:root {
    --hf-orange: #f97316;
    --hf-yellow: #fbbf24;
    --text-dark: #0f172a;
    --text-muted: #475569;
    --bg-light: #f8f9fa;
    --card-bg: #ffffff;
    --border: #e2e8f0;
}

* {
    box-sizing: border-box;
}

body {
    font-family: 'Inter', system-ui, sans-serif;
    margin: 0;
    padding: 0;
    background-color: var(--bg-light);
    color: var(--text-dark);
    line-height: 1.6;
}

.navbar {
    background: white;
    border-bottom: 1px solid var(--border);
    padding: 1rem 2rem;
    display: flex;
    justify-content: space-between;
    align-items: center;
    box-shadow: 0 1px 3px rgba(0,0,0,0.05);
}

.logo {
    font-size: 1.6rem;
    font-weight: 700;
    color: var(--hf-orange);
}

.logo i {
    margin-right: 0.5rem;
}

.nav-links {
    display: flex;
    gap: 2rem;
}

.nav-links a {
    color: var(--text-muted);
    text-decoration: none;
    font-weight: 500;
    display: flex;
    align-items: center;
    gap: 0.5rem;
    transition: color 0.2s;
}

.nav-links a:hover {
    color: var(--hf-orange);
}

.container {
    max-width: 1280px;
    margin: 0 auto;
    padding: 2rem 1rem;
}

.section-title {
    font-size: 2.25rem;
    font-weight: 800;
    margin-bottom: 1.5rem;
    color: var(--text-dark);
}

.cards {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(340px, 1fr));
    gap: 1.75rem;
}

.card {
    background: var(--card-bg);
    border: 1px solid var(--border);
    border-radius: 0.75rem;
    padding: 1.5rem;
    box-shadow: 0 4px 6px -1px rgba(0,0,0,0.1), 0 2px 4px -1px rgba(0,0,0,0.06);
    transition: transform 0.2s, box-shadow 0.2s;
}

.card:hover {
    transform: translateY(-4px);
    box-shadow: 0 10px 15px -3px rgba(0,0,0,0.1), 0 4px 6px -2px rgba(0,0,0,0.05);
}

.card-title {
    font-size: 1.35rem;
    font-weight: 700;
    margin-bottom: 1rem;
    display: flex;
    align-items: center;
    gap: 0.75rem;
    color: var(--text-dark);
}

.card-title i {
    color: var(--hf-orange);
    font-size: 1.4rem;
}

.progress-container {
    margin: 1.25rem 0;
}

.progress-bar {
    background: #e2e8f0;
    border-radius: 9999px;
    height: 0.75rem;
    overflow: hidden;
}

.progress-fill {
    height: 100%;
    transition: width 0.4s ease;
}

.progress-text {
    font-size: 0.95rem;
    color: var(--text-muted);
    margin-top: 0.5rem;
    text-align: center;
    font-weight: 500;
}

.chart-container {
    height: 160px;
    margin: 1rem 0;
}

.button {
    padding: 0.65rem 1.25rem;
    border: none;
    border-radius: 0.5rem;
    font-weight: 600;
    cursor: pointer;
    display: inline-flex;
    align-items: center;
    gap: 0.5rem;
    transition: all 0.2s;
}

.button.primary {
    background: var(--hf-yellow);
    color: var(--text-dark);
}

.button.primary:hover {
    background: var(--hf-orange);
    color: white;
}

.button.secondary {
    background: var(--text-muted);
    color: white;
}

.button.secondary:hover {
    background: #334155;
}

.form-group {
    margin-bottom: 1.25rem;
}

.form-group label {
    display: block;
    margin-bottom: 0.5rem;
    font-weight: 500;
    color: var(--text-dark);
}

.form-group input,
.form-group select {
    width: 100%;
    padding: 0.75rem 1rem;
    border: 1px solid #cbd5e1;
    border-radius: 0.5rem;
    font-size: 1rem;
    background: #f8fafc;
}

#history-list {
    list-style: none;
    padding: 0;
}

#history-list li {
    background: white;
    border: 1px solid var(--border);
    border-radius: 0.5rem;
    padding: 1.25rem;
    margin-bottom: 1rem;
    box-shadow: 0 1px 3px rgba(0,0,0,0.1);
}

.modal {
    display: none;
    position: fixed;
    inset: 0;
    background: rgba(0,0,0,0.5);
    z-index: 1000;
    align-items: center;
    justify-content: center;
}

.modal-content {
    background: white;
    width: 90%;
    max-width: 480px;
    border-radius: 0.75rem;
    padding: 1.75rem;
    box-shadow: 0 20px 25px -5px rgba(0,0,0,0.1);
    position: relative;
}

.close {
    position: absolute;
    right: 1.25rem;
    top: 1rem;
    font-size: 2rem;
    color: #94a3b8;
    cursor: pointer;
}

.close:hover {
    color: #1e293b;
}

@media (max-width: 640px) {
    .navbar {
        flex-direction: column;
        gap: 1rem;
        padding: 1.25rem;
    }
    .nav-links {
        flex-wrap: wrap;
        justify-content: center;
    }
}