:root {
    --bg-base: #0b3a56;
    --bg-deep: #06202f;
    --bg-1: rgba(16, 124, 145, .9);
    --bg-2: rgba(35, 166, 213, .45);
    --bg-3: rgba(35, 213, 171, .16);
    --art-line: rgba(255, 255, 255, .15);
    --art-facet: rgba(255, 255, 255, .08);
    --art-accent: rgba(232, 35, 44, .75);
    --art-1: #0e4b75;
    --art-2: #107c91;
    --art-3: #23a6d5;
    --ink: #14303f;
    --ink-soft: #5b7281;
    --line: #d5e0e7;
    --surface: #ffffff;
    --surface-soft: #f4f8fa;
    --brand-deep: #0e4b75;
    --brand: #107c91;
    --brand-bright: #23a6d5;
    --brand-mint: #23d5ab;
    --danger: #b4532a;
}

*, *::before, *::after { box-sizing: border-box; }

body {
    margin: 0;
    min-height: 100vh;
    min-height: 100dvh;
    display: flex;
    align-items: center;
    justify-content: center;
    padding: 24px;
    color: var(--ink);
    font-family: "Segoe UI", system-ui, -apple-system, Roboto, "Helvetica Neue", Arial, sans-serif;
    font-size: 15px;
    line-height: 1.5;
    background-color: var(--bg-base);
    background-image:
        radial-gradient(60% 75% at 12% 18%, var(--bg-1) 0%, transparent 70%),
        radial-gradient(55% 70% at 92% 88%, var(--bg-2) 0%, transparent 70%),
        linear-gradient(135deg, var(--bg-base), var(--bg-deep));
    background-attachment: fixed;
    overflow-x: hidden;
}

/* --- SENI LATAR --- */

body::before {
    content: "";
    position: fixed;
    inset: -20%;
    z-index: 0;
    pointer-events: none;
    background:
        radial-gradient(28% 34% at 72% 26%, var(--bg-3) 0%, transparent 72%),
        radial-gradient(24% 30% at 30% 74%, var(--bg-3) 0%, transparent 72%);
    animation: login-drift 34s ease-in-out infinite alternate;
}

@keyframes login-drift {
    from { transform: translate3d(-5%, -3%, 0) scale(1); }
    to { transform: translate3d(5%, 4%, 0) scale(1.12); }
}

.login-bg-art {
    position: fixed;
    inset: 0;
    z-index: 0;
    width: 100%;
    height: 100%;
    pointer-events: none;
}

.art-dots { opacity: .5; }
.login-bg-art pattern circle { fill: var(--art-line); }

.art-waves path {
    fill: none;
    stroke: var(--art-line);
    stroke-width: 1.5;
}

.art-waves { animation: login-sway 22s ease-in-out infinite alternate; }

@keyframes login-sway {
    from { transform: translateX(-26px); }
    to { transform: translateX(26px); }
}

.art-frame path {
    fill: none;
    stroke: var(--art-line);
    stroke-width: 2;
}

.art-facet { fill: var(--art-facet); }
.art-facet-soft { opacity: .55; }

.art-float { animation: login-float 16s ease-in-out infinite alternate; }

@keyframes login-float {
    from { transform: translateY(-12px); }
    to { transform: translateY(14px); }
}

.art-spark { fill: var(--art-facet); }
.art-spark-accent { fill: var(--art-accent); }

/* --- KERANGKA --- */

.login-shell {
    position: relative;
    z-index: 1;
    width: 100%;
    max-width: 1000px;
    display: grid;
    grid-template-columns: 1fr 1fr;
    border-radius: 20px;
    overflow: hidden;
    background: var(--surface);
    box-shadow: 0 30px 60px -20px rgba(4, 28, 43, .65);
}

/* --- PANEL LOGO --- */

.login-brand {
    position: relative;
    isolation: isolate;
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    padding: 36px;
    border-left: 1px solid var(--line);
    text-align: center;
    background: linear-gradient(160deg, #fff 55%, var(--surface-soft));
}

.login-brand-art {
    position: absolute;
    inset: 0;
    z-index: -1;
    width: 100%;
    height: 100%;
}

.panel-dots { opacity: .55; }
.login-brand-art pattern circle { fill: var(--art-2); }
.panel-line { fill: none; stroke: var(--art-2); stroke-opacity: .16; stroke-width: 1.5; }
.panel-f1 { fill: var(--art-1); }
.panel-f2 { fill: var(--art-2); opacity: .6; }
.panel-f3 { fill: var(--art-3); opacity: .75; }
.panel-accent { fill: var(--art-accent); }

/* Latar logo yang putih menyatu dengan panel, jadi tidak muncul kotak di atas art. */
.login-brand-logo {
    display: block;
    width: 100%;
    max-width: 400px;
    height: auto;
    mix-blend-mode: multiply;
}

.login-brand-title {
    margin: 26px 0 10px;
    color: var(--ink);
    font-size: 20px;
    font-weight: 700;
    letter-spacing: .08em;
}

.login-brand-list {
    display: flex;
    flex-wrap: wrap;
    justify-content: center;
    gap: 4px 18px;
    margin: 0;
    padding: 0;
    list-style: none;
    color: var(--ink-soft);
    font-size: 13px;
}

.login-brand-list i {
    margin-right: 4px;
    color: var(--brand);
}

/* --- PANEL FORM --- */

.login-panel { padding: 36px 44px 24px; }

.login-head { margin-bottom: 22px; }
.login-head img { display: none; }
.login-head-label { display: none; }

.login-head h1 {
    margin: 0;
    font-size: 24px;
    font-weight: 700;
    letter-spacing: -.01em;
}

.login-head-sub {
    margin: 2px 0 0;
    color: var(--ink-soft);
    font-size: 14px;
}

.field { margin-bottom: 16px; }

.field label {
    display: block;
    margin-bottom: 6px;
    font-size: 13px;
    font-weight: 600;
}

.field-control { position: relative; }

.field-control > i {
    position: absolute;
    top: 50%;
    left: 15px;
    transform: translateY(-50%);
    color: #8ba0ad;
    font-size: 14px;
    pointer-events: none;
    transition: color .15s;
}

.field-control input {
    width: 100%;
    height: 46px;
    padding: 0 44px 0 42px;
    border: 1px solid var(--line);
    border-radius: 10px;
    outline: none;
    color: var(--ink);
    font: inherit;
    background: var(--surface-soft);
    transition: border-color .15s, box-shadow .15s, background-color .15s;
}

.field-control input::placeholder { color: #93a6b2; }

.field-control input:focus {
    border-color: var(--brand);
    background: var(--surface);
    box-shadow: 0 0 0 3px rgba(16, 124, 145, .18);
}

.field-control input:focus ~ i,
.field-control:focus-within > i { color: var(--brand); }

.field-action {
    position: absolute;
    top: 3px;
    right: 3px;
    width: 40px;
    height: 40px;
    border: 0;
    border-radius: 8px;
    color: #6f8795;
    background: transparent;
    cursor: pointer;
}

.field-action:hover { color: var(--brand-deep); background: #e7eff3; }

.field-hint {
    margin: 6px 0 0;
    color: var(--danger);
    font-size: 12.5px;
}

/* --- CAPTCHA --- */

.captcha-row {
    display: flex;
    gap: 8px;
    margin-bottom: 8px;
}

.captcha-image {
    flex: 1 1 auto;
    min-width: 0;
    height: 56px;
    border: 1px solid var(--line);
    border-radius: 10px;
    object-fit: contain;
    background: #eef4f8;
    user-select: none;
}

.captcha-refresh {
    flex: 0 0 56px;
    border: 1px solid var(--line);
    border-radius: 10px;
    color: var(--brand-deep);
    background: var(--surface);
    cursor: pointer;
    transition: background-color .15s;
}

.captcha-refresh:hover { background: #e7eff3; }
.captcha-refresh.is-spinning i { animation: login-spin .5s linear; }

@keyframes login-spin { to { transform: rotate(360deg); } }

#captcha { letter-spacing: .18em; text-transform: uppercase; }
#captcha::placeholder { letter-spacing: normal; text-transform: none; }

/* --- TOMBOL --- */

.login-submit {
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 10px;
    width: 100%;
    height: 48px;
    margin-top: 22px;
    border: 0;
    border-radius: 10px;
    color: #fff;
    font: inherit;
    font-weight: 600;
    letter-spacing: .06em;
    background: var(--brand-deep);
    cursor: pointer;
    transition: background-color .15s, transform .15s;
}

.login-submit:hover { background: var(--brand); }
.login-submit:active { transform: translateY(1px); }
.login-submit.is-loading { opacity: .75; pointer-events: none; }

.field-action:focus-visible,
.captcha-refresh:focus-visible,
.login-submit:focus-visible {
    outline: 3px solid rgba(35, 166, 213, .55);
    outline-offset: 2px;
}

.login-foot {
    margin-top: 20px;
    color: var(--ink-soft);
    font-size: 12px;
    text-align: center;
}

/* --- LAYAR KECIL --- */

@media (max-width: 760px) {
    body { padding: 16px; align-items: flex-start; }
    .login-shell { grid-template-columns: 1fr; max-width: 440px; margin: auto; }
    .login-brand { display: none; }
    .login-panel { padding: 28px 24px 20px; }
    .login-head { text-align: center; }
    .login-head img { display: block; width: 100%; max-width: 200px; height: auto; margin: 0 auto 8px; }
    .login-head-label {
        display: block;
        margin: 0 0 16px;
        color: var(--brand);
        font-size: 12px;
        font-weight: 600;
        letter-spacing: .12em;
    }
}

@media (prefers-reduced-motion: reduce) {
    body::before, .art-waves, .art-float { animation: none; }
    .captcha-refresh.is-spinning i { animation: none; }
}