:root {
    --background: #e3e5e7;
    --text: #555555;
    --text-light: #888888;
    --shadow-light: #fafafd;
    --shadow-dark: #b6b9ba;
    --gradient-light: #f4f6f8;
    --gradient-dark: #b6b9ba;
    
    --primary-color: #409eff;
    --primary-light: #66b1ff;
    --primary-dark: #3a8ee6;
    
    --secondary-color: #909399;
    --secondary-light: #a6a9ad;
    --secondary-dark: #86898e;
    
    --danger-color: #f56c6c;
    --danger-light: #f78989;
    --danger-dark: #e76161;
    
    --success-color: #67c23a;
    --warning-color: #e6a23c;
    
    --birthday-color: #409eff;
    --group-color: #67c23a;
    --reminder-color: #e6a23c;
    --settings-color: #909399;
}

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

body {
    background: var(--background);
    min-height: 100vh;
    font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, 'Helvetica Neue', Arial, sans-serif;
    color: var(--text);
}

.container {
    max-width: 1400px;
    margin: 0 auto;
    padding: 10px;
}

.page {
    display: none;
}

.page.active {
    display: block;
}

.login-container {
    width: 420px;
    padding: 48px;
    border-radius: 30px;
    background: var(--background);
    box-shadow: 
        20px 20px 60px var(--shadow-dark),
        -20px -20px 60px var(--shadow-light);
    margin: 50px auto;
}

.login-container h1 {
    text-align: center;
    color: var(--text);
    margin-bottom: 32px;
    font-size: 32px;
    font-weight: 700;
    letter-spacing: -0.02em;
}

.form-group {
    margin-bottom: 24px;
}

.form-group label {
    display: block;
    margin-bottom: 8px;
    font-weight: 600;
    color: var(--text);
    font-size: 14px;
}

.form-group input:not([type="checkbox"]),
.form-group select {
    width: 100%;
    padding: 16px 20px;
    border: none;
    border-radius: 16px;
    background: var(--background);
    box-shadow: 
        inset 6px 6px 12px var(--shadow-dark),
        inset -6px -6px 12px var(--shadow-light);
    font-size: 16px;
    color: var(--text);
    outline: none;
    transition: all 0.3s ease;
    font-family: inherit;
    appearance: none;
    cursor: pointer;
    background-image: url("data:image/svg+xml;charset=utf-8,%3Csvg xmlns='http://www.w3.org/2000/svg' viewBox='0 0 10 6'%3E%3Cpath fill='%23555555' d='M1 1l4 4 4-4z'/%3E%3C/svg%3E");
    background-repeat: no-repeat;
    background-position: right 20px center;
    background-size: 10px 6px;
    padding-right: 40px;
}

.form-group input:not([type="checkbox"])::placeholder {
    color: var(--text-light);
}

.form-group input:not([type="checkbox"]):focus,
.form-group select:focus {
    box-shadow: 
        inset 8px 8px 16px var(--shadow-dark),
        inset -8px -8px 16px var(--shadow-light);
}

.form-group input:not([type="checkbox"]):hover:not(:focus),
.form-group select:hover:not(:focus) {
    box-shadow: 
        inset 7px 7px 14px var(--shadow-dark),
        inset -7px -7px 14px var(--shadow-light);
}

.form-group input[type="checkbox"] {
    width: 18px;
    height: 18px;
    border: none;
    border-radius: 4px;
    background: var(--background);
    box-shadow: 
        inset 3px 3px 6px var(--shadow-dark),
        inset -3px -3px 6px var(--shadow-light);
    cursor: pointer;
    transition: all 0.3s ease;
    appearance: none;
    position: relative;
}

.form-group input[type="checkbox"]:checked {
    background: var(--background);
    box-shadow: 
        inset 3px 3px 6px var(--shadow-dark),
        inset -3px -3px 6px var(--shadow-light);
}

.form-group input[type="checkbox"]:checked::after {
    content: '✓';
    position: absolute;
    top: 50%;
    left: 50%;
    transform: translate(-50%, -50%);
    color: var(--text);
    font-size: 12px;
    font-weight: bold;
}

.form-group input[type="checkbox"]:focus {
    outline: none;
    box-shadow: 
        inset 3px 3px 6px var(--shadow-dark),
        inset -3px -3px 6px var(--shadow-light),
        0 0 0 3px rgba(182, 185, 186, 0.3);
}

.form-actions {
    display: flex;
    gap: 10px;
    justify-content: center;
    margin-top: 20px;
}

.form-row {
    display: flex;
    gap: 20px;
    margin-bottom: 20px;
}

.form-row .form-group {
    flex: 1;
    margin-bottom: 0;
}

.checkbox-group {
    display: flex;
    gap: 20px;
    margin-top: 10px;
}

.checkbox-group label {
    font-weight: normal;
    cursor: pointer;
    display: flex;
    align-items: center;
    gap: 8px;
    color: var(--text-light);
}

.btn {
    padding: 16px 24px;
    border: none;
    border-radius: 16px;
    background: var(--background);
    box-shadow: 
        8px 8px 16px var(--shadow-dark),
        -8px -8px 16px var(--shadow-light);
    background-image: linear-gradient(145deg, var(--gradient-light), var(--gradient-dark));
    font-size: 16px;
    font-weight: 600;
    color: var(--text);
    cursor: pointer;
    transition: all 0.3s ease;
    font-family: inherit;
    display: inline-flex;
    align-items: center;
    justify-content: center;
    text-align: center;
    white-space: nowrap;
    user-select: none;
    outline: none;
}

.btn:hover {
    background-image: linear-gradient(145deg, var(--gradient-dark), var(--gradient-light));
    box-shadow: 
        6px 6px 12px var(--shadow-dark),
        -6px -6px 12px var(--shadow-light);
}

.btn:active {
    background-image: linear-gradient(145deg, var(--gradient-dark), var(--gradient-light));
    box-shadow: 
        inset 6px 6px 12px var(--shadow-dark),
        inset -6px -6px 12px var(--shadow-light);
    transform: translateY(2px);
}

.btn:focus {
    outline: none;
    box-shadow: 
        8px 8px 16px var(--shadow-dark),
        -8px -8px 16px var(--shadow-light),
        0 0 0 3px rgba(182, 185, 186, 0.3);
}

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

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

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

.btn-secondary:hover {
    color: var(--secondary-light);
}

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

.btn-danger:hover {
    color: var(--danger-light);
}

.btn-success {
    color: var(--success-color);
}

.btn-success:hover {
    filter: brightness(1.1);
}

.btn-warning {
    color: var(--warning-color);
}

.btn-warning:hover {
    filter: brightness(1.1);
}

.navbar {
    background: var(--background);
    box-shadow: 
        12px 12px 24px var(--shadow-dark),
        -12px -12px 24px var(--shadow-light);
    color: var(--text);
    padding: 16px 24px;
    margin-bottom: 20px;
    display: flex;
    justify-content: space-between;
    align-items: center;
    border-radius: 24px;
}

.navbar h1 {
    margin: 0;
    font-size: 24px;
    font-weight: 700;
    color: var(--text);
}

.nav-right {
    display: flex;
    align-items: center;
    gap: 12px;
}

.main-container {
    display: flex;
    gap: 20px;
    margin-top: 20px;
}

.sidebar {
    width: 200px;
    background: var(--background);
    box-shadow: 
        12px 12px 24px var(--shadow-dark),
        -12px -12px 24px var(--shadow-light);
    padding: 20px;
    border-radius: 24px;
}

.sidebar-btn {
    display: block;
    width: 100%;
    padding: 16px;
    margin-bottom: 12px;
    border: none;
    border-radius: 16px;
    background: var(--background);
    box-shadow: 
        6px 6px 12px var(--shadow-dark),
        -6px -6px 12px var(--shadow-light);
    cursor: pointer;
    transition: all 0.3s ease;
    text-align: center;
    font-size: 16px;
    font-weight: 500;
    color: var(--text);
    font-family: inherit;
}

.sidebar-btn:hover {
    box-shadow: 
        4px 4px 8px var(--shadow-dark),
        -4px -4px 8px var(--shadow-light);
}

.sidebar-btn[data-tab="birthdays"]:hover {
    color: var(--birthday-color);
}

.sidebar-btn[data-tab="groups"]:hover {
    color: var(--group-color);
}

.sidebar-btn[data-tab="reminder"]:hover {
    color: var(--reminder-color);
}

.sidebar-btn[data-tab="settings"]:hover {
    color: var(--settings-color);
}

.sidebar-btn.active {
    box-shadow: 
        inset 4px 4px 8px var(--shadow-dark),
        inset -4px -4px 8px var(--shadow-light);
}

.sidebar-btn[data-tab="birthdays"].active {
    color: var(--birthday-color);
}

.sidebar-btn[data-tab="groups"].active {
    color: var(--group-color);
}

.sidebar-btn[data-tab="reminder"].active {
    color: var(--reminder-color);
}

.sidebar-btn[data-tab="settings"].active {
    color: var(--settings-color);
}

.content {
    flex: 1;
    background: var(--background);
    box-shadow: 
        12px 12px 24px var(--shadow-dark),
        -12px -12px 24px var(--shadow-light);
    padding: 24px;
    border-radius: 24px;
}

.tab-content {
    background: var(--background);
    padding: 0;
}

.tab-pane {
    display: none;
    padding: 0;
}

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

.tabs {
    display: flex;
    gap: 10px;
    margin-bottom: 20px;
}

.tab-btn {
    padding: 12px 20px;
    border: none;
    border-radius: 12px;
    background: var(--background);
    box-shadow: 
        4px 4px 8px var(--shadow-dark),
        -4px -4px 8px var(--shadow-light);
    cursor: pointer;
    transition: all 0.3s ease;
    font-family: inherit;
    font-size: 14px;
    color: var(--text);
}

.tab-btn:hover {
    box-shadow: 
        2px 2px 4px var(--shadow-dark),
        -2px -2px 4px var(--shadow-light);
}

.tab-btn.active {
    box-shadow: 
        inset 4px 4px 8px var(--shadow-dark),
        inset -4px -4px 8px var(--shadow-light);
    color: var(--primary-color);
}

.info-display {
    padding: 16px;
    background: var(--background);
    box-shadow: 
        inset 4px 4px 8px var(--shadow-dark),
        inset -4px -4px 8px var(--shadow-light);
    border-radius: 12px;
    font-size: 14px;
    color: var(--text);
}

.page-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 24px;
    padding-bottom: 16px;
    gap: 12px;
}

.page-header h2 {
    margin: 0;
    font-size: 24px;
    color: var(--text);
    font-weight: 700;
    flex-shrink: 0;
}

.page-header[data-module="birthdays"] h2 {
    color: var(--birthday-color);
}

.page-header[data-module="groups"] h2 {
    color: var(--group-color);
}

.page-header[data-module="reminder"] h2 {
    color: var(--reminder-color);
}

.page-header[data-module="settings"] h2 {
    color: var(--settings-color);
}

.page-header .action-buttons {
    display: flex;
    gap: 10px;
    flex-shrink: 0;
}

.search-filter {
    display: flex;
    gap: 12px;
    margin-bottom: 20px;
    align-items: center;
}

.search-filter select {
    padding: 12px 40px 12px 16px;
    border: none;
    border-radius: 12px;
    background: var(--background);
    box-shadow: 
        inset 4px 4px 8px var(--shadow-dark),
        inset -4px -4px 8px var(--shadow-light);
    font-size: 16px;
    color: var(--text);
    font-family: inherit;
    cursor: pointer;
    appearance: none;
    background-image: url("data:image/svg+xml;charset=utf-8,%3Csvg xmlns='http://www.w3.org/2000/svg' viewBox='0 0 10 6'%3E%3Cpath fill='%23555555' d='M1 1l4 4 4-4z'/%3E%3C/svg%3E");
    background-repeat: no-repeat;
    background-position: right 16px center;
    background-size: 10px 6px;
    text-align: center;
}

.search-filter select:hover:not(:focus) {
    box-shadow: 
        inset 5px 5px 10px var(--shadow-dark),
        inset -5px -5px 10px var(--shadow-light);
}

.search-filter select:focus {
    outline: none;
    box-shadow: 
        inset 6px 6px 12px var(--shadow-dark),
        inset -6px -6px 12px var(--shadow-light);
}

.search-input {
    padding: 12px 16px;
    border: none;
    border-radius: 12px;
    background: var(--background);
    box-shadow: 
        inset 4px 4px 8px var(--shadow-dark),
        inset -4px -4px 8px var(--shadow-light);
    font-size: 16px;
    flex: 1;
    max-width: 300px;
    color: var(--text);
    font-family: inherit;
}

.search-input::placeholder {
    color: var(--text-light);
}

.search-input:focus {
    outline: none;
    box-shadow: 
        inset 6px 6px 12px var(--shadow-dark),
        inset -6px -6px 12px var(--shadow-light);
}

.table-container {
    overflow-x: auto;
    background: var(--background);
    box-shadow: 
        8px 8px 16px var(--shadow-dark),
        -8px -8px 16px var(--shadow-light);
    border-radius: 20px;
    padding: 16px;
}

.data-table {
    width: 100%;
    min-width: 1000px;
    border-collapse: collapse;
}

.data-table th,
.data-table td {
    padding: 14px;
    text-align: left;
    border-bottom: 1px solid var(--shadow-dark);
    white-space: nowrap;
    overflow: hidden;
    text-overflow: ellipsis;
}

.data-table th:nth-child(1),
.data-table td:nth-child(1) {
    width: 50px;
    text-align: center;
}

#groups-table th:nth-child(1),
#groups-table td:nth-child(1) {
    width: 50px;
    text-align: center;
}

#groups-table th:nth-child(2),
#groups-table td:nth-child(2) {
    width: auto;
}

#groups-table th:nth-child(3),
#groups-table td:nth-child(3) {
    width: 200px;
}

.data-table th:nth-child(2),
.data-table td:nth-child(2) {
    width: 60px;
}

.data-table th:nth-child(3),
.data-table td:nth-child(3) {
    width: 100px;
}

.data-table th:nth-child(4),
.data-table td:nth-child(4) {
    width: 60px;
}

.data-table th:nth-child(5),
.data-table td:nth-child(5) {
    width: 150px;
}

.data-table th:nth-child(6),
.data-table td:nth-child(6) {
    width: 60px;
}

.data-table th:nth-child(7),
.data-table td:nth-child(7) {
    width: 60px;
}

.data-table th:nth-child(8),
.data-table td:nth-child(8) {
    width: 80px;
}

.data-table th:nth-child(9),
.data-table td:nth-child(9) {
    width: 120px;
}

.data-table th:nth-child(10),
.data-table td:nth-child(10) {
    width: 100px;
}

.data-table th:nth-child(11),
.data-table td:nth-child(11) {
    width: 80px;
}

.data-table th {
    font-weight: 600;
    color: var(--text);
}

.data-table tr:hover td {
    background: var(--gradient-light);
}

.data-table input[type="checkbox"] {
    width: 18px;
    height: 18px;
    border: none;
    border-radius: 4px;
    background: var(--background);
    box-shadow: 
        inset 3px 3px 6px var(--shadow-dark),
        inset -3px -3px 6px var(--shadow-light);
    cursor: pointer;
    transition: all 0.3s ease;
    appearance: none;
    position: relative;
}

.data-table input[type="checkbox"]:checked {
    background: var(--background);
    box-shadow: 
        inset 3px 3px 6px var(--shadow-dark),
        inset -3px -3px 6px var(--shadow-light);
}

.data-table input[type="checkbox"]:checked::after {
    content: '✓';
    position: absolute;
    top: 50%;
    left: 50%;
    transform: translate(-50%, -50%);
    color: var(--text);
    font-size: 12px;
    font-weight: bold;
}

.data-table input[type="checkbox"]:focus {
    outline: none;
    box-shadow: 
        inset 3px 3px 6px var(--shadow-dark),
        inset -3px -3px 6px var(--shadow-light),
        0 0 0 3px rgba(182, 185, 186, 0.3);
}

.action-buttons {
    display: flex;
    gap: 8px;
}

.action-btn {
    padding: 8px 12px;
    border: none;
    border-radius: 10px;
    background: var(--background);
    box-shadow: 
        4px 4px 8px var(--shadow-dark),
        -4px -4px 8px var(--shadow-light);
    font-size: 14px;
    cursor: pointer;
    transition: all 0.3s ease;
    font-family: inherit;
}

.action-btn:hover {
    box-shadow: 
        2px 2px 4px var(--shadow-dark),
        -2px -2px 4px var(--shadow-light);
}

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

.edit-btn:hover {
    color: var(--primary-light);
}

.delete-btn {
    color: var(--danger-color);
}

.delete-btn:hover {
    color: var(--danger-light);
}

.modal {
    display: none;
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: rgba(0, 0, 0, 0.5);
    z-index: 1000;
    justify-content: center;
    align-items: center;
}

.modal.show {
    display: flex;
}

.modal-content {
    background: var(--background);
    box-shadow: 
        20px 20px 60px var(--shadow-dark),
        -20px -20px 60px var(--shadow-light);
    border-radius: 24px;
    padding: 24px;
    width: 100%;
    max-width: 500px;
    max-height: 80vh;
    overflow-y: auto;
}

.modal-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 24px;
    padding-bottom: 16px;
}

.modal-header h3 {
    margin: 0;
    font-size: 20px;
    color: var(--text);
    font-weight: 700;
}

.close-btn {
    background: var(--background);
    box-shadow: 
        4px 4px 8px var(--shadow-dark),
        -4px -4px 8px var(--shadow-light);
    border: none;
    font-size: 24px;
    cursor: pointer;
    color: var(--text-light);
    padding: 0;
    width: 36px;
    height: 36px;
    display: flex;
    justify-content: center;
    align-items: center;
    border-radius: 10px;
    transition: all 0.3s ease;
    font-family: inherit;
}

.close-btn:hover {
    color: var(--text);
    box-shadow: 
        2px 2px 4px var(--shadow-dark),
        -2px -2px 4px var(--shadow-light);
}

.notification {
    position: fixed;
    top: 20px;
    right: 20px;
    padding: 16px 24px;
    border-radius: 16px;
    color: white;
    font-weight: 600;
    z-index: 1001;
    opacity: 0;
    transform: translateY(-20px);
    transition: all 0.3s ease;
    box-shadow: 
        8px 8px 16px rgba(0, 0, 0, 0.2),
        -8px -8px 16px rgba(255, 255, 255, 0.1);
}

.notification.show {
    opacity: 1;
    transform: translateY(0);
}

.notification.success {
    background: var(--success-color);
}

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

.notification.warning {
    background: var(--warning-color);
}

.settings-form {
    background: var(--background);
}

.settings-tabs {
    display: flex;
    gap: 10px;
    margin-bottom: 20px;
}

.settings-tabs .tab-btn {
    padding: 12px 20px;
    border: none;
    border-radius: 12px;
    background: var(--background);
    box-shadow: 
        4px 4px 8px var(--shadow-dark),
        -4px -4px 8px var(--shadow-light);
    cursor: pointer;
    transition: all 0.3s ease;
    font-family: inherit;
    font-size: 14px;
    color: var(--text);
}

.settings-tabs .tab-btn:hover {
    box-shadow: 
        2px 2px 4px var(--shadow-dark),
        -2px -2px 4px var(--shadow-light);
}

.settings-tabs .tab-btn.active {
    box-shadow: 
        inset 4px 4px 8px var(--shadow-dark),
        inset -4px -4px 8px var(--shadow-light);
    color: var(--primary-color);
}

.settings-tab-content {
    display: none;
}

.settings-tab-content.active {
    display: block;
}

.form-section {
    margin-bottom: 30px;
    padding: 24px;
    background: var(--background);
    box-shadow: 
        8px 8px 16px var(--shadow-dark),
        -8px -8px 16px var(--shadow-light);
    border-radius: 20px;
}

.form-section h3 {
    margin-bottom: 20px;
    color: var(--text);
    font-size: 18px;
    font-weight: 700;
}

input[type="date"],
input[type="time"] {
    width: 100%;
    padding: 16px 20px;
    border: none;
    border-radius: 16px;
    background: var(--background);
    box-shadow: 
        inset 4px 4px 8px var(--shadow-dark),
        inset -4px -4px 8px var(--shadow-light);
    font-size: 16px;
    color: var(--text);
    transition: all 0.3s ease;
    cursor: pointer;
    font-family: inherit;
    appearance: none;
}

input[type="date"]:hover,
input[type="time"]:hover {
    box-shadow: 
        inset 5px 5px 10px var(--shadow-dark),
        inset -5px -5px 10px var(--shadow-light);
}

input[type="date"]:focus,
input[type="time"]:focus {
    outline: none;
    box-shadow: 
        inset 6px 6px 12px var(--shadow-dark),
        inset -6px -6px 12px var(--shadow-light);
}

.pagination {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-top: 20px;
    padding: 16px;
    background: var(--background);
    box-shadow: 
        8px 8px 16px var(--shadow-dark),
        -8px -8px 16px var(--shadow-light);
    border-radius: 16px;
}

.pagination-info {
    display: flex;
    align-items: center;
    color: var(--text);
    font-size: 14px;
}

.pagination-controls {
    display: flex;
    align-items: center;
    gap: 10px;
}

.page-size-select {
    padding: 8px 12px;
    border: none;
    border-radius: 10px;
    background: var(--background);
    box-shadow: 
        inset 3px 3px 6px var(--shadow-dark),
        inset -3px -3px 6px var(--shadow-light);
    font-size: 14px;
    color: var(--text);
    font-family: inherit;
    cursor: pointer;
}

.jump-to-page {
    display: flex;
    align-items: center;
    gap: 6px;
}

.jump-input {
    width: 60px;
    padding: 8px 12px;
    border: none;
    border-radius: 10px;
    background: var(--background);
    box-shadow: 
        inset 3px 3px 6px var(--shadow-dark),
        inset -3px -3px 6px var(--shadow-light);
    font-size: 14px;
    text-align: center;
    color: var(--text);
    font-family: inherit;
}

.jump-to-page span {
    font-size: 14px;
    color: var(--text);
}

@media (max-width: 768px) {
    .main-container {
        flex-direction: column;
    }
    
    .sidebar {
        width: 100%;
        display: flex;
        flex-direction: row;
        gap: 8px;
        overflow-x: auto;
        padding: 10px;
        justify-content: space-around;
        -webkit-overflow-scrolling: touch;
    }
    
    .sidebar-btn {
        padding: 10px 14px;
        font-size: 13px;
        margin-bottom: 0;
        flex: 0 1 auto;
        white-space: normal;
        min-width: 0;
        text-align: center;
    }
    
    .sidebar-btn[data-tab="birthdays"]:hover {
        color: var(--birthday-color);
    }
    
    .sidebar-btn[data-tab="groups"]:hover {
        color: var(--group-color);
    }
    
    .sidebar-btn[data-tab="reminder"]:hover {
        color: var(--reminder-color);
    }
    
    .sidebar-btn[data-tab="settings"]:hover {
        color: var(--settings-color);
    }
    
    .sidebar-btn.active {
        box-shadow: 
            inset 4px 4px 8px var(--shadow-dark),
            inset -4px -4px 8px var(--shadow-light);
    }
    
    .sidebar-btn[data-tab="birthdays"].active {
        color: var(--birthday-color);
    }
    
    .sidebar-btn[data-tab="groups"].active {
        color: var(--group-color);
    }
    
    .sidebar-btn[data-tab="reminder"].active {
        color: var(--reminder-color);
    }
    
    .sidebar-btn[data-tab="settings"].active {
        color: var(--settings-color);
    }
    
    .content {
        padding: 16px;
    }
    
    .navbar {
        flex-direction: column;
        padding: 16px;
        gap: 12px;
    }
    
    .navbar h1 {
        font-size: 20px;
    }
    
    .navbar .nav-right {
        width: 100%;
        justify-content: center;
    }
    
    .page-header {
        flex-direction: column;
        align-items: stretch;
        gap: 12px;
    }
    
    .page-header h2 {
        font-size: 20px;
        text-align: center;
    }
    
    .page-header[data-module="birthdays"] h2 {
        color: var(--birthday-color);
    }
    
    .page-header[data-module="groups"] h2 {
        color: var(--group-color);
    }
    
    .page-header[data-module="reminder"] h2 {
        color: var(--reminder-color);
    }
    
    .page-header[data-module="settings"] h2 {
        color: var(--settings-color);
    }
    
    .page-header .action-buttons {
        width: 100%;
        justify-content: center;
    }
    
    .data-table {
        overflow-x: auto;
        font-size: 14px;
    }
    
    .table-container {
        padding: 12px;
        overflow-x: auto;
    }
    
    .form-row {
        flex-direction: column;
    }
    
    .search-filter {
        flex-direction: column;
        align-items: stretch;
    }
    
    .search-input {
        max-width: 100%;
    }
    
    .action-buttons {
        flex-direction: row;
        flex-wrap: wrap;
        gap: 8px;
        justify-content: center;
    }
    
    .action-buttons .btn {
        flex: 1;
        min-width: 70px;
        padding: 10px 14px;
        font-size: 13px;
    }
    
    .tabs {
        overflow-x: auto;
        padding-bottom: 10px;
    }
    
    .tab-btn {
        white-space: nowrap;
    }
    
    .pagination {
        flex-direction: column;
        gap: 12px;
    }
    
    .pagination-controls {
        flex-wrap: wrap;
        justify-content: center;
        gap: 8px;
    }
    
    .pagination-controls .btn {
        flex: 1;
        min-width: 50px;
        padding: 8px 12px;
        font-size: 12px;
    }
    
    .pagination-info {
        font-size: 12px;
        text-align: center;
        width: 100%;
    }
    
    .jump-to-page {
        flex-wrap: wrap;
        justify-content: center;
        gap: 8px;
        width: 100%;
    }
    
    .jump-input {
        width: 50px;
        font-size: 13px;
    }
    
    .modal-content {
        margin: 20px;
        padding: 16px;
        max-height: 85vh;
    }
    
    .modal-header h3 {
        font-size: 18px;
    }
    
    .form-group {
        margin-bottom: 16px;
    }
    
    .form-group label {
        font-size: 13px;
    }
    
    .form-group input,
    .form-group select {
        padding: 12px 16px;
        font-size: 14px;
    }
    
    .form-actions {
        flex-direction: row;
        flex-wrap: wrap;
        gap: 8px;
        justify-content: center;
    }
    
    .form-actions .btn {
        flex: 1;
        min-width: 100px;
    }
    
    .settings-form .form-actions {
        margin-top: 20px;
    }
    
    .settings-form .form-actions .btn {
        min-width: 100px;
        padding: 10px 14px;
        font-size: 13px;
    }
    
    .settings-form .form-group[style*="display: flex"] {
        flex-direction: column;
    }
    
    .settings-form .form-group[style*="display: flex"] > div[style*="display: flex"] {
        flex-direction: row;
        flex-wrap: wrap;
        gap: 8px;
        width: 100%;
    }
    
    .settings-form .form-group[style*="display: flex"] > div[style*="display: flex"] input {
        flex: 1;
        min-width: 0;
    }
    
    .settings-form .form-group[style*="display: flex"] > div[style*="display: flex"] .btn {
        flex-shrink: 0;
        min-width: 100px;
        padding: 12px 16px;
        font-size: 14px;
    }
    
    .mobile-nav {
        position: fixed;
        bottom: 0;
        left: 0;
        right: 0;
        display: flex;
        justify-content: space-around;
        padding: 12px 8px;
        background: var(--background);
        box-shadow: 
            0 -4px 12px var(--shadow-dark),
            0 4px 12px var(--shadow-light);
        z-index: 1000;
        gap: 6px;
    }
    
    .mobile-nav-btn {
        flex: 1;
        padding: 14px 8px;
        border: none;
        border-radius: 12px;
        background: var(--background);
        box-shadow: 
            4px 4px 8px var(--shadow-dark),
            -4px -4px 8px var(--shadow-light);
        font-size: 15px;
        font-weight: 500;
        color: var(--text);
        cursor: pointer;
        transition: all 0.3s ease;
        white-space: nowrap;
        text-align: center;
    }
    
    .mobile-nav-btn:hover {
        box-shadow: 
            6px 6px 12px var(--shadow-dark),
            -6px -6px 12px var(--shadow-light);
    }
    
    .mobile-nav-btn[data-tab="birthdays"]:hover,
    .mobile-nav-btn[data-tab="birthdays"].active {
        color: var(--birthday-color);
    }
    
    .mobile-nav-btn[data-tab="groups"]:hover,
    .mobile-nav-btn[data-tab="groups"].active {
        color: var(--group-color);
    }
    
    .mobile-nav-btn[data-tab="reminder"]:hover,
    .mobile-nav-btn[data-tab="reminder"].active {
        color: var(--reminder-color);
    }
    
    .mobile-nav-btn[data-tab="settings"]:hover,
    .mobile-nav-btn[data-tab="settings"].active {
        color: var(--settings-color);
    }
    
    .mobile-nav-btn.active {
        box-shadow: 
            inset 4px 4px 8px var(--shadow-dark),
            inset -4px -4px 8px var(--shadow-light);
    }
    
    .content {
        padding-bottom: 80px;
    }
}

@media (max-width: 480px) {
    .login-container {
        width: 90%;
        padding: 32px 24px;
        margin: 20px auto;
    }
    
    .login-container h1 {
        font-size: 28px;
        margin-bottom: 24px;
    }
    
    .form-actions {
        flex-direction: column;
    }
    
    .modal-content {
        margin: 20px;
        padding: 16px;
    }
}

@media (min-width: 768px) {
    .login-container {
        width: 440px;
        padding: 56px;
    }
}

@media (min-width: 1024px) {
    .login-container {
        width: 460px;
        padding: 64px;
    }
}

@media (prefers-reduced-motion: reduce) {
    *,
    *::before,
    *::after {
        animation-duration: 0.01ms !important;
        animation-iteration-count: 1 !important;
        transition-duration: 0.01ms !important;
    }
}