:root {
    --panel-bg: #fbfbfe;
    --field-bg: #f2f3f8;
    --ink: #1f2937;
    --muted: #8d95a5;
    --status: #31507f;
    --border: #d8ddea;
    --border-strong: #cfd6e4;
    --success: #1e7a52;
    --danger: #b64232;
    --shadow: 0 18px 40px rgba(80, 94, 124, 0.12);
}

* {
    box-sizing: border-box;
}

body {
    margin: 0;
    height: 100svh;
    overflow: hidden;
    font-family: "Segoe UI", Tahoma, Geneva, Verdana, sans-serif;
    color: var(--ink);
    background: #edf3fb;
}

.login-shell {
    display: grid;
    grid-template-columns: 330px 1fr;
    height: 100svh;
    overflow: hidden;
}

.login-panel {
    display: flex;
    flex-direction: column;
    justify-content: center;
    padding: 56px 42px;
    background: var(--panel-bg);
    overflow: hidden;
}

.login-copy {
    max-width: 240px;
}

.brand-title {
    margin: 0;
    font-size: clamp(3rem, 4.6vw, 4.3rem);
    line-height: 0.9;
    letter-spacing: -0.05em;
    font-weight: 800;
}

.brand-title span {
    display: block;
}

.brand-description {
    margin: 18px 0 0;
    font-size: 17px;
    line-height: 1.35;
    color: #a4acba;
}

.signin-block h2 {
    margin: 0;
    font-size: 30px;
    line-height: 1;
    letter-spacing: -0.03em;
}

.status-message {
    min-height: 24px;
    margin: 10px 0 24px;
    color: var(--status);
    font-size: 15px;
}

.login-form {
    display: grid;
    gap: 18px;
}

input {
    width: 100%;
    height: 56px;
    padding: 0 20px;
    border: 1px solid #eaedf4;
    border-radius: 14px;
    background: var(--field-bg);
    color: var(--ink);
    font: inherit;
    font-size: 17px;
    box-shadow: inset 0 1px 0 rgba(255, 255, 255, 0.7);
}

input::placeholder {
    color: #a2a8b4;
}

input:focus {
    outline: none;
    border-color: var(--border-strong);
    box-shadow: 0 0 0 4px rgba(208, 216, 234, 0.35);
}

.password-row {
    position: relative;
}

.password-row input {
    padding-right: 56px;
}

.password-toggle {
    position: absolute;
    top: 50%;
    right: 12px;
    display: grid;
    place-items: center;
    width: 34px;
    height: 34px;
    border: 0;
    border-radius: 50%;
    background: transparent;
    transform: translateY(-50%);
    cursor: pointer;
    transition: background 140ms ease;
}

.password-toggle:hover {
    background: rgba(212, 217, 229, 0.45);
}

.eye-icon {
    position: relative;
    display: block;
    width: 18px;
    height: 10px;
    border: 2px solid #9aa1ae;
    border-radius: 999px;
}

.eye-icon::before {
    content: "";
    position: absolute;
    top: 50%;
    left: 50%;
    width: 4px;
    height: 4px;
    border-radius: 50%;
    background: #9aa1ae;
    transform: translate(-50%, -50%);
}

.password-toggle.is-visible .eye-icon::after {
    content: "";
    position: absolute;
    top: -4px;
    left: 7px;
    width: 2px;
    height: 16px;
    background: #9aa1ae;
    transform: rotate(45deg);
}

.arrow-button {
    display: grid;
    place-items: center;
    width: 84px;
    height: 84px;
    margin-top: 14px;
    border: 2px solid #d9dfea;
    border-radius: 24px;
    background: #fbfcff;
    box-shadow: var(--shadow);
    cursor: pointer;
    transition: transform 120ms ease, border-color 120ms ease, box-shadow 120ms ease;
}

.arrow-button:hover {
    transform: translateY(-1px);
    border-color: #cbd3e4;
    box-shadow: 0 16px 32px rgba(111, 126, 158, 0.16);
}

.arrow-button:active {
    transform: translateY(1px);
}

.arrow-icon {
    position: relative;
    display: block;
    width: 28px;
    height: 3px;
    border-radius: 999px;
    background: #d0d4dd;
}

.arrow-icon::before,
.arrow-icon::after {
    content: "";
    position: absolute;
    right: 0;
    width: 12px;
    height: 3px;
    border-radius: 999px;
    background: #d0d4dd;
}

.arrow-icon::before {
    top: -4px;
    transform: rotate(45deg);
}

.arrow-icon::after {
    top: 4px;
    transform: rotate(-45deg);
}

.world-panel {
    height: 100svh;
    background:
        linear-gradient(rgba(255, 255, 255, 0.16), rgba(255, 255, 255, 0.16)),
        url("assets/ui/login_world.png") center center / cover no-repeat;
}

.sr-only {
    position: absolute;
    width: 1px;
    height: 1px;
    padding: 0;
    margin: -1px;
    overflow: hidden;
    clip: rect(0, 0, 0, 0);
    white-space: nowrap;
    border: 0;
}

.status-message.success {
    color: var(--success);
}

.status-message.error {
    color: var(--danger);
}

@media (max-width: 900px) {
    body {
        height: auto;
        overflow: auto;
    }

    .login-shell {
        grid-template-columns: 1fr;
        height: auto;
    }

    .login-panel {
        justify-content: flex-start;
        padding: 48px 24px 32px;
    }

    .signin-block {
        margin-top: 36px;
    }

    .world-panel {
        min-height: 48vh;
    }
}