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

body {
    font-family: 'Helvetica', 'Arial', sans-serif;
    background-color: #f4f7f6;
    color: #333;
    line-height: 1.6;
    padding: 20px;
    display: flex;
    justify-content: center;
    align-items: flex-start;
    min-height: 100vh;
}

.container {
    background-color: white;
    border-radius: 12px;
    box-shadow: 0 5px 15px rgba(0, 0, 0, 0.1);
    padding: 32px;
    width: 100%;
    max-width: 920px;
    margin-top: 20px;
}

h1 {
    text-align: center;
    margin-bottom: 12px;
    color: #1f3a68;
    font-size: 1.9rem;
    line-height: 1.25;
}

.intro {
    text-align: center;
    margin: 0 auto 22px;
    max-width: 640px;
    color: #5f6b7a;
}

/* ---- controls ---------------------------------------------------------- */
.controls {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 18px;
    margin-bottom: 18px;
}

select {
    width: 100%;
    padding: 12px;
    border: 1px solid #d5dbe3;
    border-radius: 6px;
    font-size: 15px;
    background-color: #f9fafb;
    color: #333;
    transition: border-color 0.2s;
}

select:focus {
    border-color: #1f73e0;
    outline: none;
}

/* ---- pickers: search box + scrollable list + slider -------------------- */
.picker {
    position: relative;
    min-width: 0;
}

.picker-label {
    display: block;
    font-size: 0.8rem;
    font-weight: bold;
    color: #5f6b7a;
    text-transform: uppercase;
    letter-spacing: 0.04em;
    margin-bottom: 4px;
}

.combo {
    position: relative;
}

.combo-input {
    width: 100%;
    padding: 12px;
    border: 1px solid #d5dbe3;
    border-radius: 6px;
    font-size: 15px;
    font-family: inherit;
    background-color: #f9fafb;
    color: #333;
    transition: border-color 0.2s;
}

.combo-input {
    padding-right: 38px; /* room for the clear button */
}

/* hide the browser's own clear icon: it only erased the text */
.combo-input::-webkit-search-cancel-button {
    -webkit-appearance: none;
    appearance: none;
    display: none;
}

.combo-clear {
    position: absolute;
    top: 50%;
    right: 6px;
    transform: translateY(-50%);
    width: 28px;
    height: 28px;
    padding: 0;
    border: none;
    border-radius: 50%;
    background: transparent;
    color: #8a94a3;
    font-size: 20px;
    font-weight: normal;
    line-height: 28px;
    text-align: center;
}

.combo-clear:hover:not(:disabled) {
    background: #eef1f5;
    color: #1f3a68;
}

.combo-clear[hidden] {
    display: none;
}

.combo-input:focus {
    border-color: #1f73e0;
    background-color: #fff;
    outline: none;
}

.combo-list {
    position: absolute;
    top: calc(100% + 4px);
    left: 0;
    right: 0;
    z-index: 10;
    max-height: 280px;
    overflow-y: auto;
    list-style: none;
    background: #fff;
    border: 1px solid #d5dbe3;
    border-radius: 6px;
    box-shadow: 0 8px 20px rgba(31, 58, 104, 0.15);
    padding: 4px 0;
}

.combo-list li {
    padding: 7px 12px;
    font-size: 0.9rem;
    cursor: pointer;
    display: flex;
    justify-content: space-between;
    gap: 8px;
}

.combo-text {
    min-width: 0;
}

.combo-list li.active {
    background: #eaf2fd;
}

.combo-list li.chosen {
    font-weight: bold;
    color: #1f3a68;
}

.combo-list li.combo-empty {
    color: #8a94a3;
    cursor: default;
}

.combo-list mark {
    background: #fff1b8;
    color: inherit;
    border-radius: 2px;
}

.combo-badge {
    flex-shrink: 0;
    font-size: 0.75rem;
    color: #11643a;
    background: #e3f5ea;
    border-radius: 10px;
    padding: 1px 7px;
    align-self: center;
}

.slider-row {
    display: flex;
    align-items: center;
    gap: 10px;
    margin-top: 8px;
}

.picker-slider.unset {
    opacity: 0.45;
}

.picker-slider {
    flex: 1;
    min-width: 0;
    accent-color: #1f73e0;
    cursor: pointer;
}

.slider-value {
    font-size: 0.78rem;
    color: #8a94a3;
    white-space: nowrap;
    min-width: 76px;
    text-align: right;
}

/* the assignment's <select>s stay in the DOM as the source of truth */
.native-select {
    position: absolute !important;
    width: 1px !important;
    height: 1px !important;
    padding: 0 !important;
    border: 0 !important;
    overflow: hidden;
    clip: rect(0 0 0 0);
    white-space: nowrap;
}

.buttons {
    display: flex;
    justify-content: center;
    gap: 12px;
    flex-wrap: wrap;
}

button {
    padding: 12px 26px;
    background-color: #1f73e0;
    color: white;
    border: 1px solid #1f73e0;
    border-radius: 6px;
    font-size: 16px;
    font-weight: bold;
    cursor: pointer;
    transition: background-color 0.2s;
}

button:hover:not(:disabled) {
    background-color: #155bb5;
}

#recommend-btn {
    background-color: white;
    color: #1f73e0;
}

#recommend-btn:hover:not(:disabled) {
    background-color: #eaf2fd;
}

button:disabled {
    opacity: 0.5;
    cursor: wait;
}

.status {
    text-align: center;
    font-size: 0.85rem;
    color: #8a94a3;
    margin: 12px 0 18px;
}

.error {
    color: #c0392b;
}

/* ---- prediction card (mirrors the assignment mock-up) ------------------ */
.prediction-card {
    background: #fff;
    border: 1px solid #e3e8ef;
    border-left: 5px solid #1f73e0;
    border-radius: 8px;
    box-shadow: 0 2px 8px rgba(31, 58, 104, 0.08);
    padding: 18px 20px;
    margin-bottom: 22px;
}

.prediction-title {
    text-align: center;
    font-weight: bold;
    color: #1f3a68;
    margin-bottom: 10px;
}

.prediction-grid {
    display: grid;
    grid-template-columns: 1fr 1fr;
}

.prediction-cell {
    text-align: center;
    padding: 4px 10px;
}

.prediction-cell + .prediction-cell {
    border-left: 1px solid #e3e8ef;
}

.prediction-label {
    font-weight: bold;
    color: #1f3a68;
}

.prediction-value {
    font-size: 2.2rem;
    font-weight: bold;
    color: #1f3a68;
    line-height: 1.2;
}

.prediction-sub {
    color: #5f6b7a;
}

.prediction-evidence {
    font-size: 0.8rem;
    color: #8a94a3;
}

.note {
    text-align: center;
    font-size: 0.85rem;
    color: #5f6b7a;
    margin-top: 10px;
}

/* ---- Top-5 result columns ---------------------------------------------- */
#result-box {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 16px;
}

.result-column {
    background-color: #f5f8fc;
    padding: 18px 20px;
    border-radius: 8px;
    border-left: 4px solid #1f73e0;
}

.result-column h2 {
    font-size: 1.05rem;
    color: #1f3a68;
    margin-bottom: 8px;
}

.result-column p {
    color: #2c3e50;
    font-size: 0.92rem;
}

.rec-intro {
    margin-bottom: 8px;
}

.result-column ol {
    padding-left: 22px;
}

.result-column li {
    margin-bottom: 8px;
}

.rec-title {
    font-weight: bold;
    color: #1f3a68;
}

.rec-score {
    float: right;
    color: #1f73e0;
    font-weight: bold;
    margin-left: 8px;
}

.rec-detail {
    display: block;
    font-size: 0.78rem;
    color: #8a94a3;
}

.timing {
    font-size: 0.75rem;
    color: #8a94a3 !important;
    margin-top: 6px;
    text-align: right;
}

.footnote {
    font-size: 0.75rem;
    color: #8a94a3;
    text-align: center;
    margin-top: 20px;
}

@media (max-width: 640px) {
    .container {
        padding: 20px 16px;
    }

    .controls,
    #result-box,
    .prediction-grid {
        grid-template-columns: 1fr;
    }

    .prediction-cell + .prediction-cell {
        border-left: none;
        border-top: 1px solid #e3e8ef;
        margin-top: 8px;
        padding-top: 8px;
    }
}