:root {
    /* Палитра КлинОтвет — вариант D (Bright Friendly) */
    --bg: #f5f6ff;
    --panel: #ffffff;
    --panel-border: #e7e9f5;
    --text: #15182b;
    --muted: #5b6076;
    --brand: #5b5bf0;
    --brand-strong: #4444d6;
    --brand-soft: #ecedff;
    --accent: #10b981;
    --danger: #dc2626;
}

* {
    box-sizing: border-box;
}

body {
    margin: 0;
    min-height: 100vh;
    font-family: Manrope, -apple-system, "Segoe UI", Roboto, Arial, sans-serif;
    color: var(--text);
    -webkit-font-smoothing: antialiased;
    background:
        radial-gradient(900px 500px at 12% -10%, rgba(255,255,255,.25), transparent 60%),
        linear-gradient(135deg, #5b5bf0 0%, #4444d6 100%);
}

.login-shell {
    min-height: 100vh;
    display: flex;
    align-items: center;
    justify-content: center;
    padding: 24px;
}

.login-panel {
    width: min(440px, 100%);
    padding: 40px 34px;
    border-radius: 24px;
    background: var(--panel);
    border: 1px solid var(--panel-border);
    box-shadow: 0 30px 80px rgba(36, 36, 120, 0.35);
}

.brand {
    display: inline-flex;
    align-items: center;
    gap: 10px;
    padding: 10px 16px;
    border-radius: 999px;
    font-weight: 800;
    color: var(--brand);
    background: var(--brand-soft);
    border: 1px solid var(--brand-soft);
}

h1 {
    margin: 24px 0 10px;
    font-size: 32px;
    font-weight: 800;
    letter-spacing: -0.6px;
}

.subtitle {
    margin: 0 0 26px;
    color: var(--muted);
    line-height: 1.55;
    font-weight: 500;
}

.login-form {
    display: grid;
    gap: 16px;
}

.login-form label {
    display: grid;
    gap: 8px;
}

.login-form span {
    color: var(--muted);
    font-size: 14px;
    font-weight: 700;
}

.login-form input {
    width: 100%;
    padding: 14px 16px;
    border: 1px solid var(--panel-border);
    border-radius: 14px;
    background: #fbfbff;
    color: var(--text);
    font-size: 16px;
    font-family: inherit;
    outline: none;
    transition: border-color .18s, box-shadow .18s;
}

.login-form input:focus {
    border-color: var(--brand);
    box-shadow: 0 0 0 4px rgba(91, 91, 240, 0.16);
    background: #fff;
}

#loginBtn {
    margin-top: 8px;
    border: none;
    border-radius: 14px;
    padding: 15px 18px;
    font-size: 16px;
    font-weight: 700;
    font-family: inherit;
    cursor: pointer;
    color: #fff;
    background: var(--brand);
    transition: background 0.18s, transform 0.05s;
}

#loginBtn:hover {
    background: var(--brand-strong);
}

#loginBtn:active {
    transform: scale(0.99);
}

#loginBtn:disabled {
    opacity: 0.7;
    cursor: wait;
}

.error-box {
    margin-top: 18px;
    padding: 12px 14px;
    border-radius: 12px;
    color: #b91c1c;
    background: #fef2f2;
    border: 1px solid #fecaca;
    font-weight: 500;
}

.hint {
    margin-top: 18px;
    color: var(--muted);
    font-size: 14px;
    line-height: 1.5;
    font-weight: 500;
}

.hint code {
    color: var(--brand);
    background: var(--brand-soft);
    padding: 1px 6px;
    border-radius: 6px;
}

@media (max-width: 640px) {
    .login-panel {
        padding: 28px 22px;
    }

    h1 {
        font-size: 28px;
    }
}