:root {
    --brand-hue: 222;
    --accent: hsl(var(--brand-hue) 83% 53%);
    --accent-strong: hsl(var(--brand-hue) 78% 45%);
    --accent-soft: hsl(var(--brand-hue) 90% 96%);
    --accent-ring: hsl(var(--brand-hue) 83% 53% / .28);
    --hero-bg: hsl(var(--brand-hue) 70% 30%);
    --hero-bg-2: hsl(calc(var(--brand-hue) + 26) 72% 46%);
    --hero-fg: #fff;

    --bg: #f5f7fb;
    --surface: #ffffff;
    --border: #e2e6ee;
    --text: #0f172a;
    --text-muted: #5b6577;
    --text-faint: #8a93a6;
    --danger: #c0392b;
    --danger-bg: #fdecea;
    --danger-border: #f5b8b1;
    --warn: #8a5a00;
    --warn-bg: #fff6df;
    --success: #1e8e3e;
    --success-bg: #e7f6ec;
    --shadow: 0 1px 2px rgb(15 23 42 / .06), 0 12px 32px -12px rgb(15 23 42 / .18);
    --radius: 14px;
    --radius-sm: 9px;
    --font: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "Helvetica Neue", Arial, "Noto Sans", sans-serif;
    color-scheme: light dark;
}

@media (prefers-color-scheme: dark) {
    :root {
        --accent: hsl(var(--brand-hue) 86% 62%);
        --accent-strong: hsl(var(--brand-hue) 80% 54%);
        --accent-soft: hsl(var(--brand-hue) 50% 18%);
        --accent-ring: hsl(var(--brand-hue) 86% 62% / .32);
        --hero-bg: hsl(var(--brand-hue) 60% 14%);
        --hero-bg-2: hsl(calc(var(--brand-hue) + 26) 60% 26%);

        --bg: #0d1220;
        --surface: #141a2b;
        --border: #262f45;
        --text: #e8ecf5;
        --text-muted: #a3adc2;
        --text-faint: #6f7a92;
        --danger: #ff8a80;
        --danger-bg: #3a1b1b;
        --danger-border: #5f2a2a;
        --warn: #f0c060;
        --warn-bg: #3a2e14;
        --success: #6fd393;
        --success-bg: #163224;
        --shadow: 0 1px 2px rgb(0 0 0 / .4), 0 16px 40px -16px rgb(0 0 0 / .7);
    }
}

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

html, body { height: 100%; }

body {
    margin: 0;
    font-family: var(--font);
    font-size: 15px;
    line-height: 1.5;
    color: var(--text);
    background: var(--bg);
    -webkit-font-smoothing: antialiased;
    text-rendering: optimizeLegibility;
}

a { color: inherit; }

svg { fill: currentColor; }

.noscript {
    background: var(--warn-bg);
    color: var(--warn);
    text-align: center;
    padding: 10px 16px;
    font-size: 14px;
}

/* ---------- layout ---------- */

.page {
    min-height: 100%;
    display: grid;
    grid-template-columns: minmax(0, 1.05fr) minmax(0, 1fr);
}

.hero {
    position: relative;
    color: var(--hero-fg);
    background:
        radial-gradient(1200px 600px at 10% -10%, hsl(var(--brand-hue) 80% 60% / .35), transparent 60%),
        radial-gradient(800px 500px at 100% 110%, hsl(calc(var(--brand-hue) + 40) 80% 55% / .35), transparent 60%),
        linear-gradient(160deg, var(--hero-bg), var(--hero-bg-2));
    overflow: hidden;
}

.hero::after {
    content: "";
    position: absolute;
    inset: 0;
    background-image:
        linear-gradient(rgb(255 255 255 / .05) 1px, transparent 1px),
        linear-gradient(90deg, rgb(255 255 255 / .05) 1px, transparent 1px);
    background-size: 48px 48px;
    mask-image: radial-gradient(70% 70% at 50% 50%, #000 40%, transparent 100%);
    pointer-events: none;
}

.hero__inner {
    position: relative;
    z-index: 1;
    max-width: 560px;
    margin: 0 auto;
    padding: 56px 48px;
    display: flex;
    flex-direction: column;
    justify-content: center;
    min-height: 100%;
}

.hero__title {
    font-size: clamp(30px, 3.2vw, 42px);
    line-height: 1.12;
    letter-spacing: -.02em;
    margin: 56px 0 16px;
    font-weight: 700;
}

.hero__lead {
    font-size: 17px;
    color: rgb(255 255 255 / .8);
    margin: 0 0 40px;
    max-width: 46ch;
}

.features {
    list-style: none;
    padding: 0;
    margin: 0 0 44px;
    display: grid;
    gap: 18px;
}

.features li {
    display: flex;
    gap: 14px;
    align-items: flex-start;
}

.features svg {
    flex: none;
    width: 22px;
    height: 22px;
    margin-top: 2px;
    color: rgb(255 255 255 / .9);
}

.features strong {
    display: block;
    font-weight: 600;
}

.features span {
    color: rgb(255 255 255 / .72);
    font-size: 14px;
}

.stats {
    display: grid;
    grid-template-columns: repeat(3, auto);
    gap: 28px;
    margin: 0;
    padding-top: 28px;
    border-top: 1px solid rgb(255 255 255 / .18);
}

.stats dt {
    font-size: 12px;
    text-transform: uppercase;
    letter-spacing: .06em;
    color: rgb(255 255 255 / .6);
}

.stats dd {
    margin: 4px 0 0;
    font-size: 20px;
    font-weight: 600;
    font-variant-numeric: tabular-nums;
}

/* ---------- brand ---------- */

.brand {
    display: inline-flex;
    align-items: center;
    gap: 10px;
    text-decoration: none;
    font-weight: 700;
    font-size: 18px;
    letter-spacing: -.01em;
}

.brand__mark {
    display: inline-flex;
    color: currentColor;
}

.brand--compact { color: var(--accent); }
.brand--compact .brand__name { color: var(--text); }

/* ---------- right panel ---------- */

.panel {
    display: flex;
    flex-direction: column;
    min-height: 100vh;
    padding: 24px 28px;
}

.panel__top {
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: 16px;
}

.panel__body {
    flex: 1;
    display: flex;
    align-items: center;
    justify-content: center;
    padding: 40px 0;
}

.lang {
    display: inline-flex;
    padding: 3px;
    border: 1px solid var(--border);
    border-radius: 999px;
    background: var(--surface);
}

.lang__btn {
    appearance: none;
    border: 0;
    background: transparent;
    color: var(--text-muted);
    font: inherit;
    font-size: 12px;
    font-weight: 600;
    letter-spacing: .04em;
    padding: 5px 11px;
    border-radius: 999px;
    cursor: pointer;
}

.lang__btn[aria-pressed="true"] {
    background: var(--accent);
    color: #fff;
}

/* ---------- card ---------- */

.card {
    width: 100%;
    max-width: 420px;
    background: var(--surface);
    border: 1px solid var(--border);
    border-radius: var(--radius);
    box-shadow: var(--shadow);
    padding: 32px 32px 28px;
}

.card--center { text-align: center; }

.card__title {
    margin: 0 0 6px;
    font-size: 24px;
    letter-spacing: -.02em;
    font-weight: 700;
}

.card__subtitle {
    margin: 0 0 22px;
    color: var(--text-muted);
}

.card__footnote {
    margin: 22px 0 0;
    font-size: 13px;
    color: var(--text-faint);
    text-align: center;
}

.back {
    display: inline-flex;
    align-items: center;
    gap: 6px;
    margin-bottom: 18px;
    font-size: 14px;
}

.back svg { width: 18px; height: 18px; }

.card--center .back { justify-content: center; }

.success-icon {
    width: 56px;
    height: 56px;
    margin: 4px auto 16px;
    border-radius: 50%;
    background: var(--success-bg);
    color: var(--success);
    display: grid;
    place-items: center;
}

.success-icon svg { width: 28px; height: 28px; }

/* ---------- form ---------- */

.field { margin-bottom: 16px; }

.field label,
.field__row label {
    display: block;
    font-size: 13.5px;
    font-weight: 600;
    margin-bottom: 6px;
    color: var(--text);
}

.field__row {
    display: flex;
    align-items: baseline;
    justify-content: space-between;
    gap: 12px;
}

.field__row .link { font-size: 13px; }

input[type="text"],
input[type="email"],
input[type="password"] {
    width: 100%;
    font: inherit;
    color: var(--text);
    background: var(--surface);
    border: 1px solid var(--border);
    border-radius: var(--radius-sm);
    padding: 11px 13px;
    outline: none;
    transition: border-color .15s, box-shadow .15s;
}

input::placeholder { color: var(--text-faint); }

input:focus {
    border-color: var(--accent);
    box-shadow: 0 0 0 4px var(--accent-ring);
}

.field.is-invalid input {
    border-color: var(--danger);
}

.field.is-invalid input:focus {
    box-shadow: 0 0 0 4px rgb(192 57 43 / .18);
}

.input-group { position: relative; }

.input-group input { padding-right: 46px; }

.input-group__btn {
    position: absolute;
    top: 50%;
    right: 6px;
    transform: translateY(-50%);
    width: 34px;
    height: 34px;
    border: 0;
    border-radius: 7px;
    background: transparent;
    color: var(--text-faint);
    cursor: pointer;
    display: grid;
    place-items: center;
}

.input-group__btn:hover { color: var(--text); background: var(--bg); }
.input-group__btn svg { width: 20px; height: 20px; }
.input-group__btn .icon-eye-off { display: none; }
.input-group__btn[aria-pressed="true"] .icon-eye { display: none; }
.input-group__btn[aria-pressed="true"] .icon-eye-off { display: block; }

.field__hint {
    margin: 6px 0 0;
    font-size: 12.5px;
}

.field__hint--error { color: var(--danger); }
.field__hint--warn { color: var(--warn); }

.check {
    display: flex;
    align-items: center;
    gap: 9px;
    font-size: 14px;
    color: var(--text-muted);
    margin: 4px 0 20px;
    cursor: pointer;
    user-select: none;
}

.check input {
    width: 16px;
    height: 16px;
    accent-color: var(--accent);
    margin: 0;
}

/* ---------- buttons ---------- */

.btn {
    position: relative;
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: 10px;
    width: 100%;
    font: inherit;
    font-weight: 600;
    padding: 11px 16px;
    border-radius: var(--radius-sm);
    border: 1px solid transparent;
    cursor: pointer;
    text-decoration: none;
    transition: background-color .15s, border-color .15s, opacity .15s, transform .05s;
}

.btn:active { transform: translateY(1px); }

.btn:focus-visible {
    outline: none;
    box-shadow: 0 0 0 4px var(--accent-ring);
}

.btn--primary {
    background: var(--accent);
    color: #fff;
}

.btn--primary:hover { background: var(--accent-strong); }

.btn--ghost {
    background: transparent;
    color: var(--text);
    border-color: var(--border);
}

.btn--ghost:hover { background: var(--bg); }
.btn--ghost svg { width: 18px; height: 18px; color: var(--text-muted); }

.btn[disabled] {
    opacity: .7;
    cursor: not-allowed;
}

.btn__spinner {
    display: none;
    width: 16px;
    height: 16px;
    border-radius: 50%;
    border: 2px solid rgb(255 255 255 / .35);
    border-top-color: #fff;
    animation: spin .7s linear infinite;
}

.btn.is-loading .btn__label { opacity: .85; }
.btn.is-loading .btn__spinner { display: inline-block; }

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

.divider {
    display: flex;
    align-items: center;
    gap: 12px;
    margin: 20px 0;
    color: var(--text-faint);
    font-size: 12px;
    text-transform: uppercase;
    letter-spacing: .08em;
}

.divider::before,
.divider::after {
    content: "";
    flex: 1;
    height: 1px;
    background: var(--border);
}

/* ---------- alerts ---------- */

.alert {
    display: flex;
    gap: 10px;
    align-items: flex-start;
    padding: 11px 13px;
    border-radius: var(--radius-sm);
    font-size: 14px;
    margin-bottom: 18px;
}

.alert svg { flex: none; width: 18px; height: 18px; margin-top: 2px; }

.alert--error {
    background: var(--danger-bg);
    border: 1px solid var(--danger-border);
    color: var(--danger);
}

.alert[hidden] { display: none; }

.shake { animation: shake .35s ease-in-out; }

@keyframes shake {
    0%, 100% { transform: translateX(0); }
    20%, 60% { transform: translateX(-5px); }
    40%, 80% { transform: translateX(5px); }
}

/* ---------- links & footer ---------- */

.link {
    color: var(--accent);
    text-decoration: none;
    font-weight: 500;
}

.link:hover { text-decoration: underline; }

.link--muted {
    color: var(--text-faint);
    font-weight: 400;
}

.panel__footer {
    display: flex;
    flex-wrap: wrap;
    justify-content: space-between;
    gap: 10px 20px;
    font-size: 12.5px;
    color: var(--text-faint);
}

.footer__links { display: flex; gap: 18px; }

.footer__meta { display: flex; gap: 14px; align-items: center; }

.footer__version {
    font-family: ui-monospace, SFMono-Regular, Menlo, Consolas, monospace;
    font-size: 11.5px;
    padding: 1px 7px;
    border: 1px solid var(--border);
    border-radius: 999px;
}

/* ---------- responsive ---------- */

@media (max-width: 960px) {
    .page { grid-template-columns: 1fr; }
    .hero { display: none; }
    .panel { min-height: 100vh; }
}

@media (max-width: 480px) {
    .panel { padding: 16px; }
    .card { padding: 24px 20px 22px; border-radius: 12px; }
    .card__title { font-size: 22px; }
    .panel__footer { flex-direction: column; align-items: center; text-align: center; }
    .footer__links { flex-wrap: wrap; justify-content: center; gap: 12px 16px; }
}

@media (prefers-reduced-motion: reduce) {
    *, *::before, *::after { animation-duration: .01ms !important; transition-duration: .01ms !important; }
}