html {
    box-sizing: border-box;
}

*, *::before, *::after {
    box-sizing: inherit;
}

body {
    font-family: Arial, sans-serif;
    background-color: whitesmoke;
    margin: 0;
    padding: 0 1rem 1rem 1rem;
}

header {
    position: relative;
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: 1rem 2rem;
    background-color: #3168ff;
    color: white;
    box-shadow: 0 2px 4px rgba(0,0,0,0.1);
}

.hamburger-menu {
    display: flex;
    flex-direction: column;
    cursor: pointer;
    padding: 0.5rem;
}

.hamburger-menu span {
    width: 25px;
    height: 3px;
    background-color: white;
    margin: 3px 0;
    transition: 0.3s;
}

header h1 {
    margin: 0;
    font-size: 2rem;
    flex-grow: 1;
    text-align: center;
}

.dropdown-menu {
    position: absolute;
    top: calc(100% + 0.5rem);
    left: 1rem;
    background-color: white;
    border: 1px solid #ddd;
    border-radius: 0 0 8px 8px;
    box-shadow: 0 2px 8px rgba(0,0,0,0.1);
    z-index: 1000;
    min-width: 220px;
    overflow: hidden;
}

.dropdown-menu a {
    display: block;
    padding: 1rem;
    color: #333;
    text-decoration: none;
    border-bottom: 1px solid #eee;
}

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

.dropdown-menu a:hover {
    background-color: #f8f8f8;
}

.return-button {
    margin-bottom: 20px;
}

.return-button a {
    display: inline-block;
    padding: 0.8rem 1.25rem;
    border: none;
    border-radius: 10px;
    font-size: 1rem;
    background-color: #3168ff;
    color: white;
    text-decoration: none;
    transition: background-color 0.2s ease;
    cursor: pointer;
}

.return-button a:hover,
.login-inputs button:hover {
    background-color: #1f4ed8;
}

.dropdown-menu a:hover,
.dropdown-menu a:active,
.dropdown-menu a:focus {
    color: #111827;
    background-color: #eef2ff;
    box-shadow: none;
}

.login-panel {
    width: auto;
    max-width: 420px;
    min-width: 0;
    margin: 0;
    padding: 0.75rem 1rem;
    background-color: #ffffff;
    border: 1px solid #d1d5db;
    border-radius: 12px;
    display: flex;
    flex-wrap: wrap;
    align-items: center;
    justify-content: space-between;
    gap: 0.75rem;
    box-shadow: 0 2px 6px rgba(15, 23, 42, 0.05);
}

.login-inputs {
    display: flex;
    align-items: center;
    gap: 0.75rem;
    flex-wrap: wrap;
}

.login-inputs label {
    font-weight: 700;
    color: #111827;
}

.login-controls {
    display: flex;
    align-items: center;
    gap: 0.5rem;
    flex-wrap: wrap;
}

.login-controls button {
    padding: 0.55rem 1rem;
    background-color: #2563eb;
    color: #ffffff;
    border: none;
    border-radius: 10px;
    cursor: pointer;
}

.login-controls button:hover {
    background-color: #1d4ed8;
}

.login-inputs input {
    padding: 0.55rem 0.75rem;
    border: 1px solid #d1d5db;
    border-radius: 10px;
}

.user-label-label {
    font-weight: 700;
    color: #111827;
}

.login-inputs button {
    padding: 0.55rem 1rem;
    background-color: #2563eb;
    color: #ffffff;
    border: none;
    border-radius: 10px;
    cursor: pointer;
}

.login-inputs button:hover {
    background-color: #1d4ed8;
}

.user-label {
    display: inline-flex;
    align-items: center;
    min-width: 180px;
    max-width: 220px;
    padding: 0.55rem 0.75rem;
    border: 1px solid #d1d5db;
    border-radius: 10px;
    background-color: #ffffff;
    color: #111827;
    font-weight: 700;
    white-space: nowrap;
    overflow: hidden;
    text-overflow: ellipsis;
}

.user-label[hidden] {
    display: none;
}

.login-panel.logged-in {
    justify-content: space-between;
}

.logout-block {
    display: flex;
    align-items: center;
    gap: 0.5rem;
}

.user-name-small {
    display: inline-flex;
    align-items: center;
    padding: 0.35rem 0.55rem;
    border: 1px solid #d1d5db;
    border-radius: 10px;
    background-color: #f8fafc;
    color: #334155;
    font-size: 0.85rem;
    min-width: 5rem;
    max-width: 9rem;
    white-space: nowrap;
    overflow: hidden;
    text-overflow: ellipsis;
}

.return-button {
    width: calc(100vw - 40px);
    max-width: 100%;
    margin: 0 auto 1rem;
    padding: 0.75rem 1rem;
    background-color: #ffffff;
    border: 1px solid #d1d5db;
    border-radius: 12px;
    display: flex;
    align-items: center;
    box-shadow: 0 2px 6px rgba(15, 23, 42, 0.05);
}

.return-button a {
    color: #111827;
    text-decoration: none;
    font-weight: 700;
}

.return-button a:hover {
    color: #0f172a;
}

.popup-overlay {
    position: fixed;
    inset: 0;
    background: rgba(15, 23, 42, 0.45);
    display: flex;
    align-items: center;
    justify-content: center;
    padding: 1rem;
    z-index: 999;
}

.popup-overlay[hidden] {
    display: none;
}

.popup-content {
    width: min(520px, 100%);
    background-color: #ffffff;
    border-radius: 16px;
    padding: 1.5rem;
    box-shadow: 0 18px 40px rgba(15, 23, 42, 0.18);
}

.popup-content h2 {
    margin-top: 0;
    font-size: 1.5rem;
}

.popup-content p {
    margin: 0.75rem 0 1rem;
    color: #334155;
    line-height: 1.5;
}

.popup-content .login-inputs {
    display: flex;
    align-items: center;
    gap: 0.75rem;
    flex-wrap: wrap;
}

.popup-buttons {
    display: flex;
    justify-content: flex-end;
    gap: 0.75rem;
    margin-top: 1rem;
}

.popup-content button#popupCloseButton {
    margin-top: 1rem;
    background-color: #6c757d;
    color: white;
    border: none;
    padding: 0.8rem 1rem;
    border-radius: 10px;
    cursor: pointer;
}

.popup-content button#popupCloseButton:hover {
    background-color: #565e64;
}

.popup-content button#popupLoginButton {
    background-color: #3168ff;
    color: white;
    border: none;
    padding: 0.8rem 1rem;
    border-radius: 10px;
    cursor: pointer;
}

.popup-content button#popupLoginButton:hover {
    background-color: #1f4ed6;
}

.result-progress-container {
    width: min(90%, 760px);
    max-width: 760px;
    margin: 0 auto 1rem;
}

.result-progress {
    width: 100%;
    height: 1.5rem;
    border-radius: 999px;
    background-color: #e5e7eb;
    overflow: hidden;
    display: flex;
    margin-bottom: 0.5rem;
}

.result-progress__fill {
    height: 100%;
    transition: width 0.3s ease;
}

.result-progress__fill--correct {
    background-color: #16a34a;
    width: 0%;
}

.result-progress__fill--wrong {
    background-color: #dc2626;
    width: 0%;
}

.result-progress__text {
    display: flex;
    justify-content: center;
    gap: 1.5rem;
    font-weight: 700;
    color: #111827;
}

.result-progress__text span {
    white-space: nowrap;
}

#feedback {
    margin-top: 1rem;
    padding: 1rem;
    border-radius: 12px;
    background-color: #f8f8f8;
    color: #222;
    min-height: 3rem;
}

#feedback.correct {
    border: 2px solid #2fa84f;
    background-color: #e8f7ea;
    color: #1f5d33;
}

#feedback.wrong {
    border: 2px solid #d93926;
    background-color: #fde7e5;
    color: #6f1e16;
}

#checkButton {
    margin-top: 0.75rem;
    padding: 0.8rem 1.25rem;
    border: none;
    border-radius: 10px;
    font-size: 1rem;
    cursor: pointer;
    background-color: #3168ff;
    color: white;
    transition: background-color 0.2s ease;
}

#checkButton:hover {
    background-color: #1f4ed6;
}

#checkButton.correct {
    background-color: #2fa84f;
    color: white;
}

#checkButton.wrong {
    background-color: #d93926;
    color: white;
}

#nextButton {
    margin-top: 0.75rem;
    padding: 0.8rem 1.25rem;
    border: none;
    border-radius: 10px;
    font-size: 1rem;
    cursor: pointer;
    background-color: #3168ff;
    color: white;
    transition: background-color 0.2s ease;
}

#nextButton:hover {
    background-color: #1f4ed6;
}

button.secondary {
    background-color: #6c757d;
}

.option-group {
    display: flex;
    flex-wrap: wrap;
    gap: 0.6rem;
    margin-bottom: 1rem;
}

.option-input {
    width: 100%;
    max-width: 340px;
    padding: 0.85rem 1rem;
    border: 2px solid #d1d5db;
    border-radius: 12px;
    background-color: white;
    color: #1f2937;
    font-size: 1rem;
    outline: none;
    transition: border-color 0.2s ease, box-shadow 0.2s ease;
}

.option-input:focus {
    border-color: #3168ff;
    box-shadow: 0 0 0 4px rgba(49, 104, 255, 0.12);
}

.fixed-value {
    padding: 0.85rem 1rem;
    border-radius: 12px;
    background-color: #f8fafc;
    border: 1px solid #e2e8f0;
    color: #111827;
    font-weight: 700;
    min-width: 14rem;
}

.option-button {
    padding: 0.8rem 1rem;
    border: 2px solid #3168ff;
    border-radius: 12px;
    background-color: white;
    color: #1f2937;
    cursor: pointer;
    transition: background-color 0.2s ease, border-color 0.2s ease, color 0.2s ease;
    min-width: 8rem;
    text-align: center;
}

.option-button:hover {
    background-color: #eef4ff;
}

.option-button.selected {
    background-color: #3168ff;
    border-color: #1f4ed6;
    color: white;
}

.section-card {
    background-color: white;
    border: 1px solid #e5e7eb;
    border-radius: 16px;
    padding: 1rem;
    margin-bottom: 1rem;
    box-shadow: 0 8px 24px rgba(15, 23, 42, 0.04);
}

.test-header {
    display: flex;
    flex-wrap: wrap;
    justify-content: space-between;
    gap: 1rem;
    margin-bottom: 1rem;
}

.button-row {
    display: flex;
    flex-wrap: wrap;
    gap: 0.75rem;
    margin-top: 1rem;
}

.option-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(120px, 1fr));
    gap: 0.75rem;
    margin-top: 0.75rem;
}

.option-checkbox,
.option-radio {
    display: flex;
    align-items: center;
    gap: 0.5rem;
    border: 1px solid #d1d5db;
    border-radius: 12px;
    padding: 0.8rem 1rem;
    background-color: #ffffff;
    cursor: pointer;
    user-select: none;
}

.option-checkbox:hover,
.option-radio:hover {
    background-color: #f8fafc;
}

.option-checkbox input,
.option-radio input {
    margin: 0;
}

.option-radio input {
    accent-color: #3168ff;
}

.fixed-stop-button {
    position: fixed;
    right: 1rem;
    bottom: 1rem;
    z-index: 1000;
    padding: 0.85rem 1.25rem;
    background-color: #dc2626;
    color: white;
    border: none;
    border-radius: 999px;
    cursor: pointer;
    box-shadow: 0 14px 36px rgba(0, 0, 0, 0.18);
}

.completion-summary {
    margin-top: 1.5rem;
    padding: 1.5rem;
    border-radius: 16px;
    background-color: white;
    border: 1px solid #e5e7eb;
    box-shadow: 0 10px 30px rgba(15, 23, 42, 0.05);
}

.results-table {
    width: 100%;
    border-collapse: collapse;
    margin-top: 1rem;
    background-color: white;
}

.results-table th,
.results-table td {
    padding: 0.85rem 1rem;
    border: 1px solid #e5e7eb;
    text-align: left;
}

.results-table th {
    background-color: #f8fafc;
    font-weight: 700;
}

.bar-group {
    margin-bottom: 1rem;
}

.bar-label {
    font-weight: 700;
    margin-bottom: 0.5rem;
    color: #111827;
}

.bar-track {
    display: flex;
    height: 1.2rem;
    background-color: #e5e7eb;
    border-radius: 999px;
    overflow: hidden;
}

.bar-correct {
    background-color: #16a34a;
    min-width: 0;
}

.bar-wrong {
    background-color: #dc2626;
    min-width: 0;
}

.bar-values {
    display: flex;
    justify-content: space-between;
    margin-top: 0.5rem;
    color: #475569;
    font-size: 0.95rem;
}

.results-login,
.results-user {
    margin-top: 1rem;
}

.results-user {
    font-weight: 700;
    color: #111827;
}

.popup-actions {
    display: flex;
    flex-wrap: wrap;
    justify-content: flex-end;
    gap: 0.75rem;
    margin-top: 1rem;
}

@media (max-width: 800px) {
    .test-header,
    .button-row,
    .popup-actions {
        flex-direction: column;
        align-items: stretch;
    }
    .results-table th,
    .results-table td {
        font-size: 0.95rem;
    }
}

.popup-overlay {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background-color: rgba(0, 0, 0, 0.5);
    display: flex;
    justify-content: center;
    align-items: center;
    z-index: 1000;
}

.popup-content {
    background-color: white;
    padding: 2rem;
    border-radius: 12px;
    max-width: 400px;
    width: 90%;
    text-align: center;
    box-shadow: 0 4px 6px rgba(0, 0, 0, 0.1);
}

.popup-content h2 {
    margin-top: 0;
    color: #111827;
}

.popup-content p {
    color: #6b7280;
    margin-bottom: 1.5rem;
}

.popup-content .login-inputs {
    display: flex;
    flex-direction: column;
    gap: 0.75rem;
    margin-bottom: 1.5rem;
}

.popup-content .login-inputs input {
    padding: 0.75rem;
    border: 1px solid #d1d5db;
    border-radius: 8px;
}

.popup-content .login-inputs button {
    padding: 0.75rem;
    background-color: #2563eb;
    color: white;
    border: none;
    border-radius: 8px;
    cursor: pointer;
}

.popup-content .login-inputs button:hover {
    background-color: #1d4ed8;
}

@media (max-width: 900px) {
    body {
        padding: 0 1rem 1rem 1rem;
    }

    header {
        flex-wrap: wrap;
        justify-content: space-between;
        gap: 1rem;
        padding: 1rem;
    }

    .hamburger-menu {
        order: 0;
    }

    header h1 {
        flex: 1 1 100%;
        min-width: 0;
        text-align: center;
        font-size: 1.75rem;
        order: 1;
    }

    .login-panel {
        width: 100%;
        max-width: 100%;
        justify-content: flex-end;
        order: 2;
    }

    .login-inputs {
        width: 100%;
        justify-content: flex-end;
        gap: 0.5rem;
    }

    .login-inputs label {
        flex: 0 0 auto;
    }

    .login-controls,
    .logout-block {
        width: 100%;
        justify-content: flex-end;
    }

    .dropdown-menu {
        left: 1rem;
        right: auto;
        min-width: 220px;
        width: 220px;
    }
}

@media (max-width: 600px) {
    body {
        padding: 0 0.75rem 1rem 0.75rem;
    }

    header {
        padding: 0.75rem 0.75rem;
    }

    header h1 {
        font-size: 1.5rem;
    }

    .login-panel {
        width: 100%;
        max-width: 100%;
        padding: 0.75rem;
    }

    .login-inputs {
        flex-direction: column;
        align-items: stretch;
        gap: 0.5rem;
    }

    .login-controls,
    .logout-block {
        width: 100%;
        justify-content: space-between;
    }

    .login-inputs label,
    .user-label,
    .user-name-small {
        width: 100%;
        text-align: left;
    }

    .dropdown-menu {
        width: calc(100% - 1.5rem);
        left: 0.75rem;
    }
}