:root {
    --login-navy: #14284b;
    --login-navy-deep: #0d1d38;
    --login-yellow: #ffdf00;
    --login-page: #edf2f8;
    --login-text: #17233a;
    --login-muted: #66738a;
    --login-border: #cbd6e5;
    --login-danger: #b93648;
}

* { box-sizing: border-box; }

body {
    min-height: 100vh;
    margin: 0;
    color: var(--login-text);
    background:
        radial-gradient(circle at 8% 12%, rgba(255, 223, 0, .22), transparent 28rem),
        linear-gradient(135deg, #f5f8fc 0%, var(--login-page) 52%, #dfe8f4 100%);
    font-family: 'Sarabun', Tahoma, sans-serif;
}

.login-page {
    display: grid;
    min-height: 100vh;
    place-items: center;
    padding: 2rem;
}

.login-card {
    display: grid;
    grid-template-columns: minmax(285px, .92fr) minmax(355px, 1.08fr);
    width: min(950px, 100%);
    min-height: 550px;
    overflow: hidden;
    background: #fff;
    border: 1px solid rgba(20, 40, 75, .12);
    border-radius: 18px;
    box-shadow: 0 24px 60px rgba(23, 43, 77, .18);
}

.login-intro {
    position: relative;
    display: flex;
    flex-direction: column;
    align-items: flex-start;
    justify-content: center;
    overflow: hidden;
    padding: 3rem;
    color: #fff;
    background: linear-gradient(155deg, var(--login-navy) 0%, #203e70 100%);
}

.login-intro::after {
    position: absolute;
    width: 290px;
    height: 290px;
    right: -148px;
    bottom: -150px;
    border: 42px solid rgba(255, 223, 0, .9);
    border-radius: 50%;
    content: '';
}

.login-intro > * { position: relative; z-index: 1; }

.login-intro-mark {
    display: grid;
    width: 82px;
    height: 82px;
    place-items: center;
    margin-bottom: 2.4rem;
    border-radius: 16px;
    background: var(--login-yellow);
    box-shadow: 0 12px 22px rgba(0, 0, 0, .18);
}

.login-intro-mark img {
    width: 64px;
    height: 64px;
    object-fit: contain;
}

.login-kicker {
    margin: 0 0 .55rem;
    color: #dbe7fb;
    font-size: .88rem;
    font-weight: 600;
    letter-spacing: .06em;
}

.login-intro h1 {
    margin: 0;
    color: #fff;
    font-size: clamp(1.75rem, 2.45vw, 2.25rem);
    line-height: 1.25;
}

.login-intro-copy {
    max-width: 290px;
    margin: 1.2rem 0 0;
    color: #dce7f7;
    font-size: 1rem;
    line-height: 1.7;
}

.login-panel {
    display: flex;
    flex-direction: column;
    justify-content: center;
    padding: 3.8rem clamp(2rem, 6vw, 5.2rem);
}

.login-panel-heading { margin-bottom: 1.8rem; }

.login-panel-icon {
    display: grid;
    width: 42px;
    height: 42px;
    place-items: center;
    margin-bottom: 1.2rem;
    color: var(--login-navy);
    border-radius: 12px;
    background: #e6eef9;
    font-size: 1.75rem;
    font-weight: 700;
}

.login-panel h2 {
    margin: 0;
    color: var(--login-navy);
    font-size: 1.75rem;
}

.login-panel-heading p,
.login-notice {
    color: var(--login-muted);
    font-size: .94rem;
    line-height: 1.55;
}

.login-panel-heading p { margin: .4rem 0 0; }

.login-alert {
    margin: 0 0 1.25rem;
    padding: .75rem .9rem;
    color: #8f2030;
    border-left: 4px solid var(--login-danger);
    border-radius: 6px;
    background: #fff0f2;
    font-size: .95rem;
}

.login-form { width: 100%; }

.login-field { margin-bottom: 1.15rem; }

.login-field label {
    display: block;
    margin: 0 0 .45rem;
    color: #263858;
    font-size: .95rem;
    font-weight: 600;
}

.login-field input {
    width: 100%;
    min-height: 48px;
    padding: .7rem .85rem;
    color: var(--login-text);
    border: 1px solid var(--login-border);
    border-radius: 8px;
    outline: none;
    background: #fff;
    box-shadow: none;
    font: inherit;
    transition: border-color .16s ease, box-shadow .16s ease;
}

.login-field input::placeholder { color: #98a4b5; }

.login-field input:focus {
    border-color: #3569a9;
    box-shadow: 0 0 0 3px rgba(53, 105, 169, .16);
}

.remember-toggle {
    display: inline-flex;
    align-items: center;
    gap: .68rem;
    margin: .05rem 0 1.55rem;
    color: #465671;
    cursor: pointer;
    font-size: .92rem;
    user-select: none;
}

.remember-toggle input {
    position: absolute;
    width: 1px;
    height: 1px;
    opacity: 0;
}

.remember-track {
    display: inline-flex;
    align-items: center;
    width: 42px;
    height: 24px;
    padding: 3px;
    border-radius: 999px;
    background: #b6c1d0;
    transition: background .16s ease;
}

.remember-knob {
    width: 18px;
    height: 18px;
    border-radius: 50%;
    background: #fff;
    box-shadow: 0 1px 3px rgba(0, 0, 0, .25);
    transition: transform .16s ease;
}

.remember-toggle input:checked + .remember-track { background: #1f5a99; }
.remember-toggle input:checked + .remember-track .remember-knob { transform: translateX(18px); }
.remember-toggle input:focus-visible + .remember-track { outline: 3px solid rgba(53, 105, 169, .36); outline-offset: 2px; }

.login-submit {
    display: inline-flex;
    width: 100%;
    min-height: 50px;
    align-items: center;
    justify-content: center;
    gap: .55rem;
    color: #112341;
    border: 1px solid #dfc400;
    border-radius: 8px;
    background: var(--login-yellow);
    box-shadow: 0 8px 16px rgba(197, 166, 0, .2);
    cursor: pointer;
    font: inherit;
    font-weight: 700;
    transition: transform .16s ease, background .16s ease, box-shadow .16s ease;
}

.login-submit:hover { background: #f4d500; box-shadow: 0 10px 20px rgba(197, 166, 0, .28); transform: translateY(-1px); }
.login-submit:focus-visible { outline: 3px solid rgba(53, 105, 169, .42); outline-offset: 3px; }

.login-notice { margin: 1.6rem 0 0; text-align: center; }

@media (max-width: 720px) {
    .login-page { padding: 1rem; }
    .login-card { grid-template-columns: 1fr; min-height: 0; border-radius: 14px; }
    .login-intro { min-height: 235px; padding: 2rem; }
    .login-intro-mark { width: 60px; height: 60px; margin-bottom: 1.25rem; border-radius: 12px; }
    .login-intro-mark img { width: 47px; height: 47px; }
    .login-intro-copy { display: none; }
    .login-intro::after { width: 210px; height: 210px; right: -115px; bottom: -130px; border-width: 30px; }
    .login-panel { padding: 2rem; }
}

@media (max-width: 390px) {
    .login-panel { padding: 1.7rem 1.35rem; }
    .remember-toggle { align-items: flex-start; }
}