:root {
    --primary-color: #2c3e50;
    --secondary-color: #3498db;
    --success-color: #27ae60;
    --warning-color: #f39c12;
    --danger-color: #e74c3c;
    --light-bg: #ecf0f1;
    --white: #ffffff;
    --text-dark: #2c3e50;
    --text-light: #7f8c8d;
    --border-color: #bdc3c7;
}

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

body {
    font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, Oxygen, Ubuntu, Cantarell, sans-serif;
    background-color: var(--light-bg);
    color: var(--text-dark);
    line-height: 1.6;
}

/* Login Page Styles */
.login-page {
    display: none;
    flex-direction: column;
    justify-content: center;
    align-items: center;
    min-height: 100vh;
    background: linear-gradient(135deg, var(--primary-color), var(--secondary-color));
}

.login-container {
    background: var(--white);
    padding: 40px;
    border-radius: 12px;
    box-shadow: 0 10px 40px rgba(0,0,0,0.2);
    max-width: 400px;
    width: 100%;
}

.login-container h1 {
    text-align: center;
    margin-bottom: 30px;
    font-size: 2em;
}

.login-form {
    display: none;
}

.login-form.active,
.login-form:first-of-type {
    display: block;
}

.login-form h2 {
    margin-bottom: 20px;
    color: var(--primary-color);
    font-size: 1.5em;
}

.login-form .form-group {
    margin-bottom: 20px;
}

.login-form label {
    display: block;
    margin-bottom: 8px;
    font-weight: 500;
    color: var(--text-dark);
}

.login-form input {
    width: 100%;
    padding: 12px;
    border: 1px solid var(--border-color);
    border-radius: 6px;
    font-size: 1em;
}

.login-form input:focus {
    outline: none;
    border-color: var(--secondary-color);
    box-shadow: 0 0 5px rgba(52, 152, 219, 0.3);
}

.login-toggle {
    text-align: center;
    margin-top: 15px;
    font-size: 0.9em;
}

.login-toggle button {
    background: none;
    border: none;
    color: var(--secondary-color);
    cursor: pointer;
    text-decoration: underline;
    padding: 0;
    font: inherit;
}

.login-info {
    text-align: center;
    margin-top: 15px;
    font-size: 0.9em;
    color: var(--text-light);
    font-style: italic;
}

.error-message {
    background-color: #ffebee;
    color: var(--danger-color);
    padding: 12px;
    border-radius: 6px;
    margin-bottom: 20px;
    border-left: 4px solid var(--danger-color);
}

/* Main App Styles */
.main-app {
    display: none;
}

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

header {
    background: var(--primary-color);
    color: var(--white);
    padding: 40px 20px;
    border-radius: 8px;
    margin-bottom: 30px;
    text-align: center;
    box-shadow: 0 2px 4px rgba(0,0,0,0.1);
}

.header-top {
    display: flex;
    justify-content: space-between;
    align-items: center;
    text-align: left;
}

.header-top h1 {
    flex: 1;
    font-size: 2.5em;
}

.user-menu {
    position: relative;
    display: flex;
    align-items: center;
    gap: 10px;
}

.user-menu span {
    white-space: nowrap;
}

#userMenuBtn {
    background: rgba(255,255,255,0.2);
    color: var(--white);
    border: none;
    padding: 8px 16px;
    border-radius: 6px;
    cursor: pointer;
    font-size: 1.2em;
}

#userMenuBtn:hover {
    background: rgba(255,255,255,0.3);
}

.user-dropdown {
    position: absolute;
    top: 100%;
    right: 0;
    background: var(--white);
    border: 1px solid var(--border-color);
    border-radius: 6px;
    min-width: 150px;
    box-shadow: 0 4px 12px rgba(0,0,0,0.15);
    z-index: 1000;
}

.dropdown-item {
    display: block;
    width: 100%;
    padding: 12px 20px;
    border: none;
    background: none;
    text-align: left;
    cursor: pointer;
    font-size: 1em;
    color: var(--text-dark);
    border-bottom: 1px solid var(--light-bg);
}

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

.dropdown-item:hover {
    background-color: var(--light-bg);
}

header h1 {
    font-size: 2.5em;
    margin-bottom: 10px;
}
}

main {
    margin-bottom: 40px;
}

section {
    background: var(--white);
    padding: 25px;
    border-radius: 8px;
    box-shadow: 0 2px 4px rgba(0,0,0,0.1);
}

h2 {
    color: var(--primary-color);
    margin-bottom: 20px;
    font-size: 1.5em;
    border-bottom: 2px solid var(--secondary-color);
    padding-bottom: 10px;
}

.form-group {
    margin-bottom: 20px;
}

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

input[type="text"],
input[type="number"],
input[type="password"],
select {
    width: 100%;
    padding: 12px;
    border: 1px solid var(--border-color);
    border-radius: 4px;
    font-size: 1em;
    font-family: inherit;
    transition: border-color 0.2s;
}

input[type="text"]:focus,
input[type="number"]:focus,
input[type="password"]:focus,
select:focus {
    outline: none;
    border-color: var(--secondary-color);
    box-shadow: 0 0 5px rgba(52, 152, 219, 0.3);
}

.form-row {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 15px;
}

.btn {
    padding: 12px 24px;
    border: none;
    border-radius: 4px;
    font-size: 1em;
    font-weight: 600;
    cursor: pointer;
    transition: all 0.2s;
    text-align: center;
}

.btn-primary {
    background-color: var(--secondary-color);
    color: var(--white);
    width: 100%;
}

.btn-primary:hover {
    background-color: #2980b9;
    box-shadow: 0 2px 8px rgba(52, 152, 219, 0.4);
}

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

.btn-secondary:hover {
    background-color: #5a686f;
}

.btn-success {
    background-color: var(--success-color);
    color: var(--white);
    padding: 8px 16px;
    font-size: 0.9em;
}

.btn-success:hover {
    background-color: #229954;
}

.btn-warning {
    background-color: var(--warning-color);
    color: var(--white);
    padding: 8px 16px;
    font-size: 0.9em;
}

.btn-warning:hover {
    background-color: #d68910;
}

.btn-danger {
    background-color: var(--danger-color);
    color: var(--white);
    padding: 8px 16px;
    font-size: 0.9em;
}

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

.btn-info {
    background-color: #17a2b8;
    color: var(--white);
    padding: 8px 16px;
    font-size: 0.9em;
}

.btn-info:hover {
    background-color: #138496;
}

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

.section-header h2 {
    margin-bottom: 15px;
}

.header-actions {
    margin-bottom: 15px;
    display: flex;
    gap: 10px;
    width: fit-content;
}

.filters {
    display: flex;
    gap: 10px;
}

.filter-btn {
    padding: 8px 16px;
    border: 1px solid var(--border-color);
    background: var(--white);
    border-radius: 4px;
    cursor: pointer;
    transition: all 0.2s;
    color: var(--text-dark);
}

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

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

.drugs-list {
    display: flex;
    flex-direction: column;
    gap: 8px;
}

.drug-item {
    display: flex;
    align-items: center;
    padding: 12px 16px;
    background: var(--white);
    border: 1px solid var(--border-color);
    border-radius: 6px;
    transition: all 0.2s;
    font-size: 0.95em;
    cursor: pointer;
}

.drug-item:hover {
    box-shadow: 0 2px 8px rgba(0,0,0,0.1);
    transform: translateY(-1px);
}

.drug-item.low-stock {
    border-left: 4px solid var(--warning-color);
    background: #fffdf0;
}

.drug-info {
    flex: 1;
    display: flex;
    align-items: center;
    gap: 16px;
}

.drug-name {
    font-weight: 600;
    color: var(--primary-color);
    min-width: 200px;
}

.drug-description {
    color: var(--text-light);
    font-size: 0.9em;
    flex: 1;
}

.drug-quantity {
    font-weight: 600;
    color: var(--primary-color);
    min-width: 100px;
    text-align: center;
}

.drug-unit {
    color: var(--text-light);
    min-width: 80px;
}

.drug-status {
    min-width: 100px;
    text-align: center;
}

.drug-badge {
    display: inline-block;
    padding: 4px 12px;
    border-radius: 20px;
    font-size: 0.8em;
    font-weight: 600;
}

.badge-normal {
    background-color: #d5f4e6;
    color: var(--success-color);
}

.badge-low {
    background-color: #fdeef0;
    color: var(--danger-color);
}

.drug-actions {
    display: flex;
    gap: 8px;
    margin-left: 16px;
    align-items: center;
}

.expand-icon {
    font-size: 1.2em;
    color: var(--text-light);
    cursor: pointer;
    margin-left: 8px;
    transition: transform 0.2s;
}

.drug-item.expanded .expand-icon {
    transform: rotate(90deg);
}

.drug-variants {
    max-height: 0;
    overflow: hidden;
    transition: max-height 0.3s ease-in-out;
    margin-top: 12px;
    padding: 0 16px;
    display: flex;
    flex-direction: column;
    gap: 12px;
}

.drug-variants.expanded {
    max-height: 1000px; /* Adjust based on content */
}

.btn-small {
    padding: 6px 12px;
    font-size: 0.85em;
    border-radius: 4px;
}

.loading {
    text-align: center;
    color: var(--text-light);
    padding: 40px;
    font-style: italic;
}

.empty {
    text-align: center;
    color: var(--text-light);
    padding: 40px;
}

footer {
    background: var(--primary-color);
    color: var(--white);
    text-align: center;
    padding: 20px;
    border-radius: 8px;
}

/* Actions Section */
.actions-section {
    margin-bottom: 30px;
}

.action-buttons {
    display: flex;
    gap: 15px;
    justify-content: center;
    margin-bottom: 20px;
}

.action-buttons .btn {
    padding: 12px 24px;
    font-size: 1em;
    border-radius: 6px;
}

/* Search Section */
.search-section {
    margin-bottom: 15px;
    padding: 0 20px;
}

.search-input {
    width: 100%;
    max-width: none;
    padding: 12px 16px;
    border: 2px solid var(--border-color);
    border-radius: 8px;
    font-size: 1em;
    transition: border-color 0.2s;
}

.search-input:focus {
    outline: none;
    border-color: var(--secondary-color);
    box-shadow: 0 0 0 3px rgba(52, 152, 219, 0.1);
}

/* List Section */
.list-section {
    background: var(--white);
    border-radius: 8px;
    padding: 20px;
    box-shadow: 0 2px 4px rgba(0,0,0,0.1);
}

/* Modal Styles */
.modal {
    display: none;
    position: fixed;
    z-index: 1000;
    left: 0;
    top: 0;
    width: 100%;
    height: 100%;
    background-color: rgba(0,0,0,0.5);
    animation: fadeIn 0.2s;
}

.modal.show {
    display: flex;
    justify-content: center;
    align-items: center;
}

.modal-content {
    background-color: var(--white);
    padding: 30px;
    border-radius: 8px;
    width: 90%;
    max-width: 500px;
    box-shadow: 0 4px 20px rgba(0,0,0,0.3);
    animation: slideIn 0.3s;
}

.modal-content.modal-large {
    max-width: 700px;
    max-height: 80vh;
    overflow-y: auto;
}

.close {
    color: var(--text-light);
    float: right;
    font-size: 28px;
    font-weight: bold;
    cursor: pointer;
    margin-top: -10px;
}

.close:hover {
    color: var(--text-dark);
}

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

.form-actions .btn {
    flex: 1;
}

/* History Styles */
.history-content {
    display: flex;
    flex-direction: column;
    gap: 15px;
    margin: 20px 0;
}

.history-item {
    border: 1px solid var(--border-color);
    border-radius: 6px;
    padding: 12px;
    background: #f8f9fa;
}

.history-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 10px;
    border-bottom: 1px solid var(--border-color);
    padding-bottom: 8px;
}

.history-variant {
    font-weight: 600;
    color: var(--primary-color);
}

.history-datetime {
    font-size: 0.9em;
    color: var(--text-light);
}

.history-details {
    display: flex;
    flex-direction: column;
    gap: 6px;
}

.history-row {
    display: flex;
    gap: 10px;
    font-size: 0.95em;
}

.history-label {
    font-weight: 600;
    color: var(--text-dark);
    min-width: 70px;
}

.history-value {
    color: var(--text-dark);
}

/* Responsive Design */
@media (max-width: 768px) {
    main {
        grid-template-columns: 1fr;
    }

    header h1 {
        font-size: 1.8em;
    }

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

    .filters {
        width: 100%;
    }

    .filter-btn {
        flex: 1;
    }

    .drug-details {
        grid-template-columns: 1fr;
    }

    .drug-actions {
        flex-wrap: wrap;
    }

    .modal-content {
        width: 95%;
    }
}

/* Variants Section */
.variants-list {
    display: grid;
    gap: 15px;
}

.variant-item {
    background: var(--white);
    border: 1px solid var(--border-color);
    border-radius: 8px;
    padding: 12px 16px;
    box-shadow: 0 2px 4px rgba(0,0,0,0.1);
    transition: transform 0.2s, box-shadow 0.2s;
}

.variant-item:hover {
    transform: translateY(-2px);
    box-shadow: 0 4px 8px rgba(0,0,0,0.15);
}

.variant-item.low-stock {
    border-left: 4px solid var(--danger-color);
}

.variant-info {
    display: flex;
    justify-content: space-between;
    align-items: flex-start;
    margin-bottom: 15px;
}

.variant-details {
    flex: 1;
}

.variant-name {
    font-size: 1.2em;
    font-weight: bold;
    color: var(--primary-color);
    margin-bottom: 5px;
}

.variant-strength {
    color: var(--text-light);
    margin-bottom: 5px;
}

.variant-quantity {
    font-size: 1.1em;
    font-weight: 500;
    color: var(--primary-color);
}

.variant-unit {
    color: var(--text-light);
}

.variant-status {
    text-align: right;
}

.variant-badge {
    display: inline-block;
    padding: 4px 8px;
    border-radius: 4px;
    font-size: 0.9em;
    font-weight: bold;
}

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

.badge-low {
    background-color: var(--danger-color);
    color: var(--white);
}

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

.btn-small {
    padding: 6px 12px;
    font-size: 0.9em;
}

@keyframes fadeIn {
    from {
        opacity: 0;
    }
    to {
        opacity: 1;
    }
}

@keyframes slideIn {
    from {
        transform: translateY(-50px);
        opacity: 0;
    }
    to {
        transform: translateY(0);
        opacity: 1;
    }
}

/* User Management Styles */
.user-management-content {
    margin: 20px 0;
}

.user-management-content h3 {
    margin-top: 20px;
    margin-bottom: 15px;
    color: var(--primary-color);
}

.user-management-content .form-row {
    display: flex;
    gap: 10px;
    margin-bottom: 15px;
}

.user-management-content input {
    flex: 1;
    padding: 10px;
    border: 1px solid var(--border-color);
    border-radius: 6px;
    font-size: 0.95em;
}

.user-management-content .btn {
    margin-bottom: 20px;
}

.users-list {
    margin-top: 20px;
}

.users-table {
    display: flex;
    flex-direction: column;
    gap: 10px;
}

.user-item {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 12px;
    background: #f8f9fa;
    border: 1px solid var(--border-color);
    border-radius: 6px;
    gap: 15px;
}

.admin-badge {
    padding: 4px 12px;
    background: var(--warning-color);
    color: var(--white);
    border-radius: 20px;
    font-size: 0.9em;
    font-weight: 500;
}

/* Responsive Styles */
@media (max-width: 768px) {
    header {
        padding: 20px 10px;
    }

    .header-top {
        flex-direction: column;
        gap: 15px;
        text-align: center;
    }

    .header-top h1 {
        flex: none;
        font-size: 1.8em;
    }

    .user-menu {
        justify-content: center;
    }

    .modal-content {
        width: 90%;
        max-width: none;
    }

    .drug-item {
        flex-direction: column;
    }

    .drug-actions {
        flex-wrap: wrap;
    }

    .variant-item {
        flex-direction: column;
    }

    .variant-actions {
        flex-direction: row;
        flex-wrap: wrap;
    }
}