:root {
    --bg-color: #0f172a;
    --surface-color: #1e293b;
    --surface-hover: #334155;
    --primary-color: #3b82f6;
    --primary-hover: #2563eb;
    --secondary-color: #10b981;
    --danger-color: #ef4444;
    --text-color: #f8fafc;
    --text-muted: #94a3b8;
    --border-color: #334155;
    --shadow: 0 4px 6px -1px rgb(0 0 0 / 0.1), 0 2px 4px -2px rgb(0 0 0 / 0.1);
    --border-radius: 8px;
}

* {
    box-sizing: border-box;
    margin: 0;
    padding: 0;
    font-family: 'Inter', -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Helvetica, Arial, sans-serif;
}

body {
    background-color: var(--bg-color);
    color: var(--text-color);
    line-height: 1.5;
    min-height: 100vh;
    display: flex;
    flex-direction: column;
}

/* Typography */
h1, h2, h3 { margin-bottom: 1rem; color: #fff; font-weight: 600; }
h1 { font-size: 2rem; }
h2 { font-size: 1.5rem; }

/* Header & Nav */
.app-header {
    background-color: var(--surface-color);
    padding: 1rem 2rem;
    display: flex;
    justify-content: space-between;
    align-items: center;
    border-bottom: 1px solid var(--border-color);
    box-shadow: var(--shadow);
}
.logo { font-size: 1.25rem; font-weight: bold; color: var(--primary-color); display: flex; align-items: center; gap: 0.5rem; }
.main-nav { display: flex; gap: 1rem; }
.nav-btn {
    background: transparent; border: none; color: var(--text-muted); cursor: pointer; padding: 0.5rem 1rem; font-size: 1rem; border-radius: var(--border-radius); transition: all 0.2s;
}
.nav-btn:hover { background-color: var(--surface-hover); color: var(--text-color); }
.nav-btn.active { background-color: var(--primary-color); color: white; }

/* Main Container */
#app-container { flex: 1; padding: 2rem; max-width: 1200px; margin: 0 auto; width: 100%; }
.view-section { animation: fadeIn 0.3s ease-in-out; }
@keyframes fadeIn { from { opacity: 0; transform: translateY(10px); } to { opacity: 1; transform: translateY(0); } }

/* Cards & Surface */
.card { background-color: var(--surface-color); border: 1px solid var(--border-color); border-radius: var(--border-radius); padding: 1.5rem; margin-bottom: 1.5rem; box-shadow: var(--shadow); }

/* Buttons */
.btn { display: inline-flex; align-items: center; justify-content: center; padding: 0.5rem 1rem; font-size: 1rem; font-weight: 500; border-radius: var(--border-radius); cursor: pointer; transition: all 0.2s; border: none; gap: 0.5rem; }
.btn-small { padding: 0.25rem 0.5rem; font-size: 0.875rem; }
.primary { background-color: var(--primary-color); color: white; }
.primary:hover { background-color: var(--primary-hover); }
.success { background-color: var(--secondary-color); color: white; }
.success:hover { background-color: #059669; }
.danger { background-color: var(--danger-color); color: white; }
.danger:hover { background-color: #dc2626; }
.secondary { background-color: var(--surface-hover); color: var(--text-color); border: 1px solid var(--border-color); }
.secondary:hover { background-color: #475569; }

/* Forms & Inputs */
.form-group { margin-bottom: 1rem; }
.form-group label { display: block; margin-bottom: 0.5rem; color: var(--text-muted); font-size: 0.875rem; }
.form-control { width: 100%; padding: 0.75rem; background-color: #0f172a; border: 1px solid var(--border-color); color: var(--text-color); border-radius: var(--border-radius); outline: none; transition: border-color 0.2s; }
.form-control:focus { border-color: var(--primary-color); }
select.form-control { appearance: none; background-image: url("data:image/svg+xml;charset=UTF-8,%3csvg xmlns='http://www.w3.org/2000/svg' viewBox='0 0 24 24' fill='none' stroke='%2394a3b8' stroke-width='2' stroke-linecap='round' stroke-linejoin='round'%3e%3cpolyline points='6 9 12 15 18 9'%3e%3c/polyline%3e%3c/svg%3e"); background-repeat: no-repeat; background-position: right 1rem center; background-size: 1em; }

/* Tables */
.table-responsive { overflow-x: auto; border-radius: var(--border-radius); border: 1px solid var(--border-color); }
table { width: 100%; border-collapse: collapse; text-align: left; }
th, td { padding: 1rem; border-bottom: 1px solid var(--border-color); }
th { background-color: var(--surface-color); color: var(--text-muted); font-weight: 500; text-transform: uppercase; font-size: 0.75rem; letter-spacing: 0.05em; }
tbody tr { transition: background-color 0.2s; }
tbody tr:hover { background-color: var(--surface-hover); }

/* Utilities */
.hidden { display: none !important; }
.flex { display: flex; } .justify-between { justify-content: space-between; } .align-center { align-items: center; } .gap-4 { gap: 1rem; } .gap-2 { gap: 0.5rem; }
.mt-4 { margin-top: 1rem; } .mb-4 { margin-bottom: 1rem; } .text-center { text-align: center; }

/* Badge */
.badge { display: inline-block; padding: 0.25em 0.5em; font-size: 0.75em; font-weight: 600; border-radius: 999px; }
.badge.active { background-color: rgba(16, 185, 129, 0.2); color: var(--secondary-color); }
.badge.finished { background-color: rgba(148, 163, 184, 0.2); color: var(--text-muted); }

/* Modal */
.modal { position: fixed; top: 0; left: 0; width: 100%; height: 100%; background: rgba(0, 0, 0, 0.7); display: flex; justify-content: center; align-items: center; z-index: 1000; backdrop-filter: blur(2px); }
.modal-content { background: var(--surface-color); padding: 2rem; border-radius: var(--border-radius); border: 1px solid var(--border-color); max-width: 500px; width: 90%; box-shadow: 0 20px 25px -5px rgb(0 0 0 / 0.1); }
.modal-content p { color: var(--text-muted); margin-bottom: 1.5rem; }
.modal-actions { display: flex; justify-content: flex-end; gap: 1rem; }

/* Dashboard Grids */
.grid-2 { display: grid; grid-template-columns: repeat(2, 1fr); gap: 1.5rem; }
.grid-3 { display: grid; grid-template-columns: repeat(3, 1fr); gap: 1.5rem; }
@media (max-width: 768px) { .grid-2, .grid-3 { grid-template-columns: 1fr; } }

@media print {
    body {
        display: block !important;
        min-height: auto !important;
        height: auto !important;
        background: white !important;
        color: black !important;
    }
    #app-container {
        display: block !important;
        padding: 0 !important;
        margin: 0 !important;
        max-width: none !important;
    }
    .app-header {
        display: none !important;
    }
}