/* ========================================
   Research Form - University of Ngaoundere
   ======================================== */

/* --- Reset & Base --- */

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

html {
    font-size: 16px;
    scroll-behavior: smooth;
}

body {
    font-family: "Segoe UI", Roboto, "Helvetica Neue", Arial, sans-serif;
    background-color: #f5f7fa;
    color: #2c3e50;
    line-height: 1.6;
    min-height: 100vh;
}

/* --- Container --- */

.container {
    max-width: 800px;
    margin: 0 auto;
    padding: 20px 16px 40px;
}

/* --- Header --- */

.form-header {
    background-color: #1a5632;
    color: #ffffff;
    padding: 24px 28px;
    border-radius: 8px 8px 0 0;
    text-align: center;
}

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

.logo-placeholder {
    width: 80px;
    height: 80px;
    display: flex;
    align-items: center;
    justify-content: center;
}

.logo-placeholder img {
    max-width: 100%;
    max-height: 100%;
    object-fit: contain;
}

.form-header h1 {
    font-size: 1.5rem;
    font-weight: 700;
    letter-spacing: 1px;
    margin-bottom: 8px;
}

.form-header .subtitle {
    font-size: 0.95rem;
    font-weight: 400;
    opacity: 0.9;
}

/* --- Language switcher --- */

.lang-switcher {
    display: flex;
    gap: 4px;
}

.lang-btn {
    padding: 6px 14px;
    border: 2px solid rgba(255, 255, 255, 0.5);
    background: transparent;
    color: #ffffff;
    font-size: 0.85rem;
    font-weight: 600;
    border-radius: 4px;
    cursor: pointer;
    transition: all 0.2s ease;
}

.lang-btn:hover {
    background-color: rgba(255, 255, 255, 0.15);
}

.lang-btn.active {
    background-color: #ffffff;
    color: #1a5632;
    border-color: #ffffff;
}

/* --- Intro section --- */

.intro-section {
    background-color: #ffffff;
    padding: 24px 28px;
    border-left: 4px solid #1a5632;
}

.intro-section h2 {
    font-size: 1.2rem;
    color: #1a5632;
    margin-bottom: 12px;
}

.intro-section p {
    margin-bottom: 8px;
    font-size: 0.95rem;
}

.duration {
    font-size: 0.9rem;
    color: #666;
    margin-top: 8px;
}

/* --- Scale legend --- */

.scale-legend {
    background-color: #eef3e8;
    padding: 16px 28px;
    border-left: 4px solid #1a5632;
}

.scale-legend p {
    font-size: 0.95rem;
    margin-bottom: 10px;
}

.scale-items {
    display: flex;
    flex-direction: column;
    gap: 4px;
    font-size: 0.9rem;
}

.scale-items span {
    padding: 2px 0;
}

/* --- Form sections --- */

.form-section {
    background-color: #ffffff;
    margin-top: 16px;
    padding: 24px 28px;
    border-radius: 6px;
    box-shadow: 0 1px 3px rgba(0, 0, 0, 0.08);
}

.form-section h2 {
    font-size: 1.15rem;
    color: #1a5632;
    border-bottom: 2px solid #eee;
    padding-bottom: 10px;
    margin-bottom: 16px;
}

.form-section h3 {
    font-size: 1rem;
    color: #2c6e3f;
    margin-top: 20px;
    margin-bottom: 12px;
}

.section-subtitle {
    font-size: 0.85rem;
    color: #888;
    font-style: italic;
    margin-top: -10px;
    margin-bottom: 16px;
}

/* --- Radio groups (Section A) --- */

fieldset {
    border: none;
    margin-bottom: 20px;
}

fieldset legend {
    font-weight: 600;
    font-size: 0.95rem;
    margin-bottom: 10px;
    color: #333;
}

.radio-group {
    display: flex;
    flex-wrap: wrap;
    gap: 12px;
}

.radio-group-vertical {
    flex-direction: column;
    gap: 8px;
}

.radio-group label {
    display: flex;
    align-items: center;
    gap: 8px;
    padding: 8px 14px;
    border: 1px solid #ddd;
    border-radius: 6px;
    cursor: pointer;
    font-size: 0.9rem;
    transition: all 0.2s ease;
}

.radio-group label:hover {
    background-color: #f0f7f0;
    border-color: #1a5632;
}

.radio-group input[type="radio"] {
    accent-color: #1a5632;
    width: 16px;
    height: 16px;
}

.radio-group input[type="radio"]:checked + span {
    font-weight: 600;
    color: #1a5632;
}

/* --- Likert tables --- */

.likert-table table {
    width: 100%;
    border-collapse: collapse;
}

.likert-table thead th {
    padding: 10px 8px;
    font-size: 0.85rem;
    font-weight: 600;
    color: #666;
    text-align: center;
    border-bottom: 2px solid #1a5632;
}

.likert-table thead th:first-child {
    text-align: left;
    width: 55%;
}

.likert-table tbody tr {
    border-bottom: 1px solid #eee;
    transition: background-color 0.15s ease;
}

.likert-table tbody tr:hover {
    background-color: #f8faf5;
}

.likert-table tbody tr.has-error {
    background-color: #fef2f2;
}

.likert-table tbody td {
    padding: 12px 8px;
    text-align: center;
    vertical-align: middle;
}

.likert-table tbody td:first-child {
    text-align: left;
    font-size: 0.9rem;
    line-height: 1.4;
}

.likert-table tbody td .item-code {
    display: inline-block;
    font-weight: 700;
    color: #1a5632;
    min-width: 32px;
    margin-right: 6px;
    font-size: 0.8rem;
}

.likert-table input[type="radio"] {
    accent-color: #1a5632;
    width: 18px;
    height: 18px;
    cursor: pointer;
}

/* --- Textarea (comment) --- */

.form-section label[for="comment"] {
    display: block;
    font-size: 0.95rem;
    margin-bottom: 10px;
    color: #555;
}

textarea {
    width: 100%;
    padding: 12px;
    border: 1px solid #ddd;
    border-radius: 6px;
    font-family: inherit;
    font-size: 0.95rem;
    resize: vertical;
    transition: border-color 0.2s ease;
}

textarea:focus {
    outline: none;
    border-color: #1a5632;
    box-shadow: 0 0 0 3px rgba(26, 86, 50, 0.1);
}

/* --- Error messages --- */

.error-msg {
    display: none;
    color: #dc3545;
    font-size: 0.8rem;
    margin-top: 6px;
}

.error-msg.visible {
    display: block;
}

/* --- Submit button --- */

.form-actions {
    margin-top: 24px;
    text-align: center;
}

#submit-btn {
    background-color: #1a5632;
    color: #ffffff;
    border: none;
    padding: 14px 48px;
    font-size: 1rem;
    font-weight: 600;
    border-radius: 6px;
    cursor: pointer;
    transition: all 0.2s ease;
    letter-spacing: 0.5px;
}

#submit-btn:hover {
    background-color: #145028;
    transform: translateY(-1px);
    box-shadow: 0 4px 12px rgba(26, 86, 50, 0.3);
}

#submit-btn:active {
    transform: translateY(0);
}

#submit-btn:disabled {
    background-color: #94b8a0;
    cursor: not-allowed;
    transform: none;
    box-shadow: none;
}

/* --- Success / Error messages --- */

.message {
    margin-top: 24px;
    padding: 20px 28px;
    border-radius: 6px;
    text-align: center;
    font-size: 1rem;
}

.message.success {
    background-color: #d4edda;
    color: #155724;
    border: 1px solid #c3e6cb;
}

.message.error {
    background-color: #f8d7da;
    color: #721c24;
    border: 1px solid #f5c6cb;
}

.hidden {
    display: none;
}

/* --- Progress indicator --- */

.progress-bar {
    position: fixed;
    top: 0;
    left: 0;
    height: 4px;
    background-color: #1a5632;
    transition: width 0.3s ease;
    z-index: 1000;
}

/* ========================================
   Responsive
   ======================================== */

@media (max-width: 768px) {
    .container {
        padding: 12px 8px 32px;
    }

    .form-header {
        padding: 16px;
    }

    .form-header h1 {
        font-size: 1.2rem;
    }

    .header-top {
        flex-direction: column;
        gap: 12px;
    }

    .logo-placeholder {
        width: 60px;
        height: 60px;
    }

    .intro-section,
    .scale-legend,
    .form-section {
        padding: 16px;
    }

    /* Likert: switch to card layout on mobile */
    .likert-table table,
    .likert-table thead,
    .likert-table tbody,
    .likert-table th,
    .likert-table td,
    .likert-table tr {
        display: block;
    }

    .likert-table thead {
        display: none;
    }

    .likert-table tbody tr {
        padding: 12px 0;
        border-bottom: 1px solid #eee;
    }

    .likert-table tbody td:first-child {
        font-weight: 500;
        margin-bottom: 8px;
        padding: 0;
    }

    .likert-table tbody td {
        display: inline-flex;
        align-items: center;
        gap: 4px;
        padding: 4px 8px;
        font-size: 0.85rem;
    }

    .likert-table tbody td::before {
        content: attr(data-label);
        font-size: 0.75rem;
        color: #888;
    }

    .radio-group label {
        padding: 6px 10px;
        font-size: 0.85rem;
    }

    #submit-btn {
        width: 100%;
        padding: 14px;
    }
}

@media (max-width: 480px) {
    .form-header h1 {
        font-size: 1rem;
    }

    .form-header .subtitle {
        font-size: 0.85rem;
    }

    .form-section h2 {
        font-size: 1rem;
    }
}