/* Global styles using CSS Variables for consistency */
:root {
    --bg-gradient-start: #0f2027;
    --bg-gradient-mid: #203a43;
    --bg-gradient-end: #2c5364;
    --primary-accent: #00c6ff;
    --primary-accent-hover: #00e0ff;
    --text-primary: #ffffff;
    --text-secondary: #e0f0ff;
    --text-muted: #b0c0d0;
    --border-color: rgba(255, 255, 255, 0.2);
    --input-bg: rgba(255, 255, 255, 0.1);
    --container-bg: rgba(255, 255, 255, 0.05);
    --header-bg: rgba(255, 255, 255, 0.08);
    --danger-color: #ff6347;
    --danger-color-hover: #e5533d;
    --success-color: #28a745;
    --warning-color: #dc3545;
    --warning-alt-color: #ff9f43; /* Color for frontend duplicates */
    --neutral-color: #6c757d;
    --neutral-color-hover: #5a6268;
    --font-family: 'Poppins', sans-serif;
    --border-radius: 8px;
}

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

body {
    font-family: var(--font-family);
    background: linear-gradient(135deg, var(--bg-gradient-start), var(--bg-gradient-mid), var(--bg-gradient-end));
    color: var(--text-primary);
    line-height: 1.6;
    min-height: 100vh;
    display: flex;
    flex-direction: column;
}

.container {
    max-width: 1200px;
    margin: 20px auto;
    padding: 30px;
    background: var(--container-bg);
    border-radius: 15px;
    box-shadow: 0 0 20px rgba(0, 255, 255, 0.15);
    text-align: center;
    flex-grow: 1;
}

h1 {
    color: var(--primary-accent);
    margin-bottom: 20px;
    text-shadow: 0 0 10px rgba(0, 198, 255, 0.4);
}

/* Header and Top Bar Styles */
header {
    background: var(--header-bg);
    border-bottom: 1px solid var(--border-color);
    padding: 15px 25px;
    display: flex;
    justify-content: space-between;
    align-items: center;
    box-shadow: 0 2px 10px rgba(0, 255, 255, 0.08);
    flex-wrap: wrap;
    gap: 15px;
}

.topbar {
    display: flex;
    align-items: center;
    flex-shrink: 0;
}

.topbar img {
    height: 50px;
    margin-right: 15px;
    border-radius: 50%;
    box-shadow: 0 0 8px rgba(0, 255, 255, 0.5);
    object-fit: contain;
}

.topbar span {
    font-size: 1.2em;
    font-weight: 600;
    color: var(--primary-accent);
    white-space: nowrap;
}

.header-center-nav {
    flex-grow: 1;
    display: flex;
    justify-content: center;
    align-items: center;
    padding: 0 15px;
    min-width: 80px;
}

.home-button {
    color: var(--primary-accent);
    font-size: 1.1em;
    text-decoration: none;
    display: flex;
    align-items: center;
    gap: 8px;
    transition: color 0.2s ease, transform 0.2s ease, box-shadow 0.2s ease, background-color 0.2s ease;
    padding: 8px 15px;
    border-radius: var(--border-radius);
    background: rgba(255, 255, 255, 0.1);
    box-shadow: 0 2px 5px rgba(0, 255, 255, 0.2);
}

.home-button:hover {
    color: var(--primary-accent-hover);
    transform: translateY(-2px);
    box-shadow: 0 4px 10px rgba(0, 255, 255, 0.4);
    background: rgba(255, 255, 255, 0.15);
}

.home-button .fas {
    font-size: 1.5em;
}

.header-right {
    display: flex;
    align-items: center;
    gap: 15px;
    flex-shrink: 0;
}

.datetime {
    font-size: 0.9em;
    color: var(--text-muted);
    font-weight: 500;
    white-space: normal;
    line-height: 1.3;
    text-align: left;
}

a.logout {
    background-color: var(--danger-color);
    color: var(--text-primary);
    padding: 12px 20px;
    border-radius: var(--border-radius);
    text-decoration: none;
    font-weight: bold;
    font-size: 1.1em;
    transition: background-color 0.3s ease, transform 0.2s ease, box-shadow 0.3s ease;
    box-shadow: 0 2px 8px rgba(255, 99, 71, 0.3);
}

a.logout:hover {
    background-color: var(--danger-color-hover);
    transform: translateY(-1px);
    box-shadow: 0 4px 12px rgba(255, 99, 71, 0.5);
}

/* Form Specific Styles */
form {
    text-align: left;
    margin-top: 20px;
}

fieldset {
    border: 1px solid var(--border-color);
    border-radius: 10px;
    padding: 25px;
    margin-bottom: 30px;
    background: rgba(255, 255, 255, 0.03);
    margin-top: 20px;
}

legend {
    color: var(--primary-accent-hover);
    font-size: 1.2em;
    font-weight: 700;
    padding: 0 10px;
    margin-left: 10px;
    background: var(--bg-gradient-mid);
    border-radius: var(--border-radius);
}

.form-grid {
    display: grid;
    grid-template-columns: 1fr;
    gap: 20px;
}

@media (min-width: 768px) {
    .form-grid {
        grid-template-columns: 1fr 1fr;
    }
}

.input-group {
    display: flex;
    flex-direction: column;
}

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

.input-with-icon {
    position: relative;
}

.input-with-icon .icon {
    position: absolute;
    left: 15px;
    top: 50%;
    transform: translateY(-50%);
    color: var(--text-muted);
    font-size: 1.1em;
    pointer-events: none;
}

input[type="text"],
input[type="date"],
input[type="time"],
textarea,
button {
    font-family: inherit;
    width: 100%;
    padding: 12px 15px 12px 45px;
    background: var(--input-bg);
    border: 1px solid var(--border-color);
    border-radius: var(--border-radius);
    color: var(--text-primary);
    font-size: 1rem;
    transition: border-color 0.3s ease, box-shadow 0.3s ease;
}

button {
    width: auto;
    padding: 12px 25px;
}


input:focus,
textarea:focus {
    border-color: var(--primary-accent);
    box-shadow: 0 0 10px rgba(0, 198, 255, 0.3);
    outline: none;
}

input[readonly] {
    background: rgba(0, 0, 0, 0.2);
    cursor: not-allowed;
    color: var(--text-muted);
}

textarea {
    resize: vertical;
    min-height: 80px;
}

.input-info-text {
    font-size: 0.85em;
    color: var(--text-muted);
    margin-top: 5px;
    text-align: left;
}

/* NEW: Styles for the in-form submission error */
.form-submission-error {
    display: none; /* Hidden by default */
    text-align: center;
    color: var(--warning-color);
    background-color: rgba(220, 53, 69, 0.1);
    border: 1px solid var(--warning-color);
    padding: 10px;
    border-radius: var(--border-radius);
    margin-bottom: 20px;
    font-weight: 500;
}

.buttons {
    display: flex;
    justify-content: center;
    gap: 20px;
    margin-top: 30px;
    flex-wrap: wrap;
}

.buttons button {
    border: none;
    font-weight: 600;
    cursor: pointer;
    transition: all 0.2s ease;
    display: inline-flex;
    align-items: center;
    gap: 8px;
}

button[type="submit"] {
    background: linear-gradient(90deg, var(--primary-accent), #0072ff);
    color: var(--text-primary);
    box-shadow: 0 4px 15px rgba(0, 198, 255, 0.4);
}

button[type="submit"]:hover {
    transform: translateY(-2px);
    box-shadow: 0 6px 20px rgba(0, 198, 255, 0.6);
}

/* NEW: Style for disabled submit button */
button[type="submit"]:disabled {
    background: var(--neutral-color);
    box-shadow: none;
    cursor: not-allowed;
    transform: none;
    opacity: 0.6;
}

button#clearBtn {
    background: var(--neutral-color);
    color: var(--text-primary);
    box-shadow: 0 4px 15px rgba(108, 117, 125, 0.4);
}

button#clearBtn:hover {
    background: var(--neutral-color-hover);
    transform: translateY(-2px);
    box-shadow: 0 6px 20px rgba(108, 117, 125, 0.6);
}

/* --- Multi-User Form Styles --- */
.employee-entry {
    display: flex;
    align-items: center;
    gap: 10px;
    margin-bottom: 15px;
}

.employee-grid {
    flex-grow: 1;
    display: grid;
    grid-template-columns: 1fr 2fr 1fr;
    gap: 15px;
}

.employee-entry .input-group {
    margin-bottom: 0;
}

.employee-entry:not(:first-child) .input-group label {
    display: none;
}

.loading-spinner {
    display: none;
    position: absolute;
    top: 50%;
    right: 15px;
    transform: translateY(-50%);
    color: var(--primary-accent);
}

.emp-error {
    display: none;
    font-size: 0.8em;
    margin-top: 4px;
    text-align: left;
    padding-left: 5px;
}
.emp-error.invalid-error { color: #ff6b6b; }
.emp-error.duplicate-error { color: var(--warning-alt-color); }
.emp-error.db-duplicate-error { color: var(--warning-color); } /* NEW */


.remove-employee {
    background: none;
    border: none;
    color: #ff6b6b;
    font-size: 1.2em;
    cursor: pointer;
    padding: 10px;
    transition: color 0.2s ease, transform 0.2s ease;
    width: 44px;
    text-align: center;
}

.remove-employee:hover {
    color: #ff4757;
    transform: scale(1.1);
}

.add-employee-btn {
    background: rgba(0, 198, 255, 0.2);
    border: 1px solid var(--primary-accent);
    color: var(--primary-accent);
    padding: 10px 20px;
    border-radius: var(--border-radius);
    cursor: pointer;
    font-weight: 600;
    transition: all 0.2s ease;
    display: inline-flex;
    align-items: center;
    gap: 8px;
    margin-top: 10px;
}

.add-employee-btn:hover {
    background: var(--primary-accent);
    color: var(--bg-gradient-start);
}

/* Toast Notification for JS actions */
.message {
    padding: 15px;
    margin-bottom: 20px;
    border-radius: var(--border-radius);
    font-weight: 500;
    text-align: center;
}

.message.success { background-color: var(--success-color); color: var(--text-primary); }
.message.error { background-color: var(--warning-color); color: var(--text-primary); }

.toast-popup {
    position: fixed;
    bottom: 30px;
    right: 30px;
    z-index: 9999;
    min-width: 300px;
    box-shadow: 0 5px 15px rgba(0, 0, 0, 0.3);
    opacity: 0;
    transform: translateX(100%);
    transition: opacity 0.4s ease, transform 0.4s ease;
    pointer-events: none;
}

.toast-popup.show {
    opacity: 1;
    transform: translateX(0);
    pointer-events: auto;
}

/* --- Custom Tree Dropdown --- */
.custom-tree-dropdown {
    position: relative;
    width: 100%;
    background: var(--input-bg);
    border: 1px solid var(--border-color);
    border-radius: var(--border-radius);
    color: var(--text-primary);
    font-size: 1rem;
}

.custom-tree-dropdown .icon {
    position: absolute;
    left: 15px;
    top: 50%;
    transform: translateY(-50%);
    color: var(--text-muted);
}

.dropdown-selected-text {
    padding: 12px 15px 12px 45px;
    cursor: pointer;
    user-select: none;
    position: relative;
}

.dropdown-selected-text::after {
    content: '\f078';
    font-family: 'Font Awesome 6 Free';
    font-weight: 900;
    position: absolute;
    right: 15px;
    top: 50%;
    transform: translateY(-50%);
    transition: transform 0.2s ease;
}

.custom-tree-dropdown.open .dropdown-selected-text::after {
    transform: translateY(-50%) rotate(180deg);
}

.dropdown-options-container {
    display: none;
    position: absolute;
    top: 110%;
    left: 0;
    width: 100%;
    max-height: 250px;
    overflow-y: auto;
    background: var(--bg-gradient-mid);
    border: 1px solid var(--border-color);
    border-radius: var(--border-radius);
    z-index: 1050;
    box-shadow: 0 8px 16px rgba(0,0,0,0.3);
}

.custom-tree-dropdown.open .dropdown-options-container {
    display: block;
}

.dropdown-options-list,
.dropdown-options-list ul {
    list-style: none;
    padding: 0;
    margin: 0;
}

.dropdown-options-list li {
    padding: 10px 15px;
    transition: background-color 0.2s ease;
    text-align: left;
}

.dropdown-options-list li.has-children {
    color: var(--text-primary);
    cursor: pointer;
}

.dropdown-options-list li.is-selectable {
    cursor: pointer;
    padding-left: 30px;
}

.dropdown-options-list li.is-selectable:hover {
    background-color: var(--bg-gradient-end);
}

.dropdown-options-list ul {
    border-left: 1px solid var(--border-color);
    margin-left: 10px;
    padding-left: 10px;
}

.custom-tree-dropdown .dropdown-options-list li ul {
    display: none;
}

.dropdown-options-list li.expanded > ul {
    display: block;
}

.dropdown-options-list li.has-children > .item-text::before {
    content: '\f0da';
    font-family: 'Font Awesome 6 Free';
    font-weight: 900;
    margin-right: 8px;
    transition: transform 0.2s ease;
    display: inline-block;
}

.dropdown-options-list li.has-children.expanded > .item-text::before {
    transform: rotate(90deg);
}

/* --- Navigation Buttons --- */
.nav-button {
    display: inline-block;
    background: linear-gradient(135deg, var(--neutral-color), var(--neutral-color-hover));
    color: var(--text-primary);
    padding: 12px 25px;
    border-radius: var(--border-radius);
    text-decoration: none;
    font-weight: 600;
    margin-top: 20px;
    transition: all 0.3s ease;
    box-shadow: 0 4px 6px rgba(0,0,0,0.1);
    border: 1px solid rgba(255,255,255,0.1);
}

.nav-button:hover {
    transform: translateY(-2px);
    box-shadow: 0 6px 12px rgba(0,0,0,0.2);
    background: linear-gradient(135deg, var(--neutral-color-hover), var(--neutral-color));
    color: var(--text-primary);
}