:root {
    --bg-color: #000000;
    --window-bg: #121212;

    --primary-text: #ffffff;
    --secondary-text: #dddddd;
    --body-text: #b0b3b8;
    --muted-text: #666666;

    --accent-color: #333333;
    --accent-hover: #4d4d4d;
    --border-color: #2a2a2a;
    --input-bg: #1a1a1a;

    --danger-color: #e74c3c;
    --focus-outline: #2a2a2a;

    --app-width: clamp(15rem, 60vw, 45rem);

    --fluid-font-size: clamp(0.75rem, 1.1vw, 1rem);
}

@font-face {
    font-family: 'Ubuntu';
    src: url('fonts/ubuntu.ttf') format('truetype');
}

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

body {
    font-family: 'Ubuntu';
    background-color: var(--bg-color);
    color: var(--body-text);
    margin: 0;
    padding: 0;
    display: flex;
    flex-direction: column;
    min-height: 100vh;
    overflow-x: hidden;
    font-size: var(--fluid-font-size);
}

.container {
    width: 90%;
    max-width: 80rem;

    margin: 0 auto;
    padding: 0.8rem;
    text-align: center;
    flex:1;
    display: flex;
    flex-direction: column;
    justify-content: center;
}

h1, h2 {
    color: var(--primary-text);
    margin-top: 0;
    font-weight: 300;
    letter-spacing: 0.06rem;
    word-wrap: break-word;
}

h1 {
    font-size: 1.8rem;
    margin-bottom: 0.2rem;
}
h2 { font-size: 1.4rem; }

h3 {
    color: var(--secondary-text);
    font-weight: 400;
    font-size: 0.9rem;
    margin-top: 0;
    margin-bottom: 1rem;
}

.hidden { display: none !important; }

.btn {
    background-color: var(--accent-color);
    color: white;
    border: 0.06rem solid var(--border-color);
    padding: 0.6rem 1.5rem;
    font-size: 0.9rem;
    font-weight: 400;
    cursor: pointer;
    border-radius: 0.25rem;
    transition: none;
    margin: 0.4rem;
    letter-spacing: 0.03rem;
    display: inline-block;
    text-decoration: none;
}

.btn:hover {
    background-color: var(--accent-hover);
    border-color: #555;
    color: #fff;
}

.btn:active {
    background-color: #222;
    transform: translateY(0.06rem);
}

.btn:focus-visible {
    outline: 0.1rem solid var(--focus-outline);
    outline-offset: 0.1rem;
}

.btn:disabled {
    background-color: #080808;
    color: #333;
    cursor: not-allowed;
    border-color: #080808;
}

.btn-confirm {
    background-color: #333;
    border-color: #444;
}
.btn-confirm:hover { background-color: #444; }

.btn-cancel {
    background-color: #111;
    color: #888;
    border-color: #222;
}
.btn-cancel:hover { color: #ccc; background-color: #222; }

.btn-finish {
    background-color: #444;
    border-color: #555;
}

.instruction-box {
    background: var(--window-bg);
    padding: 1.8rem;
    border-radius: 0.25rem;
    border: 0.06rem solid var(--border-color);

    width: 100%;
    max-width: 36rem;
    margin: 0 auto 1rem auto;

    text-align: left;
    max-height: 60vh;
    overflow-y: auto;
    line-height: 1.5;
    color: var(--body-text);
}

.instruction-box::-webkit-scrollbar { width: 0.5rem; }
.instruction-box::-webkit-scrollbar-track { background: #000; }
.instruction-box::-webkit-scrollbar-thumb { background: #333; border-radius: 0.25rem; }
.instruction-box::-webkit-scrollbar-thumb:hover { background: #444; }

.form-group { margin-bottom: 1rem; text-align: left; }
label { display: block; margin-bottom: 0.4rem; font-weight: 600; color: var(--secondary-text); font-size: 0.85em; }

select, input {
    width: 100%; padding: 0.6rem;
    background-color: var(--input-bg);
    border: 0.06rem solid var(--border-color);
    color: #ccc; border-radius: 0.25rem;
    box-sizing: border-box; font-size: 0.9rem;
    transition: none;
}
select:focus, input:focus {
    outline: 0.1rem solid var(--focus-outline);
    border-color: #555;
    background-color: #222;
}

#test-screen { padding-top: 1rem; }

.test-wrapper {
    display: grid;
    grid-template-columns:1fr;
    width: fit-content;
    max-width: var(--app-width);
    margin: 0 auto;
}

.timer-bar {
    background: #080808; height: 0.2rem;
    border-radius: 0;
    margin-bottom: 0.5rem;
    overflow: hidden;    position: relative;
    border: 0.06rem solid #1a1a1a;
    width: 100%;
}
.timer-progress { background: #ffffff; height: 100%; width: 100%; transition: width 1s linear; }
.timer-text {
    position: absolute; width: 100%; text-align: center; top: -1.2rem;
    line-height: 1rem; font-weight: 300; color: var(--secondary-text);
    font-size: 0.9rem; z-index: 2; letter-spacing: 0.1rem;
}

.progress-info { margin-bottom: 0.5rem; margin-top: 0.2rem; font-weight: 600; color: var(--muted-text); text-transform: uppercase; font-size: 0.7rem; letter-spacing: 0.1rem; }

.question-area {
    background: var(--window-bg);
    padding: 0.6rem;
    border-radius: 0.25rem;
    border: 0.06rem solid var(--border-color);

    margin-bottom: 0.8rem;
    width: 100%;

    display: flex; justify-content: center; align-items: center;
}

.question-image {
    width: 100%;
    height: auto;
    max-height: 50vh;
    max-width: 100%;
    object-fit: contain;
    transition: opacity 0.1s ease-out;
    will-change: contents, opacity;

    border: 0.06rem solid var(--border-color);
    background: #000;
    box-shadow: 0 0.2rem 0.3rem rgba(0,0,0,0.3);
}

.options-grid {
    display: grid;
    gap: 0.4rem;
    margin-bottom: 0.8rem;
    width: 100%;
    min-width: 14rem;
    padding: 0.4rem 0;
    grid-template-columns: repeat(4, 1fr);
}

.options-grid.cols-6 {
    grid-template-columns: repeat(3, 1fr);
}

.option-btn {
    background: var(--input-bg);
    border: 0.06rem solid var(--border-color);
    border-radius: 0.25rem;
    padding: 0.4rem;
    cursor: pointer;
    transition: none;
    display: flex; justify-content: center;
    align-items: center; font-weight: 300;
    height: clamp(2.5rem, 3vw + 1rem, 3.2rem);
    color: var(--secondary-text);
    font-size: 1.2rem;
    width: 100%;
}

.option-btn:hover {
    background: #222;
    border-color: #444;
    color: white;
}

.option-btn:active {
    transform: translateY(0.06rem);
}

.option-btn.selected {
    background-color: #2a2a2a;
    color: white;
    border-color: #555;
}

.nav-controls {
    display: flex; justify-content: center; gap: 0.4rem;
    margin-top: 0.4rem;
    width: 100%;
}

.results-wrapper {
    display: flex;
    gap: 0.8rem;
    width: 100%;
    max-width: 65rem;
    margin: 0 auto;
    align-items: stretch;
    margin-bottom: 1rem;
    flex-wrap: wrap;
}

.result-card.main-card {
    flex: 2;
    display: flex;
    flex-direction: column;
    min-width: 15rem;
    overflow-x: auto;
}

.right-column {
    flex: 1;
    display: flex;
    flex-direction: column;
    gap: 0.8rem;
    min-width: 15rem;
}

.result-card, .sub-card {
    background: var(--window-bg);
    padding: 1.2rem;
    border-radius: 0.25rem;
    border: 0.06rem solid var(--border-color);
    text-align: left;
    color: var(--body-text);
}

.result-card h3, .sub-card h3 {
    margin-top: 0;
    border-bottom: 0.06rem solid #222;
    padding-bottom: 0.4rem;
    margin-bottom: 0.6rem;
    font-size: 0.9rem;
    text-transform: uppercase;
    letter-spacing: 0.06rem;
    color: #888;
}

.sub-card {
    flex: 1;
    display: flex;
    flex-direction: column;
}

.sub-card p {
    line-height: 1.5;
    flex-grow: 0;
}

.score-big {
    font-size: 3em;
    color: white;
    font-weight: 100;
    text-align: center;
    display: block;
    margin: 0.4rem 0 0.8rem 0;
    letter-spacing: -0.1rem;
    line-height: 1;
}

.score-big::after {
    content: " IQ";
    font-size: 0.4em;
    margin-left: 0.2rem;
    color: var(--muted-text);
    letter-spacing: 0px;
    vertical-align: baseline;
    font-weight: 100;
}

.diagnosis-text {
    text-align: center; font-size: 1em; margin-bottom: 0.8rem;
    font-weight: 300; color: var(--secondary-text);
}

.stats-container {
    display: flex;
    justify-content: space-between;
    background: #0a0a0a;
    border: 0.06rem solid #1a1a1a;
    border-radius: 0.25rem;
    padding: 0.6rem 1rem;
    margin-bottom: 0.8rem;
    flex-wrap: wrap;
}

.stat-group {
    display: flex;
    flex-direction: column;
    align-items: center;
    flex: 1;
    border-right: 0.06rem solid #222;
    padding: 0.2rem;
}

.stat-group:last-child {
    border-right: none;
}

.stat-label {
    font-size: 0.65rem;
    text-transform: uppercase;
    color: var(--muted-text);
    letter-spacing: 0.05rem;
    margin-bottom: 0.2rem;
}

.stat-value {
    font-size: 0.9rem;
    color: var(--primary-text);
    font-weight: 500;
    word-break: break-word;
    text-align: center;
}

#reliability-msg {
margin-top: 0.8rem;
padding: 0.6rem;
border: 0.06rem solid var(--border-color);
background-color: var(--input-bg);
border-radius: 0.25rem;
text-align: center;
font-size: 0.8rem;
color: var(--body-text);
}

table {
    display: table;
    width: 100%;
    min-width: 35rem;

    border-collapse: collapse;
    margin-top: 0.4rem;
    white-space: nowrap;
}

thead { display: table-header-group; }
tbody { display: table-row-group; }
tr { display: table-row; }
td, th { display: table-cell; }

th, td { border: 0.06rem solid #222; padding: 0.4rem; text-align: center; }
thead th {
    background-color: #080808; color: var(--muted-text);
    font-weight: 600; border-bottom: 0.1rem solid #333;
    text-transform: uppercase; font-size: 0.7rem; letter-spacing: 0.05rem;
}
tbody td { background-color: #000000; color: var(--body-text); }

.alert-warning { color: var(--danger-color); font-weight: 600; }
.alert-danger { color: var(--danger-color); font-weight: 600; }
.alert-success { color: #b0b3b8; font-weight: 600; }

.modal-overlay {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background-color: rgba(0, 0, 0, 0.85);
    z-index: 1000;
    display: flex;
    justify-content: center;
    align-items: center;
    backdrop-filter: blur(4px);
}

.modal-content {
    background: var(--window-bg);
    padding: 2rem;
    border: 0.06rem solid var(--border-color);
    border-radius: 0.25rem;
    max-width: 25rem;
    width: 90%;
    text-align: center;
    box-shadow: 0 0.5rem 1rem rgba(0,0,0,0.5);
}

.modal-content h3 {
    color: var(--primary-text);
    margin-top: 0;
    margin-bottom: 0.5rem;
    font-size: 1.2rem;
    border: none;
    padding-bottom: 0;
}

.modal-content p {
    color: var(--body-text);
    margin-bottom: 1.5rem;
    line-height: 1.4;
}

.modal-actions {
    display: flex;
    justify-content: center;
    gap: 1rem;
}

.modal-actions .btn {
    margin: 0;
    min-width: 6rem;
}

.site-footer {
    width: 90%;
    max-width: 80rem;
    margin: 1rem auto 1.5rem auto;
    padding: 0;
    background-color: transparent;
    border: none;
    text-align: center;
    color: #444444;
    font-family: 'Ubuntu';
}

.footer-content {
    display: flex;
    justify-content: center;
    align-items: center;
    gap: 0;
}

.footer-brand,
.footer-year,
.footer-link {
    font-size: 0.75rem;
    font-weight: 400;
    text-transform: uppercase;
    letter-spacing: 0.1rem;
    color: #555555;
    opacity: 0.8;
    line-height: 1.2;
    display: inline-block;
    border-right: 1px solid #333333;
    padding-right: 0.6rem;
    margin-right: 0.6rem;
}

.footer-brand {
    text-decoration: none;
    cursor: pointer;
    transition: color 0.2s ease;
}

.footer-brand:hover {
    color: #888888;
}

.footer-link {
    border-right: none;
    padding-right: 0;
    margin-right: 0;
    margin-left: 0;
    text-decoration: none;
    transition: color 0.2s ease;
    cursor: pointer;
}

.footer-link:hover {
    color: #888888;
}

@media (max-width: 64rem) {
    h1 { font-size: 1.6rem; }
    .score-big { font-size: 2.5em; }
}

@media (max-width: 48rem) {
    :root {
        --app-width: 100%;
    }

    .container {
        width: 95%;
    }

    .results-wrapper {
        max-width: 100%;
        flex-direction: column;
    }

    .result-card.main-card, .sub-card {
        min-width: 0;
        width: 100%;
        padding: 0.8rem;
    }

    table {
        width: 100%;
        min-width: 0;
        table-layout: fixed;
        font-size: 0.7rem;
        white-space: normal;
    }

    thead th {
        padding: 0.3rem 0.1rem;
        font-size: 0.65rem;
    }

    tbody td {
        padding: 0.3rem 0.1rem;
    }

    h1 { font-size: 1.4rem; }
    .score-big { font-size: 2.2em; }

    .options-grid {
        grid-template-columns: repeat(2, 1fr);
    }
    .options-grid.cols-6 {
        grid-template-columns: repeat(2, 1fr);
    }

    .nav-controls { flex-wrap: wrap; }
    .btn { width: 100%; margin: 0.2rem 0; box-sizing: border-box; }

    .stats-container {
        padding: 0.4rem 0.2rem;
    }

    .stat-group {
        padding: 0.2rem 0.1rem;
    }

    .stat-label {
        font-size: 0.55rem;
        letter-spacing: 0.03rem;
        line-height: 1.1;
    }
}

@media (max-width: 30rem) {
    body {
        min-height: 100dvh;
        min-height: 100vh;
    }

    .container {
        height: 100%;
        padding: 0.5rem;
        overflow: hidden;
    }

    .test-wrapper {
        height: 100%;
        display: flex;
        flex-direction: column;
        overflow: hidden;
    }

    .timer-bar {
        margin-bottom: 0.1rem;
        height: 0.2rem;
    }

    .progress-info {
        margin-top: 0.5rem;
        margin-bottom: 0.5rem;
        font-size: 0.6rem;
    }

    h1 { font-size: 1.1rem; }

    .timer-text {
        font-size: 0.8rem;
        top: -1rem;
    }

    .question-area {
        flex-grow: 1;
        flex-shrink: 0;
        min-height: 0;
        margin-bottom: 0.2rem;
        padding: 0.2rem;
    }

    .question-image {
        height: 100%;
        width: auto;
        max-height: none;
        max-width: 100%;
    }

    .options-grid {
        gap: 0.2rem;
        margin-bottom: 0.2rem;
        grid-template-columns: repeat(3, 1fr);
        flex-shrink: 0;
    }

    .options-grid:not(.cols-6) {
        grid-template-columns: repeat(4, 1fr);
    }

    .options-grid.cols-6 {
        grid-template-columns: repeat(3, 1fr);
    }

    .option-btn {
        height: 2.5rem;
        font-size: 1rem;
    }

    .nav-controls {
        gap: 0.2rem;
        margin-top: 0;
        flex-shrink: 0;
    }

    .btn {
        padding: 0.4rem 0.8rem;
        font-size: 0.8rem;
    }
}