction: column !important;
}

.lang-dropdown-content button {
  width: 100%;
  background: transparent;
  border: none;
  padding: 8px 14px;
  text-align: left;
  font-size: 0.85rem;
  color: var(--text-primary);
  cursor: pointer;
  display: flex !important;
  align-items: center;
  gap: 10px;
  transition: background-color 0.15s ease;
  white-space: nowrap;
}

.lang-dropdown-content button:hover {
  background-color: var(--bg-panel);
}

.lang-dropdown-content button img {
  width: 20px;
  height: 14px;
  border-radius: 2px;
  object-fit: cover;
  flex-shrink: 0;
}

.calc-container { 
  background: var(--bg-card); 
  border: 1px solid var(--border-color); 
  border-radius: 16px; 
  display: grid; 
  grid-template-columns: 1fr 1fr; 
  gap: 2rem; 
  padding: 2rem; 
  box-shadow: 0 4px 20px -5px rgba(0,0,0,0.05); 
}

@media (max-width: 850px) {
  .calc-container { grid-template-columns: 1fr; }
}

.calc-tabs { 
  display: flex; 
  background: var(--bg-panel); 
  padding: 0.25rem; 
  border-radius: 10px; 
  margin-bottom: 1.5rem; 
  border: 1px solid var(--border-color); 
}

.tab-btn { 
  flex: 1; 
  border: none; 
  padding: 0.6rem; 
  border-radius: 8px; 
  font-weight: 600; 
  font-size: 0.85rem; 
  cursor: pointer; 
  background: transparent; 
  color: var(--text-secondary); 
  transition: 0.2s; 
}

.tab-btn.active { 
  background: var(--bg-card); 
  color: var(--accent-blue); 
  box-shadow: 0 2px 4px rgba(0,0,0,0.05); 
}

.calc-header h1 { font-size: 1.3rem; font-weight: 700; margin-bottom: 0.25rem; color: var(--text-primary); }
.calc-header p { font-size: 0.85rem; color: var(--text-secondary); margin-bottom: 1rem; }

.form-group { margin-bottom: 1rem; }
.label-box { display: flex; justify-content: space-between; font-size: 0.85rem; font-weight: 600; margin-bottom: 0.3rem; color: var(--text-primary); }
.form-group input[type="number"] { 
  width: 100%; 
  padding: 0.65rem; 
  border: 1px solid var(--border-color); 
  border-radius: 8px; 
  font-size: 0.9rem; 
  outline: none; 
  background: var(--bg-card);
  color: var(--text-primary);
}
.form-group input[type="range"] { width: 100%; accent-color: var(--accent-blue); cursor: pointer; margin-top: 0.3rem; }

.quick-buttons {
  display: flex;
  gap: 0.5rem;
  flex-wrap: wrap;
  margin-top: 0.5rem;
}

.btn-quick {
  flex: 1;
  min-width: 100px;
  background: var(--bg-panel);
  border: 1px solid var(--border-color);
  border-radius: 8px;
  padding: 0.5rem 0.75rem;
  font-size: 0.8rem;
  font-weight: 600;
  color: var(--accent-blue);
  cursor: pointer;
  transition: all 0.2s ease;
}

.btn-quick:hover {
  background: var(--bg-card);
  border-color: var(--accent-blue);
}

.btn-quick.btn-reset {
  color: var(--text-secondary);
  background: var(--bg-card);
}

.result-panel { 
  background: var(--bg-panel); 
  border-radius: 12px; 
  padding: 1.5rem; 
  display: flex; 
  flex-direction: column; 
  justify-content: space-between; 
  border: 1px solid var(--border-color); 
}

.result-title { font-size: 0.9rem; font-weight: 700; color: var(--text-secondary); margin-bottom: 0.5rem; }
.main-val { font-size: 2rem; font-weight: 800; color: var(--green); margin-bottom: 1rem; }
.main-val span { font-size: 0.85rem; display: block; color: var(--text-secondary); font-weight: 500; }

.stat-row { display: flex; justify-content: space-between; padding: 0.6rem 0; border-bottom: 1px solid var(--border-color); font-size: 0.875rem; }
.stat-row:last-child { border-bottom: none; }
.stat-val { font-weight: 600; color: var(--text-primary); }

.time-effect-card { 
  background: var(--summary-bg); 
  border: 1px solid var(--summary-border); 
  border-radius: 8px; 
  padding: 0.8rem; 
  margin-top: 1rem; 
  font-size: 0.8rem; 
  color: var(--text-primary); 
  line-height: 1.4; 
}

.summary-card {
  background: var(--summary-bg);
  border: 1px solid var(--summary-border);
  border-left: 4px solid var(--accent-blue) !important;
  border-radius: 8px;
  padding: 1rem;
  margin-top: 1.25rem;
  font-size: 0.875rem;
  color: var(--text-primary);
  line-height: 1.5;
  box-shadow: 0 1px 3px rgba(0, 0, 0, 0.05);
}

.section-box { 
  margin-top: 1.5rem; 
  background: var(--bg-card); 
  border: 1px solid var(--border-color); 
  border-radius: 12px; 
  padding: 1.5rem; 
}

.section-title { font-size: 1.1rem; font-weight: 700; margin-bottom: 1rem; color: var(--text-primary); }

.table-wrapper {
  width: 100%;
  overflow-x: auto;
}

.scenario-table { 
  width: 100%; 
  border-collapse: collapse; 
  font-size: 0.85rem; 
  text-align: left; 
  white-space: nowrap;
}

.scenario-table th, .scenario-table td { 
  padding: 0.65rem 0.5rem; 
  border-bottom: 1px solid var(--border-color); 
  color: var(--text-primary);
}

.scenarios-grid { display: grid; grid-template-columns: repeat(auto-fit, minmax(200px, 1fr)); gap: 1rem; margin-top: 1rem; }
.sc-card { 
  background: var(--bg-panel); 
  border: 1px solid var(--border-color); 
  border-radius: 10px; 
  padding: 1rem; 
  border-top: 4px solid var(--accent-blue); 
}

footer { 
  text-align: center; 
  padding: 1.5rem; 
  font-size: 0.85rem; 
  color: var(--text-secondary); 
  border-top: 1px solid var(--border-color); 
  background: var(--bg-card); 
  margin-top: 2rem; 
}

.goog-te-banner-frame, 
#goog-gt-tt, 
.goog-te-balloon-frame {
  display: none !important;
}

body {
  top: 0px !important;
  position: static !important;
}

.btn-quick.btn-share {
  -webkit-appearance: none;
  appearance: none;
  -webkit-tap-highlight-color: transparent;
  
  background-color: #eff6ff;
  color: #1d4ed8;
  border: 1px solid #bfdbfe;
  font-weight: 600;
  transition: all 0.2s ease-in-out;
}

.btn-quick.btn-share:hover,
.btn-quick.btn-share:active {
  background-color: #2563eb;
  color: #ffffff;
  border-color: #2563eb;
  transform: translateY(-1px);
}

body.dark-mode .btn-quick.btn-share {
  background-color: rgba(30, 58, 138, 0.4);
  color: #93c5fd;
  border-color: #1e40af;
}

body.dark-mode .btn-quick.btn-share:hover,
body.dark-mode .btn-quick.btn-share:active {
  background-color: #2563eb;
  color: #ffffff;
  border-color: #2563eb;
}

.nav-dropdown {
  position: relative;
  display: inline-block;
}

.dropdown-toggle {
  background: transparent;
  border: none;
  cursor: pointer;
  display: flex;
  align-items: center;
  gap: 4px;
}

.dropdown-toggle .arrow {
  font-size: 0.65rem;
  transition: transform 0.2s;
}

.mega-menu {
  display: none;
  position: absolute;
  top: calc(100% + 10px);
  left: 50%;
  transform: translateX(-50%);
  width: 820px;
  max-width: 90vw;
  background: var(--bg-card);
  border: 1px solid var(--border-color);
  border-radius: 12px;
  box-shadow: 0 15px 35px rgba(0, 0, 0, 0.15);
  padding: 1.5rem;
  z-index: 1000;
}

.mega-menu.show {
  display: block !important;
}

.mega-menu-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(170px, 1fr));
  gap: 1.25rem;
}

.col-title {
  font-size: 0.75rem;
  font-weight: 800;
  color: var(--text-secondary);
  border-bottom: 2px solid var(--border-color);
  padding-bottom: 6px;
  margin-bottom: 10px;
  letter-spacing: 0.5px;
}

.mega-col ul {
  list-style: none;
}

.mega-col li {
  margin-bottom: 8px;
  font-size: 0.825rem;
}

.mega-col a {
  color: var(--text-primary);
  text-decoration: none;
  transition: color 0.15s ease;
}

.mega-col a:hover,
.mega-col a.link-highlight {
  color: var(--accent-blue);
  font-weight: 600;
}

.badge-soon {
  color: var(--text-secondary);
  opacity: 0.65;
}

.hero-section {
  text-align: center;
  margin-bottom: 2.5rem;
}

.category-tag {
  font-size: 0.75rem;
  font-weight: 800;
  color: #d97706;
  letter-spacing: 1px;
}

.hero-title {
  font-size: 2rem;
  font-weight: 800;
  margin: 0.4rem 0;
  color: var(--text-primary);
}

.hero-subtitle {
  font-size: 0.95rem;
  color: var(--text-secondary);
}

.category-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
  gap: 1.5rem;
}

.cat-card {
  background: var(--bg-card);
  border: 1px solid var(--border-color);
  border-radius: 16px;
  padding: 1.5rem;
  display: flex;
  flex-direction: column;
  justify-content: space-between;
  box-shadow: 0 4px 15px rgba(0, 0, 0, 0.03);
  transition: transform 0.2s ease, box-shadow 0.2s ease;
}

.cat-card:hover {
  transform: translateY(-3px);
  box-shadow: 0 8px 25px rgba(0, 0, 0, 0.08);
}

.border-green { border-top: 4px solid #10b981; }
.border-blue { border-top: 4px solid #2563eb; }
.border-amber { border-top: 4px solid #f59e0b; }
.border-purple { border-top: 4px solid #8b5cf6; }

.cat-card-header {
  display: flex;
  align-items: center;
  gap: 12px;
  margin-bottom: 1.25rem;
}

.cat-icon {
  width: 44px;
  height: 44px;
  border-radius: 10px;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 1.3rem;
}

.bg-green { background-color: rgba(16, 185, 129, 0.12); }
.bg-blue { background-color: rgba(37, 99, 235, 0.12); }
.bg-amber { background-color: rgba(245, 158, 11, 0.12); }
.bg-purple { background-color: rgba(139, 92, 246, 0.12); }

.cat-card-header h3 {
  font-size: 1.05rem;
  font-weight: 700;
  color: var(--text-primary);
}

.tool-count {
  font-size: 0.75rem;
  color: var(--text-secondary);
}

.cat-list {
  list-style: none;
  margin-bottom: 1.5rem;
}

.cat-list li {
  padding: 8px 0;
  font-size: 0.875rem;
  border-bottom: 1px dashed var(--border-color);
  display: flex;
  justify-content: space-between;
  align-items: center;
}

.cat-list li:last-child {
  border-bottom: none;
}

.cat-list a {
  color: var(--text-primary);
  text-decoration: none;
}

.cat-list a:hover {
  color: var(--accent-blue);
}

.item-disabled {
  color: var(--text-secondary);
  opacity: 0.7;
}

.tag-soon {
  font-size: 0.68rem;
  background: var(--bg-panel);
  padding: 2px 6px;
  border-radius: 4px;
  border: 1px solid var(--border-color);
}

.btn-cat {
  width: 100%;
  padding: 0.65rem;
  border-radius: 8px;
  font-size: 0.85rem;
  font-weight: 600;
  text-align: center;
  cursor: pointer;
  text-decoration: none;
  border: 1px solid transparent;
  transition: all 0.2s ease;
}

.btn-green {
  background: rgba(16, 185, 129, 0.1);
  color: #047857;
  border-color: rgba(16, 185, 129, 0.3);
}
.btn-green:hover { background: #10b981; color: #fff; }

.btn-cat:disabled {
  background: var(--bg-panel);
  color: var(--text-secondary);
  border-color: var(--border-color);
  cursor: not-allowed;
  opacity: 0.6;
}

@media (max-width: 850px) {
  .mega-menu {
    left: 0;
    transform: none;
    width: 100%;
    position: fixed;
    top: 60px;
    height: calc(100vh - 60px);
    overflow-y: auto;
  }
}

.form-group select {
  width: 100%;
  padding: 0.75rem;
  border-radius: 8px;
  border: 1px solid var(--border-color);
  background-color: var(--bg-card);
  color: var(--text-primary);
  font-size: 0.95rem;
  font-weight: 600;
  cursor: pointer;
  outline: none;
  transition: border-color 0.2s ease, background-color 0.2s ease;
}

.form-group select:focus {
  border-color: var(--accent-color, #2563eb);
}

.form-group input:disabled {
  background-color: rgba(0, 0, 0, 0.04);
  border-color: var(--border-color);
  color: var(--text-primary);
  font-weight: 700;
  opacity: 0.75;
  cursor: not-allowed;
}

body.dark-mode .form-group input:disabled {
  background-color: rgba(255, 255, 255, 0.06);
}

.calc-divider {
  border: 0;
  border-top: 1px solid var(--border-color);
  margin: 1.5rem 0;
}