/* ===== CSS Custom Properties ===== */
:root {
  --accent: #6366f1;
  --accent-hover: #4f46e5;
  --accent-light: rgba(99, 102, 241, 0.1);
  --hero-gradient: linear-gradient(135deg, #6366f1 0%, #8b5cf6 50%, #a78bfa 100%);
  --card-radius: 1rem;
  --transition-fast: 0.2s ease;
  --transition-normal: 0.3s ease;
  --navbar-blur: blur(12px);
}

/* ===== Base ===== */
html {
  font-size: 14px;
  position: relative;
  min-height: 100%;
  scroll-behavior: smooth;
}

@media (min-width: 768px) {
  html {
    font-size: 16px;
  }
}

body {
  margin-bottom: 60px;
  padding-top: 76px;
  font-family: system-ui, -apple-system, "Segoe UI", Roboto, "Helvetica Neue", Arial, sans-serif;
}

/* ===== Focus States ===== */
.btn:focus, .btn:active:focus, .btn-link.nav-link:focus, .form-control:focus, .form-check-input:focus {
  box-shadow: 0 0 0 0.1rem white, 0 0 0 0.25rem var(--accent);
}

/* ===== Glass-morphism Navbar ===== */
.navbar-glass {
  background: rgba(255, 255, 255, 0.8);
  backdrop-filter: var(--navbar-blur);
  -webkit-backdrop-filter: var(--navbar-blur);
  border-bottom: 1px solid rgba(0, 0, 0, 0.06);
  box-shadow: 0 1px 3px rgba(0, 0, 0, 0.04);
  transition: background var(--transition-normal), box-shadow var(--transition-normal);
}

[data-bs-theme="dark"] .navbar-glass {
  background: rgba(30, 30, 40, 0.85);
  border-bottom-color: rgba(255, 255, 255, 0.06);
}

.brand-icon {
  font-size: 1.5rem;
}

.brand-text {
  background: var(--hero-gradient);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
  font-weight: 800;
  letter-spacing: -0.5px;
}

.navbar .nav-link {
  font-weight: 500;
  font-size: 0.9rem;
  padding: 0.5rem 0.85rem !important;
  border-radius: 0.5rem;
  transition: background var(--transition-fast), color var(--transition-fast);
}

.navbar .nav-link:hover {
  background: var(--accent-light);
  color: var(--accent) !important;
}

.navbar .dropdown-menu {
  border: none;
  border-radius: 0.75rem;
  box-shadow: 0 10px 40px rgba(0, 0, 0, 0.1), 0 2px 10px rgba(0, 0, 0, 0.06);
  padding: 0.5rem;
  animation: dropdownFadeIn 0.2s ease;
}

@keyframes dropdownFadeIn {
  from { opacity: 0; transform: translateY(-8px); }
  to   { opacity: 1; transform: translateY(0); }
}

.navbar .dropdown-item {
  border-radius: 0.5rem;
  padding: 0.45rem 0.85rem;
  font-size: 0.88rem;
  transition: background var(--transition-fast);
}

.navbar .dropdown-item:hover {
  background: var(--accent-light);
  color: var(--accent);
}

/* Desktop dropdown on hover */
@media (min-width: 992px) {
  .navbar .nav-item.dropdown:hover .dropdown-menu {
    display: block;
    margin-top: 0;
  }

  .navbar .dropdown-toggle::after {
    transition: transform var(--transition-fast);
  }

  .navbar .nav-item.dropdown:hover .dropdown-toggle::after {
    transform: rotate(180deg);
  }

  .navbar .nav-item.dropdown:last-child .dropdown-menu,
  .navbar .nav-item.dropdown:nth-last-child(2) .dropdown-menu,
  .navbar .nav-item.dropdown:nth-last-child(3) .dropdown-menu {
    right: 0;
    left: auto;
  }
}

/* ===== Hero Section ===== */
.hero-section {
  background: var(--hero-gradient);
  color: #fff;
  border-radius: 1.5rem;
  padding: 3.5rem 2rem;
  margin-bottom: 2rem;
  position: relative;
  overflow: hidden;
}

.hero-section::before {
  content: "";
  position: absolute;
  inset: 0;
  background: radial-gradient(circle at 20% 80%, rgba(255,255,255,0.15) 0%, transparent 50%),
              radial-gradient(circle at 80% 20%, rgba(255,255,255,0.1) 0%, transparent 50%);
  pointer-events: none;
}

.hero-section h1 {
  font-weight: 800;
  letter-spacing: -1px;
  font-size: clamp(1.8rem, 4vw, 3rem);
  text-shadow: 0 2px 10px rgba(0,0,0,0.1);
}

.hero-section .lead {
  font-size: clamp(1rem, 2vw, 1.25rem);
  opacity: 0.95;
}

.hero-section .text-muted-hero {
  color: rgba(255, 255, 255, 0.8) !important;
}

/* ===== Search Bar ===== */
.search-wrapper .form-control {
  border-radius: 3rem;
  padding: 0.8rem 1.5rem;
  border: 2px solid transparent;
  background: var(--bs-body-bg);
  box-shadow: 0 4px 20px rgba(0, 0, 0, 0.08);
  transition: border-color var(--transition-fast), box-shadow var(--transition-fast);
}

.search-wrapper .form-control:focus {
  border-color: var(--accent);
  box-shadow: 0 4px 20px rgba(99, 102, 241, 0.15);
}

.search-wrapper .btn {
  border-radius: 3rem;
  padding: 0.8rem 2rem;
  background: var(--accent);
  border-color: var(--accent);
  font-weight: 600;
}

.search-wrapper .btn:hover {
  background: var(--accent-hover);
  border-color: var(--accent-hover);
}

/* ===== Category Section ===== */
.category-heading {
  font-weight: 700;
  font-size: 1.35rem;
  display: flex;
  align-items: center;
  gap: 0.5rem;
}

.category-heading::after {
  content: "";
  flex: 1;
  height: 2px;
  background: linear-gradient(to right, var(--accent-light), transparent);
  margin-left: 0.75rem;
}

/* ===== Tool Cards ===== */
.tool-card {
  border: 1px solid rgba(0, 0, 0, 0.06);
  border-radius: var(--card-radius);
  transition: transform var(--transition-normal), box-shadow var(--transition-normal), border-color var(--transition-normal);
  overflow: hidden;
  background: var(--bs-body-bg);
}

.tool-card:hover {
  transform: translateY(-6px);
  box-shadow: 0 12px 40px rgba(99, 102, 241, 0.12), 0 4px 12px rgba(0, 0, 0, 0.06);
  border-color: var(--accent);
}

[data-bs-theme="dark"] .tool-card {
  border-color: rgba(255, 255, 255, 0.08);
}

[data-bs-theme="dark"] .tool-card:hover {
  border-color: var(--accent);
  box-shadow: 0 12px 40px rgba(99, 102, 241, 0.2), 0 4px 12px rgba(0, 0, 0, 0.3);
}

.tool-card .card-body {
  text-align: start;
  padding: 1.25rem;
}

.tool-card .card-title {
  font-weight: 700;
  font-size: 1rem;
  margin-bottom: 0.4rem;
}

.tool-card .card-text {
  font-size: 0.875rem;
  color: var(--bs-secondary-color);
  line-height: 1.5;
}

.tool-card .btn-tool {
  background: var(--accent-light);
  color: var(--accent);
  border: none;
  font-weight: 600;
  font-size: 0.85rem;
  border-radius: 0.5rem;
  padding: 0.45rem 1rem;
  transition: background var(--transition-fast), color var(--transition-fast);
}

.tool-card .btn-tool:hover {
  background: var(--accent);
  color: #fff;
}

/* ===== Drag-and-drop area ===== */
#drop-zone {
  border: 2px dashed var(--accent);
  border-radius: 0.75rem;
  padding: 30px;
  text-align: center;
  color: var(--accent);
  margin-bottom: 20px;
  transition: background var(--transition-fast);
}

#drop-zone.drag-over {
  background: var(--accent-light);
}

/* ===== Preview area ===== */
#preview-area {
  border: 1px solid var(--bs-border-color);
  border-radius: 0.5rem;
  padding: 15px;
  background: var(--bs-tertiary-bg);
  margin-top: 10px;
  min-height: 60px;
}

/* ===== Footer ===== */
.footer-modern {
  background: var(--bs-body-bg);
  border-top: 1px solid var(--bs-border-color);
}

.footer-link {
  color: var(--bs-secondary-color);
  text-decoration: none;
  transition: color var(--transition-fast);
}

.footer-link:hover {
  color: var(--accent);
}

/* ===== Back to Top Button ===== */
#back-to-top {
  background: var(--accent) !important;
  border-color: var(--accent) !important;
}

#back-to-top:hover {
  background: var(--accent-hover) !important;
  border-color: var(--accent-hover) !important;
}

/* ===== Theme Toggle ===== */
#theme-toggle {
  border-color: rgba(0,0,0,0.1);
  transition: transform var(--transition-fast), background var(--transition-fast);
}

#theme-toggle:hover {
  transform: rotate(20deg);
  background: var(--accent-light);
  border-color: var(--accent);
  color: var(--accent);
}

/* ===== Animations ===== */
.fade-in-up {
  opacity: 0;
  transform: translateY(20px);
  animation: fadeInUp 0.5s ease forwards;
}

@keyframes fadeInUp {
  to {
    opacity: 1;
    transform: translateY(0);
  }
}

.stagger-1 { animation-delay: 0.05s; }
.stagger-2 { animation-delay: 0.1s; }
.stagger-3 { animation-delay: 0.15s; }
.stagger-4 { animation-delay: 0.2s; }

/* ===== Primary button override ===== */
.btn-primary {
  background-color: var(--accent);
  border-color: var(--accent);
}

.btn-primary:hover {
  background-color: var(--accent-hover);
  border-color: var(--accent-hover);
}

/* ===== Sticky top z-index ===== */
.sticky-top {
  z-index: 1030;
}

/* ===== Responsive adjustments ===== */
@media (max-width: 767.98px) {
  .hero-section {
    padding: 2rem 1.25rem;
    border-radius: 1rem;
  }
}