:root {
    --primary: #2563eb;
    --primary-dark: #1d4ed8;
    --bg: #f8fafc;
    --card-bg: #ffffff;
    --text: #1e293b;
    --muted: #64748b;
    --border: #e2e8f0;
    --success: #16a34a;
    --radius: 12px;
}

* {
    box-sizing: border-box;
}

body {
    font-family: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
    background: var(--bg);
    color: var(--text);
    margin: 0;
    line-height: 1.6;
}

.app-wrapper {
    min-height: 100vh;
    display: flex;
    flex-direction: column;
}

.app-header {
    background: linear-gradient(135deg, var(--primary) 0%, var(--primary-dark) 100%);
    color: white;
    padding: 2rem 0;
    text-align: center;
}

.app-logo {
    font-size: 2rem;
    font-weight: 700;
    margin: 0;
}

.app-tagline {
    margin: 0.5rem 0 0;
    opacity: 0.9;
}

.wizard-steps {
    display: flex;
    justify-content: center;
    gap: 0.5rem;
    padding: 1.5rem 1rem;
    flex-wrap: wrap;
}

.wizard-steps .step {
    padding: 0.5rem 1rem;
    background: var(--card-bg);
    border: 1px solid var(--border);
    border-radius: 999px;
    font-size: 0.875rem;
    color: var(--muted);
    transition: all 0.2s;
}

.wizard-steps .step span {
    font-weight: 700;
    margin-right: 0.25rem;
}

.wizard-steps .step.active {
    background: var(--primary);
    color: white;
    border-color: var(--primary);
}

.wizard-steps .step.completed {
    background: #dcfce7;
    color: var(--success);
    border-color: #bbf7d0;
}

.app-main {
    flex: 1;
    padding-bottom: 3rem;
}

.card {
    border: 1px solid var(--border);
    border-radius: var(--radius);
    box-shadow: 0 1px 3px rgba(0, 0, 0, 0.05);
}

.upload-zone {
    border: 2px dashed var(--border);
    border-radius: var(--radius);
    padding: 3rem 2rem;
    transition: border-color 0.2s, background 0.2s;
    cursor: pointer;
}

.upload-zone.dragover {
    border-color: var(--primary);
    background: #eff6ff;
}

.upload-icon {
    font-size: 3rem;
    margin-bottom: 1rem;
}

.conversion-card {
    border: 2px solid var(--border);
    border-radius: var(--radius);
    padding: 1.5rem;
    cursor: pointer;
    transition: all 0.2s;
    height: 100%;
}

.conversion-card:hover {
    border-color: var(--primary);
}

.conversion-card.active {
    border-color: var(--primary);
    background: #eff6ff;
}

.conversion-card h3 {
    font-size: 1.125rem;
    margin-bottom: 0.5rem;
}

.conversion-card ul {
    padding-left: 1.25rem;
    margin: 1rem 0 0;
    font-size: 0.875rem;
    color: var(--muted);
}

.analysis-log li {
    padding: 0.25rem 0;
    color: var(--muted);
}

.stat-box {
    background: var(--bg);
    border-radius: var(--radius);
    padding: 1rem;
    text-align: center;
}

.stat-box .number {
    font-size: 1.75rem;
    font-weight: 700;
    color: var(--primary);
}

.stat-box .label {
    font-size: 0.875rem;
    color: var(--muted);
}

.processing-steps li {
    padding: 0.5rem 0;
    font-size: 1.05rem;
}

.processing-steps li.done {
    color: var(--success);
}

.processing-steps li.active {
    color: var(--primary);
    font-weight: 600;
}

.result-icon {
    font-size: 4rem;
}

.result-details {
    display: inline-block;
    text-align: left;
    background: var(--bg);
    padding: 1.5rem 2rem;
    border-radius: var(--radius);
}

.advanced-options summary {
    cursor: pointer;
    color: var(--primary);
    font-weight: 500;
}

.app-footer {
    padding: 1.5rem 0;
    border-top: 1px solid var(--border);
    margin-top: auto;
}

@media (max-width: 768px) {
    .app-logo {
        font-size: 1.5rem;
    }

    .wizard-steps .step {
        font-size: 0.75rem;
        padding: 0.375rem 0.75rem;
    }

    .upload-zone {
        padding: 2rem 1rem;
    }
}

@media (max-width: 576px) {
    .wizard-steps {
        gap: 0.25rem;
    }

    .wizard-steps .step span {
        display: none;
    }
}