.auth-section {
    background: var(--color-bg-card);
    backdrop-filter: blur(20px);
    border-radius: var(--radius-card);
    box-shadow: var(--shadow-card);
    overflow: hidden;
    animation: slideIn 0.4s ease-out;
}

@keyframes slideIn {
    from { opacity: 0; transform: translateY(24px); }
    to   { opacity: 1; transform: translateY(0); }
}

.form-container {
    padding: 40px 36px;
}

.form-tabs {
    display: flex;
    gap: 8px;
    margin-bottom: 28px;
    background: #f3f4f6;
    padding: 5px;
    border-radius: var(--radius-input);
}

.tab-btn {
    flex: 1;
    padding: 11px 16px;
    border: none;
    background: transparent;
    color: var(--color-text-muted);
    font: inherit;
    font-size: 14px;
    font-weight: 600;
    cursor: pointer;
    border-radius: 8px;
    transition: background 0.2s ease, color 0.2s ease, box-shadow 0.2s ease;
}

.tab-btn.active {
    background: white;
    color: var(--color-primary);
    box-shadow: 0 2px 6px rgba(0, 0, 0, 0.08);
}

.tab-btn:hover:not(.active) {
    color: var(--color-primary);
}

.auth-form { display: none; }
.auth-form.active { display: block; animation: fadeIn 0.3s ease-out; }

@keyframes fadeIn {
    from { opacity: 0; transform: translateY(6px); }
    to   { opacity: 1; transform: translateY(0); }
}

.auth-form h2 {
    margin-bottom: 22px;
    font-size: 22px;
    font-weight: 700;
    color: var(--color-text);
}

.form-group {
    margin-bottom: 18px;
}

.form-group label {
    display: block;
    margin-bottom: 6px;
    color: #374151;
    font-weight: 600;
    font-size: 13px;
    letter-spacing: 0.2px;
}

.form-group input {
    width: 100%;
    padding: 12px 14px;
    border: 1.5px solid var(--color-border);
    border-radius: var(--radius-input);
    font: inherit;
    font-size: 15px;
    background: white;
    transition: border-color 0.2s ease, box-shadow 0.2s ease, background 0.2s ease;
}

.form-group input:focus {
    outline: none;
    border-color: var(--color-primary);
    background: #fafbff;
    box-shadow: 0 0 0 3px rgba(102, 126, 234, 0.15);
}

.form-group input:invalid:not(:placeholder-shown) {
    border-color: #fca5a5;
}

.hint {
    margin-top: 6px;
    color: var(--color-text-muted);
    font-size: 12px;
}