/* Biến CSS nội bộ */
.water-neo-wrapper {
    --bg-white: #ffffff;
    --border-ink: 3px solid #002855; /* Xanh Navy đậm */
    --shadow-solid: 5px 5px 0px #002855;
    --shadow-push: 2px 2px 0px #002855;
    
    /* Palette Nước */
    --clr-water-light: #caf0f8;   /* Xanh biển siêu nhạt */
    --clr-water-mid: #90e0ef;     /* Xanh biển vừa */
    --clr-water-neon: #00b4d8;    /* Xanh biển nổi bật */
    --clr-alert: #ffd166;         /* Vàng cảnh báo mùa/môi trường */

    max-width: 700px;
    margin: 0 auto;
    font-family: system-ui, -apple-system, sans-serif;
    color: #002855;
    box-sizing: border-box;
}

.water-neo-wrapper * { box-sizing: border-box; }

/* Header & Banner Mùa */
.water-neo-header {
    background: var(--clr-water-mid);
    border: var(--border-ink);
    box-shadow: var(--shadow-solid);
    padding: 24px;
    border-radius: 16px 16px 0 0;
    text-align: center;
}

.water-neo-header h2 { margin: 0 0 10px 0; font-size: 2rem; font-weight: 900; }

.water-season-alert {
    background: var(--clr-alert);
    border: var(--border-ink);
    border-top: none;
    box-shadow: var(--shadow-solid);
    padding: 12px 20px;
    border-radius: 0 0 16px 16px;
    font-weight: 700;
    font-size: 1rem;
    margin-bottom: 30px;
    display: flex;
    align-items: center;
    gap: 10px;
}

/* Form Styles */
.water-neo-form { display: flex; flex-direction: column; gap: 20px; }
.water-form-grid { display: grid; grid-template-columns: 1fr 1fr; gap: 20px; }

.water-group { display: flex; flex-direction: column; gap: 8px; }
.water-group label { font-weight: 800; font-size: 1.05rem; }

.water-neo-wrapper input[type="number"],
.water-neo-wrapper select {
    width: 100%;
    padding: 14px;
    font-size: 1.1rem;
    font-weight: 700;
    border: var(--border-ink);
    border-radius: 12px;
    background: var(--bg-white);
    box-shadow: 4px 4px 0px #002855;
    outline: none;
    transition: all 0.2s;
}

.water-neo-wrapper input[type="number"]:focus,
.water-neo-wrapper select:focus {
    background: var(--clr-water-light);
    box-shadow: var(--shadow-solid);
}

/* Radio Giới tính */
.water-radio-grid { display: flex; gap: 15px; }
.water-radio-grid .radio-neo { flex: 1; cursor: pointer; }
.water-radio-grid input { display: none; }

.water-radio-grid .neo-content {
    display: block;
    text-align: center;
    padding: 14px;
    font-weight: 800;
    border: var(--border-ink);
    border-radius: 12px;
    background: var(--bg-white);
    box-shadow: 4px 4px 0px #002855;
    transition: all 0.15s;
}

.water-radio-grid input:checked + .neo-content {
    background: var(--clr-water-mid);
    box-shadow: var(--shadow-push);
    transform: translate(2px, 2px);
}

/* Button */
.water-neo-btn {
    padding: 18px;
    font-size: 1.3rem;
    font-weight: 900;
    background: var(--clr-water-neon);
    color: #fff;
    border: var(--border-ink);
    border-radius: 12px;
    box-shadow: var(--shadow-solid);
    cursor: pointer;
    text-transform: uppercase;
    transition: all 0.1s;
}

.water-neo-btn:hover { background: #0096c7; }
.water-neo-btn:active { box-shadow: var(--shadow-push); transform: translate(3px, 3px); }

/* Kết quả */
.water-neo-result {
    margin-top: 30px;
    padding-top: 30px;
    border-top: 3px dashed #002855;
}

.water-neo-result.active {
    display: block !important;
    animation: waterPop 0.6s cubic-bezier(0.175, 0.885, 0.32, 1.275) forwards;
}

.water-highlight {
    background: var(--clr-water-light);
    border: var(--border-ink);
    box-shadow: var(--shadow-solid);
    border-radius: 16px;
    padding: 30px 20px;
    text-align: center;
    margin-bottom: 25px;
}

.water-highlight h3 { margin: 0; font-size: 1.2rem; text-transform: uppercase; }
.water-total { font-size: 4rem; font-weight: 900; margin: 5px 0; color: var(--clr-water-neon); line-height: 1;}
.water-total small { font-size: 1.2rem; color: #002855;}
.water-liters { font-weight: 700; font-size: 1.1rem; }

/* Trực quan hóa Cốc Nước */
.water-glasses-box {
    background: #fff;
    border: var(--border-ink);
    box-shadow: var(--shadow-solid);
    border-radius: 12px;
    padding: 20px;
    margin-bottom: 25px;
    text-align: center;
}

.water-glasses-box h4 { margin: 0 0 10px 0; font-size: 1.1rem; }
.glasses-count { margin-bottom: 15px; font-weight: 700; }
.big-num { font-size: 2.5rem; font-weight: 900; color: var(--clr-water-neon); }

.glasses-visual {
    display: flex;
    flex-wrap: wrap;
    justify-content: center;
    gap: 5px;
    font-size: 1.8rem;
}

/* Bóc tách lý do */
.water-breakdown {
    background: #f8f9fa;
    border: var(--border-ink);
    border-radius: 12px;
    padding: 20px;
}

.water-breakdown h4 { margin: 0 0 15px 0; font-size: 1.1rem; }
.water-breakdown ul { margin: 0; padding-left: 20px; font-weight: 600; line-height: 1.6; }

@keyframes waterPop {
    0% { opacity: 0; transform: translateY(30px) scale(0.95); }
    100% { opacity: 1; transform: translateY(0) scale(1); }
}

@media (max-width: 500px) {
    .water-form-grid { grid-template-columns: 1fr; }
    .water-total { font-size: 3rem; }
}