/* ===== CONTAINER ===== */
.container {
  width: 100%;
  max-width: 1280px;
  margin: 0 auto;
  padding: 0 var(--space-6);
}
@media (max-width: 640px) { .container { padding: 0 var(--space-4); } }

/* ===== HEADER ===== */
#site-header {
  position: sticky;
  top: 0;
  z-index: 100;
  background: var(--c-card);
  border-bottom: 1px solid var(--c-border);
  box-shadow: var(--shadow-sm);
  height: var(--header-h);
  display: flex;
  align-items: center;
  transition: background var(--transition);
}

.header-inner {
  display: flex;
  align-items: center;
  gap: var(--space-6);
  height: 100%;
  width: 100%;
}

.logo {
  display: flex;
  align-items: center;
  gap: var(--space-3);
  text-decoration: none;
  flex-shrink: 0;
}

.logo-icon {
  width: 36px;
  height: 36px;
  background: var(--c-primary);
  border-radius: var(--r-md);
  display: flex;
  align-items: center;
  justify-content: center;
  color: white;
  font-weight: 800;
  font-size: 1rem;
}

.logo-text {
  font-weight: 800;
  font-size: 1.125rem;
  color: var(--c-text);
  letter-spacing: -0.02em;
}

.logo-text span { color: var(--c-primary); }

.header-nav {
  display: flex;
  align-items: center;
  gap: var(--space-1);
  flex: 1;
}

.nav-link {
  display: flex;
  align-items: center;
  gap: var(--space-2);
  padding: var(--space-2) var(--space-3);
  border-radius: var(--r-sm);
  font-size: 0.9rem;
  font-weight: 500;
  color: var(--c-text3);
  transition: all var(--transition);
  white-space: nowrap;
}
.nav-link:hover, .nav-link.active {
  color: var(--c-primary);
  background: var(--c-primary-l);
}

/* Desktop nav hidden on mobile — mobile-nav handles navigation */
@media (max-width: 768px) {
  .header-nav { display: none; }
  .header-inner { gap: var(--space-3); }
}

/* Compact header on very small screens */
@media (max-width: 400px) {
  .logo-text { display: none; }
  #lang-code { display: none; }
  .lang-btn { padding: var(--space-2); }
}

.header-actions {
  display: flex;
  align-items: center;
  gap: var(--space-2);
  margin-left: auto;
}

/* Language Selector */
.lang-selector {
  position: relative;
}

.lang-btn {
  display: flex;
  align-items: center;
  gap: var(--space-2);
  padding: var(--space-2) var(--space-3);
  background: var(--c-bg2);
  border: 1px solid var(--c-border);
  border-radius: var(--r-full);
  font-size: 0.85rem;
  font-weight: 500;
  color: var(--c-text2);
  cursor: pointer;
  transition: all var(--transition);
}
.lang-btn:hover { background: var(--c-bg3); border-color: var(--c-border2); }

.lang-dropdown {
  position: absolute;
  top: calc(100% + 8px);
  right: 0;
  background: var(--c-card);
  border: 1px solid var(--c-border);
  border-radius: var(--r-lg);
  box-shadow: var(--shadow-xl);
  padding: var(--space-2);
  min-width: 200px;
  z-index: 200;
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: var(--space-1);
  opacity: 0;
  visibility: hidden;
  transform: translateY(-8px);
  transition: all var(--transition);
}
.lang-dropdown.open {
  opacity: 1;
  visibility: visible;
  transform: translateY(0);
}

.lang-option {
  display: flex;
  align-items: center;
  gap: var(--space-2);
  padding: var(--space-2) var(--space-3);
  border-radius: var(--r-sm);
  font-size: 0.85rem;
  color: var(--c-text2);
  cursor: pointer;
  border: none;
  background: none;
  width: 100%;
  text-align: left;
  transition: all var(--transition);
}
.lang-option:hover { background: var(--c-bg2); color: var(--c-primary); }
.lang-option.active { background: var(--c-primary-l); color: var(--c-primary); font-weight: 600; }
.lang-flag { font-size: 1.1rem; }

/* Theme Toggle */
.theme-btn {
  width: 40px;
  height: 40px;
  border-radius: var(--r-full);
  border: 1px solid var(--c-border);
  background: var(--c-bg2);
  cursor: pointer;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 1.1rem;
  transition: all var(--transition);
  color: var(--c-text2);
}
.theme-btn:hover { background: var(--c-bg3); border-color: var(--c-border2); }

/* Mobile Menu */
.mobile-menu-btn {
  display: none;
  width: 40px;
  height: 40px;
  border-radius: var(--r-sm);
  border: 1px solid var(--c-border);
  background: var(--c-bg2);
  cursor: pointer;
  align-items: center;
  justify-content: center;
  flex-direction: column;
  gap: 5px;
  transition: all var(--transition);
}
@media (max-width: 768px) { .mobile-menu-btn { display: flex; } }

.mobile-menu-btn span {
  display: block;
  width: 20px;
  height: 2px;
  background: var(--c-text2);
  border-radius: 2px;
  transition: all var(--transition);
}

.mobile-nav {
  display: none;
  position: fixed;
  top: var(--header-h);
  left: 0;
  right: 0;
  bottom: 0;
  background: var(--c-card);
  z-index: 99;
  padding: var(--space-6);
  overflow-y: auto;
}
.mobile-nav.open { display: block; }

.mobile-nav-link {
  display: block;
  padding: var(--space-4);
  font-size: 1.1rem;
  font-weight: 500;
  color: var(--c-text);
  border-bottom: 1px solid var(--c-border);
  text-decoration: none;
}
.mobile-nav-link:hover { color: var(--c-primary); }

/* ===== HERO / PAGE BANNER ===== */
.page-hero {
  background: linear-gradient(135deg, var(--c-primary) 0%, #1E40AF 100%);
  color: white;
  padding: var(--space-12) 0;
  text-align: center;
}
.page-hero h1 { color: white; margin-bottom: var(--space-4); }
.page-hero p { color: rgba(255,255,255,0.85); font-size: 1.125rem; max-width: 600px; margin: 0 auto; }
@media (max-width: 640px) {
  .page-hero { padding: var(--space-8) 0; }
  .page-hero p { font-size: 1rem; }
}

.calc-hero {
  padding: var(--space-8) 0 var(--space-6);
}
.calc-hero .breadcrumb {
  display: flex;
  align-items: center;
  gap: var(--space-2);
  margin-bottom: var(--space-4);
  font-size: 0.875rem;
  color: var(--c-text3);
}
.calc-hero .breadcrumb a { color: var(--c-text3); }
.calc-hero .breadcrumb a:hover { color: var(--c-primary); }
.calc-hero h1 { margin-bottom: var(--space-3); }
.calc-hero p { font-size: 1.0625rem; max-width: 640px; }

/* ===== CALCULATOR LAYOUT ===== */
.calc-layout {
  display: grid;
  grid-template-columns: 420px 1fr;
  gap: var(--space-6);
  padding-bottom: var(--space-12);
}
@media (max-width: 1024px) {
  .calc-layout { grid-template-columns: 1fr; }
}

.calc-panel-left { display: flex; flex-direction: column; gap: var(--space-6); }
.calc-panel-right { display: flex; flex-direction: column; gap: var(--space-6); }

/* ===== FOOTER ===== */
#site-footer {
  background: var(--c-bg2);
  border-top: 1px solid var(--c-border);
  padding: var(--space-10) 0 var(--space-6);
  margin-top: auto;
}

.footer-grid {
  display: grid;
  grid-template-columns: 2fr 1fr 1fr 1fr;
  gap: var(--space-8);
  margin-bottom: var(--space-10);
}
@media (max-width: 768px) {
  .footer-grid { grid-template-columns: 1fr 1fr; gap: var(--space-6); }
}
@media (max-width: 480px) {
  .footer-grid { grid-template-columns: 1fr; }
}

.footer-brand p { font-size: 0.9rem; color: var(--c-text3); margin-top: var(--space-3); }

.footer-col h4 {
  font-size: 0.875rem;
  font-weight: 700;
  color: var(--c-text);
  text-transform: uppercase;
  letter-spacing: 0.06em;
  margin-bottom: var(--space-4);
}

.footer-col ul { list-style: none; }
.footer-col ul li { margin-bottom: var(--space-2); }
.footer-col ul li a {
  font-size: 0.9rem;
  color: var(--c-text3);
  transition: color var(--transition);
}
.footer-col ul li a:hover { color: var(--c-primary); }

.footer-bottom {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding-top: var(--space-6);
  border-top: 1px solid var(--c-border);
  font-size: 0.875rem;
  color: var(--c-text3);
  flex-wrap: wrap;
  gap: var(--space-4);
}
@media (max-width: 480px) {
  .footer-bottom { flex-direction: column; align-items: flex-start; gap: var(--space-2); }
}

/* ===== HOME GRID ===== */
.calc-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(280px, 1fr));
  gap: var(--space-5);
  padding: var(--space-10) 0;
}
@media (max-width: 480px) {
  .calc-grid { grid-template-columns: 1fr; gap: var(--space-4); padding: var(--space-6) 0; }
}

/* ===== SECTION HEADING ===== */
.section-header {
  text-align: center;
  margin-bottom: var(--space-8);
}
.section-header h2 { margin-bottom: var(--space-3); }
.section-header p { color: var(--c-text3); font-size: 1.0625rem; }

.section-label {
  display: inline-block;
  background: var(--c-primary-l);
  color: var(--c-primary);
  font-size: 0.8rem;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.08em;
  padding: var(--space-1) var(--space-3);
  border-radius: var(--r-full);
  margin-bottom: var(--space-3);
}