@import url('https://fonts.googleapis.com/css2?family=Sarabun:wght@300;400;500;600;700&display=swap');

/* =========================================
   Base & Reset
========================================= */
* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

body {
    font-family: 'Sarabun', sans-serif;
    background: linear-gradient(135deg, #f0f4f8 0%, #d9e2ec 100%); /* พื้นหลังไล่สีอ่อนๆ */
    color: #334155;
    line-height: 1.6;
    min-height: 100vh;
    padding: 30px 15px;
}

/* =========================================
   Container & Cards
========================================= */
.container {
    max-width: 850px;
    margin: 0 auto;
    background: #ffffff;
    padding: 40px;
    border-radius: 16px;
    box-shadow: 0 10px 40px rgba(0, 0, 0, 0.08); /* เงานุ่มๆ ให้ดูมีมิติ */
}

h1, h2, h3 {
    color: #1e293b;
    font-weight: 600;
    margin-bottom: 15px;
}

h1 { font-size: 28px; }
h2 { font-size: 24px; }
h3 { font-size: 18px; margin-top: 25px; border-bottom: 2px solid #f1f5f9; padding-bottom: 10px; }

p { color: #64748b; }
hr { border: 0; height: 1px; background: #e2e8f0; margin: 30px 0; }

.text-center { text-align: center; }

/* =========================================
   Forms & Inputs
========================================= */
.form-group {
    margin-bottom: 20px;
}

.form-group label {
    display: block;
    margin-bottom: 8px;
    font-weight: 500;
    color: #475569;
}

.form-control {
    width: 100%;
    padding: 14px 16px;
    border: 1px solid #cbd5e1;
    border-radius: 8px;
    font-size: 16px;
    font-family: 'Sarabun', sans-serif;
    color: #334155;
    background-color: #fff;
    transition: all 0.3s ease;
}

/* เวลากดคลิกที่ช่องกรอกข้อมูล (Focus) */
.form-control:focus {
    border-color: #3b82f6;
    box-shadow: 0 0 0 4px rgba(59, 130, 246, 0.15);
    outline: none;
}

.form-control[readonly] {
    background-color: #f8fafc !important;
    color: #94a3b8;
    cursor: not-allowed;
    border-color: #e2e8f0;
}

textarea.form-control {
    resize: vertical;
    min-height: 100px;
}

/* =========================================
   Buttons
========================================= */
.btn {
    display: inline-flex;
    justify-content: center;
    align-items: center;
    padding: 14px 28px;
    border-radius: 8px;
    font-size: 16px;
    font-weight: 600;
    cursor: pointer;
    transition: all 0.2s ease;
    border: none;
    text-decoration: none;
    color: white;
}

.btn-block {
    display: flex;
    width: 100%;
    margin-bottom: 15px;
}

/* ปุ่มสีน้ำเงิน (ค่าเริ่มต้น / สำหรับนักเรียน) */
.btn {
    background-color: #2563eb;
    box-shadow: 0 4px 6px rgba(37, 99, 235, 0.2);
}
.btn:hover {
    background-color: #1d4ed8;
    transform: translateY(-2px);
    box-shadow: 0 6px 12px rgba(37, 99, 235, 0.3);
}

/* ปุ่มสีเขียว (สำหรับผู้ปกครอง / ปุ่ม Submit) */
.btn-success {
    background-color: #10b981 !important;
    box-shadow: 0 4px 6px rgba(16, 185, 129, 0.2) !important;
}
.btn-success:hover {
    background-color: #059669 !important;
    transform: translateY(-2px);
    box-shadow: 0 6px 12px rgba(16, 185, 129, 0.3) !important;
}

/* ปุ่มกลับ / ยกเลิก */
a.btn[style*="background:#6c757d"] {
    background-color: #64748b !important;
    box-shadow: none !important;
}
a.btn[style*="background:#6c757d"]:hover {
    background-color: #475569 !important;
}

/* =========================================
   Table (Survey)
========================================= */
.table-responsive {
    overflow-x: auto;
    border-radius: 10px;
    border: 1px solid #e2e8f0;
    margin-bottom: 30px;
}

table {
    width: 100%;
    border-collapse: collapse;
    background: #fff;
    min-width: 600px; /* ป้องกันตารางบีบจนเละบนมือถือ */
}

th, td {
    padding: 16px;
    border-bottom: 1px solid #e2e8f0;
    text-align: center;
    vertical-align: middle;
}

th {
    background-color: #f8fafc;
    color: #475569;
    font-weight: 600;
    position: sticky;
    top: 0;
}

td.text-left {
    text-align: left;
    color: #334155;
    line-height: 1.5;
}

/* สีหัวข้อแต่ละด้าน (A, B, C, D) */
th[colspan="6"] {
    background-color: #eff6ff !important;
    color: #1d4ed8 !important;
    font-size: 16px;
}

tbody tr:hover {
    background-color: #f8fafc;
}

/* ปรับ Radio Button ให้กดง่ายขึ้นบนมือถือ */
input[type="radio"] {
    width: 22px;
    height: 22px;
    accent-color: #2563eb; /* เปลี่ยนสี Radio เป็นสีน้ำเงิน */
    cursor: pointer;
    transition: transform 0.2s;
}
input[type="radio"]:hover {
    transform: scale(1.2);
}

/* =========================================
   Status Bar (แถบผู้ใช้งานด้านบน)
========================================= */
div[style*="background: #e9ecef"] {
    background-color: #f1f5f9 !important;
    border: 1px solid #e2e8f0;
    color: #475569;
    box-shadow: inset 0 2px 4px rgba(0,0,0,0.02);
}

/* =========================================
   Mobile Responsive Alerts
========================================= */
@media (max-width: 768px) {
    body { padding: 15px 10px; }
    
    .container {
        padding: 25px 20px;
        border-radius: 12px;
    }

    h1 { font-size: 24px; }
    h2 { font-size: 20px; }
    
    th, td { padding: 12px 10px; font-size: 14px; }
    
    .btn { padding: 12px 20px; font-size: 15px; }

    /* ปรับ Flex ให้ตกลงมาเรียงกันบนมือถือ */
    .form-group[style*="display: flex"] {
        flex-direction: column;
        gap: 10px;
    }
}