:root {
    --color-blue: #0F4C81;
    --color-blue-dark: #0A3256;
    --color-blue-light: #EBF4FC;
    --color-orange: #FF7A00;
    --color-orange-dark: #D96800;
    --color-orange-light: #FFF2E6;
    
    --bg-gradient: linear-gradient(135deg, #0B1E33 0%, #0F4C81 50%, #FF7A00 100%);
    --text-main: #1E293B;
    --text-muted: #64748B;
    --danger: #EF4444;
    --success: #10B981;
    
    --font-display: 'Kanit', sans-serif;
    --font-body: 'Sarabun', sans-serif;
}

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

body {
    font-family: var(--font-body);
    background: var(--bg-gradient);
    min-height: 100vh;
    display: flex;
    align-items: center;
    justify-content: center;
    padding: 20px;
    overflow: hidden;
    position: relative;
}

/* เอฟเฟกต์แสงพื้นหลัง */
body::before {
    content: '';
    position: absolute;
    width: 400px;
    height: 400px;
    background: rgba(255, 122, 0, 0.15);
    border-radius: 50%;
    top: -100px;
    right: -100px;
    filter: blur(80px);
    z-index: 1;
}

body::after {
    content: '';
    position: absolute;
    width: 450px;
    height: 450px;
    background: rgba(15, 76, 129, 0.3);
    border-radius: 50%;
    bottom: -150px;
    left: -150px;
    filter: blur(100px);
    z-index: 1;
}

/* การ์ดแก้วพรีเมียม (Glassmorphism) */
.login-card {
    background: rgba(255, 255, 255, 0.9);
    backdrop-filter: blur(12px);
    border: 1px solid rgba(255, 255, 255, 0.25);
    border-radius: 24px;
    padding: 40px 32px;
    width: 100%;
    max-width: 420px;
    box-shadow: 0 20px 40px rgba(0, 0, 0, 0.25);
    z-index: 10;
    text-align: center;
    animation: cardAppear 0.5s cubic-bezier(0.16, 1, 0.3, 1) forwards;
}

@keyframes cardAppear {
    from { opacity: 0; transform: translateY(30px) scale(0.95); }
    to { opacity: 1; transform: translateY(0) scale(1); }
}

.login-logo {
    width: 64px;
    height: 64px;
    background-color: var(--color-blue-light);
    color: var(--color-blue);
    border-radius: 50%;
    display: inline-flex;
    align-items: center;
    justify-content: center;
    margin-bottom: 20px;
    border: 2px solid rgba(15, 76, 129, 0.2);
    box-shadow: 0 8px 16px rgba(15, 76, 129, 0.1);
}

.login-header h1 {
    font-family: var(--font-display);
    font-size: 20px;
    font-weight: 600;
    color: var(--color-blue);
    margin-bottom: 6px;
}

.login-header p {
    font-size: 13px;
    color: var(--text-muted);
    margin-bottom: 30px;
}

/* ฟอร์มและอินพุต */
.form-group {
    margin-bottom: 20px;
    text-align: left;
    position: relative;
}

.form-group label {
    font-size: 13px;
    font-weight: 500;
    color: var(--text-main);
    margin-bottom: 8px;
    display: block;
}

.input-wrapper {
    position: relative;
    display: flex;
    align-items: center;
}

.input-icon {
    position: absolute;
    left: 14px;
    color: var(--text-muted);
    pointer-events: none;
    transition: color 0.2s;
}

.form-control {
    width: 100%;
    padding: 12px 14px 12px 42px;
    border-radius: 10px;
    border: 1px solid #CBD5E1;
    background-color: #FFFFFF;
    color: var(--text-main);
    font-size: 14px;
    outline: none;
    transition: all 0.2s ease;
}

.form-control:focus {
    border-color: var(--color-orange);
    box-shadow: 0 0 0 3px var(--color-orange-light);
}

.form-control:focus + .input-icon {
    color: var(--color-orange);
}

/* ปุ่มกด */
.btn-login {
    width: 100%;
    padding: 12px;
    border-radius: 10px;
    border: none;
    background-color: var(--color-blue);
    color: #FFFFFF;
    font-family: var(--font-display);
    font-size: 15px;
    font-weight: 500;
    cursor: pointer;
    transition: all 0.2s ease;
    box-shadow: 0 4px 12px rgba(15, 76, 129, 0.2);
    margin-top: 10px;
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 8px;
}

.btn-login:hover {
    background-color: var(--color-blue-dark);
    transform: translateY(-1px);
    box-shadow: 0 6px 16px rgba(15, 76, 129, 0.3);
}

.btn-back {
    display: inline-flex;
    align-items: center;
    gap: 6px;
    margin-top: 24px;
    font-size: 13px;
    color: var(--color-orange-dark);
    text-decoration: none;
    font-weight: 500;
    transition: color 0.2s;
}

.btn-back:hover {
    color: var(--color-orange);
}

/* กล่องแจ้งเตือนภัยคุกคาม */
.alert-box {
    background-color: #FEE2E2;
    border: 1px solid #FCA5A5;
    color: var(--danger);
    padding: 10px 14px;
    border-radius: 8px;
    font-size: 13px;
    margin-bottom: 20px;
    display: none;
    align-items: center;
    gap: 8px;
    text-align: left;
    animation: shake 0.3s ease-in-out;
}

@keyframes shake {
    0%, 100% { transform: translateX(0); }
    25% { transform: translateX(-4px); }
    75% { transform: translateX(4px); }
}