@layer base, components, utilities;

@layer base {
    :root {
        /* Color Palette - OKLCH */
        --primary: oklch(70% 0.15 30);
        --primary-hover: oklch(65% 0.18 30);
        --secondary: oklch(90% 0.05 30);
        --background: oklch(99% 0.01 30);
        --surface: oklch(100% 0 0);
        --text: oklch(25% 0.02 30);
        --text-muted: oklch(50% 0.01 30);
        --border: oklch(92% 0.01 30);
        --error: oklch(60% 0.15 20);
        --success: oklch(70% 0.15 140);
        
        /* Spacing & Radii */
        --radius-sm: 8px;
        --radius-md: 16px;
        --radius-lg: 24px;
        --shadow-sm: 0 2px 4px 0 oklch(0% 0 0 / 0.05);
        --shadow-md: 0 10px 15px -3px oklch(0% 0 0 / 0.08), 0 4px 6px -4px oklch(0% 0 0 / 0.05);
        --shadow-lg: 0 20px 25px -5px oklch(0% 0 0 / 0.1), 0 8px 10px -6px oklch(0% 0 0 / 0.05);
        --glow: 0 0 20px oklch(70% 0.15 30 / 0.3);
    }

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

    body {
        font-family: 'Inter', system-ui, -apple-system, sans-serif;
        background-color: var(--background);
        color: var(--text);
        line-height: 1.6;
        -webkit-font-smoothing: antialiased;
        min-height: 100dvh;
        display: flex;
        flex-direction: column;
    }

    #app {
        max-width: 480px; /* Mobile focused */
        width: 100%;
        margin: 0 auto;
        padding: 24px;
        flex: 1;
    }

    h1 {
        font-size: 2.25rem;
        font-weight: 800;
        line-height: 1.1;
        letter-spacing: -0.02em;
        margin-bottom: 1.5rem;
        background: linear-gradient(to bottom right, var(--text), var(--primary));
        -webkit-background-clip: text;
        -webkit-text-fill-color: transparent;
    }

    h2 {
        font-size: 1.5rem;
        font-weight: 700;
        margin-bottom: 1rem;
    }

    p {
        margin-bottom: 1rem;
        color: var(--text-muted);
    }

    a {
        color: var(--primary);
        text-decoration: none;
        font-weight: 500;
    }
}

@layer components {
    .container {
        display: flex;
        flex-direction: column;
        gap: 24px;
    }

    .card {
        background: var(--surface);
        border-radius: var(--radius-md);
        padding: 24px;
        box-shadow: var(--shadow-md);
        border: 1px solid var(--border);
        transition: transform 0.2s ease, box-shadow 0.2s ease;
        container-type: inline-size;
    }

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

    button {
        background-color: var(--primary);
        color: white;
        border: none;
        padding: 16px 24px;
        border-radius: var(--radius-md);
        font-size: 1rem;
        font-weight: 700;
        cursor: pointer;
        transition: all 0.2s cubic-bezier(0.4, 0, 0.2, 1);
        width: 100%;
        box-shadow: var(--shadow-sm);
    }

    button:hover {
        background-color: var(--primary-hover);
        box-shadow: var(--glow);
        transform: scale(1.02);
    }

    button:active {
        transform: scale(0.98);
    }

    button:disabled {
        background-color: var(--secondary);
        cursor: not-allowed;
        transform: none;
        box-shadow: none;
    }

    .form-group {
        display: flex;
        flex-direction: column;
        gap: 8px;
    }

    .form-group label {
        font-size: 0.875rem;
        font-weight: 600;
        color: var(--text);
    }

    .form-group input,
    .form-group select {
        padding: 12px 16px;
        border: 2px solid var(--border);
        border-radius: var(--radius-sm);
        font-size: 1rem;
        transition: border-color 0.2s ease;
        background: var(--surface);
    }

    .form-group input:focus,
    .form-group select:focus {
        outline: none;
        border-color: var(--primary);
    }

    /* Progress Indicator */
    .step-indicator {
        display: flex;
        justify-content: space-between;
        align-items: center;
        margin-bottom: 2rem;
        position: relative;
    }

    .step {
        width: 32px;
        height: 32px;
        border-radius: 50%;
        background: var(--secondary);
        color: var(--text-muted);
        display: flex;
        align-items: center;
        justify-content: center;
        font-weight: 700;
        font-size: 0.875rem;
        z-index: 1;
        transition: all 0.3s ease;
    }

    .step.active {
        background: var(--primary);
        color: white;
        box-shadow: var(--glow);
    }

    /* Badges */
    .badge-container {
        display: flex;
        flex-wrap: wrap;
        gap: 8px;
        margin: 12px 0;
    }

    .badge {
        padding: 4px 12px;
        background: var(--secondary);
        color: var(--text);
        border-radius: 20px;
        font-size: 0.75rem;
        font-weight: 700;
        text-transform: uppercase;
        letter-spacing: 0.05em;
    }

    /* Treatment/Hospital Cards */
    .treatment-card, .hospital-card {
        border-left: 4px solid var(--primary);
        margin-bottom: 16px;
    }

    .result-chart {
        width: 100% !important;
        height: auto !important;
        aspect-ratio: 1;
    }

    /* Spinner */
    .spinner {
        width: 48px;
        height: 48px;
        border: 4px solid var(--secondary);
        border-top-color: var(--primary);
        border-radius: 50%;
        animation: spin 1s linear infinite;
        margin: 2rem auto;
    }
}

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

@layer utilities {
    .text-center { text-align: center; }
    .mt-1 { margin-top: 4px; }
    .mt-2 { margin-top: 8px; }
    .mt-4 { margin-top: 16px; }
    
    /* Upload Zone */
    .upload-zone {
        border: 2px dashed var(--border);
        border-radius: var(--radius-md);
        padding: 40px 20px;
        text-align: center;
        cursor: pointer;
        transition: all 0.3s ease;
        background: var(--background);
        display: flex;
        flex-direction: column;
        align-items: center;
        gap: 12px;
        position: relative;
    }

    .upload-zone.dragging {
        border-color: var(--primary);
        background: oklch(70% 0.15 30 / 0.05);
        box-shadow: var(--glow);
    }

    .upload-zone i {
        font-size: 2.5rem;
        color: var(--primary);
    }

    .upload-zone p {
        margin: 0;
        font-size: 0.875rem;
        font-weight: 500;
    }

    .upload-zone .support-text {
        font-size: 0.75rem;
        color: var(--text-muted);
    }

    .preview-container {
        margin-top: 16px;
        display: none;
    }

    .preview-image {
        width: 100%;
        max-height: 200px;
        object-fit: cover;
        border-radius: var(--radius-sm);
        border: 1px solid var(--border);
    }

    .fade-in {
        animation: fadeIn 0.4s ease-out forwards;
    }
}

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

/* Container Query Example */
@container (min-width: 300px) {
    .treatment-card {
        display: grid;
        grid-template-columns: 1fr auto;
        gap: 16px;
    }
    .treatment-card .badge-container {
        grid-column: 1 / -1;
    }
}