/* ============================================
   Shared Design System (shadcn/ui inspired)
   ============================================ */

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

/* Tokens */
:root {
  --background: 0 0% 100%;
  --foreground: 0 0% 3.9%;
  --card: 0 0% 100%;
  --card-foreground: 0 0% 3.9%;
  --muted: 0 0% 96.1%;
  --muted-foreground: 0 0% 45.1%;
  --border: 0 0% 89.8%;
  --input: 0 0% 89.8%;
  --primary: 0 0% 9%;
  --primary-foreground: 0 0% 98%;
  --secondary: 0 0% 96.1%;
  --secondary-foreground: 0 0% 9%;
  --accent: 0 0% 96.1%;
  --accent-foreground: 0 0% 9%;
  --destructive: 0 84.2% 60.2%;
  --ring: 0 0% 3.9%;
  --radius: 0.5rem;
}

/* Base */
body {
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "Helvetica Neue", Arial, sans-serif;
  background-color: hsl(var(--background));
  color: hsl(var(--foreground));
  line-height: 1.5;
  min-height: 100vh;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}

/* Layout */
.container {
  width: 100%;
  max-width: 48rem;
  margin: 0 auto;
  padding: 1.5rem 1rem;
}

@media (min-width: 640px) {
  .container {
    padding: 2rem 1.5rem;
  }
}

/* Typography */
h1 {
  font-size: 1.5rem;
  font-weight: 600;
  letter-spacing: -0.025em;
  margin-bottom: 0.5rem;
}

@media (min-width: 640px) {
  h1 {
    font-size: 1.875rem;
  }
}

h2 {
  font-size: 1.25rem;
  font-weight: 600;
  letter-spacing: -0.025em;
  margin-bottom: 0.5rem;
}

.subtitle {
  color: hsl(var(--muted-foreground));
  font-size: 0.875rem;
}

/* Card */
.card {
  background-color: hsl(var(--card));
  border: 1px solid hsl(var(--border));
  border-radius: var(--radius);
  padding: 1.5rem;
  margin-bottom: 1.5rem;
}

.card-title {
  font-size: 1rem;
  font-weight: 600;
  margin-bottom: 0.5rem;
}

.card-description {
  font-size: 0.875rem;
  color: hsl(var(--muted-foreground));
}

/* Buttons */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 0.5rem;
  height: 2.5rem;
  padding: 0 1rem;
  font-size: 0.875rem;
  font-weight: 500;
  border: none;
  border-radius: var(--radius);
  cursor: pointer;
  transition: all 0.2s;
  text-decoration: none;
}

.btn-primary {
  background-color: hsl(var(--primary));
  color: hsl(var(--primary-foreground));
}

.btn-primary:hover:not(:disabled) {
  opacity: 0.9;
}

.btn-primary:disabled {
  opacity: 0.5;
  cursor: not-allowed;
}

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

.btn-secondary:hover {
  background-color: hsl(var(--accent));
}

.btn-icon {
  width: 2rem;
  height: 2rem;
  padding: 0;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  background: transparent;
  border: 1px solid hsl(var(--border));
  border-radius: var(--radius);
  cursor: pointer;
  transition: all 0.2s;
}

.btn-icon:hover {
  background-color: hsl(var(--muted));
}

.btn-icon svg {
  width: 1rem;
  height: 1rem;
}

/* Forms */
.form-group {
  display: flex;
  flex-direction: column;
  gap: 0.5rem;
}

label {
  font-size: 0.875rem;
  font-weight: 500;
}

input[type="text"],
input[type="email"],
input[type="password"],
input[type="number"],
select,
textarea {
  width: 100%;
  height: 2.5rem;
  padding: 0 0.75rem;
  font-size: 0.875rem;
  border: 1px solid hsl(var(--input));
  border-radius: var(--radius);
  background-color: hsl(var(--background));
  color: hsl(var(--foreground));
  outline: none;
  transition: border-color 0.2s, box-shadow 0.2s;
}

textarea {
  height: auto;
  min-height: 5rem;
  padding: 0.75rem;
  resize: vertical;
}

input:focus,
select:focus,
textarea:focus {
  border-color: hsl(var(--ring));
  box-shadow: 0 0 0 2px hsla(var(--ring), 0.1);
}

/* Drop Zone */
.drop-zone {
  border: 2px dashed hsl(var(--border));
  border-radius: var(--radius);
  padding: 2rem 1rem;
  text-align: center;
  cursor: pointer;
  transition: all 0.2s ease;
  background-color: hsl(var(--muted));
}

.drop-zone:hover,
.drop-zone.drag-over {
  border-color: hsl(var(--foreground));
  background-color: hsl(var(--accent));
}

.drop-zone-icon {
  width: 3rem;
  height: 3rem;
  margin: 0 auto 1rem;
  color: hsl(var(--muted-foreground));
}

.drop-zone-text {
  font-size: 0.875rem;
  color: hsl(var(--muted-foreground));
  margin-bottom: 0.5rem;
}

.drop-zone-hint {
  font-size: 0.75rem;
  color: hsl(var(--muted-foreground));
}

/* Progress */
.progress-bar {
  width: 100%;
  height: 0.5rem;
  background-color: hsl(var(--muted));
  border-radius: 9999px;
  overflow: hidden;
}

.progress-fill {
  height: 100%;
  background-color: hsl(var(--primary));
  transition: width 0.3s ease;
}

.progress-text {
  font-size: 0.75rem;
  color: hsl(var(--muted-foreground));
  margin-top: 0.5rem;
  text-align: center;
}

/* Utilities */
.hidden {
  display: none !important;
}

.text-muted {
  color: hsl(var(--muted-foreground));
}

.text-sm {
  font-size: 0.875rem;
}

.text-xs {
  font-size: 0.75rem;
}

.mt-1 { margin-top: 0.25rem; }
.mt-2 { margin-top: 0.5rem; }
.mt-4 { margin-top: 1rem; }
.mb-1 { margin-bottom: 0.25rem; }
.mb-2 { margin-bottom: 0.5rem; }
.mb-4 { margin-bottom: 1rem; }

.spinner {
  width: 1rem;
  height: 1rem;
  border: 2px solid hsl(var(--primary-foreground));
  border-top-color: transparent;
  border-radius: 50%;
  animation: spin 0.8s linear infinite;
}

@keyframes spin {
  to { transform: rotate(360deg); }
}

/* Grid for tools listing */
.tools-grid {
  display: grid;
  gap: 1rem;
}

@media (min-width: 640px) {
  .tools-grid {
    grid-template-columns: repeat(2, 1fr);
  }
}

.tool-card {
  display: block;
  padding: 1.25rem;
  background-color: hsl(var(--card));
  border: 1px solid hsl(var(--border));
  border-radius: var(--radius);
  text-decoration: none;
  color: inherit;
  transition: all 0.2s;
}

.tool-card:hover {
  border-color: hsl(var(--foreground));
  transform: translateY(-2px);
}

.tool-card-title {
  font-weight: 600;
  margin-bottom: 0.25rem;
}

.tool-card-description {
  font-size: 0.875rem;
  color: hsl(var(--muted-foreground));
}