:root {
    --bg: #eef3f8;
    --bg-accent: #d8e7ff;
    --surface: #ffffff;
    --surface-soft: #f6f9fc;
    --text: #142033;
    --muted: #5a6a80;
    --line: #d5dfeb;
    --primary: #0a84ff;
    --primary-strong: #056ad1;
    --ok: #1f9d55;
    --warn: #d67a00;
    --error: #d43f3a;
    --radius: 16px;
    --shadow: 0 16px 34px rgba(15, 37, 64, 0.12);
    font-family: "Aptos", "Segoe UI", "Trebuchet MS", sans-serif;
}

* {
    box-sizing: border-box;
}

body {
    margin: 0;
    color: var(--text);
    display: flex;
    align-items: center;
    justify-content: center;
    background:
        radial-gradient(circle at 10% 10%, rgba(10, 132, 255, 0.16), transparent 35%),
        radial-gradient(circle at 90% 20%, rgba(31, 157, 85, 0.12), transparent 30%),
        linear-gradient(145deg, var(--bg), var(--bg-accent));
    min-height: 100vh;
    padding: 1.25rem 0;
}

.app-shell {
    width: min(980px, 94vw);
    margin: 0 auto;
    border: 1px solid var(--line);
    border-radius: calc(var(--radius) + 6px);
    background: rgba(255, 255, 255, 0.84);
    backdrop-filter: blur(4px);
    box-shadow: var(--shadow);
    overflow: hidden;
}

.app-topbar {
    display: flex;
    justify-content: space-between;
    align-items: center;
    gap: 1rem;
    padding: 1rem 1.4rem;
    border-bottom: 1px solid var(--line);
    background: linear-gradient(90deg, #ffffff, #f2f7ff);
}

.brand {
    display: flex;
    align-items: center;
    gap: 0.75rem;
}

.brand__dot {
    width: 14px;
    height: 14px;
    border-radius: 50%;
    background: var(--primary);
    box-shadow: 0 0 0 6px rgba(10, 132, 255, 0.14);
}

.brand h1 {
    margin: 0;
    font-size: 1.08rem;
    letter-spacing: 0.02em;
}

.app-topbar__meta {
    margin: 0;
    color: var(--muted);
    font-weight: 600;
    font-size: 0.92rem;
}

.app-main {
    display: grid;
    grid-template-columns: 1.35fr 1fr;
    gap: 1rem;
    padding: 1rem;
}

.panel {
    border: 1px solid var(--line);
    border-radius: var(--radius);
    background: var(--surface);
    padding: 1rem;
}

.panel__head {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 1rem;
    gap: 0.8rem;
}

.panel__head h2 {
    margin: 0;
    font-size: 1rem;
}

.control-row {
    display: flex;
    align-items: center;
    gap: 0.5rem;
}

.control-row label {
    font-size: 0.82rem;
    color: var(--muted);
    font-weight: 700;
}

.control-row select {
    border: 1px solid var(--line);
    border-radius: 10px;
    padding: 0.42rem 0.6rem;
    background: #fff;
    color: var(--text);
    font-weight: 600;
}

.control-row select:focus {
    outline: 2px solid rgba(10, 132, 255, 0.3);
    border-color: var(--primary);
}

.chip {
    padding: 0.3rem 0.6rem;
    border-radius: 999px;
    font-size: 0.76rem;
    font-weight: 700;
    color: var(--primary-strong);
    background: rgba(10, 132, 255, 0.12);
    border: 1px solid rgba(10, 132, 255, 0.28);
}

.predictor__form {
    display: grid;
    gap: 1rem;
}

.form-grid {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 0.8rem;
}

.form-field {
    display: grid;
    gap: 0.4rem;
}

.form-field label {
    font-size: 0.84rem;
    color: var(--muted);
    font-weight: 600;
}

.form-field input {
    width: 100%;
    border: 1px solid var(--line);
    border-radius: 10px;
    background: var(--surface-soft);
    padding: 0.72rem 0.72rem;
    color: var(--text);
    font-size: 0.96rem;
}

.form-field input:focus {
    outline: 2px solid rgba(10, 132, 255, 0.35);
    border-color: var(--primary);
}

.actions {
    display: flex;
    gap: 0.6rem;
}

.btn {
    border: 1px solid transparent;
    border-radius: 10px;
    background: var(--primary);
    color: #fff;
    font-weight: 700;
    padding: 0.68rem 0.92rem;
    cursor: pointer;
    transition: transform 0.15s ease, background 0.2s ease;
}

.btn:hover {
    background: var(--primary-strong);
    transform: translateY(-1px);
}

.btn--ghost {
    background: #fff;
    color: var(--text);
    border-color: var(--line);
}

.btn--ghost:hover {
    background: #f2f6fb;
}

.predictor__result {
    min-height: 190px;
    border: 1px solid var(--line);
    border-radius: 12px;
    background: #fcfdff;
    padding: 1rem;
    display: grid;
    align-content: start;
    gap: 0.52rem;
    transition: border-color 0.2s ease, background 0.2s ease;
}

.predictor__headline {
    margin: 0;
    font-size: 1.08rem;
}

.predictor__detail,
.predictor__confidence {
    margin: 0;
    color: var(--muted);
    line-height: 1.45;
}

.predictor__result.is-occupied {
    border-color: rgba(214, 122, 0, 0.5);
    background: rgba(214, 122, 0, 0.08);
}

.predictor__result.is-clear {
    border-color: rgba(31, 157, 85, 0.5);
    background: rgba(31, 157, 85, 0.08);
}

.predictor__result.is-error {
    border-color: rgba(212, 63, 58, 0.6);
    background: rgba(212, 63, 58, 0.08);
}

.quick-values {
    margin-top: 0.9rem;
    display: grid;
    gap: 0.5rem;
}

.quick-values__btn {
    border: 1px solid var(--line);
    border-radius: 10px;
    background: #fff;
    color: var(--text);
    text-align: left;
    padding: 0.6rem 0.74rem;
    font-weight: 600;
    cursor: pointer;
}

.quick-values__btn:hover {
    border-color: var(--primary);
    background: #f2f8ff;
}

.app-footer {
    border-top: 1px solid var(--line);
    padding: 0.8rem 1.2rem;
    background: linear-gradient(90deg, #f8fbff, #ffffff);
}

.app-footer p {
    margin: 0;
    color: var(--muted);
    font-size: 0.84rem;
}

@media (max-width: 840px) {
    .app-main {
        grid-template-columns: 1fr;
    }

    .form-grid {
        grid-template-columns: 1fr;
    }

    .app-topbar {
        flex-direction: column;
        align-items: flex-start;
    }

    .panel__head {
        flex-direction: column;
        align-items: flex-start;
    }
}