/* =========================================
   Variables & Reset
========================================= */
:root {
    /* โทนสีเขียวเข้ม Modern */
    --bg-primary: #0a1f13;     /* สีพื้นหลังเขียวเข้มมาก */
    --bg-secondary: #122b1e;   /* สีพื้นหลังการ์ด */
    --accent-color: #2ecc71;   /* สีเขียวสว่าง (Emerald) สำหรับจุดเด่น */
    --accent-hover: #27ae60;   /* สีเขียวตอนเอาเมาส์ชี้ */
    --text-light: #ffffff;     /* สีข้อความหลัก */
    --text-muted: #aabbae;     /* สีข้อความรอง */
    --input-bg: #1a3828;       /* สีพื้นหลังช่อง Input */
    --danger-color: #e74c3c;

    --font-main: 'Prompt', sans-serif;
    --border-radius: 12px;
}

* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

body {
    font-family: var(--font-main);
    background-color: var(--bg-primary);
    /* สร้าง Gradient พื้นหลังแบบละเอียด */
    background: url(../img/bg.webp);
    background-position: top center;
    background-repeat: no-repeat;
    background-color: #000000;
    color: var(--text-light);
    min-height: 100vh;
    display: flex;
    justify-content: center;
    align-items: center;
    background-size: cover;
    padding: 20px;
}

/* =========================================
   Layout
========================================= */
.login-wrapper { width: 100%; max-width: 420px; display: flex; flex-direction: column; align-items: center; }
.login-container { width: 100%; }
.login-logo { text-align: center; margin-bottom: 30px; }
.login-logo img { max-width: 220px; height: auto; filter: drop-shadow(0 4px 6px rgba(0,0,0,0.3)); }

.login-box {
    background-color: var(--bg-secondary);
    padding: 40px 30px;
    border-radius: var(--border-radius);
    box-shadow: 0 10px 30px rgba(0, 0, 0, 0.4);
    border: 1px solid rgba(255, 255, 255, 0.05);
}

h2 { text-align: center; font-size: 28px; font-weight: 600; margin-bottom: 10px; color: var(--text-light); }
.sub-text { text-align: center; color: var(--text-muted); margin-bottom: 30px; font-size: 14px; }

/* =========================================
   Inputs & Password Toggle
========================================= */
.input-group {
    position: relative;
    margin-bottom: 20px;
    border-radius: var(--border-radius);
    background-color: var(--input-bg);
    border: 2px solid transparent;
    transition: all 0.3s ease;
}
.input-group.focused { border-color: var(--accent-color); box-shadow: 0 0 10px rgba(46, 204, 113, 0.2); }

.input-group input {
    width: 100%;
    /* เพิ่ม padding ขวา 45px เพื่อไม่ให้ทับไอคอนลูกตา */
    padding: 15px 45px 15px 50px; 
    background: none;
    border: none;
    color: var(--text-light);
    font-size: 16px;
    font-family: var(--font-main);
    outline: none;
}

.input-icon {
    position: absolute;
    left: 15px;
    top: 50%;
    transform: translateY(-50%);
    color: var(--text-muted);
    font-size: 18px;
    transition: color 0.3s ease;
}
.input-group.focused .input-icon { color: var(--accent-color); }

/* ปุ่มลูกตา */
.toggle-password {
    position: absolute;
    right: 15px;
    top: 50%;
    transform: translateY(-50%);
    color: var(--text-muted);
    cursor: pointer;
    font-size: 16px;
    transition: color 0.2s;
    z-index: 10;
}
.toggle-password:hover { color: var(--text-light); }

/* =========================================
   Remember Me Checkbox (Custom Style)
========================================= */
.options-group {
    margin-bottom: 25px;
    display: flex;
    align-items: center;
}

.custom-checkbox {
    display: block;
    position: relative;
    padding-left: 30px;
    cursor: pointer;
    font-size: 14px;
    color: var(--text-muted);
    user-select: none;
}

.custom-checkbox input { position: absolute; opacity: 0; cursor: pointer; height: 0; width: 0; }

/* สร้างกล่องสี่เหลี่ยมเอง */
.checkmark {
    position: absolute;
    top: 0;
    left: 0;
    height: 20px;
    width: 20px;
    background-color: var(--input-bg);
    border-radius: 5px;
    border: 1px solid rgba(255,255,255,0.1);
    transition: all 0.2s;
}

/* เมื่อเอาเมาส์ชี้ */
.custom-checkbox:hover input ~ .checkmark { background-color: #244b36; }

/* เมื่อติ๊กถูก */
.custom-checkbox input:checked ~ .checkmark {
    background-color: var(--accent-color);
    border-color: var(--accent-color);
}

/* เครื่องหมายถูก (Hidden by default) */
.checkmark:after { content: ""; position: absolute; display: none; }
.custom-checkbox input:checked ~ .checkmark:after { display: block; }

/* วาดเครื่องหมายถูก */
.custom-checkbox .checkmark:after {
    left: 7px;
    top: 3px;
    width: 5px;
    height: 10px;
    border: solid white;
    border-width: 0 2px 2px 0;
    transform: rotate(45deg);
}

/* =========================================
   Buttons & Footer
========================================= */
.btn-login {
    width: 100%;
    padding: 15px;
    background-color: var(--accent-color);
    color: white;
    border: none;
    border-radius: var(--border-radius);
    font-size: 18px;
    font-weight: 600;
    font-family: var(--font-main);
    cursor: pointer;
    transition: all 0.3s ease;
    display: flex;
    justify-content: center;
    align-items: center;
    gap: 10px;
}
.btn-login:hover {
    background-color: var(--accent-hover);
    transform: translateY(-2px);
    box-shadow: 0 5px 15px rgba(46, 204, 113, 0.3);
}
.btn-login:active { transform: translateY(0); }

/* Placeholder Styling */
::-webkit-input-placeholder { color: rgba(170, 187, 174, 0.6); }
::-moz-placeholder { color: rgba(170, 187, 174, 0.6); }
:-ms-input-placeholder { color: rgba(170, 187, 174, 0.6); }

/* Footer Animation */
.footer-link { margin-top: 40px; text-align: center; opacity: 0.8; transition: opacity 0.3s ease; }
.footer-link:hover { opacity: 1; }
.footer-link img { max-width: 120px; height: auto; }

@keyframes fadeDown { from { opacity: 0; transform: translateY(-20px); } to { opacity: 1; transform: translateY(0); } }
@keyframes fadeUp { from { opacity: 0; transform: translateY(20px); } to { opacity: 1; transform: translateY(0); } }
.animate-fade-down { animation: fadeDown 0.8s ease-out; }
.animate-fade-up { animation: fadeUp 0.8s ease-out 0.2s both; }

@media (max-width: 480px) {
    .login-box { padding: 30px 20px; }
    h2 { font-size: 24px; }
}