/* --- CSS Reset & Global Styles --- */
:root {
    --bg-color: #1a1a1a;
    --surface-color: #2c2c2c;
    --primary-color: #007bff;
    --primary-hover-color: #0056b3;
    --secondary-color: #4f4f4f;
    --secondary-hover-color: #666;
    --text-color: #f0f0f0;
    --text-muted-color: #a0a0a0;
    --border-color: #444;
    --error-color: #dc3545;
    --font-family: 'Inter', sans-serif;
    --border-radius: 8px;
    --box-shadow: 0 4px 12px rgba(0, 0, 0, 0.2);
}

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

body {
    font-family: var(--font-family);
    background-color: var(--bg-color);
    color: var(--text-color);
    display: flex;
    justify-content: center;
    align-items: center;
    min-height: 100vh;
    padding: 1rem;
}

.hidden {
    display: none !important;
}

.container {
    width: 100%;
    max-width: 1200px;
}

/* --- Authentication Styles --- */
#auth-container {
    max-width: 400px;
    background-color: var(--surface-color);
    padding: 2rem;
    border-radius: var(--border-radius);
    box-shadow: var(--box-shadow);
}

#auth-container h2 {
    text-align: center;
    margin-bottom: 1.5rem;
    color: var(--text-color);
}

#auth-container p {
    text-align: center;
    margin-top: 1rem;
    color: var(--text-muted-color);
}

#auth-container a {
    color: var(--primary-color);
    text-decoration: none;
    font-weight: 500;
}

#auth-container a:hover {
    text-decoration: underline;
}

/* --- Form Styles --- */
form {
    display: flex;
    flex-direction: column;
    gap: 1rem;
}

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

.form-group label {
    margin-bottom: 0.5rem;
    font-weight: 500;
    color: var(--text-muted-color);
}

.form-group input,
.form-group textarea,
.form-group select {
    width: 100%;
    padding: 0.75rem;
    background-color: var(--bg-color);
    border: 1px solid var(--border-color);
    border-radius: var(--border-radius);
    color: var(--text-color);
    font-size: 1rem;
}

.form-group input:focus,
.form-group textarea:focus,
.form-group select:focus {
    outline: none;
    border-color: var(--primary-color);
    box-shadow: 0 0 0 2px rgba(0, 123, 255, 0.25);
}

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

/* --- Button Styles --- */
.btn {
    padding: 0.75rem 1.5rem;
    border: none;
    border-radius: var(--border-radius);
    cursor: pointer;
    font-size: 1rem;
    font-weight: 600;
    transition: background-color 0.2s ease, transform 0.1s ease;
}

.btn:active {
    transform: scale(0.98);
}

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

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

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

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

/* --- Main Application Layout --- */
.app-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 1rem 0;
    border-bottom: 1px solid var(--border-color);
    margin-bottom: 1.5rem;
}

.app-header nav {
    display: flex;
    align-items: center;
    gap: 1rem;
}

#welcome-user {
    font-weight: 500;
}

.app-main {
    display: grid;
    gap: 1.5rem;
}

.app-footer {
    text-align: center;
    margin-top: 2rem;
    padding-top: 1rem;
    border-top: 1px solid var(--border-color);
    color: var(--text-muted-color);
}

/* --- Card Styles --- */
.card {
    background-color: var(--surface-color);
    border-radius: var(--border-radius);
    padding: 1.5rem;
    box-shadow: var(--box-shadow);
}

.card-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 1.5rem;
}

.card-header h2 {
    margin: 0;
}

/* --- Project & Task List Styles --- */
#projects-list, #tasks-list {
    display: grid;
    gap: 1rem;
}

.project-item, .task-item {
    background-color: var(--bg-color);
    padding: 1rem;
    border-radius: var(--border-radius);
    border: 1px solid var(--border-color);
    cursor: pointer;
    transition: border-color 0.2s ease, transform 0.2s ease;
}

.project-item:hover, .task-item:hover {
    border-color: var(--primary-color);
    transform: translateY(-2px);
}

.project-item h3, .task-item h3 {
    margin-bottom: 0.5rem;
    color: var(--text-color);
}

.project-item p, .task-item p {
    color: var(--text-muted-color);
    font-size: 0.9rem;
}

.task-item .task-meta {
    display: flex;
    gap: 1rem;
    margin-top: 0.75rem;
    font-size: 0.8rem;
}

.task-item .task-meta span {
    background-color: var(--secondary-color);
    padding: 0.2rem 0.5rem;
    border-radius: 4px;
}

/* --- Modal Styles --- */
.modal-overlay {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background-color: rgba(0, 0, 0, 0.7);
    display: flex;
    justify-content: center;
    align-items: center;
    z-index: 1000;
}

.modal-content {
    background-color: var(--surface-color);
    padding: 2rem;
    border-radius: var(--border-radius);
    width: 90%;
    max-width: 600px;
    max-height: 90vh;
    overflow-y: auto;
    position: relative;
    box-shadow: 0 8px 24px rgba(0, 0, 0, 0.5);
}

.modal-close-btn {
    position: absolute;
    top: 1rem;
    right: 1rem;
    background: none;
    border: none;
    color: var(--text-muted-color);
    font-size: 1.5rem;
    cursor: pointer;
}

/* --- Task Details in Modal --- */
#task-details h2 {
    margin-bottom: 0.5rem;
}
#task-details p {
    margin-bottom: 1rem;
    color: var(--text-muted-color);
}
#task-details .details-section {
    margin-top: 1.5rem;
    border-top: 1px solid var(--border-color);
    padding-top: 1.5rem;
}

/* --- Responsive Design --- */
@media (min-width: 768px) {
    .app-main {
        grid-template-columns: 1fr 2fr;
    }

    #projects-list, #tasks-list {
        grid-template-columns: repeat(auto-fill, minmax(250px, 1fr));
    }

    #tasks-section.full-width {
        grid-column: 1 / -1;
    }
}