:root {
    --primary: #4f46e5;
    --primary-hover: #4338ca;
    --bg: #f8fafc;
    --card: #ffffff;
    --text: #0f172a;
    --text-muted: #64748b;
    --border: #cbd5e1;
    --danger: #ef4444;
    --warning-bg: #fffbeb;
    --warning-text: #b45309;
    --ring: rgba(79, 70, 229, 0.3);
}

body {
    font-family: 'Inter', sans-serif;
    background-color: var(--bg);
    color: var(--text);
    margin: 0;
    display: flex;
    justify-content: center;
    padding: 2rem 1rem;
    box-sizing: border-box;
}

.container {
    width: 100%;
    max-width: 640px;
    background: var(--card);
    padding: 2.5rem;
    border-radius: 16px;
    box-shadow: 0 10px 15px -3px rgb(0 0 0 / 0.1), 0 4px 6px -4px rgb(0 0 0 / 0.1);
}

header {
    text-align: center;
    margin-bottom: 2rem;
}

h1 { margin: 0; font-size: 1.75rem; color: var(--primary); font-weight: 600; }
header p { color: var(--text-muted); font-size: 0.95rem; margin-top: 0.5rem; }

/* Input Styling */
.input-group {
    display: flex;
    gap: 12px;
    margin-bottom: 1rem;
}

input[type="text"] {
    flex: 1;
    padding: 14px 16px;
    border: 2px solid var(--border);
    border-radius: 10px;
    font-size: 1rem;
    transition: all 0.2s ease;
}

input[type="text"]:focus {
    outline: none;
    border-color: var(--primary);
    box-shadow: 0 0 0 4px var(--ring);
}

button {
    cursor: pointer;
    padding: 12px 24px;
    border-radius: 10px;
    border: none;
    font-weight: 600;
    font-size: 0.95rem;
    font-family: inherit;
    transition: all 0.2s ease;
}

button:focus-visible {
    outline: none;
    box-shadow: 0 0 0 4px var(--ring);
}

#add-btn { background: var(--primary); color: white; }
#add-btn:hover { background: var(--primary-hover); transform: translateY(-1px); }

/* Chips */
.chips-container {
    display: flex;
    flex-wrap: wrap;
    gap: 10px;
    margin-bottom: 2rem;
    min-height: 36px;
}

.chip {
    background: #f1f5f9;
    border: 1px solid var(--border);
    padding: 6px 14px;
    border-radius: 20px;
    font-size: 0.9rem;
    font-weight: 500;
    cursor: pointer;
    display: flex;
    align-items: center;
    gap: 8px;
    animation: scaleIn 0.2s ease-out;
    transition: all 0.15s ease;
}

.chip:hover, .chip:focus {
    background: #fee2e2;
    border-color: var(--danger);
    color: var(--danger);
    outline: none;
}

/* Table Styling */
.table-container {
    min-height: 100px;
}

.empty-state {
    text-align: center;
    color: var(--text-muted);
    padding: 2rem;
    border: 2px dashed var(--border);
    border-radius: 12px;
    font-size: 0.95rem;
}

table {
    width: 100%;
    border-collapse: collapse;
    margin-bottom: 1.5rem;
}

th {
    text-align: left;
    border-bottom: 2px solid var(--border);
    padding: 12px 16px;
    color: var(--text-muted);
    font-size: 0.85rem;
    font-weight: 600;
    text-transform: uppercase;
    letter-spacing: 0.05em;
}

td {
    padding: 14px 16px;
    border-bottom: 1px solid var(--border);
    font-variant-numeric: tabular-nums;
}

.tr-total td {
    font-weight: 600;
    background: #f8fafc;
    border-bottom: none;
}

.tr-total td:first-child { border-radius: 0 0 0 8px; }
.tr-total td:last-child { border-radius: 0 0 8px 0; }

.tr-remainder td {
    background-color: var(--warning-bg);
    color: var(--warning-text);
    font-weight: 500;
}

/* Settings */
details {
    border-top: 1px solid var(--border);
    padding-top: 1.5rem;
    margin-top: 2.5rem;
}

summary {
    cursor: pointer;
    font-weight: 600;
    color: var(--text-muted);
    outline: none;
    user-select: none;
    border-radius: 6px;
}

summary:focus-visible { box-shadow: 0 0 0 3px var(--ring); }

.settings-content { padding-top: 1.25rem; }

.separator-toggle {
    margin-bottom: 1.5rem;
    padding: 12px 16px;
    background: #f1f5f9;
    border-radius: 10px;
    display: flex;
    flex-wrap: wrap;
    gap: 16px;
    align-items: center;
    font-size: 0.9rem;
}

.separator-toggle label {
    cursor: pointer;
    display: flex;
    align-items: center;
    gap: 6px;
    font-weight: 500;
}

.fractions-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(90px, 1fr));
    gap: 12px;
}

.check-item {
    display: flex;
    align-items: center;
    gap: 8px;
    font-size: 0.85rem;
    cursor: pointer;
    padding: 4px;
    border-radius: 4px;
}

.check-item:hover { background: #f1f5f9; }

/* Actions */
.actions {
    display: flex;
    justify-content: space-between;
    margin-top: 1.5rem;
}

.secondary-btn { background: #e2e8f0; color: var(--text); }
.secondary-btn:hover { background: #cbd5e1; }
.danger-btn { background: white; color: var(--danger); border: 2px solid var(--danger); }
.danger-btn:hover { background: var(--danger); color: white; }

/* Animations */
@keyframes scaleIn {
    from { opacity: 0; transform: scale(0.9); }
    to { opacity: 1; transform: scale(1); }
}

@media print {
    body { padding: 0; background: white; }
    .container { box-shadow: none; max-width: 100%; padding: 0; margin: 0; }
    .input-section, .settings-section, .actions { display: none !important; }
    h1 { color: black; text-align: left; }
    header p { text-align: left; }
    table { border: 2px solid #000; }
    th, td { border-bottom: 1px solid #000; color: #000; }
}