/* Party Expense Management System - Stylesheet */

* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

:root {
    --primary-color: #4a90e2;
    --secondary-color: #6c757d;
    --success-color: #28a745;
    --danger-color: #dc3545;
    --warning-color: #ffc107;
    --bg-color: #f8f9fa;
    --card-bg: #ffffff;
    --text-color: #333333;
    --border-color: #dee2e6;
    --shadow: 0 2px 4px rgba(0,0,0,0.1);
    --shadow-lg: 0 4px 6px rgba(0,0,0,0.1);
}

body {
    font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, 'Helvetica Neue', Arial, sans-serif;
    background-color: var(--bg-color);
    color: var(--text-color);
    line-height: 1.6;
    padding: 20px;
}

.container {
    max-width: 1200px;
    margin: 0 auto;
}

/* Header */
header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 30px;
    padding: 20px;
    background: var(--card-bg);
    border-radius: 8px;
    box-shadow: var(--shadow);
}

header h1 {
    font-size: 2rem;
    color: var(--primary-color);
}

.header-actions {
    display: flex;
    gap: 10px;
}

/* Buttons */
.btn {
    display: inline-block;
    padding: 10px 20px;
    border: none;
    border-radius: 5px;
    cursor: pointer;
    text-decoration: none;
    font-size: 1rem;
    transition: all 0.3s;
    text-align: center;
}

.btn-primary {
    background-color: var(--primary-color);
    color: white;
}

.btn-primary:hover {
    background-color: #357abd;
}

.btn-secondary {
    background-color: var(--secondary-color);
    color: white;
}

.btn-secondary:hover {
    background-color: #5a6268;
}

.btn-small {
    padding: 6px 12px;
    font-size: 0.875rem;
}

/* Filters */
.filters {
    background: var(--card-bg);
    padding: 20px;
    border-radius: 8px;
    box-shadow: var(--shadow);
    margin-bottom: 30px;
}

.filters h2 {
    margin-bottom: 15px;
    font-size: 1.5rem;
}

.filter-buttons {
    display: flex;
    gap: 10px;
    flex-wrap: wrap;
    margin-bottom: 15px;
}

.filter-btn {
    padding: 8px 16px;
    border: 2px solid var(--border-color);
    background: white;
    border-radius: 5px;
    cursor: pointer;
    transition: all 0.3s;
}

.filter-btn:hover {
    border-color: var(--primary-color);
}

.filter-btn.active {
    background-color: var(--primary-color);
    color: white;
    border-color: var(--primary-color);
}

.custom-date-range {
    display: flex;
    gap: 15px;
    align-items: center;
    flex-wrap: wrap;
    padding-top: 15px;
    border-top: 1px solid var(--border-color);
}

.custom-date-range label {
    display: flex;
    flex-direction: column;
    gap: 5px;
}

.custom-date-range input[type="date"] {
    padding: 8px;
    border: 1px solid var(--border-color);
    border-radius: 5px;
    font-size: 1rem;
}

.filter-report-cta {
    margin-top: 15px;
    padding-top: 15px;
    border-top: 1px solid var(--border-color);
}

.filter-report-cta .btn {
    text-decoration: none;
    display: inline-block;
}

/* Statistics */
.statistics {
    background: var(--card-bg);
    padding: 20px;
    border-radius: 8px;
    box-shadow: var(--shadow);
    margin-bottom: 30px;
}

.statistics h2 {
    margin-bottom: 20px;
    font-size: 1.5rem;
}

.stats-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
    gap: 20px;
}

.stat-card {
    background: var(--bg-color);
    padding: 20px;
    border-radius: 8px;
    text-align: center;
    border: 2px solid var(--border-color);
}

.stat-label {
    font-size: 0.9rem;
    color: var(--secondary-color);
    margin-bottom: 10px;
}

.stat-value {
    font-size: 1.8rem;
    font-weight: bold;
    color: var(--primary-color);
}

/* Parties List */
.parties-list {
    background: var(--card-bg);
    padding: 20px;
    border-radius: 8px;
    box-shadow: var(--shadow);
}

.parties-list h2 {
    margin-bottom: 20px;
    font-size: 1.5rem;
}

.parties-container {
    display: flex;
    flex-direction: column;
    gap: 15px;
}

.party-card {
    background: var(--bg-color);
    padding: 20px;
    border-radius: 8px;
    border: 1px solid var(--border-color);
    transition: all 0.3s;
}

.party-card:hover {
    box-shadow: var(--shadow-lg);
    transform: translateY(-2px);
}

.party-card-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 15px;
}

.party-card-header h3 {
    font-size: 1.3rem;
    color: var(--primary-color);
}

.party-date {
    color: var(--secondary-color);
    font-size: 0.9rem;
}

.party-card-body {
    display: flex;
    justify-content: space-between;
    align-items: center;
    flex-wrap: wrap;
    gap: 15px;
}

.party-info {
    display: flex;
    gap: 20px;
    flex-wrap: wrap;
}

.party-info span {
    color: var(--secondary-color);
}

.party-actions {
    display: flex;
    gap: 10px;
}

/* Pagination */
.pagination {
    margin-top: 20px;
    padding-top: 20px;
    border-top: 1px solid var(--border-color);
}

.pagination-controls {
    display: flex;
    justify-content: center;
    align-items: center;
    gap: 15px;
}

.pagination-btn {
    padding: 8px 16px;
    border: 1px solid var(--border-color);
    background: white;
    border-radius: 5px;
    cursor: pointer;
    transition: all 0.3s;
}

.pagination-btn:hover {
    background-color: var(--primary-color);
    color: white;
    border-color: var(--primary-color);
}

.pagination-info {
    color: var(--secondary-color);
}

/* Party Form */
.party-form {
    background: var(--card-bg);
    padding: 30px;
    border-radius: 8px;
    box-shadow: var(--shadow);
    margin-bottom: 30px;
}

.form-group {
    margin-bottom: 25px;
}

.form-group label {
    display: block;
    margin-bottom: 8px;
    font-weight: 600;
    color: var(--text-color);
}

.form-group input[type="text"],
.form-group input[type="date"],
.form-group input[type="number"],
.form-group select {
    width: 100%;
    padding: 10px;
    border: 1px solid var(--border-color);
    border-radius: 5px;
    font-size: 1rem;
    transition: border-color 0.3s;
}

.form-group input:focus,
.form-group select:focus {
    outline: none;
    border-color: var(--primary-color);
}

.attendees-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(200px, 1fr));
    gap: 10px;
}

.attendee-checkbox {
    display: flex;
    align-items: center;
    gap: 8px;
    padding: 10px;
    background: var(--bg-color);
    border-radius: 5px;
    cursor: pointer;
    transition: all 0.3s;
}

.attendee-checkbox:hover {
    background-color: #e9ecef;
}

.attendee-checkbox input[type="checkbox"] {
    width: 18px;
    height: 18px;
    cursor: pointer;
}

/* Items */
#itemsContainer {
    display: flex;
    flex-direction: column;
    gap: 15px;
    margin-bottom: 15px;
}

.item-row {
    display: grid;
    grid-template-columns: 2fr 1fr 1.5fr 1fr auto;
    gap: 10px;
    align-items: center;
    padding: 15px;
    background: var(--bg-color);
    border-radius: 5px;
    border: 1px solid var(--border-color);
}

.item-divide-among {
    grid-column: 1 / -1;
    margin-top: 8px;
    padding-top: 10px;
    border-top: 1px dashed var(--border-color);
}

.divide-among-label {
    display: block;
    font-size: 0.85rem;
    color: var(--secondary-color);
    margin-bottom: 6px;
}

.item-divide-among-checkboxes {
    display: flex;
    flex-wrap: wrap;
    gap: 10px 16px;
}

.item-divide-among-checkboxes .attendee-checkbox {
    margin: 0;
}

.divide-among-hint {
    font-size: 0.85rem;
    color: var(--secondary-color);
    font-style: italic;
}

.item-field {
    display: flex;
    align-items: center;
}

.item-field input,
.item-field select {
    width: 100%;
    padding: 8px;
    border: 1px solid var(--border-color);
    border-radius: 5px;
    font-size: 0.9rem;
}

.checkbox-label {
    display: flex;
    align-items: center;
    gap: 5px;
    cursor: pointer;
}

.checkbox-label input[type="checkbox"] {
    width: 18px;
    height: 18px;
    cursor: pointer;
}

.btn-remove {
    background-color: var(--danger-color);
    color: white;
    border: none;
    border-radius: 50%;
    width: 30px;
    height: 30px;
    cursor: pointer;
    font-size: 1.2rem;
    display: flex;
    align-items: center;
    justify-content: center;
    transition: all 0.3s;
}

.btn-remove:hover {
    background-color: #c82333;
}

.form-actions {
    display: flex;
    gap: 10px;
    margin-top: 30px;
}

/* Calculations */
.calculations {
    background: var(--card-bg);
    padding: 20px;
    border-radius: 8px;
    box-shadow: var(--shadow);
    margin-top: 20px;
}

.calculations h3 {
    margin-bottom: 15px;
    color: var(--primary-color);
}

.calc-section {
    margin-bottom: 20px;
}

.calc-section h4 {
    margin-bottom: 10px;
    color: var(--text-color);
}

.calc-row {
    display: flex;
    justify-content: space-between;
    padding: 10px;
    margin-bottom: 8px;
    background: var(--bg-color);
    border-radius: 5px;
}

.calc-row.owes {
    background-color: #fff3cd;
    border-left: 4px solid var(--warning-color);
}

.calc-row.paid-more {
    background-color: #d4edda;
    border-left: 4px solid var(--success-color);
}

/* Party Details */
.party-details {
    background: var(--card-bg);
    padding: 30px;
    border-radius: 8px;
    box-shadow: var(--shadow);
}

.party-header {
    margin-bottom: 30px;
    padding-bottom: 20px;
    border-bottom: 2px solid var(--border-color);
}

.party-header h2 {
    font-size: 2rem;
    color: var(--primary-color);
    margin-bottom: 10px;
}

.party-meta {
    display: flex;
    gap: 20px;
    color: var(--secondary-color);
}

.party-summary {
    margin-bottom: 30px;
}

.summary-card {
    background: var(--bg-color);
    padding: 20px;
    border-radius: 8px;
    text-align: center;
    border: 2px solid var(--primary-color);
}

.summary-label {
    font-size: 0.9rem;
    color: var(--secondary-color);
    margin-bottom: 10px;
}

.summary-value {
    font-size: 2rem;
    font-weight: bold;
    color: var(--primary-color);
}

.party-section {
    margin-bottom: 30px;
}

.party-section h3 {
    font-size: 1.5rem;
    margin-bottom: 15px;
    color: var(--primary-color);
}

.attendees-list {
    display: flex;
    flex-wrap: wrap;
    gap: 10px;
}

.attendee-badge {
    background: var(--primary-color);
    color: white;
    padding: 8px 16px;
    border-radius: 20px;
    font-size: 0.9rem;
}

/* Tables */
.items-table,
.amounts-table {
    width: 100%;
    border-collapse: collapse;
    background: var(--card-bg);
    border-radius: 8px;
    overflow: hidden;
}

.items-table th,
.amounts-table th {
    background: var(--primary-color);
    color: white;
    padding: 12px;
    text-align: left;
    font-weight: 600;
}

.items-table td,
.amounts-table td {
    padding: 12px;
    border-bottom: 1px solid var(--border-color);
}

.items-table tr:hover,
.amounts-table tr:hover {
    background-color: var(--bg-color);
}

.amounts-table tr.owes {
    background-color: #fff3cd;
}

.amounts-table tr.paid-more {
    background-color: #d4edda;
}

.net-amount {
    font-weight: bold;
}

.pending-amount {
    font-weight: bold;
}

.pending-amount.settled {
    color: var(--success-color);
}

.summary-card.settled {
    border-color: var(--success-color);
    background-color: #d4edda;
}

.summary-card.pending {
    border-color: var(--warning-color);
    background-color: #fff3cd;
}

.badge {
    display: inline-block;
    padding: 4px 8px;
    border-radius: 12px;
    font-size: 0.8rem;
    font-weight: 600;
    margin-left: 10px;
}

.badge.settled {
    background-color: var(--success-color);
    color: white;
}

.badge.pending {
    background-color: var(--warning-color);
    color: #856404;
}

/* Per-Person Analytics */
.per-person-analytics {
    background: var(--card-bg);
    padding: 20px;
    border-radius: 8px;
    box-shadow: var(--shadow);
    margin-bottom: 30px;
}

.per-person-analytics h2 {
    margin-bottom: 20px;
    font-size: 1.5rem;
}

.analytics-table {
    width: 100%;
    border-collapse: collapse;
    background: var(--card-bg);
    border-radius: 8px;
    overflow: hidden;
}

.analytics-table th {
    background: var(--primary-color);
    color: white;
    padding: 12px;
    text-align: left;
    font-weight: 600;
}

.analytics-table td {
    padding: 12px;
    border-bottom: 1px solid var(--border-color);
}

.analytics-table tr:hover {
    background-color: var(--bg-color);
}

.analytics-table tr.paid-more {
    background-color: #d4edda;
}

.analytics-table tr.paid-less {
    background-color: #fff3cd;
}

.analytics-table .difference {
    font-weight: bold;
}

.analytics-table .difference.paid-more {
    color: var(--success-color);
}

.analytics-table .difference.paid-less {
    color: var(--warning-color);
}

/* Friends Summary */
.friends-summary {
    background: var(--card-bg);
    padding: 20px;
    border-radius: 8px;
    box-shadow: var(--shadow);
    margin-bottom: 30px;
}

.friends-summary h2 {
    margin-bottom: 20px;
    font-size: 1.5rem;
}

.friends-summary-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(280px, 1fr));
    gap: 20px;
}

.friend-summary-card {
    background: var(--bg-color);
    padding: 20px;
    border-radius: 8px;
    border: 2px solid var(--border-color);
    transition: all 0.3s;
}

.friend-summary-card:hover {
    box-shadow: var(--shadow-lg);
    transform: translateY(-2px);
}

.friend-summary-card.owes {
    border-color: var(--warning-color);
    background-color: #fff3cd;
}

.friend-summary-card.should-get {
    border-color: var(--success-color);
    background-color: #d4edda;
}

.friend-summary-card.settled {
    border-color: var(--secondary-color);
}

.friend-name {
    font-size: 1.2rem;
    font-weight: bold;
    color: var(--primary-color);
    margin-bottom: 15px;
    padding-bottom: 10px;
    border-bottom: 1px solid var(--border-color);
}

.friend-stats {
    display: flex;
    flex-direction: column;
    gap: 10px;
}

.friend-stat {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 8px 0;
}

.friend-stat .stat-label {
    font-weight: 600;
    color: var(--secondary-color);
}

.friend-stat .stat-value {
    font-weight: bold;
    color: var(--text-color);
}

.friend-stat.net-stat {
    margin-top: 10px;
    padding-top: 10px;
    border-top: 2px solid var(--border-color);
}

.friend-stat.net-stat.owes .stat-value {
    color: var(--warning-color);
}

.friend-stat.net-stat.should-get .stat-value {
    color: var(--success-color);
}

.friend-stat.net-stat.settled .stat-value {
    color: var(--secondary-color);
}

/* Settlements */
.settlements-list {
    margin-bottom: 20px;
}

.settlements-table {
    width: 100%;
    border-collapse: collapse;
    background: var(--card-bg);
    border-radius: 8px;
    overflow: hidden;
    margin-bottom: 20px;
}

.settlements-table th {
    background: var(--primary-color);
    color: white;
    padding: 12px;
    text-align: left;
    font-weight: 600;
}

.settlements-table td {
    padding: 12px;
    border-bottom: 1px solid var(--border-color);
}

.settlements-table tr:hover {
    background-color: var(--bg-color);
}

.btn-remove-small {
    background-color: var(--danger-color);
    color: white;
    border: none;
    border-radius: 50%;
    width: 24px;
    height: 24px;
    cursor: pointer;
    font-size: 1rem;
    display: flex;
    align-items: center;
    justify-content: center;
    transition: all 0.3s;
    padding: 0;
}

.btn-remove-small:hover {
    background-color: #c82333;
}

.settle-full-party-cta {
    margin-bottom: 20px;
    padding: 16px;
    background: rgba(74, 144, 226, 0.08);
    border: 1px solid var(--primary-color);
    border-radius: 8px;
}

.settle-full-party-cta .btn {
    margin-bottom: 8px;
}

.settle-full-hint {
    font-size: 0.9rem;
    color: var(--secondary-color);
    margin: 8px 0 0;
}

.add-settlement {
    background: var(--bg-color);
    padding: 20px;
    border-radius: 8px;
    border: 1px solid var(--border-color);
    margin-top: 20px;
}

.add-settlement h4 {
    margin-bottom: 15px;
    color: var(--primary-color);
}

.settlement-form {
    margin-top: 15px;
}

.form-row {
    display: grid;
    grid-template-columns: 2fr 2fr 1fr auto;
    gap: 15px;
    align-items: end;
}

.form-row .form-group {
    margin-bottom: 0;
}

.form-row .form-group label {
    display: block;
    margin-bottom: 5px;
    font-weight: 600;
    font-size: 0.9rem;
}

.form-row .form-group select,
.form-row .form-group input {
    width: 100%;
    padding: 8px;
    border: 1px solid var(--border-color);
    border-radius: 5px;
    font-size: 0.9rem;
}

/* Loading & Error States */
.loading,
.error,
.empty-state {
    text-align: center;
    padding: 40px;
    color: var(--secondary-color);
    font-size: 1.1rem;
}

.error {
    color: var(--danger-color);
}

/* Responsive Design */
@media (max-width: 768px) {
    body {
        padding: 10px;
    }

    header {
        flex-direction: column;
        gap: 15px;
        align-items: flex-start;
    }

    .stats-grid {
        grid-template-columns: 1fr;
    }

    .item-row {
        grid-template-columns: 1fr;
        gap: 10px;
    }

    .party-card-body {
        flex-direction: column;
        align-items: flex-start;
    }

    .custom-date-range {
        flex-direction: column;
        align-items: stretch;
    }

    .custom-date-range label {
        width: 100%;
    }

    .form-row {
        grid-template-columns: 1fr;
    }

    .settlements-table {
        font-size: 0.85rem;
    }

    .settlements-table th,
    .settlements-table td {
        padding: 8px;
    }

    .friends-summary-grid {
        grid-template-columns: 1fr;
    }

    .analytics-table {
        font-size: 0.85rem;
        display: block;
        overflow-x: auto;
    }

    .analytics-table th,
    .analytics-table td {
        padding: 8px;
    }
}