.auth-container {
    min-height: 100vh;
    display: grid;
    place-items: center;
    padding: 2rem;
}

.auth-container::before {
    content: "ZIPPYSHARE";
    position: fixed;
    left: 50%;
    top: 50%;
    z-index: 0;
    color: rgba(216, 180, 254, 0.045);
    font-size: clamp(4.5rem, 17vw, 15rem);
    font-weight: 700;
    letter-spacing: 0.08em;
    white-space: nowrap;
    transform: translate(-50%, -50%);
    pointer-events: none;
}

.auth-box {
    width: min(100%, 440px);
    padding: 2.25rem;
    border: 1px solid var(--border);
    border-radius: 8px;
    background:
        linear-gradient(160deg, rgba(183, 121, 255, 0.14), transparent 34%),
        var(--panel);
    box-shadow: 0 24px 80px var(--shadow), inset 0 1px 0 rgba(255, 255, 255, 0.08);
    backdrop-filter: blur(22px);
    animation: authEnter 0.8s var(--ease-out) both;
}

.auth-box h1 {
    margin-bottom: 1.75rem;
    text-align: left;
    font-size: clamp(2rem, 6vw, 3.15rem);
    line-height: 1;
}

.auth-box h1::after {
    content: "";
    display: block;
    width: 64px;
    height: 1px;
    margin-top: 1rem;
    background: linear-gradient(90deg, var(--white), transparent);
}

.auth-form {
    display: none;
}

.auth-form.active {
    display: block;
    animation: formSlide 0.52s var(--ease-out) both;
}

.form-group {
    margin-bottom: 1.2rem;
}

.auth-form.active .form-group {
    animation: riseIn 0.58s var(--ease-out) both;
}

.auth-form.active .form-group:nth-child(2) {
    animation-delay: 60ms;
}

.auth-form.active .form-group:nth-child(3) {
    animation-delay: 120ms;
}

.auth-form.active .form-group:nth-child(4) {
    animation-delay: 180ms;
}

.form-group label {
    display: block;
    margin-bottom: 0.45rem;
    color: var(--gray-soft);
    font-size: 0.82rem;
    letter-spacing: 0;
    text-transform: uppercase;
}

.form-group input {
    width: 100%;
    min-height: 46px;
    padding: 0.75rem 0.85rem;
    border: 1px solid var(--border);
    border-radius: 8px;
    background: rgba(13, 8, 20, 0.44);
    color: var(--white);
    font-size: 1rem;
    transition: border-color 0.25s ease, background 0.25s ease, box-shadow 0.25s ease, transform 0.25s var(--ease-spring);
}

.form-group input:hover {
    border-color: var(--border-strong);
}

.form-group input:focus {
    border-color: var(--white);
    background: rgba(17, 10, 26, 0.72);
    box-shadow: 0 0 0 4px rgba(183, 121, 255, 0.12);
    outline: none;
    transform: translateY(-1px);
}

.form-group small {
    display: block;
    margin-top: 0.35rem;
    color: var(--gray);
    font-size: 0.82rem;
}

.btn-submit {
    display: flex;
    align-items: center;
    justify-content: center;
    width: 100%;
    min-height: 50px;
    margin-top: 0.3rem;
    padding: 0.9rem 1rem;
    border-radius: 8px;
    font-size: 1rem;
    text-align: center;
    text-decoration: none;
}

.share-download-button.is-waiting {
    opacity: 0.58;
    cursor: wait;
    pointer-events: auto;
}

.download-fallback-link {
    display: block;
    margin-top: 0.85rem;
    color: var(--gray);
    text-align: center;
    text-decoration: none;
    transition: color 0.25s ease;
}

.download-fallback-link:hover {
    color: var(--white);
}

.auth-link {
    margin-top: 1.35rem;
    text-align: center;
}

.auth-link a {
    color: var(--gray);
    font-size: 0.92rem;
    text-decoration: none;
    transition: color 0.25s ease;
}

.auth-link a:hover {
    color: var(--white);
}

.back-link {
    display: block;
    margin-top: 2rem;
    color: var(--gray);
    text-align: center;
    text-decoration: none;
    transition: color 0.25s ease;
}

.back-link:hover {
    color: var(--white);
}

@keyframes authEnter {
    from {
        opacity: 0;
        transform: translateY(24px) scale(0.97);
    }

    to {
        opacity: 1;
        transform: translateY(0) scale(1);
    }
}

@keyframes formSlide {
    from {
        opacity: 0;
        transform: translateX(16px);
    }

    to {
        opacity: 1;
        transform: translateX(0);
    }
}

@media (max-width: 480px) {
    .auth-container {
        padding: 1rem;
    }

    .auth-box {
        padding: 1.5rem;
    }
}