:root {
    --bg-body: #f5f7fb;
    --text-primary: #1d1f2c;
    --text-muted: #6c6f80;
}

* {
    box-sizing: border-box;
}

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

.app-header {
    background: #fff;
}

.app-name {
    font-weight: 600;
}

.app-footer {
    background: #fff;
    border-top: 1px solid rgba(0, 0, 0, 0.05);
}

.hero {
    background: linear-gradient(135deg, rgba(99, 102, 241, 0.1), rgba(16, 185, 129, 0.15));
    border-radius: 18px;
}

.hero-title {
    font-size: clamp(1.8rem, 3vw, 2.4rem);
    font-weight: 700;
}

.progress-card {
    background: #fff;
    border-radius: 16px;
    border: 1px solid rgba(0, 0, 0, 0.05);
}

.section-title {
    font-weight: 600;
}

.card {
    border-radius: 18px;
}

.list-group-item {
    border: none;
    padding-left: 0;
    padding-right: 0;
}

.btn-primary,
.btn-success {
    box-shadow: 0 10px 20px rgba(88, 80, 236, 0.15);
}

.btn-outline-secondary {
    border-color: rgba(0, 0, 0, 0.1);
}