/* Login: black stage, orange-lit frame, abstract light art */
@import url('https://fonts.googleapis.com/css2?family=IBM+Plex+Sans+Thai:wght@400;500;600&display=swap');

:root {
    --black: #0a0909;
    --ember: #ff6a1a;
    --ember-hot: #ff8a3d;
    --ink: #121010;
    --muted: #5d5753;
    --line: #d9d3cf;
}

* { box-sizing: border-box; }
html, body { height: 100%; }

body.login-page {
    margin: 0;
    min-height: 100vh;
    display: flex;
    align-items: center;
    justify-content: center;
    padding: 28px;
    background: var(--black);
    font-family: 'IBM Plex Sans Thai', system-ui, sans-serif;
    color: var(--ink);
}

/* backdrop light: two layers that trade places, in step with the frame */
body.login-page::before,
body.login-page::after {
    content: "";
    position: fixed;
    inset: 0;
    pointer-events: none;
    z-index: 0;
}
body.login-page::before {
    background:
        radial-gradient(60% 50% at 8% 0%, rgba(255, 90, 0, .34), transparent 70%),
        radial-gradient(55% 45% at 100% 100%, rgba(220, 50, 0, .34), transparent 70%);
    animation: backdrop-ember 7s ease-in-out infinite;
}
body.login-page::after {
    background:
        radial-gradient(60% 50% at 8% 0%, rgba(124, 58, 237, .38), transparent 70%),
        radial-gradient(55% 45% at 100% 100%, rgba(106, 47, 240, .36), transparent 70%);
    animation: backdrop-violet 7s ease-in-out infinite;
}
@keyframes backdrop-ember  { 0%, 100% { opacity: 1; } 50% { opacity: 0; } }
@keyframes backdrop-violet { 0%, 100% { opacity: 0; } 50% { opacity: 1; } }
@media (prefers-reduced-motion: reduce) {
    body.login-page::before { animation: none; }
    body.login-page::after { display: none; }
}
::selection { background: var(--ember); color: #000; }

.stage {
    position: relative;
    z-index: 1;
    width: 100%;
    max-width: 1000px;
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 0;
    padding: 10px;
    background: #fff;
    border-radius: 30px;
    border: 2px solid var(--ember);
    box-shadow:
        0 0 18px rgba(255, 106, 26, .65),
        0 0 70px rgba(255, 90, 0, .32),
        0 24px 60px rgba(0, 0, 0, .55);
}

/* ---- art panel ---- */
.art {
    position: relative;
    min-height: 600px;
    border-radius: 22px;
    overflow: hidden;
    background: #0b0809;
    isolation: isolate;
}
.art svg { position: absolute; inset: 0; width: 100%; height: 100%; }
.art .drift { animation: drift 16s ease-in-out infinite alternate; transform-origin: center; }
@keyframes drift {
    from { transform: translate3d(0, 0, 0) scale(1); }
    to   { transform: translate3d(-14px, -22px, 0) scale(1.04); }
}
.art .mark {
    position: absolute;
    top: 34px;
    left: 50%;
    width: 54px;
    height: 54px;
    transform: translateX(-50%);
    filter: drop-shadow(0 0 14px rgba(139, 92, 246, .55));
    z-index: 2;
}

/* ---- form side ---- */
.panel { display: flex; align-items: center; padding: 48px clamp(28px, 5vw, 56px); }
.panel form { width: 100%; max-width: 360px; margin: 0 auto; }
.panel h1 { font-size: 44px; font-weight: 500; line-height: 1.1; margin: 0 0 .5rem; letter-spacing: -.01em; }
.panel .sub { margin: 0 0 2rem; color: var(--muted); font-size: 15px; }

.field { margin-bottom: 1.1rem; }
.field label { display: block; font-size: 14px; font-weight: 500; margin-bottom: .4rem; }
.input-wrap { position: relative; }
.input-wrap input {
    width: 100%;
    height: 48px;
    padding: 0 1.2rem;
    font: inherit;
    color: var(--ink);
    background: #fff;
    border: 1px solid #8f8782;
    border-radius: 999px;
    transition: border-color .15s, box-shadow .15s;
}
.input-wrap input:focus { outline: none; border-color: var(--ember); box-shadow: 0 0 0 3px rgba(255, 106, 26, .25); }
.input-wrap input.has-toggle { padding-right: 3rem; }
.toggle {
    position: absolute; top: 50%; right: 8px; transform: translateY(-50%);
    width: 34px; height: 34px; border: 0; border-radius: 50%;
    background: transparent; color: var(--muted); cursor: pointer;
    display: grid; place-items: center;
}
.toggle:hover { color: var(--ink); background: #f1ece8; }
.toggle:focus-visible { outline: 2px solid var(--ember); }

.error {
    margin: 0 0 1.1rem; padding: .7rem 1rem; border-radius: 14px;
    background: #fdeceb; color: #a3202b; border: 1px solid #f1c3c0; font-size: 14px;
}

.submit {
    width: 100%; height: 50px; margin-top: .6rem;
    font: inherit; font-weight: 500; font-size: 16px; color: #fff;
    background: var(--black); border: 1px solid var(--black); border-radius: 999px; cursor: pointer;
    transition: background-color .15s, color .15s, box-shadow .15s;
}
.submit:hover { background: var(--ember); border-color: var(--ember); color: #000; box-shadow: 0 6px 22px rgba(255, 106, 26, .45); }
.submit:focus-visible { outline: 2px solid var(--ember); outline-offset: 3px; }

@media (prefers-reduced-motion: reduce) { .art .drift { animation: none; } }

@media (max-width: 767px) {
    body.login-page { padding: 14px; }
    .stage { grid-template-columns: 1fr; border-radius: 24px; }
    .art { min-height: 150px; }
    .art .mark { top: 50%; transform: translate(-50%, -50%); width: 46px; height: 46px; }
    .panel { padding: 28px 18px 24px; }
    .panel h1 { font-size: 34px; }
}

/* frame light alternates ember <-> violet */
@keyframes frameglow {
    0%, 100% {
        border-color: #ff6a1a;
        box-shadow: 0 0 18px rgba(255, 106, 26, .65), 0 0 70px rgba(255, 90, 0, .32), 0 24px 60px rgba(0, 0, 0, .55);
    }
    50% {
        border-color: #8b5cf6;
        box-shadow: 0 0 18px rgba(139, 92, 246, .7), 0 0 70px rgba(106, 47, 240, .38), 0 24px 60px rgba(0, 0, 0, .55);
    }
}
.stage { animation: frameglow 7s ease-in-out infinite; }
@media (prefers-reduced-motion: reduce) { .stage { animation: none; } }