.auth-wrapper {
    min-height: 100vh;
    display: flex;
    align-items: center;
    justify-content: center;
    padding: 2rem;
}

.auth-card {
    width: 100%;
    max-width: 440px;
    background: linear-gradient(160deg, var(--surface-2), var(--surface-1));
    border: 1px solid var(--border);
    border-radius: var(--radius-xl);
    padding: clamp(2rem, 5vw, 2.75rem);
    backdrop-filter: blur(24px);
    -webkit-backdrop-filter: blur(24px);
    box-shadow: var(--shadow-xl), var(--shadow-inset);
}

.auth-logo {
    text-align: center;
    margin-bottom: 2rem;
}
.auth-logo img {
    height: 48px;
}

.auth-tabs {
    display: flex;
    background: var(--surface-2);
    border: 1px solid var(--border);
    border-radius: var(--radius-md);
    padding: 4px;
    margin-bottom: 2rem;
    gap: 4px;
}
.auth-tab {
    flex: 1;
    padding: 0.65rem 1rem;
    border: none;
    background: transparent;
    color: var(--text-muted);
    border-radius: var(--radius-sm);
    cursor: pointer;
    font-family: var(--font-body);
    font-size: 0.9rem;
    font-weight: 500;
    transition: color var(--dur) var(--ease), background var(--dur) var(--ease);
}
.auth-tab.active {
    background: var(--surface-3);
    color: var(--text-main);
    box-shadow: var(--shadow-sm);
}
.auth-tab:not(.active):hover {
    color: var(--text-main);
    background: var(--surface-1);
}

.auth-form {
    display: none;
    flex-direction: column;
    gap: 1.2rem;
}
.auth-form.active {
    display: flex;
}

.form-group {
    display: flex;
    flex-direction: column;
    gap: 0.4rem;
}
.form-group label {
    font-size: 0.82rem;
    color: var(--text-muted);
    font-family: var(--font-body);
    letter-spacing: 0.02em;
}

.input-wrapper {
    position: relative;
    display: flex;
    align-items: center;
}
.input-wrapper > i.input-icon {
    position: absolute;
    left: 1rem;
    color: var(--text-muted);
    font-size: 0.85rem;
    pointer-events: none;
    z-index: 1;
}
.input-wrapper input {
    width: 100%;
    padding: 0.9rem 3rem 0.9rem 2.75rem;
    background: var(--surface-2);
    border: 1px solid var(--border);
    border-radius: var(--radius-sm);
    color: var(--text-main);
    font-family: var(--font-body);
    font-size: 0.95rem;
    transition: border-color var(--dur) var(--ease), background var(--dur) var(--ease), box-shadow var(--dur) var(--ease);
    outline: none;
}
.input-wrapper input:focus {
    border-color: rgba(255, 255, 255, 0.45);
    background: var(--surface-3);
    box-shadow: 0 0 0 3px rgba(230, 232, 236, 0.08);
}
.input-wrapper input::placeholder {
    color: var(--text-faint);
}
.toggle-pw {
    position: absolute;
    right: 0.9rem;
    background: none;
    border: none;
    color: var(--text-muted);
    cursor: pointer;
    padding: 4px;
    font-size: 0.82rem;
    transition: color 0.25s;
    line-height: 1;
}
.toggle-pw:hover { color: var(--text-main); }

.auth-message {
    display: none;
    padding: 0.75rem 1rem;
    border-radius: 10px;
    font-size: 0.85rem;
    font-family: var(--font-body);
}
.auth-message.error {
    background: rgba(239, 68, 68, 0.1);
    border: 1px solid rgba(239, 68, 68, 0.25);
    color: #f87171;
}
.auth-message.success {
    background: rgba(34, 197, 94, 0.1);
    border: 1px solid rgba(34, 197, 94, 0.25);
    color: #4ade80;
}
.auth-message.visible { display: block; }

.btn-auth {
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 0.5rem;
    width: 100%;
    padding: 0.95rem 1.5rem;
    background: var(--chrome-grad);
    border: 1px solid rgba(255, 255, 255, 0.7);
    border-radius: var(--radius-xs);
    color: #0a0b0d;
    font-family: var(--font-body);
    font-size: 1rem;
    font-weight: 700;
    cursor: pointer;
    transition: transform var(--dur) var(--ease), box-shadow var(--dur) var(--ease);
    margin-top: 0.4rem;
    position: relative;
    overflow: hidden;
    box-shadow: var(--shadow-md), inset 0 1px 0 rgba(255, 255, 255, 0.6);
}
.btn-auth::before {
    content: '';
    position: absolute;
    top: 0; left: -120%; width: 60%; height: 100%;
    background: linear-gradient(100deg, transparent, rgba(255, 255, 255, 0.4), transparent);
    transition: left var(--dur-slow) var(--ease);
}
.btn-auth:hover::before { left: 130%; }
.btn-auth:hover { transform: translateY(-2px); box-shadow: var(--shadow-lg), inset 0 1px 0 rgba(255, 255, 255, 0.7); }
.btn-auth:active { transform: translateY(0); }
.btn-auth:focus-visible { outline: 2px solid var(--platinum); outline-offset: 3px; }
.btn-auth:disabled {
    opacity: 0.5;
    cursor: not-allowed;
    transform: none;
    box-shadow: none;
}

.btn-auth .btn-spinner {
    display: none;
    width: 16px;
    height: 16px;
    border: 2px solid rgba(10, 11, 13, 0.25);
    border-top-color: #0a0b0d;
    border-radius: 50%;
    animation: authSpin 0.75s linear infinite;
    flex-shrink: 0;
}
.btn-auth.loading .btn-spinner { display: block; }
.btn-auth.loading .btn-label,
.btn-auth.loading .btn-icon { display: none; }

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

@media (max-width: 480px) {
    .auth-card { padding: 1.75rem 1.5rem; border-radius: 20px; }
}