html, body { height: 100%; }
body { font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif; background: #f4f7f6; margin: 0; padding: 0; }
.container { max-width: 600px; margin: auto; background: white; padding: 30px; border-radius: 8px; box-shadow: 0 2px 10px rgba(0,0,0,0.1); }
h1 { color: #2c3e50; text-align: center; }
/* Thông tin bác sĩ dưới tiêu đề */
.doctor-info {
    color: #b22222; /* đỏ đậm nhưng dịu mắt (firebrick) */
    font-weight: 500;
    text-align: center;
    margin: 1px 0 1px;
    font-size: 1.5rem; /* tăng gấp đôi so với 0.95rem */
}
.section { margin-bottom: 2px; padding: 2px 0; border-bottom: 1px solid #eee; }
label { display: block; font-weight: bold; margin-bottom: 2px; margin-top: 2px; }
select, input[type="number"] { width: 100%; padding: 10px; border: 1px solid #ddd; border-radius: 4px; }
.toggle-area { background: #e8f4fd; border-radius: 5px; display: flex; align-items: center; justify-content: space-between; padding: 8px; }
/* Stay days button group */
.stay-days { display: flex; gap: 8px; margin-top: 8px; margin-bottom: 8px; }
.stay-btn { flex: 1; padding: 10px 8px; border: 2px solid #ddd; background: #fff; border-radius: 6px; cursor: pointer; font-weight: 600; font-size: 0.9rem; transition: all 0.2s; }
.stay-btn:hover { border-color: #3498db; background: #f0f8ff; }
.stay-btn.active { background: #3498db; color: white; border-color: #3498db; }
/* BHYT button */
.bhyt-btn { width: 100%; padding: 12px 10px; border: 2px solid #ddd; background: #fff; border-radius: 6px; cursor: pointer; font-weight: 600; font-size: 0.95rem; transition: all 0.2s; margin-top: 10px; }
.bhyt-btn:hover { border-color: #27ae60; background: #f0f8ff; }
.bhyt-btn.active { background: #27ae60; color: white; border-color: #27ae60; }
/* Other services button group */
#otherServices { display: grid; grid-template-columns: 1fr 1fr; gap: 6px; margin-top: 6px; }
.other-btn { padding: 10px 8px; border: 2px solid #ddd; background: #fff; border-radius: 6px; cursor: pointer; font-weight: 500; font-size: 0.85rem; transition: all 0.2s; text-align: left; }
.other-btn:hover { border-color: #3498db; background: #f0f8ff; }
.other-btn.active { background: #3498db; color: white; border-color: #3498db; }
.price-detail { margin-top: 5px; padding: 5px 8px; background: #f0f8ff; border-left: 4px solid #3498db; font-size: 0.9em; color: #2c3e50; }
.price-detail span { font-weight: bold; color: #e74c3c; }
.total-display { text-align: center; background: #27ae60; color: white; padding: 14px 8px; border-radius: 8px; margin-top: 10px; width: 90%; margin-left: auto; margin-right: auto; display: flex; justify-content: center; align-items: center; gap: 10px; }
#finalAmount { font-size: 1.6em; font-weight: bold; margin: 0; }
.total-display h2 { font-size: 1.5em; margin: 0; }
/* Tối ưu cho màn hình điện thoại */
@media (max-width: 480px) {
    /* Edge-to-edge on small screens */
    .container {
        padding: 15px;
        margin: 1px;
        width: 100%;
        max-width: 100%;
        border-radius: 0;
        box-shadow: none;
        /* account for iPhone notch / safe area */
        padding-left: env(safe-area-inset-left);
        padding-right: env(safe-area-inset-right);
    }

    h1 { font-size: 1.5rem; }

    /* Làm các ô chọn to ra để dễ bấm bằng tay */
    select, input[type="number"] {
        height: 50px; 
        font-size: 16px; /* Tránh bị zoom trên iPhone khi bấm vào */
    }

    /* Biến danh sách checkbox thành các hàng lớn dễ tích */
    #otherServices div {
        background: #f9f9f9;
        padding: 12px;
        margin-bottom: 8px;
        border-radius: 6px;
        display: flex;
        align-items: center;
    }

    input[type="checkbox"] {
        width: 22px;
        height: 22px;
        margin-right: 12px;
    }

    /* Cố định tổng tiền ở dưới cùng màn hình (Sticky Footer) */
    .total-display {
        position: sticky;
        bottom: 0;
        left: 0;
        right: 0;
        margin-top: 30px;
        box-shadow: 0 -5px 15px rgba(0,0,0,0.1);
    }
}

/* Homepage styles */
.homepage-header {
    background: linear-gradient(135deg, #4CAF50, #2e7d32);
    color: white;
    text-align: center;
    padding: 2.5rem 1rem;
}

.homepage-header h1 {
    font-size: 2rem;
    margin-bottom: 0.5rem;
}

.homepage-header p {
    margin: 0.4rem 0;
    color: rgba(255, 255, 255, 0.95);
}

.subtitle {
    font-size: 1rem;
    opacity: 0.9;
}

.week {
    background: #c8e6c9;
    margin: 1rem;
    padding: 1.2rem;
    border-radius: 16px;
    text-align: center;
    font-weight: bold;
    color: #1b5e20;
    box-shadow: inset 0 2px 6px rgba(0,0,0,0.08);
}

.features {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(220px, 1fr));
    gap: 1rem;
    padding: 1rem;
    max-width: 1200px;
    margin: 0 auto;
}

.card {
    background: white;
    padding: 1.5rem;
    border-radius: 18px;
    box-shadow: 0 10px 24px rgba(0,0,0,0.08);
    text-align: center;
    transition: transform 0.25s ease, box-shadow 0.25s ease;
}

.card-link {
    display: block;
    color: inherit;
    text-decoration: none;
}

.card i {
    font-size: 2rem;
    color: #4CAF50;
    margin-bottom: 0.7rem;
}

.card h3 {
    margin-bottom: 0.5rem;
    font-size: 1.1rem;
}

.card p {
    color: #555;
    line-height: 1.5;
}

.card:hover {
    transform: translateY(-6px);
    box-shadow: 0 14px 30px rgba(0,0,0,0.12);
}

.advice {
    max-width: 720px;
    margin: 2rem auto;
    background: white;
    border-left: 5px solid #4CAF50;
    padding: 1.4rem 1.6rem;
    border-radius: 16px;
    box-shadow: 0 10px 24px rgba(0,0,0,0.08);
    font-style: italic;
}

.advice blockquote {
    margin: 0;
    font-size: 1.1rem;
    color: #1b5e20;
}

.advice cite {
    display: block;
    margin-top: 0.75rem;
    text-align: right;
    color: #555;
}

.homepage-footer {
    position: fixed;
    bottom: 0;
    left: 0;
    width: 100%;
    background: #4CAF50;
    padding: 0.9rem 0;
    border-top-left-radius: 16px;
    border-top-right-radius: 16px;
    box-shadow: 0 -4px 12px rgba(0,0,0,0.15);
}

.homepage-footer nav {
    display: flex;
    justify-content: space-around;
    max-width: 720px;
    margin: auto;
}

.homepage-footer nav a {
    color: white;
    text-decoration: none;
    display: flex;
    flex-direction: column;
    align-items: center;
    font-size: 0.85rem;
}

.homepage-footer nav a i {
    margin-bottom: 0.2rem;
}

.back-link {
    margin-bottom: 16px;
}

.back-link a {
    color: #3498db;
    text-decoration: none;
    font-weight: 600;
}

@media (min-width: 768px) {
    .homepage-footer nav {
        width: 90%;
        margin: 0 auto;
    }
}