/* ==================== CSS Variables ==================== */
:root {
  --color-primary: #3776A1;
  --color-primary-light: #5293BB;
  --color-primary-dark: #1B5886;
  --color-secondary: #6EB1D6;
  --color-accent: #89CFF1;

  --color-bg: #ffffff;
  --color-bg-secondary: #f8fafc;
  --color-bg-tertiary: #f1f5f9;
  --color-surface: #ffffff;

  --color-text: #1e293b;
  --color-text-secondary: #475569;
  --color-text-muted: #64748b;

  --color-border: #e2e8f0;
  --color-border-light: #f1f5f9;

  --shadow-sm: 0 1px 2px rgba(0, 0, 0, 0.05);
  --shadow-md: 0 4px 6px -1px rgba(0, 0, 0, 0.1), 0 2px 4px -2px rgba(0, 0, 0, 0.1);
  --shadow-lg: 0 10px 15px -3px rgba(0, 0, 0, 0.1), 0 4px 6px -4px rgba(0, 0, 0, 0.1);

  --font-family: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
  --font-size-xs: 0.75rem;
  --font-size-sm: 0.875rem;
  --font-size-base: 1rem;
  --font-size-lg: 1.125rem;
  --font-size-xl: 1.25rem;
  --font-size-2xl: 1.5rem;
  --font-size-3xl: 1.875rem;
  --font-size-4xl: 2.25rem;

  --space-1: 0.25rem;
  --space-2: 0.5rem;
  --space-3: 0.75rem;
  --space-4: 1rem;
  --space-5: 1.25rem;
  --space-6: 1.5rem;
  --space-8: 2rem;
  --space-10: 2.5rem;
  --space-12: 3rem;
  --space-16: 4rem;

  --radius-sm: 0.375rem;
  --radius-md: 0.5rem;
  --radius-lg: 0.75rem;
  --radius-xl: 1rem;
  --radius-full: 9999px;

  --transition-fast: 150ms ease;
  --transition-base: 300ms ease;
}

/* ==================== Dark Mode ==================== */
[data-theme="dark"] {
  --color-primary: #5293BB;
  --color-primary-light: #6EB1D6;
  --color-primary-dark: #3776A1;
  --color-secondary: #89CFF1;

  --color-bg: #0a1929;
  --color-bg-secondary: #0d2137;
  --color-bg-tertiary: #132f4c;
  --color-surface: #0d2137;

  --color-text: #f1f5f9;
  --color-text-secondary: #cbd5e1;
  --color-text-muted: #94a3b8;

  --color-border: #1e4976;
  --color-border-light: #132f4c;

  --shadow-sm: 0 1px 2px rgba(0, 0, 0, 0.3);
  --shadow-md: 0 4px 6px -1px rgba(0, 0, 0, 0.4), 0 2px 4px -2px rgba(0, 0, 0, 0.3);
  --shadow-lg: 0 10px 15px -3px rgba(0, 0, 0, 0.4), 0 4px 6px -4px rgba(0, 0, 0, 0.3);
}

/* ==================== Skip Link ==================== */
.skip-link {
  position: absolute;
  top: -100%;
  left: 50%;
  transform: translateX(-50%);
  padding: var(--space-3) var(--space-6);
  background-color: var(--color-primary);
  color: #fff;
  border-radius: var(--radius-md);
  font-size: var(--font-size-sm);
  font-weight: 500;
  z-index: 1000;
  transition: top var(--transition-fast);
}

.skip-link:focus {
  top: var(--space-4);
}

/* ==================== Base Styles ==================== */
*,
*::before,
*::after {
  box-sizing: border-box;
  margin: 0;
  padding: 0;
}

html {
  scroll-behavior: smooth;
}

body {
  font-family: var(--font-family);
  font-size: var(--font-size-base);
  line-height: 1.6;
  color: var(--color-text);
  background-color: var(--color-bg);
  transition: background-color var(--transition-base), color var(--transition-base);
  min-height: 100vh;
  display: flex;
  flex-direction: column;
}

a {
  text-decoration: none;
  color: inherit;
  transition: color var(--transition-fast);
}

button {
  font-family: inherit;
  cursor: pointer;
  border: none;
  background: none;
}

ul {
  list-style: none;
}

.container {
  width: 100%;
  max-width: 1200px;
  margin: 0 auto;
  padding: 0 var(--space-6);
}

/* ==================== Navigation ==================== */
.navbar {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  z-index: 1000;
  background-color: rgba(255, 255, 255, 0.95);
  backdrop-filter: blur(20px);
  box-shadow: var(--shadow-sm);
  transition: all var(--transition-base);
}

[data-theme="dark"] .navbar {
  background-color: rgba(10, 25, 41, 0.95);
}

.nav-container {
  display: flex;
  align-items: center;
  justify-content: space-between;
  max-width: 1200px;
  margin: 0 auto;
  padding: var(--space-4) var(--space-6);
}

.nav-logo {
  display: flex;
  align-items: center;
  gap: var(--space-2);
}

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

.logo-divider {
  color: var(--color-border);
  font-weight: 300;
}

.logo-tools {
  font-size: var(--font-size-base);
  font-weight: 600;
  color: var(--color-text-secondary);
}

.nav-menu {
  display: flex;
  align-items: center;
}

.nav-list {
  display: flex;
  align-items: center;
  gap: var(--space-6);
}

.nav-link {
  font-size: var(--font-size-sm);
  font-weight: 500;
  color: var(--color-text-secondary);
  padding: var(--space-2) 0;
  position: relative;
  transition: color var(--transition-fast);
}

.nav-link::after {
  content: '';
  position: absolute;
  bottom: 0;
  left: 0;
  width: 0;
  height: 2px;
  background: linear-gradient(135deg, var(--color-primary), var(--color-secondary));
  transition: width var(--transition-base);
}

.nav-link:hover,
.nav-link.active {
  color: var(--color-text);
}

.nav-link:hover::after,
.nav-link.active::after {
  width: 100%;
}

.nav-count {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  min-width: 20px;
  height: 18px;
  padding: 0 6px;
  margin-left: var(--space-2);
  margin-bottom: 2px;
  font-size: 0.65rem;
  font-weight: 600;
  color: var(--color-text-muted);
  vertical-align: middle;
  background-color: var(--color-bg-tertiary);
  border-radius: var(--radius-full);
}

.nav-link.active .nav-count {
  color: #fff;
  background-color: var(--color-primary);
}

.nav-item-divider {
  width: 1px;
  height: 20px;
  background-color: var(--color-border);
  margin: 0 var(--space-2);
}

.nav-close {
  display: none;
}

.nav-actions {
  display: flex;
  align-items: center;
  gap: var(--space-4);
}

/* ==================== Back Button ==================== */
.back-btn {
  width: 40px;
  height: 40px;
  border-radius: var(--radius-full);
  display: flex;
  align-items: center;
  justify-content: center;
  background-color: var(--color-bg-secondary);
  color: var(--color-text);
  transition: all var(--transition-fast);
}

.back-btn:hover {
  background-color: var(--color-primary);
  color: #fff;
}

/* ==================== Theme Toggle ==================== */
.theme-toggle {
  width: 40px;
  height: 40px;
  border-radius: var(--radius-full);
  display: flex;
  align-items: center;
  justify-content: center;
  background-color: var(--color-bg-secondary);
  color: var(--color-text);
  transition: all var(--transition-fast);
  position: relative;
  overflow: hidden;
}

.theme-toggle:hover {
  background-color: var(--color-primary);
  color: #fff;
}

.theme-toggle .fa-moon {
  position: absolute;
  transition: all var(--transition-base);
}

.theme-toggle .fa-sun {
  position: absolute;
  opacity: 0;
  transform: rotate(-90deg) scale(0);
  transition: all var(--transition-base);
}

[data-theme="dark"] .theme-toggle .fa-moon {
  opacity: 0;
  transform: rotate(90deg) scale(0);
}

[data-theme="dark"] .theme-toggle .fa-sun {
  opacity: 1;
  transform: rotate(0) scale(1);
}

/* ==================== Mobile Nav Toggle ==================== */
.nav-toggle {
  display: none;
  flex-direction: column;
  gap: 5px;
  width: 44px;
  height: 44px;
  align-items: center;
  justify-content: center;
}

.nav-toggle span {
  width: 22px;
  height: 2px;
  background-color: var(--color-text);
  border-radius: 2px;
  transition: all var(--transition-fast);
}

/* ==================== Tools Page ==================== */
.tools-page {
  flex: 1;
  padding-top: 100px;
  padding-bottom: var(--space-16);
}

/* ==================== Tool Page (Individual Tools) ==================== */
.tool-page {
  flex: 1;
  padding-top: 100px;
  padding-bottom: var(--space-8);
}

/* ==================== Shared Tool Wrapper ==================== */
.tool-wrapper {
  max-width: 1000px;
  margin: 0 auto;
  background-color: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-xl);
  overflow: hidden;
  box-shadow: var(--shadow-lg);
}

/* ==================== Shared Tool Header ==================== */
.tool-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: var(--space-4) var(--space-5);
  background-color: var(--color-bg);
  border-bottom: 1px solid var(--color-border);
}

.tool-header h2 {
  display: flex;
  align-items: center;
  gap: var(--space-3);
  font-size: var(--font-size-xl);
  font-weight: 700;
  color: var(--color-text);
  margin: 0;
}

.tool-header h2 i {
  color: var(--color-primary);
}

.tool-header-actions {
  display: flex;
  gap: var(--space-2);
}

/* ==================== Shared Tool Tabs ==================== */
.tool-tabs {
  display: flex;
  background-color: var(--color-bg-secondary);
  border-bottom: 1px solid var(--color-border);
}

.tool-tab {
  flex: 1;
  display: flex;
  align-items: center;
  justify-content: center;
  gap: var(--space-2);
  padding: var(--space-3) var(--space-4);
  font-size: var(--font-size-sm);
  font-weight: 500;
  color: var(--color-text-secondary);
  background: none;
  border: none;
  cursor: pointer;
  transition: all var(--transition-fast);
  position: relative;
}

.tool-tab::after {
  content: '';
  position: absolute;
  bottom: 0;
  left: 0;
  right: 0;
  height: 3px;
  background: linear-gradient(135deg, var(--color-primary), var(--color-secondary));
  transform: scaleX(0);
  transition: transform var(--transition-fast);
}

.tool-tab:hover {
  color: var(--color-text);
  background-color: var(--color-bg-tertiary);
}

.tool-tab.active {
  color: var(--color-primary);
}

.tool-tab.active::after {
  transform: scaleX(1);
}

.tool-tab i {
  font-size: var(--font-size-base);
}

/* ==================== Shared Tool Content/Panel ==================== */
.tool-content {
  padding: var(--space-5);
}

.tool-panel {
  display: none;
  padding: var(--space-5);
}

.tool-panel.active {
  display: block;
}

/* ==================== Shared Action Buttons ==================== */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: var(--space-2);
  padding: var(--space-2) var(--space-3);
  font-size: var(--font-size-sm);
  font-weight: 500;
  border-radius: var(--radius-md);
  cursor: pointer;
  transition: all var(--transition-fast);
  border: 1px solid transparent;
  white-space: nowrap;
}

.btn-primary {
  background: linear-gradient(135deg, var(--color-primary), var(--color-primary-dark));
  color: #fff;
  border: none;
}

.btn-primary:hover {
  transform: translateY(-1px);
  box-shadow: 0 4px 12px rgba(55, 118, 161, 0.3);
}

.btn-secondary {
  background-color: var(--color-bg-secondary);
  color: var(--color-text-secondary);
  border: 1px solid var(--color-border);
}

.btn-secondary:hover {
  background-color: var(--color-primary);
  border-color: var(--color-primary);
  color: #fff;
}

.btn-outline {
  background-color: transparent;
  color: var(--color-text-secondary);
  border: 1px solid var(--color-border);
}

.btn-outline:hover {
  border-color: var(--color-primary);
  color: var(--color-primary);
  background-color: rgba(55, 118, 161, 0.05);
}

.btn-danger {
  background-color: transparent;
  color: var(--color-text-secondary);
  border: 1px solid var(--color-border);
}

.btn-danger:hover {
  background-color: rgba(239, 68, 68, 0.1);
  border-color: #ef4444;
  color: #ef4444;
}

.btn-lg {
  padding: var(--space-3) var(--space-5);
  font-size: var(--font-size-base);
}

.btn-xl {
  padding: var(--space-4) var(--space-6);
  font-size: var(--font-size-lg);
  font-weight: 600;
}

.btn-icon {
  width: 36px;
  height: 36px;
  padding: 0;
}

.btn-icon-sm {
  width: 32px;
  height: 32px;
  padding: 0;
}

/* ==================== Shared Form Elements ==================== */
.form-group {
  display: flex;
  flex-direction: column;
  gap: var(--space-2);
}

.form-label {
  font-size: var(--font-size-sm);
  font-weight: 600;
  color: var(--color-text);
}

.form-hint {
  font-size: var(--font-size-xs);
  color: var(--color-text-muted);
}

.form-input,
.form-textarea,
.form-select {
  width: 100%;
  padding: var(--space-3);
  font-family: inherit;
  font-size: var(--font-size-sm);
  color: var(--color-text);
  background-color: var(--color-bg-secondary);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-md);
  transition: border-color var(--transition-fast), box-shadow var(--transition-fast);
  outline: none;
}

.form-input:focus,
.form-textarea:focus,
.form-select:focus {
  border-color: var(--color-primary);
  box-shadow: 0 0 0 3px rgba(55, 118, 161, 0.1);
}

.form-input::placeholder,
.form-textarea::placeholder {
  color: var(--color-text-muted);
}

.form-textarea {
  resize: vertical;
  min-height: 100px;
  line-height: 1.6;
}

.form-input-mono,
.form-textarea-mono {
  font-family: 'Consolas', 'Monaco', 'Courier New', monospace;
}

/* ==================== Shared Section/Card ==================== */
.tool-section {
  background-color: var(--color-bg);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-lg);
  overflow: hidden;
}

.tool-section-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: var(--space-3) var(--space-4);
  background-color: var(--color-surface);
  border-bottom: 1px solid var(--color-border);
}

.tool-section-header h3 {
  font-size: var(--font-size-sm);
  font-weight: 600;
  color: var(--color-text);
  margin: 0;
}

.tool-section-content {
  padding: var(--space-4);
}

/* ==================== Shared Toast ==================== */
.toast {
  position: fixed;
  bottom: var(--space-6);
  left: 50%;
  transform: translateX(-50%) translateY(100px);
  padding: var(--space-3) var(--space-5);
  background-color: var(--color-text);
  color: var(--color-bg);
  border-radius: var(--radius-lg);
  font-size: var(--font-size-sm);
  font-weight: 500;
  box-shadow: var(--shadow-lg);
  z-index: 1100;
  opacity: 0;
  transition: all var(--transition-base);
  pointer-events: none;
}

.toast.show {
  transform: translateX(-50%) translateY(0);
  opacity: 1;
}

.toast.success {
  background-color: #22c55e;
  color: #fff;
}

.toast.error {
  background-color: #ef4444;
  color: #fff;
}

.toast.info {
  background-color: var(--color-primary);
  color: #fff;
}

/* ==================== Shared Empty State ==================== */
.empty-state {
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  padding: var(--space-8) var(--space-4);
  text-align: center;
  color: var(--color-text-muted);
}

.empty-state i {
  font-size: 2.5rem;
  margin-bottom: var(--space-3);
  opacity: 0.4;
}

.empty-state p {
  font-size: var(--font-size-sm);
  font-weight: 500;
  margin-bottom: var(--space-1);
}

.empty-state span {
  font-size: var(--font-size-xs);
  opacity: 0.8;
}

/* ==================== Shared Shortcuts Hint ==================== */
.shortcuts-hint {
  position: fixed;
  bottom: 20px;
  right: 20px;
  padding: var(--space-2) var(--space-3);
  background-color: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-full);
  box-shadow: var(--shadow-md);
  font-size: var(--font-size-xs);
  color: var(--color-text-muted);
  opacity: 0.8;
  transition: all var(--transition-fast);
  z-index: 100;
  cursor: pointer;
}

.shortcuts-hint:hover {
  opacity: 1;
}

.shortcuts-hint kbd {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  min-width: 20px;
  height: 20px;
  padding: 0 var(--space-1);
  margin-left: var(--space-1);
  font-size: 0.65rem;
  font-family: inherit;
  font-weight: 600;
  color: var(--color-text);
  background-color: var(--color-bg);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-xs);
}

/* ==================== Shortcuts Modal ==================== */
.shortcuts-modal {
  display: none;
  position: fixed;
  inset: 0;
  background-color: rgba(0, 0, 0, 0.5);
  z-index: 1100;
  align-items: center;
  justify-content: center;
  padding: var(--space-4);
  backdrop-filter: blur(4px);
}

.shortcuts-modal.show {
  display: flex;
}

.shortcuts-modal .shortcuts-content {
  background-color: var(--color-surface);
  border-radius: var(--radius-xl);
  box-shadow: var(--shadow-xl);
  max-width: 520px;
  width: 100%;
  border: 1px solid var(--color-border);
  overflow: hidden;
}

.shortcuts-modal .shortcuts-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: var(--space-4) var(--space-5);
  background-color: var(--color-bg);
  border-bottom: 1px solid var(--color-border);
}

.shortcuts-modal .shortcuts-header h3 {
  display: flex;
  align-items: center;
  gap: var(--space-3);
  font-size: var(--font-size-lg);
  font-weight: 600;
  color: var(--color-text);
}

.shortcuts-modal .shortcuts-header h3 i {
  color: var(--color-primary);
}

.shortcuts-modal .close-shortcuts-btn {
  width: 32px;
  height: 32px;
  display: flex;
  align-items: center;
  justify-content: center;
  background: none;
  border: none;
  color: var(--color-text-secondary);
  cursor: pointer;
  border-radius: var(--radius-md);
  transition: all var(--transition-fast);
}

.shortcuts-modal .close-shortcuts-btn:hover {
  background-color: var(--color-bg-tertiary);
  color: var(--color-text);
}

/* Shortcuts Body */
.shortcuts-body {
  padding: var(--space-3) var(--space-4);
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: var(--space-3);
}

/* Shortcuts Group */
.shortcuts-group {
  display: flex;
  flex-direction: column;
  gap: var(--space-1);
}

.shortcuts-group-title {
  font-size: 0.65rem;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.5px;
  color: var(--color-primary);
  padding-bottom: var(--space-1);
  border-bottom: 1px solid var(--color-border);
  margin-bottom: var(--space-1);
}

/* Shortcut Row */
.shortcut-row {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: var(--space-2);
  padding: 6px 10px;
  background-color: var(--color-bg);
  border-radius: var(--radius-sm);
  transition: background-color var(--transition-fast);
}

.shortcut-row:hover {
  background-color: var(--color-bg-secondary);
}

/* Shortcut Keys */
.shortcut-keys {
  display: flex;
  align-items: center;
  gap: 2px;
  flex-shrink: 0;
}

.shortcut-keys kbd {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  min-width: 22px;
  height: 22px;
  padding: 0 6px;
  font-size: 0.65rem;
  font-weight: 600;
  font-family: inherit;
  color: var(--color-text);
  background: linear-gradient(180deg, var(--color-surface) 0%, var(--color-bg-secondary) 100%);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-xs);
  box-shadow: 0 1px 0 var(--color-border);
}

.key-separator,
.key-plus {
  font-size: 0.6rem;
  color: var(--color-text-muted);
  font-weight: 500;
}

/* Shortcut Description */
.shortcut-desc {
  font-size: var(--font-size-xs);
  color: var(--color-text-secondary);
  text-align: right;
  white-space: nowrap;
}

/* Responsive for Shortcuts Modal */
@media screen and (max-width: 540px) {
  .shortcuts-body {
    grid-template-columns: 1fr;
    padding: var(--space-3);
    gap: var(--space-3);
  }

  .shortcuts-modal .shortcuts-header {
    padding: var(--space-3) var(--space-4);
  }

  .shortcuts-modal .shortcuts-header h3 {
    font-size: var(--font-size-base);
  }

  .shortcut-row {
    padding: var(--space-2);
  }

  .shortcut-keys kbd {
    min-width: 24px;
    height: 24px;
    font-size: 0.65rem;
  }

  .shortcut-desc {
    font-size: var(--font-size-xs);
  }
}

/* ==================== Shared Modal ==================== */
.modal {
  position: fixed;
  inset: 0;
  display: flex;
  align-items: center;
  justify-content: center;
  background-color: rgba(0, 0, 0, 0.5);
  z-index: 1200;
  opacity: 0;
  visibility: hidden;
  transition: all var(--transition-base);
  padding: var(--space-4);
}

.modal.show,
.modal.active {
  opacity: 1;
  visibility: visible;
}

.modal-content {
  width: 100%;
  max-width: 400px;
  background-color: var(--color-surface);
  border-radius: var(--radius-lg);
  box-shadow: var(--shadow-xl);
  overflow: hidden;
  transform: scale(0.9);
  transition: transform var(--transition-base);
}

.modal.show .modal-content,
.modal.active .modal-content {
  transform: scale(1);
}

.modal-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: var(--space-4);
  border-bottom: 1px solid var(--color-border);
}

.modal-header h3 {
  font-size: var(--font-size-lg);
  font-weight: 600;
  color: var(--color-text);
  margin: 0;
}

.modal-close {
  width: 32px;
  height: 32px;
  display: flex;
  align-items: center;
  justify-content: center;
  background-color: var(--color-bg);
  color: var(--color-text-muted);
  border: none;
  border-radius: var(--radius-full);
  cursor: pointer;
  transition: all var(--transition-fast);
}

.modal-close:hover {
  background-color: var(--color-primary);
  color: #fff;
}

.modal-body {
  padding: var(--space-4);
}

.modal-footer {
  display: flex;
  gap: var(--space-3);
  padding: var(--space-4);
  border-top: 1px solid var(--color-border);
}

/* ==================== Search Box ==================== */
.search-container {
  max-width: 500px;
  margin: 0 auto var(--space-8);
  position: relative;
}

.search-input {
  width: 100%;
  padding: var(--space-4) var(--space-6);
  padding-left: var(--space-12);
  font-size: var(--font-size-base);
  font-family: var(--font-family);
  border: 2px solid var(--color-border);
  border-radius: var(--radius-full);
  background-color: var(--color-surface);
  color: var(--color-text);
  transition: all var(--transition-fast);
}

.search-input:focus {
  outline: none;
  border-color: var(--color-primary);
  box-shadow: 0 0 0 4px rgba(55, 118, 161, 0.1);
}

.search-input::placeholder {
  color: var(--color-text-muted);
}

.search-icon {
  position: absolute;
  left: var(--space-5);
  top: 50%;
  transform: translateY(-50%);
  color: var(--color-text-muted);
  font-size: var(--font-size-lg);
  pointer-events: none;
}

.search-clear {
  position: absolute;
  right: var(--space-4);
  top: 50%;
  transform: translateY(-50%);
  width: 28px;
  height: 28px;
  display: none;
  align-items: center;
  justify-content: center;
  background-color: var(--color-bg-tertiary);
  color: var(--color-text-muted);
  border-radius: var(--radius-full);
  transition: all var(--transition-fast);
}

.search-clear.visible {
  display: flex;
}

.search-clear:hover {
  background-color: var(--color-primary);
  color: #fff;
}

/* ==================== Tools Grid ==================== */
.tools-grid {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: var(--space-4);
}

/* ==================== Tool Card ==================== */
.tool-card {
  background-color: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-lg);
  padding: var(--space-4);
  transition: all var(--transition-fast);
  display: flex;
  flex-direction: column;
  text-decoration: none;
}

.tool-card:hover {
  transform: translateY(-3px);
  box-shadow: var(--shadow-md);
  border-color: var(--color-primary-light);
}

.tool-card-icon {
  width: 40px;
  height: 40px;
  display: flex;
  align-items: center;
  justify-content: center;
  background: linear-gradient(135deg, var(--color-primary), var(--color-secondary));
  color: #fff;
  border-radius: var(--radius-md);
  font-size: var(--font-size-base);
  margin-bottom: var(--space-3);
  flex-shrink: 0;
}

.tool-card-body {
  flex: 1;
}

.tool-card-title {
  font-size: var(--font-size-sm);
  font-weight: 600;
  margin-bottom: var(--space-1);
  color: var(--color-text);
}

.tool-card-description {
  font-size: var(--font-size-xs);
  color: var(--color-text-secondary);
  line-height: 1.5;
  margin-bottom: var(--space-3);
  display: -webkit-box;
  -webkit-line-clamp: 2;
  -webkit-box-orient: vertical;
  overflow: hidden;
}

.tool-card-footer {
  display: flex;
  align-items: center;
  justify-content: space-between;
  margin-top: auto;
}

.tool-card-category {
  font-size: var(--font-size-xs);
  color: var(--color-primary);
  background-color: rgba(55, 118, 161, 0.1);
  padding: var(--space-1) var(--space-2);
  border-radius: var(--radius-sm);
  font-weight: 500;
}

.tool-card-arrow {
  width: 24px;
  height: 24px;
  display: flex;
  align-items: center;
  justify-content: center;
  background-color: var(--color-bg-secondary);
  color: var(--color-text-muted);
  border-radius: var(--radius-full);
  font-size: var(--font-size-xs);
  transition: all var(--transition-fast);
}

.tool-card:hover .tool-card-arrow {
  background-color: var(--color-primary);
  color: #fff;
  transform: translateX(2px);
}

/* ==================== Coming Soon ==================== */
.tool-card.coming-soon {
  opacity: 0.6;
  cursor: not-allowed;
}

.tool-card.coming-soon:hover {
  transform: none;
  box-shadow: none;
}

.tool-card.coming-soon .tool-card-icon {
  background: var(--color-bg-tertiary);
  color: var(--color-text-muted);
}

.coming-soon-badge {
  font-size: var(--font-size-xs);
  color: var(--color-text-muted);
  background-color: var(--color-bg-tertiary);
  padding: var(--space-1) var(--space-2);
  border-radius: var(--radius-sm);
  font-weight: 500;
}

/* ==================== No Results ==================== */
.no-results {
  text-align: center;
  padding: var(--space-16) var(--space-6);
  color: var(--color-text-muted);
  display: none;
}

.no-results.visible {
  display: block;
}

.no-results i {
  font-size: 3rem;
  margin-bottom: var(--space-4);
  opacity: 0.5;
}

.no-results h3 {
  font-size: var(--font-size-xl);
  color: var(--color-text-secondary);
  margin-bottom: var(--space-2);
}

/* ==================== Pagination ==================== */
.pagination {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: var(--space-3);
  margin-top: var(--space-8);
}

.pagination:empty {
  display: none;
}

.pagination-buttons {
  display: flex;
  justify-content: center;
  align-items: center;
  gap: var(--space-2);
  flex-wrap: wrap;
}

.pagination-btn {
  min-width: 40px;
  height: 40px;
  display: flex;
  align-items: center;
  justify-content: center;
  padding: 0 var(--space-3);
  font-size: var(--font-size-sm);
  font-weight: 500;
  color: var(--color-text-secondary);
  background-color: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-md);
  transition: all var(--transition-fast);
}

.pagination-btn:hover:not(:disabled) {
  color: var(--color-primary);
  border-color: var(--color-primary);
  background-color: rgba(55, 118, 161, 0.05);
}

.pagination-btn.active {
  color: #fff;
  background-color: var(--color-primary);
  border-color: var(--color-primary);
}

.pagination-btn:disabled {
  opacity: 0.4;
  cursor: not-allowed;
}

.pagination-info {
  font-size: var(--font-size-sm);
  color: var(--color-text-muted);
  text-align: center;
}

/* ==================== About Modal ==================== */
body.modal-open {
  overflow: hidden;
  position: fixed;
  width: 100%;
  height: 100%;
}

.about-modal {
  position: fixed;
  inset: 0;
  z-index: 1000;
  display: flex;
  align-items: center;
  justify-content: center;
  padding: var(--space-4);
  opacity: 0;
  visibility: hidden;
  transition: all var(--transition-normal);
  overflow-y: auto;
}

.about-modal.active {
  opacity: 1;
  visibility: visible;
}

.about-overlay {
  position: absolute;
  inset: 0;
  background-color: rgba(0, 0, 0, 0.6);
  backdrop-filter: blur(4px);
}

.about-content {
  position: relative;
  width: 100%;
  max-width: 560px;
  max-height: 90vh;
  overflow-y: auto;
  background-color: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-xl);
  box-shadow: var(--shadow-xl);
  transform: scale(0.9) translateY(20px);
  transition: transform var(--transition-normal);
}

.about-modal.active .about-content {
  transform: scale(1) translateY(0);
}

.about-close {
  position: absolute;
  top: var(--space-4);
  right: var(--space-4);
  width: 36px;
  height: 36px;
  display: flex;
  align-items: center;
  justify-content: center;
  background-color: var(--color-bg-secondary);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-full);
  color: var(--color-text-secondary);
  cursor: pointer;
  transition: all var(--transition-fast);
  z-index: 1;
}

.about-close:hover {
  background-color: var(--color-danger);
  border-color: var(--color-danger);
  color: white;
}

.about-header {
  padding: var(--space-6) var(--space-6) var(--space-4);
  text-align: center;
  border-bottom: 1px solid var(--color-border);
}

.about-logo {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: var(--space-2);
  margin-bottom: var(--space-3);
}

.about-logo .logo-text {
  font-size: var(--font-size-xl);
  font-weight: 800;
  color: var(--color-text);
}

.about-logo .logo-divider {
  color: var(--color-text-muted);
  font-weight: 300;
}

.about-logo .logo-tools {
  font-size: var(--font-size-xl);
  font-weight: 600;
  color: var(--color-primary);
}

.about-tagline {
  font-size: var(--font-size-sm);
  color: var(--color-text-secondary);
}

.about-body {
  padding: var(--space-5) var(--space-6);
}

.about-section {
  margin-bottom: var(--space-5);
}

.about-section:last-child {
  margin-bottom: 0;
}

.about-section h3 {
  display: flex;
  align-items: center;
  gap: var(--space-2);
  font-size: var(--font-size-base);
  font-weight: 600;
  color: var(--color-text);
  margin-bottom: var(--space-3);
}

.about-section h3 i {
  color: var(--color-primary);
  font-size: var(--font-size-sm);
}

.about-section p {
  font-size: var(--font-size-sm);
  color: var(--color-text-secondary);
  line-height: 1.6;
}

.about-features {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: var(--space-2);
  list-style: none;
  padding: 0;
  margin: 0;
}

.about-features li {
  display: flex;
  align-items: center;
  gap: var(--space-2);
  font-size: var(--font-size-sm);
  color: var(--color-text-secondary);
  padding: var(--space-2) var(--space-3);
  background-color: var(--color-bg-secondary);
  border-radius: var(--radius-md);
}

.about-features li i {
  color: var(--color-success);
  font-size: var(--font-size-xs);
}

.about-categories {
  display: flex;
  flex-wrap: wrap;
  gap: var(--space-2);
}

.about-category {
  display: inline-flex;
  align-items: center;
  gap: var(--space-2);
  padding: var(--space-2) var(--space-3);
  font-size: var(--font-size-sm);
  color: var(--color-text);
  background-color: var(--color-bg-secondary);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-full);
}

.about-category i {
  color: var(--color-primary);
  font-size: var(--font-size-xs);
}

.about-links {
  display: flex;
  flex-wrap: wrap;
  gap: var(--space-2);
  margin-top: var(--space-3);
}

.about-link-btn {
  display: inline-flex;
  align-items: center;
  gap: var(--space-2);
  padding: var(--space-2) var(--space-4);
  font-size: var(--font-size-sm);
  font-weight: 500;
  color: var(--color-text);
  background-color: var(--color-bg-secondary);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-md);
  text-decoration: none;
  transition: all var(--transition-fast);
}

.about-link-btn:hover {
  color: var(--color-primary);
  border-color: var(--color-primary);
  background-color: rgba(55, 118, 161, 0.05);
}

.about-link-btn i {
  font-size: var(--font-size-base);
}

.about-footer {
  padding: var(--space-4) var(--space-6);
  text-align: center;
  border-top: 1px solid var(--color-border);
  background-color: var(--color-bg-secondary);
}

.about-footer p {
  font-size: var(--font-size-sm);
  color: var(--color-text-muted);
  margin: 0;
}

/* ==================== Footer ==================== */
.footer {
  background-color: var(--color-bg-secondary);
  padding: var(--space-6) 0;
  border-top: 1px solid var(--color-border);
  margin-top: auto;
}

.footer-bottom {
  display: flex;
  justify-content: space-between;
  align-items: center;
}

.footer-copy {
  font-size: var(--font-size-sm);
  color: var(--color-text-muted);
}

.footer-made {
  font-size: var(--font-size-sm);
  color: var(--color-text-muted);
}

.footer-made .fa-heart {
  color: #ef4444;
}

/* ==================== Overlay ==================== */
.nav-overlay {
  position: fixed;
  top: 0;
  left: 0;
  width: 30%;
  height: 100%;
  height: 100dvh;
  background-color: rgba(0, 0, 0, 0.5);
  backdrop-filter: blur(2px);
  opacity: 0;
  visibility: hidden;
  transition: opacity var(--transition-base), visibility var(--transition-base);
  z-index: 1099;
  cursor: pointer;
}

.nav-overlay.active {
  opacity: 1;
  visibility: visible;
}

/* ==================== Selection & Focus ==================== */
::selection {
  background-color: var(--color-primary);
  color: #fff;
}

:focus-visible {
  outline: 2px solid var(--color-primary);
  outline-offset: 2px;
}

/* ==================== Responsive - Large Tablet ==================== */
@media screen and (max-width: 1024px) {
  .tools-grid {
    grid-template-columns: repeat(3, 1fr);
  }

  .tool-wrapper {
    max-width: 100%;
  }
}

/* ==================== Responsive - Tablet ==================== */
@media screen and (max-width: 768px) {
  /* Shared Tool Components */
  .tool-page {
    padding-top: 80px;
  }

  .tool-page .container {
    padding-left: var(--space-3);
    padding-right: var(--space-3);
  }

  .tool-wrapper {
    border-radius: var(--radius-lg);
  }

  .tool-header {
    padding: var(--space-3) var(--space-4);
  }

  .tool-header h2 {
    font-size: var(--font-size-lg);
  }

  .tool-tabs {
    overflow-x: auto;
  }

  .tool-tab {
    padding: var(--space-3);
  }

  .tool-tab span {
    display: none;
  }

  .tool-content,
  .tool-panel {
    padding: var(--space-4);
  }

  .btn span {
    display: none;
  }

  .btn-lg,
  .btn-xl {
    padding: var(--space-3);
  }

  .form-input,
  .form-textarea,
  .form-select {
    padding: var(--space-2) var(--space-3);
    font-size: var(--font-size-sm);
  }

  .tool-section-header {
    padding: var(--space-2) var(--space-3);
  }

  .tool-section-content {
    padding: var(--space-3);
  }

  .shortcuts-hint {
    display: none;
  }

  .modal-content {
    max-width: 100%;
    margin: var(--space-4);
  }

  .nav-menu {
    position: fixed;
    top: 0;
    right: -100%;
    width: 70%;
    max-width: 280px;
    height: 100vh;
    height: 100dvh;
    background-color: var(--color-bg);
    padding: var(--space-16) var(--space-5);
    box-shadow: -4px 0 20px rgba(0, 0, 0, 0.15);
    transition: right var(--transition-base);
    z-index: 1100;
  }

  .nav-menu.active {
    right: 0;
  }

  .nav-list {
    flex-direction: column;
    gap: 0;
    width: 100%;
  }

  .nav-item {
    width: 100%;
  }

  .nav-link {
    display: flex;
    align-items: center;
    justify-content: space-between;
    width: 100%;
    padding: var(--space-3) var(--space-4);
    font-size: var(--font-size-base);
    border-radius: var(--radius-md);
    transition: background-color var(--transition-fast);
  }

  .nav-link:hover {
    background-color: var(--color-bg-tertiary);
  }

  .nav-link.active {
    background-color: rgba(55, 118, 161, 0.1);
  }

  .nav-link::after {
    display: none;
  }

  .nav-count {
    margin-left: auto;
  }

  .nav-close {
    display: flex;
    align-items: center;
    justify-content: center;
    position: absolute;
    top: var(--space-4);
    right: var(--space-4);
    width: 44px;
    height: 44px;
    font-size: var(--font-size-xl);
    color: var(--color-text);
    background-color: var(--color-bg-secondary);
    border-radius: var(--radius-lg);
  }

  .nav-toggle {
    display: flex;
  }

  .logo-text {
    font-size: var(--font-size-sm);
  }

  .logo-tools {
    font-size: var(--font-size-sm);
  }

  .tools-page {
    padding-top: 80px;
  }

  .nav-item-divider {
    width: 100%;
    height: 1px;
    background-color: var(--color-border);
    margin: var(--space-3) 0;
  }

  .search-input {
    padding: var(--space-3) var(--space-4);
    padding-left: var(--space-10);
    font-size: var(--font-size-sm);
  }

  .search-icon {
    left: var(--space-4);
    font-size: var(--font-size-base);
  }

  .search-container {
    margin-top: var(--space-4);
    margin-bottom: var(--space-4);
  }

  .tools-grid {
    grid-template-columns: repeat(2, 1fr);
    gap: var(--space-3);
  }

  .tool-card {
    padding: var(--space-3);
  }

  .tool-card-icon {
    width: 36px;
    height: 36px;
    font-size: var(--font-size-sm);
  }

  .tool-card-title {
    font-size: var(--font-size-xs);
  }

  .tool-card-description {
    -webkit-line-clamp: 2;
    font-size: 0.7rem;
  }

  .tool-card-category,
  .coming-soon-badge {
    font-size: 0.65rem;
    padding: 2px 6px;
  }

  .tool-card-arrow {
    width: 20px;
    height: 20px;
    font-size: 0.6rem;
  }

  .footer {
    padding: var(--space-3) 0;
  }

  .footer-bottom {
    flex-direction: column;
    gap: var(--space-1);
    text-align: center;
  }

  .footer-copy,
  .footer-made {
    font-size: var(--font-size-xs);
  }

  .pagination {
    gap: var(--space-2);
  }

  .pagination-buttons {
    gap: var(--space-1);
  }

  .pagination-btn {
    min-width: 36px;
    height: 36px;
    padding: 0 var(--space-2);
    font-size: var(--font-size-xs);
  }

  .pagination-info {
    font-size: var(--font-size-xs);
  }

  .nav-overlay {
    width: 30%;
  }

  /* About Modal Mobile */
  .about-modal {
    padding: var(--space-3);
  }

  .about-content {
    max-height: 85vh;
  }

  .about-header {
    padding: var(--space-5) var(--space-4) var(--space-3);
  }

  .about-logo .logo-text,
  .about-logo .logo-tools {
    font-size: var(--font-size-lg);
  }

  .about-body {
    padding: var(--space-4);
  }

  .about-features {
    grid-template-columns: 1fr;
  }

  .about-links {
    flex-direction: column;
  }

  .about-link-btn {
    justify-content: center;
  }

  .about-footer {
    padding: var(--space-3) var(--space-4);
  }
}

/* ==================== Responsive - Small Mobile ==================== */
@media screen and (max-width: 480px) {
  /* Shared Tool Components */
  .tool-page .container {
    padding-left: var(--space-2);
    padding-right: var(--space-2);
  }

  .tool-header {
    padding: var(--space-3);
  }

  .tool-header h2 {
    font-size: var(--font-size-base);
    gap: var(--space-2);
  }

  .tool-content,
  .tool-panel {
    padding: var(--space-3);
  }

  .tool-section-content {
    padding: var(--space-2);
  }

  .btn-icon,
  .btn-icon-sm {
    width: 32px;
    height: 32px;
  }

  .empty-state {
    padding: var(--space-6) var(--space-3);
  }

  .empty-state i {
    font-size: 2rem;
  }

  .modal-header,
  .modal-body,
  .modal-footer {
    padding: var(--space-3);
  }

  .tools-grid {
    grid-template-columns: 1fr;
  }

  .tool-card {
    flex-direction: row;
    align-items: center;
    gap: var(--space-3);
  }

  .tool-card-icon {
    margin-bottom: 0;
  }

  .tool-card-description {
    margin-bottom: 0;
    -webkit-line-clamp: 1;
  }

  .tool-card-footer {
    display: none;
  }
}

@media screen and (max-width: 360px) {
  .logo-text {
    font-size: var(--font-size-xs);
  }

  .logo-divider,
  .logo-tools {
    display: none;
  }

  .nav-overlay {
    width: 15%;
  }
}