/* ============================================================
   GridCrafter Shared Components
   ============================================================ */

/* --- Header --- */
.header {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  height: var(--header-height);
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 0 var(--space-6);
  background: rgba(10, 14, 26, 0.85);
  backdrop-filter: blur(16px);
  -webkit-backdrop-filter: blur(16px);
  border-bottom: 1px solid var(--color-border);
  z-index: var(--z-fixed);
  transition: background var(--transition-base);
}
[data-theme="light"] .header {
  background: rgba(248, 250, 252, 0.85);
}
.header__logo {
  display: flex;
  align-items: center;
  gap: var(--space-3);
  font-size: var(--font-size-xl);
  font-weight: 700;
  color: var(--color-text-primary);
  text-decoration: none;
}
.header__logo img {
  width: 32px;
  height: 32px;
}
.header__logo-text .text-gradient {
  font-weight: 800;
}
.header__nav {
  display: flex;
  align-items: center;
  gap: var(--space-6);
}
.header__nav a {
  font-size: var(--font-size-sm);
  font-weight: 500;
  color: var(--color-text-secondary);
  transition: color var(--transition-fast);
  position: relative;
}
.header__nav a:hover,
.header__nav a.active {
  color: var(--color-text-primary);
}
.header__nav a.active::after {
  content: '';
  position: absolute;
  bottom: -4px;
  left: 0;
  right: 0;
  height: 2px;
  background: var(--gradient-primary);
  border-radius: var(--radius-full);
}

/* --- Theme Toggle --- */
.theme-toggle {
  width: 40px;
  height: 40px;
  display: flex;
  align-items: center;
  justify-content: center;
  border-radius: var(--radius-lg);
  color: var(--color-text-secondary);
  transition: all var(--transition-fast);
}
.theme-toggle:hover {
  background: var(--color-surface);
  color: var(--color-text-primary);
}
.theme-toggle svg {
  width: 20px;
  height: 20px;
}

/* --- Buttons --- */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: var(--space-2);
  padding: var(--space-3) var(--space-5);
  font-size: var(--font-size-sm);
  font-weight: 600;
  border-radius: var(--radius-lg);
  transition: all var(--transition-base);
  white-space: nowrap;
  position: relative;
  overflow: hidden;
}
.btn-primary {
  background: var(--gradient-primary);
  color: white;
  box-shadow: var(--shadow-md), 0 0 0 0 var(--color-accent-blue-glow);
}
.btn-primary:hover {
  background: var(--gradient-primary-hover);
  box-shadow: var(--shadow-lg), 0 0 20px var(--color-accent-blue-glow);
  transform: translateY(-1px);
}
.btn-primary:active {
  transform: translateY(0);
}
.btn-secondary {
  background: var(--color-surface);
  color: var(--color-text-primary);
  border: 1px solid var(--color-border);
}
.btn-secondary:hover {
  background: var(--color-surface-hover);
  border-color: var(--color-border-hover);
}
.btn-ghost {
  color: var(--color-text-secondary);
}
.btn-ghost:hover {
  background: var(--color-surface);
  color: var(--color-text-primary);
}
.btn-lg {
  padding: var(--space-4) var(--space-8);
  font-size: var(--font-size-base);
  border-radius: var(--radius-xl);
}
.btn-sm {
  padding: var(--space-2) var(--space-3);
  font-size: var(--font-size-xs);
}
.btn svg {
  width: 16px;
  height: 16px;
}

/* --- Cards --- */
.card {
  background: var(--color-bg-card);
  backdrop-filter: blur(12px);
  -webkit-backdrop-filter: blur(12px);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-xl);
  padding: var(--space-6);
  transition: all var(--transition-base);
}
.card:hover {
  background: var(--color-bg-card-hover);
  border-color: var(--color-border-hover);
  box-shadow: var(--shadow-lg);
  transform: translateY(-2px);
}
.card__icon {
  width: 48px;
  height: 48px;
  display: flex;
  align-items: center;
  justify-content: center;
  border-radius: var(--radius-lg);
  background: var(--gradient-primary);
  color: white;
  font-size: var(--font-size-xl);
  margin-bottom: var(--space-4);
}
.card__title {
  font-size: var(--font-size-xl);
  font-weight: 700;
  margin-bottom: var(--space-2);
}
.card__description {
  color: var(--color-text-secondary);
  font-size: var(--font-size-sm);
  line-height: 1.6;
}
.card__arrow {
  display: flex;
  align-items: center;
  gap: var(--space-2);
  margin-top: var(--space-4);
  font-size: var(--font-size-sm);
  font-weight: 600;
  color: var(--color-accent-blue-light);
  transition: gap var(--transition-base);
}
.card:hover .card__arrow {
  gap: var(--space-3);
}

/* --- Upload Zone --- */
.upload-zone {
  position: relative;
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  gap: var(--space-4);
  padding: var(--space-12) var(--space-8);
  border: 2px dashed var(--color-border-hover);
  border-radius: var(--radius-xl);
  background: var(--gradient-card);
  cursor: pointer;
  transition: all var(--transition-base);
  text-align: center;
}
.upload-zone:hover,
.upload-zone.dragover {
  border-color: var(--color-accent-blue);
  background: var(--color-accent-blue-glow);
  box-shadow: var(--shadow-glow-blue);
}
.upload-zone.dragover {
  transform: scale(1.01);
}
.upload-zone__icon {
  width: 64px;
  height: 64px;
  display: flex;
  align-items: center;
  justify-content: center;
  border-radius: var(--radius-full);
  background: var(--color-surface);
  color: var(--color-accent-blue-light);
  font-size: var(--font-size-2xl);
  transition: transform var(--transition-spring);
}
.upload-zone:hover .upload-zone__icon {
  transform: scale(1.1);
}
.upload-zone__title {
  font-size: var(--font-size-lg);
  font-weight: 600;
}
.upload-zone__subtitle {
  font-size: var(--font-size-sm);
  color: var(--color-text-tertiary);
}
.upload-zone input[type="file"] {
  position: absolute;
  inset: 0;
  opacity: 0;
  cursor: pointer;
}

/* --- Control Group --- */
.control-group {
  display: flex;
  flex-direction: column;
  gap: var(--space-2);
}
.control-group__label {
  font-size: var(--font-size-sm);
  font-weight: 600;
  color: var(--color-text-secondary);
  display: flex;
  justify-content: space-between;
  align-items: center;
}
.control-group__value {
  font-weight: 400;
  color: var(--color-accent-blue-light);
  font-variant-numeric: tabular-nums;
}

/* --- Range Slider --- */
input[type="range"] {
  -webkit-appearance: none;
  width: 100%;
  height: 6px;
  background: var(--color-surface);
  border-radius: var(--radius-full);
  outline: none;
  cursor: pointer;
}
input[type="range"]::-webkit-slider-thumb {
  -webkit-appearance: none;
  width: 18px;
  height: 18px;
  border-radius: 50%;
  background: var(--gradient-primary);
  box-shadow: 0 0 8px var(--color-accent-blue-glow);
  cursor: pointer;
  transition: transform var(--transition-fast);
}
input[type="range"]::-webkit-slider-thumb:hover {
  transform: scale(1.2);
}
input[type="range"]::-moz-range-thumb {
  width: 18px;
  height: 18px;
  border-radius: 50%;
  background: var(--gradient-primary);
  border: none;
  cursor: pointer;
}

/* --- Number Input --- */
.number-input {
  width: 60px;
  padding: var(--space-1) var(--space-2);
  background: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-sm);
  color: var(--color-text-primary);
  text-align: center;
  font-variant-numeric: tabular-nums;
  transition: border-color var(--transition-fast);
}
.number-input:focus {
  border-color: var(--color-border-focus);
}

/* --- Color Picker --- */
.color-picker-wrapper {
  display: flex;
  align-items: center;
  gap: var(--space-3);
}
.color-picker-wrapper input[type="color"] {
  -webkit-appearance: none;
  width: 36px;
  height: 36px;
  border: 2px solid var(--color-border);
  border-radius: var(--radius-md);
  cursor: pointer;
  padding: 2px;
  background: var(--color-surface);
}
.color-picker-wrapper input[type="color"]::-webkit-color-swatch-wrapper {
  padding: 0;
}
.color-picker-wrapper input[type="color"]::-webkit-color-swatch {
  border: none;
  border-radius: 4px;
}

/* --- Toggle Switch --- */
.toggle {
  position: relative;
  width: 44px;
  height: 24px;
  background: var(--color-surface);
  border-radius: var(--radius-full);
  cursor: pointer;
  transition: background var(--transition-fast);
  border: 1px solid var(--color-border);
}
.toggle.active {
  background: var(--color-accent-blue);
  border-color: var(--color-accent-blue);
}
.toggle::after {
  content: '';
  position: absolute;
  top: 2px;
  left: 2px;
  width: 18px;
  height: 18px;
  border-radius: 50%;
  background: white;
  transition: transform var(--transition-fast);
  box-shadow: var(--shadow-sm);
}
.toggle.active::after {
  transform: translateX(20px);
}

/* --- Toggle Group (button row) --- */
.toggle-group {
  display: flex;
  gap: 1px;
  background: var(--color-border);
  border-radius: var(--radius-lg);
  overflow: hidden;
}
.toggle-group__item {
  flex: 1;
  padding: var(--space-2) var(--space-3);
  font-size: var(--font-size-sm);
  font-weight: 500;
  text-align: center;
  background: var(--color-surface);
  color: var(--color-text-secondary);
  transition: all var(--transition-fast);
}
.toggle-group__item:hover {
  color: var(--color-text-primary);
  background: var(--color-surface-hover);
}
.toggle-group__item.active {
  background: var(--color-accent-blue);
  color: white;
}

/* --- Section Accordion --- */
.accordion {
  border: 1px solid var(--color-border);
  border-radius: var(--radius-lg);
  overflow: hidden;
}
.accordion__header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: var(--space-4);
  font-size: var(--font-size-sm);
  font-weight: 600;
  cursor: pointer;
  transition: background var(--transition-fast);
}
.accordion__header:hover {
  background: var(--color-surface);
}
.accordion__chevron {
  transition: transform var(--transition-fast);
}
.accordion.open .accordion__chevron {
  transform: rotate(180deg);
}
.accordion__body {
  max-height: 0;
  overflow: hidden;
  transition: max-height var(--transition-slow);
}
.accordion.open .accordion__body {
  max-height: 500px;
}
.accordion__content {
  padding: 0 var(--space-4) var(--space-4);
  display: flex;
  flex-direction: column;
  gap: var(--space-4);
}

/* --- Toast --- */
.toast-container {
  position: fixed;
  bottom: var(--space-6);
  right: var(--space-6);
  z-index: var(--z-toast);
  display: flex;
  flex-direction: column;
  gap: var(--space-3);
}
.toast {
  display: flex;
  align-items: center;
  gap: var(--space-3);
  padding: var(--space-3) var(--space-5);
  background: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-lg);
  box-shadow: var(--shadow-xl);
  font-size: var(--font-size-sm);
  animation: fadeInUp 0.3s ease;
}
.toast--success { border-left: 3px solid var(--color-success); }
.toast--error { border-left: 3px solid var(--color-error); }
.toast--warning { border-left: 3px solid var(--color-warning); }

/* --- Modal --- */
.modal-overlay {
  position: fixed;
  inset: 0;
  background: var(--color-bg-overlay);
  backdrop-filter: blur(4px);
  z-index: var(--z-modal);
  display: none;
  align-items: center;
  justify-content: center;
  animation: fadeIn 0.2s ease;
}
.modal-overlay.active {
  display: flex;
}
.modal {
  background: var(--color-bg-secondary);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-2xl);
  padding: var(--space-8);
  max-width: 500px;
  width: 90%;
  box-shadow: var(--shadow-xl);
  animation: fadeInUp 0.3s ease;
}
.modal__title {
  font-size: var(--font-size-xl);
  font-weight: 700;
  margin-bottom: var(--space-4);
}

/* --- Sidebar Panel (for tool pages) --- */
.sidebar-panel {
  width: var(--sidebar-width);
  height: calc(100vh - var(--header-height));
  position: fixed;
  right: 0;
  top: var(--header-height);
  background: var(--color-bg-secondary);
  border-left: 1px solid var(--color-border);
  overflow-y: auto;
  padding: var(--space-4);
  display: flex;
  flex-direction: column;
  gap: var(--space-3);
  z-index: var(--z-sticky);
}
.sidebar-panel::-webkit-scrollbar {
  width: 4px;
}
.sidebar-panel::-webkit-scrollbar-track {
  background: transparent;
}
.sidebar-panel::-webkit-scrollbar-thumb {
  background: var(--color-border-hover);
  border-radius: var(--radius-full);
}

/* --- Section Divider --- */
.section-divider {
  height: 1px;
  background: var(--color-border);
  margin: var(--space-2) 0;
}

/* --- Footer --- */
.footer {
  padding: var(--space-12) 0 var(--space-8);
  border-top: 1px solid var(--color-border);
  text-align: center;
}
.footer__links {
  display: flex;
  justify-content: center;
  gap: var(--space-6);
  margin-bottom: var(--space-4);
}
.footer__links a {
  font-size: var(--font-size-sm);
  color: var(--color-text-secondary);
}
.footer__links a:hover {
  color: var(--color-text-primary);
}
.footer__copy {
  font-size: var(--font-size-xs);
  color: var(--color-text-tertiary);
}

/* --- Mobile Sidebar --- */
@media (max-width: 1024px) {
  .sidebar-panel {
    position: fixed;
    bottom: 0;
    left: 0;
    right: 0;
    top: auto;
    width: 100%;
    height: auto;
    max-height: 50vh;
    border-left: none;
    border-top: 1px solid var(--color-border);
    border-radius: var(--radius-2xl) var(--radius-2xl) 0 0;
    z-index: var(--z-overlay);
    transform: translateY(calc(100% - 48px));
    transition: transform var(--transition-slow);
  }
  .sidebar-panel.expanded {
    transform: translateY(0);
  }
  .sidebar-panel__handle {
    display: block;
    width: 40px;
    height: 4px;
    background: var(--color-border-hover);
    border-radius: var(--radius-full);
    margin: 0 auto var(--space-4);
    cursor: grab;
  }
}
@media (min-width: 1025px) {
  .sidebar-panel__handle {
    display: none;
  }
}

/* --- Mobile Nav --- */
@media (max-width: 768px) {
  .header__nav {
    display: none;
  }
  .header__nav.open {
    display: flex;
    flex-direction: column;
    position: fixed;
    top: var(--header-height);
    left: 0;
    right: 0;
    background: var(--color-bg-secondary);
    border-bottom: 1px solid var(--color-border);
    padding: var(--space-4);
    gap: var(--space-4);
    animation: fadeInDown 0.2s ease;
    z-index: var(--z-fixed);
  }
  .mobile-menu-btn {
    display: flex;
  }
}
@media (min-width: 769px) {
  .mobile-menu-btn {
    display: none;
  }
}