/* Reset and base styles */
* {
    box-sizing: border-box;
    margin: 0;
    padding: 0;
    font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
}

body {
    line-height: 1.6;
    padding: 10px;
    min-height: 100vh;
}

/* Layout */
.container {
    max-width: 800px;
    margin: 0 auto;
    background-color: rgba(255, 255, 255, 0.95);
    border-radius: 6px;
    box-shadow: 0 8px 20px rgba(0, 0, 0, 0.15);
    overflow: hidden;
    padding: 10px;
}

header {
    text-align: center;
    margin-bottom: 20px;
    padding-bottom: 15px;
    border-bottom: 1px solid #e1e5e9;
}

h1 {
    color: #2c3e50;
    margin-bottom: 8px;
    font-size: 2.0rem;
}

.subtitle {
    color: #7f8c8d;
    font-size: 1.0rem;
}

/* Input section */
.input-section {
    margin-bottom: 20px;
}

/* Table styles */
table {
    width: 100%;
    border-collapse: collapse;
    border-spacing: 0;
}

thead th {
    background: #eef3ff;
    color: #2c3e50;
    font-weight: 700;
}

th,
td {
    border: 1px solid #e1e5e9;
    padding: 10px;
    text-align: center;
    min-width: 2em;
    white-space: nowrap;
}

tbody tr:hover {
    background: #f8fbff;
}

/* Summary cells */
.summary-cell {
    text-align: left;
}

.summary-value {
    font-size: 1.2rem;
    font-weight: bold;
}

#sumPercent {
    color: #dc3545;
    font-weight: bold;
}

/* Input cells */
.cell-input {
    width: 100%;
    padding: 4px 6px;
    border: 1px #e1e5e9;
    border-radius: 2px;
    font-size: 16px;
}

.cell-input:focus {
    border-color: #4a90e2;
    outline: none;
    box-shadow: 0 0 0 3px rgba(74, 144, 226, 0.2);
}

.cell-suffix {
    margin-left: 6px;
    color: #6c757d;
}

/* Buttons */
.buttons {
    display: flex;
    gap: 10px;
    margin-top: 15px;
    flex-wrap: wrap;
}

button {
    padding: 10px 20px;
    border: 1px solid #e1e5e9;
    border-radius: 4px;
    font-size: 14px;
    font-weight: 600;
    cursor: pointer;
    transition: all 0.3s ease;
    flex: 1;
    min-width: 140px;
}

.add-btn {
    background-color: #28a745;
    color: white;
}

.add-btn:hover {
    background-color: #218838;
    transform: translateY(-2px);
}

.calculate-btn {
    background-color: #007bff;
    color: white;
}

.calculate-btn:hover {
    background-color: #0069d9;
    transform: translateY(-2px);
}

.reset-btn {
    background-color: #dc3545;
    color: white;
}

.reset-btn:hover {
    background-color: #c82333;
    transform: translateY(-2px);
}

/* Results section */
.results {
    margin-top: 15px;
    padding: 15px;
    background-color: #f8f9fa;
    border-radius: 4px;
    border: 1px solid #e1e5e9;
}

.results h2 {
    color: #2c3e50;
    margin-bottom: 12px;
    font-size: 1.3rem;
}

.result-item {
    display: flex;
    justify-content: space-between;
    padding: 8px 0;
    border-bottom: 1px solid #e1e5e9;
}

.result-item:last-child {
    border-bottom: none;
}

.empty-state {
    text-align: center;
    padding: 30px;
    color: #6c757d;
}

/* History section */
.history {
    margin-top: 20px;
}

.history h3 {
    margin-bottom: 12px;
    color: #2c3e50;
    font-size: 1.3rem;
}

.history-list {
    list-style: none;
}

.history-item {
    display: block;
    padding: 12px;
    border: 1px solid #e1e5e9;
    border-radius: 4px;
    margin-bottom: 10px;
    background: #fff;
}

.history-summary {
    margin-bottom: 10px;
}

.summary-stats {
    color: #666;
    font-size: 0.9rem;
    margin-top: 4px;
}

.history-details {
    margin-top: 8px;
}

.history-detail-table {
    width: 100%;
    border-collapse: collapse;
    font-size: 0.8rem;
    background-color: #f8f9fa;
    border-radius: 4px;
    overflow: hidden;
    border: 1px solid #e1e5e9;
}

.history-detail-table th,
.history-detail-table td {
    border: 1px solid #e1e5e9;
    padding: 6px 8px;
    text-align: center;
    min-width: 2em;
    white-space: nowrap;
}

.history-detail-table th {
    background-color: #eef3ff;
    font-weight: 600;
    font-size: 0.75rem;
    color: #2c3e50;
}

.history-detail-table tbody tr:nth-child(even) {
    background-color: #f8fbff;
}

.history-detail-table tbody tr:nth-child(odd) {
    background-color: #ffffff;
}

.history-actions {
    display: flex;
    gap: 8px;
    justify-content: flex-end;
    margin-top: 10px;
    padding-top: 10px;
    border-top: 1px solid #e1e5e9;
}

.small-btn {
    padding: 6px 10px;
    font-size: 12px;
    min-width: auto;
    line-height: 1;
    border-radius: 4px;
    border: 1px solid #e1e5e9;
}

.history-header {
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: 10px;
    margin-bottom: 10px;
}

/* Footer */
footer {
    margin-top: 25px;
    text-align: center;
    color: #6c757d;
    font-size: 0.85rem;
}

/* Responsive design */
@media (max-width: 600px) {
    body {
        background: #ffffff;
    }

    .container {
        padding: 5px;
        border-radius: 4px;
    }

    header {
        padding-bottom: 12px;
        margin-bottom: 15px;
    }

    .subtitle {
        font-size: 0.95rem;
    }

    table {
        width: 100%;
    }

    th,
    td {
        padding: 8px;
        min-width: 2em;
        white-space: nowrap;
    }

    .cell-input {
        padding: 6px 8px;
        font-size: 16px;
    }

    .buttons {
        gap: 8px;
        margin-top: 12px;
    }

    .results {
        margin-top: 12px;
        padding: 12px;
    }

    .history {
        margin-top: 15px;
    }

    .history-item {
        padding: 10px;
        margin-bottom: 8px;
    }

    .history-detail-table {
        font-size: 0.75rem;
    }

    .history-detail-table th,
    .history-detail-table td {
        padding: 4px 6px;
        min-width: 2em;
        white-space: nowrap;
    }

    footer {
        margin-top: 20px;
    }
}