/* Reset and base styles */
* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

body {
    font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
    line-height: 1.6;
    color: #333;
    background-color: #f4f4f4;
}

header {
    background-color: #2c3e50;
    color: white;
    padding: 1rem 0;
    box-shadow: 0 2px 5px rgba(0,0,0,0.1);
}

.header-content {
    align-items: center;
    display: flex;
    gap: 16px;
    justify-content: space-between;
    margin: 0 auto;
    max-width: 1200px;
    padding: 0 20px;
}

.header-logout {
    white-space: nowrap;
}

h1 {
    font-size: 2rem;
}

.container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 20px;
}

.loading-message {
    text-align: center;
    padding: 2rem;
    font-size: 1.2rem;
    color: #666;
}

.app-tabs {
    display: flex;
    gap: 10px;
    margin: 0 0 20px;
    border-bottom: 1px solid #d8dee4;
}

.tab-button {
    background: transparent;
    border: none;
    border-bottom: 3px solid transparent;
    color: #2c3e50;
    cursor: pointer;
    font-size: 1.05rem;
    font-weight: 600;
    padding: 12px 18px;
}

.tab-button.active {
    border-bottom-color: #3498db;
    color: #1f618d;
}

.tab-panel {
    display: none;
}

.tab-panel.active {
    display: block;
}

.error-message {
    background-color: #e74c3c;
    color: white;
    padding: 1rem;
    border-radius: 5px;
    text-align: center;
    margin-bottom: 20px;
}

.excel-views-container {
    display: grid;
    gap: 20px;
    margin-top: 20px;
}

.excel-view {
    background-color: white;
    border-radius: 8px;
    box-shadow: 0 2px 10px rgba(0,0,0,0.1);
    overflow: hidden;
    transition: transform 0.3s ease;
}

.excel-view:hover {
    transform: translateY(-5px);
}

.excel-header {
    background-color: #3498db;
    color: white;
    padding: 15px;
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.excel-title {
    font-size: 1.3rem;
    font-weight: bold;
}

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

.excel-action-btn {
    background-color: #2980b9;
    color: white;
    border: none;
    padding: 8px 12px;
    border-radius: 4px;
    cursor: pointer;
    transition: background-color 0.3s ease;
}

.excel-action-btn:hover {
    background-color: #3498db;
}

.excel-content {
    padding: 20px;
    min-height: 200px;
}

.excel-table {
    width: 100%;
    border-collapse: collapse;
    margin-top: 10px;
}

.excel-table th,
.excel-table td {
    border: 1px solid #ddd;
    padding: 12px;
    text-align: left;
}

.excel-table th {
    background-color: #ecf0f1;
    font-weight: bold;
}

.excel-table tr:nth-child(even) {
    background-color: #f9f9f9;
}

.excel-table tr:hover {
    background-color: #f1f1f1;
}

.primary-btn,
.secondary-btn,
.danger-btn,
.icon-btn {
    border: none;
    border-radius: 4px;
    cursor: pointer;
    font-size: 0.95rem;
    padding: 9px 13px;
    transition: background-color 0.2s ease, opacity 0.2s ease;
}

.primary-btn {
    background: #3498db;
    color: white;
}

.primary-btn:hover {
    background: #2980b9;
}

.secondary-btn {
    background: #ecf0f1;
    color: #2c3e50;
}

.secondary-btn:hover {
    background: #d8dee4;
}

.danger-btn {
    background: #e74c3c;
    color: white;
}

.danger-btn:hover {
    background: #c0392b;
}

.icon-btn {
    background: transparent;
    color: #555;
    font-size: 1.6rem;
    line-height: 1;
    padding: 4px 8px;
}

button:disabled {
    cursor: not-allowed;
    opacity: 0.65;
}

.login-screen {
    align-items: center;
    display: flex;
    justify-content: center;
    min-height: calc(100vh - 75px);
    padding: 24px;
}

.login-card {
    background: white;
    border-radius: 10px;
    box-shadow: 0 10px 35px rgba(0,0,0,0.12);
    display: flex;
    flex-direction: column;
    gap: 14px;
    max-width: 420px;
    padding: 28px;
    width: 100%;
}

.login-card h2 {
    color: #2c3e50;
    font-size: 1.8rem;
}

.login-card label {
    color: #333;
    display: flex;
    flex-direction: column;
    font-weight: 600;
    gap: 6px;
}

.login-card input {
    border: 1px solid #ccd0d5;
    border-radius: 4px;
    font: inherit;
    padding: 10px 12px;
}

.login-card button {
    margin-top: 4px;
}

.status-message {
    border-radius: 5px;
    margin: 12px 0;
    padding: 10px 12px;
}

.status-message.info {
    background: #eaf4ff;
    color: #1f618d;
}

.status-message.success {
    background: #eafaf1;
    color: #1e8449;
}

.status-message.warning {
    background: #fff4e5;
    color: #b9770e;
}

.status-message.error,
.error-inline {
    background: #fdecea;
    color: #c0392b;
}

/* Zoom Meetings Section */
.zoom-meetings-section {
    background-color: white;
    border-radius: 8px;
    box-shadow: 0 2px 10px rgba(0,0,0,0.1);
    padding: 20px;
    margin-top: 30px;
}

.zoom-web-auth-panel {
    border: 1px solid #d8dee4;
    border-radius: 6px;
    padding: 12px;
    margin: 12px 0 18px;
    background: #f8fafc;
}

.zoom-web-auth-panel summary {
    cursor: pointer;
    font-weight: 600;
}

.zoom-web-auth-toggle {
    display: block;
    margin: 12px 0 6px;
}

.zoom-web-auth-note {
    color: #555;
    font-size: 0.92rem;
    margin-bottom: 8px;
}

.zoom-web-curl {
    width: 100%;
    font-family: Consolas, Monaco, 'Courier New', monospace;
    font-size: 0.85rem;
    padding: 10px;
    border: 1px solid #ccd0d5;
    border-radius: 4px;
    resize: vertical;
}

.recordings-backup-panel {
    align-items: start;
    background: #f8fafc;
    border: 1px solid #d8dee4;
    border-radius: 8px;
    display: grid;
    gap: 12px;
    grid-template-columns: 1fr auto;
    margin: 12px 0 18px;
    padding: 14px;
}

.recordings-backup-actions {
    display: flex;
    flex-wrap: wrap;
    gap: 10px;
}

.recordings-progress-wrap,
#recordings-backup-message {
    grid-column: 1 / -1;
}

.recordings-progress-wrap {
    align-items: center;
    gap: 10px;
}

.recordings-progress-wrap progress {
    flex: 1;
    min-width: 220px;
}

#recordings-progress-label {
    color: #555;
    font-size: 0.9rem;
    overflow-wrap: anywhere;
}

.meeting-buttons {
    display: flex;
    gap: 10px;
    flex-wrap: wrap;
    margin-bottom: 20px;
}

.meeting-button {
    background-color: #3498db;
    color: white;
    border: none;
    padding: 10px 15px;
    border-radius: 4px;
    cursor: pointer;
    transition: all 0.3s ease;
    font-size: 1rem;
}

.meeting-button:hover {
    background-color: #2980b9;
}

.meeting-button.active {
    background-color: #27ae60;
    font-weight: bold;
}

.meeting-table {
    width: 100%;
    border-collapse: collapse;
    margin-top: 10px;
}

.meeting-table th,
.meeting-table td {
    border: 1px solid #ddd;
    padding: 12px;
    text-align: left;
}

.meeting-table th {
    background-color: #ecf0f1;
    font-weight: bold;
}

.meeting-table tr:nth-child(even) {
    background-color: #f9f9f9;
}

.meeting-table tr:hover {
    background-color: #f1f1f1;
}

.download-report-btn {
    background-color: #27ae60;
    color: white;
    border: none;
    padding: 8px 12px;
    border-radius: 4px;
    cursor: pointer;
    transition: background-color 0.3s ease;
    font-size: 0.9rem;
}

.download-report-btn:hover {
    background-color: #2ecc71;
}

.attendance-match-report {
    margin-top: 24px;
    overflow-x: auto;
}

.attendance-match-table {
    width: 100%;
    border-collapse: collapse;
    margin-top: 10px;
    font-size: 0.95rem;
}

.attendance-match-table th,
.attendance-match-table td {
    border: 1px solid #ddd;
    padding: 10px;
    text-align: left;
    vertical-align: top;
}

.attendance-match-table th {
    background-color: #ecf0f1;
    font-weight: bold;
}

.attendance-match-table tr:nth-child(even) {
    background-color: #f9f9f9;
}

.copy-hint {
    color: #555;
    margin: 8px 0;
}

.groups-section {
    background-color: white;
    border-radius: 8px;
    box-shadow: 0 2px 10px rgba(0,0,0,0.1);
    padding: 20px;
}

.section-header {
    align-items: flex-start;
    display: flex;
    gap: 16px;
    justify-content: space-between;
    margin-bottom: 16px;
}

.oauth-panel {
    align-items: center;
    background: #f8fafc;
    border: 1px solid #d8dee4;
    border-radius: 8px;
    display: flex;
    gap: 16px;
    justify-content: space-between;
    margin: 14px 0 18px;
    padding: 14px;
}

.oauth-actions {
    display: flex;
    flex-wrap: wrap;
    gap: 10px;
    justify-content: flex-end;
}

.small-text {
    font-size: 0.86rem;
    word-break: break-all;
}

.success-text {
    color: #1e8449;
}

.warn-text {
    color: #b9770e;
}

.error-text {
    color: #c0392b;
}

.groups-table {
    width: 100%;
    border-collapse: collapse;
}

.groups-table th,
.groups-table td {
    border: 1px solid #ddd;
    padding: 10px;
    text-align: left;
    vertical-align: top;
}

.groups-table th {
    background-color: #ecf0f1;
    font-weight: bold;
}

.groups-table tr:nth-child(even) {
    background-color: #f9f9f9;
}

.group-dialog {
    border: none;
    border-radius: 10px;
    box-shadow: 0 20px 60px rgba(0,0,0,0.3);
    max-width: 760px;
    padding: 0;
    width: min(760px, calc(100vw - 32px));
}

.group-dialog::backdrop {
    background: rgba(0,0,0,0.45);
}

.group-dialog form {
    padding: 22px;
}

.dialog-header {
    align-items: center;
    display: flex;
    justify-content: space-between;
    margin-bottom: 16px;
}

.form-grid {
    display: grid;
    gap: 12px;
    grid-template-columns: repeat(4, 1fr);
    margin-bottom: 14px;
}

.form-grid label,
.users-label {
    color: #333;
    display: flex;
    flex-direction: column;
    font-weight: 600;
    gap: 6px;
}

.form-grid input,
.form-grid select,
.users-label textarea {
    border: 1px solid #ccd0d5;
    border-radius: 4px;
    font: inherit;
    padding: 9px 10px;
}

.users-label textarea {
    font-family: Consolas, Monaco, 'Courier New', monospace;
    resize: vertical;
}

.dialog-actions {
    display: flex;
    gap: 10px;
    justify-content: flex-end;
    margin-top: 16px;
}

.certainty-high {
    color: #1e8449;
    font-weight: bold;
}

.certainty-medium {
    color: #b9770e;
    font-weight: bold;
}

.certainty-low {
    color: #c0392b;
    font-weight: bold;
}

/* Responsive design */
@media (max-width: 768px) {
    .container {
        padding: 10px;
    }
    
    .excel-views-container {
        grid-template-columns: 1fr;
    }
    
    .excel-header {
        flex-direction: column;
        gap: 10px;
        text-align: center;
    }
    
    .meeting-buttons {
        flex-direction: column;
    }
    
    .meeting-button {
        width: 100%;
    }

    .section-header,
    .oauth-panel {
        align-items: stretch;
        flex-direction: column;
    }

    .recordings-backup-panel {
        grid-template-columns: 1fr;
    }

    .oauth-actions {
        justify-content: flex-start;
    }

    .form-grid {
        grid-template-columns: 1fr;
    }
    
    .header-content {
        align-items: stretch;
        flex-direction: column;
        text-align: center;
    }

    h1 {
        font-size: 1.5rem;
    }
}