:root {
    --background: 0 0% 100%;
    --foreground: 240 10% 3.9%;
    --card: 0 0% 100%;
    --card-foreground: 240 10% 3.9%;
    --popover: 0 0% 100%;
    --popover-foreground: 240 10% 3.9%;
    --primary: 240 5.9% 10%;
    --primary-foreground: 0 0% 98%;
    --secondary: 240 4.8% 95.9%;
    --secondary-foreground: 240 5.9% 10%;
    --muted: 240 4.8% 95.9%;
    --muted-foreground: 240 3.8% 46.1%;
    --accent: 240 4.8% 95.9%;
    --accent-foreground: 240 5.9% 10%;
    --destructive: 0 84.2% 60.2%;
    --destructive-foreground: 0 0% 98%;
    --border: 240 5.9% 90%;
    --input: 240 5.9% 90%;
    --ring: 240 5.9% 10%;
    --radius: 0.5rem;
}

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

body {
    font-family: 'Inter', sans-serif;
    background-color: hsl(var(--background));
    color: hsl(var(--foreground));
    min-height: 100vh;
    display: flex;
    align-items: center;
    justify-content: center;
    padding: 1rem;
    -webkit-font-smoothing: antialiased;
}

.container {
    width: 100%;
    max-width: 400px;
}

.card {
    background-color: hsl(var(--card));
    color: hsl(var(--card-foreground));
    border-radius: var(--radius);
    border: 1px solid hsl(var(--border));
    box-shadow: 0 1px 2px 0 rgba(0, 0, 0, 0.05);
}

.card-header {
    padding: 1.5rem 1.5rem 0 1.5rem;
    display: flex;
    flex-direction: column;
    gap: 0.375rem;
}

h1 {
    font-size: 1.5rem;
    font-weight: 600;
    line-height: 1;
    letter-spacing: -0.025em;
}

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

.card-content {
    padding: 1.5rem;
    display: flex;
    flex-direction: column;
    gap: 1rem;
}

.form-item {
    display: flex;
    flex-direction: column;
    gap: 0.5rem;
}

label {
    font-size: 0.875rem;
    font-weight: 500;
    line-height: 1;
}

input {
    height: 2.5rem;
    width: 100%;
    border-radius: calc(var(--radius) - 2px);
    border: 1px solid hsl(var(--input));
    background-color: transparent;
    padding: 0.5rem 0.75rem;
    font-size: 0.875rem;
    transition: all 0.2s;
    outline: none;
    color: hsl(var(--foreground));
}

input:focus {
    outline: 2px solid transparent;
    outline-offset: 2px;
    box-shadow: 0 0 0 2px hsl(var(--background)), 0 0 0 4px hsl(var(--ring));
}

input::placeholder {
    color: hsl(var(--muted-foreground));
}

.card-footer {
    padding: 0 1.5rem 1.5rem 1.5rem;
    display: flex;
    flex-direction: column;
    gap: 0.75rem;
}

.btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    border-radius: calc(var(--radius) - 2px);
    font-size: 0.875rem;
    font-weight: 500;
    height: 2.5rem;
    padding: 0 1rem;
    cursor: pointer;
    transition: all 0.2s;
    outline: none;
    gap: 0.5rem;
}

.btn:focus-visible {
    outline: 2px solid transparent;
    outline-offset: 2px;
    box-shadow: 0 0 0 2px hsl(var(--background)), 0 0 0 4px hsl(var(--ring));
}

.btn-primary {
    background-color: hsl(var(--primary));
    color: hsl(var(--primary-foreground));
    border: none;
}

.btn-primary:hover {
    background-color: hsl(var(--primary) / 0.9);
}

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

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

.result-area {
    margin-top: 0.5rem;
    text-align: center;
    animation: slideDown 0.2s ease-out;
}

.code-display {
    font-family: 'Inter', monospace;
    font-size: 1.5rem;
    font-weight: 700;
    letter-spacing: 0.05em;
    padding: 1rem;
    background-color: hsl(var(--secondary));
    border-radius: var(--radius);
    color: hsl(var(--secondary-foreground));
    border: 1px dashed hsl(var(--border));
    margin-bottom: 0.5rem;
}

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

.toast {
    position: fixed;
    bottom: 1.5rem;
    right: 1.5rem;
    background-color: hsl(var(--primary));
    color: hsl(var(--primary-foreground));
    padding: 0.75rem 1.5rem;
    border-radius: var(--radius);
    font-size: 0.875rem;
    font-weight: 500;
    display: flex;
    align-items: center;
    gap: 0.5rem;
    box-shadow: 0 4px 12px rgba(0, 0, 0, 0.1);
    animation: slideUp 0.3s ease-out;
    z-index: 50;
}

.hidden {
    display: none !important;
}

@keyframes slideDown {
    from { opacity: 0; transform: translateY(-10px); }
    to { opacity: 1; transform: translateY(0); }
}

@keyframes slideUp {
    from { opacity: 0; transform: translateY(10px); }
    to { opacity: 1; transform: translateY(0); }
}