/**
 * Reusable Component Styles
 * Responsive, accessible UI components following design system
 */

/* Layout Components */
.container {
  width: 100%;
  max-width: 1200px;
  margin: 0 auto;
  padding: 0 var(--space-4);
}

.container--narrow {
  max-width: 800px;
}

.container--wide {
  max-width: 1400px;
}

/* Grid System */
.grid {
  display: grid;
  gap: var(--space-4);
}

.grid--2 {
  grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
}

.grid--3 {
  grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
}

.grid--4 {
  grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
}

/* Flexbox Utilities */
.flex {
  display: flex;
}

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

.flex--center {
  align-items: center;
  justify-content: center;
}

.flex--between {
  justify-content: space-between;
}

.flex--around {
  justify-content: space-around;
}

.flex--wrap {
  flex-wrap: wrap;
}

/* Button Components */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  padding: var(--space-3) var(--space-5);
  font-family: inherit;
  font-size: var(--font-size-base);
  font-weight: 500;
  line-height: 1;
  text-decoration: none;
  border: 1px solid transparent;
  border-radius: var(--radius-md);
  cursor: pointer;
  transition: all var(--transition-fast);
  min-height: 44px; /* Accessibility: minimum touch target */
  min-width: 44px;
  gap: var(--space-2);
}

.btn:focus {
  outline: 2px solid var(--color-focus);
  outline-offset: 2px;
}

.btn:disabled {
  opacity: 0.6;
  cursor: not-allowed;
  pointer-events: none;
}

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

.btn--primary:hover:not(:disabled) {
  background-color: var(--color-button-primary-hover-bg);
  border-color: var(--color-button-primary-hover-border);
  transform: translateY(-1px);
  box-shadow: var(--shadow-md);
}

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

.btn--secondary:hover:not(:disabled) {
  background-color: var(--color-button-secondary-hover-bg);
  border-color: var(--color-button-secondary-hover-border);
  transform: translateY(-1px);
  box-shadow: var(--shadow-md);
}

.btn--outline {
  background-color: transparent;
  color: var(--color-accent);
  border-color: var(--color-accent);
}

.btn--outline:hover:not(:disabled) {
  background-color: var(--color-accent);
  color: var(--color-text-inverse);
}

.btn--ghost {
  background-color: transparent;
  color: var(--color-text-primary);
  border-color: transparent;
}

.btn--ghost:hover:not(:disabled) {
  background-color: var(--color-hover-bg);
}

.btn--small {
  padding: var(--space-2) var(--space-3);
  font-size: var(--font-size-sm);
  min-height: 36px;
  min-width: 36px;
}

.btn--large {
  padding: var(--space-4) var(--space-6);
  font-size: var(--font-size-lg);
  min-height: 52px;
  min-width: 52px;
}

/* Input Components */
.input {
  width: 100%;
  padding: var(--space-3) var(--space-4);
  font-family: inherit;
  font-size: var(--font-size-base);
  line-height: var(--line-height-normal);
  color: var(--color-input-text);
  background-color: var(--color-input-bg);
  border: 1px solid var(--color-input-border);
  border-radius: var(--radius-md);
  transition: all var(--transition-fast);
  min-height: 44px; /* Accessibility: minimum touch target */
}

.input:focus {
  outline: 2px solid var(--color-focus);
  outline-offset: 2px;
  border-color: var(--color-input-border-focus);
  box-shadow: 0 0 0 3px var(--color-focus-ring);
}

.input:disabled {
  opacity: 0.6;
  cursor: not-allowed;
  background-color: var(--color-bg-tertiary);
}

.input::placeholder {
  color: var(--color-input-placeholder);
  opacity: 1;
}

.input--error {
  border-color: var(--color-error);
  box-shadow: 0 0 0 3px rgba(220, 53, 69, 0.1);
}

.input--success {
  border-color: var(--color-success);
  box-shadow: 0 0 0 3px rgba(25, 135, 84, 0.1);
}

.textarea {
  resize: vertical;
  min-height: 120px;
  font-family: var(--font-family-mono);
}

/* Form Groups */
.form-group {
  margin-bottom: var(--space-5);
}

.form-label {
  display: block;
  margin-bottom: var(--space-2);
  font-weight: 500;
  color: var(--color-text-primary);
}

.form-label--required::after {
  content: ' *';
  color: var(--color-error);
}

.form-help {
  margin-top: var(--space-1);
  font-size: var(--font-size-sm);
  color: var(--color-text-secondary);
}

.form-error {
  margin-top: var(--space-1);
  font-size: var(--font-size-sm);
  color: var(--color-error);
  display: flex;
  align-items: center;
  gap: var(--space-1);
}

/* Card Components */
.card {
  background-color: var(--color-bg-primary);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-lg);
  box-shadow: var(--shadow-sm);
  overflow: hidden;
  transition: all var(--transition-fast);
}

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

.card__header {
  padding: var(--space-5) var(--space-6);
  border-bottom: 1px solid var(--color-border);
  background-color: var(--color-bg-secondary);
}

.card__title {
  margin: 0;
  font-size: var(--font-size-lg);
  font-weight: 600;
  color: var(--color-text-primary);
}

.card__body {
  padding: var(--space-6);
}

.card__footer {
  padding: var(--space-4) var(--space-6);
  border-top: 1px solid var(--color-border);
  background-color: var(--color-bg-secondary);
}

/* Alert Components */
.alert {
  padding: var(--space-4);
  border-radius: var(--radius-md);
  border: 1px solid transparent;
  margin-bottom: var(--space-4);
  display: flex;
  align-items: flex-start;
  gap: var(--space-3);
}

.alert__icon {
  flex-shrink: 0;
  width: 20px;
  height: 20px;
  margin-top: 2px;
}

.alert__content {
  flex: 1;
}

.alert__title {
  margin: 0 0 var(--space-1) 0;
  font-weight: 600;
  font-size: var(--font-size-base);
}

.alert__message {
  margin: 0;
  font-size: var(--font-size-sm);
}

.alert--success {
  background-color: var(--color-success-light);
  border-color: var(--color-success);
  color: var(--color-success-dark);
}

.alert--warning {
  background-color: var(--color-warning-light);
  border-color: var(--color-warning);
  color: var(--color-warning-dark);
}

.alert--error {
  background-color: var(--color-error-light);
  border-color: var(--color-error);
  color: var(--color-error-dark);
}

.alert--info {
  background-color: var(--color-info-light);
  border-color: var(--color-info);
  color: var(--color-info-dark);
}

/* Loading States */
.loading {
  display: inline-flex;
  align-items: center;
  gap: var(--space-2);
}

.spinner {
  width: 20px;
  height: 20px;
  border: 2px solid var(--color-border);
  border-top: 2px solid var(--color-accent);
  border-radius: 50%;
  animation: spin 1s linear infinite;
}

@keyframes spin {
  0% { transform: rotate(0deg); }
  100% { transform: rotate(360deg); }
}

/* Responsive Utilities */
@media (max-width: 640px) {
  .container {
    padding: 0 var(--space-3);
  }
  
  .btn {
    width: 100%;
    justify-content: center;
  }
  
  .btn--small {
    width: auto;
    min-width: 44px;
  }
  
  .grid--2,
  .grid--3,
  .grid--4 {
    grid-template-columns: 1fr;
  }
  
  .card__header,
  .card__body,
  .card__footer {
    padding: var(--space-4);
  }
}

@media (max-width: 480px) {
  .container {
    padding: 0 var(--space-2);
  }
  
  .btn {
    padding: var(--space-3) var(--space-4);
    font-size: var(--font-size-sm);
  }
  
  .input,
  .textarea {
    padding: var(--space-2) var(--space-3);
    font-size: var(--font-size-sm);
  }
}

/* Focus Management */
.focus-trap {
  position: relative;
}

.focus-trap::before,
.focus-trap::after {
  content: '';
  position: absolute;
  width: 1px;
  height: 1px;
  opacity: 0;
  pointer-events: none;
}

/* Accessibility Helpers */
.sr-only {
  position: absolute !important;
  width: 1px !important;
  height: 1px !important;
  padding: 0 !important;
  margin: -1px !important;
  overflow: hidden !important;
  clip: rect(0, 0, 0, 0) !important;
  white-space: nowrap !important;
  border: 0 !important;
}

.sr-only-focusable:focus {
  position: static !important;
  width: auto !important;
  height: auto !important;
  padding: inherit !important;
  margin: inherit !important;
  overflow: visible !important;
  clip: auto !important;
  white-space: normal !important;
}

/* High contrast mode adjustments */
@media (prefers-contrast: high) {
  .btn {
    border: 2px solid currentColor;
  }
  
  .input {
    border: 2px solid currentColor;
  }
  
  .card {
    border: 2px solid currentColor;
  }
}

/* ========================================
   MODERN HEADER & NAVIGATION - World-Class Design
   ======================================== */
.header {
  position: sticky;
  top: 0;
  z-index: var(--z-sticky);
  background: var(--color-surface-glass);
  backdrop-filter: var(--glass-blur);
  -webkit-backdrop-filter: var(--glass-blur);
  border-bottom: 1px solid var(--color-border-light);
  box-shadow: var(--shadow-md);
  transition: all var(--transition-normal);
}

.header .container {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding-top: var(--space-4);
  padding-bottom: var(--space-4);
  gap: var(--space-6);
}

.logo {
  display: flex;
  align-items: center;
  gap: var(--space-3);
  font-size: var(--font-size-2xl);
  font-weight: 700;
  margin: 0;
  transition: transform var(--transition-fast);
  cursor: pointer;
}

.logo:hover {
  transform: translateY(-2px);
}

.logo-icon {
  font-size: 2rem;
  background: var(--color-accent-gradient);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
  animation: float 3s ease-in-out infinite;
}

@keyframes float {
  0%, 100% {
    transform: translateY(0px);
  }
  50% {
    transform: translateY(-5px);
  }
}

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

.nav {
  flex: 1;
  display: flex;
  justify-content: center;
}

.nav-list {
  display: flex;
  align-items: center;
  gap: var(--space-2);
  list-style: none;
  margin: 0;
  padding: 0;
}

.nav-link {
  padding: var(--space-3) var(--space-5);
  color: var(--color-text-secondary);
  font-weight: 500;
  font-size: var(--font-size-base);
  border-radius: var(--radius-lg);
  transition: all var(--transition-fast);
  position: relative;
  overflow: hidden;
}

.nav-link::before {
  content: '';
  position: absolute;
  bottom: 0;
  left: 50%;
  width: 0;
  height: 2px;
  background: var(--color-accent-gradient);
  transition: all var(--transition-normal);
  transform: translateX(-50%);
}

.nav-link:hover {
  color: var(--color-accent);
  background-color: var(--color-accent-light);
  text-decoration: none;
  transform: translateY(-1px);
}

.nav-link:hover::before {
  width: 80%;
}

.nav-link.active {
  color: var(--color-accent);
  background: var(--color-accent-light);
  font-weight: 600;
}

.nav-link.active::before {
  width: 80%;
}

.header-controls {
  display: flex;
  align-items: center;
  gap: var(--space-3);
}

.btn-icon {
  width: 44px;
  height: 44px;
  padding: 0;
  border-radius: 50%;
  background: var(--color-bg-secondary);
  border: 1px solid var(--color-border);
  color: var(--color-text-primary);
  cursor: pointer;
  transition: all var(--transition-fast);
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 1.25rem;
}

.btn-icon:hover {
  background: var(--color-accent);
  color: white;
  transform: rotate(180deg) scale(1.1);
  box-shadow: var(--shadow-glow);
}

.theme-icon {
  transition: transform var(--transition-normal);
}

/* ========================================
   MODERN FOOTER - Professional Design
   ======================================== */
.footer {
  margin-top: auto;
  padding: var(--space-12) 0 var(--space-6);
  background: var(--color-bg-secondary);
  border-top: 1px solid var(--color-border);
  position: relative;
}

.footer::before {
  content: '';
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  height: 1px;
  background: var(--color-accent-gradient);
  opacity: 0.3;
}

.footer .container {
  text-align: center;
}

.footer p {
  color: var(--color-text-secondary);
  margin-bottom: var(--space-4);
  font-size: var(--font-size-sm);
}

.footer-links {
  display: flex;
  justify-content: center;
  gap: var(--space-6);
  flex-wrap: wrap;
  margin-bottom: var(--space-4);
}

.footer-links a {
  color: var(--color-text-muted);
  font-size: var(--font-size-sm);
  font-weight: 500;
  transition: all var(--transition-fast);
  position: relative;
}

.footer-links a::after {
  content: '';
  position: absolute;
  bottom: -2px;
  left: 0;
  width: 0;
  height: 2px;
  background: var(--color-accent-gradient);
  transition: width var(--transition-normal);
}

.footer-links a:hover {
  color: var(--color-accent);
  text-decoration: none;
  transform: translateY(-2px);
}

.footer-links a:hover::after {
  width: 100%;
}

/* ========================================
   MAIN CONTENT AREA - Enhanced Layout
   ======================================== */
.main {
  flex: 1;
  padding: var(--space-12) 0;
  position: relative;
}

.tool-hub {
  max-width: 1200px;
  margin: 0 auto;
}

.tool-header {
  text-align: center;
  margin-bottom: var(--space-12);
  animation: fadeInUp 0.6s ease-out;
}

@keyframes fadeInUp {
  from {
    opacity: 0;
    transform: translateY(20px);
  }
  to {
    opacity: 1;
    transform: translateY(0);
  }
}

.tool-header h2 {
  font-size: var(--font-size-3xl);
  font-weight: 800;
  margin-bottom: var(--space-4);
  background: var(--color-accent-gradient);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
  line-height: 1.2;
}

.tool-header p {
  font-size: var(--font-size-lg);
  color: var(--color-text-secondary);
  max-width: 600px;
  margin: 0 auto;
  line-height: var(--line-height-relaxed);
}

.tool-container {
  animation: fadeInUp 0.8s ease-out 0.2s both;
}

/* ========================================
   ENHANCED RESPONSIVE DESIGN
   ======================================== */
@media (max-width: 768px) {
  .header .container {
    flex-wrap: wrap;
  }
  
  .nav {
    order: 3;
    flex-basis: 100%;
    justify-content: flex-start;
    margin-top: var(--space-3);
  }
  
  .nav-list {
    width: 100%;
    justify-content: space-around;
  }
  
  .nav-link {
    padding: var(--space-2) var(--space-3);
    font-size: var(--font-size-sm);
  }
  
  .logo {
    font-size: var(--font-size-xl);
  }
  
  .tool-header h2 {
    font-size: var(--font-size-2xl);
  }
  
  .tool-header p {
    font-size: var(--font-size-base);
  }
  
  .main {
    padding: var(--space-8) 0;
  }
  
  .footer {
    padding: var(--space-8) 0 var(--space-4);
  }
}

@media (max-width: 480px) {
  .logo-text {
    display: none;
  }
  
  .nav-list {
    gap: var(--space-1);
  }
  
  .footer-links {
    gap: var(--space-4);
  }
}