/* --- Material You (Android 16) Inspired Design --- */
:root {
    --m3-primary: #0061A4;
    --m3-on-primary: #FFFFFF;
    --m3-primary-container: #D2E4FF;
    --m3-on-primary-container: #001D36;
    --m3-secondary: #535F70;
    --m3-on-secondary: #FFFFFF;
    --m3-secondary-container: #D7E3F8;
    --m3-on-secondary-container: #101C2B;
    --m3-background: #F8F9FF;
    --m3-on-background: #1A1C1E;
    --m3-surface: #F8F9FF;
    --m3-on-surface: #1A1C1E;
    --m3-surface-variant: #DFE2EB;
    --m3-on-surface-variant: #43474E;
    --m3-outline: #73777F;
    --m3-shadow: #000000;
    --m3-error: #BA1A1A;
    --m3-error-container: #FFDAD6;
    --m3-on-error-container: #410002;
    --m3-success: #006E10;
    --m3-success-container: #9EF68E;
    --m3-on-success-container: #002202;

    --m3-border-radius-lg: 16px;
    --m3-border-radius-md: 12px;
    --m3-border-radius-sm: 8px;
}

/* --- Base & Typography --- */
body {
    font-family: 'Inter', -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "Helvetica Neue", Arial, sans-serif;
    background-color: var(--m3-background);
    color: var(--m3-on-background);
    margin: 0;
    padding: 0;
    line-height: 1.5;
}

/* --- App Bar --- */
.app-bar {
    background-color: var(--m3-surface);
    border-bottom: 1px solid var(--m3-surface-variant);
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 12px 24px;
    position: sticky;
    top: 0;
    z-index: 10;
}

.app-bar-brand {
    font-size: 1.25rem;
    font-weight: 600;
    color: var(--m3-on-surface);
    text-decoration: none;
}

.app-bar-toggle {
    display: none;
    background: none;
    border: none;
    cursor: pointer;
    padding: 8px;
}

.app-bar-toggle svg {
    width: 28px;
    height: 28px;
    fill: var(--m3-on-surface-variant);
}

.app-bar-collapse {
    display: flex;
    align-items: center;
    gap: 16px;
}

.app-bar-nav {
    display: flex;
    align-items: center;
    gap: 16px;
}

.app-bar-nav a, .app-bar-nav span {
    text-decoration: none;
    color: var(--m3-on-surface-variant);
    font-size: 0.9rem;
    font-weight: 500;
    padding: 8px 12px;
    border-radius: var(--m3-border-radius-md);
    transition: background-color 0.2s ease-in-out;
}

.app-bar-nav a.active {
    background-color: var(--m3-primary-container);
    color: var(--m3-on-primary-container);
    font-weight: 600;
}

.app-bar-nav a:not(.active):hover {
    background-color: rgba(0, 0, 0, 0.05);
}

.app-bar-user {
    display: flex;
    align-items: center;
    gap: 16px;
    border-left: 1px solid var(--m3-surface-variant);
    margin-left: 16px;
    padding-left: 16px;
}

.app-bar-user .user-name {
    font-size: 0.9rem;
    font-weight: 500;
    color: var(--m3-on-surface-variant);
}

.app-bar-user .logout-link {
    font-size: 0.9rem;
    font-weight: 500;
    color: var(--m3-error);
    text-decoration: none;
    padding: 8px 12px;
    border-radius: var(--m3-border-radius-md);
    transition: background-color 0.2s ease-in-out;
}

.app-bar-user .logout-link:hover {
    background-color: var(--m3-error-container);
}

/* --- Main Content & Card --- */
.main-container {
    max-width: 1100px;
    margin: 32px auto;
    padding: 0 24px;
}

.page-title {
    font-size: 2rem;
    font-weight: 700;
    color: var(--m3-on-background);
    margin-bottom: 24px;
}

.card {
    background-color: var(--m3-surface);
    border-radius: var(--m3-border-radius-lg);
    border: 1px solid var(--m3-surface-variant);
    padding: 28px;
    margin-bottom: 24px;
    box-shadow: 0 1px 3px rgba(var(--m3-shadow), 0.1);
    overflow-x: auto; /* For tables on mobile */
}

.card-title {
    font-size: 1.5rem;
    font-weight: 600;
    color: var(--m3-on-surface);
    margin-top: 0;
    margin-bottom: 24px;
}

/* --- Form Elements --- */
.form-field {
    margin-bottom: 20px;
}

.form-label {
    display: block;
    margin-bottom: 8px;
    font-size: 0.9rem;
    font-weight: 500;
    color: var(--m3-on-surface-variant);
}

.form-select, .form-input {
    width: 100%;
    box-sizing: border-box; /* Fixes padding issues */
    padding: 14px 16px;
    font-size: 1rem;
    font-family: 'Inter', sans-serif;
    border: 1px solid var(--m3-outline);
    border-radius: var(--m3-border-radius-sm);
    background-color: var(--m3-surface);
    color: var(--m3-on-surface);
    transition: border-color 0.2s ease, box-shadow 0.2s ease;
    -webkit-appearance: none;
    -moz-appearance: none;
    appearance: none;
}

.form-select {
    background-image: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' viewBox='0 0 24 24' fill='%2343474E'%3E%3Cpath d='M7 10l5 5 5-5H7z'/%3E%3C/svg%3E");
    background-repeat: no-repeat;
    background-position: right 16px center;
    background-size: 24px;
    padding-right: 48px;
}

.form-select:focus, .form-input:focus {
    border-color: var(--m3-primary);
    box-shadow: 0 0 0 2px var(--m3-primary-container);
    outline: none;
}

.form-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(250px, 1fr));
    gap: 20px;
}


/* Custom File Input */
.file-input-wrapper {
    position: relative;
    display: flex;
    align-items: center;
    gap: 12px;
}

.file-input-hidden {
    position: absolute;
    width: 1px;
    height: 1px;
    opacity: 0;
    overflow: hidden;
    z-index: -1;
}

.file-input-button {
    display: inline-block;
    background-color: var(--m3-secondary-container);
    color: var(--m3-on-secondary-container);
    font-weight: 500;
    padding: 14px 24px;
    border-radius: var(--m3-border-radius-md);
    cursor: pointer;
    transition: background-color 0.2s ease;
}

.file-input-button:hover {
    filter: brightness(95%);
}

.file-input-label {
    font-size: 0.95rem;
    color: var(--m3-on-surface-variant);
    white-space: nowrap;
    overflow: hidden;
    text-overflow: ellipsis;
}

/* --- Buttons --- */
.btn {
    font-family: 'Inter', sans-serif;
    font-size: 0.95rem;
    font-weight: 600;
    padding: 14px 28px;
    border: none;
    border-radius: var(--m3-border-radius-md);
    cursor: pointer;
    transition: background-color 0.2s ease, box-shadow 0.2s ease;
    text-decoration: none;
}

.btn-primary {
    background-color: var(--m3-primary);
    color: var(--m3-on-primary);
    box-shadow: 0 1px 3px rgba(var(--m3-shadow), 0.1);
}

.btn-primary:hover {
    filter: brightness(90%);
    box-shadow: 0 2px 6px rgba(var(--m3-shadow), 0.15);
}

.btn-success {
    background-color: var(--m3-success);
    color: var(--m3-on-primary);
    box-shadow: 0 1px 3px rgba(var(--m3-shadow), 0.1);
}

.btn-success:hover {
    filter: brightness(90%);
    box-shadow: 0 2px 6px rgba(var(--m3-shadow), 0.15);
}

.btn-danger {
    background-color: var(--m3-error);
    color: var(--m3-on-primary);
    box-shadow: 0 1px 3px rgba(var(--m3-shadow), 0.1);
}

.btn-danger:hover {
    filter: brightness(90%);
    box-shadow: 0 2px 6px rgba(var(--m3-shadow), 0.15);
}

.btn-secondary {
    background-color: var(--m3-secondary-container);
    color: var(--m3-on-secondary-container);
}
.btn-secondary:hover {
    filter: brightness(95%);
}


.btn:disabled {
    background-color: var(--m3-surface-variant);
    color: var(--m3-on-surface-variant);
    opacity: 0.7;
    cursor: not-allowed;
    box-shadow: none;
}

/* --- Table --- */
.data-table {
    width: 100%;
    border-collapse: collapse;
    margin-top: 24px;
}

.data-table th, .data-table td {
    padding: 14px 16px;
    text-align: left;
    border-bottom: 1px solid var(--m3-surface-variant);
    white-space: nowrap;
}

.data-table th {
    font-size: 0.9rem;
    font-weight: 600;
    color: var(--m3-on-surface-variant);
    background-color: var(--m3-surface);
}

.data-table td {
    font-size: 0.95rem;
    color: var(--m3-on-surface);
}

.data-table tr:hover {
    background-color: rgba(0, 0, 0, 0.02);
}


/* --- Message Area --- */
#message {
    padding: 16px;
    border-radius: var(--m3-border-radius-md);
    font-weight: 500;
    display: none;
    margin-top: 24px;
}

#message.success {
    display: block;
    background-color: var(--m3-success-container);
    color: var(--m3-on-success-container);
    border: 1px solid var(--m3-success);
}

#message.error {
    display: block;
    background-color: var(--m3-error-container);
    color: var(--m3-on-error-container);
    border: 1px solid var(--m3-error);
}

/* --- Loader --- */
#loader-overlay {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background-color: rgba(0, 0, 0, 0.4);
    display: none;
    justify-content: center;
    align-items: center;
    z-index: 9998;
    backdrop-filter: blur(4px);
}

.loader {
    width: 60px;
    height: 60px;
    border-radius: 50%;
    border: 6px solid var(--m3-primary-container);
    border-top-color: var(--m3-primary);
    animation: spin 1s linear infinite;
    z-index: 9999;
}

/* --- Modal --- */
.modal-overlay {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background-color: rgba(0, 0, 0, 0.6);
    display: none;
    justify-content: center;
    align-items: center;
    z-index: 1000;
    backdrop-filter: blur(4px);
}

.modal-dialog {
    background-color: var(--m3-surface);
    border-radius: var(--m3-border-radius-lg);
    padding: 28px;
    max-width: 400px;
    width: 90%;
    box-shadow: 0 4px 12px rgba(var(--m3-shadow), 0.2);
}

.modal-title {
    font-size: 1.5rem;
    font-weight: 600;
    color: var(--m3-on-surface);
    margin-top: 0;
    margin-bottom: 16px;
}

.modal-body {
    font-size: 1rem;
    color: var(--m3-on-surface-variant);
    margin-bottom: 24px;
}

.modal-footer {
    display: flex;
    justify-content: flex-end;
    gap: 12px;
}


@keyframes spin {
    to {
        transform: rotate(360deg);
    }
}

/* --- Responsive (Mobile) --- */
@media (max-width: 992px) {
    .app-bar-toggle {
        display: block;
    }
    .app-bar-collapse {
        display: none;
        position: absolute;
        top: 68px; /* App bar height */
        left: 0;
        width: 100%;
        background-color: var(--m3-surface);
        box-shadow: 0 4px 8px rgba(var(--m3-shadow), 0.1);
        flex-direction: column;
        align-items: flex-start;
        padding: 16px;
        gap: 0;
    }
    .app-bar-collapse.active {
        display: flex;
    }
    .app-bar-nav {
        flex-direction: column;
        align-items: flex-start;
        width: 100%;
    }
    .app-bar-nav a {
        padding: 12px;
        width: 100%;
    }
    .app-bar-user {
        flex-direction: column;
        align-items: flex-start;
        border: none;
        margin: 0;
        padding: 0;
        margin-top: 16px;
        padding-top: 16px;
        border-top: 1px solid var(--m3-surface-variant);
        width: 100%;
    }
    .app-bar-user .user-name {
        padding: 8px 12px;
    }
}