:root {
    --auth-blue: #3b71ca;
    --auth-blue-hover: #2c5cb0;
    --auth-purple: #6f42c1;
    --auth-purple-dark: #5a32a3;
    --auth-card-radius: 16px;
    --auth-shadow: 0 20px 50px rgba(0, 0, 0, 0.18);
}

.duell-auth-page {
    margin: 0;
    min-height: 100vh;
    font-family: "Inter", "Segoe UI", system-ui, sans-serif;
    color: #1a1a1a;
    position: relative;
    overflow-x: hidden;
}

.duell-auth-bg {
    position: fixed;
    inset: 0;
    z-index: 0;
    background-color: #1a2744;
    background-image: url("https://images.unsplash.com/photo-1464822759023-fed622ff2c3b?auto=format&fit=crop&w=2400&q=80");
    background-size: cover;
    background-position: center 35%;
    transform: scale(1.02);
}

.duell-auth-overlay {
    position: fixed;
    inset: 0;
    z-index: 1;
    background: linear-gradient(
        160deg,
        rgba(15, 23, 42, 0.45) 0%,
        rgba(15, 23, 42, 0.25) 45%,
        rgba(30, 58, 95, 0.35) 100%
    );
    pointer-events: none;
}

.duell-auth-brand {
    position: fixed;
    top: 1.75rem;
    left: 2rem;
    z-index: 10;
}

.duell-auth-brand a {
    font-size: clamp(1rem, 2.5vw, 1.35rem);
    font-weight: 700;
    letter-spacing: 0.06em;
    color: #fff;
    text-decoration: none;
    text-shadow: 0 2px 12px rgba(0, 0, 0, 0.35);
}

.duell-auth-brand a:hover {
    color: #e2e8f0;
}

.duell-auth-main {
    position: relative;
    z-index: 5;
    min-height: 100vh;
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    padding: 5.5rem 1.25rem 2.5rem;
    box-sizing: border-box;
}

.duell-auth-flash {
    width: 100%;
    max-width: 440px;
    margin-bottom: 1rem;
}

.duell-auth-flash .message {
    padding: 0.75rem 1rem;
    border-radius: 10px;
    font-size: 0.9rem;
    box-shadow: 0 4px 16px rgba(0, 0, 0, 0.12);
}

.duell-auth-flash .message.error {
    background: #fef2f2;
    border: 1px solid #fecaca;
    color: #991b1b;
}

.duell-auth-flash .message.success {
    background: #f0fdf4;
    border: 1px solid #bbf7d0;
    color: #166534;
}

.auth-stack {
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 1rem;
    width: 100%;
    max-width: 440px;
}

.auth-card {
    width: 100%;
    background: #fff;
    border-radius: var(--auth-card-radius);
    box-shadow: var(--auth-shadow);
    padding: 2.25rem 2.5rem 1.75rem;
    box-sizing: border-box;
}

.auth-badge {
    display: inline-flex;
    align-items: center;
    gap: 0.4rem;
    margin: 0 auto 1.25rem;
    padding: 0.35rem 0.9rem;
    border-radius: 999px;
    background: linear-gradient(135deg, var(--auth-purple) 0%, var(--auth-purple-dark) 100%);
    color: #fff;
    font-size: 0.7rem;
    font-weight: 700;
    letter-spacing: 0.08em;
    width: fit-content;
    box-shadow: 0 4px 14px rgba(111, 66, 193, 0.35);
}

.auth-badge--register {
    background: linear-gradient(135deg, #5c6bc0 0%, var(--auth-purple) 100%);
}

.auth-badge__icon {
    font-size: 0.85rem;
    line-height: 1;
}

.auth-card .auth-badge {
    display: flex;
}

.auth-card__title {
    margin: 0 0 0.5rem;
    font-size: 1.65rem;
    font-weight: 700;
    color: #111827;
    text-align: center;
}

.auth-card__subtitle {
    margin: 0 0 1.65rem;
    font-size: 0.95rem;
    color: #6b7280;
    text-align: center;
    line-height: 1.5;
}

.auth-form .auth-field {
    margin-bottom: 1.15rem;
}

.auth-form .auth-field label {
    display: block;
    font-size: 0.9rem;
    font-weight: 700;
    color: #111827;
    margin-bottom: 0.4rem;
}

.auth-form .auth-field input[type="email"],
.auth-form .auth-field input[type="password"],
.auth-form .auth-field input[type="text"] {
    width: 100%;
    box-sizing: border-box;
    padding: 0.7rem 0.95rem;
    font-size: 0.95rem;
    border: 1px solid #d1d5db;
    border-radius: 8px;
    background: #fff;
    transition: border-color 0.15s, box-shadow 0.15s;
}

.auth-form .auth-field input:focus {
    outline: none;
    border-color: var(--auth-blue);
    box-shadow: 0 0 0 3px rgba(59, 113, 202, 0.2);
}

.auth-form .error-message {
    color: #b91c1c;
    font-size: 0.82rem;
    margin: 0.35rem 0 0;
}

.auth-btn-primary {
    display: block;
    width: 100%;
    margin-top: 0.5rem;
    padding: 0.85rem 1.25rem;
    font-size: 1rem;
    font-weight: 600;
    font-family: inherit;
    color: #fff !important;
    background: var(--auth-blue);
    border: none;
    border-radius: 10px;
    cursor: pointer;
    box-shadow: 0 4px 14px rgba(59, 113, 202, 0.35);
    transition: background 0.15s, transform 0.05s;
}

.auth-btn-primary:hover {
    background: var(--auth-blue-hover);
}

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

.auth-card__links {
    margin-top: 1.5rem;
    padding-top: 1.25rem;
    border-top: 1px solid #e5e7eb;
    text-align: center;
    font-size: 0.9rem;
    color: #4b5563;
}

.auth-card__links p {
    margin: 0.35rem 0;
}

.auth-inline-link {
    color: var(--auth-blue);
    font-weight: 600;
    text-decoration: none;
}

.auth-inline-link:hover {
    text-decoration: underline;
    color: var(--auth-blue-hover);
}

.auth-card__back {
    margin: 1.25rem 0 0;
    text-align: center;
    font-size: 0.85rem;
}

.auth-muted-link {
    color: #9ca3af;
    text-decoration: none;
}

.auth-muted-link:hover {
    color: #6b7280;
    text-decoration: underline;
}

@media (max-width: 480px) {
    .duell-auth-brand {
        left: 1.25rem;
        top: 1.25rem;
    }

    .auth-card {
        padding: 1.75rem 1.35rem 1.5rem;
    }
}