/* ==========================================================================
   1. Design Tokens (CSS Variables)
   รวบรวมจาก Prototype (test-*.php) ทั้งระบบเพื่อความสม่ำเสมอ
   ========================================================================== */
:root {
    /* Brand Colors (เพิ่มความทันสมัยจาก Prototype) */
    --primary: #0d6efd;
    --primary-hover: #0b5ed7;
    --success: #198754;
    --danger: #dc3545;
    --warning: #ffc107;
    --info: #0dcaf0;
    
    /* Legacy variables (เก็บไว้ชั่วคราวเผื่อมีบางหน้าเรียกใช้) */
    --primary-color: #0d6efd; 
    --text-color: #212529;
    --bg-color: #f4f6f9;
    --white: #ffffff;
    
    /* Structure & Backgrounds */
    --bg-body: #f4f6f9;
    --bg-card: #ffffff;
    --border: #dee2e6;
    
    /* Typography & Text */
    --text-main: #212529;
    --text-muted: #6c757d;
    --text-heading: #111111;
    --font-main: 'Sarabun', 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
    --font-heading: 'Noto Sans Thai', 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
    
    /* Link States Tokens */
    --link-primary: #0d6efd;
    --link-primary-hover: #0a58ca;
    --link-secondary: #6c757d;
    --link-secondary-hover: #5c636a;
    --link-success: #198754;
    --link-success-hover: #146c43;
    --link-danger: #dc3545;
    --link-danger-hover: #b02a37;
    --link-muted: #adb5bd;
    --link-muted-hover: #6c757d;
    
    /* UI Elements */
    --radius: 8px;
    --shadow-sm: 0 1px 2px rgba(0,0,0,0.05);
    --shadow-md: 0 4px 15px rgba(0,0,0,0.05);
}

/* ==========================================================================
   1.1 Fonts & @font-face Imports
   ========================================================================== */
/* โหลดฟอนต์ Noto Sans Thai สำหรับหัวเรื่อง (Headings) */
@font-face {
    font-family: 'Noto Sans Thai';
    src: url('/assets/fonts/NotoSansThai-SemiBold.woff2') format('woff2');
    font-weight: 600;
    font-style: normal;
    font-display: swap;
}
@font-face {
    font-family: 'Noto Sans Thai';
    src: url('/assets/fonts/NotoSansThai-Bold.woff2') format('woff2');
    font-weight: 700;
    font-style: normal;
    font-display: swap;
}

/* โหลดฟอนต์ Sarabun สำหรับข้อความพิเศษ และตัวเนื้อความ */
@font-face {
    font-family: 'Sarabun';
    src: url('/assets/fonts/Sarabun-Regular.woff2') format('woff2');
    font-weight: 400;
    font-style: normal;
    font-display: swap;
}
@font-face {
    font-family: 'Sarabun';
    src: url('/assets/fonts/Sarabun-Medium.woff2') format('woff2');
    font-weight: 500;
    font-style: normal;
    font-display: swap;
}
@font-face {
    font-family: 'Sarabun';
    src: url('/assets/fonts/Sarabun-SemiBold.woff2') format('woff2');
    font-weight: 600;
    font-style: normal;
    font-display: swap;
}
@font-face {
    font-family: 'Sarabun';
    src: url('/assets/fonts/Sarabun-Bold.woff2') format('woff2');
    font-weight: 700;
    font-style: normal;
    font-display: swap;
}

/* ==========================================================================
   2. Base & Reset
   ========================================================================== */
* {
    box-sizing: border-box;
}

body { 
    font-family: var(--font-main); 
    margin: 0; 
    padding: 0; 
    background-color: var(--bg-body); 
    color: var(--text-main); 
    line-height: 1.5;
}

h1, h2, h3, h4, h5, h6 { 
    font-family: var(--font-heading);
    margin-top: 0; 
    color: var(--text-heading); 
}

/* Base Link & State Classes */
a { 
    text-decoration: none; 
    color: var(--primary); 
    transition: color 0.2s ease, text-decoration 0.2s ease;
}

a:hover { 
    color: var(--primary-hover); 
}

/* ลิงก์โครงสร้างพื้นฐานที่มีเอฟเฟกต์ทรานซิชันสี */
.link-base {
    text-decoration: none;
    transition: color 0.2s ease-in-out, text-decoration 0.2s ease-in-out;
    font-family: var(--font-main);
}

/* ลิงก์สีหลักประจำแบรนด์ (สีน้ำเงิน) */
.link-primary { color: var(--link-primary); }
.link-primary:hover { color: var(--link-primary-hover); text-decoration: underline; }

/* ลิงก์สีรองสำหรับข้อความทั่วไป (สีเทา) */
.link-secondary { color: var(--link-secondary); }
.link-secondary:hover { color: var(--link-secondary-hover); text-decoration: underline; }

/* ลิงก์แสดงสถานะความสำเร็จเสร็จสิ้น (สีเขียว) */
.link-success { color: var(--link-success); }
.link-success:hover { color: var(--link-success-hover); text-decoration: underline; }

/* ลิงก์แสดงสถานะแจ้งเตือนข้อผิดพลาดล้มเหลว (สีแดง) */
.link-danger { color: var(--link-danger); }
.link-danger:hover { color: var(--link-danger-hover); text-decoration: underline; }

/* ลิงก์สีข้อความหม่นเบาบางเพื่อลดความเด่นลง */
.link-muted { color: var(--link-muted); }
.link-muted:hover { color: var(--link-muted-hover); text-decoration: underline; }

img {
    max-width: 100%;
    height: auto;
}

/* ==========================================================================
   3. Global Layouts & Utilities
   โครงสร้างหลักที่ทุกหน้าต้องใช้
   ========================================================================== */
.container { 
    max-width: 1140px; 
    margin: 0 auto; 
    padding: 20px; 
}

/* --- Legacy Layouts (รองรับโครงสร้างเก่า) --- */
header { 
    background: var(--bg-card); 
    border-bottom: 1px solid var(--border);
    color: var(--text-main); 
    padding: 15px 20px; 
}
nav a { 
    color: var(--text-main); 
    margin-right: 15px; 
}
nav a:hover { 
    color: var(--primary);
    text-decoration: none;
}
main { 
    padding: 20px; 
    max-width: 1140px; 
    margin: 0 auto; 
    background: transparent; 
    min-height: 80vh; 
}
footer { 
    text-align: center; 
    padding: 20px; 
    color: var(--text-muted);
    border-top: 1px solid var(--border);
}

/* --- Utilities --- */
.text-center { text-align: center; }
.text-danger { color: var(--danger); }
.text-success { color: var(--success); }
.text-muted { color: var(--text-muted); }

/* ==========================================================================
   4. Global Components (Buttons, Cards, Forms)
   ย้ายมาจาก test-buttons.php, test-cards.php, test-forms.php
   ========================================================================== */

/* --- Buttons --- */
.btn {
    display: inline-flex; align-items: center; justify-content: center;
    font-family: var(--font-main); font-weight: 600;
    padding: 0.5rem 1rem; font-size: 1rem; border-radius: 6px;
    border: 1px solid transparent; cursor: pointer; text-decoration: none;
    transition: all 0.2s ease-in-out; gap: 0.5rem;
}
.btn:disabled { opacity: 0.65; cursor: not-allowed; }

.btn-sm { padding: 0.25rem 0.5rem; font-size: 0.875rem; border-radius: 4px; }
.btn-lg { padding: 0.75rem 1.5rem; font-size: 1.25rem; border-radius: 8px; }

.btn-primary { background: var(--primary); color: #fff; }
.btn-primary:hover:not(:disabled) { background: var(--primary-hover); }
.btn-secondary { background: #6c757d; color: #fff; }
.btn-secondary:hover:not(:disabled) { background: #5c636a; }
.btn-success { background: var(--success); color: #fff; }
.btn-success:hover:not(:disabled) { background: #157347; }
.btn-danger { background: var(--danger); color: #fff; }
.btn-danger:hover:not(:disabled) { background: #bb2d3b; }
.btn-warning { background: var(--warning); color: #000; }
.btn-warning:hover:not(:disabled) { background: #ffca2c; }
.btn-info { background: var(--info); color: #000; }
.btn-info:hover:not(:disabled) { background: #31d2f2; }

.btn-outline-primary { background: transparent; border-color: var(--primary); color: var(--primary); }
.btn-outline-primary:hover:not(:disabled) { background: var(--primary); color: #fff; }

/* --- Cards --- */
.card {
    background-color: var(--bg-card);
    border: 1px solid var(--border);
    border-radius: var(--radius);
    overflow: hidden;
    box-shadow: var(--shadow-sm);
    display: flex;
    flex-direction: column;
    transition: transform 0.2s ease, box-shadow 0.2s ease;
    text-decoration: none;
    color: inherit;
}
.card:hover {
    transform: translateY(-4px);
    box-shadow: var(--shadow-md);
}
.card-body {
    padding: 1.25rem;
    flex-grow: 1;
    display: flex;
    flex-direction: column;
}
.card-footer {
    padding: 0.75rem 1.25rem;
    background-color: #f8f9fa;
    border-top: 1px solid var(--border);
    font-size: 0.75rem;
    color: var(--text-muted);
    display: flex;
    justify-content: space-between;
    align-items: center;
}
.card-title {
    font-weight: 600;
    font-size: 1.1rem;
    margin-top: 0;
    margin-bottom: 0.5rem;
    color: var(--text-main);
    line-height: 1.4;
}
.card-text {
    font-size: 0.85rem;
    color: var(--text-muted);
    margin-bottom: 1rem;
    line-height: 1.6;
    flex-grow: 1;
}

/* --- Forms --- */
.form-group {
    margin-bottom: 1.5rem;
}
.form-label {
    display: inline-block;
    margin-bottom: 0.5rem;
    font-weight: 600;
    font-size: 0.95rem;
    color: var(--text-main);
}
.form-control, 
.form-select {
    display: block;
    width: 100%;
    padding: 0.5rem 0.75rem;
    font-family: inherit;
    font-size: 0.85rem;
    color: var(--text-main);
    background-color: #ffffff;
    background-clip: padding-box;
    border: 1px solid var(--border);
    border-radius: 4px;
    transition: border-color .15s ease-in-out, box-shadow .15s ease-in-out;
    box-sizing: border-box;
}
.form-control:focus,
.form-select:focus {
    outline: 0;
    border-color: #86b7fe;
    box-shadow: 0 0 0 0.25rem rgba(13, 110, 253, 0.25);
}
.form-control::placeholder {
    color: var(--text-muted);
    opacity: 1;
}
.form-check {
    display: flex;
    align-items: center;
    margin-bottom: 0.5rem;
}
.form-check-input {
    margin-right: 0.5rem;
    width: 1rem;
    height: 1rem;
    cursor: pointer;
}
.form-check-label {
    font-size: 0.85rem;
    color: var(--text-main);
    cursor: pointer;
    user-select: none;
}