/* CSS Design System & Stylesheet for SwiftConvert */

:root {
  /* Dark Mode Palette (Default) */
  --bg-primary: hsl(224, 71%, 4%);
  --bg-secondary: hsla(222, 47%, 8%, 0.7);
  --card-bg: hsla(223, 47%, 12%, 0.65);
  --card-border: hsla(220, 20%, 30%, 0.15);
  --text-primary: hsl(210, 40%, 98%);
  --text-secondary: hsl(215, 20%, 65%);
  --accent-color: hsl(217, 91%, 60%);
  --accent-glow: hsla(217, 91%, 60%, 0.25);
  --input-bg: hsla(223, 47%, 8%, 0.5);
  --input-focus: hsla(217, 91%, 60%, 0.5);
  --pill-active-bg: hsl(217, 91%, 60%);
  --pill-active-text: hsl(210, 40%, 98%);
  --pill-inactive-bg: hsla(223, 47%, 16%, 0.4);
  --pill-inactive-text: hsl(215, 20%, 75%);
  --shadow-sm: 0 2px 8px rgba(0, 0, 0, 0.2);
  --shadow-md: 0 8px 30px rgba(0, 0, 0, 0.3);
  --shadow-lg: 0 16px 40px rgba(0, 0, 0, 0.4);
  --font-family: 'Outfit', sans-serif;
  --transition-fast: 0.15s ease;
  --transition-normal: 0.25s cubic-bezier(0.4, 0, 0.2, 1);
  --border-radius-sm: 8px;
  --border-radius-md: 16px;
  --border-radius-lg: 24px;
}

body.light-mode {
  /* Light Mode Palette */
  --bg-primary: hsl(210, 40%, 96%);
  --bg-secondary: hsla(210, 30%, 90%, 0.6);
  --card-bg: hsla(0, 0%, 100%, 0.75);
  --card-border: hsla(210, 30%, 80%, 0.25);
  --text-primary: hsl(222, 47%, 12%);
  --text-secondary: hsl(215, 16%, 47%);
  --accent-color: hsl(221, 83%, 53%);
  --accent-glow: hsla(221, 83%, 53%, 0.15);
  --input-bg: hsla(210, 30%, 98%, 0.8);
  --input-focus: hsla(221, 83%, 53%, 0.3);
  --pill-active-bg: hsl(221, 83%, 53%);
  --pill-active-text: hsl(210, 40%, 98%);
  --pill-inactive-bg: hsla(0, 0%, 100%, 0.8);
  --pill-inactive-text: hsl(215, 16%, 35%);
  --shadow-sm: 0 2px 8px rgba(0, 0, 0, 0.05);
  --shadow-md: 0 8px 30px rgba(22, 28, 45, 0.08);
  --shadow-lg: 0 16px 40px rgba(22, 28, 45, 0.12);
}

/* Global Reset */
* {
  box-sizing: border-box;
  margin: 0;
  padding: 0;
}

body {
  font-family: var(--font-family);
  background-color: var(--bg-primary);
  color: var(--text-primary);
  min-height: 100vh;
  display: flex;
  flex-direction: column;
  overflow-x: hidden;
  transition: background-color var(--transition-normal), color var(--transition-normal);
}

/* Glassmorphism Background Shapes */
.app-background {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  bottom: 0;
  z-index: -1;
  overflow: hidden;
  pointer-events: none;
}

.app-background::before,
.app-background::after {
  content: '';
  position: absolute;
  border-radius: 50%;
  filter: blur(80px);
  opacity: 0.15;
  transition: all var(--transition-normal);
}

.app-background::before {
  width: 35vw;
  height: 35vw;
  background: var(--accent-color);
  top: -10vw;
  right: 10vw;
}

.app-background::after {
  width: 45vw;
  height: 45vw;
  background: var(--accent-color);
  bottom: -15vw;
  left: -5vw;
}

/* Header Styles */
.app-header {
  border-bottom: 1px solid var(--card-border);
  backdrop-filter: blur(10px);
  -webkit-backdrop-filter: blur(10px);
  background-color: var(--bg-secondary);
  position: sticky;
  top: 0;
  z-index: 100;
  transition: background-color var(--transition-normal), border var(--transition-normal);
}

.header-container {
  max-width: 1200px;
  margin: 0 auto;
  padding: 16px 24px;
  display: flex;
  justify-content: space-between;
  align-items: center;
}

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

.logo-icon {
  font-size: 24px;
  filter: drop-shadow(0 0 8px var(--accent-glow));
}

.logo-text {
  font-weight: 700;
  font-size: 20px;
  letter-spacing: -0.5px;
  background: linear-gradient(135deg, var(--text-primary) 30%, var(--accent-color));
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
}

.tool-nav {
  display: flex;
  align-items: center;
  gap: 4px;
  flex-shrink: 0;
}

.tool-nav-link {
  font-size: 13px;
  font-weight: 500;
  padding: 6px 12px;
  border-radius: 8px;
  text-decoration: none;
  color: var(--text-secondary);
  transition: all var(--transition-fast);
  white-space: nowrap;
  line-height: 1.3;
}

.tool-nav-link:hover {
  color: var(--text-primary);
  background: var(--pill-inactive-bg);
}

.tool-nav-link.active {
  color: var(--accent-color);
  background: hsla(217, 91%, 60%, 0.1);
  cursor: default;
}

@media (max-width: 640px) {
  .tool-nav { display: none; }
}

.theme-toggle {
  background: var(--pill-inactive-bg);
  border: 1px solid var(--card-border);
  cursor: pointer;
  width: 40px;
  height: 40px;
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
  color: var(--text-primary);
  box-shadow: var(--shadow-sm);
  transition: all var(--transition-fast);
}

.theme-toggle:hover {
  transform: scale(1.05);
  border-color: var(--accent-color);
  color: var(--accent-color);
}

.theme-toggle svg {
  transition: transform var(--transition-normal), opacity var(--transition-fast);
}

body.dark-mode .theme-toggle .sun-icon {
  display: block;
}
body.dark-mode .theme-toggle .moon-icon {
  display: none;
}
body.light-mode .theme-toggle .sun-icon {
  display: none;
}
body.light-mode .theme-toggle .moon-icon {
  display: block;
}

/* Main Layout */
.app-main {
  max-width: 800px;
  width: 100%;
  margin: 0 auto;
  padding: 40px 24px;
  display: flex;
  flex-direction: column;
  gap: 32px;
  flex: 1;
}

/* Smart Search */
.search-section {
  width: 100%;
}

.search-container {
  position: relative;
  width: 100%;
}

.search-wrapper {
  display: flex;
  align-items: center;
  background: var(--card-bg);
  border: 1px solid var(--card-border);
  border-radius: var(--border-radius-md);
  padding: 4px 16px;
  box-shadow: var(--shadow-md);
  transition: all var(--transition-normal);
  backdrop-filter: blur(12px);
  -webkit-backdrop-filter: blur(12px);
}

.search-wrapper:focus-within {
  border-color: var(--accent-color);
  box-shadow: 0 0 0 3px var(--accent-glow), var(--shadow-md);
}

.search-icon {
  color: var(--text-secondary);
  margin-right: 12px;
  flex-shrink: 0;
}

#search-input {
  width: 100%;
  border: none;
  background: transparent;
  padding: 12px 0;
  font-family: var(--font-family);
  font-size: 16px;
  color: var(--text-primary);
  outline: none;
}

#search-input::placeholder {
  color: var(--text-secondary);
  opacity: 0.7;
}

.search-clear-btn {
  background: transparent;
  border: none;
  color: var(--text-secondary);
  cursor: pointer;
  padding: 4px;
  display: flex;
  align-items: center;
  justify-content: center;
  border-radius: 50%;
  transition: background-color var(--transition-fast);
}

.search-clear-btn:hover {
  background-color: var(--pill-inactive-bg);
  color: var(--text-primary);
}

/* Suggestions Dropdown */
.search-suggestions {
  position: absolute;
  top: calc(100% + 8px);
  left: 0;
  right: 0;
  background: var(--card-bg);
  border: 1px solid var(--card-border);
  border-radius: var(--border-radius-md);
  box-shadow: var(--shadow-lg);
  z-index: 50;
  overflow: hidden;
  backdrop-filter: blur(16px);
  -webkit-backdrop-filter: blur(16px);
  max-height: 280px;
  overflow-y: auto;
}

.suggestion-item {
  padding: 12px 16px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  cursor: pointer;
  transition: background-color var(--transition-fast);
}

.suggestion-item:hover, .suggestion-item.selected {
  background-color: var(--pill-inactive-bg);
}

.suggestion-query {
  font-weight: 500;
  color: var(--text-primary);
}

.suggestion-type {
  font-size: 12px;
  background: var(--input-bg);
  padding: 2px 8px;
  border-radius: 12px;
  color: var(--accent-color);
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.5px;
}

/* Category Selection */
.categories-section {
  width: 100%;
}

.categories-wrapper {
  position: relative;
  display: flex;
  align-items: center;
  gap: 6px;
  width: 100%;
}

.nav-scroll-btn {
  background: var(--pill-inactive-bg);
  border: 1px solid var(--card-border);
  color: var(--text-primary);
  width: 32px;
  min-width: 32px;
  height: 32px;
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
  cursor: pointer;
  flex-shrink: 0;
  box-shadow: var(--shadow-sm);
  transition: all var(--transition-fast);
  backdrop-filter: blur(8px);
  -webkit-backdrop-filter: blur(8px);
}

.nav-scroll-btn:hover {
  border-color: var(--accent-color);
  color: var(--accent-color);
  transform: scale(1.08);
}

.nav-scroll-btn.disabled {
  opacity: 0.25;
  pointer-events: none;
}

.categories-container {
  display: flex;
  gap: 10px;
  overflow-x: auto;
  padding: 4px 0 12px 0;
  width: 100%;
  scrollbar-width: none;
  -ms-overflow-style: none;
}

.categories-container::-webkit-scrollbar {
  display: none; /* Chrome, Safari, Opera */
}

.category-tab {
  background: var(--pill-inactive-bg);
  border: 1px solid var(--card-border);
  color: var(--pill-inactive-text);
  padding: 10px 18px;
  border-radius: 30px;
  font-family: var(--font-family);
  font-size: 14px;
  font-weight: 500;
  cursor: pointer;
  white-space: nowrap;
  display: flex;
  align-items: center;
  gap: 8px;
  transition: all var(--transition-fast);
  box-shadow: var(--shadow-sm);
}

.category-tab:hover {
  border-color: var(--accent-color);
  color: var(--text-primary);
  transform: translateY(-1px);
}

.category-tab.active {
  background: var(--pill-active-bg);
  color: var(--pill-active-text);
  border-color: var(--pill-active-bg);
  box-shadow: 0 4px 15px var(--accent-glow);
}

/* Edit Order Button */
.edit-order-btn {
  background: var(--pill-inactive-bg);
  border: 1px solid var(--card-border);
  color: var(--text-secondary);
  width: 32px;
  min-width: 32px;
  height: 32px;
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
  cursor: pointer;
  flex-shrink: 0;
  box-shadow: var(--shadow-sm);
  transition: all var(--transition-fast);
}

.edit-order-btn:hover {
  border-color: var(--accent-color);
  color: var(--accent-color);
  transform: scale(1.08);
}

/* Reorder Modal */
.modal-overlay {
  display: none;
  position: fixed;
  inset: 0;
  z-index: 1000;
  background: rgba(0, 0, 0, 0.65);
  backdrop-filter: blur(8px);
  -webkit-backdrop-filter: blur(8px);
  align-items: center;
  justify-content: center;
  padding: 16px;
}

.modal-card {
  background: var(--card-bg);
  border: 1px solid var(--card-border);
  border-radius: var(--border-radius-lg);
  box-shadow: var(--shadow-lg);
  width: 100%;
  max-width: 460px;
  max-height: 90vh;
  display: flex;
  flex-direction: column;
  backdrop-filter: blur(20px);
  -webkit-backdrop-filter: blur(20px);
  animation: modal-in 0.2s ease;
}

@keyframes modal-in {
  from { opacity: 0; transform: scale(0.95) translateY(10px); }
  to { opacity: 1; transform: scale(1) translateY(0); }
}

.modal-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 20px 24px 0 24px;
  flex-shrink: 0;
}

.modal-header h2 {
  font-size: 18px;
  font-weight: 600;
  color: var(--text-primary);
}

.modal-close-btn {
  background: var(--pill-inactive-bg);
  border: 1px solid var(--card-border);
  color: var(--text-secondary);
  width: 32px;
  height: 32px;
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
  cursor: pointer;
  transition: all var(--transition-fast);
  flex-shrink: 0;
}

.modal-close-btn:hover {
  color: var(--text-primary);
  border-color: var(--accent-color);
}

.modal-hint {
  padding: 8px 24px 0 24px;
  font-size: 12px;
  color: var(--text-secondary);
  flex-shrink: 0;
}

.modal-body {
  flex: 1;
  min-height: 0;
  display: flex;
  flex-direction: column;
  padding: 12px 24px;
  overflow: hidden;
}

.sortable-list {
  flex: 1;
  display: flex;
  flex-direction: column;
  list-style: none;
  margin: 0;
  padding: 0;
  gap: 2px;
  min-height: 0;
}

.sortable-item {
  flex: 1;
  min-height: 0;
  display: flex;
  align-items: center;
  gap: 10px;
  padding: 4px 10px;
  background: var(--pill-inactive-bg);
  border: 1px solid var(--card-border);
  border-radius: var(--border-radius-sm);
  font-size: 14px;
  font-weight: 500;
  color: var(--text-primary);
  cursor: default;
  user-select: none;
  -webkit-user-select: none;
  transition: border-color 0.15s ease, background 0.15s ease, opacity 0.15s ease;
  position: relative;
}

.sortable-item:hover {
  border-color: var(--accent-color);
}

.sortable-item .drag-handle {
  font-size: 14px;
  color: var(--text-secondary);
  cursor: grab;
  flex-shrink: 0;
  padding: 4px 2px;
  line-height: 1;
  letter-spacing: -1px;
  touch-action: none;
}

.sortable-item .drag-handle:active {
  cursor: grabbing;
}

.sortable-item .cat-icon {
  font-size: 15px;
  flex-shrink: 0;
}

.sortable-item .cat-name {
  flex: 1;
  min-width: 0;
  overflow: hidden;
  text-overflow: ellipsis;
  white-space: nowrap;
}

.sortable-item.dragging-source {
  opacity: 0.4;
  border-style: dashed;
  border-color: var(--accent-color);
  background: var(--accent-glow);
}

.sortable-item.drag-over {
  border-color: var(--accent-color);
  background: var(--accent-glow);
}

.modal-footer {
  display: flex;
  gap: 10px;
  padding: 16px 24px 20px 24px;
  justify-content: flex-end;
  flex-shrink: 0;
}

.modal-btn {
  padding: 10px 22px;
  border-radius: var(--border-radius-sm);
  font-family: var(--font-family);
  font-size: 14px;
  font-weight: 600;
  cursor: pointer;
  border: 1px solid var(--card-border);
  transition: all var(--transition-fast);
}

.modal-btn-secondary {
  background: var(--pill-inactive-bg);
  color: var(--text-primary);
}

.modal-btn-secondary:hover {
  border-color: var(--accent-color);
}

.modal-btn-primary {
  background: var(--pill-active-bg);
  color: var(--pill-active-text);
  border-color: var(--pill-active-bg);
}

.modal-btn-primary:hover {
  filter: brightness(1.1);
}

/* Responsive: tighter modal padding on small screens */
@media (max-width: 480px) {
  .modal-header {
    padding: 16px 16px 0 16px;
  }
  .modal-header h2 {
    font-size: 16px;
  }
  .modal-hint {
    padding: 6px 16px 0 16px;
    font-size: 11px;
  }
  .modal-body {
    padding: 8px 16px;
  }
  .sortable-item {
    padding: 2px 8px;
    gap: 8px;
    font-size: 13px;
  }
  .modal-footer {
    padding: 12px 16px 16px 16px;
  }
}

/* Converter Card */
.converter-section {
  width: 100%;
}

.converter-card {
  background: var(--card-bg);
  border: 1px solid var(--card-border);
  border-radius: var(--border-radius-lg);
  padding: 28px;
  box-shadow: var(--shadow-md);
  display: flex;
  align-items: center;
  gap: 16px;
  backdrop-filter: blur(12px);
  -webkit-backdrop-filter: blur(12px);
  position: relative;
  transition: border-color var(--transition-normal);
}

.converter-panel {
  flex: 1;
  display: flex;
  flex-direction: column;
  gap: 8px;
}

.panel-label {
  font-size: 13px;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 1px;
  color: var(--text-secondary);
}

.panel-input-group {
  display: flex;
  background: var(--input-bg);
  border: 1px solid var(--card-border);
  border-radius: var(--border-radius-md);
  overflow: hidden;
  transition: all var(--transition-fast);
}

.panel-input-group:focus-within {
  border-color: var(--accent-color);
  box-shadow: 0 0 0 3px var(--accent-glow);
}

.panel-input-group input {
  width: 60%;
  background: transparent;
  border: none;
  padding: 16px;
  font-family: var(--font-family);
  font-size: 20px;
  font-weight: 600;
  color: var(--text-primary);
  outline: none;
}

/* Remove numeric spin buttons */
.panel-input-group input::-webkit-outer-spin-button,
.panel-input-group input::-webkit-inner-spin-button {
  -webkit-appearance: none;
  margin: 0;
}
.panel-input-group input[type=number] {
  -moz-appearance: textfield;
}

.panel-input-group select {
  width: 40%;
  background: var(--pill-inactive-bg);
  border: none;
  border-left: 1px solid var(--card-border);
  padding: 0 16px;
  font-family: var(--font-family);
  font-size: 16px;
  font-weight: 500;
  color: var(--text-primary);
  cursor: pointer;
  outline: none;
  appearance: none;
  -webkit-appearance: none;
  background-image: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='16' height='16' viewBox='0 0 24 24' fill='none' stroke='%2394a3b8' stroke-width='2.5' stroke-linecap='round' stroke-linejoin='round'%3E%3Cpath d='m6 9 6 6 6-6'/%3E%3C/svg%3E");
  background-repeat: no-repeat;
  background-position: calc(100% - 12px) center;
  padding-right: 32px;
  transition: all var(--transition-fast);
}

.panel-input-group select:hover {
  background-color: var(--input-bg);
}

.unit-full-name {
  font-size: 13px;
  color: var(--text-secondary);
  min-height: 18px;
  padding-left: 4px;
}

/* Swap Button styling */
.swap-action {
  display: flex;
  align-items: center;
  justify-content: center;
  z-index: 10;
}

.swap-btn {
  background: var(--pill-inactive-bg);
  border: 1px solid var(--card-border);
  color: var(--text-primary);
  width: 48px;
  height: 48px;
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
  cursor: pointer;
  box-shadow: var(--shadow-sm);
  transition: all var(--transition-normal);
}

.swap-btn:hover {
  border-color: var(--accent-color);
  color: var(--accent-color);
  transform: rotate(180deg) scale(1.05);
  box-shadow: 0 0 12px var(--accent-glow);
}

/* Conversions Grid Section */
.grid-section {
  width: 100%;
}

.section-header {
  margin-bottom: 16px;
}

.section-header h2 {
  font-size: 18px;
  font-weight: 600;
  color: var(--text-primary);
}

.conversions-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(220px, 1fr));
  gap: 14px;
}

.grid-card {
  background: var(--card-bg);
  border: 1px solid var(--card-border);
  border-radius: var(--border-radius-md);
  padding: 16px;
  display: flex;
  flex-direction: column;
  gap: 4px;
  box-shadow: var(--shadow-sm);
  transition: all var(--transition-fast);
  cursor: pointer;
}

.grid-card:hover {
  transform: translateY(-2px);
  border-color: var(--accent-color);
  box-shadow: var(--shadow-md);
}

.grid-card.current {
  border-color: var(--accent-color);
  background: var(--accent-glow);
  cursor: default;
}

.grid-card.current:hover {
  transform: none;
}

.grid-card-value {
  font-size: 18px;
  font-weight: 700;
  color: var(--text-primary);
  overflow: hidden;
  text-overflow: ellipsis;
  white-space: nowrap;
}

.grid-card-unit {
  font-size: 12px;
  color: var(--text-secondary);
  font-weight: 500;
  text-transform: uppercase;
  letter-spacing: 0.5px;
}

/* Footer Styling */
.app-footer {
  text-align: center;
  padding: 24px;
  color: var(--text-secondary);
  font-size: 13px;
  border-top: 1px solid var(--card-border);
  margin-top: auto;
  transition: border var(--transition-normal);
}

/* Responsive Styles */
@media (max-width: 768px) {
  .app-main {
    padding: 24px 16px;
    gap: 24px;
  }
  
  .converter-card {
    flex-direction: column;
    padding: 20px;
    gap: 10px;
  }
  
  .converter-panel {
    width: 100%;
  }
  
  .swap-action {
    margin: 8px 0;
  }
  
  .swap-btn {
    transform: rotate(90deg);
  }
  
  .swap-btn:hover {
    transform: rotate(270deg) scale(1.05);
  }
  
  .conversions-grid {
    grid-template-columns: repeat(auto-fill, minmax(170px, 1fr));
  }
}

.app-footer a {
  color: var(--accent-color);
  text-decoration: none;
}

.app-footer a:hover {
  text-decoration: underline;
}

.other-tools {
  margin-top: 32px;
}

.tools-list {
  display: flex;
  flex-direction: column;
  gap: 12px;
}

.tool-card {
  display: flex;
  align-items: center;
  gap: 16px;
  background: var(--card-bg);
  border: 1px solid var(--card-border);
  border-radius: var(--border-radius-md);
  padding: 16px 20px;
  text-decoration: none;
  color: inherit;
  transition: all var(--transition-normal);
}

.tool-card:hover {
  border-color: var(--accent-color);
  box-shadow: 0 0 0 1px var(--accent-glow);
  transform: translateY(-1px);
}

.tool-card-icon {
  font-size: 28px;
  flex-shrink: 0;
}

.tool-card-body {
  flex: 1;
  min-width: 0;
}

.tool-card-title {
  font-size: 16px;
  font-weight: 600;
  margin-bottom: 4px;
}

.tool-card-desc {
  font-size: 13px;
  color: var(--text-secondary);
  line-height: 1.4;
}

.tool-card-arrow {
  font-size: 18px;
  color: var(--text-secondary);
  flex-shrink: 0;
  transition: transform var(--transition-fast);
}

.tool-card:hover .tool-card-arrow {
  transform: translateX(4px);
  color: var(--accent-color);
}